1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/* Native support for Sun 386i's for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1992, 2001 Free Software
Foundation, Inc.
Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
C2V Paris, April 89.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <sys/file.h>
#include "gdb_stat.h"
#include <sys/core.h>
/* Machine-dependent code which would otherwise be in corefile.c */
/* Work with core files, for GDB. */
void
core_file_command (char *filename, int from_tty)
{
int val;
/* Discard all vestiges of any previous core file
and mark data and stack spaces as empty. */
if (corefile)
xfree (corefile);
corefile = 0;
if (corechan >= 0)
close (corechan);
corechan = -1;
data_start = 0;
data_end = 0;
stack_start = STACK_END_ADDR;
stack_end = STACK_END_ADDR;
/* Now, if a new core file was specified, open it and digest it. */
if (filename)
{
filename = tilde_expand (filename);
make_cleanup (xfree, filename);
if (have_inferior_p ())
error ("To look at a core file, you must kill the program with \"kill\".");
corechan = open (filename, O_RDONLY, 0);
if (corechan < 0)
perror_with_name (filename);
{
struct core corestr;
val = myread (corechan, &corestr, sizeof corestr);
if (val < 0)
perror_with_name (filename);
if (corestr.c_magic != CORE_MAGIC)
error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
filename, corestr.c_magic, (int) CORE_MAGIC);
else if (sizeof (struct core) != corestr.c_len)
error ("\"%s\" has an invalid struct core length (%d, expected %d)",
filename, corestr.c_len, (int) sizeof (struct core));
data_start = exec_data_start;
data_end = data_start + corestr.c_dsize;
stack_start = stack_end - corestr.c_ssize;
data_offset = sizeof corestr;
stack_offset = sizeof corestr + corestr.c_dsize;
memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
corestr.c_fpu.f_fpstatus.f_st,
sizeof corestr.c_fpu.f_fpstatus.f_st);
memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
&corestr.c_fpu.f_fpstatus.f_ctrl,
sizeof corestr.c_fpu.f_fpstatus -
sizeof corestr.c_fpu.f_fpstatus.f_st);
/* the struct aouthdr of sun coff is not the struct exec stored
in the core file. */
memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
#ifndef COFF_ENCAPSULATE
core_aouthdr.magic = corestr.c_aouthdr.a_info;
core_aouthdr.vstamp = /*SUNVERSION */ 31252;
#endif
printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);
if (corestr.c_signo > 0)
printf_unfiltered ("Program terminated with signal %d, %s.\n",
corestr.c_signo, safe_strsignal (corestr.c_signo));
}
if (filename[0] == '/')
corefile = savestring (filename, strlen (filename));
else
{
corefile = concat (current_directory, "/", filename, NULL);
}
flush_cached_frames ();
select_frame (get_current_frame (), 0);
validate_files ();
}
else if (from_tty)
printf_unfiltered ("No core file now.\n");
}
i387_to_double (char *from, char *to)
{
long *lp;
/* push extended mode on 387 stack, then pop in double mode
* first, set exception masks so no error is generated -
* number will be rounded to inf or 0, if necessary
*/
asm ("pushl %eax"); /* grab a stack slot */
asm ("fstcw (%esp)"); /* get 387 control word */
asm ("movl (%esp),%eax"); /* save old value */
asm ("orl $0x3f,%eax"); /* mask all exceptions */
asm ("pushl %eax");
asm ("fldcw (%esp)"); /* load new value into 387 */
asm ("movl 8(%ebp),%eax");
asm ("fldt (%eax)"); /* push extended number on 387 stack */
asm ("fwait");
asm ("movl 12(%ebp),%eax");
asm ("fstpl (%eax)"); /* pop double */
asm ("fwait");
asm ("popl %eax"); /* flush modified control word */
asm ("fnclex"); /* clear exceptions */
asm ("fldcw (%esp)"); /* restore original control word */
asm ("popl %eax"); /* flush saved copy */
}
double_to_i387 (char *from, char *to)
{
/* push double mode on 387 stack, then pop in extended mode
* no errors are possible because every 64-bit pattern
* can be converted to an extended
*/
asm ("movl 8(%ebp),%eax");
asm ("fldl (%eax)");
asm ("fwait");
asm ("movl 12(%ebp),%eax");
asm ("fstpt (%eax)");
asm ("fwait");
}
void
fetch_inferior_registers (int regno)
{
struct regs inferior_registers;
struct fp_state inferior_fp_registers;
registers_fetched ();
ptrace (PTRACE_GETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) & inferior_registers);
ptrace (PTRACE_GETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) & inferior_fp_registers);
memcpy (registers, &inferior_registers, sizeof inferior_registers);
memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st,
sizeof inferior_fp_registers.f_st);
memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
&inferior_fp_registers.f_ctrl,
sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
}
/* Store our register values back into the inferior.
If REGNO is -1, do this for all registers.
Otherwise, REGNO specifies which register (so we can save time). */
void
store_inferior_registers (int regno)
{
struct regs inferior_registers;
struct fp_state inferior_fp_registers;
memcpy (&inferior_registers, registers, 20 * 4);
memcpy (inferior_fp_registers.f_st,
®isters[REGISTER_BYTE (FP0_REGNUM)],
sizeof inferior_fp_registers.f_st);
memcpy (&inferior_fp_registers.f_ctrl,
®isters[REGISTER_BYTE (FPC_REGNUM)],
sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
#ifdef PTRACE_FP_BUG
if (regno == FP_REGNUM || regno == -1)
/* Storing the frame pointer requires a gross hack, in which an
instruction that moves eax into ebp gets single-stepped. */
{
int stack = inferior_registers.r_reg[SP_REGNUM];
int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
(PTRACE_ARG3_TYPE) stack);
int reg = inferior_registers.r_reg[EAX];
inferior_registers.r_reg[EAX] =
inferior_registers.r_reg[FP_REGNUM];
ptrace (PTRACE_SETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) & inferior_registers);
ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
0xc589);
ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
0);
wait (0);
ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
stuff);
inferior_registers.r_reg[EAX] = reg;
}
#endif
ptrace (PTRACE_SETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) & inferior_registers);
ptrace (PTRACE_SETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) & inferior_fp_registers);
}
|
