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
|
/* Low level interface to ptrace, for GDB when running under m68k SVR2 Unix
on Altos 3068. Report bugs to Jyrki Kuoppala <jkp@cs.hut.fi>
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#ifdef USG
#include <sys/types.h>
#endif
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#ifdef USG
#include <sys/page.h>
#ifdef ALTOS
#include <sys/net.h>
#include <errno.h>
#endif
#endif
#include "gdbcore.h"
#include <sys/user.h> /* After a.out.h */
#include <sys/file.h>
#include "gdb_stat.h"
/* Work with core dump and executable files, for GDB.
This code would be in core.c if it weren't machine-dependent. */
void
core_file_command (filename, from_tty)
char *filename;
int from_tty;
{
int val;
extern char registers[];
/* Discard all vestiges of any previous core file
and mark data and stack spaces as empty. */
if (corefile)
free (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 (free, 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);
/* 4.2-style (and perhaps also sysV-style) core dump file. */
{
struct user u;
unsigned int reg_offset;
val = myread (corechan, &u, sizeof u);
if (val < 0)
perror_with_name ("Not a core file: reading upage");
if (val != sizeof u)
error ("Not a core file: could only read %d bytes", val);
data_start = exec_data_start;
#if !defined (NBPG)
#define NBPG NBPP
#endif
#if !defined (UPAGES)
#define UPAGES USIZE
#endif
data_end = data_start + NBPG * u.u_dsize;
stack_start = stack_end - NBPG * u.u_ssize;
data_offset = NBPG * UPAGES + exec_data_start % NBPG /* Not sure about this //jkp */;
stack_offset = NBPG * (UPAGES + u.u_dsize);
/* Some machines put an absolute address in here and some put
the offset in the upage of the regs. */
reg_offset = (int) u.u_state;
if (reg_offset > NBPG * UPAGES)
reg_offset -= KERNEL_U_ADDR;
memcpy (&core_aouthdr, &u.u_exdata, sizeof (AOUTHDR));
printf_unfiltered ("Core file is from \"%s\".\n", u.u_comm);
/* I don't know where to find this info.
So, for now, mark it as not available. */
N_SET_MAGIC (core_aouthdr, 0);
/* Read the register values out of the core file and store
them where `read_register' will find them. */
{
register int regno;
for (regno = 0; regno < NUM_REGS; regno++)
{
char buf[MAX_REGISTER_RAW_SIZE];
val = lseek (corechan, register_addr (regno, reg_offset), 0);
if (val < 0
|| (val = myread (corechan, buf, sizeof buf)) < 0)
{
char * buffer = (char *) alloca (strlen (reg_names[regno])
+ 30);
strcpy (buffer, "Reading register ");
strcat (buffer, reg_names[regno]);
perror_with_name (buffer);
}
supply_register (regno, buf);
}
}
}
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");
}
|
