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252b5132 | 1 | /* BFD back end for traditional Unix core files (U-area and raw sections) |
250d07de | 2 | Copyright (C) 1988-2021 Free Software Foundation, Inc. |
252b5132 RH |
3 | Written by John Gilmore of Cygnus Support. |
4 | ||
cd123cb7 NC |
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. */ | |
252b5132 | 21 | |
252b5132 | 22 | #include "sysdep.h" |
3db64b00 | 23 | #include "bfd.h" |
252b5132 | 24 | #include "libbfd.h" |
07d6d2b8 | 25 | #include "libaout.h" /* BFD a.out internal data structures */ |
252b5132 RH |
26 | |
27 | #include <sys/param.h> | |
83c79df8 | 28 | #include <dirent.h> |
252b5132 RH |
29 | #include <signal.h> |
30 | ||
31 | #include <sys/user.h> /* After a.out.h */ | |
32 | ||
33 | #ifdef TRAD_HEADER | |
34 | #include TRAD_HEADER | |
35 | #endif | |
36 | ||
d955dada MF |
37 | #ifndef NBPG |
38 | # define NBPG getpagesize() | |
39 | #endif | |
40 | ||
b34976b6 AM |
41 | struct trad_core_struct |
42 | { | |
43 | asection *data_section; | |
44 | asection *stack_section; | |
45 | asection *reg_section; | |
46 | struct user u; | |
47 | }; | |
252b5132 | 48 | |
2c3fc389 NC |
49 | #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) |
50 | #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) | |
252b5132 | 51 | #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) |
2c3fc389 | 52 | #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) |
252b5132 RH |
53 | |
54 | /* forward declarations */ | |
55 | ||
69d246d9 | 56 | #define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p |
261b8d08 | 57 | #define trad_unix_core_file_pid _bfd_nocore_core_file_pid |
252b5132 | 58 | |
252b5132 | 59 | |
2c3fc389 | 60 | /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ |
252b5132 | 61 | |
728d32c4 | 62 | static bfd_cleanup |
2c3fc389 | 63 | trad_unix_core_file_p (bfd *abfd) |
252b5132 RH |
64 | { |
65 | int val; | |
66 | struct user u; | |
67 | struct trad_core_struct *rawptr; | |
986f0783 | 68 | size_t amt; |
117ed4f8 | 69 | flagword flags; |
252b5132 RH |
70 | |
71 | #ifdef TRAD_CORE_USER_OFFSET | |
72 | /* If defined, this macro is the file position of the user struct. */ | |
dc810e39 | 73 | if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) |
252b5132 RH |
74 | return 0; |
75 | #endif | |
5bff4f56 | 76 | |
dc810e39 | 77 | val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd); |
252b5132 RH |
78 | if (val != sizeof u) |
79 | { | |
80 | /* Too small to be a core file */ | |
81 | bfd_set_error (bfd_error_wrong_format); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | /* Sanity check perhaps??? */ | |
5bff4f56 | 86 | if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ |
252b5132 RH |
87 | { |
88 | bfd_set_error (bfd_error_wrong_format); | |
89 | return 0; | |
90 | } | |
91 | if (u.u_ssize > 0x1000000) | |
92 | { | |
93 | bfd_set_error (bfd_error_wrong_format); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* Check that the size claimed is no greater than the file size. */ | |
98 | { | |
252b5132 | 99 | struct stat statbuf; |
33216455 | 100 | |
b677b8c0 | 101 | if (bfd_stat (abfd, &statbuf) < 0) |
3dff57e8 | 102 | return 0; |
b677b8c0 | 103 | |
74633dd0 | 104 | if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize |
252b5132 | 105 | #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE |
74633dd0 | 106 | - u.u_tsize |
252b5132 | 107 | #endif |
74633dd0 AM |
108 | + u.u_ssize) |
109 | > (ufile_ptr) statbuf.st_size) | |
252b5132 | 110 | { |
b35efbcd | 111 | bfd_set_error (bfd_error_wrong_format); |
252b5132 RH |
112 | return 0; |
113 | } | |
114 | #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE | |
74633dd0 | 115 | if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize) |
252b5132 RH |
116 | #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED |
117 | /* Some systems write the file too big. */ | |
74633dd0 | 118 | + TRAD_CORE_EXTRA_SIZE_ALLOWED |
252b5132 | 119 | #endif |
74633dd0 AM |
120 | ) |
121 | < (ufile_ptr) statbuf.st_size) | |
252b5132 RH |
122 | { |
123 | /* The file is too big. Maybe it's not a core file | |
