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 <sys/types.h>
  25 #include <sys/param.h>
  26 #include "gdbcore.h"
  27 #include "value.h" /* For supply_register.  */
  28
  29 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  30 #ifndef USG
  31 #include <sys/dir.h>
  32 #include <sys/file.h>
  33 #include <sys/stat.h>
  34 #include <sys/user.h>
  35 #ifndef NO_PTRACE_H
  36 # ifdef PTRACE_IN_WRONG_PLACE
  37 #  include <ptrace.h>
  38 # else /* !PTRACE_IN_WRONG_PLACE */
  39 #  include <sys/ptrace.h>
  40 # endif /* !PTRACE_IN_WRONG_PLACE */
  41 #endif /* NO_PTRACE_H */
  42 #endif
  43
  44 #ifdef NEED_SYS_CORE_H
  45 #include <sys/core.h>
  46 #endif
  47
  48 /* Extract the register values out of the core file and store
  49    them where `read_register' will find them.
  50
  51    CORE_REG_SECT points to the register values themselves, read into memory.
  52    CORE_REG_SIZE is the size of that area.
  53    WHICH says which set of registers we are handling (0 = int, 2 = float
  54          on machines where they are discontiguous).
  55    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  56             core_reg_sect.  This is used with old-fashioned core files to
  57             locate the registers in a large upage-plus-stack ".reg" section.
  58             Original upage address X is at location core_reg_sect+x+reg_addr.
  59  */
  60
  61 void
  62 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  63      char *core_reg_sect;
  64      unsigned core_reg_size;
  65      int which;
  66      unsigned reg_addr;
  67 {
  68   register int regno;
  69   register unsigned int addr;
  70   int bad_reg = -1;
  71   register reg_ptr = -reg_addr;         /* Original u.u_ar0 is -reg_addr. */
  72
  73   /* If u.u_ar0 was an absolute address in the core file, relativize it now,
  74      so we can use it as an offset into core_reg_sect.  When we're done,
  75      "register 0" will be at core_reg_sect+reg_ptr, and we can use
  76      register_addr to offset to the other registers.  If this is a modern
  77      core file without a upage, reg_ptr will be zero and this is all a big
  78      NOP.  */
  79   if (reg_ptr > core_reg_size)
  80     reg_ptr -= KERNEL_U_ADDR;
  81
  82   for (regno = 0; regno < NUM_REGS; regno++)
  83     {
  84       addr = register_addr (regno, reg_ptr);
  85       if (addr >= core_reg_size) {
  86         if (bad_reg < 0)
  87           bad_reg = regno;
  88       } else {
  89         supply_register (regno, core_reg_sect + addr);
  90       }
  91     }
  92   if (bad_reg >= 0)
  93     {
  94       error ("Register %s not found in core file.", reg_names[bad_reg]);
  95     }
  96 }
  97
  98
  99 #ifdef REGISTER_U_ADDR
 100
 101 /* Return the address in the core dump or inferior of register REGNO.
 102    BLOCKEND is the address of the end of the user structure.  */
 103
 104 unsigned int
 105 register_addr (regno, blockend)
 106      int regno;
 107      int blockend;
 108 {
 109   int addr;
 110
 111   if (regno < 0 || regno >= NUM_REGS)
 112     error ("Invalid register number %d.", regno);
 113
 114   REGISTER_U_ADDR (addr, blockend, regno);
 115
 116   return addr;
 117 }
 118
 119 #endif /* REGISTER_U_ADDR */