181 lines
6.3 KiB
C
181 lines
6.3 KiB
C
/* DWARF2 EH unwinding support for DragonFly BSD: AMD x86-64 and x86.
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Copyright (C) 2014-2016 Free Software Foundation, Inc.
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Contributed by John Marino <gnugcc@marino.st>
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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 <sys/types.h>
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#include <sys/sysctl.h>
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#include <signal.h>
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#include <sys/ucontext.h>
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#include <machine/sigframe.h>
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#define REG_NAME(reg) sf_uc.uc_mcontext.mc_## reg
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#ifdef __x86_64__
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#define MD_FALLBACK_FRAME_STATE_FOR x86_64_dragonfly_fallback_frame_state
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static void
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x86_64_sigtramp_range (unsigned char **start, unsigned char **end)
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{
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unsigned long ps_strings;
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int mib[2];
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size_t len;
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mib[0] = CTL_KERN;
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mib[1] = KERN_PS_STRINGS;
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len = sizeof (ps_strings);
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sysctl (mib, 2, &ps_strings, &len, NULL, 0);
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*start = (unsigned char *)ps_strings - 32;
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*end = (unsigned char *)ps_strings;
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}
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static _Unwind_Reason_Code
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x86_64_dragonfly_fallback_frame_state
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(struct _Unwind_Context *context, _Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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unsigned char *sigtramp_start, *sigtramp_end;
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struct sigframe *sf;
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long new_cfa;
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x86_64_sigtramp_range(&sigtramp_start, &sigtramp_end);
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if (pc >= sigtramp_end || pc < sigtramp_start)
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return _URC_END_OF_STACK;
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sf = (struct sigframe *) context->cfa;
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new_cfa = sf->REG_NAME(rsp);
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fs->regs.cfa_how = CFA_REG_OFFSET;
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/* Register 7 is rsp */
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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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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 /* Next section is for i386 */
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#define MD_FALLBACK_FRAME_STATE_FOR x86_dragonfly_fallback_frame_state
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static void
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x86_sigtramp_range (unsigned char **start, unsigned char **end)
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{
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unsigned long ps_strings;
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int mib[2];
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size_t len;
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mib[0] = CTL_KERN;
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mib[1] = KERN_PS_STRINGS;
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len = sizeof (ps_strings);
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sysctl (mib, 2, &ps_strings, &len, NULL, 0);
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*start = (unsigned char *)ps_strings - 128;
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*end = (unsigned char *)ps_strings;
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}
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static _Unwind_Reason_Code
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x86_dragonfly_fallback_frame_state
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(struct _Unwind_Context *context, _Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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unsigned char *sigtramp_start, *sigtramp_end;
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struct sigframe *sf;
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long new_cfa;
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x86_sigtramp_range(&sigtramp_start, &sigtramp_end);
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if (pc >= sigtramp_end || pc < sigtramp_start)
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return _URC_END_OF_STACK;
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sf = (struct sigframe *) context->cfa;
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new_cfa = sf->REG_NAME(esp);
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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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(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)&sf->REG_NAME(eip) - new_cfa;
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fs->retaddr_column = 8;
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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 /* ifdef __x86_64__ */
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