GDB (xrefs)
/tmp/gdb-7.10/gdb/core-regset.c
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1 /* Machine independent GDB support for core files on systems using "regsets".
2 
3  Copyright (C) 1993-2015 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 3 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, see <http://www.gnu.org/licenses/>. */
19 
20 /* This file is used by most systems that use ELF for their core
21  dumps. This includes most systems that have SVR4-ish variant of
22  /proc. For these systems, the registers are laid out the same way
23  in core files as in the gregset_t and fpregset_t structures that
24  are used in the interaction with /proc (Irix 4 is an exception and
25  therefore doesn't use this file). Quite a few systems without a
26  SVR4-ish /proc define these structures too, and can make use of
27  this code too. */
28 
29 #include "defs.h"
30 #include "command.h"
31 #include "gdbcore.h"
32 #include "inferior.h"
33 #include "target.h"
34 #include "regcache.h"
35 
36 #include <fcntl.h>
37 #include <time.h>
38 #ifdef HAVE_SYS_PROCFS_H
39 #include <sys/procfs.h>
40 #endif
41 
42 /* Prototypes for supply_gregset etc. */
43 #include "gregset.h"
44 
45 /* Provide registers to GDB from a core file.
46 
47  CORE_REG_SECT points to an array of bytes, which are the contents
48  of a `note' from a core file which BFD thinks might contain
49  register contents. CORE_REG_SIZE is its size.
50 
51  WHICH says which register set corelow suspects this is:
52  0 --- the general-purpose register set, in gregset_t format
53  2 --- the floating-point register set, in fpregset_t format
54 
55  REG_ADDR is ignored. */
56 
57 static void
59  char *core_reg_sect,
60  unsigned core_reg_size,
61  int which,
62  CORE_ADDR reg_addr)
63 {
64  gdb_gregset_t gregset;
65  gdb_fpregset_t fpregset;
66  gdb_gregset_t *gregset_p = &gregset;
67  gdb_fpregset_t *fpregset_p = &fpregset;
68 
69  switch (which)
70  {
71  case 0:
72  if (core_reg_size != sizeof (gregset))
73  warning (_("Wrong size gregset in core file."));
74  else
75  {
76  memcpy (&gregset, core_reg_sect, sizeof (gregset));
77  supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
78  }
79  break;
80 
81  case 2:
82  if (core_reg_size != sizeof (fpregset))
83  warning (_("Wrong size fpregset in core file."));
84  else
85  {
86  memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
87  if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) >= 0)
88  supply_fpregset (regcache,
89  (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 
105 static 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. */
115 extern void _initialize_core_regset (void);
116 
117 void
119 {
120  deprecated_add_core_fns (&regset_core_fns);
121 }
int default_check_format(bfd *abfd)
Definition: corelow.c:164
bfd_vma CORE_ADDR
Definition: common-types.h:41
struct gdbarch * get_regcache_arch(const struct regcache *regcache)
Definition: regcache.c:297
void warning(const char *fmt,...)
Definition: errors.c:26
#define _(String)
Definition: gdb_locale.h:40
GDB_GREGSET_T gdb_gregset_t
Definition: gregset.h:34
GDB_FPREGSET_T gdb_fpregset_t
Definition: gregset.h:35
void supply_gregset(struct regcache *regcache, const gdb_gregset_t *gregsetp)
void _initialize_core_regset(void)
Definition: core-regset.c:118
void deprecated_add_core_fns(struct core_fns *cf)
Definition: corelow.c:104
static void fetch_core_registers(struct regcache *regcache, char *core_reg_sect, unsigned core_reg_size, int which, CORE_ADDR reg_addr)
Definition: core-regset.c:58
int gdbarch_fp0_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:2032
int default_core_sniffer(struct core_fns *our_fns, bfd *abfd)
Definition: corelow.c:115
void supply_fpregset(struct regcache *regcache, const gdb_fpregset_t *fpregsetp)