| /* DWARF2 EH unwinding support for AMD x86-64 and x86. |
| Copyright (C) 2004, 2005 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 2, or (at your option) |
| any later version. |
| |
| In addition to the permissions in the GNU General Public License, the |
| Free Software Foundation gives you unlimited permission to link the |
| compiled version of this file with other programs, and to distribute |
| those programs without any restriction coming from the use of this |
| file. (The General Public License restrictions do apply in other |
| respects; for example, they cover modification of the file, and |
| distribution when not linked into another program.) |
| |
| 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* 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; |
| sc = (struct sigcontext *) &uc_->uc_mcontext; |
| } |
| else |
| return _URC_END_OF_STACK; |
| |
| new_cfa = sc->rsp; |
| fs->cfa_how = CFA_REG_OFFSET; |
| /* Register 7 is rsp */ |
| fs->cfa_reg = 7; |
| fs->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; |
| 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; |
| sc = (struct sigcontext *) &rt_->uc.uc_mcontext; |
| } |
| else |
| return _URC_END_OF_STACK; |
| |
| new_cfa = sc->REG_NAME(esp); |
| fs->cfa_how = CFA_REG_OFFSET; |
| fs->cfa_reg = 4; |
| fs->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; |
| return _URC_NO_REASON; |
| } |
| #endif /* not glibc 2.0 */ |
| #endif /* ifdef __x86_64__ */ |
| #endif /* ifdef inhibit_libc */ |