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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [core-aout.c] - Blame information for rev 1765

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1 104 markom
/* Extract registers from a "standard" core file, for GDB.
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   Copyright (C) 1988-1998  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 2 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, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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/* Typically used on systems that have a.out format executables.
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   corefile.c is supposed to contain the more machine-independent
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   aspects of reading registers from core files, while this file is
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   more machine specific.  */
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#include "defs.h"
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#ifdef HAVE_PTRACE_H
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#include <ptrace.h>
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#else
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#ifdef HAVE_SYS_PTRACE_H
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#include <sys/ptrace.h>
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#endif
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include "gdbcore.h"
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#include "value.h"              /* For supply_register.  */
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#include "inferior.h"           /* For ARCH_NUM_REGS. */
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/* These are needed on various systems to expand REGISTER_U_ADDR.  */
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#ifndef USG
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#include <sys/dir.h>
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#include <sys/file.h>
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#include "gdb_stat.h"
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#include <sys/user.h>
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#endif
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#ifndef CORE_REGISTER_ADDR
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#define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)
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#endif /* CORE_REGISTER_ADDR */
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#ifdef NEED_SYS_CORE_H
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#include <sys/core.h>
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#endif
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static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
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void _initialize_core_aout PARAMS ((void));
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/* Extract the register values out of the core file and store
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   them where `read_register' will find them.
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   CORE_REG_SECT points to the register values themselves, read into memory.
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   CORE_REG_SIZE is the size of that area.
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   WHICH says which set of registers we are handling (0 = int, 2 = float
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   on machines where they are discontiguous).
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   REG_ADDR is the offset from u.u_ar0 to the register values relative to
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   core_reg_sect.  This is used with old-fashioned core files to
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   locate the registers in a large upage-plus-stack ".reg" section.
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   Original upage address X is at location core_reg_sect+x+reg_addr.
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 */
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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     char *core_reg_sect;
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     unsigned core_reg_size;
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     int which;
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     CORE_ADDR reg_addr;
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{
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  int regno;
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  CORE_ADDR addr;
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  int bad_reg = -1;
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  CORE_ADDR reg_ptr = -reg_addr;        /* Original u.u_ar0 is -reg_addr. */
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  int numregs = ARCH_NUM_REGS;
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  /* If u.u_ar0 was an absolute address in the core file, relativize it now,
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     so we can use it as an offset into core_reg_sect.  When we're done,
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     "register 0" will be at core_reg_sect+reg_ptr, and we can use
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     CORE_REGISTER_ADDR to offset to the other registers.  If this is a modern
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     core file without a upage, reg_ptr will be zero and this is all a big
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     NOP.  */
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  if (reg_ptr > core_reg_size)
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    reg_ptr -= KERNEL_U_ADDR;
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  for (regno = 0; regno < numregs; regno++)
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    {
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      addr = CORE_REGISTER_ADDR (regno, reg_ptr);
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      if (addr >= core_reg_size
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          && bad_reg < 0)
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        bad_reg = regno;
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      else
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        supply_register (regno, core_reg_sect + addr);
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    }
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  if (bad_reg >= 0)
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    error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
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}
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#ifdef REGISTER_U_ADDR
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/* Return the address in the core dump or inferior of register REGNO.
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   BLOCKEND is the address of the end of the user structure.  */
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CORE_ADDR
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register_addr (regno, blockend)
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     int regno;
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     CORE_ADDR blockend;
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{
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  CORE_ADDR addr;
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  if (regno < 0 || regno >= ARCH_NUM_REGS)
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    error ("Invalid register number %d.", regno);
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  REGISTER_U_ADDR (addr, blockend, regno);
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  return addr;
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}
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#endif /* REGISTER_U_ADDR */
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/* Register that we are able to handle aout (trad-core) file formats.  */
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static struct core_fns aout_core_fns =
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{
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  bfd_target_unknown_flavour,           /* core_flavour */
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  default_check_format,                 /* check_format */
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  default_core_sniffer,                 /* core_sniffer */
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  fetch_core_registers,                 /* core_read_registers */
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  NULL                                  /* next */
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};
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void
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_initialize_core_aout ()
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{
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  add_core_fns (&aout_core_fns);
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}

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