1/* BFD back end for traditional Unix core files (U-area and raw sections)
2   Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
3   2000, 2001, 2002, 2003, 2004, 2005, 2006
4   Free Software Foundation, Inc.
5   Written by John Gilmore of Cygnus Support.
6
7This file is part of BFD, the Binary File Descriptor library.
8
9This program is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 2 of the License, or
12(at your option) any later version.
13
14This program is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with this program; if not, write to the Free Software
21Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
22
23#include "bfd.h"
24#include "sysdep.h"
25#include "libbfd.h"
26#include "libaout.h"           /* BFD a.out internal data structures */
27
28#include <sys/param.h>
29#ifdef HAVE_DIRENT_H
30# include <dirent.h>
31#else
32# ifdef HAVE_SYS_NDIR_H
33#  include <sys/ndir.h>
34# endif
35# ifdef HAVE_SYS_DIR_H
36#  include <sys/dir.h>
37# endif
38# ifdef HAVE_NDIR_H
39#  include <ndir.h>
40# endif
41#endif
42#include <signal.h>
43
44#include <sys/user.h>		/* After a.out.h  */
45
46#ifdef TRAD_HEADER
47#include TRAD_HEADER
48#endif
49
50struct trad_core_struct
51{
52  asection *data_section;
53  asection *stack_section;
54  asection *reg_section;
55  struct user u;
56};
57
58#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
59#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
60#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
61#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
62
63/* forward declarations */
64
65const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd));
66char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd));
67int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd));
68#define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
69static void swap_abort PARAMS ((void));
70
71/* Handle 4.2-style (and perhaps also sysV-style) core dump file.  */
72
73const bfd_target *
74trad_unix_core_file_p (abfd)
75     bfd *abfd;
76
77{
78  int val;
79  struct user u;
80  struct trad_core_struct *rawptr;
81  bfd_size_type amt;
82  flagword flags;
83
84#ifdef TRAD_CORE_USER_OFFSET
85  /* If defined, this macro is the file position of the user struct.  */
86  if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
87    return 0;
88#endif
89
90  val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
91  if (val != sizeof u)
92    {
93      /* Too small to be a core file */
94      bfd_set_error (bfd_error_wrong_format);
95      return 0;
96    }
97
98  /* Sanity check perhaps??? */
99  if (u.u_dsize > 0x1000000)	/* Remember, it's in pages...  */
100    {
101      bfd_set_error (bfd_error_wrong_format);
102      return 0;
103    }
104  if (u.u_ssize > 0x1000000)
105    {
106      bfd_set_error (bfd_error_wrong_format);
107      return 0;
108    }
109
110  /* Check that the size claimed is no greater than the file size.  */
111  {
112    struct stat statbuf;
113
114    if (bfd_stat (abfd, &statbuf) < 0)
115      return 0;
116
117    if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize
118#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
119			    - u.u_tsize
120#endif
121			    + u.u_ssize)
122	> (ufile_ptr) statbuf.st_size)
123      {
124	bfd_set_error (bfd_error_wrong_format);
125	return 0;
126      }
127#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
128    if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize)
129#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
130	/* Some systems write the file too big.  */
131	 + TRAD_CORE_EXTRA_SIZE_ALLOWED
132#endif
133	 )
134	< (ufile_ptr) statbuf.st_size)
135      {
136	/* The file is too big.  Maybe it's not a core file
137	   or we otherwise have bad values for u_dsize and u_ssize).  */
138	bfd_set_error (bfd_error_wrong_format);
139	return 0;
140      }
141#endif
142  }
143
144  /* OK, we believe you.  You're a core file (sure, sure).  */
145
146  /* Allocate both the upage and the struct core_data at once, so
147     a single free() will free them both.  */
148  amt = sizeof (struct trad_core_struct);
149  rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
150  if (rawptr == NULL)
151    return 0;
152
153  abfd->tdata.trad_core_data = rawptr;
154
155  rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
156
157  /* Create the sections.  */
158
159  flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
160  core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
161							    flags);
162  if (core_stacksec (abfd) == NULL)
163    goto fail;
164  core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
165							    flags);
166  if (core_datasec (abfd) == NULL)
167    goto fail;
168  core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
169							   SEC_HAS_CONTENTS);
170  if (core_regsec (abfd) == NULL)
171    goto fail;
172
173  core_datasec (abfd)->size =  NBPG * u.u_dsize
174#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
175    - NBPG * u.u_tsize
176#endif
177      ;
178  core_stacksec (abfd)->size = NBPG * u.u_ssize;
179  core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
180
181  /* What a hack... we'd like to steal it from the exec file,
182     since the upage does not seem to provide it.  FIXME.  */
183#ifdef HOST_DATA_START_ADDR
184  core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
185#else
186  core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
187#endif
188
189#ifdef HOST_STACK_START_ADDR
190  core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
191#else
192  core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
193#endif
194
195  /* This is tricky.  As the "register section", we give them the entire
196     upage and stack.  u.u_ar0 points to where "register 0" is stored.
