1/* BFD back end for Lynx core files
2   Copyright (C) 1993-2017 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
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#define lynx_core_file_pid _bfd_nocore_core_file_pid
56
57/* Handle Lynx core dump file.  */
58
59static asection *
60make_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
88const bfd_target *
89lynx_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  bfd_size_type 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  /* Allocate space for the thread contexts */
130
131  threadp = (core_st_t *) bfd_alloc (abfd, tcontext_size);
132  if (!threadp)
133    goto fail;
134
135  /* Save thread contexts */
136
137  if (bfd_seek (abfd, (file_ptr) pagesize, SEEK_SET) != 0)
138    goto fail;
139
140  if (bfd_bread ((void *) threadp, tcontext_size, abfd) != tcontext_size)
141    {
142      /* Probably too small to be a core file */
143      if (bfd_get_error () != bfd_error_system_call)
144	bfd_set_error (bfd_error_wrong_format);
145      goto fail;
146    }
147
148  core_signal (abfd) = threadp->currsig;
149
150  newsect = make_bfd_asection (abfd, ".stack",
151			       SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
152			       pss.ssize,
153			       pss.slimit,
154			       pagesize + tcontext_size);
155  if (!newsect)
156    goto fail;
157
158  newsect = make_bfd_asection (abfd, ".data",
159			       SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
160			       pss.data_len + pss.bss_len,
161			       pss.data_start,
162			       pagesize + tcontext_size + pss.ssize
163#if defined (SPARC) || defined (__SPARC__)
164			       /* SPARC Lynx seems to start dumping
165                                  the .data section at a page
166                                  boundary.  It's OK to check a
167                                  #define like SPARC here because this
168                                  file can only be compiled on a Lynx
169                                  host.  */
170			       + pss.data_start % pagesize
171#endif
172			       );
173  if (!newsect)
174    goto fail;
175
176/* And, now for the .reg/XXX pseudo sections.  Each thread has it's own
177   .reg/XXX section, where XXX is the thread id (without leading zeros).  The
178   currently running thread (at the time of the core dump) also has an alias
179   called `.reg' (just to keep GDB happy).  Note that we use `.reg/XXX' as
180   opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
181   point registers.  */
182
183  newsect = make_bfd_asection (abfd, ".reg",
184			       SEC_HAS_CONTENTS,
185			       sizeof (core_st_t),
186			       0,
187			       pagesize);
188  if (!newsect)
189    goto fail;
190
191  for (secnum = 0; secnum < pss.threadcnt; secnum++)
192    {
193      char secname[100];
194
195      sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
196      newsect = make_bfd_asection (abfd, secname,
197				   SEC_HAS_CONTENTS,
198				   sizeof (core_st_t),
199				   0,
200				   pagesize + secnum * sizeof (core_st_t));
201      if (!newsect)
202	goto fail;
203    }
204
205  return abfd->xvec;
206
207 fail:
208  bfd_release (abfd, core_hdr (abfd));
209  core_hdr (abfd) = NULL;
210  bfd_section_list_clear (abfd);
211  return NULL;
212}
213
214char *
215lynx_core_file_failing_command (bfd *abfd)
216{
217  return core_command (abfd);
218}
219
220int
221lynx_core_file_failing_signal (bfd *abfd)
222{
223  return core_signal (abfd);
224}
225
226#endif /* LYNX_CORE */
227