forked from Imagelibrary/binutils-gdb
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
136 lines
4.0 KiB
C
136 lines
4.0 KiB
C
/* Target-dependent code for OpenBSD/alpha.
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Copyright (C) 2006-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "obsd-tdep.h"
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#include "alpha-tdep.h"
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#include "alpha-bsd-tdep.h"
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#include "solib-svr4.h"
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/* Signal trampolines. */
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/* The OpenBSD kernel maps the signal trampoline at some random
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location in user space, which means that the traditional BSD way of
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detecting it won't work.
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The signal trampoline will be mapped at an address that is page
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aligned. We recognize the signal trampoline by looking for the
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sigreturn system call. */
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static const int alphaobsd_page_size = 8192;
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static LONGEST
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alphaobsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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return (pc & (alphaobsd_page_size - 1));
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}
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static int
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alphaobsd_pc_in_sigtramp (struct gdbarch *gdbarch,
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CORE_ADDR pc, const char *name)
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{
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CORE_ADDR start_pc = (pc & ~(alphaobsd_page_size - 1));
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unsigned insn;
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if (name)
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return 0;
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/* Check for "". */
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insn = alpha_read_insn (gdbarch, start_pc + 5 * ALPHA_INSN_SIZE);
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if (insn != 0x201f0067)
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return 0;
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/* Check for "". */
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insn = alpha_read_insn (gdbarch, start_pc + 6 * ALPHA_INSN_SIZE);
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if (insn != 0x00000083)
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return 0;
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return 1;
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}
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static CORE_ADDR
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alphaobsd_sigcontext_addr (frame_info_ptr this_frame)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR pc = get_frame_pc (this_frame);
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if (alphaobsd_sigtramp_offset (gdbarch, pc) < 3 * ALPHA_INSN_SIZE)
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{
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/* On entry, a pointer the `struct sigcontext' is passed in %a2. */
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return get_frame_register_unsigned (this_frame, ALPHA_A0_REGNUM + 2);
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}
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else if (alphaobsd_sigtramp_offset (gdbarch, pc) < 4 * ALPHA_INSN_SIZE)
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{
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/* It is stored on the stack Before calling the signal handler. */
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CORE_ADDR sp;
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sp = get_frame_register_unsigned (this_frame, ALPHA_SP_REGNUM);
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return get_frame_memory_unsigned (this_frame, sp, 8);
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}
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else
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{
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/* It is reloaded into %a0 for the sigreturn(2) call. */
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return get_frame_register_unsigned (this_frame, ALPHA_A0_REGNUM);
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}
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}
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static void
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alphaobsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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alpha_gdbarch_tdep *tdep = gdbarch_tdep<alpha_gdbarch_tdep> (gdbarch);
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/* Hook into the DWARF CFI frame unwinder. */
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alpha_dwarf2_init_abi (info, gdbarch);
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/* Hook into the MDEBUG frame unwinder. */
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alpha_mdebug_init_abi (info, gdbarch);
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/* OpenBSD/alpha 3.0 and earlier does not provide single step
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support via ptrace(2); use software single-stepping for now. */
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set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
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/* OpenBSD/alpha has SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
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tdep->dynamic_sigtramp_offset = alphaobsd_sigtramp_offset;
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tdep->pc_in_sigtramp = alphaobsd_pc_in_sigtramp;
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tdep->sigcontext_addr = alphaobsd_sigcontext_addr;
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, alphanbsd_iterate_over_regset_sections);
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}
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void _initialize_alphaobsd_tdep ();
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void
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_initialize_alphaobsd_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD,
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alphaobsd_init_abi);
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}
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