Commit | Line | Data |
---|---|---|
a4f68544 | 1 | /* BFD back-end for Intel 386 COFF files (DJGPP variant with a stub). |
cc643b88 | 2 | Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007, 2009, |
691bf19c | 3 | 2011, 2012 Free Software Foundation, Inc. |
252b5132 RH |
4 | Written by Robert Hoehne. |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
cd123cb7 | 10 | the Free Software Foundation; either version 3 of the License, or |
252b5132 RH |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
cd123cb7 NC |
20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
21 | MA 02110-1301, USA. */ | |
252b5132 RH |
22 | |
23 | /* This file handles now also stubbed coff images. The stub is a small | |
24 | DOS executable program before the coff image to load it in memory | |
25 | and execute it. This is needed, because DOS cannot run coff files. | |
26 | ||
27 | All the functions below are called by the corresponding functions | |
28 | from coffswap.h. | |
29 | The only thing what they do is to adjust the information stored in | |
30 | the COFF file which are offset into the file. | |
31 | This is needed, because DJGPP uses a very special way to load and run | |
32 | the coff image. It loads the image in memory and assumes then, that the | |
33 | image had no stub by using the filepointers as pointers in the coff | |
34 | image and NOT in the file. | |
35 | ||
36 | To be compatible with any existing executables I have fixed this | |
246178f2 | 37 | here and NOT in the DJGPP startup code. */ |
252b5132 RH |
38 | |
39 | #define TARGET_SYM go32stubbedcoff_vec | |
40 | #define TARGET_NAME "coff-go32-exe" | |
41 | #define TARGET_UNDERSCORE '_' | |
42 | #define COFF_GO32_EXE | |
242eabea ILT |
43 | #define COFF_LONG_SECTION_NAMES |
44 | #define COFF_SUPPORT_GNU_LINKONCE | |
a4f68544 | 45 | #define COFF_LONG_FILENAMES |
252b5132 | 46 | |
5dccc1dd ILT |
47 | #define COFF_SECTION_ALIGNMENT_ENTRIES \ |
48 | { COFF_SECTION_NAME_EXACT_MATCH (".data"), \ | |
49 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \ | |
50 | { COFF_SECTION_NAME_EXACT_MATCH (".text"), \ | |
a7bda527 DD |
51 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \ |
52 | { COFF_SECTION_NAME_PARTIAL_MATCH (".debug"), \ | |
26cd54bf | 53 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 }, \ |
4f6fbb1a | 54 | { COFF_SECTION_NAME_PARTIAL_MATCH (".gnu.linkonce.wi"), \ |
a7bda527 | 55 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 } |
5dccc1dd | 56 | |
691bf19c | 57 | #include "sysdep.h" |
252b5132 RH |
58 | #include "bfd.h" |
59 | ||
246178f2 | 60 | /* At first the prototypes. */ |
252b5132 RH |
61 | |
62 | static void | |
246178f2 | 63 | adjust_filehdr_in_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 64 | static void |
246178f2 | 65 | adjust_filehdr_out_pre PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 66 | static void |
246178f2 | 67 | adjust_filehdr_out_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 68 | static void |
246178f2 | 69 | adjust_scnhdr_in_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 70 | static void |
246178f2 | 71 | adjust_scnhdr_out_pre PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 72 | static void |
246178f2 | 73 | adjust_scnhdr_out_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 74 | static void |
246178f2 | 75 | adjust_aux_in_post PARAMS ((bfd *, PTR, int, int, int, int, PTR)); |
252b5132 | 76 | static void |
246178f2 | 77 | adjust_aux_out_pre PARAMS ((bfd *, PTR, int, int, int, int, PTR)); |
252b5132 | 78 | static void |
246178f2 | 79 | adjust_aux_out_post PARAMS ((bfd *, PTR, int, int, int, int, PTR)); |
252b5132 | 80 | static void |
246178f2 | 81 | create_go32_stub PARAMS ((bfd *)); |
252b5132 | 82 | |
246178f2 | 83 | /* All that ..._PRE and ...POST functions are called from the corresponding |
252b5132 | 84 | coff_swap... functions. The ...PRE functions are called at the beginning |
246178f2 | 85 | of the function and the ...POST functions at the end of the swap routines. */ |
252b5132 RH |
86 | |
87 | #define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post | |
88 | #define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre | |
89 | #define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post | |
90 | ||
91 | #define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post | |
92 | #define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre | |
93 | #define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post | |
94 | ||
95 | #define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post | |
96 | #define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre | |
97 | #define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post | |
98 | ||
156f6ad8 JK |
99 | static const bfd_target *go32_check_format (bfd *abfd); |
100 | ||
101 | #define COFF_CHECK_FORMAT go32_check_format | |
102 | ||
b34976b6 | 103 | static bfd_boolean |
246178f2 | 104 | go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *)); |
252b5132 RH |
105 | |
106 | #define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data | |
107 | ||
108 | #include "coff-i386.c" | |
