109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/* DWARF2 EH unwinding support for FreeBSD/ARM64 (aarch64).
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Copyright (C) 2017-2020 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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/* Identify a signal frame, and set the frame state data appropriately.
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See unwind-dw2.c for the structs. */
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/* Always include AArch64 unwinder header file. */
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#include "config/aarch64/aarch64-unwind.h"
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#include <sys/types.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/ucontext.h>
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#include <machine/frame.h>
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#include <sys/user.h>
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#include <sys/sysctl.h>
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#define REG_NAME(reg) mc_gpregs.gp_## reg
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#define XREG(num) mc_gpregs.gp_x[num]
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#define DARC __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
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#define MD_FALLBACK_FRAME_STATE_FOR aarch64_freebsd_fallback_frame_state
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static int
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aarch64_outside_sigtramp_range (unsigned char *pc)
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{
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static int sigtramp_range_determined = 0;
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static unsigned char *sigtramp_start, *sigtramp_end;
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if (sigtramp_range_determined == 0)
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{
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struct kinfo_sigtramp kst = {0};
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size_t len = sizeof (kst);
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int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_SIGTRAMP, getpid() };
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sigtramp_range_determined = 1;
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if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
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{
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sigtramp_range_determined = 2;
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sigtramp_start = kst.ksigtramp_start;
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sigtramp_end = kst.ksigtramp_end;
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}
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}
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if (sigtramp_range_determined < 2) /* sysctl failed if < 2 */
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return 1;
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return (pc < sigtramp_start || pc >= sigtramp_end);
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}
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static _Unwind_Reason_Code
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aarch64_freebsd_fallback_frame_state
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(struct _Unwind_Context *context, _Unwind_FrameState *fs)
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{
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int n;
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struct sigframe *sf;
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mcontext_t *sc;
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_Unwind_Ptr new_cfa;
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if (aarch64_outside_sigtramp_range(context->ra))
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return _URC_END_OF_STACK;
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sf = (struct sigframe *) context->cfa;
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sc = &sf->sf_uc.uc_mcontext;
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new_cfa = (_Unwind_Ptr) sc;
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
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fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
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for (n = 0; n < 32; n++)
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fs->regs.reg[n].how = REG_SAVED_OFFSET;
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for (n = 0; n < 30; n++)
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fs->regs.reg[n].loc.offset = (_Unwind_Ptr) &(sc->XREG(n)) - new_cfa;
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fs->regs.reg[30].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(lr)) - new_cfa;
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fs->regs.reg[31].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(sp)) - new_cfa;
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fs->regs.reg[DARC].how = REG_SAVED_OFFSET;
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fs->regs.reg[DARC].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(elr)) - new_cfa;
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fs->retaddr_column = DARC;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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