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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Signal frame backtracing support for SFrame on AARCH64.
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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/aarch64/linux-unwind.h */
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#include <signal.h>
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#include <sys/ucontext.h>
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#include <kernel_rt_sigframe.h>
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#ifdef __AARCH64EL__
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#define MOVZ_X8_8B 0xd2801168
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#define SVC_0 0xd4000001
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#else
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#define MOVZ_X8_8B 0x681180d2
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#define SVC_0 0x010000d4
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#endif
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#define MD_DECODE_SIGNAL_FRAME aarch64_decode_signal_frame
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static _Unwind_Reason_Code
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aarch64_decode_signal_frame (frame *frame)
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{
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unsigned int *pc = (unsigned int *) frame->pc;
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mcontext_t *mt;
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struct kernel_rt_sigframe *rt_;
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if ((frame->pc & 3) != 0)
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return _URC_END_OF_STACK;
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/* A signal frame will have a return address pointing to
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__kernel_rt_sigreturn. This code is hardwired as:
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0xd2801168 movz x8, #0x8b
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0xd4000001 svc 0x0
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*/
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if (pc[0] != MOVZ_X8_8B || pc[1] != SVC_0)
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return _URC_END_OF_STACK;
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rt_ = (struct kernel_rt_sigframe *) frame->sp;
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mt = &rt_->uc.uc_mcontext;
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/* Frame pointer register number. */
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#define FP_REGNUM 30
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frame->pc = (_Unwind_Ptr) mt->pc;
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frame->sp = (_Unwind_Ptr) mt->sp;
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frame->fp = (_Unwind_Ptr) mt->regs[FP_REGNUM];
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return _URC_NO_REASON;
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}
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#define MD_DETECT_OUTERMOST_FRAME aarch64_detect_outermost_frame
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static _Unwind_Reason_Code
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aarch64_detect_outermost_frame (frame *frame)
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{
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/* Initial frame has LR and FP set to zero. We track only FP. */
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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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