forked from KolibriOS/kolibrios
245 lines
8.8 KiB
C
245 lines
8.8 KiB
C
/* DWARF2 EH unwinding support for AMD x86-64 and x86.
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Copyright (C) 2009-2015 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2.c for the structs. */
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#include <ucontext.h>
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#include <sys/frame.h>
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#ifdef __x86_64__
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#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state
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static _Unwind_Reason_Code
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x86_64_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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mcontext_t *mctx;
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long new_cfa;
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if (/* Solaris 10+
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------------
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<__sighndlr+0>: push %rbp
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<__sighndlr+1>: mov %rsp,%rbp
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<__sighndlr+4>: callq *%rcx
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<__sighndlr+6>: leaveq <--- PC
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<__sighndlr+7>: retq */
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*(unsigned long *)(pc - 6) == 0xc3c9d1ffe5894855)
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/* We need to move up three frames:
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<signal handler> <-- context->cfa
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__sighndlr
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call_user_handler
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sigacthandler
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<kernel>
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context->cfa points into the frame after the saved frame pointer and
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saved pc (struct frame).
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The ucontext_t structure is in the kernel frame after the signal
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number and a siginfo_t *. Since the frame sizes vary even within
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Solaris 10 updates, we need to walk the stack to get there. */
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{
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struct frame *fp = (struct frame *) context->cfa - 1;
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struct handler_args {
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int signo;
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siginfo_t *sip;
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ucontext_t ucontext;
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} *handler_args;
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ucontext_t *ucp;
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/* Next frame: __sighndlr frame pointer. */
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fp = (struct frame *) fp->fr_savfp;
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/* call_user_handler frame pointer. */
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fp = (struct frame *) fp->fr_savfp;
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/* sigacthandler frame pointer. */
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fp = (struct frame *) fp->fr_savfp;
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/* The argument area precedes the struct frame. */
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handler_args = (struct handler_args *) (fp + 1);
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ucp = &handler_args->ucontext;
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mctx = &ucp->uc_mcontext;
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}
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else
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return _URC_END_OF_STACK;
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new_cfa = mctx->gregs[REG_RSP];
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = 7;
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fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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/* The SVR4 register numbering macros aren't usable in libgcc. */
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fs->regs.reg[0].how = REG_SAVED_OFFSET;
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fs->regs.reg[0].loc.offset = (long)&mctx->gregs[REG_RAX] - new_cfa;
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fs->regs.reg[1].how = REG_SAVED_OFFSET;
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fs->regs.reg[1].loc.offset = (long)&mctx->gregs[REG_RDX] - new_cfa;
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fs->regs.reg[2].how = REG_SAVED_OFFSET;
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fs->regs.reg[2].loc.offset = (long)&mctx->gregs[REG_RCX] - new_cfa;
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fs->regs.reg[3].how = REG_SAVED_OFFSET;
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fs->regs.reg[3].loc.offset = (long)&mctx->gregs[REG_RBX] - new_cfa;
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fs->regs.reg[4].how = REG_SAVED_OFFSET;
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fs->regs.reg[4].loc.offset = (long)&mctx->gregs[REG_RSI] - new_cfa;
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fs->regs.reg[5].how = REG_SAVED_OFFSET;
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fs->regs.reg[5].loc.offset = (long)&mctx->gregs[REG_RDI] - new_cfa;
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fs->regs.reg[6].how = REG_SAVED_OFFSET;
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fs->regs.reg[6].loc.offset = (long)&mctx->gregs[REG_RBP] - new_cfa;
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fs->regs.reg[8].how = REG_SAVED_OFFSET;
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fs->regs.reg[8].loc.offset = (long)&mctx->gregs[REG_R8] - new_cfa;
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fs->regs.reg[9].how = REG_SAVED_OFFSET;
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fs->regs.reg[9].loc.offset = (long)&mctx->gregs[REG_R9] - new_cfa;
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fs->regs.reg[10].how = REG_SAVED_OFFSET;
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fs->regs.reg[10].loc.offset = (long)&mctx->gregs[REG_R10] - new_cfa;
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fs->regs.reg[11].how = REG_SAVED_OFFSET;
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fs->regs.reg[11].loc.offset = (long)&mctx->gregs[REG_R11] - new_cfa;
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fs->regs.reg[12].how = REG_SAVED_OFFSET;
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fs->regs.reg[12].loc.offset = (long)&mctx->gregs[REG_R12] - new_cfa;
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fs->regs.reg[13].how = REG_SAVED_OFFSET;
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fs->regs.reg[13].loc.offset = (long)&mctx->gregs[REG_R13] - new_cfa;
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fs->regs.reg[14].how = REG_SAVED_OFFSET;
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fs->regs.reg[14].loc.offset = (long)&mctx->gregs[REG_R14] - new_cfa;
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fs->regs.reg[15].how = REG_SAVED_OFFSET;
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fs->regs.reg[15].loc.offset = (long)&mctx->gregs[REG_R15] - new_cfa;
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fs->regs.reg[16].how = REG_SAVED_OFFSET;
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fs->regs.reg[16].loc.offset = (long)&mctx->gregs[REG_RIP] - new_cfa;
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fs->retaddr_column = 16;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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#else
