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/* Target-dependent code for OpenBSD/arm.

   Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.

   This file is part of GDB.

   This program 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 of the License, or

   (at your option) any later version.

   This program 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.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "osabi.h"

#include "trad-frame.h"

#include "tramp-frame.h"

#include "gdb_string.h"

#include "obsd-tdep.h"

#include "arm-tdep.h"

#include "solib-svr4.h"

/* Signal trampolines.  */

static void

armobsd_sigframe_init (const struct tramp_frame *self,

                       struct frame_info *next_frame,

                       struct trad_frame_cache *cache,

                       CORE_ADDR func)

{

  CORE_ADDR sp, sigcontext_addr, addr;

  int regnum;

  /* We find the appropriate instance of `struct sigcontext' at a

     fixed offset in the signal frame.  */

  sp = frame_unwind_register_signed (next_frame, ARM_SP_REGNUM);

  sigcontext_addr = sp + 16;

  /* PC.  */

  trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);

  /* GPRs.  */

  for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;

       regnum <= ARM_LR_REGNUM; regnum++, addr += 4)

    trad_frame_set_reg_addr (cache, regnum, addr);

  trad_frame_set_id (cache, frame_id_build (sp, func));

}

static const struct tramp_frame armobsd_sigframe =

{

  SIGTRAMP_FRAME,

  4,

  {

    { 0xe28d0010, -1 },         /* add     r0, sp, #16 */

    { 0xef000067, -1 },         /* swi     SYS_sigreturn */

    { 0xef000001, -1 },         /* swi     SYS_exit */

    { 0xeafffffc, -1 },         /* b       . - 8 */

    { TRAMP_SENTINEL_INSN, -1 }

  },

  armobsd_sigframe_init

};

/* Override default thumb breakpoints.  */

static const char arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};

static const char arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};

static void

armobsd_init_abi (struct gdbarch_info info,

                  struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  if (tdep->fp_model == ARM_FLOAT_AUTO)

    tdep->fp_model = ARM_FLOAT_SOFT_VFP;

  tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);

  /* OpenBSD/arm uses SVR4-style shared libraries.  */

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

  set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);

  tdep->jb_pc = 24;

  tdep->jb_elt_size = 4;

  set_gdbarch_regset_from_core_section

    (gdbarch, armbsd_regset_from_core_section);

  /* OpenBSD/arm uses -fpcc-struct-return by default.  */

  tdep->struct_return = pcc_struct_return;

  /* Single stepping.  */

  set_gdbarch_software_single_step (gdbarch, arm_software_single_step);

  /* Breakpoints.  */

  switch (info.byte_order)

    {

    case BFD_ENDIAN_BIG:

      tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;

      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);

      break;

    case BFD_ENDIAN_LITTLE:

      tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;

      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);

      break;

    }

}

static enum gdb_osabi

armobsd_core_osabi_sniffer (bfd *abfd)

{

  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)

    return GDB_OSABI_OPENBSD_ELF;

  return GDB_OSABI_UNKNOWN;

}

void

_initialize_armobsd_tdep (void)

{

  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */

  gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,

                                  armobsd_core_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,

                          armobsd_init_abi);

}