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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [mips64obsd-tdep.c] - Blame information for rev 857

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1 24 jeremybenn
/* Target-dependent code for OpenBSD/mips64.
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   Copyright (C) 2004, 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 "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 "gdb_assert.h"
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#include "gdb_string.h"
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#include "mips-tdep.h"
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#include "solib-svr4.h"
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#define MIPS64OBSD_NUM_REGS 73
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/* Core file support.  */
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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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mips64obsd_supply_gregset (const struct regset *regset,
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                           struct regcache *regcache, int regnum,
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                           const void *gregs, size_t len)
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{
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  const char *regs = gregs;
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  int i;
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  for (i = 0; i < MIPS64OBSD_NUM_REGS; 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 * 8);
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    }
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}
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/* OpenBSD/mips64 register set.  */
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static struct regset mips64obsd_gregset =
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{
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  NULL,
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  mips64obsd_supply_gregset
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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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mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,
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                                     const char *sect_name, size_t sect_size)
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{
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  if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8)
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    return &mips64obsd_gregset;
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  return NULL;
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}
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/* Signal trampolines.  */
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static void
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mips64obsd_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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  struct gdbarch *gdbarch = get_frame_arch (next_frame);
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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,
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                                     MIPS_SP_REGNUM
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                                     + gdbarch_num_regs (gdbarch));
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  sigcontext_addr = sp + 32;
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  /* PC.  */
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  regnum = mips_regnum (gdbarch)->pc;
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  trad_frame_set_reg_addr (cache,
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                           regnum + gdbarch_num_regs (gdbarch),
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                            sigcontext_addr + 16);
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  /* GPRs.  */
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  for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
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       regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
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    trad_frame_set_reg_addr (cache,
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                             regnum + gdbarch_num_regs (gdbarch),
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                             addr);
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  /* HI and LO.  */
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  regnum = mips_regnum (gdbarch)->lo;
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  trad_frame_set_reg_addr (cache,
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                           regnum + gdbarch_num_regs (gdbarch),
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                           sigcontext_addr + 280);
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  regnum = mips_regnum (gdbarch)->hi;
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  trad_frame_set_reg_addr (cache,
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                           regnum + gdbarch_num_regs (gdbarch),
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                           sigcontext_addr + 288);
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  /* TODO: Handle the floating-point registers.  */
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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 mips64obsd_sigframe =
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{
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  SIGTRAMP_FRAME,
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  MIPS_INSN32_SIZE,
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  {
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    { 0x67a40020, -1 },         /* daddiu  a0,sp,32 */
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    { 0x24020067, -1 },         /* li      v0,103 */
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    { 0x0000000c, -1 },         /* syscall */
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    { 0x0000000d, -1 },         /* break */
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    { TRAMP_SENTINEL_INSN, -1 }
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  },
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  mips64obsd_sigframe_init
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};
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static void
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mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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  /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
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     way GDB works, forces us to pretend we can handle them all.  */
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  set_gdbarch_regset_from_core_section
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    (gdbarch, mips64obsd_regset_from_core_section);
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  tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
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  /* OpenBSD/mips64 has SVR4-style shared libraries.  */
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  set_solib_svr4_fetch_link_map_offsets
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    (gdbarch, svr4_lp64_fetch_link_map_offsets);
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}
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/* Provide a prototype to silence -Wmissing-prototypes.  */
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void _initialize_mips64obsd_tdep (void);
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void
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_initialize_mips64obsd_tdep (void)
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{
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  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
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                          mips64obsd_init_abi);
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}

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