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x86emu.c
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Editing: x86emu.c
/* $OpenBSD: x86emu.c,v 1.9 2014/06/15 11:04:49 pirofti Exp $ */ /* $NetBSD: x86emu.c,v 1.7 2009/02/03 19:26:29 joerg Exp $ */ /* * * Realmode X86 Emulator Library * * Copyright (C) 1996-1999 SciTech Software, Inc. * Copyright (C) David Mosberger-Tang * Copyright (C) 1999 Egbert Eich * Copyright (C) 2007 Joerg Sonnenberger * * ======================================================================== * * Permission to use, copy, modify, distribute, and sell this software and * its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and that * both that copyright notice and this permission notice appear in * supporting documentation, and that the name of the authors not be used * in advertising or publicity pertaining to distribution of the software * without specific, written prior permission. The authors makes no * representations about the suitability of this software for any purpose. * It is provided "as is" without express or implied warranty. * * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. * */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <contrib/x86emu/x86emu.h> #include <contrib/x86emu/x86emu_regs.h> static void x86emu_intr_raise (struct x86emu *, uint8_t type); static void x86emu_exec_one_byte(struct x86emu *); static void x86emu_exec_two_byte(struct x86emu *); static void fetch_decode_modrm (struct x86emu *); static uint8_t fetch_byte_imm (struct x86emu *); static uint16_t fetch_word_imm (struct x86emu *); static uint32_t fetch_long_imm (struct x86emu *); static uint8_t fetch_data_byte (struct x86emu *, uint32_t offset); static uint8_t fetch_byte (struct x86emu *, u_int segment, uint32_t offset); static uint16_t fetch_data_word (struct x86emu *, uint32_t offset); static uint16_t fetch_word (struct x86emu *, uint32_t segment, uint32_t offset); static uint32_t fetch_data_long (struct x86emu *, uint32_t offset); static uint32_t fetch_long (struct x86emu *, uint32_t segment, uint32_t offset); static void store_data_byte (struct x86emu *, uint32_t offset, uint8_t val); static void store_byte (struct x86emu *, uint32_t segment, uint32_t offset, uint8_t val); static void store_data_word (struct x86emu *, uint32_t offset, uint16_t val); static void store_word (struct x86emu *, uint32_t segment, uint32_t offset, uint16_t val); static void store_data_long (struct x86emu *, uint32_t offset, uint32_t val); static void store_long (struct x86emu *, uint32_t segment, uint32_t offset, uint32_t val); static uint8_t* decode_rl_byte_register(struct x86emu *); static uint16_t* decode_rl_word_register(struct x86emu *); static uint32_t* decode_rl_long_register(struct x86emu *); static uint8_t* decode_rh_byte_register(struct x86emu *); static uint16_t* decode_rh_word_register(struct x86emu *); static uint32_t* decode_rh_long_register(struct x86emu *); static uint16_t* decode_rh_seg_register(struct x86emu *); static uint32_t decode_rl_address(struct x86emu *); static uint8_t decode_and_fetch_byte(struct x86emu *); static uint16_t decode_and_fetch_word(struct x86emu *); static uint32_t decode_and_fetch_long(struct x86emu *); static uint8_t decode_and_fetch_byte_imm8(struct x86emu *, uint8_t *); static uint16_t decode_and_fetch_word_imm8(struct x86emu *, uint8_t *); static uint32_t decode_and_fetch_long_imm8(struct x86emu *, uint8_t *); static uint16_t decode_and_fetch_word_disp(struct x86emu *, int16_t); static uint32_t decode_and_fetch_long_disp(struct x86emu *, int16_t); static void write_back_byte(struct x86emu *, uint8_t); static void write_back_word(struct x86emu *, uint16_t); static void write_back_long(struct x86emu *, uint32_t); static uint16_t aaa_word (struct x86emu *, uint16_t d); static uint16_t aas_word (struct x86emu *, uint16_t d); static uint16_t aad_word (struct x86emu *, uint16_t d); static uint16_t aam_word (struct x86emu *, uint8_t d); static uint8_t adc_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t adc_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t adc_long (struct x86emu *, uint32_t d, uint32_t s); static uint8_t add_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t add_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t add_long (struct x86emu *, uint32_t d, uint32_t s); static uint8_t and_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t and_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t and_long (struct x86emu *, uint32_t d, uint32_t s); static uint8_t cmp_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t cmp_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t cmp_long (struct x86emu *, uint32_t d, uint32_t s); static void cmp_byte_no_return (struct x86emu *, uint8_t d, uint8_t s); static void cmp_word_no_return (struct x86emu *, uint16_t d, uint16_t s); static void cmp_long_no_return (struct x86emu *, uint32_t d, uint32_t s); static uint8_t daa_byte (struct x86emu *, uint8_t d); static uint8_t das_byte (struct x86emu *, uint8_t d); static uint8_t dec_byte (struct x86emu *, uint8_t d); static uint16_t dec_word (struct x86emu *, uint16_t d); static uint32_t dec_long (struct x86emu *, uint32_t d); static uint8_t inc_byte (struct x86emu *, uint8_t d); static uint16_t inc_word (struct x86emu *, uint16_t d); static uint32_t inc_long (struct x86emu *, uint32_t d); static uint8_t or_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t or_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t or_long (struct x86emu *, uint32_t d, uint32_t s); static uint8_t neg_byte (struct x86emu *, uint8_t s); static uint16_t neg_word (struct x86emu *, uint16_t s); static uint32_t neg_long (struct x86emu *, uint32_t s); static uint8_t rcl_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t rcl_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t rcl_long (struct x86emu *, uint32_t d, uint8_t s); static uint8_t rcr_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t rcr_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t rcr_long (struct x86emu *, uint32_t d, uint8_t s); static uint8_t rol_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t rol_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t rol_long (struct x86emu *, uint32_t d, uint8_t s); static uint8_t ror_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t ror_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t ror_long (struct x86emu *, uint32_t d, uint8_t s); static uint8_t shl_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t shl_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t shl_long (struct x86emu *, uint32_t d, uint8_t s); static uint8_t shr_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t shr_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t shr_long (struct x86emu *, uint32_t d, uint8_t s); static uint8_t sar_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t sar_word (struct x86emu *, uint16_t d, uint8_t s); static uint32_t sar_long (struct x86emu *, uint32_t d, uint8_t s); static uint16_t shld_word (struct x86emu *, uint16_t d, uint16_t fill, uint8_t s); static uint32_t shld_long (struct x86emu *, uint32_t d, uint32_t fill, uint8_t s); static uint16_t shrd_word (struct x86emu *, uint16_t d, uint16_t fill, uint8_t s); static uint32_t shrd_long (struct x86emu *, uint32_t d, uint32_t fill, uint8_t s); static uint8_t sbb_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t sbb_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t sbb_long (struct x86emu *, uint32_t d, uint32_t s); static uint8_t sub_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t sub_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t sub_long (struct x86emu *, uint32_t d, uint32_t s); static void test_byte (struct x86emu *, uint8_t d, uint8_t s); static void test_word (struct x86emu *, uint16_t d, uint16_t s); static void test_long (struct x86emu *, uint32_t d, uint32_t s); static uint8_t xor_byte (struct x86emu *, uint8_t d, uint8_t s); static uint16_t xor_word (struct x86emu *, uint16_t d, uint16_t s); static uint32_t xor_long (struct x86emu *, uint32_t d, uint32_t s); static void imul_byte (struct x86emu *, uint8_t s); static void imul_word (struct x86emu *, uint16_t s); static void imul_long (struct x86emu *, uint32_t s); static void mul_byte (struct x86emu *, uint8_t s); static void mul_word (struct x86emu *, uint16_t s); static void mul_long (struct x86emu *, uint32_t s); static void idiv_byte (struct x86emu *, uint8_t s); static void idiv_word (struct x86emu *, uint16_t s); static void idiv_long (struct x86emu *, uint32_t s); static void div_byte (struct x86emu *, uint8_t s); static void div_word (struct x86emu *, uint16_t s); static void div_long (struct x86emu *, uint32_t s); static void ins (struct x86emu *, int size); static void outs (struct x86emu *, int size); static void push_word (struct x86emu *, uint16_t w); static void push_long (struct x86emu *, uint32_t w); static uint16_t pop_word (struct x86emu *); static uint32_t pop_long (struct x86emu *); /* * REMARKS: * Handles any pending asychronous interrupts. */ static void x86emu_intr_dispatch(struct x86emu *emu, uint8_t intno) { if (emu->_x86emu_intrTab[intno]) { (*emu->_x86emu_intrTab[intno]) (emu, intno); } else { push_word(emu, (uint16_t) emu->x86.R_FLG); CLEAR_FLAG(F_IF); CLEAR_FLAG(F_TF); push_word(emu, emu->x86.R_CS); emu->x86.R_CS = fetch_word(emu, 0, intno * 4 + 2); push_word(emu, emu->x86.R_IP); emu->x86.R_IP = fetch_word(emu, 0, intno * 4); } } static void x86emu_intr_handle(struct x86emu *emu) { uint8_t intno; if (emu->x86.intr & INTR_SYNCH) { intno = emu->x86.intno; emu->x86.intr = 0; x86emu_intr_dispatch(emu, intno); } } /* * PARAMETERS: * intrnum - Interrupt number to raise * * REMARKS: * Raise the specified interrupt to be handled before the execution of the * next instruction. */ void x86emu_intr_raise(struct x86emu *emu, uint8_t intrnum) { emu->x86.intno = intrnum; emu->x86.intr |= INTR_SYNCH; } /* * REMARKS: * Main execution loop for the emulator. We return from here when the system * halts, which is normally caused by a stack fault when we return from the * original real mode call. */ void x86emu_exec(struct x86emu *emu) { emu->x86.intr = 0; if (setjmp(emu->exec_state)) return; for (;;) { if (emu->x86.intr) { if (((emu->x86.intr & INTR_SYNCH) && (emu->x86.intno == 0 || emu->x86.intno == 2)) || !ACCESS_FLAG(F_IF)) { x86emu_intr_handle(emu); } } if (emu->x86.R_CS == 0 && emu->x86.R_IP == 0) return; x86emu_exec_one_byte(emu); ++emu->cur_cycles; } } void x86emu_exec_call(struct x86emu *emu, uint16_t seg, uint16_t off) { push_word(emu, 0); push_word(emu, 0); emu->x86.R_CS = seg; emu->x86.R_IP = off; x86emu_exec(emu); } void x86emu_exec_intr(struct x86emu *emu, uint8_t intr) { push_word(emu, emu->x86.R_FLG); CLEAR_FLAG(F_IF); CLEAR_FLAG(F_TF); push_word(emu, 0); push_word(emu, 0); emu->x86.R_CS = (*emu->emu_rdw)(emu, intr * 4 + 2); emu->x86.R_IP = (*emu->emu_rdw)(emu, intr * 4); emu->x86.intr = 0; x86emu_exec(emu); } /* * REMARKS: * Halts the system by setting the halted system flag. */ void x86emu_halt_sys(struct x86emu *emu) { longjmp(emu->exec_state, 1); } /* * PARAMETERS: * mod - Mod value from decoded byte * regh - Reg h value from decoded byte * regl - Reg l value from decoded byte * * REMARKS: * Raise the specified interrupt to be handled before the execution of the * next instruction. * * NOTE: Do not inline this function, as (*emu->emu_rdb) is already inline! */ static void fetch_decode_modrm(struct x86emu *emu) { int fetched; fetched = fetch_byte_imm(emu); emu->cur_mod = (fetched >> 6) & 0x03; emu->cur_rh = (fetched >> 3) & 0x07; emu->cur_rl = (fetched >> 0) & 0x07; } /* * RETURNS: * Immediate byte value read from instruction queue * * REMARKS: * This function returns the immediate byte from the instruction queue, and * moves the instruction pointer to the next value. * * NOTE: Do not inline this function, as (*emu->emu_rdb) is already inline! */ static uint8_t fetch_byte_imm(struct x86emu *emu) { uint8_t fetched; fetched = fetch_byte(emu, emu->x86.R_CS, emu->x86.R_IP); emu->x86.R_IP++; return fetched; } /* * RETURNS: * Immediate word value read from instruction queue * * REMARKS: * This function returns the immediate byte from the instruction queue, and * moves the instruction pointer to the next value. * * NOTE: Do not inline this function, as (*emu->emu_rdw) is already inline! */ static uint16_t fetch_word_imm(struct x86emu *emu) { uint16_t fetched; fetched = fetch_word(emu, emu->x86.R_CS, emu->x86.R_IP); emu->x86.R_IP += 2; return fetched; } /* * RETURNS: * Immediate lone value read from instruction queue * * REMARKS: * This function returns the immediate byte from the instruction queue, and * moves the instruction pointer to the next value. * * NOTE: Do not inline this function, as (*emu->emu_rdw) is already inline! */ static uint32_t fetch_long_imm(struct x86emu *emu) { uint32_t fetched; fetched = fetch_long(emu, emu->x86.R_CS, emu->x86.R_IP); emu->x86.R_IP += 4; return fetched; } /* * RETURNS: * Value of the default data segment * * REMARKS: * Inline function that returns the default data segment for the current * instruction. * * On the x86 processor, the default segment is not always DS if there is * no segment override. Address modes such as -3[BP] or 10[BP+SI] all refer to * addresses relative to SS (ie: on the stack). So, at the minimum, all * decodings of addressing modes would have to set/clear a bit describing * whether the access is relative to DS or SS. That is the function of the * cpu-state-varible emu->x86.mode. There are several potential states: * * repe prefix seen (handled elsewhere) * repne prefix seen (ditto) * * cs segment override * ds segment override * es segment override * fs segment override * gs segment override * ss segment override * * ds/ss select (in absense of override) * * Each of the above 7 items are handled with a bit in the mode field. */ static uint32_t get_data_segment(struct x86emu *emu) { switch (emu->x86.mode & SYSMODE_SEGMASK) { case 0: /* default case: use ds register */ case SYSMODE_SEGOVR_DS: case SYSMODE_SEGOVR_DS | SYSMODE_SEG_DS_SS: return emu->x86.R_DS; case SYSMODE_SEG_DS_SS:/* non-overridden, use ss register */ return emu->x86.R_SS; case SYSMODE_SEGOVR_CS: case SYSMODE_SEGOVR_CS | SYSMODE_SEG_DS_SS: return emu->x86.R_CS; case SYSMODE_SEGOVR_ES: case SYSMODE_SEGOVR_ES | SYSMODE_SEG_DS_SS: return emu->x86.R_ES; case SYSMODE_SEGOVR_FS: case SYSMODE_SEGOVR_FS | SYSMODE_SEG_DS_SS: return emu->x86.R_FS; case SYSMODE_SEGOVR_GS: case SYSMODE_SEGOVR_GS | SYSMODE_SEG_DS_SS: return emu->x86.R_GS; case SYSMODE_SEGOVR_SS: case SYSMODE_SEGOVR_SS | SYSMODE_SEG_DS_SS: return emu->x86.R_SS; } x86emu_halt_sys(emu); } /* * PARAMETERS: * offset - Offset to load data from * * RETURNS: * Byte value read from the absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_rdX) is already inline! */ static uint8_t fetch_data_byte(struct x86emu *emu, uint32_t offset) { return fetch_byte(emu, get_data_segment(emu), offset); } /* * PARAMETERS: * offset - Offset to load data from * * RETURNS: * Word value read from the absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_rdX) is already inline! */ static uint16_t fetch_data_word(struct x86emu *emu, uint32_t offset) { return fetch_word(emu, get_data_segment(emu), offset); } /* * PARAMETERS: * offset - Offset to load data from * * RETURNS: * Long value read from the absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_rdX) is already inline! */ static uint32_t fetch_data_long(struct x86emu *emu, uint32_t offset) { return fetch_long(emu, get_data_segment(emu), offset); } /* * PARAMETERS: * segment - Segment to load data from * offset - Offset to load data from * * RETURNS: * Byte value read from the absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_rdX) is already inline! */ static uint8_t fetch_byte(struct x86emu *emu, uint32_t segment, uint32_t offset) { return (*emu->emu_rdb) (emu, ((uint32_t) segment << 4) + offset); } /* * PARAMETERS: * segment - Segment to load data from * offset - Offset to load data from * * RETURNS: * Word value read from the absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_rdX) is already inline! */ static uint16_t fetch_word(struct x86emu *emu, uint32_t segment, uint32_t offset) { return (*emu->emu_rdw) (emu, ((uint32_t) segment << 4) + offset); } /* * PARAMETERS: * segment - Segment to load data from * offset - Offset to load data from * * RETURNS: * Long value read from the absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_rdX) is already inline! */ static uint32_t fetch_long(struct x86emu *emu, uint32_t segment, uint32_t offset) { return (*emu->emu_rdl) (emu, ((uint32_t) segment << 4) + offset); } /* * PARAMETERS: * offset - Offset to store data at * val - Value to store * * REMARKS: * Writes a word value to an segmented memory location. The segment used is * the current 'default' segment, which may have been overridden. * * NOTE: Do not inline this function as (*emu->emu_wrX) is already inline! */ static void store_data_byte(struct x86emu *emu, uint32_t offset, uint8_t val) { store_byte(emu, get_data_segment(emu), offset, val); } /* * PARAMETERS: * offset - Offset to store data at * val - Value to store * * REMARKS: * Writes a word value to an segmented memory location. The segment used is * the current 'default' segment, which may have been overridden. * * NOTE: Do not inline this function as (*emu->emu_wrX) is already inline! */ static void store_data_word(struct x86emu *emu, uint32_t offset, uint16_t val) { store_word(emu, get_data_segment(emu), offset, val); } /* * PARAMETERS: * offset - Offset to store data at * val - Value to store * * REMARKS: * Writes a long value to an segmented memory location. The segment used is * the current 'default' segment, which may have been overridden. * * NOTE: Do not inline this function as (*emu->emu_wrX) is already inline! */ static void store_data_long(struct x86emu *emu, uint32_t offset, uint32_t val) { store_long(emu, get_data_segment(emu), offset, val); } /* * PARAMETERS: * segment - Segment to store data at * offset - Offset to store data at * val - Value to store * * REMARKS: * Writes a byte value to an absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_wrX) is already inline! */ static void store_byte(struct x86emu *emu, uint32_t segment, uint32_t offset, uint8_t val) { (*emu->emu_wrb) (emu, ((uint32_t) segment << 4) + offset, val); } /* * PARAMETERS: * segment - Segment to store data at * offset - Offset to store data at * val - Value to store * * REMARKS: * Writes a word value to an absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_wrX) is already inline! */ static void store_word(struct x86emu *emu, uint32_t segment, uint32_t offset, uint16_t val) { (*emu->emu_wrw) (emu, ((uint32_t) segment << 4) + offset, val); } /* * PARAMETERS: * segment - Segment to store data at * offset - Offset to store data at * val - Value to store * * REMARKS: * Writes a long value to an absolute memory location. * * NOTE: Do not inline this function as (*emu->emu_wrX) is already inline! */ static void store_long(struct x86emu *emu, uint32_t segment, uint32_t offset, uint32_t val) { (*emu->emu_wrl) (emu, ((uint32_t) segment << 4) + offset, val); } /* * PARAMETERS: * reg - Register to decode * * RETURNS: * Pointer to the appropriate register * * REMARKS: * Return a pointer to the register given by the R/RM field of the * modrm byte, for byte operands. Also enables the decoding of instructions. */ static uint8_t * decode_rm_byte_register(struct x86emu *emu, int reg) { switch (reg) { case 0: return &emu->x86.R_AL; case 1: return &emu->x86.R_CL; case 2: return &emu->x86.R_DL; case 3: return &emu->x86.R_BL; case 4: return &emu->x86.R_AH; case 5: return &emu->x86.R_CH; case 6: return &emu->x86.R_DH; case 7: return &emu->x86.R_BH; default: x86emu_halt_sys(emu); } } static uint8_t * decode_rl_byte_register(struct x86emu *emu) { return decode_rm_byte_register(emu, emu->cur_rl); } static uint8_t * decode_rh_byte_register(struct x86emu *emu) { return decode_rm_byte_register(emu, emu->cur_rh); } /* * PARAMETERS: * reg - Register to decode * * RETURNS: * Pointer to the appropriate register * * REMARKS: * Return a pointer to the register given by the R/RM field of the * modrm byte, for word operands. Also enables the decoding of instructions. */ static uint16_t * decode_rm_word_register(struct x86emu *emu, int reg) { switch (reg) { case 0: return &emu->x86.R_AX; case 1: return &emu->x86.R_CX; case 2: return &emu->x86.R_DX; case 3: return &emu->x86.R_BX; case 4: return &emu->x86.R_SP; case 5: return &emu->x86.R_BP; case 6: return &emu->x86.R_SI; case 7: return &emu->x86.R_DI; default: x86emu_halt_sys(emu); } } static uint16_t * decode_rl_word_register(struct x86emu *emu) { return decode_rm_word_register(emu, emu->cur_rl); } static uint16_t * decode_rh_word_register(struct x86emu *emu) { return decode_rm_word_register(emu, emu->cur_rh); } /* * PARAMETERS: * reg - Register to decode * * RETURNS: * Pointer to the appropriate register * * REMARKS: * Return a pointer to the register given by the R/RM field of the * modrm byte, for dword operands. Also enables the decoding of instructions. */ static uint32_t * decode_rm_long_register(struct x86emu *emu, int reg) { switch (reg) { case 0: return &emu->x86.R_EAX; case 1: return &emu->x86.R_ECX; case 2: return &emu->x86.R_EDX; case 3: return &emu->x86.R_EBX; case 4: return &emu->x86.R_ESP; case 5: return &emu->x86.R_EBP; case 6: return &emu->x86.R_ESI; case 7: return &emu->x86.R_EDI; default: x86emu_halt_sys(emu); } } static uint32_t * decode_rl_long_register(struct x86emu *emu) { return decode_rm_long_register(emu, emu->cur_rl); } static uint32_t * decode_rh_long_register(struct x86emu *emu) { return decode_rm_long_register(emu, emu->cur_rh); } /* * PARAMETERS: * reg - Register to decode * * RETURNS: * Pointer to the appropriate register * * REMARKS: * Return a pointer to the register given by the R/RM field of the * modrm byte, for word operands, modified from above for the weirdo * special case of segreg operands. Also enables the decoding of instructions. */ static uint16_t * decode_rh_seg_register(struct x86emu *emu) { switch (emu->cur_rh) { case 0: return &emu->x86.R_ES; case 1: return &emu->x86.R_CS; case 2: return &emu->x86.R_SS; case 3: return &emu->x86.R_DS; case 4: return &emu->x86.R_FS; case 5: return &emu->x86.R_GS; default: x86emu_halt_sys(emu); } } /* * Return offset from the SIB Byte. */ static uint32_t decode_sib_address(struct x86emu *emu, int sib, int mod) { uint32_t base = 0, i = 0, scale = 1; switch (sib & 0x07) { case 0: base = emu->x86.R_EAX; break; case 1: base = emu->x86.R_ECX; break; case 2: base = emu->x86.R_EDX; break; case 3: base = emu->x86.R_EBX; break; case 4: base = emu->x86.R_ESP; emu->x86.mode |= SYSMODE_SEG_DS_SS; break; case 5: if (mod == 0) { base = fetch_long_imm(emu); } else { base = emu->x86.R_EBP; emu->x86.mode |= SYSMODE_SEG_DS_SS; } break; case 6: base = emu->x86.R_ESI; break; case 7: base = emu->x86.R_EDI; break; } switch ((sib >> 3) & 0x07) { case 0: i = emu->x86.R_EAX; break; case 1: i = emu->x86.R_ECX; break; case 2: i = emu->x86.R_EDX; break; case 3: i = emu->x86.R_EBX; break; case 4: i = 0; break; case 5: i = emu->x86.R_EBP; break; case 6: i = emu->x86.R_ESI; break; case 7: i = emu->x86.R_EDI; break; } scale = 1 << ((sib >> 6) & 0x03); return base + (i * scale); } /* * PARAMETERS: * rm - RM value to decode * * RETURNS: * Offset in memory for the address decoding * * REMARKS: * Return the offset given by mod=00, mod=01 or mod=10 addressing. * Also enables the decoding of instructions. */ static uint32_t decode_rl_address(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_ADDR) { uint32_t offset, sib; /* 32-bit addressing */ switch (emu->cur_rl) { case 0: offset = emu->x86.R_EAX; break; case 1: offset = emu->x86.R_ECX; break; case 2: offset = emu->x86.R_EDX; break; case 3: offset = emu->x86.R_EBX; break; case 4: sib = fetch_byte_imm(emu); offset = decode_sib_address(emu, sib, 0); break; case 5: if (emu->cur_mod == 0) { offset = fetch_long_imm(emu); } else { emu->x86.mode |= SYSMODE_SEG_DS_SS; offset = emu->x86.R_EBP; } break; case 6: offset = emu->x86.R_ESI; break; case 7: offset = emu->x86.R_EDI; break; default: x86emu_halt_sys(emu); } if (emu->cur_mod == 1) offset += (int8_t)fetch_byte_imm(emu); else if (emu->cur_mod == 2) offset += fetch_long_imm(emu); return offset; } else { uint16_t offset; /* 16-bit addressing */ switch (emu->cur_rl) { case 0: offset = emu->x86.R_BX + emu->x86.R_SI; break; case 1: offset = emu->x86.R_BX + emu->x86.R_DI; break; case 2: emu->x86.mode |= SYSMODE_SEG_DS_SS; offset = emu->x86.R_BP + emu->x86.R_SI; break; case 3: emu->x86.mode |= SYSMODE_SEG_DS_SS; offset = emu->x86.R_BP + emu->x86.R_DI; break; case 4: offset = emu->x86.R_SI; break; case 5: offset = emu->x86.R_DI; break; case 6: if (emu->cur_mod == 0) { offset = fetch_word_imm(emu); } else { emu->x86.mode |= SYSMODE_SEG_DS_SS; offset = emu->x86.R_BP; } break; case 7: offset = emu->x86.R_BX; break; default: x86emu_halt_sys(emu); } if (emu->cur_mod == 1) offset += (int8_t)fetch_byte_imm(emu); else if (emu->cur_mod == 2) offset += fetch_word_imm(emu); return offset; } } static uint8_t decode_and_fetch_byte(struct x86emu *emu) { if (emu->cur_mod != 3) { emu->cur_offset = decode_rl_address(emu); return fetch_data_byte(emu, emu->cur_offset); } else { return *decode_rl_byte_register(emu); } } static uint16_t decode_and_fetch_word_disp(struct x86emu *emu, int16_t disp) { if (emu->cur_mod != 3) { /* TODO: A20 gate emulation */ emu->cur_offset = decode_rl_address(emu) + disp; if ((emu->x86.mode & SYSMODE_PREFIX_ADDR) == 0) emu->cur_offset &= 0xffff; return fetch_data_word(emu, emu->cur_offset); } else { return *decode_rl_word_register(emu); } } static uint32_t decode_and_fetch_long_disp(struct x86emu *emu, int16_t disp) { if (emu->cur_mod != 3) { /* TODO: A20 gate emulation */ emu->cur_offset = decode_rl_address(emu) + disp; if ((emu->x86.mode & SYSMODE_PREFIX_ADDR) == 0) emu->cur_offset &= 0xffff; return fetch_data_long(emu, emu->cur_offset); } else { return *decode_rl_long_register(emu); } } uint16_t decode_and_fetch_word(struct x86emu *emu) { return decode_and_fetch_word_disp(emu, 0); } uint32_t decode_and_fetch_long(struct x86emu *emu) { return decode_and_fetch_long_disp(emu, 0); } uint8_t decode_and_fetch_byte_imm8(struct x86emu *emu, uint8_t *imm) { if (emu->cur_mod != 3) { emu->cur_offset = decode_rl_address(emu); *imm = fetch_byte_imm(emu); return fetch_data_byte(emu, emu->cur_offset); } else { *imm = fetch_byte_imm(emu); return *decode_rl_byte_register(emu); } } static uint16_t decode_and_fetch_word_imm8(struct x86emu *emu, uint8_t *imm) { if (emu->cur_mod != 3) { emu->cur_offset = decode_rl_address(emu); *imm = fetch_byte_imm(emu); return fetch_data_word(emu, emu->cur_offset); } else { *imm = fetch_byte_imm(emu); return *decode_rl_word_register(emu); } } static uint32_t decode_and_fetch_long_imm8(struct x86emu *emu, uint8_t *imm) { if (emu->cur_mod != 3) { emu->cur_offset = decode_rl_address(emu); *imm = fetch_byte_imm(emu); return fetch_data_long(emu, emu->cur_offset); } else { *imm = fetch_byte_imm(emu); return *decode_rl_long_register(emu); } } static void write_back_byte(struct x86emu *emu, uint8_t val) { if (emu->cur_mod != 3) store_data_byte(emu, emu->cur_offset, val); else *decode_rl_byte_register(emu) = val; } static void write_back_word(struct x86emu *emu, uint16_t val) { if (emu->cur_mod != 3) store_data_word(emu, emu->cur_offset, val); else *decode_rl_word_register(emu) = val; } static void write_back_long(struct x86emu *emu, uint32_t val) { if (emu->cur_mod != 3) store_data_long(emu, emu->cur_offset, val); else *decode_rl_long_register(emu) = val; } static void common_inc_word_long(struct x86emu *emu, union x86emu_register *reg) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) reg->I32_reg.e_reg = inc_long(emu, reg->I32_reg.e_reg); else reg->I16_reg.x_reg = inc_word(emu, reg->I16_reg.x_reg); } static void common_dec_word_long(struct x86emu *emu, union x86emu_register *reg) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) reg->I32_reg.e_reg = dec_long(emu, reg->I32_reg.e_reg); else reg->I16_reg.x_reg = dec_word(emu, reg->I16_reg.x_reg); } static void common_binop_byte_rm_r(struct x86emu *emu, uint8_t (*binop)(struct x86emu *, uint8_t, uint8_t)) { uint32_t destoffset; uint8_t *destreg, srcval; uint8_t destval; fetch_decode_modrm(emu); srcval = *decode_rh_byte_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_byte(emu, destoffset); destval = (*binop)(emu, destval, srcval); store_data_byte(emu, destoffset, destval); } else { destreg = decode_rl_byte_register(emu); *destreg = (*binop)(emu, *destreg, srcval); } } static void common_binop_ns_byte_rm_r(struct x86emu *emu, void (*binop)(struct x86emu *, uint8_t, uint8_t)) { uint32_t destoffset; uint8_t destval, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_byte_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_byte(emu, destoffset); } else { destval = *decode_rl_byte_register(emu); } (*binop)(emu, destval, srcval); } static void common_binop_word_rm_r(struct x86emu *emu, uint16_t (*binop)(struct x86emu *, uint16_t, uint16_t)) { uint32_t destoffset; uint16_t destval, *destreg, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_word_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_word(emu, destoffset); destval = (*binop)(emu, destval, srcval); store_data_word(emu, destoffset, destval); } else { destreg = decode_rl_word_register(emu); *destreg = (*binop)(emu, *destreg, srcval); } } static void common_binop_byte_r_rm(struct x86emu *emu, uint8_t (*binop)(struct x86emu *, uint8_t, uint8_t)) { uint8_t *destreg, srcval; uint32_t srcoffset; fetch_decode_modrm(emu); destreg = decode_rh_byte_register(emu); if (emu->cur_mod != 3) { srcoffset = decode_rl_address(emu); srcval = fetch_data_byte(emu, srcoffset); } else { srcval = *decode_rl_byte_register(emu); } *destreg = (*binop)(emu, *destreg, srcval); } static void common_binop_long_rm_r(struct x86emu *emu, uint32_t (*binop)(struct x86emu *, uint32_t, uint32_t)) { uint32_t destoffset; uint32_t destval, *destreg, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_long_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_long(emu, destoffset); destval = (*binop)(emu, destval, srcval); store_data_long(emu, destoffset, destval); } else { destreg = decode_rl_long_register(emu); *destreg = (*binop)(emu, *destreg, srcval); } } static void common_binop_word_long_rm_r(struct x86emu *emu, uint16_t (*binop16)(struct x86emu *, uint16_t, uint16_t), uint32_t (*binop32)(struct x86emu *, uint32_t, uint32_t)) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_binop_long_rm_r(emu, binop32); else common_binop_word_rm_r(emu, binop16); } static void common_binop_ns_word_rm_r(struct x86emu *emu, void (*binop)(struct x86emu *, uint16_t, uint16_t)) { uint32_t destoffset; uint16_t destval, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_word_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_word(emu, destoffset); } else { destval = *decode_rl_word_register(emu); } (*binop)(emu, destval, srcval); } static void common_binop_ns_long_rm_r(struct x86emu *emu, void (*binop)(struct x86emu *, uint32_t, uint32_t)) { uint32_t destoffset; uint32_t destval, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_long_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_long(emu, destoffset); } else { destval = *decode_rl_long_register(emu); } (*binop)(emu, destval, srcval); } static void common_binop_ns_word_long_rm_r(struct x86emu *emu, void (*binop16)(struct x86emu *, uint16_t, uint16_t), void (*binop32)(struct x86emu *, uint32_t, uint32_t)) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_binop_ns_long_rm_r(emu, binop32); else common_binop_ns_word_rm_r(emu, binop16); } static void common_binop_long_r_rm(struct x86emu *emu, uint32_t (*binop)(struct x86emu *, uint32_t, uint32_t)) { uint32_t srcoffset; uint32_t *destreg, srcval; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); if (emu->cur_mod != 3) { srcoffset = decode_rl_address(emu); srcval = fetch_data_long(emu, srcoffset); } else { srcval = *decode_rl_long_register(emu); } *destreg = (*binop)(emu, *destreg, srcval); } static void common_binop_word_r_rm(struct x86emu *emu, uint16_t (*binop)(struct x86emu *, uint16_t, uint16_t)) { uint32_t srcoffset; uint16_t *destreg, srcval; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); if (emu->cur_mod != 3) { srcoffset = decode_rl_address(emu); srcval = fetch_data_word(emu, srcoffset); } else { srcval = *decode_rl_word_register(emu); } *destreg = (*binop)(emu, *destreg, srcval); } static void common_binop_word_long_r_rm(struct x86emu *emu, uint16_t (*binop16)(struct x86emu *, uint16_t, uint16_t), uint32_t (*binop32)(struct x86emu *, uint32_t, uint32_t)) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_binop_long_r_rm(emu, binop32); else common_binop_word_r_rm(emu, binop16); } static void common_binop_byte_imm(struct x86emu *emu, uint8_t (*binop)(struct x86emu *, uint8_t, uint8_t)) { uint8_t srcval; srcval = fetch_byte_imm(emu); emu->x86.R_AL = (*binop)(emu, emu->x86.R_AL, srcval); } static void common_binop_word_long_imm(struct x86emu *emu, uint16_t (*binop16)(struct x86emu *, uint16_t, uint16_t), uint32_t (*binop32)(struct x86emu *, uint32_t, uint32_t)) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t srcval; srcval = fetch_long_imm(emu); emu->x86.R_EAX = (*binop32)(emu, emu->x86.R_EAX, srcval); } else { uint16_t srcval; srcval = fetch_word_imm(emu); emu->x86.R_AX = (*binop16)(emu, emu->x86.R_AX, srcval); } } static void common_push_word_long(struct x86emu *emu, union x86emu_register *reg) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) push_long(emu, reg->I32_reg.e_reg); else push_word(emu, reg->I16_reg.x_reg); } static void common_pop_word_long(struct x86emu *emu, union x86emu_register *reg) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) reg->I32_reg.e_reg = pop_long(emu); else reg->I16_reg.x_reg = pop_word(emu); } static void common_imul_long_IMM(struct x86emu *emu, int byte_imm) { uint32_t srcoffset; uint32_t *destreg, srcval; int32_t imm; uint64_t res; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); if (emu->cur_mod != 3) { srcoffset = decode_rl_address(emu); srcval = fetch_data_long(emu, srcoffset); } else { srcval = *decode_rl_long_register(emu); } if (byte_imm) imm = (int8_t)fetch_byte_imm(emu); else imm = fetch_long_imm(emu); res = (int32_t)srcval * imm; if (res > 0xffffffff) { SET_FLAG(F_CF); SET_FLAG(F_OF); } else { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } *destreg = (uint32_t)res; } static void common_imul_word_IMM(struct x86emu *emu, int byte_imm) { uint32_t srcoffset; uint16_t *destreg, srcval; int16_t imm; uint32_t res; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); if (emu->cur_mod != 3) { srcoffset = decode_rl_address(emu); srcval = fetch_data_word(emu, srcoffset); } else { srcval = *decode_rl_word_register(emu); } if (byte_imm) imm = (int8_t)fetch_byte_imm(emu); else imm = fetch_word_imm(emu); res = (int16_t)srcval * imm; if (res > 0xffff) { SET_FLAG(F_CF); SET_FLAG(F_OF); } else { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } *destreg = (uint16_t) res; } static void common_imul_imm(struct x86emu *emu, int byte_imm) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_imul_long_IMM(emu, byte_imm); else common_imul_word_IMM(emu, byte_imm); } static void common_jmp_near(struct x86emu *emu, int cond) { int8_t offset; uint16_t target; offset = (int8_t) fetch_byte_imm(emu); target = (uint16_t) (emu->x86.R_IP + (int16_t) offset); if (cond) emu->x86.R_IP = target; } static void common_load_far_pointer(struct x86emu *emu, uint16_t *seg) { uint16_t *dstreg; uint32_t srcoffset; fetch_decode_modrm(emu); if (emu->cur_mod == 3) x86emu_halt_sys(emu); dstreg = decode_rh_word_register(emu); srcoffset = decode_rl_address(emu); *dstreg = fetch_data_word(emu, srcoffset); *seg = fetch_data_word(emu, srcoffset + 2); } /* Implementation */ /* * REMARKS: * Handles opcode 0x3a */ static void x86emuOp_cmp_byte_R_RM(struct x86emu *emu) { uint8_t *destreg, srcval; fetch_decode_modrm(emu); destreg = decode_rh_byte_register(emu); srcval = decode_and_fetch_byte(emu); cmp_byte(emu, *destreg, srcval); } /* * REMARKS: * * Handles opcode 0x3b */ static void x86emuOp32_cmp_word_R_RM(struct x86emu *emu) { uint32_t srcval, *destreg; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); srcval = decode_and_fetch_long(emu); cmp_long(emu, *destreg, srcval); } static void x86emuOp16_cmp_word_R_RM(struct x86emu *emu) { uint16_t srcval, *destreg; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); srcval = decode_and_fetch_word(emu); cmp_word(emu, *destreg, srcval); } static void x86emuOp_cmp_word_R_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_cmp_word_R_RM(emu); else x86emuOp16_cmp_word_R_RM(emu); } /* * REMARKS: * Handles opcode 0x3c */ static void x86emuOp_cmp_byte_AL_IMM(struct x86emu *emu) { uint8_t srcval; srcval = fetch_byte_imm(emu); cmp_byte(emu, emu->x86.R_AL, srcval); } /* * REMARKS: * Handles opcode 0x3d */ static void x86emuOp32_cmp_word_AX_IMM(struct x86emu *emu) { uint32_t srcval; srcval = fetch_long_imm(emu); cmp_long(emu, emu->x86.R_EAX, srcval); } static void x86emuOp16_cmp_word_AX_IMM(struct x86emu *emu) { uint16_t srcval; srcval = fetch_word_imm(emu); cmp_word(emu, emu->x86.R_AX, srcval); } static void x86emuOp_cmp_word_AX_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_cmp_word_AX_IMM(emu); else x86emuOp16_cmp_word_AX_IMM(emu); } /* * REMARKS: * Handles opcode 0x60 */ static void x86emuOp_push_all(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t old_sp = emu->x86.R_ESP; push_long(emu, emu->x86.R_EAX); push_long(emu, emu->x86.R_ECX); push_long(emu, emu->x86.R_EDX); push_long(emu, emu->x86.R_EBX); push_long(emu, old_sp); push_long(emu, emu->x86.R_EBP); push_long(emu, emu->x86.R_ESI); push_long(emu, emu->x86.R_EDI); } else { uint16_t old_sp = emu->x86.R_SP; push_word(emu, emu->x86.R_AX); push_word(emu, emu->x86.R_CX); push_word(emu, emu->x86.R_DX); push_word(emu, emu->x86.R_BX); push_word(emu, old_sp); push_word(emu, emu->x86.R_BP); push_word(emu, emu->x86.R_SI); push_word(emu, emu->x86.R_DI); } } /* * REMARKS: * Handles opcode 0x61 */ static void x86emuOp_pop_all(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_EDI = pop_long(emu); emu->x86.R_ESI = pop_long(emu); emu->x86.R_EBP = pop_long(emu); emu->x86.R_ESP += 4; /* skip ESP */ emu->x86.R_EBX = pop_long(emu); emu->x86.R_EDX = pop_long(emu); emu->x86.R_ECX = pop_long(emu); emu->x86.R_EAX = pop_long(emu); } else { emu->x86.R_DI = pop_word(emu); emu->x86.R_SI = pop_word(emu); emu->x86.R_BP = pop_word(emu); emu->x86.R_SP += 2;/* skip SP */ emu->x86.R_BX = pop_word(emu); emu->x86.R_DX = pop_word(emu); emu->x86.R_CX = pop_word(emu); emu->x86.R_AX = pop_word(emu); } } /*opcode 0x62 ILLEGAL OP, calls x86emuOp_illegal_op() */ /*opcode 0x63 ILLEGAL OP, calls x86emuOp_illegal_op() */ /* * REMARKS: * Handles opcode 0x68 */ static void x86emuOp_push_word_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t imm; imm = fetch_long_imm(emu); push_long(emu, imm); } else { uint16_t imm; imm = fetch_word_imm(emu); push_word(emu, imm); } } /* * REMARKS: * Handles opcode 0x6a */ static void x86emuOp_push_byte_IMM(struct x86emu *emu) { int16_t imm; imm = (int8_t) fetch_byte_imm(emu); if (emu->x86.mode & SYSMODE_PREFIX_DATA) { push_long(emu, (int32_t) imm); } else { push_word(emu, imm); } } /* * REMARKS: * Handles opcode 0x6c and 0x6d */ static void x86emuOp_ins_word(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { ins(emu, 4); } else { ins(emu, 2); } } /* * REMARKS: * Handles opcode 0x6f */ static void x86emuOp_outs_word(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { