1 /* BFD back end for traditional Unix core files (U-area and raw sections)
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Written by John Gilmore of Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
25 #include "libaout.h" /* BFD a.out internal data structures */
27 #include <sys/param.h>
31 # ifdef HAVE_SYS_NDIR_H
32 # include <sys/ndir.h>
34 # ifdef HAVE_SYS_DIR_H
43 #include <sys/user.h> /* After a.out.h */
50 # define NBPG getpagesize()
53 struct trad_core_struct
55 asection *data_section;
56 asection *stack_section;
57 asection *reg_section;
61 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
62 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
63 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
64 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
66 /* forward declarations */
68 #define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
69 #define trad_unix_core_file_pid _bfd_nocore_core_file_pid
72 /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */
74 static const bfd_target *
75 trad_unix_core_file_p (bfd *abfd)
79 struct trad_core_struct *rawptr;
83 #ifdef TRAD_CORE_USER_OFFSET
84 /* If defined, this macro is the file position of the user struct. */
85 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
89 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
92 /* Too small to be a core file */
93 bfd_set_error (bfd_error_wrong_format);
97 /* Sanity check perhaps??? */
98 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */
100 bfd_set_error (bfd_error_wrong_format);
103 if (u.u_ssize > 0x1000000)
105 bfd_set_error (bfd_error_wrong_format);
109 /* Check that the size claimed is no greater than the file size. */
113 if (bfd_stat (abfd, &statbuf) < 0)
116 if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize
117 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
121 > (ufile_ptr) statbuf.st_size)
123 bfd_set_error (bfd_error_wrong_format);
126 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
127 if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize)
128 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
129 /* Some systems write the file too big. */
130 + TRAD_CORE_EXTRA_SIZE_ALLOWED
133 < (ufile_ptr) statbuf.st_size)
135 /* The file is too big. Maybe it's not a core file
136 or we otherwise have bad values for u_dsize and u_ssize). */
137 bfd_set_error (bfd_error_wrong_format);
143 /* OK, we believe you. You're a core file (sure, sure). */
145 /* Allocate both the upage and the struct core_data at once, so
146 a single free() will free them both. */
147 amt = sizeof (struct trad_core_struct);
148 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
152 abfd->tdata.trad_core_data = rawptr;
154 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
156 /* Create the sections. */
158 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
159 core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
161 if (core_stacksec (abfd) == NULL)
163 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
165 if (core_datasec (abfd) == NULL)
167 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
169 if (core_regsec (abfd) == NULL)
172 core_datasec (abfd)->size = NBPG * u.u_dsize
173 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
177 core_stacksec (abfd)->size = NBPG * u.u_ssize;
178 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
180 /* What a hack... we'd like to steal it from the exec file,
181 since the upage does not seem to provide it. FIXME. */
182 #ifdef HOST_DATA_START_ADDR
183 core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
185 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
188 #ifdef HOST_STACK_START_ADDR
189 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
191 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
194 /* This is tricky. As the "register section", we give them the entire
195 upage and stack. u.u_ar0 points to where "register 0" is stored.
196 There are two tricks with this, though. One is that the rest of the
197 registers might be at positive or negative (or both) displacements
198 from *u_ar0. The other is that u_ar0 is sometimes an absolute address
199 in kernel memory, and on other systems it is an offset from the beginning
200 of the `struct user'.
202 As a practical matter, we don't know where the registers actually are,
203 so we have to pass the whole area to GDB. We encode the value of u_ar0
204 by setting the .regs section up so that its virtual memory address
205 0 is at the place pointed to by u_ar0 (by setting the vma of the start
206 of the section to -u_ar0). GDB uses this info to locate the regs,
207 using minor trickery to get around the offset-or-absolute-addr problem. */
208 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
210 core_datasec (abfd)->filepos = NBPG * UPAGES;
211 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
212 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
216 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
218 /* Align to word at least */
219 core_stacksec (abfd)->alignment_power = 2;
220 core_datasec (abfd)->alignment_power = 2;
221 core_regsec (abfd)->alignment_power = 2;
226 bfd_release (abfd, abfd->tdata.any);
227 abfd->tdata.any = NULL;
228 bfd_section_list_clear (abfd);
233 trad_unix_core_file_failing_command (bfd *abfd)
235 #ifndef NO_CORE_COMMAND
236 char *com = abfd->tdata.trad_core_data->u.u_comm;
245 trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED)
247 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
248 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
250 return -1; /* FIXME, where is it? */
254 /* If somebody calls any byte-swapping routines, shoot them. */
258 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
261 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
262 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
263 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
264 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
265 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
266 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
268 const bfd_target core_trad_vec =
271 bfd_target_unknown_flavour,
272 BFD_ENDIAN_UNKNOWN, /* target byte order */
273 BFD_ENDIAN_UNKNOWN, /* target headers byte order */
274 (HAS_RELOC | EXEC_P | /* object flags */
275 HAS_LINENO | HAS_DEBUG |
276 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
277 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
278 0, /* symbol prefix */
279 ' ', /* ar_pad_char */
280 16, /* ar_max_namelen */
281 0, /* match priority. */
282 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
283 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
284 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
285 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
286 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
287 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
289 { /* bfd_check_format */
290 _bfd_dummy_target, /* unknown format */
291 _bfd_dummy_target, /* object file */
292 _bfd_dummy_target, /* archive */
293 trad_unix_core_file_p /* a core file */
295 { /* bfd_set_format */
296 bfd_false, bfd_false,
299 { /* bfd_write_contents */
300 bfd_false, bfd_false,
304 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
305 BFD_JUMP_TABLE_COPY (_bfd_generic),
306 BFD_JUMP_TABLE_CORE (trad_unix),
307 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
308 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
309 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
310 BFD_JUMP_TABLE_WRITE (_bfd_generic),
311 BFD_JUMP_TABLE_LINK (_bfd_nolink),
312 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
316 NULL /* backend_data */