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/* Target-dependent code for NetBSD/hppa

   Copyright (C) 2008, 2009, 2010 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 "hppa-tdep.h"

#include "hppabsd-tdep.h"

/* From <machine/mcontext.h>.  */

static int hppanbsd_mc_reg_offset[] =

{

  /* r0 ... r31 */

      -1,   1 * 4,   2 * 4,   3 * 4,

   4 * 4,   5 * 4,   6 * 4,   7 * 4,

   8 * 4,   9 * 4,  10 * 4,  11 * 4,

  12 * 4,  13 * 4,  14 * 4,  15 * 4,

  16 * 4,  17 * 4,  18 * 4,  19 * 4,

  20 * 4,  21 * 4,  22 * 4,  23 * 4,

  24 * 4,  25 * 4,  26 * 4,  27 * 4,

  28 * 4,  29 * 4,  30 * 4,  31 * 4,

  32 * 4,       /* HPPA_SAR_REGNUM */

  35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */

  33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */

  36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */

  34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */

  -1,           /* HPPA_EIEM_REGNUM */

  -1,           /* HPPA_IIR_REGNUM */

  -1,           /* HPPA_ISR_REGNUM */

  -1,           /* HPPA_IOR_REGNUM */

  -1,           /* spare? */

  41 * 4,       /* HPPA_SR4_REGNUM */

  37 * 4,       /* sr0 */

  38 * 4,       /* sr1 */

  39 * 4,       /* sr2 */

  40 * 4,       /* sr3 */

  /* more tbd */

};

static void hppanbsd_sigtramp_cache_init (const struct tramp_frame *,

                                         struct frame_info *,

                                         struct trad_frame_cache *,

                                         CORE_ADDR);

static const struct tramp_frame hppanbsd_sigtramp_si4 =

{

  SIGTRAMP_FRAME,

  4,

  {

    { 0xc7d7c012, -1 }, /*      bb,>=,n %arg3, 30, 1f           */

    { 0xd6e01c1e, -1 }, /*       depwi 0,31,2,%arg3             */

    { 0x0ee81093, -1 }, /*      ldw 4(%arg3), %r19              */

    { 0x0ee01097, -1 }, /*      ldw 0(%arg3), %arg3             */

                        /* 1:                                   */

    { 0xe8404000, -1 }, /*      blr %r0, %rp                    */

    { 0xeae0c002, -1 }, /*      bv,n %r0(%arg3)                 */

    { 0x08000240, -1 }, /*       nop                            */

    { 0x0803025a, -1 }, /*      copy %r3, %arg0                 */

    { 0x20200801, -1 }, /*      ldil -40000000, %r1             */

    { 0xe420e008, -1 }, /*      be,l 4(%sr7, %r1), %sr0, %r31   */

    { 0x34160268, -1 }, /*       ldi 134, %t1 ; SYS_setcontext  */

    { 0x081c025a, -1 }, /*      copy ret0, %arg0                */

    { 0x20200801, -1 }, /*      ldil -40000000, %r1             */

    { 0xe420e008, -1 }, /*      be,l 4(%sr7, %r1), %sr0, %r31   */

    { 0x34160002, -1 }, /*       ldi 1, %t1 ; SYS_exit          */

    { TRAMP_SENTINEL_INSN, -1 }

  },

  hppanbsd_sigtramp_cache_init

};

static void

hppanbsd_sigtramp_cache_init (const struct tramp_frame *self,

                             struct frame_info *this_frame,

                             struct trad_frame_cache *this_cache,

                             CORE_ADDR func)

{

  struct gdbarch *gdbarch = get_frame_arch (this_frame);

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  CORE_ADDR sp = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);

  CORE_ADDR base;

  int *reg_offset;

  int num_regs;

  int i;

  reg_offset = hppanbsd_mc_reg_offset;

  num_regs = ARRAY_SIZE (hppanbsd_mc_reg_offset);

  /* frame pointer */

  base = sp - 0x280;

  /* offsetof(struct sigframe_siginfo, sf_uc) = 128 */

  base += 128;

  /* offsetof(ucontext_t, uc_mcontext) == 40 */

  base += 40;

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

    if (reg_offset[i] != -1)

      trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);

  /* Construct the frame ID using the function start.  */

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

}

/* Core file support.  */

/* Sizeof `struct reg' in <machine/reg.h>.  */

#define HPPANBSD_SIZEOF_GREGS   (44 * 4)

static int hppanbsd_reg_offset[] =

{

  /* r0 ... r31 */

      -1,   1 * 4,   2 * 4,   3 * 4,

   4 * 4,   5 * 4,   6 * 4,   7 * 4,

   8 * 4,   9 * 4,  10 * 4,  11 * 4,

  12 * 4,  13 * 4,  14 * 4,  15 * 4,

  16 * 4,  17 * 4,  18 * 4,  19 * 4,

  20 * 4,  21 * 4,  22 * 4,  23 * 4,

  24 * 4,  25 * 4,  26 * 4,  27 * 4,

  28 * 4,  29 * 4,  30 * 4,  31 * 4,

  32 * 4,       /* HPPA_SAR_REGNUM */

  35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */

  33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */

  36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */

  34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */

  -1,           /* HPPA_EIEM_REGNUM */

  -1,           /* HPPA_IIR_REGNUM */

  -1,           /* HPPA_ISR_REGNUM */

  -1,           /* HPPA_IOR_REGNUM */

};

/* 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

hppanbsd_supply_gregset (const struct regset *regset, struct regcache *regcache,

                     int regnum, const void *gregs, size_t len)

{

  const gdb_byte *regs = gregs;

  size_t offset;

  int i;

  gdb_assert (len >= HPPANBSD_SIZEOF_GREGS);

  for (i = 0; i < ARRAY_SIZE (hppanbsd_reg_offset); i++)

    if (hppanbsd_reg_offset[i] != -1)

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

        regcache_raw_supply (regcache, i, regs + hppanbsd_reg_offset[i]);

}

/* NetBSD/hppa register set.  */

static struct regset hppanbsd_gregset =

{

  NULL,

  hppanbsd_supply_gregset

};

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

   by SECT_NAME and SECT_SIZE.  */

static const struct regset *

hppanbsd_regset_from_core_section (struct gdbarch *gdbarch,

                                  const char *sect_name, size_t sect_size)

{

  if (strcmp (sect_name, ".reg") == 0 && sect_size >= HPPANBSD_SIZEOF_GREGS)

    return &hppanbsd_gregset;

  return NULL;

}

static void

hppanbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  /* Obviously NetBSD is BSD-based.  */

  hppabsd_init_abi (info, gdbarch);

  /* Core file support.  */

  set_gdbarch_regset_from_core_section

    (gdbarch, hppanbsd_regset_from_core_section);

  tramp_frame_prepend_unwinder (gdbarch, &hppanbsd_sigtramp_si4);

}

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

extern initialize_file_ftype _initialize_hppanbsd_tdep;

void

_initialize_hppanbsd_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_NETBSD_ELF,

                          hppanbsd_init_abi);

}