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170206b641
The SFrame is well supported by x86 architecture since binutils 2.41. Enable it to be used as default frame tracer. Signed-off-by: Claudiu Zissulescu <claudiu.zissulescu-ianculescu@oracle.com> Reviewed-by: DJ Delorie <dj@redhat.com>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* Signal frame backtracing support for SFrame on AMD, x86-64 and x86.
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Copyright (C) 2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License
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as published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This code is inspired from libgcc's MD_FALLBACK_FRAME_STATE_FOR
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implementation. See libgcc/config/i386/linux-unwind.h */
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#include <signal.h>
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#include <sys/ucontext.h>
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#ifdef __x86_64__
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/* SFrame is only supported by x86_64 targets. */
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#define MD_DECODE_SIGNAL_FRAME x86_64_decode_signal_frame
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#ifdef __LP64__
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#define RT_SIGRETURN_SYSCALL 0x050f0000000fc0c7ULL
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#else
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#define RT_SIGRETURN_SYSCALL 0x050f40000201c0c7ULL
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#endif
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static _Unwind_Reason_Code
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x86_64_decode_signal_frame (frame *frame)
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{
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unsigned char *pc = (unsigned char *) frame->pc;
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mcontext_t *st;
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unsigned char pc0 = *(unsigned char *)(pc + 0);
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unsigned long long pc1;
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memcpy (&pc1, pc + 1, sizeof (unsigned long long));
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/* movq $__NR_rt_sigreturn, %rax ; syscall. */
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if ( pc0 == 0x48
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&& pc1 == RT_SIGRETURN_SYSCALL)
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{
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ucontext_t *uc_ = (ucontext_t *)frame->sp;
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st = &uc_->uc_mcontext;
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}
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else
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return _URC_END_OF_STACK;
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frame->pc = (_Unwind_Ptr) st->gregs[REG_RIP];
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frame->sp = (_Unwind_Ptr) st->gregs[REG_RSP];
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frame->fp = (_Unwind_Ptr) st->gregs[REG_RBP];
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return _URC_NO_REASON;
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}
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#define MD_DETECT_OUTERMOST_FRAME x86_64_detect_outermost_frame
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static _Unwind_Reason_Code
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x86_64_detect_outermost_frame (frame *frame)
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{
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/* Outermost frame has the frame pointer cleared. */
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if (frame->fp == 0)
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return _URC_END_OF_STACK;
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return _URC_NO_REASON;
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}
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#endif /* ifdef __x86_64__ */
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