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/* DWARF2 EH unwinding support for AMD x86-64 and x86. Copyright (C) 2009, 2010 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. */ #include <ucontext.h> #include <sys/frame.h> #ifdef __x86_64__ #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; mcontext_t *mctx; long new_cfa; if (/* Solaris 10+ ------------ <__sighndlr+0>: push %rbp <__sighndlr+1>: mov %rsp,%rbp <__sighndlr+4>: callq *%rcx <__sighndlr+6>: leaveq <--- PC <__sighndlr+7>: retq */ *(unsigned long *)(pc - 6) == 0xc3c9d1ffe5894855) /* We need to move up three frames: <signal handler> <-- context->cfa __sighndlr call_user_handler sigacthandler <kernel> context->cfa points into the frame after the saved frame pointer and saved pc (struct frame). The ucontext_t structure is in the kernel frame after the signal number and a siginfo_t *. Since the frame sizes vary even within Solaris 10 updates, we need to walk the stack to get there. */ { struct frame *fp = (struct frame *) context->cfa - 1; struct handler_args { int signo; siginfo_t *sip; ucontext_t ucontext; } *handler_args; ucontext_t *ucp; /* Next frame: __sighndlr frame pointer. */ fp = (struct frame *) fp->fr_savfp; /* call_user_handler frame pointer. */ fp = (struct frame *) fp->fr_savfp; /* sigacthandler frame pointer. */ fp = (struct frame *) fp->fr_savfp; /* The argument area precedes the struct frame. */ handler_args = (struct handler_args *) (fp + 1); ucp = &handler_args->ucontext; mctx = &ucp->uc_mcontext; } else return _URC_END_OF_STACK; new_cfa = mctx->gregs[REG_RSP]; fs->regs.cfa_how = CFA_REG_OFFSET; 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)&mctx->gregs[REG_RAX] - new_cfa; fs->regs.reg[1].how = REG_SAVED_OFFSET; fs->regs.reg[1].loc.offset = (long)&mctx->gregs[REG_RDX] - new_cfa; fs->regs.reg[2].how = REG_SAVED_OFFSET; fs->regs.reg[2].loc.offset = (long)&mctx->gregs[REG_RCX] - new_cfa; fs->regs.reg[3].how = REG_SAVED_OFFSET; fs->regs.reg[3].loc.offset = (long)&mctx->gregs[REG_RBX] - new_cfa; fs->regs.reg[4].how = REG_SAVED_OFFSET; fs->regs.reg[4].loc.offset = (long)&mctx->gregs[REG_RSI] - new_cfa; fs->regs.reg[5].how = REG_SAVED_OFFSET; fs->regs.reg[5].loc.offset = (long)&mctx->gregs[REG_RDI] - new_cfa; fs->regs.reg[6].how = REG_SAVED_OFFSET; fs->regs.reg[6].loc.offset = (long)&mctx->gregs[REG_RBP] - new_cfa; fs->regs.reg[8].how = REG_SAVED_OFFSET; fs->regs.reg[8].loc.offset = (long)&mctx->gregs[REG_R8] - new_cfa; fs->regs.reg[9].how = REG_SAVED_OFFSET; fs->regs.reg[9].loc.offset = (long)&mctx->gregs[REG_R9] - new_cfa; fs->regs.reg[10].how = REG_SAVED_OFFSET; fs->regs.reg[10].loc.offset = (long)&mctx->gregs[REG_R10] - new_cfa; fs->regs.reg[11].how = REG_SAVED_OFFSET; fs->regs.reg[11].loc.offset = (long)&mctx->gregs[REG_R11] - new_cfa; fs->regs.reg[12].how = REG_SAVED_OFFSET; fs->regs.reg[12].loc.offset = (long)&mctx->gregs[REG_R12] - new_cfa; fs->regs.reg[13].how = REG_SAVED_OFFSET; fs->regs.reg[13].loc.offset = (long)&mctx->gregs[REG_R13] - new_cfa; fs->regs.reg[14].how = REG_SAVED_OFFSET; fs->regs.reg[14].loc.offset = (long)&mctx->gregs[REG_R14] - new_cfa; fs->regs.reg[15].how = REG_SAVED_OFFSET; fs->regs.reg[15].loc.offset = (long)&mctx->gregs[REG_R15] - new_cfa; fs->regs.reg[16].how = REG_SAVED_OFFSET; fs->regs.reg[16].loc.offset = (long)&mctx->gregs[REG_RIP] - new_cfa; fs->retaddr_column = 16; fs->signal_frame = 1; return _URC_NO_REASON; } #else #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; mcontext_t *mctx; long new_cfa; if (/* Solaris 8 - single-threaded ---------------------------- <sigacthandler+17>: mov 0x10(%ebp),%esi <sigacthandler+20>: push %esi <sigacthandler+21>: pushl 0xc(%ebp) <sigacthandler+24>: mov 0x8(%ebp),%ecx <sigacthandler+27>: push %ecx <sigacthandler+28>: mov offset(%ebx),%eax <sigacthandler+34>: call *(%eax,%ecx,4) <sigacthandler+37>: add $0xc,%esp <--- PC <sigacthandler+40>: push %esi ... */ (*(unsigned long *)(pc - 20) == 0x5610758b && *(unsigned long *)(pc - 16) == 0x8b0c75ff && *(unsigned long *)(pc - 12) == 0x8b51084d && *(unsigned char *)(pc - 8) == 0x83 && *(unsigned long *)(pc - 4) == 0x8814ff00 && *(unsigned long *)(pc - 0) == 0x560cc483) || /* Solaris 8 - multi-threaded --------------------------- <__sighndlr+0>: push %ebp <__sighndlr+1>: mov %esp,%ebp <__sighndlr+3>: pushl 0x10(%ebp) <__sighndlr+6>: pushl 0xc(%ebp) <__sighndlr+9>: pushl 0x8(%ebp) <__sighndlr+12>: call *0x14(%ebp) <__sighndlr+15>: leave <--- PC */ (*(unsigned long *)(pc - 15) == 0xffec8b55 && *(unsigned long *)(pc - 11) == 0x75ff1075 && *(unsigned long *)(pc - 7) == 0x0875ff0c && *(unsigned long *)(pc - 3) == 0xc91455ff) || /* Solaris 9 - single-threaded ---------------------------- <sigacthandler+16>: mov 0x244(%ebx),%ecx <sigacthandler+22>: mov 0x8(%ebp),%eax <sigacthandler+25>: mov (%ecx,%eax,4),%ecx <sigacthandler+28>: pushl 0x10(%ebp) <sigacthandler+31>: pushl 0xc(%ebp) <sigacthandler+34>: push %eax <sigacthandler+35>: call *%ecx <sigacthandler+37>: add $0xc,%esp <--- PC <sigacthandler+40>: pushl 0x10(%ebp) */ (*(unsigned long *)(pc - 21) == 0x2448b8b && *(unsigned long *)(pc - 17) == 0x458b0000 && *(unsigned long *)(pc - 13) == 0x810c8b08 && *(unsigned long *)(pc - 9) == 0xff1075ff && *(unsigned long *)(pc - 5) == 0xff500c75 && *(unsigned long *)(pc - 1) == 0xcc483d1) || /* Solaris 9 - multi-threaded, Solaris 10 --------------------------------------- <__sighndlr+0>: push %ebp <__sighndlr+1>: mov %esp,%ebp <__sighndlr+3>: pushl 0x10(%ebp) <__sighndlr+6>: