gdb/core-aout.c

   1 /* Extract registers from a "standard" core file, for GDB.
   2    Copyright (C) 1988-1998  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,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 /* Typically used on systems that have a.out format executables.
  22    corefile.c is supposed to contain the more machine-independent
  23    aspects of reading registers from core files, while this file is
  24    more machine specific.  */
  25
  26 #include "defs.h"
  27
  28 #ifdef HAVE_PTRACE_H
  29 #include <ptrace.h>
  30 #else
  31 #ifdef HAVE_SYS_PTRACE_H
  32 #include <sys/ptrace.h>
  33 #endif
  34 #endif
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include "gdbcore.h"
  39 #include "value.h"              /* For supply_register.  */
  40 #include "inferior.h"           /* For ARCH_NUM_REGS. */
  41
  42 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  43 #ifndef USG
  44 #include "gdb_dirent.h"
  45 #include <sys/file.h>
  46 #include "gdb_stat.h"
  47 #include <sys/user.h>
  48 #endif
  49
  50 #ifndef CORE_REGISTER_ADDR
  51 #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)
  52 #endif /* CORE_REGISTER_ADDR */
  53
  54 #ifdef NEED_SYS_CORE_H
  55 #include <sys/core.h>
  56 #endif
  57
  58 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
  59
  60 void _initialize_core_aout (void);
  61
  62 /* Extract the register values out of the core file and store
  63    them where `read_register' will find them.
  64
  65    CORE_REG_SECT points to the register values themselves, read into memory.
  66    CORE_REG_SIZE is the size of that area.
  67    WHICH says which set of registers we are handling (0 = int, 2 = float
  68    on machines where they are discontiguous).
  69    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  70    core_reg_sect.  This is used with old-fashioned core files to
  71    locate the registers in a large upage-plus-stack ".reg" section.
  72    Original upage address X is at location core_reg_sect+x+reg_addr.
  73  */
  74
  75 static void
  76 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, 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.", REGISTER_NAME (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 (int regno, CORE_ADDR blockend)
 116 {
 117   CORE_ADDR addr;
 118
 119   if (regno < 0 || regno >= ARCH_NUM_REGS)
 120     error ("Invalid register number %d.", regno);
 121
 122   REGISTER_U_ADDR (addr, blockend, regno);
 123
 124   return addr;
 125 }
 126
 127 #endif /* REGISTER_U_ADDR */
 128 \f
 129
 130 /* Register that we are able to handle aout (trad-core) file formats.  */
 131
 132 static struct core_fns aout_core_fns =
 133 {
 134   bfd_target_unknown_flavour,           /* core_flavour */
 135   default_check_format,                 /* check_format */
 136   default_core_sniffer,                 /* core_sniffer */
 137   fetch_core_registers,                 /* core_read_registers */
 138   NULL                                  /* next */
 139 };
 140
 141 void
 142 _initialize_core_aout (void)
 143 {
 144   add_core_fns (&aout_core_fns);
 145 }