gdb/core-aout.c

   1 /* Extract registers from a "standard" core file, for GDB.
   2    Copyright (C) 1988-1995  Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* Typically used on systems that have a.out format executables.
  21    corefile.c is supposed to contain the more machine-independent
  22    aspects of reading registers from core files, while this file is
  23    more machine specific.  */
  24
  25 #include "defs.h"
  26
  27 #ifdef HAVE_PTRACE_H
  28 # include <ptrace.h>
  29 #else
  30 # ifdef HAVE_SYS_PTRACE_H
  31 #  include <sys/ptrace.h>
  32 # endif
  33 #endif
  34
  35 #include <sys/types.h>
  36 #include <sys/param.h>
  37 #include "gdbcore.h"
  38 #include "value.h" /* For supply_register.  */
  39 #include "inferior.h" /* For ARCH_NUM_REGS. */
  40
  41 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  42 #ifndef USG
  43 #include <sys/dir.h>
  44 #include <sys/file.h>
  45 #include "gdb_stat.h"
  46 #include <sys/user.h>
  47 #endif
  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 PARAMS ((char *, unsigned, int, CORE_ADDR));
  58
  59 /* Extract the register values out of the core file and store
  60    them where `read_register' will find them.
  61
  62    CORE_REG_SECT points to the register values themselves, read into memory.
  63    CORE_REG_SIZE is the size of that area.
  64    WHICH says which set of registers we are handling (0 = int, 2 = float
  65          on machines where they are discontiguous).
  66    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  67             core_reg_sect.  This is used with old-fashioned core files to
  68             locate the registers in a large upage-plus-stack ".reg" section.
  69             Original upage address X is at location core_reg_sect+x+reg_addr.
  70  */
  71
  72 static void
  73 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  74      char *core_reg_sect;
  75      unsigned core_reg_size;
  76      int which;
  77      CORE_ADDR reg_addr;
  78 {
  79   int regno;
  80   CORE_ADDR addr;
  81   int bad_reg = -1;
  82   CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */
  83   int numregs = ARCH_NUM_REGS;
  84
  85   /* If u.u_ar0 was an absolute address in the core file, relativize it now,
  86      so we can use it as an offset into core_reg_sect.  When we're done,
  87      "register 0" will be at core_reg_sect+reg_ptr, and we can use
  88      CORE_REGISTER_ADDR to offset to the other registers.  If this is a modern
  89      core file without a upage, reg_ptr will be zero and this is all a big
  90      NOP.  */
  91   if (reg_ptr > core_reg_size)
  92     reg_ptr -= KERNEL_U_ADDR;
  93
  94   for (regno = 0; regno < numregs; regno++)
  95     {
  96       addr = CORE_REGISTER_ADDR (regno, reg_ptr);
  97       if (addr >= core_reg_size
  98           && bad_reg < 0)
  99         bad_reg = regno;
 100     else
 101       supply_register (regno, core_reg_sect + addr);
 102     }
 103
 104   if (bad_reg >= 0)
 105     error ("Register %s not found in core file.", reg_names[bad_reg]);
 106 }
 107
 108
 109 #ifdef REGISTER_U_ADDR
 110
 111 /* Return the address in the core dump or inferior of register REGNO.
 112    BLOCKEND is the address of the end of the user structure.  */
 113
 114 CORE_ADDR
 115 register_addr (regno, blockend)
 116      int regno;
 117      CORE_ADDR blockend;
 118 {
 119   CORE_ADDR addr;
 120
 121   if (regno < 0 || regno >= ARCH_NUM_REGS)
 122     error ("Invalid register number %d.", regno);
 123
 124   REGISTER_U_ADDR (addr, blockend, regno);
 125
 126   return addr;
 127 }
 128
 129 #endif /* REGISTER_U_ADDR */
 130
 131 \f
 132 /* Register that we are able to handle aout (trad-core) file formats.  */
 133
 134 static struct core_fns aout_core_fns =
 135 {
 136   bfd_target_unknown_flavour,
 137   fetch_core_registers,
 138   NULL
 139 };
 140
 141 void
 142 _initialize_core_aout ()
 143 {
 144   add_core_fns (&aout_core_fns);
 145 }