gnu/dist/gdb6/gdb/core-aout.c

   1 /* Extract registers from a "standard" core file, for GDB.
   2    Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
   3    1999, 2000, 2001 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 /* Typically used on systems that have a.out format executables.
  23    corefile.c is supposed to contain the more machine-independent
  24    aspects of reading registers from core files, while this file is
  25    more machine specific.  */
  26
  27 #include "defs.h"
  28
  29 #ifdef HAVE_PTRACE_H
  30 #include <ptrace.h>
  31 #else
  32 #ifdef HAVE_SYS_PTRACE_H
  33 #include <sys/ptrace.h>
  34 #endif
  35 #endif
  36
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include "gdbcore.h"
  40 #include "value.h"
  41 #include "regcache.h"
  42
  43 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  44 #include "gdb_dirent.h"
  45 #include <sys/file.h>
  46 #include "gdb_stat.h"
  47 #include <sys/user.h>
  48
  49 #ifndef CORE_REGISTER_ADDR
  50 #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)
  51 #endif /* CORE_REGISTER_ADDR */
  52
  53 #ifdef NEED_SYS_CORE_H
  54 #include <sys/core.h>
  55 #endif
  56
  57 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
  58
  59 void _initialize_core_aout (void);
  60
  61 /* Extract the register values out of the core file and store
  62    them where `read_register' will find them.
  63
  64    CORE_REG_SECT points to the register values themselves, read into memory.
  65    CORE_REG_SIZE is the size of that area.
  66    WHICH says which set of registers we are handling (0 = int, 2 = float
  67    on machines where they are discontiguous).
  68    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  69    core_reg_sect.  This is used with old-fashioned core files to
  70    locate the registers in a large upage-plus-stack ".reg" section.
  71    Original upage address X is at location core_reg_sect+x+reg_addr.
  72  */
  73
  74 static void
  75 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
  76                       CORE_ADDR reg_addr)
  77 {
  78   int regno;
  79   CORE_ADDR addr;
  80   int bad_reg = -1;
  81   CORE_ADDR reg_ptr = -reg_addr;        /* Original u.u_ar0 is -reg_addr. */
  82   int numregs = NUM_REGS;
  83
  84   /* If u.u_ar0 was an absolute address in the core file, relativize it now,
  85      so we can use it as an offset into core_reg_sect.  When we're done,
  86      "register 0" will be at core_reg_sect+reg_ptr, and we can use
  87      CORE_REGISTER_ADDR to offset to the other registers.  If this is a modern
  88      core file without a upage, reg_ptr will be zero and this is all a big
  89      NOP.  */
  90   if (reg_ptr > core_reg_size)
  91     reg_ptr -= KERNEL_U_ADDR;
  92
  93   for (regno = 0; regno < numregs; regno++)
  94     {
  95       addr = CORE_REGISTER_ADDR (regno, reg_ptr);
  96       if (addr >= core_reg_size
  97           && bad_reg < 0)
  98         bad_reg = regno;
  99       else
 100         regcache_raw_supply (current_regcache, regno, core_reg_sect + addr);
 101     }
 102
 103   if (bad_reg >= 0)
 104     error (_("Register %s not found in core file."), REGISTER_NAME (bad_reg));
 105 }
 106
 107
 108 #ifdef REGISTER_U_ADDR
 109
 110 /* Return the address in the core dump or inferior of register REGNO.
 111    BLOCKEND is the address of the end of the user structure.  */
 112
 113 CORE_ADDR
 114 register_addr (int regno, CORE_ADDR blockend)
 115 {
 116   CORE_ADDR addr;
 117
 118   if (regno < 0 || regno >= NUM_REGS)
 119     error (_("Invalid register number %d."), regno);
 120
 121   REGISTER_U_ADDR (addr, blockend, regno);
 122
 123   return addr;
 124 }
 125
 126 #endif /* REGISTER_U_ADDR */
 127 \f
 128
 129 /* Register that we are able to handle aout (trad-core) file formats.  */
 130
 131 static struct core_fns aout_core_fns =
 132 {
 133   bfd_target_unknown_flavour,           /* core_flavour */
 134   default_check_format,                 /* check_format */
 135   default_core_sniffer,                 /* core_sniffer */
 136   fetch_core_registers,                 /* core_read_registers */
 137   NULL                                  /* next */
 138 };
 139
 140 void
 141 _initialize_core_aout (void)
 142 {
 143   deprecated_add_core_fns (&aout_core_fns);
 144 }