core-regset.c revision 46289 
1/* Machine independent GDB support for core files on systems using "regsets".
2   Copyright 1993-1998 Free Software Foundation, Inc.
3
4This file is part of GDB.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
19
20
21/*			N  O  T  E  S
22
23This file is used by most systems that implement /proc.  For these systems,
24the general registers are laid out the same way in both the core file and
25the gregset_p structure.  The current exception to this is Irix-4.*, where
26the gregset_p structure is split up into two pieces in the core file.
27
28The general register and floating point register sets are manipulated by
29separate ioctl's.  This file makes the assumption that if FP0_REGNUM is
30defined, then support for the floating point register set is desired,
31regardless of whether or not the actual target has floating point hardware.
32
33 */
34
35#include "defs.h"
36
37#include <time.h>
38#ifdef HAVE_SYS_PROCFS_H
39#include <sys/procfs.h>
40#endif
41#include <fcntl.h>
42#include <errno.h>
43#include "gdb_string.h"
44
45#include "inferior.h"
46#include "target.h"
47#include "command.h"
48#include "gdbcore.h"
49
50static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
51
52void _initialize_core_regset PARAMS ((void));
53
54/*
55
56GLOBAL FUNCTION
57
58	fetch_core_registers -- fetch current registers from core file
59
60SYNOPSIS
61
62	void fetch_core_registers (char *core_reg_sect,
63					  unsigned core_reg_size,
64					  int which, CORE_ADDR reg_addr)
65
66DESCRIPTION
67
68	Read the values of either the general register set (WHICH equals 0)
69	or the floating point register set (WHICH equals 2) from the core
70	file data (pointed to by CORE_REG_SECT), and update gdb's idea of
71	their current values.  The CORE_REG_SIZE parameter is ignored.
72
73NOTES
74
75	Use the indicated sizes to validate the gregset and fpregset
76	structures.
77*/
78
79static void
80fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
81     char *core_reg_sect;
82     unsigned core_reg_size;
83     int which;
84     CORE_ADDR reg_addr;	/* Unused in this version */
85{
86#if defined (HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T)
87  gregset_t gregset;
88  fpregset_t fpregset;
89
90  if (which == 0)
91    {
92      if (core_reg_size != sizeof (gregset))
93	{
94	  warning ("wrong size gregset struct in core file");
95	}
96      else
97	{
98	  memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
99	  supply_gregset (&gregset);
100	}
101    }
102  else if (which == 2)
103    {
104      if (core_reg_size != sizeof (fpregset))
105	{
106	  warning ("wrong size fpregset struct in core file");
107	}
108      else
109	{
110	  memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
111#if defined (FP0_REGNUM)
112	  supply_fpregset (&fpregset);
113#endif
114	}
115    }
116#endif	/* defined(HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T) */
117}
118
119
120/* Register that we are able to handle ELF file formats using standard
121   procfs "regset" structures.  */
122
123static struct core_fns regset_core_fns =
124{
125  bfd_target_elf_flavour,
126  fetch_core_registers,
127  NULL
128};
129
130void
131_initialize_core_regset ()
132{
133  add_core_fns (&regset_core_fns);
134}
135