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/* Target-dependent code for OpenBSD/mips64.

   Copyright (C) 2004, 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 "regcache.h"

#include "regset.h"

#include "trad-frame.h"

#include "tramp-frame.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include "mips-tdep.h"

#include "solib-svr4.h"

#define MIPS64OBSD_NUM_REGS 73

/* Core file support.  */

/* Supply register REGNUM from the buffer specified by GREGS and LEN

   in the general-purpose register set REGSET to register cache

   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

static void

mips64obsd_supply_gregset (const struct regset *regset,

                           struct regcache *regcache, int regnum,

                           const void *gregs, size_t len)

{

  const char *regs = gregs;

  int i;

  for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)

    {

      if (regnum == i || regnum == -1)

        regcache_raw_supply (regcache, i, regs + i * 8);

    }

}

/* OpenBSD/mips64 register set.  */

static struct regset mips64obsd_gregset =

{

  NULL,

  mips64obsd_supply_gregset

};

/* Return the appropriate register set for the core section identified

   by SECT_NAME and SECT_SIZE.  */

static const struct regset *

mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,

                                     const char *sect_name, size_t sect_size)

{

  if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8)

    return &mips64obsd_gregset;

  return NULL;

}

/* Signal trampolines.  */

static void

mips64obsd_sigframe_init (const struct tramp_frame *self,

                          struct frame_info *next_frame,

                          struct trad_frame_cache *cache,

                          CORE_ADDR func)

{

  struct gdbarch *gdbarch = get_frame_arch (next_frame);

  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,

                                     MIPS_SP_REGNUM

                                     + gdbarch_num_regs (gdbarch));

  sigcontext_addr = sp + 32;

  /* PC.  */

  regnum = mips_regnum (gdbarch)->pc;

  trad_frame_set_reg_addr (cache,

                           regnum + gdbarch_num_regs (gdbarch),

                            sigcontext_addr + 16);

  /* GPRs.  */

  for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;

       regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)

    trad_frame_set_reg_addr (cache,

                             regnum + gdbarch_num_regs (gdbarch),

                             addr);

  /* HI and LO.  */

  regnum = mips_regnum (gdbarch)->lo;

  trad_frame_set_reg_addr (cache,

                           regnum + gdbarch_num_regs (gdbarch),

                           sigcontext_addr + 280);

  regnum = mips_regnum (gdbarch)->hi;

  trad_frame_set_reg_addr (cache,

                           regnum + gdbarch_num_regs (gdbarch),

                           sigcontext_addr + 288);

  /* TODO: Handle the floating-point registers.  */

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

}

static const struct tramp_frame mips64obsd_sigframe =

{

  SIGTRAMP_FRAME,

  MIPS_INSN32_SIZE,

  {

    { 0x67a40020, -1 },         /* daddiu  a0,sp,32 */

    { 0x24020067, -1 },         /* li      v0,103 */

    { 0x0000000c, -1 },         /* syscall */

    { 0x0000000d, -1 },         /* break */

    { TRAMP_SENTINEL_INSN, -1 }

  },

  mips64obsd_sigframe_init

};

static void

mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged

     way GDB works, forces us to pretend we can handle them all.  */

  set_gdbarch_regset_from_core_section

    (gdbarch, mips64obsd_regset_from_core_section);

  tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);

  /* OpenBSD/mips64 has SVR4-style shared libraries.  */

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_lp64_fetch_link_map_offsets);

}

/* Provide a prototype to silence -Wmissing-prototypes.  */

void _initialize_mips64obsd_tdep (void);

void

_initialize_mips64obsd_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,

                          mips64obsd_init_abi);

}