1/* Machine independent GDB support for core files on systems using "regsets".
2
3   Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2003, 2007
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 3 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, see <http://www.gnu.org/licenses/>.  */
20
21/* This file is used by most systems that use ELF for their core
22   dumps.  This includes most systems that have SVR4-ish variant of
23   /proc.  For these systems, the registers are laid out the same way
24   in core files as in the gregset_t and fpregset_t structures that
25   are used in the interaction with /proc (Irix 4 is an exception and
26   therefore doesn't use this file).  Quite a few systems without a
27   SVR4-ish /proc define these structures too, and can make use of
28   this code too.  */
29
30#include "defs.h"
31#include "command.h"
32#include "gdbcore.h"
33#include "inferior.h"
34#include "target.h"
35#include "regcache.h"
36
37#include <fcntl.h>
38#include <errno.h>
39#include "gdb_string.h"
40#include <time.h>
41#ifdef HAVE_SYS_PROCFS_H
42#include <sys/procfs.h>
43#endif
44
45/* Prototypes for supply_gregset etc.  */
46#include "gregset.h"
47
48/* Provide registers to GDB from a core file.
49
50   CORE_REG_SECT points to an array of bytes, which are the contents
51   of a `note' from a core file which BFD thinks might contain
52   register contents.  CORE_REG_SIZE is its size.
53
54   WHICH says which register set corelow suspects this is:
55     0 --- the general-purpose register set, in gregset_t format
56     2 --- the floating-point register set, in fpregset_t format
57
58   REG_ADDR is ignored.  */
59
60static void
61fetch_core_registers (struct regcache *regcache,
62		      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  gdb_gregset_t *gregset_p = &gregset;
68  gdb_fpregset_t *fpregset_p = &fpregset;
69
70  switch (which)
71    {
72    case 0:
73      if (core_reg_size != sizeof (gregset))
74	warning (_("Wrong size gregset in core file."));
75      else
76	{
77	  memcpy (&gregset, core_reg_sect, sizeof (gregset));
78	  supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
79	}
80      break;
81
82    case 2:
83      if (core_reg_size != sizeof (fpregset))
84	warning (_("Wrong size fpregset in core file."));
85      else
86	{
87	  memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
88	  if (gdbarch_fp0_regnum (current_gdbarch) >= 0)
89	    supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset_p);
90	}
91      break;
92
93    default:
94      /* We've covered all the kinds of registers we know about here,
95         so this must be something we wouldn't know what to do with
96         anyway.  Just ignore it.  */
97      break;
98    }
99}
100
101
102/* Register that we are able to handle ELF core file formats using
103   standard procfs "regset" structures.  */
104
105static struct core_fns regset_core_fns =
106{
107  bfd_target_elf_flavour,		/* core_flavour */
108  default_check_format,			/* check_format */
109  default_core_sniffer,			/* core_sniffer */
110  fetch_core_registers,			/* core_read_registers */
111  NULL					/* next */
112};
113
114/* Provide a prototype to silence -Wmissing-prototypes.  */
115extern void _initialize_core_regset (void);
116
117void
118_initialize_core_regset (void)
119{
120  deprecated_add_core_fns (&regset_core_fns);
121}
122