outs(emu, 4); } else { outs(emu, 2); } } /* * REMARKS: * Handles opcode 0x7c */ static void x86emuOp_jump_near_L(struct x86emu *emu) { int sf, of; sf = ACCESS_FLAG(F_SF) != 0; of = ACCESS_FLAG(F_OF) != 0; common_jmp_near(emu, sf != of); } /* * REMARKS: * Handles opcode 0x7d */ static void x86emuOp_jump_near_NL(struct x86emu *emu) { int sf, of; sf = ACCESS_FLAG(F_SF) != 0; of = ACCESS_FLAG(F_OF) != 0; common_jmp_near(emu, sf == of); } /* * REMARKS: * Handles opcode 0x7e */ static void x86emuOp_jump_near_LE(struct x86emu *emu) { int sf, of; sf = ACCESS_FLAG(F_SF) != 0; of = ACCESS_FLAG(F_OF) != 0; common_jmp_near(emu, sf != of || ACCESS_FLAG(F_ZF)); } /* * REMARKS: * Handles opcode 0x7f */ static void x86emuOp_jump_near_NLE(struct x86emu *emu) { int sf, of; sf = ACCESS_FLAG(F_SF) != 0; of = ACCESS_FLAG(F_OF) != 0; common_jmp_near(emu, sf == of && !ACCESS_FLAG(F_ZF)); } static uint8_t(*const opc80_byte_operation[]) (struct x86emu *, uint8_t d, uint8_t s) = { add_byte, /* 00 */ or_byte, /* 01 */ adc_byte, /* 02 */ sbb_byte, /* 03 */ and_byte, /* 04 */ sub_byte, /* 05 */ xor_byte, /* 06 */ cmp_byte, /* 07 */ }; /* * REMARKS: * Handles opcode 0x80 */ static void x86emuOp_opc80_byte_RM_IMM(struct x86emu *emu) { uint8_t imm, destval; /* * Weirdo special case instruction format. Part of the opcode * held below in "RH". Doubly nested case would result, except * that the decoded instruction */ fetch_decode_modrm(emu); destval = decode_and_fetch_byte(emu); imm = fetch_byte_imm(emu); destval = (*opc80_byte_operation[emu->cur_rh]) (emu, destval, imm); if (emu->cur_rh != 7) write_back_byte(emu, destval); } static uint16_t(* const opc81_word_operation[]) (struct x86emu *, uint16_t d, uint16_t s) = { add_word, /* 00 */ or_word, /* 01 */ adc_word, /* 02 */ sbb_word, /* 03 */ and_word, /* 04 */ sub_word, /* 05 */ xor_word, /* 06 */ cmp_word, /* 07 */ }; static uint32_t(* const opc81_long_operation[]) (struct x86emu *, uint32_t d, uint32_t s) = { add_long, /* 00 */ or_long, /* 01 */ adc_long, /* 02 */ sbb_long, /* 03 */ and_long, /* 04 */ sub_long, /* 05 */ xor_long, /* 06 */ cmp_long, /* 07 */ }; /* * REMARKS: * Handles opcode 0x81 */ static void x86emuOp32_opc81_word_RM_IMM(struct x86emu *emu) { uint32_t destval, imm; /* * Weirdo special case instruction format. Part of the opcode * held below in "RH". Doubly nested case would result, except * that the decoded instruction */ fetch_decode_modrm(emu); destval = decode_and_fetch_long(emu); imm = fetch_long_imm(emu); destval = (*opc81_long_operation[emu->cur_rh]) (emu, destval, imm); if (emu->cur_rh != 7) write_back_long(emu, destval); } static void x86emuOp16_opc81_word_RM_IMM(struct x86emu *emu) { uint16_t destval, imm; /* * Weirdo special case instruction format. Part of the opcode * held below in "RH". Doubly nested case would result, except * that the decoded instruction */ fetch_decode_modrm(emu); destval = decode_and_fetch_word(emu); imm = fetch_word_imm(emu); destval = (*opc81_word_operation[emu->cur_rh]) (emu, destval, imm); if (emu->cur_rh != 7) write_back_word(emu, destval); } static void x86emuOp_opc81_word_RM_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_opc81_word_RM_IMM(emu); else x86emuOp16_opc81_word_RM_IMM(emu); } static uint8_t(* const opc82_byte_operation[]) (struct x86emu *, uint8_t s, uint8_t d) = { add_byte, /* 00 */ or_byte, /* 01 *//* YYY UNUSED ???? */ adc_byte, /* 02 */ sbb_byte, /* 03 */ and_byte, /* 04 *//* YYY UNUSED ???? */ sub_byte, /* 05 */ xor_byte, /* 06 *//* YYY UNUSED ???? */ cmp_byte, /* 07 */ }; /* * REMARKS: * Handles opcode 0x82 */ static void x86emuOp_opc82_byte_RM_IMM(struct x86emu *emu) { uint8_t imm, destval; /* * Weirdo special case instruction format. Part of the opcode * held below in "RH". Doubly nested case would result, except * that the decoded instruction Similar to opcode 81, except that * the immediate byte is sign extended to a word length. */ fetch_decode_modrm(emu); destval = decode_and_fetch_byte(emu); imm = fetch_byte_imm(emu); destval = (*opc82_byte_operation[emu->cur_rh]) (emu, destval, imm); if (emu->cur_rh != 7) write_back_byte(emu, destval); } static uint16_t(* const opc83_word_operation[]) (struct x86emu *, uint16_t s, uint16_t d) = { add_word, /* 00 */ or_word, /* 01 *//* YYY UNUSED ???? */ adc_word, /* 02 */ sbb_word, /* 03 */ and_word, /* 04 *//* YYY UNUSED ???? */ sub_word, /* 05 */ xor_word, /* 06 *//* YYY UNUSED ???? */ cmp_word, /* 07 */ }; static uint32_t(* const opc83_long_operation[]) (struct x86emu *, uint32_t s, uint32_t d) = { add_long, /* 00 */ or_long, /* 01 *//* YYY UNUSED ???? */ adc_long, /* 02 */ sbb_long, /* 03 */ and_long, /* 04 *//* YYY UNUSED ???? */ sub_long, /* 05 */ xor_long, /* 06 *//* YYY UNUSED ???? */ cmp_long, /* 07 */ }; /* * REMARKS: * Handles opcode 0x83 */ static void x86emuOp32_opc83_word_RM_IMM(struct x86emu *emu) { uint32_t destval, imm; fetch_decode_modrm(emu); destval = decode_and_fetch_long(emu); imm = (int8_t) fetch_byte_imm(emu); destval = (*opc83_long_operation[emu->cur_rh]) (emu, destval, imm); if (emu->cur_rh != 7) write_back_long(emu, destval); } static void x86emuOp16_opc83_word_RM_IMM(struct x86emu *emu) { uint16_t destval, imm; fetch_decode_modrm(emu); destval = decode_and_fetch_word(emu); imm = (int8_t) fetch_byte_imm(emu); destval = (*opc83_word_operation[emu->cur_rh]) (emu, destval, imm); if (emu->cur_rh != 7) write_back_word(emu, destval); } static void x86emuOp_opc83_word_RM_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_opc83_word_RM_IMM(emu); else x86emuOp16_opc83_word_RM_IMM(emu); } /* * REMARKS: * Handles opcode 0x86 */ static void x86emuOp_xchg_byte_RM_R(struct x86emu *emu) { uint8_t *srcreg, destval, tmp; fetch_decode_modrm(emu); destval = decode_and_fetch_byte(emu); srcreg = decode_rh_byte_register(emu); tmp = destval; destval = *srcreg; *srcreg = tmp; write_back_byte(emu, destval); } /* * REMARKS: * Handles opcode 0x87 */ static void x86emuOp32_xchg_word_RM_R(struct x86emu *emu) { uint32_t *srcreg, destval, tmp; fetch_decode_modrm(emu); destval = decode_and_fetch_long(emu); srcreg = decode_rh_long_register(emu); tmp = destval; destval = *srcreg; *srcreg = tmp; write_back_long(emu, destval); } static void x86emuOp16_xchg_word_RM_R(struct x86emu *emu) { uint16_t *srcreg, destval, tmp; fetch_decode_modrm(emu); destval = decode_and_fetch_word(emu); srcreg = decode_rh_word_register(emu); tmp = destval; destval = *srcreg; *srcreg = tmp; write_back_word(emu, destval); } static void x86emuOp_xchg_word_RM_R(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_xchg_word_RM_R(emu); else x86emuOp16_xchg_word_RM_R(emu); } /* * REMARKS: * Handles opcode 0x88 */ static void x86emuOp_mov_byte_RM_R(struct x86emu *emu) { uint8_t *destreg, *srcreg; uint32_t destoffset; fetch_decode_modrm(emu); srcreg = decode_rh_byte_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); store_data_byte(emu, destoffset, *srcreg); } else { destreg = decode_rl_byte_register(emu); *destreg = *srcreg; } } /* * REMARKS: * Handles opcode 0x89 */ static void x86emuOp32_mov_word_RM_R(struct x86emu *emu) { uint32_t destoffset; uint32_t *destreg, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_long_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); store_data_long(emu, destoffset, srcval); } else { destreg = decode_rl_long_register(emu); *destreg = srcval; } } static void x86emuOp16_mov_word_RM_R(struct x86emu *emu) { uint32_t destoffset; uint16_t *destreg, srcval; fetch_decode_modrm(emu); srcval = *decode_rh_word_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); store_data_word(emu, destoffset, srcval); } else { destreg = decode_rl_word_register(emu); *destreg = srcval; } } static void x86emuOp_mov_word_RM_R(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_mov_word_RM_R(emu); else x86emuOp16_mov_word_RM_R(emu); } /* * REMARKS: * Handles opcode 0x8a */ static void x86emuOp_mov_byte_R_RM(struct x86emu *emu) { uint8_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_byte_register(emu); *destreg = decode_and_fetch_byte(emu); } /* * REMARKS: * Handles opcode 0x8b */ static void x86emuOp_mov_word_R_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); *destreg = decode_and_fetch_long(emu); } else { uint16_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); *destreg = decode_and_fetch_word(emu); } } /* * REMARKS: * Handles opcode 0x8c */ static void x86emuOp_mov_word_RM_SR(struct x86emu *emu) { uint16_t *destreg, srcval; uint32_t destoffset; fetch_decode_modrm(emu); srcval = *decode_rh_seg_register(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); store_data_word(emu, destoffset, srcval); } else { destreg = decode_rl_word_register(emu); *destreg = srcval; } } /* * REMARKS: * Handles opcode 0x8d */ static void x86emuOp_lea_word_R_M(struct x86emu *emu) { uint32_t destoffset; fetch_decode_modrm(emu); if (emu->cur_mod == 3) x86emu_halt_sys(emu); destoffset = decode_rl_address(emu); if (emu->x86.mode & SYSMODE_PREFIX_ADDR) { uint32_t *srcreg; srcreg = decode_rh_long_register(emu); *srcreg = (uint32_t) destoffset; } else { uint16_t *srcreg; srcreg = decode_rh_word_register(emu); *srcreg = (uint16_t) destoffset; } } /* * REMARKS: * Handles opcode 0x8e */ static void x86emuOp_mov_word_SR_RM(struct x86emu *emu) { uint16_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_seg_register(emu); *destreg = decode_and_fetch_word(emu); /* * Clean up, and reset all the R_xSP pointers to the correct * locations. This is about 3x too much overhead (doing all the * segreg ptrs when only one is needed, but this instruction * *cannot* be that common, and this isn't too much work anyway. */ } /* * REMARKS: * Handles opcode 0x8f */ static void x86emuOp32_pop_RM(struct x86emu *emu) { uint32_t destoffset; uint32_t destval, *destreg; fetch_decode_modrm(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = pop_long(emu); store_data_long(emu, destoffset, destval); } else { destreg = decode_rl_long_register(emu); *destreg = pop_long(emu); } } static void x86emuOp16_pop_RM(struct x86emu *emu) { uint32_t destoffset; uint16_t destval, *destreg; fetch_decode_modrm(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = pop_word(emu); store_data_word(emu, destoffset, destval); } else { destreg = decode_rl_word_register(emu); *destreg = pop_word(emu); } } static void x86emuOp_pop_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_pop_RM(emu); else x86emuOp16_pop_RM(emu); } /* * REMARKS: * Handles opcode 0x91 */ static void x86emuOp_xchg_word_AX_CX(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_ECX; emu->x86.R_ECX = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_CX; emu->x86.R_CX = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x92 */ static void x86emuOp_xchg_word_AX_DX(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_EDX; emu->x86.R_EDX = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_DX; emu->x86.R_DX = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x93 */ static void x86emuOp_xchg_word_AX_BX(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_EBX; emu->x86.R_EBX = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_BX; emu->x86.R_BX = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x94 */ static void x86emuOp_xchg_word_AX_SP(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_ESP; emu->x86.R_ESP = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_SP; emu->x86.R_SP = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x95 */ static void x86emuOp_xchg_word_AX_BP(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_EBP; emu->x86.R_EBP = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_BP; emu->x86.R_BP = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x96 */ static void x86emuOp_xchg_word_AX_SI(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_ESI; emu->x86.R_ESI = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_SI; emu->x86.R_SI = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x97 */ static void x86emuOp_xchg_word_AX_DI(struct x86emu *emu) { uint32_t tmp; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { tmp = emu->x86.R_EAX; emu->x86.R_EAX = emu->x86.R_EDI; emu->x86.R_EDI = tmp; } else { tmp = emu->x86.R_AX; emu->x86.R_AX = emu->x86.R_DI; emu->x86.R_DI = (uint16_t) tmp; } } /* * REMARKS: * Handles opcode 0x98 */ static void x86emuOp_cbw(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { if (emu->x86.R_AX & 0x8000) { emu->x86.R_EAX |= 0xffff0000; } else { emu->x86.R_EAX &= 0x0000ffff; } } else { if (emu->x86.R_AL & 0x80) { emu->x86.R_AH = 0xff; } else { emu->x86.R_AH = 0x0; } } } /* * REMARKS: * Handles opcode 0x99 */ static void x86emuOp_cwd(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { if (emu->x86.R_EAX & 0x80000000) { emu->x86.R_EDX = 0xffffffff; } else { emu->x86.R_EDX = 0x0; } } else { if (emu->x86.R_AX & 0x8000) { emu->x86.R_DX = 0xffff; } else { emu->x86.R_DX = 0x0; } } } /* * REMARKS: * Handles opcode 0x9a */ static void x86emuOp_call_far_IMM(struct x86emu *emu) { uint16_t farseg, faroff; faroff = fetch_word_imm(emu); farseg = fetch_word_imm(emu); /* XXX * * Hooked interrupt vectors calling into our "BIOS" will cause problems * unless all intersegment stuff is checked for BIOS access. Check * needed here. For moment, let it alone. */ push_word(emu, emu->x86.R_CS); emu->x86.R_CS = farseg; push_word(emu, emu->x86.R_IP); emu->x86.R_IP = faroff; } /* * REMARKS: * Handles opcode 0x9c */ static void x86emuOp_pushf_word(struct x86emu *emu) { uint32_t flags; /* clear out *all* bits not representing flags, and turn on real bits */ flags = (emu->x86.R_EFLG & F_MSK) | F_ALWAYS_ON; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { push_long(emu, flags); } else { push_word(emu, (uint16_t) flags); } } /* * REMARKS: * Handles opcode 0x9d */ static void x86emuOp_popf_word(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_EFLG = pop_long(emu); } else { emu->x86.R_FLG = pop_word(emu); } } /* * REMARKS: * Handles opcode 0x9e */ static void x86emuOp_sahf(struct x86emu *emu) { /* clear the lower bits of the flag register */ emu->x86.R_FLG &= 0xffffff00; /* or in the AH register into the flags register */ emu->x86.R_FLG |= emu->x86.R_AH; } /* * REMARKS: * Handles opcode 0x9f */ static void x86emuOp_lahf(struct x86emu *emu) { emu->x86.R_AH = (uint8_t) (emu->x86.R_FLG & 0xff); /* undocumented TC++ behavior??? Nope. It's documented, but you have * too look real hard to notice it. */ emu->x86.R_AH |= 0x2; } /* * REMARKS: * Handles opcode 0xa0 */ static void x86emuOp_mov_AL_M_IMM(struct x86emu *emu) { uint16_t offset; offset = fetch_word_imm(emu); emu->x86.R_AL = fetch_data_byte(emu, offset); } /* * REMARKS: * Handles opcode 0xa1 */ static void x86emuOp_mov_AX_M_IMM(struct x86emu *emu) { uint16_t offset; offset = fetch_word_imm(emu); if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_EAX = fetch_data_long(emu, offset); } else { emu->x86.R_AX = fetch_data_word(emu, offset); } } /* * REMARKS: * Handles opcode 0xa2 */ static void x86emuOp_mov_M_AL_IMM(struct x86emu *emu) { uint16_t offset; offset = fetch_word_imm(emu); store_data_byte(emu, offset, emu->x86.R_AL); } /* * REMARKS: * Handles opcode 0xa3 */ static void x86emuOp_mov_M_AX_IMM(struct x86emu *emu) { uint16_t offset; offset = fetch_word_imm(emu); if (emu->x86.mode & SYSMODE_PREFIX_DATA) { store_data_long(emu, offset, emu->x86.R_EAX); } else { store_data_word(emu, offset, emu->x86.R_AX); } } /* * REMARKS: * Handles opcode 0xa4 */ static void x86emuOp_movs_byte(struct x86emu *emu) { uint8_t val; uint32_t count; int inc; if (ACCESS_FLAG(F_DF)) /* down */ inc = -1; else inc = 1; count = 1; if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* move them until CX is ZERO. */ count = emu->x86.R_CX; emu->x86.R_CX = 0; emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } while (count--) { val = fetch_data_byte(emu, emu->x86.R_SI); store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, val); emu->x86.R_SI += inc; emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xa5 */ static void x86emuOp_movs_word(struct x86emu *emu) { uint32_t val; int inc; uint32_t count; if (emu->x86.mode & SYSMODE_PREFIX_DATA) inc = 4; else inc = 2; if (ACCESS_FLAG(F_DF)) /* down */ inc = -inc; count = 1; if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* move them until CX is ZERO. */ count = emu->x86.R_CX; emu->x86.R_CX = 0; emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } while (count--) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val = fetch_data_long(emu, emu->x86.R_SI); store_long(emu, emu->x86.R_ES, emu->x86.R_DI, val); } else { val = fetch_data_word(emu, emu->x86.R_SI); store_word(emu, emu->x86.R_ES, emu->x86.R_DI, (uint16_t) val); } emu->x86.R_SI += inc; emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xa6 */ static void x86emuOp_cmps_byte(struct x86emu *emu) { int8_t val1, val2; int inc; if (ACCESS_FLAG(F_DF)) /* down */ inc = -1; else inc = 1; if (emu->x86.mode & SYSMODE_PREFIX_REPE) { /* REPE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { val1 = fetch_data_byte(emu, emu->x86.R_SI); val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_byte(emu, val1, val2); emu->x86.R_CX -= 1; emu->x86.R_SI += inc; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF) == 0) break; } emu->x86.mode &= ~SYSMODE_PREFIX_REPE; } else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) { /* REPNE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { val1 = fetch_data_byte(emu, emu->x86.R_SI); val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_byte(emu, val1, val2); emu->x86.R_CX -= 1; emu->x86.R_SI += inc; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF)) break; /* zero flag set means equal */ } emu->x86.mode &= ~SYSMODE_PREFIX_REPNE; } else { val1 = fetch_data_byte(emu, emu->x86.R_SI); val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_byte(emu, val1, val2); emu->x86.R_SI += inc; emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xa7 */ static void x86emuOp_cmps_word(struct x86emu *emu) { uint32_t val1, val2; int inc; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { if (ACCESS_FLAG(F_DF)) /* down */ inc = -4; else inc = 4; } else { if (ACCESS_FLAG(F_DF)) /* down */ inc = -2; else inc = 2; } if (emu->x86.mode & SYSMODE_PREFIX_REPE) { /* REPE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val1 = fetch_data_long(emu, emu->x86.R_SI); val2 = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_long(emu, val1, val2); } else { val1 = fetch_data_word(emu, emu->x86.R_SI); val2 = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_word(emu, (uint16_t) val1, (uint16_t) val2); } emu->x86.R_CX -= 1; emu->x86.R_SI += inc; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF) == 0) break; } emu->x86.mode &= ~SYSMODE_PREFIX_REPE; } else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) { /* REPNE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val1 = fetch_data_long(emu, emu->x86.R_SI); val2 = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_long(emu, val1, val2); } else { val1 = fetch_data_word(emu, emu->x86.R_SI); val2 = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_word(emu, (uint16_t) val1, (uint16_t) val2); } emu->x86.R_CX -= 1; emu->x86.R_SI += inc; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF)) break; /* zero flag set means equal */ } emu->x86.mode &= ~SYSMODE_PREFIX_REPNE; } else { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val1 = fetch_data_long(emu, emu->x86.R_SI); val2 = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_long(emu, val1, val2); } else { val1 = fetch_data_word(emu, emu->x86.R_SI); val2 = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_word(emu, (uint16_t) val1, (uint16_t) val2); } emu->x86.R_SI += inc; emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xa9 */ static void x86emuOp_test_AX_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { test_long(emu, emu->x86.R_EAX, fetch_long_imm(emu)); } else { test_word(emu, emu->x86.R_AX, fetch_word_imm(emu)); } } /* * REMARKS: * Handles opcode 