pushl 0xc(%ebp) <__sighndlr+9>: pushl 0x8(%ebp) <__sighndlr+12>: call *0x14(%ebp) <__sighndlr+15>: add $0xc,%esp <--- PC <__sighndlr+18>: leave <__sighndlr+19>: ret */ (*(unsigned long *)(pc - 15) == 0xffec8b55 && *(unsigned long *)(pc - 11) == 0x75ff1075 && *(unsigned long *)(pc - 7) == 0x0875ff0c && *(unsigned long *)(pc - 3) == 0x831455ff && *(unsigned long *)(pc + 1) == 0xc3c90cc4) || /* Solaris 11 before snv_125 -------------------------- <__sighndlr+0> push %ebp <__sighndlr+1> mov %esp,%ebp <__sighndlr+4> pushl 0x10(%ebp) <__sighndlr+6> pushl 0xc(%ebp) <__sighndlr+9> pushl 0x8(%ebp) <__sighndlr+12> call *0x14(%ebp) <__sighndlr+15> add $0xc,%esp <__sighndlr+18> leave <--- PC <__sighndlr+19> ret */ (*(unsigned long *)(pc - 18) == 0xffec8b55 && *(unsigned long *)(pc - 14) == 0x7fff107f && *(unsigned long *)(pc - 10) == 0x0875ff0c && *(unsigned long *)(pc - 6) == 0x83145fff && *(unsigned long *)(pc - 1) == 0xc3c90cc4) || /* Solaris 11 since snv_125 ------------------------- <__sighndlr+0> push %ebp <__sighndlr+1> mov %esp,%ebp <__sighndlr+3> and $0xfffffff0,%esp <__sighndlr+6> sub $0x4,%esp <__sighndlr+9> pushl 0x10(%ebp) <__sighndlr+12> pushl 0xc(%ebp) <__sighndlr+15> pushl 0x8(%ebp) <__sighndlr+18> call *0x14(%ebp) <__sighndlr+21> leave <--- PC <__sighndlr+22> ret */ (*(unsigned long *)(pc - 21) == 0x83ec8b55 && *(unsigned long *)(pc - 17) == 0xec83f0e4 && *(unsigned long *)(pc - 13) == 0x1075ff04 && *(unsigned long *)(pc - 9) == 0xff0c75ff && *(unsigned long *)(pc - 5) == 0x55ff0875 && (*(unsigned long *)(pc - 1) & 0x00ffffff) == 0x00c3c914)) { struct handler_args { int signo; siginfo_t *sip; ucontext_t *ucontext; } *handler_args = context->cfa; mctx = &handler_args->ucontext->uc_mcontext; } else return _URC_END_OF_STACK; new_cfa = mctx->gregs[UESP]; 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)&mctx->gregs[EAX] - new_cfa; fs->regs.reg[3].how = REG_SAVED_OFFSET; fs->regs.reg[3].loc.offset = (long)&mctx->gregs[EBX] - new_cfa; fs->regs.reg[1].how = REG_SAVED_OFFSET; fs->regs.reg[1].loc.offset = (long)&mctx->gregs[ECX] - new_cfa; fs->regs.reg[2].how = REG_SAVED_OFFSET; fs->regs.reg[2].loc.offset = (long)&mctx->gregs[EDX] - new_cfa; fs->regs.reg[6].how = REG_SAVED_OFFSET; fs->regs.reg[6].loc.offset = (long)&mctx->gregs[ESI] - new_cfa; fs->regs.reg[7].how = REG_SAVED_OFFSET; fs->regs.reg[7].loc.offset = (long)&mctx->gregs[EDI] - new_cfa; fs->regs.reg[5].how = REG_SAVED_OFFSET; fs->regs.reg[5].loc.offset = (long)&mctx->gregs[EBP] - new_cfa; fs->regs.reg[8].how = REG_SAVED_OFFSET; fs->regs.reg[8].loc.offset = (long)&mctx->gregs[EIP] - new_cfa; fs->retaddr_column = 8; fs->signal_frame = 1; return _URC_NO_REASON; } #endif
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