1/* BFD back end for Lynx core files
2   Copyright 1993, 1994, 1995, 2001, 2002, 2004
3   Free Software Foundation, Inc.
4   Written by Stu Grossman of Cygnus Support.
5
6This file is part of BFD, the Binary File Descriptor library.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
20Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
21
22#include "bfd.h"
23#include "sysdep.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
44struct 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
56/* Handle Lynx core dump file.  */
57
58static asection *
59make_bfd_asection (abfd, name, flags, size, vma, filepos)
60     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 (abfd, newname);
77  if (!asect)
78    return NULL;
79
80  asect->flags = flags;
81  asect->size = size;
82  asect->vma = vma;
83  asect->filepos = filepos;
84  asect->alignment_power = 2;
85
86  return asect;
87}
88
89const bfd_target *
90lynx_core_file_p (abfd)
91     bfd *abfd;
92{
93  int secnum;
94  struct pssentry pss;
95  bfd_size_type tcontext_size;
96  core_st_t *threadp;
97  int pagesize;
98  asection *newsect;
99  bfd_size_type amt;
100
101  pagesize = getpagesize ();	/* Serious cross-target issue here...  This
102				   really needs to come from a system-specific
103				   header file.  */
104
105  /* Get the pss entry from the core file */
106
107  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
108    return NULL;
109
110  amt = sizeof pss;
111  if (bfd_bread ((void *) &pss, amt, abfd) != amt)
112    {
113      /* Too small to be a core file */
114      if (bfd_get_error () != bfd_error_system_call)
115	bfd_set_error (bfd_error_wrong_format);
116      return NULL;
117    }
118
119  amt = sizeof (struct lynx_core_struct);
120  core_hdr (abfd) = (struct lynx_core_struct *) bfd_zalloc (abfd, amt);
121
122  if (!core_hdr (abfd))
123    return NULL;
124
125  strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
126
127  /* Compute the size of the thread contexts */
128
129  tcontext_size = pss.threadcnt * sizeof (core_st_t);
130
131  /* Allocate space for the thread contexts */
132
133  threadp = (core_st_t *) bfd_alloc (abfd, tcontext_size);
134  if (!threadp)
135    goto fail;
136
137  /* Save thread contexts */
138
139  if (bfd_seek (abfd, (file_ptr) pagesize, SEEK_SET) != 0)
140    goto fail;
141
142  if (bfd_bread ((void *) threadp, tcontext_size, abfd) != tcontext_size)
143    {
144      /* Probably too small to be a core file */
145      if (bfd_get_error () != bfd_error_system_call)
146	bfd_set_error (bfd_error_wrong_format);
147      goto fail;
148    }
149
150  core_signal (abfd) = threadp->currsig;
151
152  newsect = make_bfd_asection (abfd, ".stack",
153			       SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
154			       pss.ssize,
155			       pss.slimit,
156			       pagesize + tcontext_size);
157  if (!newsect)
158    goto fail;
159
160  newsect = make_bfd_asection (abfd, ".data",
161			       SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
162			       pss.data_len + pss.bss_len,
163			       pss.data_start,
164			       pagesize + tcontext_size + pss.ssize
165#if defined (SPARC) || defined (__SPARC__)
166			       /* SPARC Lynx seems to start dumping
167                                  the .data section at a page
168                                  boundary.  It's OK to check a
169                                  #define like SPARC here because this
170                                  file can only be compiled on a Lynx
171                                  host.  */
172			       + pss.data_start % pagesize
173#endif
174			       );
175  if (!newsect)
176    goto fail;
177
178/* And, now for the .reg/XXX pseudo sections.  Each thread has it's own
179   .reg/XXX section, where XXX is the thread id (without leading zeros).  The
180   currently running thread (at the time of the core dump) also has an alias
181   called `.reg' (just to keep GDB happy).  Note that we use `.reg/XXX' as
182   opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
183   point registers.  */
184
185  newsect = make_bfd_asection (abfd, ".reg",
186			       SEC_HAS_CONTENTS,
187			       sizeof (core_st_t),
188			       0,
189			       pagesize);
190  if (!newsect)
191    goto fail;
192
193  for (secnum = 0; secnum < pss.threadcnt; secnum++)
194    {
195      char secname[100];
196
197      sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
198      newsect = make_bfd_asection (abfd, secname,
199				   SEC_HAS_CONTENTS,
200				   sizeof (core_st_t),
201				   0,
202				   pagesize + secnum * sizeof (core_st_t));
203      if (!newsect)
204	goto fail;
205    }
206
207  return abfd->xvec;
208
209 fail:
210  bfd_release (abfd, core_hdr (abfd));
211  core_hdr (abfd) = NULL;
212  bfd_section_list_clear (abfd);
213  return NULL;
214}
215
216char *
217lynx_core_file_failing_command (abfd)
218     bfd *abfd;
219{
220  return core_command (abfd);
221}
222
223int
224lynx_core_file_failing_signal (abfd)
225     bfd *abfd;
226{
227  return core_signal (abfd);
228}
229
230#endif /* LYNX_CORE */
231