0xaa */ static void x86emuOp_stos_byte(struct x86emu *emu) { int inc; if (ACCESS_FLAG(F_DF)) /* down */ inc = -1; else inc = 1; if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, emu->x86.R_AL); emu->x86.R_CX -= 1; emu->x86.R_DI += inc; } emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } else { store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, emu->x86.R_AL); emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xab */ static void x86emuOp_stos_word(struct x86emu *emu) { int inc; uint32_t count; if (emu->x86.mode & SYSMODE_PREFIX_DATA) inc = 4; else inc = 2; if (ACCESS_FLAG(F_DF)) /* down */ inc = -inc; count = 1; if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* move them until CX is ZERO. */ count = emu->x86.R_CX; emu->x86.R_CX = 0; emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } while (count--) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { store_long(emu, emu->x86.R_ES, emu->x86.R_DI, emu->x86.R_EAX); } else { store_word(emu, emu->x86.R_ES, emu->x86.R_DI, emu->x86.R_AX); } emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xac */ static void x86emuOp_lods_byte(struct x86emu *emu) { int inc; if (ACCESS_FLAG(F_DF)) /* down */ inc = -1; else inc = 1; if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { emu->x86.R_AL = fetch_data_byte(emu, emu->x86.R_SI); emu->x86.R_CX -= 1; emu->x86.R_SI += inc; } emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } else { emu->x86.R_AL = fetch_data_byte(emu, emu->x86.R_SI); emu->x86.R_SI += inc; } } /* * REMARKS: * Handles opcode 0xad */ static void x86emuOp_lods_word(struct x86emu *emu) { int inc; uint32_t count; if (emu->x86.mode & SYSMODE_PREFIX_DATA) inc = 4; else inc = 2; if (ACCESS_FLAG(F_DF)) /* down */ inc = -inc; count = 1; if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* move them until CX is ZERO. */ count = emu->x86.R_CX; emu->x86.R_CX = 0; emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } while (count--) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_EAX = fetch_data_long(emu, emu->x86.R_SI); } else { emu->x86.R_AX = fetch_data_word(emu, emu->x86.R_SI); } emu->x86.R_SI += inc; } } /* * REMARKS: * Handles opcode 0xae */ static void x86emuOp_scas_byte(struct x86emu *emu) { int8_t val2; int inc; if (ACCESS_FLAG(F_DF)) /* down */ inc = -1; else inc = 1; if (emu->x86.mode & SYSMODE_PREFIX_REPE) { /* REPE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_byte(emu, emu->x86.R_AL, val2); emu->x86.R_CX -= 1; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF) == 0) break; } emu->x86.mode &= ~SYSMODE_PREFIX_REPE; } else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) { /* REPNE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_byte(emu, emu->x86.R_AL, val2); emu->x86.R_CX -= 1; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF)) break; /* zero flag set means equal */ } emu->x86.mode &= ~SYSMODE_PREFIX_REPNE; } else { val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_byte(emu, emu->x86.R_AL, val2); emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xaf */ static void x86emuOp_scas_word(struct x86emu *emu) { int inc; uint32_t val; if (emu->x86.mode & SYSMODE_PREFIX_DATA) inc = 4; else inc = 2; if (ACCESS_FLAG(F_DF)) /* down */ inc = -inc; if (emu->x86.mode & SYSMODE_PREFIX_REPE) { /* REPE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_long(emu, emu->x86.R_EAX, val); } else { val = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_word(emu, emu->x86.R_AX, (uint16_t) val); } emu->x86.R_CX -= 1; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF) == 0) break; } emu->x86.mode &= ~SYSMODE_PREFIX_REPE; } else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) { /* REPNE */ /* move them until CX is ZERO. */ while (emu->x86.R_CX != 0) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_long(emu, emu->x86.R_EAX, val); } else { val = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_word(emu, emu->x86.R_AX, (uint16_t) val); } emu->x86.R_CX -= 1; emu->x86.R_DI += inc; if (ACCESS_FLAG(F_ZF)) break; /* zero flag set means equal */ } emu->x86.mode &= ~SYSMODE_PREFIX_REPNE; } else { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { val = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_long(emu, emu->x86.R_EAX, val); } else { val = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI); cmp_word(emu, emu->x86.R_AX, (uint16_t) val); } emu->x86.R_DI += inc; } } /* * REMARKS: * Handles opcode 0xb8 */ static void x86emuOp_mov_word_AX_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_EAX = fetch_long_imm(emu); else emu->x86.R_AX = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xb9 */ static void x86emuOp_mov_word_CX_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_ECX = fetch_long_imm(emu); else emu->x86.R_CX = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xba */ static void x86emuOp_mov_word_DX_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_EDX = fetch_long_imm(emu); else emu->x86.R_DX = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xbb */ static void x86emuOp_mov_word_BX_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_EBX = fetch_long_imm(emu); else emu->x86.R_BX = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xbc */ static void x86emuOp_mov_word_SP_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_ESP = fetch_long_imm(emu); else emu->x86.R_SP = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xbd */ static void x86emuOp_mov_word_BP_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_EBP = fetch_long_imm(emu); else emu->x86.R_BP = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xbe */ static void x86emuOp_mov_word_SI_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_ESI = fetch_long_imm(emu); else emu->x86.R_SI = fetch_word_imm(emu); } /* * REMARKS: * Handles opcode 0xbf */ static void x86emuOp_mov_word_DI_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) emu->x86.R_EDI = fetch_long_imm(emu); else emu->x86.R_DI = fetch_word_imm(emu); } /* used by opcodes c0, d0, and d2. */ static uint8_t(* const opcD0_byte_operation[]) (struct x86emu *, uint8_t d, uint8_t s) = { rol_byte, ror_byte, rcl_byte, rcr_byte, shl_byte, shr_byte, shl_byte, /* sal_byte === shl_byte by definition */ sar_byte, }; /* * REMARKS: * Handles opcode 0xc0 */ static void x86emuOp_opcC0_byte_RM_MEM(struct x86emu *emu) { uint8_t destval, amt; /* * Yet another weirdo special case instruction format. Part of * the opcode held below in "RH". Doubly nested case would * result, except that the decoded instruction */ fetch_decode_modrm(emu); /* know operation, decode the mod byte to find the addressing mode. */ destval = decode_and_fetch_byte_imm8(emu, &amt); destval = (*opcD0_byte_operation[emu->cur_rh]) (emu, destval, amt); write_back_byte(emu, destval); } /* used by opcodes c1, d1, and d3. */ static uint16_t(* const opcD1_word_operation[]) (struct x86emu *, uint16_t s, uint8_t d) = { rol_word, ror_word, rcl_word, rcr_word, shl_word, shr_word, shl_word, /* sal_byte === shl_byte by definition */ sar_word, }; /* used by opcodes c1, d1, and d3. */ static uint32_t(* const opcD1_long_operation[]) (struct x86emu *, uint32_t s, uint8_t d) = { rol_long, ror_long, rcl_long, rcr_long, shl_long, shr_long, shl_long, /* sal_byte === shl_byte by definition */ sar_long, }; /* * REMARKS: * Handles opcode 0xc1 */ static void x86emuOp_opcC1_word_RM_MEM(struct x86emu *emu) { uint8_t amt; /* * Yet another weirdo special case instruction format. Part of * the opcode held below in "RH". Doubly nested case would * result, except that the decoded instruction */ fetch_decode_modrm(emu); if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t destval; destval = decode_and_fetch_long_imm8(emu, &amt); destval = (*opcD1_long_operation[emu->cur_rh]) (emu, destval, amt); write_back_long(emu, destval); } else { uint16_t destval; destval = decode_and_fetch_word_imm8(emu, &amt); destval = (*opcD1_word_operation[emu->cur_rh]) (emu, destval, amt); write_back_word(emu, destval); } } /* * REMARKS: * Handles opcode 0xc2 */ static void x86emuOp_ret_near_IMM(struct x86emu *emu) { uint16_t imm; imm = fetch_word_imm(emu); emu->x86.R_IP = pop_word(emu); emu->x86.R_SP += imm; } /* * REMARKS: * Handles opcode 0xc6 */ static void x86emuOp_mov_byte_RM_IMM(struct x86emu *emu) { uint8_t *destreg; uint32_t destoffset; uint8_t imm; fetch_decode_modrm(emu); if (emu->cur_rh != 0) x86emu_halt_sys(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); imm = fetch_byte_imm(emu); store_data_byte(emu, destoffset, imm); } else { destreg = decode_rl_byte_register(emu); imm = fetch_byte_imm(emu); *destreg = imm; } } /* * REMARKS: * Handles opcode 0xc7 */ static void x86emuOp32_mov_word_RM_IMM(struct x86emu *emu) { uint32_t destoffset; uint32_t imm, *destreg; fetch_decode_modrm(emu); if (emu->cur_rh != 0) x86emu_halt_sys(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); imm = fetch_long_imm(emu); store_data_long(emu, destoffset, imm); } else { destreg = decode_rl_long_register(emu); imm = fetch_long_imm(emu); *destreg = imm; } } static void x86emuOp16_mov_word_RM_IMM(struct x86emu *emu) { uint32_t destoffset; uint16_t imm, *destreg; fetch_decode_modrm(emu); if (emu->cur_rh != 0) x86emu_halt_sys(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); imm = fetch_word_imm(emu); store_data_word(emu, destoffset, imm); } else { destreg = decode_rl_word_register(emu); imm = fetch_word_imm(emu); *destreg = imm; } } static void x86emuOp_mov_word_RM_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_mov_word_RM_IMM(emu); else x86emuOp16_mov_word_RM_IMM(emu); } /* * REMARKS: * Handles opcode 0xc8 */ static void x86emuOp_enter(struct x86emu *emu) { uint16_t local, frame_pointer; uint8_t nesting; int i; local = fetch_word_imm(emu); nesting = fetch_byte_imm(emu); push_word(emu, emu->x86.R_BP); frame_pointer = emu->x86.R_SP; if (nesting > 0) { for (i = 1; i < nesting; i++) { emu->x86.R_BP -= 2; push_word(emu, fetch_word(emu, emu->x86.R_SS, emu->x86.R_BP)); } push_word(emu, frame_pointer); } emu->x86.R_BP = frame_pointer; emu->x86.R_SP = (uint16_t) (emu->x86.R_SP - local); } /* * REMARKS: * Handles opcode 0xc9 */ static void x86emuOp_leave(struct x86emu *emu) { emu->x86.R_SP = emu->x86.R_BP; emu->x86.R_BP = pop_word(emu); } /* * REMARKS: * Handles opcode 0xca */ static void x86emuOp_ret_far_IMM(struct x86emu *emu) { uint16_t imm; imm = fetch_word_imm(emu); emu->x86.R_IP = pop_word(emu); emu->x86.R_CS = pop_word(emu); emu->x86.R_SP += imm; } /* * REMARKS: * Handles opcode 0xcb */ static void x86emuOp_ret_far(struct x86emu *emu) { emu->x86.R_IP = pop_word(emu); emu->x86.R_CS = pop_word(emu); } /* * REMARKS: * Handles opcode 0xcc */ static void x86emuOp_int3(struct x86emu *emu) { x86emu_intr_dispatch(emu, 3); } /* * REMARKS: * Handles opcode 0xcd */ static void x86emuOp_int_IMM(struct x86emu *emu) { uint8_t intnum; intnum = fetch_byte_imm(emu); x86emu_intr_dispatch(emu, intnum); } /* * REMARKS: * Handles opcode 0xce */ static void x86emuOp_into(struct x86emu *emu) { if (ACCESS_FLAG(F_OF)) x86emu_intr_dispatch(emu, 4); } /* * REMARKS: * Handles opcode 0xcf */ static void x86emuOp_iret(struct x86emu *emu) { emu->x86.R_IP = pop_word(emu); emu->x86.R_CS = pop_word(emu); emu->x86.R_FLG = pop_word(emu); } /* * REMARKS: * Handles opcode 0xd0 */ static void x86emuOp_opcD0_byte_RM_1(struct x86emu *emu) { uint8_t destval; fetch_decode_modrm(emu); destval = decode_and_fetch_byte(emu); destval = (*opcD0_byte_operation[emu->cur_rh]) (emu, destval, 1); write_back_byte(emu, destval); } /* * REMARKS: * Handles opcode 0xd1 */ static void x86emuOp_opcD1_word_RM_1(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t destval; fetch_decode_modrm(emu); destval = decode_and_fetch_long(emu); destval = (*opcD1_long_operation[emu->cur_rh])(emu, destval, 1); write_back_long(emu, destval); } else { uint16_t destval; fetch_decode_modrm(emu); destval = decode_and_fetch_word(emu); destval = (*opcD1_word_operation[emu->cur_rh])(emu, destval, 1); write_back_word(emu, destval); } } /* * REMARKS: * Handles opcode 0xd2 */ static void x86emuOp_opcD2_byte_RM_CL(struct x86emu *emu) { uint8_t destval; fetch_decode_modrm(emu); destval = decode_and_fetch_byte(emu); destval = (*opcD0_byte_operation[emu->cur_rh]) (emu, destval, emu->x86.R_CL); write_back_byte(emu, destval); } /* * REMARKS: * Handles opcode 0xd3 */ static void x86emuOp_opcD3_word_RM_CL(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { uint32_t destval; fetch_decode_modrm(emu); destval = decode_and_fetch_long(emu); destval = (*opcD1_long_operation[emu->cur_rh]) (emu, destval, emu->x86.R_CL); write_back_long(emu, destval); } else { uint16_t destval; fetch_decode_modrm(emu); destval = decode_and_fetch_word(emu); destval = (*opcD1_word_operation[emu->cur_rh]) (emu, destval, emu->x86.R_CL); write_back_word(emu, destval); } } /* * REMARKS: * Handles opcode 0xd4 */ static void x86emuOp_aam(struct x86emu *emu) { uint8_t a; a = fetch_byte_imm(emu); /* this is a stupid encoding. */ if (a != 10) { /* fix: add base decoding aam_word(uint8_t val, int base a) */ x86emu_halt_sys(emu); } /* note the type change here --- returning AL and AH in AX. */ emu->x86.R_AX = aam_word(emu, emu->x86.R_AL); } /* * REMARKS: * Handles opcode 0xd5 */ static void x86emuOp_aad(struct x86emu *emu) { uint8_t a; a = fetch_byte_imm(emu); if (a != 10) { /* fix: add base decoding aad_word(uint16_t val, int base a) */ x86emu_halt_sys(emu); } emu->x86.R_AX = aad_word(emu, emu->x86.R_AX); } /* opcode 0xd6 ILLEGAL OPCODE */ /* * REMARKS: * Handles opcode 0xd7 */ static void x86emuOp_xlat(struct x86emu *emu) { uint16_t addr; addr = (uint16_t) (emu->x86.R_BX + (uint8_t) emu->x86.R_AL); emu->x86.R_AL = fetch_data_byte(emu, addr); } /* opcode=0xd8 */ static void x86emuOp_esc_coprocess_d8(struct x86emu *emu) { } /* opcode=0xd9 */ static void x86emuOp_esc_coprocess_d9(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* opcode=0xda */ static void x86emuOp_esc_coprocess_da(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* opcode=0xdb */ static void x86emuOp_esc_coprocess_db(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* opcode=0xdc */ static void x86emuOp_esc_coprocess_dc(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* opcode=0xdd */ static void x86emuOp_esc_coprocess_dd(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* opcode=0xde */ static void x86emuOp_esc_coprocess_de(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* opcode=0xdf */ static void x86emuOp_esc_coprocess_df(struct x86emu *emu) { fetch_decode_modrm(emu); if (emu->cur_mod != 3) decode_rl_address(emu); } /* * REMARKS: * Handles opcode 0xe0 */ static void x86emuOp_loopne(struct x86emu *emu) { int16_t ip; ip = (int8_t) fetch_byte_imm(emu); ip += (int16_t) emu->x86.R_IP; emu->x86.R_CX -= 1; if (emu->x86.R_CX != 0 && !ACCESS_FLAG(F_ZF)) /* CX != 0 and !ZF */ emu->x86.R_IP = ip; } /* * REMARKS: * Handles opcode 0xe1 */ static void x86emuOp_loope(struct x86emu *emu) { int16_t ip; ip = (int8_t) fetch_byte_imm(emu); ip += (int16_t) emu->x86.R_IP; emu->x86.R_CX -= 1; if (emu->x86.R_CX != 0 && ACCESS_FLAG(F_ZF)) /* CX != 0 and ZF */ emu->x86.R_IP = ip; } /* * REMARKS: * Handles opcode 0xe2 */ static void x86emuOp_loop(struct x86emu *emu) { int16_t ip; ip = (int8_t) fetch_byte_imm(emu); ip += (int16_t) emu->x86.R_IP; emu->x86.R_CX -= 1; if (emu->x86.R_CX != 0) emu->x86.R_IP = ip; } /* * REMARKS: * Handles opcode 0xe3 */ static void x86emuOp_jcxz(struct x86emu *emu) { uint16_t target; int8_t offset; /* jump to byte offset if overflow flag is set */ offset = (int8_t) fetch_byte_imm(emu); target = (uint16_t) (emu->x86.R_IP + offset); if (emu->x86.R_CX == 0) emu->x86.R_IP = target; } /* * REMARKS: * Handles opcode 0xe4 */ static void x86emuOp_in_byte_AL_IMM(struct x86emu *emu) { uint8_t port; port = (uint8_t) fetch_byte_imm(emu); emu->x86.R_AL = (*emu->emu_inb) (emu, port); } /* * REMARKS: * Handles opcode 0xe5 */ static void x86emuOp_in_word_AX_IMM(struct x86emu *emu) { uint8_t port; port = (uint8_t) fetch_byte_imm(emu); if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_EAX = (*emu->emu_inl) (emu, port); } else { emu->x86.R_AX = (*emu->emu_inw) (emu, port); } } /* * REMARKS: * Handles opcode 0xe6 */ static void x86emuOp_out_byte_IMM_AL(struct x86emu *emu) { uint8_t port; port = (uint8_t) fetch_byte_imm(emu); (*emu->emu_outb) (emu, port, emu->x86.R_AL); } /* * REMARKS: * Handles opcode 0xe7 */ static void x86emuOp_out_word_IMM_AX(struct x86emu *emu) { uint8_t port; port = (uint8_t) fetch_byte_imm(emu); if (emu->x86.mode & SYSMODE_PREFIX_DATA) { (*emu->emu_outl) (emu, port, emu->x86.R_EAX); } else { (*emu->emu_outw) (emu, port, emu->x86.R_AX); } } /* * REMARKS: * Handles opcode 0xe8 */ static void x86emuOp_call_near_IMM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { int32_t ip; ip = (int32_t) fetch_long_imm(emu); ip += (int32_t) emu->x86.R_EIP; push_long(emu, emu->x86.R_EIP); emu->x86.R_EIP = ip; } else { int16_t ip; ip = (int16_t) fetch_word_imm(emu); ip += (int16_t) emu->x86.R_IP; /* CHECK SIGN */ push_word(emu, emu->x86.R_IP); emu->x86.R_IP = ip; } } /* * REMARKS: * Handles opcode 0xe9 */ static void x86emuOp_jump_near_IMM(struct x86emu *emu) { int ip; ip = (int16_t) fetch_word_imm(emu); ip += (int16_t) emu->x86.R_IP; emu->x86.R_IP = (uint16_t) ip; } /* * REMARKS: * Handles opcode 0xea */ static void x86emuOp_jump_far_IMM(struct x86emu *emu) { uint16_t cs, ip; ip = fetch_word_imm(emu); cs = fetch_word_imm(emu); emu->x86.R_IP = ip; emu->x86.R_CS = cs; } /* * REMARKS: * Handles opcode 0xeb */ static void x86emuOp_jump_byte_IMM(struct x86emu *emu) { uint16_t target; int8_t offset; offset = (int8_t) fetch_byte_imm(emu); target = (uint16_t) (emu->x86.R_IP + offset); emu->x86.R_IP = target; } /* * REMARKS: * Handles opcode 0xec */ static void x86emuOp_in_byte_AL_DX(struct x86emu *emu) { emu->x86.R_AL = (*emu->emu_inb) (emu, emu->x86.R_DX); } /* * REMARKS: * Handles opcode 0xed */ static void x86emuOp_in_word_AX_DX(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_EAX = (*emu->emu_inl) (emu, emu->x86.R_DX); } else { emu->x86.R_AX = (*emu->emu_inw) (emu, emu->x86.R_DX); } } /* * REMARKS: * Handles opcode 0xee */ static void x86emuOp_out_byte_DX_AL(struct x86emu *emu) { (*emu->emu_outb) (emu, emu->x86.R_DX, emu->x86.R_AL); } /* * REMARKS: * Handles opcode 0xef */ static void x86emuOp_out_word_DX_AX(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) { (*emu->emu_outl) (emu, emu->x86.R_DX, emu->x86.R_EAX); } else { (*emu->emu_outw) (emu, emu->x86.R_DX, emu->x86.R_AX); } } /* * REMARKS: * Handles opcode 0xf0 */ static void x86emuOp_lock(struct x86emu *emu) { } /*opcode 0xf1 ILLEGAL OPERATION */ /* * REMARKS: * Handles opcode 0xf5 */ static void x86emuOp_cmc(struct x86emu *emu) { if (ACCESS_FLAG(F_CF)) CLEAR_FLAG(F_CF); else SET_FLAG(F_CF); } /* * REMARKS: * Handles opcode 0xf6 */ static void x86emuOp_opcF6_byte_RM(struct x86emu *emu) { uint8_t destval, srcval; /* long, drawn out code follows. Double switch for a total of 32 * cases. */ fetch_decode_modrm(emu); if (emu->cur_rh == 1) x86emu_halt_sys(emu); if (emu->cur_rh == 0) { destval = decode_and_fetch_byte_imm8(emu, &srcval); test_byte(emu, destval, srcval); return; } destval = decode_and_fetch_byte(emu); switch (emu->cur_rh) { case 2: destval = ~destval; write_back_byte(emu, destval); break; case 3: destval = neg_byte(emu, destval); write_back_byte(emu, destval); break; case 4: mul_byte(emu, destval); break; case 5: imul_byte(emu, destval); break; case 6: div_byte(emu, destval); break; case 7: idiv_byte(emu, destval); break; } } /* * REMARKS: * Handles opcode 0xf7 */ static void x86emuOp32_opcF7_word_RM(struct x86emu *emu) { uint32_t destval, srcval; /* long, drawn out code follows. Double switch for a total of 32 * cases. */ fetch_decode_modrm(emu); if (emu->cur_rh == 1) x86emu_halt_sys(emu); if (emu->cur_rh == 0) { if (emu->cur_mod != 3) { uint32_t destoffset; destoffset = decode_rl_address(emu); srcval = fetch_long_imm(emu); destval = fetch_data_long(emu, destoffset); } else { srcval = fetch_long_imm(emu); destval = *decode_rl_long_register(emu); } test_long(emu, destval, srcval); return; } destval = decode_and_fetch_long(emu); switch (emu->cur_rh) { case 2: destval = ~destval; write_back_long(emu, destval); break; case 3: destval = neg_long(emu, destval); write_back_long(emu, destval); break; case 4: mul_long(emu, destval); break; case 5: imul_long(emu, destval); break; case 6: div_long(emu, destval); break; case 7: idiv_long(emu, destval); break; } } static void x86emuOp16_opcF7_word_RM(struct x86emu *emu) { uint16_t destval, srcval; /* long, drawn out code follows. Double switch for a total of 32 * cases. */ fetch_decode_modrm(emu); if (emu->cur_rh == 1) x86emu_halt_sys(emu); if (emu->cur_rh == 0) { if (emu->cur_mod != 3) { uint32_t destoffset; destoffset = decode_rl_address(emu); srcval = fetch_word_imm(emu); destval = fetch_data_word(emu, destoffset); } else { srcval = fetch_word_imm(emu); destval = *decode_rl_word_register(emu); } test_word(emu, destval, srcval); return; } destval = decode_and_fetch_word(emu); switch (emu->cur_rh) { case 2: destval = ~destval; write_back_word(emu, destval); break; case 3: destval = neg_word(emu, destval); write_back_word(emu, destval); break; case 4: mul_word(emu, destval); break; case 5: imul_word(emu, destval); break; case 6: div_word(emu, destval); break; case 7: idiv_word(emu, destval); break; } } static void x86emuOp_opcF7_word_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_opcF7_word_RM(emu); else x86emuOp16_opcF7_word_RM(emu); } /* * REMARKS: * Handles opcode 0xfe */ static void x86emuOp_opcFE_byte_RM(struct x86emu *emu) { uint8_t destval; uint32_t destoffset; uint8_t *destreg; /* Yet another special case instruction. */ fetch_decode_modrm(emu); if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); switch (emu->cur_rh) { case 0: /* inc word ptr ... */ destval = fetch_data_byte(emu, destoffset); destval = inc_byte(emu, destval); store_data_byte(emu, destoffset, destval); break; case 1: /* dec word ptr ... */ destval = fetch_data_byte(emu, destoffset); destval = dec_byte(emu, destval); store_data_byte(emu, destoffset, destval); break; } } else { destreg = decode_rl_byte_register(emu); switch (emu->cur_rh) { case 0: *destreg = inc_byte(emu, *destreg); break; case 1: *destreg = dec_byte(emu, *destreg); break; } } } /* * REMARKS: * Handles opcode 0xff */ static void x86emuOp32_opcFF_word_RM(struct x86emu *emu) { uint32_t destoffset = 0; uint32_t destval, *destreg; if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_long(emu, destoffset); switch (emu->cur_rh) { case 0: /* inc word ptr ... */ destval = inc_long(emu, destval); store_data_long(emu, destoffset, destval); break; case 1: /* dec word ptr ... */ destval = dec_long(emu, destval); store_data_long(emu, destoffset, destval); break; case 6: /* push word ptr ... */ push_long(emu, destval); break; } } else { destreg = decode_rl_long_register(emu); switch (emu->cur_rh) { case 0: *destreg = inc_long(emu, *destreg); break; case 1: *destreg = dec_long(emu, *destreg); break; case 6: push_long(emu, *destreg); break; } } } static void x86emuOp16_opcFF_word_RM(struct x86emu *emu) { uint32_t destoffset = 0; uint16_t *destreg; uint16_t destval; if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_word(emu, destoffset); switch (emu->cur_rh) { case 0: destval = inc_word(emu, destval); store_data_word(emu, destoffset, destval); break; case 1: /* dec word ptr ... */ destval = dec_word(emu, destval); store_data_word(emu, destoffset, destval); break; case 6: /* push word ptr ... */ push_word(emu, destval); break; } } else { destreg = decode_rl_word_register(emu); switch (emu->cur_rh) { case 0: *destreg = inc_word(emu, *destreg); break; case 1: *destreg = dec_word(emu, *destreg); break; case 6: push_word(emu, *destreg); break; } } } static void x86emuOp_opcFF_word_RM(struct x86emu *emu) { uint32_t destoffset = 0; uint16_t destval, destval2; /* Yet another special case instruction. */ fetch_decode_modrm(emu); if ((emu->cur_mod == 3 && (emu->cur_rh == 3 || emu->cur_rh == 5)) || emu->cur_rh == 7) x86emu_halt_sys(emu); if (emu->cur_rh == 0 || emu->cur_rh == 1 || emu->cur_rh == 6) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp32_opcFF_word_RM(emu); else x86emuOp16_opcFF_word_RM(emu); return; } if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); destval = fetch_data_word(emu, destoffset); switch (emu->cur_rh) { case 3: /* call far ptr ... */ destval2 = fetch_data_word(emu, destoffset + 2); push_word(emu, emu->x86.R_CS); emu->x86.R_CS = destval2; push_word(emu, emu->x86.R_IP); emu->x86.R_IP = destval; break; case 5: /* jmp far ptr ... */ destval2 = fetch_data_word(emu, destoffset + 2); emu->x86.R_IP = destval; emu->x86.R_CS = destval2; break; } } else { destval = *decode_rl_word_register(emu); } switch (emu->cur_rh) { case 2: /* call word ptr */ push_word(emu, emu->x86.R_IP); emu->x86.R_IP = destval; break; case 4: /* jmp */ emu->x86.R_IP = destval; break; } } /* * * Single byte operation code table: */ static void x86emu_exec_one_byte(struct x86emu * emu) { uint8_t op1; op1 = fetch_byte_imm(emu); switch (op1) { case 0x00: common_binop_byte_rm_r(emu, add_byte); break; case 0x01: common_binop_word_long_rm_r(emu, add_word, add_long); break; case 0x02: common_binop_byte_r_rm(emu, add_byte); break; case 0x03: common_binop_word_long_r_rm(emu, add_word, add_long); break; case 0x04: common_binop_byte_imm(emu, add_byte); break; case 0x05: common_binop_word_long_imm(emu, add_word, add_long); break; case 0x06: push_word(emu, emu->x86.R_ES); break; case 0x07: emu->x86.R_ES = pop_word(emu); break; case 0x08: common_binop_byte_rm_r(emu, or_byte); break; case 0x09: common_binop_word_long_rm_r(emu, or_word, or_long); break; case 0x0a: common_binop_byte_r_rm(emu, or_byte); break; case 0x0b: common_binop_word_long_r_rm(emu, or_word, or_long); break; case 0x0c: common_binop_byte_imm(emu, or_byte); break; case 0x0d: common_binop_word_long_imm(emu, or_word, or_long); break; case 0x0e: push_word(emu, emu->x86.R_CS); break; case 0x0f: x86emu_exec_two_byte(emu); break; case 0x10: common_binop_byte_rm_r(emu, adc_byte); break; case 0x11: common_binop_word_long_rm_r(emu, adc_word, adc_long); break; case 0x12: common_binop_byte_r_rm(emu, adc_byte); break; case 0x13: common_binop_word_long_r_rm(emu, adc_word, adc_long); break; case 0x14: common_binop_byte_imm(emu, adc_byte); break; case 0x15: common_binop_word_long_imm(emu, adc_word, adc_long); break; case 0x16: push_word(emu, emu->x86.R_SS); break; case 0x17: emu->x86.R_SS = pop_word(emu); break; case 0x18: common_binop_byte_rm_r(emu, sbb_byte); break; case 0x19: common_binop_word_long_rm_r(emu, sbb_word, sbb_long); break; case 0x1a: common_binop_byte_r_rm(emu, sbb_byte); break; case 0x1b: common_binop_word_long_r_rm(emu, sbb_word, sbb_long); break; case 0x1c: common_binop_byte_imm(emu, sbb_byte); break; case 0x1d: common_binop_word_long_imm(emu, sbb_word, sbb_long); break; case 0x1e: push_word(emu, emu->x86.R_DS); break; case 0x1f: emu->x86.R_DS = pop_word(emu); break; case 0x20: common_binop_byte_rm_r(emu, and_byte); break; case 0x21: common_binop_word_long_rm_r(emu, and_word, and_long); break; case 0x22: common_binop_byte_r_rm(emu, and_byte); break; case 0x23: common_binop_word_long_r_rm(emu, and_word, and_long); break; case 0x24: common_binop_byte_imm(emu, and_byte); break; case 0x25: common_binop_word_long_imm(emu, and_word, and_long); break; case 0x26: emu->x86.mode |= SYSMODE_SEGOVR_ES; break; case 0x27: emu->x86.R_AL = daa_byte(emu, emu->x86.R_AL); break; case 0x28: common_binop_byte_rm_r(emu, sub_byte); break; case 0x29: common_binop_word_long_rm_r(emu, sub_word, sub_long); break; case 0x2a: common_binop_byte_r_rm(emu, sub_byte); break; case 0x2b: common_binop_word_long_r_rm(emu, sub_word, sub_long); break; case 0x2c: common_binop_byte_imm(emu, sub_byte); break; case 0x2d: common_binop_word_long_imm(emu, sub_word, sub_long); break; case 0x2e: emu->x86.mode |= SYSMODE_SEGOVR_CS; break; case 0x2f: emu->x86.R_AL = das_byte(emu, emu->x86.R_AL); break; case 0x30: common_binop_byte_rm_r(emu, xor_byte); break; case 0x31: common_binop_word_long_rm_r(emu, xor_word, xor_long); break; case 0x32: common_binop_byte_r_rm(emu, xor_byte); break; case 0x33: common_binop_word_long_r_rm(emu, xor_word, xor_long); break; case 0x34: common_binop_byte_imm(emu, xor_byte); break; case 0x35: common_binop_word_long_imm(emu, xor_word, xor_long); break; case 0x36: emu->x86.mode |= SYSMODE_SEGOVR_SS; break; case 0x37: emu->x86.R_AX = aaa_word(emu, emu->x86.R_AX); break; case 0x38: common_binop_ns_byte_rm_r(emu, cmp_byte_no_return); break; case 0x39: common_binop_ns_word_long_rm_r(emu, cmp_word_no_return, cmp_long_no_return); break; case 0x3a: x86emuOp_cmp_byte_R_RM(emu); break; case 0x3b: x86emuOp_cmp_word_R_RM(emu); break; case 0x3c: x86emuOp_cmp_byte_AL_IMM(emu); break; case 0x3d: x86emuOp_cmp_word_AX_IMM(emu); break; case 0x3e: emu->x86.mode |= SYSMODE_SEGOVR_DS; break; case 0x3f: emu->x86.R_AX = aas_word(emu, emu->x86.R_AX); break; case 0x40: common_inc_word_long(emu, &emu->x86.register_a); break; case 0x41: common_inc_word_long(emu, &emu->x86.register_c); break; case 0x42: common_inc_word_long(emu, &emu->x86.register_d); break; case 0x43: common_inc_word_long(emu, &emu->x86.register_b); break; case 0x44: common_inc_word_long(emu, &emu->x86.register_sp); break; case 0x45: common_inc_word_long(emu, &emu->x86.register_bp); break; case 0x46: common_inc_word_long(emu, &emu->x86.register_si); break; case 0x47: common_inc_word_long(emu, &emu->x86.register_di); break; case 0x48: common_dec_word_long(emu, &emu->x86.register_a); break; case 0x49: common_dec_word_long(emu, &emu->x86.register_c); break; case 0x4a: common_dec_word_long(emu, &emu->x86.register_d); break; case 0x4b: common_dec_word_long(emu, &emu->x86.register_b); break; case 0x4c: common_dec_word_long(emu, &emu->x86.register_sp); break; case 0x4d: common_dec_word_long(emu, &emu->x86.register_bp); break; case 0x4e: common_dec_word_long(emu, &emu->x86.register_si); break; case 0x4f: common_dec_word_long(emu, &emu->x86.register_di); break; case 0x50: common_push_word_long(emu, &emu->x86.register_a); break; case 0x51: common_push_word_long(emu, &emu->x86.register_c); break; case 0x52: common_push_word_long(emu, &emu->x86.register_d); break; case 0x53: common_push_word_long(emu, &emu->x86.register_b); break; case 0x54: common_push_word_long(emu, &emu->x86.register_sp); break; case 0x55: common_push_word_long(emu, &emu->x86.register_bp); break; case 0x56: common_push_word_long(emu, &emu->x86.register_si); break; case 0x57: common_push_word_long(emu, &emu->x86.register_di); break; case 0x58: common_pop_word_long(emu, &emu->x86.register_a); break; case 0x59: common_pop_word_long(emu, &emu->x86.register_c); break; case 0x5a: common_pop_word_long(emu, &emu->x86.register_d); break; case 0x5b: common_pop_word_long(emu, &emu->x86.register_b); break; case 0x5c: common_pop_word_long(emu, &emu->x86.register_sp); break; case 0x5d: common_pop_word_long(emu, &emu->x86.register_bp); break; case 0x5e: common_pop_word_long(emu, &emu->x86.register_si); break; case 0x5f: common_pop_word_long(emu, &emu->x86.register_di); break; case 0x60: x86emuOp_push_all(emu); break; case 0x61: x86emuOp_pop_all(emu); break; /* 0x62 bound */ /* 0x63 arpl */ case 0x64: emu->x86.mode |= SYSMODE_SEGOVR_FS; break; case 0x65: emu->x86.mode |= SYSMODE_SEGOVR_GS; break; case 0x66: emu->x86.mode |= SYSMODE_PREFIX_DATA; break; case 0x67: emu->x86.mode |= SYSMODE_PREFIX_ADDR; break; case 0x68: x86emuOp_push_word_IMM(emu); break; case 0x69: common_imul_imm(emu, 0); break; case 0x6a: x86emuOp_push_byte_IMM(emu); break; case 0x6b: common_imul_imm(emu, 1); break; case 0x6c: ins(emu, 1); break; case 0x6d: x86emuOp_ins_word(emu); break; case 0x6e: outs(emu, 1); break; case 0x6f: x86emuOp_outs_word(emu); break; case 0x70: common_jmp_near(emu, ACCESS_FLAG(F_OF)); break; case 0x71: common_jmp_near(emu, !ACCESS_FLAG(F_OF)); break; case 0x72: common_jmp_near(emu, ACCESS_FLAG(F_CF)); break; case 0x73: common_jmp_near(emu, !ACCESS_FLAG(F_CF)); break; case 0x74: common_jmp_near(emu, ACCESS_FLAG(F_ZF)); break; case 0x75: common_jmp_near(emu, !ACCESS_FLAG(F_ZF)); break; case 0x76: common_jmp_near(emu, ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF)); break; case 0x77: common_jmp_near(emu, !ACCESS_FLAG(F_CF) && !ACCESS_FLAG(F_ZF)); break; case 0x78: common_jmp_near(emu, ACCESS_FLAG(F_SF)); break; case 0x79: common_jmp_near(emu, !ACCESS_FLAG(F_SF)); break; case 0x7a: common_jmp_near(emu, ACCESS_FLAG(F_PF)); break; case 0x7b: common_jmp_near(emu, !ACCESS_FLAG(F_PF)); break; case 0x7c: x86emuOp_jump_near_L(emu); break; case 0x7d: x86emuOp_jump_near_NL(emu); break; case 0x7e: x86emuOp_jump_near_LE(emu); break; case 0x7f: x86emuOp_jump_near_NLE(emu); break; case 0x80: x86emuOp_opc80_byte_RM_IMM(emu); break; case 0x81: x86emuOp_opc81_word_RM_IMM(emu); break; case 0x82: x86emuOp_opc82_byte_RM_IMM(emu); break; case 0x83: x86emuOp_opc83_word_RM_IMM(emu); break; case 0x84: common_binop_ns_byte_rm_r(emu, test_byte); break; case 0x85: common_binop_ns_word_long_rm_r(emu, test_word, test_long); break; case 0x86: x86emuOp_xchg_byte_RM_R(emu); break; case 0x87: x86emuOp_xchg_word_RM_R(emu); break; case 0x88: x86emuOp_mov_byte_RM_R(emu); break; case 0x89: x86emuOp_mov_word_RM_R(emu); break; case 0x8a: x86emuOp_mov_byte_R_RM(emu); break; case 0x8b: x86emuOp_mov_word_R_RM(emu); break; case 0x8c: x86emuOp_mov_word_RM_SR(emu); break; case 0x8d: x86emuOp_lea_word_R_M(emu); break; case 0x8e: x86emuOp_mov_word_SR_RM(emu); break; case 0x8f: x86emuOp_pop_RM(emu); break; case 0x90: /* nop */ break; case 0x91: x86emuOp_xchg_word_AX_CX(emu); break; case 0x92: x86emuOp_xchg_word_AX_DX(emu); break; case 0x93: x86emuOp_xchg_word_AX_BX(emu); break; case 0x94: x86emuOp_xchg_word_AX_SP(emu); break; case 0x95: x86emuOp_xchg_word_AX_BP(emu); break; case 0x96: x86emuOp_xchg_word_AX_SI(emu); break; case 0x97: x86emuOp_xchg_word_AX_DI(emu); break; case 0x98: x86emuOp_cbw(emu); break; case 0x99: x86emuOp_cwd(emu); break; case 0x9a: x86emuOp_call_far_IMM(emu); break; case 0x9b: /* wait */ break; case 0x9c: x86emuOp_pushf_word(emu); break; case 0x9d: x86emuOp_popf_word(emu); break; case 0x9e: x86emuOp_sahf(emu); break; case 0x9f: x86emuOp_lahf(emu); break; case 0xa0: x86emuOp_mov_AL_M_IMM(emu); break; case 0xa1: x86emuOp_mov_AX_M_IMM(emu); break; case 0xa2: x86emuOp_mov_M_AL_IMM(emu); break; case 0xa3: x86emuOp_mov_M_AX_IMM(emu); break; case 0xa4: x86emuOp_movs_byte(emu); break; case 0xa5: x86emuOp_movs_word(emu); break; case 0xa6: x86emuOp_cmps_byte(emu); break; case 0xa7: x86emuOp_cmps_word(emu); break; case 0xa8: test_byte(emu, emu->x86.R_AL, fetch_byte_imm(emu)); break; case 0xa9: x86emuOp_test_AX_IMM(emu); break; case 0xaa: x86emuOp_stos_byte(emu); break; case 0xab: x86emuOp_stos_word(emu); break; case 0xac: x86emuOp_lods_byte(emu); break; case 0xad: x86emuOp_lods_word(emu); break; case 0xae: x86emuOp_scas_byte(emu); break; case 0xaf: x86emuOp_scas_word(emu); break; case 0xb0: emu->x86.R_AL = fetch_byte_imm(emu); break; case 0xb1: emu->x86.R_CL = fetch_byte_imm(emu); break; case 0xb2: emu->x86.R_DL = fetch_byte_imm(emu); break; case 0xb3: emu->x86.R_BL = fetch_byte_imm(emu); break; case 0xb4: emu->x86.R_AH = fetch_byte_imm(emu); break; case 0xb5: emu->x86.R_CH = fetch_byte_imm(emu); break; case 0xb6: emu->x86.R_DH = fetch_byte_imm(emu); break; case 0xb7: emu->x86.R_BH = fetch_byte_imm(emu); break; case 0xb8: x86emuOp_mov_word_AX_IMM(emu); break; case 0xb9: x86emuOp_mov_word_CX_IMM(emu); break; case 0xba: x86emuOp_mov_word_DX_IMM(emu); break; case 0xbb: x86emuOp_mov_word_BX_IMM(emu); break; case 0xbc: x86emuOp_mov_word_SP_IMM(emu); break; case 0xbd: x86emuOp_mov_word_BP_IMM(emu); break; case 0xbe: x86emuOp_mov_word_SI_IMM(emu); break; case 0xbf: x86emuOp_mov_word_DI_IMM(emu); break; case 0xc0: x86emuOp_opcC0_byte_RM_MEM(emu); break; case 0xc1: x86emuOp_opcC1_word_RM_MEM(emu); break; case 0xc2: x86emuOp_ret_near_IMM(emu); break; case 0xc3: emu->x86.R_IP = pop_word(emu); break; case 0xc4: common_load_far_pointer(emu, &emu->x86.R_ES); break; case 0xc5: common_load_far_pointer(emu, &emu->x86.R_DS); break; case 0xc6: x86emuOp_mov_byte_RM_IMM(emu); break; case 0xc7: x86emuOp_mov_word_RM_IMM(emu); break; case 0xc8: x86emuOp_enter(emu); break; case 0xc9: x86emuOp_leave(emu); break; case 0xca: x86emuOp_ret_far_IMM(emu); break; case 0xcb: x86emuOp_ret_far(emu); break; case 0xcc: x86emuOp_int3(emu); break; case 0xcd: x86emuOp_int_IMM(emu); break; case 0xce: x86emuOp_into(emu); break; case 0xcf: x86emuOp_iret(emu); break; case 0xd0: x86emuOp_opcD0_byte_RM_1(emu); break; case 0xd1: x86emuOp_opcD1_word_RM_1(emu); break; case 0xd2: x86emuOp_opcD2_byte_RM_CL(emu); break; case 0xd3: x86emuOp_opcD3_word_RM_CL(emu); break; case 0xd4: x86emuOp_aam(emu); break; case 0xd5: x86emuOp_aad(emu); break; /* 0xd6 Undocumented SETALC instruction */ case 0xd7: x86emuOp_xlat(emu); break; case 0xd8: x86emuOp_esc_coprocess_d8(emu); break; case 0xd9: x86emuOp_esc_coprocess_d9(emu); break; case 0xda: x86emuOp_esc_coprocess_da(emu); break; case 0xdb: x86emuOp_esc_coprocess_db(emu); break; case 0xdc: x86emuOp_esc_coprocess_dc(emu); break; case 0xdd: x86emuOp_esc_coprocess_dd(emu); break; case 0xde: x86emuOp_esc_coprocess_de(emu); break; case 0xdf: x86emuOp_esc_coprocess_df(emu); break; case 0xe0: x86emuOp_loopne(emu); break; case 0xe1: x86emuOp_loope(emu); break; case 0xe2: x86emuOp_loop(emu); break; case 0xe3: x86emuOp_jcxz(emu); break; case 0xe4: x86emuOp_in_byte_AL_IMM(emu); break; case 0xe5: x86emuOp_in_word_AX_IMM(emu); break; case 0xe6: x86emuOp_out_byte_IMM_AL(emu); break; case 0xe7: x86emuOp_out_word_IMM_AX(emu); break; case 0xe8: x86emuOp_call_near_IMM(emu); break; case 0xe9: x86emuOp_jump_near_IMM(emu); break; case 0xea: x86emuOp_jump_far_IMM(emu); break; case 0xeb: x86emuOp_jump_byte_IMM(emu); break; case 0xec: x86emuOp_in_byte_AL_DX(emu); break; case 0xed: x86emuOp_in_word_AX_DX(emu); break; case 0xee: x86emuOp_out_byte_DX_AL(emu); break; case 0xef: x86emuOp_out_word_DX_AX(emu); break; case 0xf0: x86emuOp_lock(emu); break; case 0xf2: emu->x86.mode |= SYSMODE_PREFIX_REPNE; break; case 0xf3: emu->x86.mode |= SYSMODE_PREFIX_REPE; break; case 0xf4: x86emu_halt_sys(emu); break; case 0xf5: x86emuOp_cmc(emu); break; case 0xf6: x86emuOp_opcF6_byte_RM(emu); break; case 0xf7: x86emuOp_opcF7_word_RM(emu); break; case 0xf8: CLEAR_FLAG(F_CF); break; case 0xf9: SET_FLAG(F_CF); break; case 0xfa: CLEAR_FLAG(F_IF); break; case 0xfb: SET_FLAG(F_IF); break; case 0xfc: CLEAR_FLAG(F_DF); break; case 0xfd: SET_FLAG(F_DF); break; case 0xfe: x86emuOp_opcFE_byte_RM(emu); break; case 0xff: x86emuOp_opcFF_word_RM(emu); break; default: x86emu_halt_sys(emu); break; } if (op1 != 0x26 && op1 != 0x2e && op1 != 0x36 && op1 != 0x3e && (op1 | 3) != 0x67) emu->x86.mode &= ~SYSMODE_CLRMASK; } static void common_jmp_long(struct x86emu *emu, int cond) { int16_t target; target = (int16_t) fetch_word_imm(emu); target += (int16_t) emu->x86.R_IP; if (cond) emu->x86.R_IP = (uint16_t) target; } static void common_set_byte(struct x86emu *emu, int cond) { uint32_t destoffset; uint8_t *destreg, destval; fetch_decode_modrm(emu); destval = cond ? 