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- /* DWARF2 EH unwinding support for FreeBSD/ARM64 (aarch64).
- Copyright (C) 2017-2022 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/>. */
- /* Identify a signal frame, and set the frame state data appropriately.
- See unwind-dw2.c for the structs. */
- /* Always include AArch64 unwinder header file. */
- #include "config/aarch64/aarch64-unwind.h"
- #include <sys/types.h>
- #include <signal.h>
- #include <unistd.h>
- #include <sys/ucontext.h>
- #include <machine/frame.h>
- #include <sys/user.h>
- #include <sys/sysctl.h>
- #define REG_NAME(reg) mc_gpregs.gp_## reg
- #define XREG(num) mc_gpregs.gp_x[num]
- #define DARC __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
- #define MD_FALLBACK_FRAME_STATE_FOR aarch64_freebsd_fallback_frame_state
- static int
- aarch64_outside_sigtramp_range (unsigned char *pc)
- {
- static int sigtramp_range_determined = 0;
- static unsigned char *sigtramp_start, *sigtramp_end;
- if (sigtramp_range_determined == 0)
- {
- struct kinfo_sigtramp kst = {0};
- size_t len = sizeof (kst);
- int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_SIGTRAMP, getpid() };
- sigtramp_range_determined = 1;
- if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
- {
- sigtramp_range_determined = 2;
- sigtramp_start = kst.ksigtramp_start;
- sigtramp_end = kst.ksigtramp_end;
- }
- }
- if (sigtramp_range_determined < 2) /* sysctl failed if < 2 */
- return 1;
- return (pc < sigtramp_start || pc >= sigtramp_end);
- }
- static _Unwind_Reason_Code
- aarch64_freebsd_fallback_frame_state
- (struct _Unwind_Context *context, _Unwind_FrameState *fs)
- {
- int n;
- struct sigframe *sf;
- mcontext_t *sc;
- _Unwind_Ptr new_cfa;
- if (aarch64_outside_sigtramp_range(context->ra))
- return _URC_END_OF_STACK;
- sf = (struct sigframe *) context->cfa;
- sc = &sf->sf_uc.uc_mcontext;
- new_cfa = (_Unwind_Ptr) sc;
- fs->regs.cfa_how = CFA_REG_OFFSET;
- fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
- fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
- for (n = 0; n < 32; n++)
- fs->regs.reg[n].how = REG_SAVED_OFFSET;
- for (n = 0; n < 30; n++)
- fs->regs.reg[n].loc.offset = (_Unwind_Ptr) &(sc->XREG(n)) - new_cfa;
- fs->regs.reg[30].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(lr)) - new_cfa;
- fs->regs.reg[31].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(sp)) - new_cfa;
- fs->regs.reg[DARC].how = REG_SAVED_OFFSET;
- fs->regs.reg[DARC].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(elr)) - new_cfa;
- fs->retaddr_column = DARC;
- fs->signal_frame = 1;
- return _URC_NO_REASON;
- }
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