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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [alphaobsd-tdep.c] - Blame information for rev 321

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1 24 jeremybenn
/* Target-dependent code for OpenBSD/alpha.
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   Copyright (C) 2006, 2007, 2008 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 "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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  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_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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