1 /* BFD back end for Lynx core files
2 Copyright (C) 1993-2023 Free Software Foundation, Inc.
3 Written by Stu Grossman of Cygnus Support.
4
5 This file is part of BFD, the Binary File Descriptor library.
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, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25
26 #ifdef LYNX_CORE
27
28 #include <sys/conf.h>
29 #include <sys/kernel.h>
30 /* sys/kernel.h should define this, but doesn't always, sigh. */
31 #ifndef __LYNXOS
32 #define __LYNXOS
33 #endif
34 #include <sys/mem.h>
35 #include <sys/signal.h>
36 #include <sys/time.h>
37 #include <sys/resource.h>
38 #include <sys/itimer.h>
39 #include <sys/file.h>
40 #include <sys/proc.h>
41
42 /* These are stored in the bfd's tdata */
43
44 struct lynx_core_struct
45 {
46 int sig;
47 char cmd[PNMLEN + 1];
48 };
49
50 #define core_hdr(bfd) ((bfd)->tdata.lynx_core_data)
51 #define core_signal(bfd) (core_hdr(bfd)->sig)
52 #define core_command(bfd) (core_hdr(bfd)->cmd)
53
54 #define lynx_core_file_matches_executable_p generic_core_file_matches_executable_p
55 #define lynx_core_file_pid _bfd_nocore_core_file_pid
56
57 /* Handle Lynx core dump file. */
58
59 static asection *
60 make_bfd_asection (bfd *abfd,
61 const char *name,
62 flagword flags,
63 bfd_size_type size,
64 bfd_vma vma,
65 file_ptr filepos)
66 {
67 asection *asect;
68 char *newname;
69
70 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
71 if (!newname)
72 return NULL;
73
74 strcpy (newname, name);
75
76 asect = bfd_make_section_with_flags (abfd, newname, flags);
77 if (!asect)
78 return NULL;
79
80 asect->size = size;
81 asect->vma = vma;
82 asect->filepos = filepos;
83 asect->alignment_power = 2;
84
85 return asect;
86 }
87
88 bfd_cleanup
89 lynx_core_file_p (bfd *abfd)
90 {
91 int secnum;
92 struct pssentry pss;
93 bfd_size_type tcontext_size;
94 core_st_t *threadp;
95 int pagesize;
96 asection *newsect;
97 size_t amt;
98
99 pagesize = getpagesize (); /* Serious cross-target issue here... This
100 really needs to come from a system-specific
101 header file. */
102
103 /* Get the pss entry from the core file */
104
105 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
106 return NULL;
107
108 amt = sizeof pss;
109 if (bfd_bread ((void *) &pss, amt, abfd) != amt)
110 {
111 /* Too small to be a core file */
112 if (bfd_get_error () != bfd_error_system_call)
113 bfd_set_error (bfd_error_wrong_format);
114 return NULL;
115 }
116
117 amt = sizeof (struct lynx_core_struct);
118 core_hdr (abfd) = (struct lynx_core_struct *) bfd_zalloc (abfd, amt);
119
120 if (!core_hdr (abfd))
121 return NULL;
122
123 strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
124
125 /* Compute the size of the thread contexts */
126
127 tcontext_size = pss.threadcnt * sizeof (core_st_t);
128
129 /* Save thread contexts */
130 if (bfd_seek (abfd, pagesize, SEEK_SET) != 0)
131 goto fail;
132 threadp = (core_st_t *) _bfd_alloc_and_read (abfd, tcontext_size,
133 tcontext_size);
134 if (!threadp)
135 goto fail;
136
137 core_signal (abfd) = threadp->currsig;
138
139 newsect = make_bfd_asection (abfd, ".stack",
140 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
141 pss.ssize,
142 pss.slimit,
143 pagesize + tcontext_size);
144 if (!newsect)
145 goto fail;
146
147 newsect = make_bfd_asection (abfd, ".data",
148 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
149 pss.data_len + pss.bss_len,
150 pss.data_start,
151 pagesize + tcontext_size + pss.ssize
152 #if defined (SPARC) || defined (__SPARC__)
153 /* SPARC Lynx seems to start dumping
154 the .data section at a page
155 boundary. It's OK to check a
156 #define like SPARC here because this
157 file can only be compiled on a Lynx
158 host. */
159 + pss.data_start % pagesize
160 #endif
161 );
162 if (!newsect)
163 goto fail;
164
165 /* And, now for the .reg/XXX pseudo sections. Each thread has it's own
166 .reg/XXX section, where XXX is the thread id (without leading zeros). The
167 currently running thread (at the time of the core dump) also has an alias
168 called `.reg' (just to keep GDB happy). Note that we use `.reg/XXX' as
169 opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
170 point registers. */
171
172 newsect = make_bfd_asection (abfd, ".reg",
173 SEC_HAS_CONTENTS,
174 sizeof (core_st_t),
175 0,
176 pagesize);
177 if (!newsect)
178 goto fail;
179
180 for (secnum = 0; secnum < pss.threadcnt; secnum++)
181 {
182 char secname[100];
183
184 sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
185 newsect = make_bfd_asection (abfd, secname,
186 SEC_HAS_CONTENTS,
187 sizeof (core_st_t),
188 0,
189 pagesize + secnum * sizeof (core_st_t));
190 if (!newsect)
191 goto fail;
192 }
193
194 return _bfd_no_cleanup;
195
196 fail:
197 bfd_release (abfd, core_hdr (abfd));
198 core_hdr (abfd) = NULL;
199 bfd_section_list_clear (abfd);
200 return NULL;
201 }
202
203 char *
204 lynx_core_file_failing_command (bfd *abfd)
205 {
206 return core_command (abfd);
207 }
208
209 int
210 lynx_core_file_failing_signal (bfd *abfd)
211 {
212 return core_signal (abfd);
213 }
214
215 #endif /* LYNX_CORE */