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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [armobsd-tdep.c] - Blame information for rev 840

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1 24 jeremybenn
/* Target-dependent code for OpenBSD/arm.
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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 "osabi.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "gdb_string.h"
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#include "obsd-tdep.h"
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#include "arm-tdep.h"
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#include "solib-svr4.h"
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/* Signal trampolines.  */
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static void
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armobsd_sigframe_init (const struct tramp_frame *self,
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                       struct frame_info *next_frame,
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                       struct trad_frame_cache *cache,
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                       CORE_ADDR func)
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{
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  CORE_ADDR sp, sigcontext_addr, addr;
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  int regnum;
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  /* We find the appropriate instance of `struct sigcontext' at a
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     fixed offset in the signal frame.  */
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  sp = frame_unwind_register_signed (next_frame, ARM_SP_REGNUM);
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  sigcontext_addr = sp + 16;
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  /* PC.  */
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  trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
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  /* GPRs.  */
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  for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
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       regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
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    trad_frame_set_reg_addr (cache, regnum, addr);
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  trad_frame_set_id (cache, frame_id_build (sp, func));
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}
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static const struct tramp_frame armobsd_sigframe =
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{
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  SIGTRAMP_FRAME,
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  4,
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  {
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    { 0xe28d0010, -1 },         /* add     r0, sp, #16 */
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    { 0xef000067, -1 },         /* swi     SYS_sigreturn */
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    { 0xef000001, -1 },         /* swi     SYS_exit */
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    { 0xeafffffc, -1 },         /* b       . - 8 */
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    { TRAMP_SENTINEL_INSN, -1 }
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  },
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  armobsd_sigframe_init
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};
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/* Override default thumb breakpoints.  */
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static const char arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
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static const char arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};
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static void
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armobsd_init_abi (struct gdbarch_info info,
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                  struct gdbarch *gdbarch)
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{
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  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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  if (tdep->fp_model == ARM_FLOAT_AUTO)
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    tdep->fp_model = ARM_FLOAT_SOFT_VFP;
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  tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);
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  /* OpenBSD/arm uses SVR4-style shared libraries.  */
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  set_solib_svr4_fetch_link_map_offsets
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    (gdbarch, svr4_ilp32_fetch_link_map_offsets);
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  set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
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  tdep->jb_pc = 24;
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  tdep->jb_elt_size = 4;
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  set_gdbarch_regset_from_core_section
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    (gdbarch, armbsd_regset_from_core_section);
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  /* OpenBSD/arm uses -fpcc-struct-return by default.  */
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  tdep->struct_return = pcc_struct_return;
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  /* Single stepping.  */
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  set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
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  /* Breakpoints.  */
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  switch (info.byte_order)
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    {
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    case BFD_ENDIAN_BIG:
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      tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
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      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
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      break;
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    case BFD_ENDIAN_LITTLE:
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      tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
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      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
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      break;
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    }
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}
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static enum gdb_osabi
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armobsd_core_osabi_sniffer (bfd *abfd)
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{
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  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
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    return GDB_OSABI_OPENBSD_ELF;
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  return GDB_OSABI_UNKNOWN;
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}
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void
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_initialize_armobsd_tdep (void)
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{
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  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
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  gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,
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                                  armobsd_core_osabi_sniffer);
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  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
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                          armobsd_init_abi);
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}

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