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 #include "inferior.h" /* For ARCH_NUM_REGS. */
  29
  30 /* These are needed on various systems to expand REGISTER_U_ADDR.  */
  31 #ifndef USG
  32 #include <sys/dir.h>
  33 #include <sys/file.h>
  34 #include <sys/stat.h>
  35 #include <sys/user.h>
  36 #ifndef NO_PTRACE_H
  37 # ifdef PTRACE_IN_WRONG_PLACE
  38 #  include <ptrace.h>
  39 # else /* !PTRACE_IN_WRONG_PLACE */
  40 #  include <sys/ptrace.h>
  41 # endif /* !PTRACE_IN_WRONG_PLACE */
  42 #endif /* NO_PTRACE_H */
  43 #endif
  44
  45 #ifndef CORE_REGISTER_ADDR
  46 #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)
  47 #endif /* CORE_REGISTER_ADDR */
  48
  49 #ifdef NEED_SYS_CORE_H
  50 #include <sys/core.h>
  51 #endif
  52
  53 /* Extract the register values out of the core file and store
  54    them where `read_register' will find them.
  55
  56    CORE_REG_SECT points to the register values themselves, read into memory.
  57    CORE_REG_SIZE is the size of that area.
  58    WHICH says which set of registers we are handling (0 = int, 2 = float
  59          on machines where they are discontiguous).
  60    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  61             core_reg_sect.  This is used with old-fashioned core files to
  62             locate the registers in a large upage-plus-stack ".reg" section.
  63             Original upage address X is at location core_reg_sect+x+reg_addr.
  64  */
  65
  66 void
  67 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  68      char *core_reg_sect;
  69      unsigned core_reg_size;
  70      int which;
  71      unsigned reg_addr;
  72 {
  73   register int regno;
  74   register unsigned int addr;
  75   int bad_reg = -1;
  76   register reg_ptr = -reg_addr;         /* Original u.u_ar0 is -reg_addr. */
  77   int numregs = ARCH_NUM_REGS;
  78
  79   /* If u.u_ar0 was an absolute address in the core file, relativize it now,
  80      so we can use it as an offset into core_reg_sect.  When we're done,
  81      "register 0" will be at core_reg_sect+reg_ptr, and we can use
  82      CORE_REGISTER_ADDR to offset to the other registers.  If this is a modern
  83      core file without a upage, reg_ptr will be zero and this is all a big
  84      NOP.  */
  85   if (reg_ptr > core_reg_size)
  86     reg_ptr -= KERNEL_U_ADDR;
  87
  88   for (regno = 0; regno < numregs; regno++)
  89     {
  90       addr = CORE_REGISTER_ADDR (regno, reg_ptr);
  91       if (addr >= core_reg_size) {
  92         if (bad_reg < 0)
  93           bad_reg = regno;
  94       } else {
  95         supply_register (regno, core_reg_sect + addr);
  96       }
  97     }
  98   if (bad_reg >= 0)
  99     {
 100       error ("Register %s not found in core file.", reg_names[bad_reg]);
 101     }
 102 }
 103
 104
 105 #ifdef REGISTER_U_ADDR
 106
 107 /* Return the address in the core dump or inferior of register REGNO.
 108    BLOCKEND is the address of the end of the user structure.  */
 109
 110 unsigned int
 111 register_addr (regno, blockend)
 112      int regno;
 113      int blockend;
 114 {
 115   int addr;
 116
 117   if (regno < 0 || regno >= ARCH_NUM_REGS)
 118     error ("Invalid register number %d.", regno);
 119
 120   REGISTER_U_ADDR (addr, blockend, regno);
 121
 122   return addr;
 123 }
 124
 125 #endif /* REGISTER_U_ADDR */