gdb/coredep.c

   1 /* Extract registers from a "standard" core file, for GDB.
   2    Copyright (C) 1988-1991  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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* core.c is supposed to be the more machine-independent aspects of this;
  21    this file is more machine-specific.  */
  22
  23 #include "defs.h"
  24 #include "param.h"
  25 #include "gdbcore.h"
  26 #include <stdio.h>
  27
  28 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31 #ifndef USG
  32 #include <sys/dir.h>
  33 #include <sys/file.h>
  34 #include <sys/stat.h>
  35 #include <sys/user.h>
  36 #include <sys/ptrace.h>
  37 #endif
  38
  39
  40 /* Extract the register values out of the core file and store
  41    them where `read_register' will find them.
  42
  43    CORE_REG_SECT points to the register values themselves, read into memory.
  44    CORE_REG_SIZE is the size of that area.
  45    WHICH says which set of registers we are handling (0 = int, 2 = float
  46          on machines where they are discontiguous).
  47    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  48             core_reg_sect.  This is used with old-fashioned core files to
  49             locate the registers in a large upage-plus-stack ".reg" section.
  50             Original upage address X is at location core_reg_sect+x+reg_addr.
  51  */
  52
  53 void
  54 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  55      char *core_reg_sect;
  56      unsigned core_reg_size;
  57      int which;
  58      unsigned reg_addr;
  59 {
  60   register int regno;
  61   register unsigned int addr;
  62   int bad_reg = -1;
  63   register reg_ptr = -reg_addr;         /* Original u.u_ar0 is -reg_addr. */
  64
  65   /* If u.u_ar0 was an absolute address in the core file, relativize it now,
  66      so we can use it as an offset into core_reg_sect.  When we're done,
  67      "register 0" will be at core_reg_sect+reg_ptr, and we can use
  68      register_addr to offset to the other registers.  If this is a modern
  69      core file without a upage, reg_ptr will be zero and this is all a big
  70      NOP.  */
  71   if (reg_ptr > core_reg_size)
  72     reg_ptr -= KERNEL_U_ADDR;
  73   if (reg_ptr > core_reg_size)
  74     fprintf (stderr, "Can't find registers in core file\n");
  75
  76   for (regno = 0; regno < NUM_REGS; regno++)
  77     {
  78       addr = register_addr (regno, reg_ptr);
  79       if (addr >= core_reg_size) {
  80         if (bad_reg < 0)
  81           bad_reg = regno;
  82       } else {
  83         supply_register (regno, core_reg_sect + addr);
  84       }
  85     }
  86   if (bad_reg > 0)
  87     {
  88       error ("Register %s not found in core file.", reg_names[bad_reg]);
  89     }
  90 }
  91
  92
  93 #ifdef REGISTER_U_ADDR
  94
  95 /* Return the address in the core dump or inferior of register REGNO.
  96    BLOCKEND is the address of the end of the user structure.  */
  97
  98 unsigned int
  99 register_addr (regno, blockend)
 100      int regno;
 101      int blockend;
 102 {
 103   int addr;
 104
 105   if (regno < 0 || regno >= NUM_REGS)
 106     error ("Invalid register number %d.", regno);
 107
 108   REGISTER_U_ADDR (addr, blockend, regno);
 109
 110   return addr;
 111 }
 112
 113 #endif /* REGISTER_U_ADDR */