0,0 → 1,173 |
/* DWARF2 EH unwinding support for FreeBSD: AMD x86-64 and x86. |
Copyright (C) 2015 Free Software Foundation, Inc. |
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 |
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. |
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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. |
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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. |
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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/>. */ |
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/* Do code reading to identify a signal frame, and set the frame |
state data appropriately. See unwind-dw2.c for the structs. */ |
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#include <sys/types.h> |
#include <signal.h> |
#include <sys/ucontext.h> |
#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__ |
#define MD_FALLBACK_FRAME_STATE_FOR x86_64_freebsd_fallback_frame_state |
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static _Unwind_Reason_Code |
x86_64_freebsd_fallback_frame_state |
(struct _Unwind_Context *context, _Unwind_FrameState *fs) |
{ |
struct sigframe *sf; |
long new_cfa; |
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/* Prior to FreeBSD 9, the signal trampoline was located immediately |
before the ps_strings. To support non-executable stacks on AMD64, |
the sigtramp was moved to a shared page for FreeBSD 9. Unfortunately |
this means looking frame patterns again (sys/amd64/amd64/sigtramp.S) |
rather than using the robust and convenient KERN_PS_STRINGS trick. |
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<pc + 00>: lea 0x10(%rsp),%rdi |
<pc + 05>: pushq $0x0 |
<pc + 17>: mov $0x1a1,%rax |
<pc + 14>: syscall |
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If we can't find this pattern, we're at the end of the stack. |
*/ |
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if (!( *(unsigned int *)(context->ra) == 0x247c8d48 |
&& *(unsigned int *)(context->ra + 4) == 0x48006a10 |
&& *(unsigned int *)(context->ra + 8) == 0x01a1c0c7 |
&& *(unsigned int *)(context->ra + 12) == 0x050f0000 )) |
return _URC_END_OF_STACK; |
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sf = (struct sigframe *) context->cfa; |
new_cfa = sf->REG_NAME(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; |
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/* 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)&sf->REG_NAME(rax) - new_cfa; |
fs->regs.reg[1].how = REG_SAVED_OFFSET; |
fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(rdx) - new_cfa; |
fs->regs.reg[2].how = REG_SAVED_OFFSET; |
fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(rcx) - new_cfa; |
fs->regs.reg[3].how = REG_SAVED_OFFSET; |
fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(rbx) - new_cfa; |
fs->regs.reg[4].how = REG_SAVED_OFFSET; |
fs->regs.reg[4].loc.offset = (long)&sf->REG_NAME(rsi) - new_cfa; |
fs->regs.reg[5].how = REG_SAVED_OFFSET; |
fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(rdi) - new_cfa; |
fs->regs.reg[6].how = REG_SAVED_OFFSET; |
fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(rbp) - new_cfa; |
fs->regs.reg[8].how = REG_SAVED_OFFSET; |
fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(r8) - new_cfa; |
fs->regs.reg[9].how = REG_SAVED_OFFSET; |
fs->regs.reg[9].loc.offset = (long)&sf->REG_NAME(r9) - new_cfa; |
fs->regs.reg[10].how = REG_SAVED_OFFSET; |
fs->regs.reg[10].loc.offset = (long)&sf->REG_NAME(r10) - new_cfa; |
fs->regs.reg[11].how = REG_SAVED_OFFSET; |
fs->regs.reg[11].loc.offset = (long)&sf->REG_NAME(r11) - new_cfa; |
fs->regs.reg[12].how = REG_SAVED_OFFSET; |
fs->regs.reg[12].loc.offset = (long)&sf->REG_NAME(r12) - new_cfa; |
fs->regs.reg[13].how = REG_SAVED_OFFSET; |
fs->regs.reg[13].loc.offset = (long)&sf->REG_NAME(r13) - new_cfa; |
fs->regs.reg[14].how = REG_SAVED_OFFSET; |
fs->regs.reg[14].loc.offset = (long)&sf->REG_NAME(r14) - new_cfa; |
fs->regs.reg[15].how = REG_SAVED_OFFSET; |
fs->regs.reg[15].loc.offset = (long)&sf->REG_NAME(r15) - new_cfa; |
fs->regs.reg[16].how = REG_SAVED_OFFSET; |
fs->regs.reg[16].loc.offset = (long)&sf->REG_NAME(rip) - new_cfa; |
fs->retaddr_column = 16; |
fs->signal_frame = 1; |
return _URC_NO_REASON; |
} |
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#else /* Next section is for i386 */ |
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#define MD_FALLBACK_FRAME_STATE_FOR x86_freebsd_fallback_frame_state |
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/* |
* We can't use KERN_PS_STRINGS anymore if we want to support FreeBSD32 |
* compat on AMD64. The sigtramp is in a shared page in that case so the |
* x86_sigtramp_range only works on a true i386 system. We have to |
* search for the sigtramp frame if we want it working everywhere. |
*/ |
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static _Unwind_Reason_Code |
x86_freebsd_fallback_frame_state |
(struct _Unwind_Context *context, _Unwind_FrameState *fs) |
{ |
struct sigframe *sf; |
long new_cfa; |
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/* |
* i386 sigtramp frame we are looking for follows. |
* Apparently PSL_VM is variable, so we can't look past context->ra + 4 |
* <sigcode>: |
* 0: ff 54 24 10 call *0x10(%esp) *SIGF_HANDLER |
* 4: 8d 44 24 20 lea 0x20(%esp),%eax SIGF_UC |
* 8: 50 push %eax |
* 9: f7 40 54 00 00 02 00 testl $0x20000,0x54(%eax) $PSL_VM |
* 10: 75 03 jne 15 <sigcode+0x15> |
* 12: 8e 68 14 mov 0x14(%eax),%gs UC_GS |
* 15: b8 a1 01 00 00 mov 0x1a1,%eax $SYS_sigreturn |
*/ |
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if (!( *(unsigned int *)(context->ra - 4) == 0x102454ff |
&& *(unsigned int *)(context->ra) == 0x2024448d )) |
return _URC_END_OF_STACK; |
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sf = (struct sigframe *) context->cfa; |
new_cfa = sf->REG_NAME(esp); |
fs->regs.cfa_how = CFA_REG_OFFSET; |
fs->regs.cfa_reg = 4; |
fs->regs.cfa_offset = new_cfa - (long) context->cfa; |
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/* 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)&sf->REG_NAME(eax) - new_cfa; |
fs->regs.reg[3].how = REG_SAVED_OFFSET; |
fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(ebx) - new_cfa; |
fs->regs.reg[1].how = REG_SAVED_OFFSET; |
fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(ecx) - new_cfa; |
fs->regs.reg[2].how = REG_SAVED_OFFSET; |
fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(edx) - new_cfa; |
fs->regs.reg[6].how = REG_SAVED_OFFSET; |
fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(esi) - new_cfa; |
fs->regs.reg[7].how = REG_SAVED_OFFSET; |
fs->regs.reg[7].loc.offset = (long)&sf->REG_NAME(edi) - new_cfa; |
fs->regs.reg[5].how = REG_SAVED_OFFSET; |
fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(ebp) - new_cfa; |
fs->regs.reg[8].how = REG_SAVED_OFFSET; |
fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(eip) - new_cfa; |
fs->retaddr_column = 8; |
fs->signal_frame = 1; |
return _URC_NO_REASON; |
} |
#endif /* ifdef __x86_64__ */ |