124 | or we otherwise have bad values for u_dsize and u_ssize). */ | |
125 | bfd_set_error (bfd_error_wrong_format); | |
126 | return 0; | |
127 | } | |
128 | #endif | |
129 | } | |
130 | ||
131 | /* OK, we believe you. You're a core file (sure, sure). */ | |
132 | ||
133 | /* Allocate both the upage and the struct core_data at once, so | |
134 | a single free() will free them both. */ | |
dc810e39 AM |
135 | amt = sizeof (struct trad_core_struct); |
136 | rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); | |
252b5132 RH |
137 | if (rawptr == NULL) |
138 | return 0; | |
5bff4f56 | 139 | |
252b5132 RH |
140 | abfd->tdata.trad_core_data = rawptr; |
141 | ||
142 | rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ | |
143 | ||
9e7b37b3 | 144 | /* Create the sections. */ |
252b5132 | 145 | |
117ed4f8 AM |
146 | flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; |
147 | core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", | |
148 | flags); | |
252b5132 | 149 | if (core_stacksec (abfd) == NULL) |
9e7b37b3 | 150 | goto fail; |
117ed4f8 AM |
151 | core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", |
152 | flags); | |
252b5132 | 153 | if (core_datasec (abfd) == NULL) |
9e7b37b3 | 154 | goto fail; |
117ed4f8 AM |
155 | core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", |
156 | SEC_HAS_CONTENTS); | |
252b5132 | 157 | if (core_regsec (abfd) == NULL) |
9e7b37b3 | 158 | goto fail; |
252b5132 | 159 | |
eea6121a | 160 | core_datasec (abfd)->size = NBPG * u.u_dsize |
252b5132 RH |
161 | #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE |
162 | - NBPG * u.u_tsize | |
163 | #endif | |
164 | ; | |
eea6121a AM |
165 | core_stacksec (abfd)->size = NBPG * u.u_ssize; |
166 | core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */ | |
252b5132 RH |
167 | |
168 | /* What a hack... we'd like to steal it from the exec file, | |
169 | since the upage does not seem to provide it. FIXME. */ | |
170 | #ifdef HOST_DATA_START_ADDR | |
171 | core_datasec (abfd)->vma = HOST_DATA_START_ADDR; | |
172 | #else | |
173 | core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); | |
174 | #endif | |
175 | ||
176 | #ifdef HOST_STACK_START_ADDR | |
177 | core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; | |
178 | #else | |
179 | core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); | |
180 | #endif | |
181 | ||
182 | /* This is tricky. As the "register section", we give them the entire | |
183 | upage and stack. u.u_ar0 points to where "register 0" is stored. | |
184 | There are two tricks with this, though. One is that the rest of the | |
185 | registers might be at positive or negative (or both) displacements | |
186 | from *u_ar0. The other is that u_ar0 is sometimes an absolute address | |
187 | in kernel memory, and on other systems it is an offset from the beginning | |
188 | of the `struct user'. | |
5bff4f56 | 189 | |
252b5132 RH |
190 | As a practical matter, we don't know where the registers actually are, |
191 | so we have to pass the whole area to GDB. We encode the value of u_ar0 | |
192 | by setting the .regs section up so that its virtual memory address | |
193 | 0 is at the place pointed to by u_ar0 (by setting the vma of the start | |
194 | of the section to -u_ar0). GDB uses this info to locate the regs, | |
5bff4f56 | 195 | using minor trickery to get around the offset-or-absolute-addr problem. */ |
d426c6b0 | 196 | core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0; |
252b5132 RH |
197 | |
198 | core_datasec (abfd)->filepos = NBPG * UPAGES; | |
199 | core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize | |
200 | #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE | |
201 | - NBPG * u.u_tsize | |
202 | #endif | |
203 | ; | |
204 | core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ | |
205 | ||
206 | /* Align to word at least */ | |
207 | core_stacksec (abfd)->alignment_power = 2; | |
208 | core_datasec (abfd)->alignment_power = 2; | |
209 | core_regsec (abfd)->alignment_power = 2; | |
210 | ||
728d32c4 | 211 | return _bfd_no_cleanup; |
9e7b37b3 AM |
212 | |
