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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [i386/] [linux-unwind.h] - Rev 316
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/* DWARF2 EH unwinding support for AMD x86-64 and x86. Copyright (C) 2004, 2005, 2006, 2009 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* Do code reading to identify a signal frame, and set the frame state data appropriately. See unwind-dw2.c for the structs. Don't use this at all if inhibit_libc is used. */ #ifndef inhibit_libc #ifdef __x86_64__ #include <signal.h> #include <sys/ucontext.h> #define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state static _Unwind_Reason_Code x86_64_fallback_frame_state (struct _Unwind_Context *context, _Unwind_FrameState *fs) { unsigned char *pc = context->ra; struct sigcontext *sc; long new_cfa; /* movq __NR_rt_sigreturn, %rax ; syscall */ if (*(unsigned char *)(pc+0) == 0x48 && *(unsigned long *)(pc+1) == 0x050f0000000fc0c7) { struct ucontext *uc_ = context->cfa; /* The void * cast is necessary to avoid an aliasing warning. The aliasing warning is correct, but should not be a problem because it does not alias anything. */ sc = (struct sigcontext *) (void *) &uc_->uc_mcontext; } else return _URC_END_OF_STACK; new_cfa = sc->rsp; fs->regs.cfa_how = CFA_REG_OFFSET; /* Register 7 is rsp */ fs->regs.cfa_reg = 7; fs->regs.cfa_offset = new_cfa - (long) context->cfa; /* The SVR4 register numbering macros aren't usable in libgcc. */ fs->regs.reg[0].how = REG_SAVED_OFFSET; fs->regs.reg[0].loc.offset = (long)&sc->rax - new_cfa; fs->regs.reg[1].how = REG_SAVED_OFFSET; fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa; fs->regs.reg[2].how = REG_SAVED_OFFSET; fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa; fs->regs.reg[3].how = REG_SAVED_OFFSET; fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa; fs->regs.reg[4].how = REG_SAVED_OFFSET; fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa; fs->regs.reg[5].how = REG_SAVED_OFFSET; fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa; fs->regs.reg[6].how = REG_SAVED_OFFSET; fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa; fs->regs.reg[8].how = REG_SAVED_OFFSET; fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa; fs->regs.reg[9].how = REG_SAVED_OFFSET; fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa; fs->regs.reg[10].how = REG_SAVED_OFFSET; fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa; fs->regs.reg[11].how = REG_SAVED_OFFSET; fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa; fs->regs.reg[12].how = REG_SAVED_OFFSET; fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa; fs->regs.reg[13].how = REG_SAVED_OFFSET; fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa; fs->regs.reg[14].how = REG_SAVED_OFFSET; fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa; fs->regs.reg[15].how = REG_SAVED_OFFSET; fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa; fs->regs.reg[16].how = REG_SAVED_OFFSET; fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa; fs->retaddr_column = 16; fs->signal_frame = 1; return _URC_NO_REASON; } #else /* ifdef __x86_64__ */ /* There's no sys/ucontext.h for glibc 2.0, so no signal-turned-exceptions for them. There's also no configure-run for the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the target libc version macro should be enough. */ #if !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0) #include <signal.h> #include <sys/ucontext.h> #define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state static _Unwind_Reason_Code x86_fallback_frame_state (struct _Unwind_Context *context, _Unwind_FrameState *fs) { unsigned char *pc = context->ra; struct sigcontext *sc; long new_cfa; /* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ if (*(unsigned short *)(pc+0) == 0xb858 && *(unsigned int *)(pc+2) == 119 && *(unsigned short *)(pc+6) == 0x80cd) sc = context->cfa + 4; /* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ else if (*(unsigned char *)(pc+0) == 0xb8 && *(unsigned int *)(pc+1) == 173 && *(unsigned short *)(pc+5) == 0x80cd) { struct rt_sigframe { int sig; struct siginfo *pinfo; void *puc; struct siginfo info; struct ucontext uc; } *rt_ = context->cfa; /* The void * cast is necessary to avoid an aliasing warning. The aliasing warning is correct, but should not be a problem because it does not alias anything. */ sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext; } else return _URC_END_OF_STACK; new_cfa = sc->REG_NAME(esp); fs->regs.cfa_how = CFA_REG_OFFSET; fs->regs.cfa_reg = 4; fs->regs.cfa_offset = new_cfa - (long) context->cfa; /* The SVR4 register numbering macros aren't usable in libgcc. */ fs->regs.reg[0].how = REG_SAVED_OFFSET; fs->regs.reg[0].loc.offset = (long)&sc->REG_NAME(eax) - new_cfa; fs->regs.reg[3].how = REG_SAVED_OFFSET; fs->regs.reg[3].loc.offset = (long)&sc->REG_NAME(ebx) - new_cfa; fs->regs.reg[1].how = REG_SAVED_OFFSET; fs->regs.reg[1].loc.offset = (long)&sc->REG_NAME(ecx) - new_cfa; fs->regs.reg[2].how = REG_SAVED_OFFSET; fs->regs.reg[2].loc.offset = (long)&sc->REG_NAME(edx) - new_cfa; fs->regs.reg[6].how = REG_SAVED_OFFSET; fs->regs.reg[6].loc.offset = (long)&sc->REG_NAME(esi) - new_cfa; fs->regs.reg[7].how = REG_SAVED_OFFSET; fs->regs.reg[7].loc.offset = (long)&sc->REG_NAME(edi) - new_cfa; fs->regs.reg[5].how = REG_SAVED_OFFSET; fs->regs.reg[5].loc.offset = (long)&sc->REG_NAME(ebp) - new_cfa; fs->regs.reg[8].how = REG_SAVED_OFFSET; fs->regs.reg[8].loc.offset = (long)&sc->REG_NAME(eip) - new_cfa; fs->retaddr_column = 8; fs->signal_frame = 1; return _URC_NO_REASON; } #define MD_FROB_UPDATE_CONTEXT x86_frob_update_context /* Fix up for kernels that have vDSO, but don't have S flag in it. */ static void x86_frob_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs ATTRIBUTE_UNUSED) { unsigned char *pc = context->ra; /* movl $__NR_rt_sigreturn,%eax ; {int $0x80 | syscall} */ if (*(unsigned char *)(pc+0) == 0xb8 && *(unsigned int *)(pc+1) == 173 && (*(unsigned short *)(pc+5) == 0x80cd || *(unsigned short *)(pc+5) == 0x050f)) _Unwind_SetSignalFrame (context, 1); } #endif /* not glibc 2.0 */ #endif /* ifdef __x86_64__ */ #endif /* ifdef inhibit_libc */
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