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autoconf.c
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bus_machdep.c
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bus_space_asm.S
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busdma_bounce.c
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busdma_machdep.c
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bzero.S
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clock.c
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copyinout.S
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cpu_errata.c
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cpufunc_asm.S
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db_disasm.c
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db_interface.c
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db_trace.c
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debug_monitor.c
(14.85 KB)
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disassem.c
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dump_machdep.c
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efirt_machdep.c
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elf32_machdep.c
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elf_machdep.c
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exception.S
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freebsd32_machdep.c
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gdb_machdep.c
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genassym.c
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gic_v3.c
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gic_v3_acpi.c
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gic_v3_fdt.c
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gic_v3_reg.h
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gic_v3_var.h
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gicv3_its.c
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identcpu.c
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in_cksum.c
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locore.S
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machdep.c
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machdep_boot.c
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mem.c
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memcpy.S
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memmove.S
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minidump_machdep.c
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mp_machdep.c
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nexus.c
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ofw_machdep.c
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pmap.c
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stack_machdep.c
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support.S
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swtch.S
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sys_machdep.c
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trap.c
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uio_machdep.c
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uma_machdep.c
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undefined.c
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unwind.c
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vfp.c
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vm_machdep.c
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Editing: disassem.c
/*- * Copyright (c) 2016 Cavium * All rights reserved. * * This software was developed by Semihalf. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/systm.h> #include <machine/disassem.h> #include <machine/armreg.h> #include <ddb/ddb.h> #define ARM64_MAX_TOKEN_LEN 8 #define ARM64_MAX_TOKEN_CNT 10 #define ARM_INSN_SIZE_OFFSET 30 #define ARM_INSN_SIZE_MASK 0x3 /* Special options for instruction printing */ #define OP_SIGN_EXT (1UL << 0) /* Sign-extend immediate value */ #define OP_LITERAL (1UL << 1) /* Use literal (memory offset) */ #define OP_MULT_4 (1UL << 2) /* Multiply immediate by 4 */ #define OP_SF32 (1UL << 3) /* Force 32-bit access */ #define OP_SF_INV (1UL << 6) /* SF is inverted (1 means 32 bit access) */ static const char *w_reg[] = { "w0", "w1", "w2", "w3", "w4", "w5", "w6", "w7", "w8", "w9", "w10", "w11", "w12", "w13", "w14", "w15", "w16", "w17", "w18", "w19", "w20", "w21", "w22", "w23", "w24", "w25", "w26", "w27", "w28", "w29", "w30", "wSP", }; static const char *x_reg[] = { "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23", "x24", "x25", "x26", "x27", "x28", "x29", "LR", "SP", }; static const char *shift_2[] = { "LSL", "LSR", "ASR", "RSV" }; /* * Structure representing single token (operand) inside instruction. * name - name of operand * pos - position within the instruction (in bits) * len - operand length (in bits) */ struct arm64_insn_token { char name[ARM64_MAX_TOKEN_LEN]; int pos; int len; }; /* * Define generic types for instruction printing. */ enum arm64_format_type { TYPE_01, /* OP <RD>, <RN>, <RM>{, <shift [LSL, LSR, ASR]> #<imm>} SF32/64 OP <RD>, <RN>, #<imm>{, <shift [0, 12]>} SF32/64 */ TYPE_02, /* OP <RT>, [<RN>, #<imm>]{!}] SF32/64 OP <RT>, [<RN>], #<imm>{!} SF32/64 OP <RT>, <RN>, <RM> {, EXTEND AMOUNT } */ TYPE_03, /* OP <RT>, #imm SF32/64 */ }; /* * Structure representing single parsed instruction format. * name - opcode name * format - opcode format in a human-readable way * type - syntax type for printing * special_ops - special options passed to a printer (if any) * mask - bitmask for instruction matching * pattern - pattern to look for * tokens - array of tokens (operands) inside instruction */ struct arm64_insn { char* name; char* format; enum arm64_format_type type; uint64_t special_ops; uint32_t mask; uint32_t pattern; struct arm64_insn_token tokens[ARM64_MAX_TOKEN_CNT]; }; /* * Specify instruction opcode format in a human-readable way. Use notation * obtained from ARM Architecture Reference Manual for ARMv8-A. * * Format string description: * Each group must be separated by "|". Group made of 0/1 is used to * generate mask and pattern for instruction matching. Groups containing * an operand token (in format NAME(length_bits)) are used to retrieve any * operand data from the instruction. Names here must be meaningful * and match the one described in the Manual. * * Token description: * SF - "0" represents 32-bit access, "1" represents 64-bit access * SHIFT - type of shift (instruction dependent) * IMM - immediate value * Rx - register number * OPTION - command specific options * SCALE - scaling of immediate value */ static struct arm64_insn arm64_i[] = { { "add", "SF(1)|0001011|SHIFT(2)|0|RM(5)|IMM(6)|RN(5)|RD(5)", TYPE_01, 0 }, { "mov", "SF(1)|001000100000000000000|RN(5)|RD(5)", TYPE_01, 0 }, { "add", "SF(1)|0010001|SHIFT(2)|IMM(12)|RN(5)|RD(5)", TYPE_01, 0 }, { "ldr", "1|SF(1)|111000010|IMM(9)|OPTION(2)|RN(5)|RT(5)", TYPE_02, OP_SIGN_EXT }, /* ldr immediate post/pre index */ { "ldr", "1|SF(1)|11100101|IMM(12)|RN(5)|RT(5)", TYPE_02, 0 }, /* ldr immediate unsigned */ { "ldr", "1|SF(1)|111000011|RM(5)|OPTION(3)|SCALE(1)|10|RN(5)|RT(5)", TYPE_02, 0 }, /* ldr register */ { "ldr", "0|SF(1)|011000|IMM(19)|RT(5)", TYPE_03, OP_SIGN_EXT | OP_LITERAL | OP_MULT_4 }, /* ldr literal */ { "ldrb", "00|111000010|IMM(9)|OPTION(2)|RN(5)|RT(5)", TYPE_02, OP_SIGN_EXT | OP_SF32 }, /* ldrb immediate post/pre index */ { "ldrb", "00|11100101|IMM(12)|RN(5)|RT(5)", TYPE_02, OP_SF32 }, /* ldrb immediate unsigned */ { "ldrb", "00|111000011|RM(5)|OPTION(3)|SCALE(1)|10|RN(5)|RT(5)", TYPE_02, OP_SF32 }, /* ldrb register */ { "ldrh", "01|111000010|IMM(9)|OPTION(2)|RN(5)|RT(5)", TYPE_02, OP_SIGN_EXT | OP_SF32 }, /* ldrh immediate post/pre index */ { "ldrh", "01|11100101|IMM(12)|RN(5)|RT(5)", TYPE_02, OP_SF32 }, /* ldrh immediate unsigned */ { "ldrh", "01|111000011|RM(5)|OPTION(3)|SCALE(1)|10|RN(5)|RT(5)", TYPE_02, OP_SF32 }, /* ldrh register */ { "ldrsb", "001110001|SF(1)|0|IMM(9)|OPTION(2)|RN(5)|RT(5)", TYPE_02, OP_SIGN_EXT | OP_SF_INV }, /* ldrsb immediate post/pre index */ { "ldrsb", "001110011|SF(1)|IMM(12)|RN(5)|RT(5)",\ TYPE_02, OP_SF_INV}, /* ldrsb immediate unsigned */ { "ldrsb", "001110001|SF(1)|1|RM(5)|OPTION(3)|SCALE(1)|10|RN(5)|RT(5)", TYPE_02, OP_SF_INV }, /* ldrsb register */ { "ldrsh", "011110001|SF(1)|0|IMM(9)|OPTION(2)|RN(5)|RT(5)", TYPE_02, OP_SIGN_EXT | OP_SF_INV }, /* ldrsh immediate post/pre index */ { "ldrsh", "011110011|SF(1)|IMM(12)|RN(5)|RT(5)", TYPE_02, OP_SF_INV}, /* ldrsh immediate unsigned */ { "ldrsh", "011110001|SF(1)|1|RM(5)|OPTION(3)|SCALE(1)|10|RN(5)|RT(5)", TYPE_02, OP_SF_INV }, /* ldrsh register */ { "ldrsw", "10111000100|IMM(9)|OPTION(2)|RN(5)|RT(5)", TYPE_02, OP_SIGN_EXT }, /* ldrsw immediate post/pre index */ { "ldrsw", "1011100110|IMM(12)|RN(5)|RT(5)", TYPE_02, 0 }, /* ldrsw immediate unsigned */ { "ldrsw", "10111000101|RM(5)|OPTION(3)|SCALE(1)|10|RN(5)|RT(5)", TYPE_02, 0 }, /* ldrsw register */ { "ldrsw", "10011000|IMM(19)|RT(5)", TYPE_03, OP_SIGN_EXT | OP_LITERAL | OP_MULT_4 }, /* ldr literal */ { NULL, NULL } }; static void arm64_disasm_generate_masks(struct arm64_insn *tab) { uint32_t mask, val; int a, i; int len, ret; int token = 0; char *format; int error; while (tab->name != NULL) { mask = 0; val = 0; format = tab->format; token = 0; error = 0; /* * For each entry analyze format strings from the * left (i.e. from the MSB). */ a = (INSN_SIZE * NBBY) - 1; while (*format != '\0' && (a >= 0)) { switch(*format) { case '0': /* Bit is 0, add to mask and pattern */ mask |= (1 << a); a--; format++; break; case '1': /* Bit is 1, add to mask and pattern */ mask |= (1 << a); val |= (1 << a); a--; format++; break; case '|': /* skip */ format++; break; default: /* Token found, copy the name */ memset(tab->tokens[token].name, 0, sizeof(tab->tokens[token].name)); i = 0; while (*format != '(') { tab->tokens[token].name[i] = *format; i++; format++; if (i >= ARM64_MAX_TOKEN_LEN) { printf("ERROR: token too long in op %s\n", tab->name); error = 1; break; } } if (error != 0) break; /* Read the length value */ ret = sscanf(format, "(%d)", &len); if (ret == 1) { if (token >= ARM64_MAX_TOKEN_CNT) { printf("ERROR: to many tokens in op %s\n", tab->name); error = 1; break; } a -= len; tab->tokens[token].pos = a + 1; tab->tokens[token].len = len; token++; } /* Skip to the end of the token */ while (*format != 0 && *format != '|') format++; } } /* Write mask and pattern to the instruction array */ tab->mask = mask; tab->pattern = val; /* * If we got here, format string must be parsed and "a" * should point to -1. If it's not, wrong number of bits * in format string. Mark this as invalid and prevent * from being matched. */ if (*format != 0 || (a != -1) || (error != 0)) { tab->mask = 0; tab->pattern = 0xffffffff; printf("ERROR: skipping instruction op %s\n", tab->name); } tab++; } } static int arm64_disasm_read_token(struct arm64_insn *insn, u_int opcode, const char *token, int *val) { int i; for (i = 0; i < ARM64_MAX_TOKEN_CNT; i++) { if (strcmp(insn->tokens[i].name, token) == 0) { *val = (opcode >> insn->tokens[i].pos & ((1 << insn->tokens[i].len) - 1)); return (0); } } return (EINVAL); } static int arm64_disasm_read_token_sign_ext(struct arm64_insn *insn, u_int opcode, const char *token, int *val) { int i; int msk; for (i = 0; i < ARM64_MAX_TOKEN_CNT; i++) { if (strcmp(insn->tokens[i].name, token) == 0) { msk = (1 << insn->tokens[i].len) - 1; *val = ((opcode >> insn->tokens[i].pos) & msk); /* If last bit is 1, sign-extend the value */ if (*val & (1 << (insn->tokens[i].len - 1))) *val |= ~msk; return (0); } } return (EINVAL); } static const char * arm64_reg(int b64, int num) { if (b64 != 0) return (x_reg[num]); return (w_reg[num]); } vm_offset_t disasm(const struct disasm_interface *di, vm_offset_t loc, int altfmt) { struct arm64_insn *i_ptr = arm64_i; uint32_t insn; int matchp; int ret; int shift, rm, rt, rd, rn, imm, sf, idx, option, scale, amount; int sign_ext; int rm_absent; /* Indicate if immediate should be outside or inside brackets */ int inside; /* Print exclamation mark if pre-incremented */ int pre; /* Initialize defaults, all are 0 except SF indicating 64bit access */ shift = rd = rm = rn = imm = idx = option = amount = scale = 0; sign_ext = 0; sf = 1; matchp = 0; insn = di->di_readword(loc); while (i_ptr->name) { /* If mask is 0 then the parser was not initialized yet */ if ((i_ptr->mask != 0) && ((insn & i_ptr->mask) == i_ptr->pattern)) { matchp = 1; break; } i_ptr++; } if (matchp == 0) goto undefined; /* Global options */ if (i_ptr->special_ops & OP_SF32) sf = 0; /* Global optional tokens */ arm64_disasm_read_token(i_ptr, insn, "SF", &sf); if (i_ptr->special_ops & OP_SF_INV) sf = 1 - sf; if (arm64_disasm_read_token(i_ptr, insn, "SIGN", &sign_ext) == 0) sign_ext = 1 - sign_ext; if (i_ptr->special_ops & OP_SIGN_EXT) sign_ext = 1; if (sign_ext != 0) arm64_disasm_read_token_sign_ext(i_ptr, insn, "IMM", &imm); else arm64_disasm_read_token(i_ptr, insn, "IMM", &imm); if (i_ptr->special_ops & OP_MULT_4) imm <<= 2; /* Print opcode by type */ switch (i_ptr->type) { case TYPE_01: /* OP <RD>, <RN>, <RM>{, <shift [LSL, LSR, ASR]> #<imm>} SF32/64 OP <RD>, <RN>, #<imm>{, <shift [0, 12]>} SF32/64 */ /* Mandatory tokens */ ret = arm64_disasm_read_token(i_ptr, insn, "RD", &rd); ret |= arm64_disasm_read_token(i_ptr, insn, "RN", &rn); if (ret != 0) { printf("ERROR: Missing mandatory token for op %s type %d\n", i_ptr->name, i_ptr->type); goto undefined; } /* Optional tokens */ arm64_disasm_read_token(i_ptr, insn, "SHIFT", &shift); rm_absent = arm64_disasm_read_token(i_ptr, insn, "RM", &rm); di->di_printf("%s\t%s, %s", i_ptr->name, arm64_reg(sf, rd), arm64_reg(sf, rn)); /* If RM is present use it, otherwise use immediate notation */ if (rm_absent == 0) { di->di_printf(", %s", arm64_reg(sf, rm)); if (imm != 0) di->di_printf(", %s #%d", shift_2[shift], imm); } else { if (imm != 0 || shift != 0) di->di_printf(", #0x%x", imm); if (shift != 0) di->di_printf(" LSL #12"); } break; case TYPE_02: /* OP <RT>, [<RN>, #<imm>]{!}] SF32/64 OP <RT>, [<RN>], #<imm>{!} SF32/64 OP <RT>, <RN>, <RM> {, EXTEND AMOUNT } */ /* Mandatory tokens */ ret = arm64_disasm_read_token(i_ptr, insn, "RT", &rt); ret |= arm64_disasm_read_token(i_ptr, insn, "RN", &rn); if (ret != 0) { printf("ERROR: Missing mandatory token for op %s type %d\n", i_ptr->name, i_ptr->type); goto undefined; } /* Optional tokens */ arm64_disasm_read_token(i_ptr, insn, "OPTION", &option); arm64_disasm_read_token(i_ptr, insn, "SCALE", &scale); rm_absent = arm64_disasm_read_token(i_ptr, insn, "RM", &rm); if (rm_absent) { /* * In unsigned operation, shift immediate value * and reset options to default. */ if (sign_ext == 0) { imm = imm << ((insn >> ARM_INSN_SIZE_OFFSET) & ARM_INSN_SIZE_MASK); option = 0; } switch (option) { case 0x0: pre = 0; inside = 1; break; case 0x1: pre = 0; inside = 0; break; case 0x2: default: pre = 1; inside = 1; break; } di->di_printf("%s\t%s, ", i_ptr->name, arm64_reg(sf, rt)); if (inside != 0) { di->di_printf("[%s", arm64_reg(1, rn)); if (imm != 0) di->di_printf(", #%d", imm); di->di_printf("]"); } else { di->di_printf("[%s]", arm64_reg(1, rn)); if (imm != 0) di->di_printf(", #%d", imm); } if (pre != 0) di->di_printf("!"); } else { /* Last bit of option field determines 32/64 bit offset */ di->di_printf("%s\t%s, [%s, %s", i_ptr->name, arm64_reg(sf, rt), arm64_reg(1, rn), arm64_reg(option & 1, rm)); /* Calculate amount, it's op(31:30) */ amount = (insn >> ARM_INSN_SIZE_OFFSET) & ARM_INSN_SIZE_MASK; switch (option) { case 0x2: di->di_printf(", uxtw #%d", amount); break; case 0x3: if (scale != 0) di->di_printf(", lsl #%d", amount); break; case 0x6: di->di_printf(", sxtw #%d", amount); break; case 0x7: di->di_printf(", sxts #%d", amount); break; default: di->di_printf(", RSVD"); break; } di->di_printf("]"); } break; case TYPE_03: /* OP <RT>, #imm SF32/64 */ /* Mandatory tokens */ ret = arm64_disasm_read_token(i_ptr, insn, "RT", &rt); if (ret != 0) { printf("ERROR: Missing mandatory token for op %s type %d\n", i_ptr->name, i_ptr->type); goto undefined; } di->di_printf("%s\t%s, ", i_ptr->name, arm64_reg(sf, rt)); if (i_ptr->special_ops & OP_LITERAL) di->di_printf("0x%lx", loc + imm); else di->di_printf("#%d", imm); break; default: goto undefined; } di->di_printf("\n"); return(loc + INSN_SIZE); undefined: di->di_printf("undefined\t%08x\n", insn); return(loc + INSN_SIZE); } /* Parse format strings at the very beginning */ SYSINIT(arm64_disasm_generate_masks, SI_SUB_DDB_SERVICES, SI_ORDER_FIRST, arm64_disasm_generate_masks, arm64_i);
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