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/* Extract registers from a "standard" core file, for GDB.

   Copyright (C) 1988-1998  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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

/* Typically used on systems that have a.out format executables.

   corefile.c is supposed to contain the more machine-independent

   aspects of reading registers from core files, while this file is

   more machine specific.  */

#include "defs.h"

#ifdef HAVE_PTRACE_H

#include <ptrace.h>

#else

#ifdef HAVE_SYS_PTRACE_H

#include <sys/ptrace.h>

#endif

#endif

#include <sys/types.h>

#include <sys/param.h>

#include "gdbcore.h"

#include "value.h"              /* For supply_register.  */

#include "inferior.h"           /* For ARCH_NUM_REGS. */

/* These are needed on various systems to expand REGISTER_U_ADDR.  */

#ifndef USG

#include <sys/dir.h>

#include <sys/file.h>

#include "gdb_stat.h"

#include <sys/user.h>

#endif

#ifndef CORE_REGISTER_ADDR

#define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)

#endif /* CORE_REGISTER_ADDR */

#ifdef NEED_SYS_CORE_H

#include <sys/core.h>

#endif

static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));

void _initialize_core_aout PARAMS ((void));

/* Extract the register values out of the core file and store

   them where `read_register' will find them.

   CORE_REG_SECT points to the register values themselves, read into memory.

   CORE_REG_SIZE is the size of that area.

   WHICH says which set of registers we are handling (0 = int, 2 = float

   on machines where they are discontiguous).

   REG_ADDR is the offset from u.u_ar0 to the register values relative to

   core_reg_sect.  This is used with old-fashioned core files to

   locate the registers in a large upage-plus-stack ".reg" section.

   Original upage address X is at location core_reg_sect+x+reg_addr.

 */

static void

fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)

     char *core_reg_sect;

     unsigned core_reg_size;

     int which;

     CORE_ADDR reg_addr;

{

  int regno;

  CORE_ADDR addr;

  int bad_reg = -1;

  CORE_ADDR reg_ptr = -reg_addr;        /* Original u.u_ar0 is -reg_addr. */

  int numregs = ARCH_NUM_REGS;

  /* If u.u_ar0 was an absolute address in the core file, relativize it now,

     so we can use it as an offset into core_reg_sect.  When we're done,

     "register 0" will be at core_reg_sect+reg_ptr, and we can use

     CORE_REGISTER_ADDR to offset to the other registers.  If this is a modern

     core file without a upage, reg_ptr will be zero and this is all a big

     NOP.  */

  if (reg_ptr > core_reg_size)

    reg_ptr -= KERNEL_U_ADDR;

  for (regno = 0; regno < numregs; regno++)

    {

      addr = CORE_REGISTER_ADDR (regno, reg_ptr);

      if (addr >= core_reg_size

          && bad_reg < 0)

        bad_reg = regno;

      else

        supply_register (regno, core_reg_sect + addr);

    }

  if (bad_reg >= 0)

    error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));

}

#ifdef REGISTER_U_ADDR

/* Return the address in the core dump or inferior of register REGNO.

   BLOCKEND is the address of the end of the user structure.  */

CORE_ADDR

register_addr (regno, blockend)

     int regno;

     CORE_ADDR blockend;

{

  CORE_ADDR addr;

  if (regno < 0 || regno >= ARCH_NUM_REGS)

    error ("Invalid register number %d.", regno);

  REGISTER_U_ADDR (addr, blockend, regno);

  return addr;

}

#endif /* REGISTER_U_ADDR */

/* Register that we are able to handle aout (trad-core) file formats.  */

static struct core_fns aout_core_fns =

{

  bfd_target_unknown_flavour,           /* core_flavour */

  default_check_format,                 /* check_format */

  default_core_sniffer,                 /* core_sniffer */

  fetch_core_registers,                 /* core_read_registers */

  NULL                                  /* next */

};

void

_initialize_core_aout ()

{

  add_core_fns (&aout_core_fns);

}