1/* Machine independent GDB support for core files on systems using "regsets".
2
3   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2003
4   Free Software Foundation, Inc.
5
6   This file is part of GDB.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place - Suite 330,
21   Boston, MA 02111-1307, USA.  */
22
23/* This file is used by most systems that use ELF for their core
24   dumps.  This includes most systems that have SVR4-ish variant of
25   /proc.  For these systems, the registers are laid out the same way
26   in core files as in the gregset_t and fpregset_t structures that
27   are used in the interaction with /proc (Irix 4 is an exception and
28   therefore doesn't use this file).  Quite a few systems without a
29   SVR4-ish /proc define these structures too, and can make use of
30   this code too.  */
31
32#include "defs.h"
33#include "command.h"
34#include "gdbcore.h"
35#include "inferior.h"
36#include "target.h"
37
38#include <fcntl.h>
39#include <errno.h>
40#include "gdb_string.h"
41#include <time.h>
42#ifdef HAVE_SYS_PROCFS_H
43#include <sys/procfs.h>
44#endif
45
46/* Prototypes for supply_gregset etc.  */
47#include "gregset.h"
48
49/* Provide registers to GDB from a core file.
50
51   CORE_REG_SECT points to an array of bytes, which are the contents
52   of a `note' from a core file which BFD thinks might contain
53   register contents.  CORE_REG_SIZE is its size.
54
55   WHICH says which register set corelow suspects this is:
56     0 --- the general-purpose register set, in gregset_t format
57     2 --- the floating-point register set, in fpregset_t format
58
59   REG_ADDR is ignored.  */
60
61static void
62fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
63		      CORE_ADDR reg_addr)
64{
65  gdb_gregset_t gregset;
66  gdb_fpregset_t fpregset;
67
68  switch (which)
69    {
70    case 0:
71      if (core_reg_size != sizeof (gregset))
72	warning ("Wrong size gregset in core file.");
73      else
74	{
75	  memcpy (&gregset, core_reg_sect, sizeof (gregset));
76	  supply_gregset (&gregset);
77	}
78      break;
79
80    case 2:
81      if (core_reg_size != sizeof (fpregset))
82	warning ("Wrong size fpregset in core file.");
83      else
84	{
85	  memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
86	  if (FP0_REGNUM >= 0)
87	    supply_fpregset (&fpregset);
88	}
89      break;
90
91    default:
92      /* We've covered all the kinds of registers we know about here,
93         so this must be something we wouldn't know what to do with
94         anyway.  Just ignore it.  */
95      break;
96    }
97}
98
99
100/* Register that we are able to handle ELF core file formats using
101   standard procfs "regset" structures.  */
102
103static struct core_fns regset_core_fns =
104{
105  bfd_target_elf_flavour,		/* core_flavour */
106  default_check_format,			/* check_format */
107  default_core_sniffer,			/* core_sniffer */
108  fetch_core_registers,			/* core_read_registers */
109  NULL					/* next */
110};
111
112/* Provide a prototype to silence -Wmissing-prototypes.  */
113extern void _initialize_core_regset (void);
114
115void
116_initialize_core_regset (void)
117{
118  add_core_fns (&regset_core_fns);
119}
120