gdb/core-aout.c

   1 /* Extract registers from a "standard" core file, for GDB.
   2    Copyright 1988-1998, 2001 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 #include "regcache.h"
  42
  43 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  44 #ifndef USG
  45 #include "gdb_dirent.h"
  46 #include <sys/file.h>
  47 #include "gdb_stat.h"
  48 #include <sys/user.h>
  49 #endif
  50
  51 #ifndef CORE_REGISTER_ADDR
  52 #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)
  53 #endif /* CORE_REGISTER_ADDR */
  54
  55 #ifdef NEED_SYS_CORE_H
  56 #include <sys/core.h>
  57 #endif
  58
  59 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
  60
  61 void _initialize_core_aout (void);
  62
  63 /* Extract the register values out of the core file and store
  64    them where `read_register' will find them.
  65
  66    CORE_REG_SECT points to the register values themselves, read into memory.
  67    CORE_REG_SIZE is the size of that area.
  68    WHICH says which set of registers we are handling (0 = int, 2 = float
  69    on machines where they are discontiguous).
  70    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  71    core_reg_sect.  This is used with old-fashioned core files to
  72    locate the registers in a large upage-plus-stack ".reg" section.
  73    Original upage address X is at location core_reg_sect+x+reg_addr.
  74  */
  75
  76 static void
  77 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
  78                       CORE_ADDR reg_addr)
  79 {
  80   int regno;
  81   CORE_ADDR addr;
  82   int bad_reg = -1;
  83   CORE_ADDR reg_ptr = -reg_addr;        /* Original u.u_ar0 is -reg_addr. */
  84   int numregs = ARCH_NUM_REGS;
  85
  86   /* If u.u_ar0 was an absolute address in the core file, relativize it now,
  87      so we can use it as an offset into core_reg_sect.  When we're done,
  88      "register 0" will be at core_reg_sect+reg_ptr, and we can use
  89      CORE_REGISTER_ADDR to offset to the other registers.  If this is a modern
  90      core file without a upage, reg_ptr will be zero and this is all a big
  91      NOP.  */
  92   if (reg_ptr > core_reg_size)
  93     reg_ptr -= KERNEL_U_ADDR;
  94
  95   for (regno = 0; regno < numregs; regno++)
  96     {
  97       addr = CORE_REGISTER_ADDR (regno, reg_ptr);
  98       if (addr >= core_reg_size
  99           && bad_reg < 0)
 100         bad_reg = regno;
 101       else
 102         supply_register (regno, core_reg_sect + addr);
 103     }
 104
 105   if (bad_reg >= 0)
 106     error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
 107 }
 108
 109
 110 #ifdef REGISTER_U_ADDR
 111
 112 /* Return the address in the core dump or inferior of register REGNO.
 113    BLOCKEND is the address of the end of the user structure.  */
 114
 115 CORE_ADDR
 116 register_addr (int regno, CORE_ADDR blockend)
 117 {
 118   CORE_ADDR addr;
 119
 120   if (regno < 0 || regno >= ARCH_NUM_REGS)
 121     error ("Invalid register number %d.", regno);
 122
 123   REGISTER_U_ADDR (addr, blockend, regno);
 124
 125   return addr;
 126 }
 127
 128 #endif /* REGISTER_U_ADDR */
 129 \f
 130
 131 /* Register that we are able to handle aout (trad-core) file formats.  */
 132
 133 static struct core_fns aout_core_fns =
 134 {
 135   bfd_target_unknown_flavour,           /* core_flavour */
 136   default_check_format,                 /* check_format */
 137   default_core_sniffer,                 /* core_sniffer */
 138   fetch_core_registers,                 /* core_read_registers */
 139   NULL                                  /* next */
 140 };
 141
 142 void
 143 _initialize_core_aout (void)
 144 {
 145   add_core_fns (&aout_core_fns);
 146 }