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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [m68kbsd-tdep.c] - Blame information for rev 227

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1 227 jeremybenn
/* Target-dependent code for Motorola 68000 BSD's.
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   Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
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   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 "arch-utils.h"
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#include "frame.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "gdbtypes.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "m68k-tdep.h"
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#include "solib-svr4.h"
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/* Core file support.  */
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/* Sizeof `struct reg' in <machine/reg.h>.  */
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#define M68KBSD_SIZEOF_GREGS    (18 * 4)
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/* Sizeof `struct fpreg' in <machine/reg.h.  */
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#define M68KBSD_SIZEOF_FPREGS   (((8 * 3) + 3) * 4)
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int
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m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
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{
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  int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
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  if (regnum >= M68K_FPC_REGNUM)
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    return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
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  return (regnum - M68K_FP0_REGNUM) * fp_len;
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}
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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   in the floating-point register set REGSET to register cache
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   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
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static void
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m68kbsd_supply_fpregset (const struct regset *regset,
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                         struct regcache *regcache,
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                         int regnum, const void *fpregs, size_t len)
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{
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  struct gdbarch *gdbarch = get_regcache_arch (regcache);
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  const gdb_byte *regs = fpregs;
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  int i;
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  gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
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  for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
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    {
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      if (regnum == i || regnum == -1)
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        regcache_raw_supply (regcache, i,
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                             regs + m68kbsd_fpreg_offset (gdbarch, i));
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    }
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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   in the general-purpose register set REGSET to register cache
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   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
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static void
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m68kbsd_supply_gregset (const struct regset *regset,
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                        struct regcache *regcache,
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                        int regnum, const void *gregs, size_t len)
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{
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  const gdb_byte *regs = gregs;
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  int i;
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  gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
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  for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
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    {
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      if (regnum == i || regnum == -1)
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        regcache_raw_supply (regcache, i, regs + i * 4);
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    }
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  if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
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    {
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      regs += M68KBSD_SIZEOF_GREGS;
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      len -= M68KBSD_SIZEOF_GREGS;
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      m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
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    }
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}
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/* Motorola 68000 register sets.  */
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static struct regset m68kbsd_gregset =
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{
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  NULL,
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  m68kbsd_supply_gregset
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};
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static struct regset m68kbsd_fpregset =
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{
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  NULL,
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  m68kbsd_supply_fpregset
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};
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/* Return the appropriate register set for the core section identified
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   by SECT_NAME and SECT_SIZE.  */
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static const struct regset *
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m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
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                                  const char *sect_name, size_t sect_size)
127
{
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  if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
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    return &m68kbsd_gregset;
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  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
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    return &m68kbsd_fpregset;
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134
  return NULL;
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}
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137
 
138
/* Signal trampolines.  */
139
 
140
static void
141
m68kobsd_sigtramp_cache_init (const struct tramp_frame *self,
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                              struct frame_info *this_frame,
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                              struct trad_frame_cache *this_cache,
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                              CORE_ADDR func)
145
{
146
  CORE_ADDR addr, base, pc;
147
  int regnum;
148
 
149
  base = get_frame_register_unsigned (this_frame, M68K_SP_REGNUM);
150
 
151
  /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
152
     pointer.  Adjust the frame base accordingly.  */
153
  pc = get_frame_register_unsigned (this_frame, M68K_PC_REGNUM);
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  if ((pc - func) > 8)
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    base -= 4;
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  /* Get frame pointer, stack pointer, program counter and processor
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     state from `struct sigcontext'.  */
159
  addr = get_frame_memory_unsigned (this_frame, base + 8, 4);
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  trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8);
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  trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12);
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  trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20);
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  trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24);
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  /* The sc_ap member of `struct sigcontext' points to additional
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     hardware state.  Here we find the missing registers.  */
167
  addr = get_frame_memory_unsigned (this_frame, addr + 16, 4) + 4;
168
  for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4)
169
    trad_frame_set_reg_addr (this_cache, regnum, addr);
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171
  /* Construct the frame ID using the function start.  */
172
  trad_frame_set_id (this_cache, frame_id_build (base, func));
173
}
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175
static const struct tramp_frame m68kobsd_sigtramp = {
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  SIGTRAMP_FRAME,
177
  2,
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  {
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    { 0x206f, -1 }, { 0x000c, -1},      /* moveal %sp@(12),%a0 */
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    { 0x4e90, -1 },                     /* jsr %a0@ */
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    { 0x588f, -1 },                     /* addql #4,%sp */
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    { 0x4e41, -1 },                     /* trap #1 */
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    { 0x2f40, -1 }, { 0x0004, -1 },     /* moveal %d0,%sp@(4) */
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    { 0x7001, -1 },                     /* moveq #SYS_exit,%d0 */
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    { 0x4e40, -1 },                     /* trap #0 */
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    { TRAMP_SENTINEL_INSN, -1 }
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  },
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  m68kobsd_sigtramp_cache_init
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};
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static void
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m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
194
{
195
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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197
  tdep->jb_pc = 5;
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  tdep->jb_elt_size = 4;
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200
  set_gdbarch_decr_pc_after_break (gdbarch, 2);
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  set_gdbarch_regset_from_core_section
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    (gdbarch, m68kbsd_regset_from_core_section);
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}
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/* OpenBSD and NetBSD a.out.  */
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static void
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m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
211
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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213
  m68kbsd_init_abi (info, gdbarch);
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  tdep->struct_return = reg_struct_return;
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  tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp);
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}
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/* NetBSD ELF.  */
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static void
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m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
225
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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227
  m68kbsd_init_abi (info, gdbarch);
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  /* NetBSD ELF uses the SVR4 ABI.  */
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  m68k_svr4_init_abi (info, gdbarch);
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  tdep->struct_return = pcc_struct_return;
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  /* NetBSD ELF 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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}
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239
static enum gdb_osabi
240
m68kbsd_aout_osabi_sniffer (bfd *abfd)
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{
242
  if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
243
      || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
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    return GDB_OSABI_NETBSD_AOUT;
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246
  return GDB_OSABI_UNKNOWN;
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}
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249
static enum gdb_osabi
250
m68kbsd_core_osabi_sniffer (bfd *abfd)
251
{
252
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
253
    return GDB_OSABI_NETBSD_AOUT;
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255
  return GDB_OSABI_UNKNOWN;
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}
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259
/* Provide a prototype to silence -Wmissing-prototypes.  */
260
void _initialize_m68kbsd_tdep (void);
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262
void
263
_initialize_m68kbsd_tdep (void)
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{
265
  gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
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                                  m68kbsd_aout_osabi_sniffer);
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268
  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
269
  gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
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                                  m68kbsd_core_osabi_sniffer);
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272
  gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
273
                          m68kbsd_aout_init_abi);
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  gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
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                          m68kbsd_elf_init_abi);
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}

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