core-regset.c revision 98948 
1/* Machine independent GDB support for core files on systems using "regsets".
2   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000
3   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
23/*                      N  O  T  E  S
24
25   This file is used by most systems that implement /proc.  For these systems,
26   the general registers are laid out the same way in both the core file and
27   the gregset_p structure.  The current exception to this is Irix-4.*, where
28   the gregset_p structure is split up into two pieces in the core file.
29
30   The general register and floating point register sets are manipulated by
31   separate ioctl's.  This file makes the assumption that if FP0_REGNUM is
32   defined, then support for the floating point register set is desired,
33   regardless of whether or not the actual target has floating point hardware.
34
35 */
36
37#include "defs.h"
38
39#include <time.h>
40#ifdef HAVE_SYS_PROCFS_H
41#include <sys/procfs.h>
42#endif
43#include <fcntl.h>
44#include <errno.h>
45#include "gdb_string.h"
46
47#include "inferior.h"
48#include "target.h"
49#include "command.h"
50#include "gdbcore.h"
51
52/* Prototypes for supply_gregset etc. */
53#include "gregset.h"
54
55static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
56
57void _initialize_core_regset (void);
58
59/*
60
61   GLOBAL FUNCTION
62
63   fetch_core_registers -- fetch current registers from core file
64
65   SYNOPSIS
66
67   void fetch_core_registers (char *core_reg_sect,
68   unsigned core_reg_size,
69   int which, CORE_ADDR reg_addr)
70
71   DESCRIPTION
72
73   Read the values of either the general register set (WHICH equals 0)
74   or the floating point register set (WHICH equals 2) from the core
75   file data (pointed to by CORE_REG_SECT), and update gdb's idea of
76   their current values.  The CORE_REG_SIZE parameter is compared to
77   the size of the gregset or fpgregset structures (as appropriate) to
78   validate the size of the structure from the core file.  The
79   REG_ADDR parameter is ignored.
80
81 */
82
83static void
84fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
85		      CORE_ADDR reg_addr)
86{
87  gdb_gregset_t gregset;
88  gdb_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 (FP0_REGNUM >= 0)
112	    supply_fpregset (&fpregset);
113	}
114    }
115}
116
117
118/* Register that we are able to handle ELF file formats using standard
119   procfs "regset" structures.  */
120
121static struct core_fns regset_core_fns =
122{
123  bfd_target_elf_flavour,		/* core_flavour */
124  default_check_format,			/* check_format */
125  default_core_sniffer,			/* core_sniffer */
126  fetch_core_registers,			/* core_read_registers */
127  NULL					/* next */
128};
129
130void
131_initialize_core_regset (void)
132{
133  add_core_fns (&regset_core_fns);
134}
135