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ia32_exception.S
(2.6 KB)
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ia32_misc.c
(2.59 KB)
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ia32_reg.c
(7.03 KB)
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ia32_signal.c
(27.64 KB)
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ia32_sigtramp.S
(3.52 KB)
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ia32_syscall.c
(7.18 KB)
Editing: ia32_sigtramp.S
/*- * Copyright (c) 2003 Peter Wemm * All rights reserved. * * 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. * * $FreeBSD$ */ #include <machine/asmacros.h> #include <sys/syscall.h> #include "ia32_assym.h" .text .code32 /* * Signal trampoline, copied to top of user stack * XXX may need to be MD to match backend sendsig handoff protocol */ ALIGN_TEXT .globl ia32_sigcode ia32_sigcode: calll *IA32_SIGF_HANDLER(%esp) leal IA32_SIGF_UC(%esp),%eax /* get ucontext */ pushl %eax movl $SYS_sigreturn,%eax pushl %eax /* junk to fake return addr. */ int $0x80 /* enter kernel with args */ /* on stack */ 1: jmp 1b #ifdef COMPAT_FREEBSD4 ALIGN_TEXT freebsd4_ia32_sigcode: calll *IA32_SIGF_HANDLER(%esp) leal IA32_SIGF_UC4(%esp),%eax/* get ucontext */ pushl %eax movl $344,%eax /* 4.x SYS_sigreturn */ pushl %eax /* junk to fake return addr. */ int $0x80 /* enter kernel with args */ /* on stack */ 1: jmp 1b #endif #ifdef COMPAT_43 ALIGN_TEXT ia32_osigcode: calll *IA32_SIGF_HANDLER(%esp)/* call signal handler */ leal IA32_SIGF_SC(%esp),%eax /* get sigcontext */ pushl %eax movl $103,%eax /* 3.x SYS_sigreturn */ pushl %eax /* junk to fake return addr. */ int $0x80 /* enter kernel with args */ 1: jmp 1b /* * Our lcall $7,$0 handler remains in user mode (ring 3), since lcalls * don't change the interrupt mask, so if this one went directly to the * kernel then there would be a window with interrupts enabled in kernel * mode, and all interrupt handlers would have to be almost as complicated * as the NMI handler to support this. * * Instead, convert the lcall to an int0x80 call. The kernel does most * of the conversion by popping the lcall return values off the user * stack and returning to them instead of to here, except when the * conversion itself fails. Adjusting the stack here is impossible for * vfork() and harder for other syscalls. */ ALIGN_TEXT lcall_tramp: int $0x80 1: jmp 1b #endif ALIGN_TEXT esigcode: .data .globl sz_ia32_sigcode sz_ia32_sigcode: .long esigcode-ia32_sigcode #ifdef COMPAT_FREEBSD4 .globl sz_freebsd4_ia32_sigcode sz_freebsd4_ia32_sigcode: .long esigcode-freebsd4_ia32_sigcode #endif #ifdef COMPAT_43 .globl sz_ia32_osigcode sz_ia32_osigcode: .long esigcode-ia32_osigcode .globl sz_lcall_tramp sz_lcall_tramp: .long esigcode-lcall_tramp #endif
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