197     There are two tricks with this, though.  One is that the rest of the
198     registers might be at positive or negative (or both) displacements
199     from *u_ar0.  The other is that u_ar0 is sometimes an absolute address
200     in kernel memory, and on other systems it is an offset from the beginning
201     of the `struct user'.
202
203     As a practical matter, we don't know where the registers actually are,
204     so we have to pass the whole area to GDB.  We encode the value of u_ar0
205     by setting the .regs section up so that its virtual memory address
206     0 is at the place pointed to by u_ar0 (by setting the vma of the start
207     of the section to -u_ar0).  GDB uses this info to locate the regs,
208     using minor trickery to get around the offset-or-absolute-addr problem.  */
209  core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
210
211  core_datasec (abfd)->filepos = NBPG * UPAGES;
212  core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
213#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
214    - NBPG * u.u_tsize
215#endif
216      ;
217  core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
218
219  /* Align to word at least */
220  core_stacksec (abfd)->alignment_power = 2;
221  core_datasec (abfd)->alignment_power = 2;
222  core_regsec (abfd)->alignment_power = 2;
223
224  return abfd->xvec;
225
226 fail:
227  bfd_release (abfd, abfd->tdata.any);
228  abfd->tdata.any = NULL;
229  bfd_section_list_clear (abfd);
230  return NULL;
231}
232
233char *
234trad_unix_core_file_failing_command (abfd)
235     bfd *abfd;
236{
237#ifndef NO_CORE_COMMAND
238  char *com = abfd->tdata.trad_core_data->u.u_comm;
239  if (*com)
240    return com;
241  else
242#endif
243    return 0;
244}
245
246int
247trad_unix_core_file_failing_signal (ignore_abfd)
248     bfd *ignore_abfd ATTRIBUTE_UNUSED;
249{
250#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
251  return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
252#else
253  return -1;		/* FIXME, where is it? */
254#endif
255}
256
257/* If somebody calls any byte-swapping routines, shoot them.  */
258static void
259swap_abort ()
260{
261  abort (); /* This way doesn't require any declaration for ANSI to fuck up */
262}
263
264#define	NO_GET ((bfd_vma (*) (const void *)) swap_abort)
265#define	NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
266#define	NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
267#define	NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
268#define	NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
269#define	NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
270
271const bfd_target trad_core_vec =
272  {
273    "trad-core",
274    bfd_target_unknown_flavour,
275    BFD_ENDIAN_UNKNOWN,		/* target byte order */
276    BFD_ENDIAN_UNKNOWN,		/* target headers byte order */
277    (HAS_RELOC | EXEC_P |	/* object flags */
278     HAS_LINENO | HAS_DEBUG |
279     HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
280    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
281    0,			                                   /* symbol prefix */
282    ' ',						   /* ar_pad_char */
283    16,							   /* ar_max_namelen */
284    NO_GET64, NO_GETS64, NO_PUT64,	/* 64 bit data */
285    NO_GET, NO_GETS, NO_PUT,		/* 32 bit data */
286    NO_GET, NO_GETS, NO_PUT,		/* 16 bit data */
287    NO_GET64, NO_GETS64, NO_PUT64,	/* 64 bit hdrs */
288    NO_GET, NO_GETS, NO_PUT,		/* 32 bit hdrs */
289    NO_GET, NO_GETS, NO_PUT,		/* 16 bit hdrs */
290
291    {				/* bfd_check_format */
292      _bfd_dummy_target,		/* unknown format */
293      _bfd_dummy_target,		/* object file */
294      _bfd_dummy_target,		/* archive */
295      trad_unix_core_file_p		/* a core file */
296    },
297    {				/* bfd_set_format */
298      bfd_false, bfd_false,
299      bfd_false, bfd_false
300    },
301    {				/* bfd_write_contents */
302      bfd_false, bfd_false,
303      bfd_false, bfd_false
304    },
305
306    BFD_JUMP_TABLE_GENERIC (_bfd_generic),
307    BFD_JUMP_TABLE_COPY (_bfd_generic),
308    BFD_JUMP_TABLE_CORE (trad_unix),
309    BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
310    BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
311    BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
312    BFD_JUMP_TABLE_WRITE (_bfd_generic),
313    BFD_JUMP_TABLE_LINK (_bfd_nolink),
314    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
315
316    NULL,
317
318    (PTR) 0			/* backend_data */
319  };
320