136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
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/* Target-dependent code for OpenBSD/alpha.
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Copyright (C) 2006 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 2 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, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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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 "alpha-tdep.h"
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#include "alphabsd-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 (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 (CORE_ADDR pc, 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 (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 (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 (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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if (alphaobsd_sigtramp_offset (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 frame_unwind_register_unsigned (next_frame, ALPHA_A0_REGNUM + 2);
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}
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else if (alphaobsd_sigtramp_offset (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 = frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM);
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return get_frame_memory_unsigned (next_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 frame_unwind_register_unsigned (next_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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struct gdbarch_tdep *tdep = 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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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_regset_from_core_section
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(gdbarch, alphanbsd_regset_from_core_section);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_alphaobsd_tdep (void);
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void
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_initialize_alphaobsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD_ELF,
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alphaobsd_init_abi);
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}
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