1/* Extract registers from a "standard" core file, for GDB.
2   Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
3   1999, 2000, 2001 Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22/* Typically used on systems that have a.out format executables.
23   corefile.c is supposed to contain the more machine-independent
24   aspects of reading registers from core files, while this file is
25   more machine specific.  */
26
27#include "defs.h"
28
29#ifdef HAVE_PTRACE_H
30#include <ptrace.h>
31#else
32#ifdef HAVE_SYS_PTRACE_H
33#include <sys/ptrace.h>
34#endif
35#endif
36
37#include <sys/types.h>
38#include <sys/param.h>
39#include "gdbcore.h"
40#include "value.h"		/* For supply_register.  */
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
59static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
60
61void _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
76static void
77fetch_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 = 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
115CORE_ADDR
116register_addr (int regno, CORE_ADDR blockend)
117{
118  CORE_ADDR addr;
119
120  if (regno < 0 || regno >= 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
130
131/* Register that we are able to handle aout (trad-core) file formats.  */
132
133static 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
142void
143_initialize_core_aout (void)
144{
145  add_core_fns (&aout_core_fns);
146}
147