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#define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state
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static _Unwind_Reason_Code
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x86_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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mcontext_t *mctx;
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long new_cfa;
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if (/* Solaris 10
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-----------
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<__sighndlr+0>: push %ebp
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<__sighndlr+1>: mov %esp,%ebp
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<__sighndlr+3>: pushl 0x10(%ebp)
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<__sighndlr+6>: pushl 0xc(%ebp)
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<__sighndlr+9>: pushl 0x8(%ebp)
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<__sighndlr+12>: call *0x14(%ebp)
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<__sighndlr+15>: add $0xc,%esp <--- PC
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<__sighndlr+18>: leave
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<__sighndlr+19>: ret */
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(*(unsigned long *)(pc - 15) == 0xffec8b55
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&& *(unsigned long *)(pc - 11) == 0x75ff1075
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&& *(unsigned long *)(pc - 7) == 0x0875ff0c
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&& *(unsigned long *)(pc - 3) == 0x831455ff
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&& *(unsigned long *)(pc + 1) == 0xc3c90cc4)
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|| /* Solaris 11 before snv_125
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--------------------------
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<__sighndlr+0> push %ebp
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<__sighndlr+1> mov %esp,%ebp
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<__sighndlr+4> pushl 0x10(%ebp)
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<__sighndlr+6> pushl 0xc(%ebp)
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<__sighndlr+9> pushl 0x8(%ebp)
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<__sighndlr+12> call *0x14(%ebp)
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<__sighndlr+15> add $0xc,%esp
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<__sighndlr+18> leave <--- PC
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<__sighndlr+19> ret */
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(*(unsigned long *)(pc - 18) == 0xffec8b55
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&& *(unsigned long *)(pc - 14) == 0x7fff107f
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&& *(unsigned long *)(pc - 10) == 0x0875ff0c
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&& *(unsigned long *)(pc - 6) == 0x83145fff
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&& *(unsigned long *)(pc - 1) == 0xc3c90cc4)
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|| /* Solaris 11 since snv_125
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-------------------------
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<__sighndlr+0> push %ebp
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<__sighndlr+1> mov %esp,%ebp
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<__sighndlr+3> and $0xfffffff0,%esp
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<__sighndlr+6> sub $0x4,%esp
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<__sighndlr+9> pushl 0x10(%ebp)
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<__sighndlr+12> pushl 0xc(%ebp)
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<__sighndlr+15> pushl 0x8(%ebp)
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<__sighndlr+18> call *0x14(%ebp)
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<__sighndlr+21> leave <--- PC
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<__sighndlr+22> ret */
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(*(unsigned long *)(pc - 21) == 0x83ec8b55
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&& *(unsigned long *)(pc - 17) == 0xec83f0e4
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&& *(unsigned long *)(pc - 13) == 0x1075ff04
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&& *(unsigned long *)(pc - 9) == 0xff0c75ff
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&& *(unsigned long *)(pc - 5) == 0x55ff0875
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&& (*(unsigned long *)(pc - 1) & 0x00ffffff) == 0x00c3c914))
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{
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struct handler_args {
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int signo;
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siginfo_t *sip;
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ucontext_t *ucontext;
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} *handler_args = context->cfa;
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mctx = &handler_args->ucontext->uc_mcontext;
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}
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else
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return _URC_END_OF_STACK;
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new_cfa = mctx->gregs[UESP];
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = 4;
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fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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/* The SVR4 register numbering macros aren't usable in libgcc. */
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fs->regs.reg[0].how = REG_SAVED_OFFSET;
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fs->regs.reg[0].loc.offset = (long)&mctx->gregs[EAX] - new_cfa;
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fs->regs.reg[3].how = REG_SAVED_OFFSET;
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fs->regs.reg[3].loc.offset = (long)&mctx->gregs[EBX] - new_cfa;
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fs->regs.reg[1].how = REG_SAVED_OFFSET;
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fs->regs.reg[1].loc.offset = (long)&mctx->gregs[ECX] - new_cfa;
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fs->regs.reg[2].how = REG_SAVED_OFFSET;
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fs->regs.reg[2].loc.offset = (long)&mctx->gregs[EDX] - new_cfa;
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fs->regs.reg[6].how = REG_SAVED_OFFSET;
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fs->regs.reg[6].loc.offset = (long)&mctx->gregs[ESI] - new_cfa;
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fs->regs.reg[7].how = REG_SAVED_OFFSET;
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fs->regs.reg[7].loc.offset = (long)&mctx->gregs[EDI] - new_cfa;
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fs->regs.reg[5].how = REG_SAVED_OFFSET;
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fs->regs.reg[5].loc.offset = (long)&mctx->gregs[EBP] - new_cfa;
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fs->regs.reg[8].how = REG_SAVED_OFFSET;
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fs->regs.reg[8].loc.offset = (long)&mctx->gregs[EIP] - new_cfa;
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fs->retaddr_column = 8;
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/* SIGFPE for IEEE-754 exceptions is delivered after the faulting insn
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rather than before it, so don't set fs->signal_frame in that case.
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We test whether the ES field of the Status Register is zero. */
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if ((mctx->fpregs.fp_reg_set.fpchip_state.status & 0x80) == 0)
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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#endif
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