213 | fail: | |
214 | bfd_release (abfd, abfd->tdata.any); | |
215 | abfd->tdata.any = NULL; | |
216 | bfd_section_list_clear (abfd); | |
217 | return NULL; | |
252b5132 RH |
218 | } |
219 | ||
2c3fc389 NC |
220 | static char * |
221 | trad_unix_core_file_failing_command (bfd *abfd) | |
252b5132 RH |
222 | { |
223 | #ifndef NO_CORE_COMMAND | |
224 | char *com = abfd->tdata.trad_core_data->u.u_comm; | |
225 | if (*com) | |
226 | return com; | |
227 | else | |
228 | #endif | |
229 | return 0; | |
230 | } | |
231 | ||
2c3fc389 NC |
232 | static int |
233 | trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED) | |
252b5132 RH |
234 | { |
235 | #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL | |
236 | return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); | |
237 | #else | |
238 | return -1; /* FIXME, where is it? */ | |
239 | #endif | |
240 | } | |
252b5132 RH |
241 | \f |
242 | /* If somebody calls any byte-swapping routines, shoot them. */ | |
243 | static void | |
2c3fc389 | 244 | swap_abort (void) |
252b5132 | 245 | { |
5bff4f56 | 246 | abort (); /* This way doesn't require any declaration for ANSI to fuck up */ |
252b5132 | 247 | } |
8ce8c090 | 248 | |
edeb6e24 AM |
249 | #define NO_GET ((bfd_vma (*) (const void *)) swap_abort) |
250 | #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) | |
251 | #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) | |
8ce8c090 AM |
252 | #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) |
253 | #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) | |
254 | #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) | |
252b5132 | 255 | |
6d00b590 | 256 | const bfd_target core_trad_vec = |
252b5132 RH |
257 | { |
258 | "trad-core", | |
259 | bfd_target_unknown_flavour, | |
260 | BFD_ENDIAN_UNKNOWN, /* target byte order */ | |
261 | BFD_ENDIAN_UNKNOWN, /* target headers byte order */ | |
262 | (HAS_RELOC | EXEC_P | /* object flags */ | |
263 | HAS_LINENO | HAS_DEBUG | | |
264 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), | |
265 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ | |
0aabe54e AM |
266 | 0, /* symbol prefix */ |
267 | ' ', /* ar_pad_char */ | |
268 | 16, /* ar_max_namelen */ | |
269 | 0, /* match priority. */ | |
d1bcae83 | 270 | TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ |
8ce8c090 | 271 | NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ |
edeb6e24 AM |
272 | NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ |
273 | NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ | |
8ce8c090 | 274 | NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ |
edeb6e24 AM |
275 | NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ |
276 | NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ | |
252b5132 RH |
277 | |
278 | { /* bfd_check_format */ | |
8ce8c090 AM |
279 | _bfd_dummy_target, /* unknown format */ |
280 | _bfd_dummy_target, /* object file */ | |
281 | _bfd_dummy_target, /* archive */ | |
282 | trad_unix_core_file_p /* a core file */ | |
252b5132 RH |
283 | }, |
284 | { /* bfd_set_format */ | |
d00dd7dc AM |
285 | _bfd_bool_bfd_false_error, |
286 | _bfd_bool_bfd_false_error, | |
287 | _bfd_bool_bfd_false_error, | |
288 | _bfd_bool_bfd_false_error | |
252b5132 RH |
289 | }, |
290 | { /* bfd_write_contents */ | |
d00dd7dc AM |
291 | _bfd_bool_bfd_false_error, |
292 | _bfd_bool_bfd_false_error, | |
293 | _bfd_bool_bfd_false_error, | |
294 | _bfd_bool_bfd_false_error | |
252b5132 | 295 | }, |
5bff4f56 | 296 | |
8ce8c090 AM |
297 | BFD_JUMP_TABLE_GENERIC (_bfd_generic), |
298 | BFD_JUMP_TABLE_COPY (_bfd_generic), | |
299 | BFD_JUMP_TABLE_CORE (trad_unix), | |
300 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), | |
301 | BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), | |
302 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), | |
303 | BFD_JUMP_TABLE_WRITE (_bfd_generic), | |
304 | BFD_JUMP_TABLE_LINK (_bfd_nolink), | |
305 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), | |
252b5132 | 306 | |
c3c89269 | 307 | NULL, |
5bff4f56 | 308 | |
2c3fc389 | 309 | NULL /* backend_data */ |
8ce8c090 | 310 | }; |