0x01 : 0x00; if (emu->cur_mod != 3) { destoffset = decode_rl_address(emu); store_data_byte(emu, destoffset, destval); } else { destreg = decode_rl_byte_register(emu); *destreg = destval; } } static void common_bitstring32(struct x86emu *emu, int op) { int bit; uint32_t srcval, *shiftreg, mask; fetch_decode_modrm(emu); shiftreg = decode_rh_long_register(emu); srcval = decode_and_fetch_long_disp(emu, (int16_t) *shiftreg >> 5); bit = *shiftreg & 0x1F; mask = 0x1 << bit; CONDITIONAL_SET_FLAG(srcval & mask, F_CF); switch (op) { case 0: break; case 1: write_back_long(emu, srcval | mask); break; case 2: write_back_long(emu, srcval & ~mask); break; case 3: write_back_long(emu, srcval ^ mask); break; } } static void common_bitstring16(struct x86emu *emu, int op) { int bit; uint16_t srcval, *shiftreg, mask; fetch_decode_modrm(emu); shiftreg = decode_rh_word_register(emu); srcval = decode_and_fetch_word_disp(emu, (int16_t) *shiftreg >> 4); bit = *shiftreg & 0xF; mask = 0x1 << bit; CONDITIONAL_SET_FLAG(srcval & mask, F_CF); switch (op) { case 0: break; case 1: write_back_word(emu, srcval | mask); break; case 2: write_back_word(emu, srcval & ~mask); break; case 3: write_back_word(emu, srcval ^ mask); break; } } static void common_bitstring(struct x86emu *emu, int op) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_bitstring32(emu, op); else common_bitstring16(emu, op); } static void common_bitsearch32(struct x86emu *emu, int diff) { uint32_t srcval, *dstreg; fetch_decode_modrm(emu); dstreg = decode_rh_long_register(emu); srcval = decode_and_fetch_long(emu); CONDITIONAL_SET_FLAG(srcval == 0, F_ZF); for (*dstreg = 0; *dstreg < 32; *dstreg += diff) { if ((srcval >> *dstreg) & 1) break; } } static void common_bitsearch16(struct x86emu *emu, int diff) { uint16_t srcval, *dstreg; fetch_decode_modrm(emu); dstreg = decode_rh_word_register(emu); srcval = decode_and_fetch_word(emu); CONDITIONAL_SET_FLAG(srcval == 0, F_ZF); for (*dstreg = 0; *dstreg < 16; *dstreg += diff) { if ((srcval >> *dstreg) & 1) break; } } static void common_bitsearch(struct x86emu *emu, int diff) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_bitsearch32(emu, diff); else common_bitsearch16(emu, diff); } static void common_shift32(struct x86emu *emu, int shift_left, int use_cl) { uint8_t shift; uint32_t destval, *shiftreg; fetch_decode_modrm(emu); shiftreg = decode_rh_long_register(emu); if (use_cl) { destval = decode_and_fetch_long(emu); shift = emu->x86.R_CL; } else { destval = decode_and_fetch_long_imm8(emu, &shift); } if (shift_left) destval = shld_long(emu, destval, *shiftreg, shift); else destval = shrd_long(emu, destval, *shiftreg, shift); write_back_long(emu, destval); } static void common_shift16(struct x86emu *emu, int shift_left, int use_cl) { uint8_t shift; uint16_t destval, *shiftreg; fetch_decode_modrm(emu); shiftreg = decode_rh_word_register(emu); if (use_cl) { destval = decode_and_fetch_word(emu); shift = emu->x86.R_CL; } else { destval = decode_and_fetch_word_imm8(emu, &shift); } if (shift_left) destval = shld_word(emu, destval, *shiftreg, shift); else destval = shrd_word(emu, destval, *shiftreg, shift); write_back_word(emu, destval); } static void common_shift(struct x86emu *emu, int shift_left, int use_cl) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) common_shift32(emu, shift_left, use_cl); else common_shift16(emu, shift_left, use_cl); } /* * Implementation */ #define xorl(a,b) ((a) && !(b)) || (!(a) && (b)) /* * REMARKS: * Handles opcode 0x0f,0x31 */ static void x86emuOp2_rdtsc(struct x86emu *emu) { emu->x86.R_EAX = emu->cur_cycles & 0xffffffff; emu->x86.R_EDX = emu->cur_cycles >> 32; } /* * REMARKS: * Handles opcode 0x0f,0xa0 */ static void x86emuOp2_push_FS(struct x86emu *emu) { push_word(emu, emu->x86.R_FS); } /* * REMARKS: * Handles opcode 0x0f,0xa1 */ static void x86emuOp2_pop_FS(struct x86emu *emu) { emu->x86.R_FS = pop_word(emu); } /* * REMARKS: * Handles opcode 0x0f,0xa1 */ #if defined(__i386__) || defined(__amd64__) static void hw_cpuid(uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d) { __asm__ volatile("cpuid" : "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d) : "a" (*a), "c" (*c) : "cc"); } #endif static void x86emuOp2_cpuid(struct x86emu *emu) { #if defined(__i386__) || defined(__amd64__) hw_cpuid(&emu->x86.R_EAX, &emu->x86.R_EBX, &emu->x86.R_ECX, &emu->x86.R_EDX); #endif switch (emu->x86.R_EAX) { case 0: emu->x86.R_EAX = 1; #if !defined(__i386__) && !defined(__amd64__) /* "GenuineIntel" */ emu->x86.R_EBX = 0x756e6547; emu->x86.R_EDX = 0x49656e69; emu->x86.R_ECX = 0x6c65746e; #endif break; case 1: #if !defined(__i386__) && !defined(__amd64__) emu->x86.R_EAX = 0x00000480; emu->x86.R_EBX = emu->x86.R_ECX = 0; emu->x86.R_EDX = 0x00000002; #else emu->x86.R_EDX &= 0x00000012; #endif break; default: emu->x86.R_EAX = emu->x86.R_EBX = emu->x86.R_ECX = emu->x86.R_EDX = 0; break; } } /* * REMARKS: * Handles opcode 0x0f,0xa3 */ static void x86emuOp2_bt_R(struct x86emu *emu) { common_bitstring(emu, 0); } /* * REMARKS: * Handles opcode 0x0f,0xa4 */ static void x86emuOp2_shld_IMM(struct x86emu *emu) { common_shift(emu, 1, 0); } /* * REMARKS: * Handles opcode 0x0f,0xa5 */ static void x86emuOp2_shld_CL(struct x86emu *emu) { common_shift(emu, 1, 1); } /* * REMARKS: * Handles opcode 0x0f,0xa8 */ static void x86emuOp2_push_GS(struct x86emu *emu) { push_word(emu, emu->x86.R_GS); } /* * REMARKS: * Handles opcode 0x0f,0xa9 */ static void x86emuOp2_pop_GS(struct x86emu *emu) { emu->x86.R_GS = pop_word(emu); } /* * REMARKS: * Handles opcode 0x0f,0xab */ static void x86emuOp2_bts_R(struct x86emu *emu) { common_bitstring(emu, 1); } /* * REMARKS: * Handles opcode 0x0f,0xac */ static void x86emuOp2_shrd_IMM(struct x86emu *emu) { common_shift(emu, 0, 0); } /* * REMARKS: * Handles opcode 0x0f,0xad */ static void x86emuOp2_shrd_CL(struct x86emu *emu) { common_shift(emu, 0, 1); } /* * REMARKS: * Handles opcode 0x0f,0xaf */ static void x86emuOp2_32_imul_R_RM(struct x86emu *emu) { uint32_t *destreg, srcval; uint64_t res; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); srcval = decode_and_fetch_long(emu); res = (int32_t) *destreg * (int32_t)srcval; if (res > 0xffffffff) { SET_FLAG(F_CF); SET_FLAG(F_OF); } else { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } *destreg = (uint32_t) res; } static void x86emuOp2_16_imul_R_RM(struct x86emu *emu) { uint16_t *destreg, srcval; uint32_t res; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); srcval = decode_and_fetch_word(emu); res = (int16_t) * destreg * (int16_t)srcval; if (res > 0xFFFF) { SET_FLAG(F_CF); SET_FLAG(F_OF); } else { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } *destreg = (uint16_t) res; } static void x86emuOp2_imul_R_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp2_32_imul_R_RM(emu); else x86emuOp2_16_imul_R_RM(emu); } /* * REMARKS: * Handles opcode 0x0f,0xb2 */ static void x86emuOp2_lss_R_IMM(struct x86emu *emu) { common_load_far_pointer(emu, &emu->x86.R_SS); } /* * REMARKS: * Handles opcode 0x0f,0xb3 */ static void x86emuOp2_btr_R(struct x86emu *emu) { common_bitstring(emu, 2); } /* * REMARKS: * Handles opcode 0x0f,0xb4 */ static void x86emuOp2_lfs_R_IMM(struct x86emu *emu) { common_load_far_pointer(emu, &emu->x86.R_FS); } /* * REMARKS: * Handles opcode 0x0f,0xb5 */ static void x86emuOp2_lgs_R_IMM(struct x86emu *emu) { common_load_far_pointer(emu, &emu->x86.R_GS); } /* * REMARKS: * Handles opcode 0x0f,0xb6 */ static void x86emuOp2_32_movzx_byte_R_RM(struct x86emu *emu) { uint32_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); *destreg = decode_and_fetch_byte(emu); } static void x86emuOp2_16_movzx_byte_R_RM(struct x86emu *emu) { uint16_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); *destreg = decode_and_fetch_byte(emu); } static void x86emuOp2_movzx_byte_R_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp2_32_movzx_byte_R_RM(emu); else x86emuOp2_16_movzx_byte_R_RM(emu); } /* * REMARKS: * Handles opcode 0x0f,0xb7 */ static void x86emuOp2_movzx_word_R_RM(struct x86emu *emu) { uint32_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); *destreg = decode_and_fetch_word(emu); } /* * REMARKS: * Handles opcode 0x0f,0xba */ static void x86emuOp2_32_btX_I(struct x86emu *emu) { int bit; uint32_t srcval, mask; uint8_t shift; fetch_decode_modrm(emu); if (emu->cur_rh < 4) x86emu_halt_sys(emu); srcval = decode_and_fetch_long_imm8(emu, &shift); bit = shift & 0x1F; mask = (0x1 << bit); switch (emu->cur_rh) { case 5: write_back_long(emu, srcval | mask); break; case 6: write_back_long(emu, srcval & ~mask); break; case 7: write_back_long(emu, srcval ^ mask); break; } CONDITIONAL_SET_FLAG(srcval & mask, F_CF); } static void x86emuOp2_16_btX_I(struct x86emu *emu) { int bit; uint16_t srcval, mask; uint8_t shift; fetch_decode_modrm(emu); if (emu->cur_rh < 4) x86emu_halt_sys(emu); srcval = decode_and_fetch_word_imm8(emu, &shift); bit = shift & 0xF; mask = (0x1 << bit); switch (emu->cur_rh) { case 5: write_back_word(emu, srcval | mask); break; case 6: write_back_word(emu, srcval & ~mask); break; case 7: write_back_word(emu, srcval ^ mask); break; } CONDITIONAL_SET_FLAG(srcval & mask, F_CF); } static void x86emuOp2_btX_I(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp2_32_btX_I(emu); else x86emuOp2_16_btX_I(emu); } /* * REMARKS: * Handles opcode 0x0f,0xbb */ static void x86emuOp2_btc_R(struct x86emu *emu) { common_bitstring(emu, 3); } /* * REMARKS: * Handles opcode 0x0f,0xbc */ static void x86emuOp2_bsf(struct x86emu *emu) { common_bitsearch(emu, +1); } /* * REMARKS: * Handles opcode 0x0f,0xbd */ static void x86emuOp2_bsr(struct x86emu *emu) { common_bitsearch(emu, -1); } /* * REMARKS: * Handles opcode 0x0f,0xbe */ static void x86emuOp2_32_movsx_byte_R_RM(struct x86emu *emu) { uint32_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); *destreg = (int32_t)(int8_t)decode_and_fetch_byte(emu); } static void x86emuOp2_16_movsx_byte_R_RM(struct x86emu *emu) { uint16_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_word_register(emu); *destreg = (int16_t)(int8_t)decode_and_fetch_byte(emu); } static void x86emuOp2_movsx_byte_R_RM(struct x86emu *emu) { if (emu->x86.mode & SYSMODE_PREFIX_DATA) x86emuOp2_32_movsx_byte_R_RM(emu); else x86emuOp2_16_movsx_byte_R_RM(emu); } /* * REMARKS: * Handles opcode 0x0f,0xbf */ static void x86emuOp2_movsx_word_R_RM(struct x86emu *emu) { uint32_t *destreg; fetch_decode_modrm(emu); destreg = decode_rh_long_register(emu); *destreg = (int32_t)(int16_t)decode_and_fetch_word(emu); } static void x86emu_exec_two_byte(struct x86emu * emu) { uint8_t op2; op2 = fetch_byte_imm(emu); switch (op2) { /* 0x00 Group F (ring 0 PM) */ /* 0x01 Group G (ring 0 PM) */ /* 0x02 lar (ring 0 PM) */ /* 0x03 lsl (ring 0 PM) */ /* 0x05 loadall (undocumented) */ /* 0x06 clts (ring 0 PM) */ /* 0x07 loadall (undocumented) */ /* 0x08 invd (ring 0 PM) */ /* 0x09 wbinvd (ring 0 PM) */ /* 0x20 mov reg32(op2); break;creg (ring 0 PM) */ /* 0x21 mov reg32(op2); break;dreg (ring 0 PM) */ /* 0x22 mov creg(op2); break;reg32 (ring 0 PM) */ /* 0x23 mov dreg(op2); break;reg32 (ring 0 PM) */ /* 0x24 mov reg32(op2); break;treg (ring 0 PM) */ /* 0x26 mov treg(op2); break;reg32 (ring 0 PM) */ case 0x31: x86emuOp2_rdtsc(emu); break; case 0x80: common_jmp_long(emu, ACCESS_FLAG(F_OF)); break; case 0x81: common_jmp_long(emu, !ACCESS_FLAG(F_OF)); break; case 0x82: common_jmp_long(emu, ACCESS_FLAG(F_CF)); break; case 0x83: common_jmp_long(emu, !ACCESS_FLAG(F_CF)); break; case 0x84: common_jmp_long(emu, ACCESS_FLAG(F_ZF)); break; case 0x85: common_jmp_long(emu, !ACCESS_FLAG(F_ZF)); break; case 0x86: common_jmp_long(emu, ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF)); break; case 0x87: common_jmp_long(emu, !(ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF))); break; case 0x88: common_jmp_long(emu, ACCESS_FLAG(F_SF)); break; case 0x89: common_jmp_long(emu, !ACCESS_FLAG(F_SF)); break; case 0x8a: common_jmp_long(emu, ACCESS_FLAG(F_PF)); break; case 0x8b: common_jmp_long(emu, !ACCESS_FLAG(F_PF)); break; case 0x8c: common_jmp_long(emu, xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF))); break; case 0x8d: common_jmp_long(emu, !(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)))); break; case 0x8e: common_jmp_long(emu, (xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) || ACCESS_FLAG(F_ZF))); break; case 0x8f: common_jmp_long(emu, !(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) || ACCESS_FLAG(F_ZF))); break; case 0x90: common_set_byte(emu, ACCESS_FLAG(F_OF)); break; case 0x91: common_set_byte(emu, !ACCESS_FLAG(F_OF)); break; case 0x92: common_set_byte(emu, ACCESS_FLAG(F_CF)); break; case 0x93: common_set_byte(emu, !ACCESS_FLAG(F_CF)); break; case 0x94: common_set_byte(emu, ACCESS_FLAG(F_ZF)); break; case 0x95: common_set_byte(emu, !ACCESS_FLAG(F_ZF)); break; case 0x96: common_set_byte(emu, ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF)); break; case 0x97: common_set_byte(emu, !(ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF))); break; case 0x98: common_set_byte(emu, ACCESS_FLAG(F_SF)); break; case 0x99: common_set_byte(emu, !ACCESS_FLAG(F_SF)); break; case 0x9a: common_set_byte(emu, ACCESS_FLAG(F_PF)); break; case 0x9b: common_set_byte(emu, !ACCESS_FLAG(F_PF)); break; case 0x9c: common_set_byte(emu, xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF))); break; case 0x9d: common_set_byte(emu, xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF))); break; case 0x9e: common_set_byte(emu, (xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) || ACCESS_FLAG(F_ZF))); break; case 0x9f: common_set_byte(emu, !(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) || ACCESS_FLAG(F_ZF))); break; case 0xa0: x86emuOp2_push_FS(emu); break; case 0xa1: x86emuOp2_pop_FS(emu); break; case 0xa2: x86emuOp2_cpuid(emu); break; case 0xa3: x86emuOp2_bt_R(emu); break; case 0xa4: x86emuOp2_shld_IMM(emu); break; case 0xa5: x86emuOp2_shld_CL(emu); break; case 0xa8: x86emuOp2_push_GS(emu); break; case 0xa9: x86emuOp2_pop_GS(emu); break; case 0xab: x86emuOp2_bts_R(emu); break; case 0xac: x86emuOp2_shrd_IMM(emu); break; case 0xad: x86emuOp2_shrd_CL(emu); break; case 0xaf: x86emuOp2_imul_R_RM(emu); break; /* 0xb0 TODO: cmpxchg */ /* 0xb1 TODO: cmpxchg */ case 0xb2: x86emuOp2_lss_R_IMM(emu); break; case 0xb3: x86emuOp2_btr_R(emu); break; case 0xb4: x86emuOp2_lfs_R_IMM(emu); break; case 0xb5: x86emuOp2_lgs_R_IMM(emu); break; case 0xb6: x86emuOp2_movzx_byte_R_RM(emu); break; case 0xb7: x86emuOp2_movzx_word_R_RM(emu); break; case 0xba: x86emuOp2_btX_I(emu); break; case 0xbb: x86emuOp2_btc_R(emu); break; case 0xbc: x86emuOp2_bsf(emu); break; case 0xbd: x86emuOp2_bsr(emu); break; case 0xbe: x86emuOp2_movsx_byte_R_RM(emu); break; case 0xbf: x86emuOp2_movsx_word_R_RM(emu); break; /* 0xc0 TODO: xadd */ /* 0xc1 TODO: xadd */ /* 0xc8 TODO: bswap */ /* 0xc9 TODO: bswap */ /* 0xca TODO: bswap */ /* 0xcb TODO: bswap */ /* 0xcc TODO: bswap */ /* 0xcd TODO: bswap */ /* 0xce TODO: bswap */ /* 0xcf TODO: bswap */ default: x86emu_halt_sys(emu); break; } } /* * Carry Chain Calculation * * This represents a somewhat expensive calculation which is * apparently required to emulate the setting of the OF and AF flag. * The latter is not so important, but the former is. The overflow * flag is the XOR of the top two bits of the carry chain for an * addition (similar for subtraction). Since we do not want to * simulate the addition in a bitwise manner, we try to calculate the * carry chain given the two operands and the result. * * So, given the following table, which represents the addition of two * bits, we can derive a formula for the carry chain. * * a b cin r cout * 0 0 0 0 0 * 0 0 1 1 0 * 0 1 0 1 0 * 0 1 1 0 1 * 1 0 0 1 0 * 1 0 1 0 1 * 1 1 0 0 1 * 1 1 1 1 1 * * Construction of table for cout: * * ab * r \ 00 01 11 10 * |------------------ * 0 | 0 1 1 1 * 1 | 0 0 1 0 * * By inspection, one gets: cc = ab + r'(a + b) * * That represents alot of operations, but NO CHOICE.... * * Borrow Chain Calculation. * * The following table represents the subtraction of two bits, from * which we can derive a formula for the borrow chain. * * a b bin r bout * 0 0 0 0 0 * 0 0 1 1 1 * 0 1 0 1 1 * 0 1 1 0 1 * 1 0 0 1 0 * 1 0 1 0 0 * 1 1 0 0 0 * 1 1 1 1 1 * * Construction of table for cout: * * ab * r \ 00 01 11 10 * |------------------ * 0 | 0 1 0 0 * 1 | 1 1 1 0 * * By inspection, one gets: bc = a'b + r(a' + b) * */ /* * Global Variables */ static uint32_t x86emu_parity_tab[8] = { 0x96696996, 0x69969669, 0x69969669, 0x96696996, 0x69969669, 0x96696996, 0x96696996, 0x69969669, }; #define PARITY(x) (((x86emu_parity_tab[(x) / 32] >> ((x) % 32)) & 1) == 0) #define XOR2(x) (((x) ^ ((x)>>1)) & 0x1) /* * REMARKS: * Implements the AAA instruction and side effects. */ static uint16_t aaa_word(struct x86emu *emu, uint16_t d) { uint16_t res; if ((d & 0xf) > 0x9 || ACCESS_FLAG(F_AF)) { d += 0x6; d += 0x100; SET_FLAG(F_AF); SET_FLAG(F_CF); } else { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); } res = (uint16_t) (d & 0xFF0F); CLEAR_FLAG(F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return res; } /* * REMARKS: * Implements the AAA instruction and side effects. */ static uint16_t aas_word(struct x86emu *emu, uint16_t d) { uint16_t res; if ((d & 0xf) > 0x9 || ACCESS_FLAG(F_AF)) { d -= 0x6; d -= 0x100; SET_FLAG(F_AF); SET_FLAG(F_CF); } else { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); } res = (uint16_t) (d & 0xFF0F); CLEAR_FLAG(F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return res; } /* * REMARKS: * Implements the AAD instruction and side effects. */ static uint16_t aad_word(struct x86emu *emu, uint16_t d) { uint16_t l; uint8_t hb, lb; hb = (uint8_t) ((d >> 8) & 0xff); lb = (uint8_t) ((d & 0xff)); l = (uint16_t) ((lb + 10 * hb) & 0xFF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(l & 0x80, F_SF); CONDITIONAL_SET_FLAG(l == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(l & 0xff), F_PF); return l; } /* * REMARKS: * Implements the AAM instruction and side effects. */ static uint16_t aam_word(struct x86emu *emu, uint8_t d) { uint16_t h, l; h = (uint16_t) (d / 10); l = (uint16_t) (d % 10); l |= (uint16_t) (h << 8); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(l & 0x80, F_SF); CONDITIONAL_SET_FLAG(l == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(l & 0xff), F_PF); return l; } /* * REMARKS: * Implements the ADC instruction and side effects. */ static uint8_t adc_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res; /* all operands in native machine order */ uint32_t cc; if (ACCESS_FLAG(F_CF)) res = 1 + d + s; else res = d + s; CONDITIONAL_SET_FLAG(res & 0x100, F_CF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (s & d) | ((~res) & (s | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 6), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return (uint8_t) res; } /* * REMARKS: * Implements the ADC instruction and side effects. */ static uint16_t adc_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint32_t res; /* all operands in native machine order */ uint32_t cc; if (ACCESS_FLAG(F_CF)) res = 1 + d + s; else res = d + s; CONDITIONAL_SET_FLAG(res & 0x10000, F_CF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (s & d) | ((~res) & (s | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 14), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return (uint16_t) res; } /* * REMARKS: * Implements the ADC instruction and side effects. */ static uint32_t adc_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t lo; /* all operands in native machine order */ uint32_t hi; uint32_t res; uint32_t cc; if (ACCESS_FLAG(F_CF)) { lo = 1 + (d & 0xFFFF) + (s & 0xFFFF); res = 1 + d + s; } else { lo = (d & 0xFFFF) + (s & 0xFFFF); res = d + s; } hi = (lo >> 16) + (d >> 16) + (s >> 16); CONDITIONAL_SET_FLAG(hi & 0x10000, F_CF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (s & d) | ((~res) & (s | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 30), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the ADD instruction and side effects. */ static uint8_t add_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res; /* all operands in native machine order */ uint32_t cc; res = d + s; CONDITIONAL_SET_FLAG(res & 0x100, F_CF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (s & d) | ((~res) & (s | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 6), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return (uint8_t) res; } /* * REMARKS: * Implements the ADD instruction and side effects. */ static uint16_t add_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint32_t