mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-10 03:54:48 +00:00
174 lines
6.9 KiB
C
174 lines
6.9 KiB
C
/* DWARF2 EH unwinding support for FreeBSD: AMD x86-64 and x86.
|
|
Copyright (C) 2015-2016 Free Software Foundation, Inc.
|
|
Contributed by John Marino <gnugcc@marino.st>
|
|
|
|
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 <sys/types.h>
|
|
#include <signal.h>
|
|
#include <sys/ucontext.h>
|
|
#include <machine/sigframe.h>
|
|
|
|
#define REG_NAME(reg) sf_uc.uc_mcontext.mc_## reg
|
|
|
|
#ifdef __x86_64__
|
|
#define MD_FALLBACK_FRAME_STATE_FOR x86_64_freebsd_fallback_frame_state
|
|
|
|
static _Unwind_Reason_Code
|
|
x86_64_freebsd_fallback_frame_state
|
|
(struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
|
{
|
|
struct sigframe *sf;
|
|
long new_cfa;
|
|
|
|
/* 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.
|
|
|
|
<pc + 00>: lea 0x10(%rsp),%rdi
|
|
<pc + 05>: pushq $0x0
|
|
<pc + 17>: mov $0x1a1,%rax
|
|
<pc + 14>: syscall
|
|
|
|
If we can't find this pattern, we're at the end of the stack.
|
|
*/
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
#else /* Next section is for i386 */
|
|
|
|
#define MD_FALLBACK_FRAME_STATE_FOR x86_freebsd_fallback_frame_state
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
static _Unwind_Reason_Code
|
|
x86_freebsd_fallback_frame_state
|
|
(struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
|
{
|
|
struct sigframe *sf;
|
|
long new_cfa;
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
if (!( *(unsigned int *)(context->ra - 4) == 0x102454ff
|
|
&& *(unsigned int *)(context->ra) == 0x2024448d ))
|
|
return _URC_END_OF_STACK;
|
|
|
|
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;
|
|
|
|
/* 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__ */
|