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1 /* Machine independent GDB support for core files on systems using "regsets".
2
3 Copyright (C) 1993-2016 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
58 fetch_core_registers (struct regcache *regcache,
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 \f
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
118 _initialize_core_regset (void)
119 {
120 deprecated_add_core_fns (&regset_core_fns);
121 }