res; /* all operands in native machine order */ uint32_t cc; res = d + s; CONDITIONAL_SET_FLAG(res & 0x10000, F_CF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (s & d) | ((~res) & (s | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 14), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return (uint16_t) res; } /* * REMARKS: * Implements the ADD instruction and side effects. */ static uint32_t add_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t lo; /* all operands in native machine order */ uint32_t hi; uint32_t res; uint32_t cc; lo = (d & 0xFFFF) + (s & 0xFFFF); res = d + s; hi = (lo >> 16) + (d >> 16) + (s >> 16); CONDITIONAL_SET_FLAG(hi & 0x10000, F_CF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (s & d) | ((~res) & (s | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 30), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the AND instruction and side effects. */ static uint8_t and_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint8_t res; /* all operands in native machine order */ res = d & s; /* set the flags */ CLEAR_FLAG(F_OF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res), F_PF); return res; } /* * REMARKS: * Implements the AND instruction and side effects. */ static uint16_t and_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint16_t res; /* all operands in native machine order */ res = d & s; /* set the flags */ CLEAR_FLAG(F_OF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return res; } /* * REMARKS: * Implements the AND instruction and side effects. */ static uint32_t and_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ res = d & s; /* set the flags */ CLEAR_FLAG(F_OF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return res; } /* * REMARKS: * Implements the CMP instruction and side effects. */ static uint8_t cmp_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - s; CLEAR_FLAG(F_CF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x80, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return d; } static void cmp_byte_no_return(struct x86emu *emu, uint8_t d, uint8_t s) { cmp_byte(emu, d, s); } /* * REMARKS: * Implements the CMP instruction and side effects. */ static uint16_t cmp_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - s; CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x8000, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return d; } static void cmp_word_no_return(struct x86emu *emu, uint16_t d, uint16_t s) { cmp_word(emu, d, s); } /* * REMARKS: * Implements the CMP instruction and side effects. */ static uint32_t cmp_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - s; CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x80000000, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return d; } static void cmp_long_no_return(struct x86emu *emu, uint32_t d, uint32_t s) { cmp_long(emu, d, s); } /* * REMARKS: * Implements the DAA instruction and side effects. */ static uint8_t daa_byte(struct x86emu *emu, uint8_t d) { uint32_t res = d; if ((d & 0xf) > 9 || ACCESS_FLAG(F_AF)) { res += 6; SET_FLAG(F_AF); } if (res > 0x9F || ACCESS_FLAG(F_CF)) { res += 0x60; SET_FLAG(F_CF); } CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG((res & 0xFF) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return (uint8_t) res; } /* * REMARKS: * Implements the DAS instruction and side effects. */ static uint8_t das_byte(struct x86emu *emu, uint8_t d) { if ((d & 0xf) > 9 || ACCESS_FLAG(F_AF)) { d -= 6; SET_FLAG(F_AF); } if (d > 0x9F || ACCESS_FLAG(F_CF)) { d -= 0x60; SET_FLAG(F_CF); } CONDITIONAL_SET_FLAG(d & 0x80, F_SF); CONDITIONAL_SET_FLAG(d == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(d & 0xff), F_PF); return d; } /* * REMARKS: * Implements the DEC instruction and side effects. */ static uint8_t dec_byte(struct x86emu *emu, uint8_t d) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - 1; CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ /* based on sub_byte, uses s==1. */ bc = (res & (~d | 1)) | (~d & 1); /* carry flag unchanged */ CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return (uint8_t) res; } /* * REMARKS: * Implements the DEC instruction and side effects. */ static uint16_t dec_word(struct x86emu *emu, uint16_t d) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - 1; CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ /* based on the sub_byte routine, with s==1 */ bc = (res & (~d | 1)) | (~d & 1); /* carry flag unchanged */ CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return (uint16_t) res; } /* * REMARKS: * Implements the DEC instruction and side effects. */ static uint32_t dec_long(struct x86emu *emu, uint32_t d) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - 1; CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | 1)) | (~d & 1); /* carry flag unchanged */ CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the INC instruction and side effects. */ static uint8_t inc_byte(struct x86emu *emu, uint8_t d) { uint32_t res; /* all operands in native machine order */ uint32_t cc; res = d + 1; CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = ((1 & d) | (~res)) & (1 | d); CONDITIONAL_SET_FLAG(XOR2(cc >> 6), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return (uint8_t) res; } /* * REMARKS: * Implements the INC instruction and side effects. */ static uint16_t inc_word(struct x86emu *emu, uint16_t d) { uint32_t res; /* all operands in native machine order */ uint32_t cc; res = d + 1; CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (1 & d) | ((~res) & (1 | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 14), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return (uint16_t) res; } /* * REMARKS: * Implements the INC instruction and side effects. */ static uint32_t inc_long(struct x86emu *emu, uint32_t d) { uint32_t res; /* all operands in native machine order */ uint32_t cc; res = d + 1; CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the carry chain SEE NOTE AT TOP. */ cc = (1 & d) | ((~res) & (1 | d)); CONDITIONAL_SET_FLAG(XOR2(cc >> 30), F_OF); CONDITIONAL_SET_FLAG(cc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the OR instruction and side effects. */ static uint8_t or_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint8_t res; /* all operands in native machine order */ res = d | s; CLEAR_FLAG(F_OF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res), F_PF); return res; } /* * REMARKS: * Implements the OR instruction and side effects. */ static uint16_t or_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint16_t res; /* all operands in native machine order */ res = d | s; /* set the carry flag to be bit 8 */ CLEAR_FLAG(F_OF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return res; } /* * REMARKS: * Implements the OR instruction and side effects. */ static uint32_t or_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ res = d | s; /* set the carry flag to be bit 8 */ CLEAR_FLAG(F_OF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); return res; } /* * REMARKS: * Implements the OR instruction and side effects. */ static uint8_t neg_byte(struct x86emu *emu, uint8_t s) { uint8_t res; uint8_t bc; CONDITIONAL_SET_FLAG(s != 0, F_CF); res = (uint8_t) - s; CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(PARITY(res), F_PF); /* calculate the borrow chain --- modified such that d=0. * substitutiing d=0 into bc= res&(~d|s)|(~d&s); (the one used for * sub) and simplifying, since ~d=0xff..., ~d|s == 0xffff..., and * res&0xfff... == res. Similarly ~d&s == s. So the simplified * result is: */ bc = res | s; CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the OR instruction and side effects. */ static uint16_t neg_word(struct x86emu *emu, uint16_t s) { uint16_t res; uint16_t bc; CONDITIONAL_SET_FLAG(s != 0, F_CF); res = (uint16_t) - s; CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain --- modified such that d=0. * substitutiing d=0 into bc= res&(~d|s)|(~d&s); (the one used for * sub) and simplifying, since ~d=0xff..., ~d|s == 0xffff..., and * res&0xfff... == res. Similarly ~d&s == s. So the simplified * result is: */ bc = res | s; CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the OR instruction and side effects. */ static uint32_t neg_long(struct x86emu *emu, uint32_t s) { uint32_t res; uint32_t bc; CONDITIONAL_SET_FLAG(s != 0, F_CF); res = (uint32_t) - s; CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain --- modified such that d=0. * substitutiing d=0 into bc= res&(~d|s)|(~d&s); (the one used for * sub) and simplifying, since ~d=0xff..., ~d|s == 0xffff..., and * res&0xfff... == res. Similarly ~d&s == s. So the simplified * result is: */ bc = res | s; CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the RCL instruction and side effects. */ static uint8_t rcl_byte(struct x86emu *emu, uint8_t d, uint8_t s) { unsigned int res, cnt, mask, cf; /* s is the rotate distance. It varies from 0 - 8. */ /* have * * CF B_7 B_6 B_5 B_4 B_3 B_2 B_1 B_0 * * want to rotate through the carry by "s" bits. We could loop, but * that's inefficient. So the width is 9, and we split into three * parts: * * The new carry flag (was B_n) the stuff in B_n-1 .. B_0 the stuff * in B_7 .. B_n+1 * * The new rotate is done mod 9, and given this, for a rotation of n * bits (mod 9) the new carry flag is then located n bits from the MSB. * The low part is then shifted up cnt bits, and the high part is or'd * in. Using CAPS for new values, and lowercase for the original * values, this can be expressed as: * * IF n > 0 1) CF <- b_(8-n) 2) B_(7) .. B_(n) <- b_(8-(n+1)) .. b_0 * 3) B_(n-1) <- cf 4) B_(n-2) .. B_0 <- b_7 .. b_(8-(n-1)) */ res = d; if ((cnt = s % 9) != 0) { /* extract the new CARRY FLAG. */ /* CF <- b_(8-n) */ cf = (d >> (8 - cnt)) & 0x1; /* * Get the low stuff which rotated into the range B_7 .. B_cnt * B_(7) .. B_(n) <- b_(8-(n+1)) .. b_0 * note that the right hand side done by the mask. */ res = (d << cnt) & 0xff; /* * now the high stuff which rotated around into the positions * B_cnt-2 .. B_0 * B_(n-2) .. B_0 <- b_7 .. b_(8-(n-1)) * shift it downward, 7-(n-2) = 9-n positions. and mask off * the result before or'ing in. */ mask = (1 << (cnt - 1)) - 1; res |= (d >> (9 - cnt)) & mask; /* if the carry flag was set, or it in. */ if (ACCESS_FLAG(F_CF)) { /* carry flag is set */ /* B_(n-1) <- cf */ res |= 1 << (cnt - 1); } /* set the new carry flag, based on the variable "cf" */ CONDITIONAL_SET_FLAG(cf, F_CF); /* OVERFLOW is set *IFF* cnt==1, then it is the xor of CF and * the most significant bit. Blecck. */ /* parenthesized this expression since it appears to be * causing OF to be misset */ CONDITIONAL_SET_FLAG(cnt == 1 && XOR2(cf + ((res >> 6) & 0x2)), F_OF); } return (uint8_t) res; } /* * REMARKS: * Implements the RCL instruction and side effects. */ static uint16_t rcl_word(struct x86emu *emu, uint16_t d, uint8_t s) { unsigned int res, cnt, mask, cf; res = d; if ((cnt = s % 17) != 0) { cf = (d >> (16 - cnt)) & 0x1; res = (d << cnt) & 0xffff; mask = (1 << (cnt - 1)) - 1; res |= (d >> (17 - cnt)) & mask; if (ACCESS_FLAG(F_CF)) { res |= 1 << (cnt - 1); } CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG(cnt == 1 && XOR2(cf + ((res >> 14) & 0x2)), F_OF); } return (uint16_t) res; } /* * REMARKS: * Implements the RCL instruction and side effects. */ static uint32_t rcl_long(struct x86emu *emu, uint32_t d, uint8_t s) { uint32_t res, cnt, mask, cf; res = d; if ((cnt = s % 33) != 0) { cf = (d >> (32 - cnt)) & 0x1; res = (d << cnt) & 0xffffffff; mask = (1 << (cnt - 1)) - 1; res |= (d >> (33 - cnt)) & mask; if (ACCESS_FLAG(F_CF)) { /* carry flag is set */ res |= 1 << (cnt - 1); } CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG(cnt == 1 && XOR2(cf + ((res >> 30) & 0x2)), F_OF); } return res; } /* * REMARKS: * Implements the RCR instruction and side effects. */ static uint8_t rcr_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res, cnt; uint32_t mask, cf, ocf = 0; /* rotate right through carry */ /* s is the rotate distance. It varies from 0 - 8. d is the byte * object rotated. * * have * * CF B_7 B_6 B_5 B_4 B_3 B_2 B_1 B_0 * * The new rotate is done mod 9, and given this, for a rotation of n * bits (mod 9) the new carry flag is then located n bits from the LSB. * The low part is then shifted up cnt bits, and the high part is or'd * in. Using CAPS for new values, and lowercase for the original * values, this can be expressed as: * * IF n > 0 * 1) CF <- b_(n-1) * 2) B_(8-(n+1)) .. B_(0) <- b_(7) .. b_(n) * 3) B_(8-n) <- cf 4) B_(7) .. B_(8-(n-1)) <- b_(n-2) .. b_(0) */ res = d; if ((cnt = s % 9) != 0) { /* extract the new CARRY FLAG. */ /* CF <- b_(n-1) */ if (cnt == 1) { cf = d & 0x1; /* note hackery here. Access_flag(..) evaluates to * either 0 if flag not set non-zero if flag is set. * doing access_flag(..) != 0 casts that into either * 0..1 in any representation of the flags register * (i.e. packed bit array or unpacked.) */ ocf = ACCESS_FLAG(F_CF) != 0; } else cf = (d >> (cnt - 1)) & 0x1; /* B_(8-(n+1)) .. B_(0) <- b_(7) .. b_n */ /* note that the right hand side done by the mask This is * effectively done by shifting the object to the right. The * result must be masked, in case the object came in and was * treated as a negative number. Needed??? */ mask = (1 << (8 - cnt)) - 1; res = (d >> cnt) & mask; /* now the high stuff which rotated around into the positions * B_cnt-2 .. B_0 */ /* B_(7) .. B_(8-(n-1)) <- b_(n-2) .. b_(0) */ /* shift it downward, 7-(n-2) = 9-n positions. and mask off * the result before or'ing in. */ res |= (d << (9 - cnt)); /* if the carry flag was set, or it in. */ if (ACCESS_FLAG(F_CF)) { /* carry flag is set */ /* B_(8-n) <- cf */ res |= 1 << (8 - cnt); } /* set the new carry flag, based on the variable "cf" */ CONDITIONAL_SET_FLAG(cf, F_CF); /* OVERFLOW is set *IFF* cnt==1, then it is the xor of CF and * the most significant bit. Blecck. */ /* parenthesized... */ if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(ocf + ((d >> 6) & 0x2)), F_OF); } } return (uint8_t) res; } /* * REMARKS: * Implements the RCR instruction and side effects. */ static uint16_t rcr_word(struct x86emu *emu, uint16_t d, uint8_t s) { uint32_t res, cnt; uint32_t mask, cf, ocf = 0; /* rotate right through carry */ res = d; if ((cnt = s % 17) != 0) { if (cnt == 1) { cf = d & 0x1; ocf = ACCESS_FLAG(F_CF) != 0; } else cf = (d >> (cnt - 1)) & 0x1; mask = (1 << (16 - cnt)) - 1; res = (d >> cnt) & mask; res |= (d << (17 - cnt)); if (ACCESS_FLAG(F_CF)) { res |= 1 << (16 - cnt); } CONDITIONAL_SET_FLAG(cf, F_CF); if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(ocf + ((d >> 14) & 0x2)), F_OF); } } return (uint16_t) res; } /* * REMARKS: * Implements the RCR instruction and side effects. */ static uint32_t rcr_long(struct x86emu *emu, uint32_t d, uint8_t s) { uint32_t res, cnt; uint32_t mask, cf, ocf = 0; /* rotate right through carry */ res = d; if ((cnt = s % 33) != 0) { if (cnt == 1) { cf = d & 0x1; ocf = ACCESS_FLAG(F_CF) != 0; } else cf = (d >> (cnt - 1)) & 0x1; mask = (1 << (32 - cnt)) - 1; res = (d >> cnt) & mask; if (cnt != 1) res |= (d << (33 - cnt)); if (ACCESS_FLAG(F_CF)) { /* carry flag is set */ res |= 1 << (32 - cnt); } CONDITIONAL_SET_FLAG(cf, F_CF); if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(ocf + ((d >> 30) & 0x2)), F_OF); } } return res; } /* * REMARKS: * Implements the ROL instruction and side effects. */ static uint8_t rol_byte(struct x86emu *emu, uint8_t d, uint8_t s) { unsigned int res, cnt, mask; /* rotate left */ /* s is the rotate distance. It varies from 0 - 8. d is the byte * object rotated. * * have * * CF B_7 ... B_0 * * The new rotate is done mod 8. Much simpler than the "rcl" or "rcr" * operations. * * IF n > 0 1) B_(7) .. B_(n) <- b_(8-(n+1)) .. b_(0) 2) B_(n-1) .. * B_(0) <- b_(7) .. b_(8-n) */ res = d; if ((cnt = s % 8) != 0) { /* B_(7) .. B_(n) <- b_(8-(n+1)) .. b_(0) */ res = (d << cnt); /* B_(n-1) .. B_(0) <- b_(7) .. b_(8-n) */ mask = (1 << cnt) - 1; res |= (d >> (8 - cnt)) & mask; /* OVERFLOW is set *IFF* s==1, then it is the xor of CF and * the most significant bit. Blecck. */ CONDITIONAL_SET_FLAG(s == 1 && XOR2((res & 0x1) + ((res >> 6) & 0x2)), F_OF); } if (s != 0) { /* set the new carry flag, Note that it is the low order bit * of the result!!! */ CONDITIONAL_SET_FLAG(res & 0x1, F_CF); } return (uint8_t) res; } /* * REMARKS: * Implements the ROL instruction and side effects. */ static uint16_t rol_word(struct x86emu *emu, uint16_t d, uint8_t s) { unsigned int res, cnt, mask; res = d; if ((cnt = s % 16) != 0) { res = (d << cnt); mask = (1 << cnt) - 1; res |= (d >> (16 - cnt)) & mask; CONDITIONAL_SET_FLAG(s == 1 && XOR2((res & 0x1) + ((res >> 14) & 0x2)), F_OF); } if (s != 0) { /* set the new carry flag, Note that it is the low order bit * of the result!!! */ CONDITIONAL_SET_FLAG(res & 0x1, F_CF); } return (uint16_t) res; } /* * REMARKS: * Implements the ROL instruction and side effects. */ static uint32_t rol_long(struct x86emu *emu, uint32_t d, uint8_t s) { uint32_t res, cnt, mask; res = d; if ((cnt = s % 32) != 0) { res = (d << cnt); mask = (1 << cnt) - 1; res |= (d >> (32 - cnt)) & mask; CONDITIONAL_SET_FLAG(s == 1 && XOR2((res & 0x1) + ((res >> 30) & 0x2)), F_OF); } if (s != 0) { /* set the new carry flag, Note that it is the low order bit * of the result!!! */ CONDITIONAL_SET_FLAG(res & 0x1, F_CF); } return res; } /* * REMARKS: * Implements the ROR instruction and side effects. */ static uint8_t ror_byte(struct x86emu *emu, uint8_t d, uint8_t s) { unsigned int res, cnt, mask; /* rotate right */ /* s is the rotate distance. It varies from 0 - 8. d is the byte * object rotated. * * have * * B_7 ... B_0 * * The rotate is done mod 8. * * IF n > 0 1) B_(8-(n+1)) .. B_(0) <- b_(7) .. b_(n) 2) B_(7) .. * B_(8-n) <- b_(n-1) .. b_(0) */ res = d; if ((cnt = s % 8) != 0) { /* not a typo, do nada if cnt==0 */ /* B_(7) .. B_(8-n) <- b_(n-1) .. b_(0) */ res = (d << (8 - cnt)); /* B_(8-(n+1)) .. B_(0) <- b_(7) .. b_(n) */ mask = (1 << (8 - cnt)) - 1; res |= (d >> (cnt)) & mask; /* OVERFLOW is set *IFF* s==1, then it is the xor of the two * most significant bits. Blecck. */ CONDITIONAL_SET_FLAG(s == 1 && XOR2(res >> 6), F_OF); } if (s != 0) { /* set the new carry flag, Note that it is the high order bit * of the result!!! */ CONDITIONAL_SET_FLAG(res & 0x80, F_CF); } return (uint8_t) res; } /* * REMARKS: * Implements the ROR instruction and side effects. */ static uint16_t ror_word(struct x86emu *emu, uint16_t d, uint8_t s) { unsigned int res, cnt, mask; res = d; if ((cnt = s % 16) != 0) { res = (d << (16 - cnt)); mask = (1 << (16 - cnt)) - 1; res |= (d >> (cnt)) & mask; CONDITIONAL_SET_FLAG(s == 1 && XOR2(res >> 14), F_OF); } if (s != 0) { /* set the new carry flag, Note that it is the high order bit * of the result!!! */ CONDITIONAL_SET_FLAG(res & 0x8000, F_CF); } return (uint16_t) res; } /* * REMARKS: * Implements the ROR instruction and side effects. */ static uint32_t ror_long(struct x86emu *emu, uint32_t d, uint8_t s) { uint32_t res, cnt, mask; res = d; if ((cnt = s % 32) != 0) { res = (d << (32 - cnt)); mask = (1 << (32 - cnt)) - 1; res |= (d >> (cnt)) & mask; CONDITIONAL_SET_FLAG(s == 1 && XOR2(res >> 30), F_OF); } if (s != 0) { /* set the new carry flag, Note that it is the high order bit * of the result!!! */ CONDITIONAL_SET_FLAG(res & 0x80000000, F_CF); } return res; } /* * REMARKS: * Implements the SHL instruction and side effects. */ static uint8_t shl_byte(struct x86emu *emu, uint8_t d, uint8_t s) { unsigned int cnt, res, cf; if (s < 8) { cnt = s % 8; /* last bit shifted out goes into carry flag */ if (cnt > 0) { res = d << cnt; cf = d & (1 << (8 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = (uint8_t) d; } if (cnt == 1) { /* Needs simplification. */ CONDITIONAL_SET_FLAG( (((res & 0x80) == 0x80) ^ (ACCESS_FLAG(F_CF) != 0)), /* was (emu->x86.R_FLG&F_CF)==F_CF)), */ F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x80, F_CF); CLEAR_FLAG(F_OF); CLEAR_FLAG(F_SF); SET_FLAG(F_PF); SET_FLAG(F_ZF); } return (uint8_t) res; } /* * REMARKS: * Implements the SHL instruction and side effects. */ static uint16_t shl_word(struct x86emu *emu, uint16_t d, uint8_t s) { unsigned int cnt, res, cf; if (s < 16) { cnt = s % 16; if (cnt > 0) { res = d << cnt; cf = d & (1 << (16 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = (uint16_t) d; } if (cnt == 1) { CONDITIONAL_SET_FLAG( (((res & 0x8000) == 0x8000) ^ (ACCESS_FLAG(F_CF) != 0)), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x8000, F_CF); CLEAR_FLAG(F_OF); CLEAR_FLAG(F_SF); SET_FLAG(F_PF); SET_FLAG(F_ZF); } return (uint16_t) res; } /* * REMARKS: * Implements the SHL instruction and side effects. */ static uint32_t shl_long(struct x86emu *emu, uint32_t d, uint8_t s) { unsigned int cnt, res, cf; if (s < 32) { cnt = s % 32; if (cnt > 0) { res = d << cnt; cf = d & (1 << (32 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG((((res & 0x80000000) == 0x80000000) ^ (ACCESS_FLAG(F_CF) != 0)), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x80000000, F_CF); CLEAR_FLAG(F_OF); CLEAR_FLAG(F_SF); SET_FLAG(F_PF); SET_FLAG(F_ZF); } return res; } /* * REMARKS: * Implements the SHR instruction and side effects. */ static uint8_t shr_byte(struct x86emu *emu, uint8_t d, uint8_t s) { unsigned int cnt, res, cf; if (s < 8) { cnt = s % 8; if (cnt > 0) { cf = d & (1 << (cnt - 1)); res = d >> cnt; CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = (uint8_t) d; } if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(res >> 6), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CONDITIONAL_SET_FLAG((d >> (s - 1)) & 0x1, F_CF); CLEAR_FLAG(F_OF); CLEAR_FLAG(F_SF); SET_FLAG(F_PF); SET_FLAG(F_ZF); } return (uint8_t) res; } /* * REMARKS: * Implements the SHR instruction and side effects. */ static uint16_t shr_word(struct x86emu *emu, uint16_t d, uint8_t s) { unsigned int cnt, res, cf; if (s < 16) { cnt = s % 16; if (cnt > 0) { cf = d & (1 << (cnt - 1)); res = d >> cnt; CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(res >> 14), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } return (uint16_t) res; } /* * REMARKS: * Implements the SHR instruction and side effects. */ static uint32_t shr_long(struct x86emu *emu, uint32_t d, uint8_t s) { unsigned int cnt, res, cf; if (s < 32) { cnt = s % 32; if (cnt > 0) { cf = d & (1 << (cnt - 1)); res = d >> cnt; CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(res >> 30), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } return res; } /* * REMARKS: * Implements the SAR instruction and side effects. */ static uint8_t sar_byte(struct x86emu *emu, uint8_t d, uint8_t s) { unsigned int cnt, res, cf, mask, sf; res = d; sf = d & 0x80; cnt = s % 8; if (cnt > 0 && cnt < 8) { mask = (1 << (8 - cnt)) - 1; cf = d & (1 << (cnt - 1)); res = (d >> cnt) & mask; CONDITIONAL_SET_FLAG(cf, F_CF); if (sf) { res |= ~mask; } CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); } else if (cnt >= 8) { if (sf) { res = 0xff; SET_FLAG(F_CF); CLEAR_FLAG(F_ZF); SET_FLAG(F_SF); SET_FLAG(F_PF); } else { res = 0; CLEAR_FLAG(F_CF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } } return (uint8_t) res; } /* * REMARKS: * Implements the SAR instruction and side effects. */ static uint16_t sar_word(struct x86emu *emu, uint16_t d, uint8_t s) { unsigned int cnt, res, cf, mask, sf; sf = d & 0x8000; cnt = s % 16; res = d; if (cnt > 0 && cnt < 16) { mask = (1 << (16 - cnt)) - 1; cf = d & (1 << (cnt - 1)); res = (d >> cnt) & mask; CONDITIONAL_SET_FLAG(cf, F_CF); if (sf) { res |= ~mask; } CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else if (cnt >= 16) { if (sf) { res = 0xffff; SET_FLAG(F_CF); CLEAR_FLAG(F_ZF); SET_FLAG(F_SF); SET_FLAG(F_PF); } else { res = 0; CLEAR_FLAG(F_CF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } } return (uint16_t) res; } /* * REMARKS: * Implements the SAR instruction and side effects. */ static uint32_t sar_long(struct x86emu *emu, uint32_t d, uint8_t s) { uint32_t cnt, res, cf, mask, sf; sf = d & 0x80000000; cnt = s % 32; res = d; if (cnt > 0 && cnt < 32) { mask = (1 << (32 - cnt)) - 1; cf = d & (1 << (cnt - 1)); res = (d >> cnt) & mask; CONDITIONAL_SET_FLAG(cf, F_CF); if (sf) { res |= ~mask; } CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else if (cnt >= 32) { if (sf) { res = 0xffffffff; SET_FLAG(F_CF); CLEAR_FLAG(F_ZF); SET_FLAG(F_SF); SET_FLAG(F_PF); } else { res = 0; CLEAR_FLAG(F_CF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } } return res; } /* * REMARKS: * Implements the SHLD instruction and side effects. */ static uint16_t shld_word(struct x86emu *emu, uint16_t d, uint16_t fill, uint8_t s) { unsigned int cnt, res, cf; if (s < 16) { cnt = s % 16; if (cnt > 0) { res = (d << cnt) | (fill >> (16 - cnt)); cf = d & (1 << (16 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG((((res & 0x8000) == 0x8000) ^ (ACCESS_FLAG(F_CF) != 0)), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x8000, F_CF); CLEAR_FLAG(F_OF); CLEAR_FLAG(F_SF); SET_FLAG(F_PF); SET_FLAG(F_ZF); } return (uint16_t) res; } /* * REMARKS: * Implements the SHLD instruction and side effects. */ static uint32_t shld_long(struct x86emu *emu, uint32_t d, uint32_t fill, uint8_t s) { unsigned int cnt, res, cf; if (s < 32) { cnt = s % 32; if (cnt > 0) { res = (d << cnt) | (fill >> (32 - cnt)); cf = d & (1 << (32 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG((((res & 0x80000000) == 0x80000000) ^ (ACCESS_FLAG(F_CF) != 0)), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x80000000, F_CF); CLEAR_FLAG(F_OF); CLEAR_FLAG(F_SF); SET_FLAG(F_PF); SET_FLAG(F_ZF); } return res; } /* * REMARKS: * Implements the SHRD instruction and side effects. */ static uint16_t shrd_word(struct x86emu *emu, uint16_t d, uint16_t fill, uint8_t s) { unsigned int cnt, res, cf; if (s < 16) { cnt = s % 16; if (cnt > 0) { cf = d & (1 << (cnt - 1)); res = (d >> cnt) | (fill << (16 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(res >> 14), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } return (uint16_t) res; } /* * REMARKS: * Implements the SHRD instruction and side effects. */ static uint32_t shrd_long(struct x86emu *emu, uint32_t d, uint32_t fill, uint8_t s) { unsigned int cnt, res, cf; if (s < 32) { cnt = s % 32; if (cnt > 0) { cf = d & (1 << (cnt - 1)); res = (d >> cnt) | (fill << (32 - cnt)); CONDITIONAL_SET_FLAG(cf, F_CF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); } else { res = d; } if (cnt == 1) { CONDITIONAL_SET_FLAG(XOR2(res >> 30), F_OF); } else { CLEAR_FLAG(F_OF); } } else { res = 0; CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); SET_FLAG(F_ZF); CLEAR_FLAG(F_SF); CLEAR_FLAG(F_PF); } return res; } /* * REMARKS: * Implements the SBB instruction and side effects. */ static uint8_t sbb_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; if (ACCESS_FLAG(F_CF)) res = d - s - 1; else res = d - s; CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x80, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return (uint8_t) res; } /* * REMARKS: * Implements the SBB instruction and side effects. */ static uint16_t sbb_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; if (ACCESS_FLAG(F_CF)) res = d - s - 1; else res = d - s; CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x8000, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return (uint16_t) res; } /* * REMARKS: * Implements the SBB instruction and side effects. */ static uint32_t sbb_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; if (ACCESS_FLAG(F_CF)) res = d - s - 1; else res = d - s; CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x80000000, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the SUB instruction and side effects. */ static uint8_t sub_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - s; CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x80, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return (uint8_t) res; } /* * REMARKS: * Implements the SUB instruction and side effects. */ static uint16_t sub_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - s; CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x8000, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return (uint16_t) res; } /* * REMARKS: * Implements the SUB instruction and side effects. */ static uint32_t sub_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ uint32_t bc; res = d - s; CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* calculate the borrow chain. See note at top */ bc = (res & (~d | s)) | (~d & s); CONDITIONAL_SET_FLAG(bc & 0x80000000, F_CF); CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF); CONDITIONAL_SET_FLAG(bc & 0x8, F_AF); return res; } /* * REMARKS: * Implements the TEST instruction and side effects. */ static void test_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint32_t res; /* all operands in native machine order */ res = d & s; CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* AF == dont care */ CLEAR_FLAG(F_CF); } /* * REMARKS: * Implements the TEST instruction and side effects. */ static void test_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint32_t res; /* all operands in native machine order */ res = d & s; CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* AF == dont care */ CLEAR_FLAG(F_CF); } /* * REMARKS: * Implements the TEST instruction and side effects. */ static void test_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ res = d & s; CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); /* AF == dont care */ CLEAR_FLAG(F_CF); } /* * REMARKS: * Implements the XOR instruction and side effects. */ static uint8_t xor_byte(struct x86emu *emu, uint8_t d, uint8_t s) { uint8_t res; /* all operands in native machine order */ res = d ^ s; CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(res & 0x80, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res), F_PF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); return res; } /* * REMARKS: * Implements the XOR instruction and side effects. */ static uint16_t xor_word(struct x86emu *emu, uint16_t d, uint16_t s) { uint16_t res; /* all operands in native machine order */ res = d ^ s; CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(res & 0x8000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); return res; } /* * REMARKS: * Implements the XOR instruction and side effects. */ static uint32_t xor_long(struct x86emu *emu, uint32_t d, uint32_t s) { uint32_t res; /* all operands in native machine order */ res = d ^ s; CLEAR_FLAG(F_OF); CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF); CONDITIONAL_SET_FLAG(res == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF); CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); return res; } /* * REMARKS: * Implements the IMUL instruction and side effects. */ static void imul_byte(struct x86emu *emu, uint8_t s) { int16_t res = (int16_t) ((int8_t) emu->x86.R_AL * (int8_t) s); emu->x86.R_AX = res; if (((emu->x86.R_AL & 0x80) == 0 && emu->x86.R_AH == 0x00) || ((emu->x86.R_AL & 0x80) != 0 && emu->x86.R_AH == 0xFF)) { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } else { SET_FLAG(F_CF); SET_FLAG(F_OF); } } /* * REMARKS: * Implements the IMUL instruction and side effects. */ static void imul_word(struct x86emu *emu, uint16_t s) { int32_t res = (int16_t) emu->x86.R_AX * (int16_t) s; emu->x86.R_AX = (uint16_t) res; emu->x86.R_DX = (uint16_t) (res >> 16); if (((emu->x86.R_AX & 0x8000) == 0 && emu->x86.R_DX == 0x00) || ((emu->x86.R_AX & 0x8000) != 0 && emu->x86.R_DX == 0xFF)) { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } else { SET_FLAG(F_CF); SET_FLAG(F_OF); } } /* * REMARKS: * Implements the IMUL instruction and side effects. */ static void imul_long(struct x86emu *emu, uint32_t s) { int64_t res; res = (int64_t)(int32_t)emu->x86.R_EAX * (int32_t)s; emu->x86.R_EAX = (uint32_t)res; emu->x86.R_EDX = ((uint64_t)res) >> 32; if (((emu->x86.R_EAX & 0x80000000) == 0 && emu->x86.R_EDX == 0x00) || ((emu->x86.R_EAX & 0x80000000) != 0 && emu->x86.R_EDX == 0xFF)) { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } else { SET_FLAG(F_CF); SET_FLAG(F_OF); } } /* * REMARKS: * Implements the MUL instruction and side effects. */ static void mul_byte(struct x86emu *emu, uint8_t s) { uint16_t res = (uint16_t) (emu->x86.R_AL * s); emu->x86.R_AX = res; if (emu->x86.R_AH == 0) { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } else { SET_FLAG(F_CF); SET_FLAG(F_OF); } } /* * REMARKS: * Implements the MUL instruction and side effects. */ static void mul_word(struct x86emu *emu, uint16_t s) { uint32_t res = emu->x86.R_AX * s; emu->x86.R_AX = (uint16_t) res; emu->x86.R_DX = (uint16_t) (res >> 16); if (emu->x86.R_DX == 0) { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } else { SET_FLAG(F_CF); SET_FLAG(F_OF); } } /* * REMARKS: * Implements the MUL instruction and side effects. */ static void mul_long(struct x86emu *emu, uint32_t s) { uint64_t res = (uint64_t) emu->x86.R_EAX * s; emu->x86.R_EAX = (uint32_t) res; emu->x86.R_EDX = (uint32_t) (res >> 32); if (emu->x86.R_EDX == 0) { CLEAR_FLAG(F_CF); CLEAR_FLAG(F_OF); } else { SET_FLAG(F_CF); SET_FLAG(F_OF); } } /* * REMARKS: * Implements the IDIV instruction and side effects. */ static void idiv_byte(struct x86emu *emu, uint8_t s) { int32_t dvd, div, mod; dvd = (int16_t) emu->x86.R_AX; if (s == 0) { x86emu_intr_raise(emu, 8); return; } div = dvd / (int8_t) s; mod = dvd % (int8_t) s; if (div > 0x7f || div < -0x7f) { x86emu_intr_raise(emu, 8); return; } emu->x86.R_AL = (int8_t) div; emu->x86.R_AH = (int8_t) mod; } /* * REMARKS: * Implements the IDIV instruction and side effects. */ static void idiv_word(struct x86emu *emu, uint16_t s) { int32_t dvd, div, mod; dvd = (((int32_t) emu->x86.R_DX) << 16) | emu->x86.R_AX; if (s == 0) { x86emu_intr_raise(emu, 8); return; } div = dvd / (int16_t) s; mod = dvd % (int16_t) s; if (div > 0x7fff || div < -0x7fff) { x86emu_intr_raise(emu, 8); return; } CLEAR_FLAG(F_CF); CLEAR_FLAG(F_SF); CONDITIONAL_SET_FLAG(div == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF); emu->x86.R_AX = (uint16_t) div; emu->x86.R_DX = (uint16_t) mod; } /* * REMARKS: * Implements the IDIV instruction and side effects. */ static void idiv_long(struct x86emu *emu, uint32_t s) { int64_t dvd, div, mod; dvd = (((int64_t) emu->x86.R_EDX) << 32) | emu->x86.R_EAX; if (s == 0) { x86emu_intr_raise(emu, 8); return; } div = dvd / (int32_t) s; mod = dvd % (int32_t) s; if (div > 0x7fffffff || div < -0x7fffffff) { x86emu_intr_raise(emu, 8); return; } CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CLEAR_FLAG(F_SF); SET_FLAG(F_ZF); CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF); emu->x86.R_EAX = (uint32_t) div; emu->x86.R_EDX = (uint32_t) mod; } /* * REMARKS: * Implements the DIV instruction and side effects. */ static void div_byte(struct x86emu *emu, uint8_t s) { uint32_t dvd, div, mod; dvd = emu->x86.R_AX; if (s == 0) { x86emu_intr_raise(emu, 8); return; } div = dvd / (uint8_t) s; mod = dvd % (uint8_t) s; if (div > 0xff) { x86emu_intr_raise(emu, 8); return; } emu->x86.R_AL = (uint8_t) div; emu->x86.R_AH = (uint8_t) mod; } /* * REMARKS: * Implements the DIV instruction and side effects. */ static void div_word(struct x86emu *emu, uint16_t s) { uint32_t dvd, div, mod; dvd = (((uint32_t) emu->x86.R_DX) << 16) | emu->x86.R_AX; if (s == 0) { x86emu_intr_raise(emu, 8); return; } div = dvd / (uint16_t) s; mod = dvd % (uint16_t) s; if (div > 0xffff) { x86emu_intr_raise(emu, 8); return; } CLEAR_FLAG(F_CF); CLEAR_FLAG(F_SF); CONDITIONAL_SET_FLAG(div == 0, F_ZF); CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF); emu->x86.R_AX = (uint16_t) div; emu->x86.R_DX = (uint16_t) mod; } /* * REMARKS: * Implements the DIV instruction and side effects. */ static void div_long(struct x86emu *emu, uint32_t s) { uint64_t dvd, div, mod; dvd = (((uint64_t) emu->x86.R_EDX) << 32) | emu->x86.R_EAX; if (s == 0) { x86emu_intr_raise(emu, 8); return; } div = dvd / (uint32_t) s; mod = dvd % (uint32_t) s; if (div > 0xffffffff) { x86emu_intr_raise(emu, 8); return; } CLEAR_FLAG(F_CF); CLEAR_FLAG(F_AF); CLEAR_FLAG(F_SF); SET_FLAG(F_ZF); CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF); emu->x86.R_EAX = (uint32_t) div; emu->x86.R_EDX = (uint32_t) mod; } /* * REMARKS: * Implements the IN string instruction and side effects. */ static void ins(struct x86emu *emu, int size) { int inc = size; if (ACCESS_FLAG(F_DF)) { inc = -size; } if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* in until CX is ZERO. */ uint32_t count = ((emu->x86.mode & SYSMODE_PREFIX_DATA) ? emu->x86.R_ECX : emu->x86.R_CX); switch (size) { case 1: while (count--) { store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, (*emu->emu_inb) (emu, emu->x86.R_DX)); emu->x86.R_DI += inc; } break; case 2: while (count--) { store_word(emu, emu->x86.R_ES, emu->x86.R_DI, (*emu->emu_inw) (emu, emu->x86.R_DX)); emu->x86.R_DI += inc; } break; case 4: while (count--) { store_long(emu, emu->x86.R_ES, emu->x86.R_DI, (*emu->emu_inl) (emu, emu->x86.R_DX)); emu->x86.R_DI += inc; break; } } emu->x86.R_CX = 0; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_ECX = 0; } emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } else { switch (size) { case 1: store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, (*emu->emu_inb) (emu, emu->x86.R_DX)); break; case 2: store_word(emu, emu->x86.R_ES, emu->x86.R_DI, (*emu->emu_inw) (emu, emu->x86.R_DX)); break; case 4: store_long(emu, emu->x86.R_ES, emu->x86.R_DI, (*emu->emu_inl) (emu, emu->x86.R_DX)); break; } emu->x86.R_DI += inc; } } /* * REMARKS: * Implements the OUT string instruction and side effects. */ static void outs(struct x86emu *emu, int size) { int inc = size; if (ACCESS_FLAG(F_DF)) { inc = -size; } if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) { /* dont care whether REPE or REPNE */ /* out until CX is ZERO. */ uint32_t count = ((emu->x86.mode & SYSMODE_PREFIX_DATA) ? emu->x86.R_ECX : emu->x86.R_CX); switch (size) { case 1: while (count--) { (*emu->emu_outb) (emu, emu->x86.R_DX, fetch_byte(emu, emu->x86.R_ES, emu->x86.R_SI)); emu->x86.R_SI += inc; } break; case 2: while (count--) { (*emu->emu_outw) (emu, emu->x86.R_DX, fetch_word(emu, emu->x86.R_ES, emu->x86.R_SI)); emu->x86.R_SI += inc; } break; case 4: while (count--) { (*emu->emu_outl) (emu, emu->x86.R_DX, fetch_long(emu, emu->x86.R_ES, emu->x86.R_SI)); emu->x86.R_SI += inc; break; } } emu->x86.R_CX = 0; if (emu->x86.mode & SYSMODE_PREFIX_DATA) { emu->x86.R_ECX = 0; } emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE); } else { switch (size) { case 1: (*emu->emu_outb) (emu, emu->x86.R_DX, fetch_byte(emu, emu->x86.R_ES, emu->x86.R_SI)); break; case 2: (*emu->emu_outw) (emu, emu->x86.R_DX, fetch_word(emu, emu->x86.R_ES, emu->x86.R_SI)); break; case 4: (*emu->emu_outl) (emu, emu->x86.R_DX, fetch_long(emu, emu->x86.R_ES, emu->x86.R_SI)); break; } emu->x86.R_SI += inc; } } /* * REMARKS: * Pushes a word onto the stack. * * NOTE: Do not inline this, as (*emu->emu_wrX) is already inline! */ static void push_word(struct x86emu *emu, uint16_t w) { emu->x86.R_SP -= 2; store_word(emu, emu->x86.R_SS, emu->x86.R_SP, w); } /* * REMARKS: * Pushes a long onto the stack. * * NOTE: Do not inline this, as (*emu->emu_wrX) is already inline! */ static void push_long(struct x86emu *emu, uint32_t w) { emu->x86.R_SP -= 4; store_long(emu, emu->x86.R_SS, emu->x86.R_SP, w); } /* * REMARKS: * Pops a word from the stack. * * NOTE: Do not inline this, as (*emu->emu_rdX) is already inline! */ static uint16_t pop_word(struct x86emu *emu) { uint16_t res; res = fetch_word(emu, emu->x86.R_SS, emu->x86.R_SP); emu->x86.R_SP += 2; return res; } /* * REMARKS: * Pops a long from the stack. * * NOTE: Do not inline this, as (*emu->emu_rdX) is already inline! */ static uint32_t pop_long(struct x86emu *emu) { uint32_t res; res = fetch_long(emu, emu->x86.R_SS, emu->x86.R_SP); emu->x86.R_SP += 4; return res; }
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