109 | ||
cc643b88 | 110 | /* This macro is used, because I cannot assume the endianness of the |
246178f2 | 111 | host system. */ |
cc643b88 | 112 | #define _H(index) (H_GET_16 (abfd, (header + index * 2))) |
252b5132 | 113 | |
252b5132 | 114 | /* These bytes are a 2048-byte DOS executable, which loads the COFF |
246178f2 | 115 | image into memory and then runs it. It is called 'stub'. */ |
252b5132 | 116 | |
9bf609ec | 117 | static const unsigned char stub_bytes[GO32_STUBSIZE] = |
252b5132 RH |
118 | { |
119 | #include "go32stub.h" | |
120 | }; | |
121 | ||
122 | /* | |
123 | I have not commented each swap function below, because the | |
124 | technique is in any function the same. For the ...in function, | |
9bf609ec | 125 | all the pointers are adjusted by adding GO32_STUBSIZE and for the |
252b5132 | 126 | ...out function, it is subtracted first and after calling the |
246178f2 | 127 | standard swap function it is reset to the old value. */ |
252b5132 RH |
128 | |
129 | /* This macro is used for adjusting the filepointers, which | |
246178f2 | 130 | is done only, if the pointer is nonzero. */ |
252b5132 RH |
131 | |
132 | #define ADJUST_VAL(val,diff) \ | |
133 | if (val != 0) val += diff | |
134 | ||
135 | static void | |
136 | adjust_filehdr_in_post (abfd, src, dst) | |
9bf609ec | 137 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
138 | PTR src; |
139 | PTR dst; | |
140 | { | |
141 | FILHDR *filehdr_src = (FILHDR *) src; | |
142 | struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; | |
143 | ||
9bf609ec | 144 | ADJUST_VAL (filehdr_dst->f_symptr, GO32_STUBSIZE); |
252b5132 | 145 | |
9bf609ec JK |
146 | /* Save now the stub to be used later. Put the stub data to FILEHDR_DST |
147 | first as coff_data (abfd) still does not exist. It may not even be ever | |
148 | created as we are just checking the file format of ABFD. */ | |
149 | memcpy (filehdr_dst->go32stub, filehdr_src->stub, GO32_STUBSIZE); | |
150 | filehdr_dst->f_flags |= F_GO32STUB; | |
252b5132 RH |
151 | } |
152 | ||
153 | static void | |
154 | adjust_filehdr_out_pre (abfd, in, out) | |
155 | bfd *abfd; | |
156 | PTR in; | |
157 | PTR out; | |
158 | { | |
159 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
160 | FILHDR *filehdr_out = (FILHDR *) out; | |
161 | ||
246178f2 | 162 | /* Generate the stub. */ |
252b5132 RH |
163 | create_go32_stub (abfd); |
164 | ||
246178f2 | 165 | /* Copy the stub to the file header. */ |
9bf609ec JK |
166 | if (coff_data (abfd)->go32stub != NULL) |
167 | memcpy (filehdr_out->stub, coff_data (abfd)->go32stub, GO32_STUBSIZE); | |
252b5132 | 168 | else |
246178f2 | 169 | /* Use the default. */ |
9bf609ec | 170 | memcpy (filehdr_out->stub, stub_bytes, GO32_STUBSIZE); |
252b5132 | 171 | |
9bf609ec | 172 | ADJUST_VAL (filehdr_in->f_symptr, -GO32_STUBSIZE); |
252b5132 RH |
173 | } |
174 | ||
175 | static void | |
176 | adjust_filehdr_out_post (abfd, in, out) | |
5f771d47 | 177 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 178 | PTR in; |
5f771d47 | 179 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
180 | { |
181 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
246178f2 | 182 | /* Undo the above change. */ |
9bf609ec | 183 | ADJUST_VAL (filehdr_in->f_symptr, GO32_STUBSIZE); |
252b5132 RH |
184 | } |
185 | ||
186 | static void | |
187 | adjust_scnhdr_in_post (abfd, ext, in) | |
5f771d47 ILT |
188 | bfd *abfd ATTRIBUTE_UNUSED; |
189 | PTR ext ATTRIBUTE_UNUSED; | |
252b5132 RH |
190 | PTR in; |
191 | { | |
192 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
193 | ||
9bf609ec JK |
194 | ADJUST_VAL (scnhdr_int->s_scnptr, GO32_STUBSIZE); |
195 | ADJUST_VAL (scnhdr_int->s_relptr, GO32_STUBSIZE); | |
196 | ADJUST_VAL (scnhdr_int->s_lnnoptr, GO32_STUBSIZE); | |
252b5132 RH |
197 | } |
198 | ||
199 | static void | |
200 | adjust_scnhdr_out_pre (abfd, in, out) | |
5f771d47 | 201 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 202 | PTR in; |
5f771d47 | 203 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
204 | { |
205 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
206 | ||
9bf609ec JK |
207 | ADJUST_VAL (scnhdr_int->s_scnptr, -GO32_STUBSIZE); |
208 | ADJUST_VAL (scnhdr_int->s_relptr, -GO32_STUBSIZE); | |
209 | ADJUST_VAL (scnhdr_int->s_lnnoptr, -GO32_STUBSIZE); | |
252b5132 RH |
210 | } |
211 | ||
212 | static void | |
213 | adjust_scnhdr_out_post (abfd, in, out) | |
5f771d47 | 214 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 215 | PTR in; |
5f771d47 | 216 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
217 | { |
218 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
219 | ||
9bf609ec JK |
220 | ADJUST_VAL (scnhdr_int->s_scnptr, GO32_STUBSIZE); |
221 | ADJUST_VAL (scnhdr_int->s_relptr, GO32_STUBSIZE); | |
222 | ADJUST_VAL (scnhdr_int->s_lnnoptr, GO32_STUBSIZE); | |
252b5132 RH |
223 | } |
224 | ||
225 | static void | |
96d56e9f | 226 | adjust_aux_in_post (abfd, ext1, type, in_class, indx, numaux, in1) |
5f771d47 ILT |
227 | bfd *abfd ATTRIBUTE_UNUSED; |
228 | PTR ext1 ATTRIBUTE_UNUSED; | |
252b5132 | 229 | int type; |
96d56e9f | 230 | int in_class; |
5f771d47 ILT |
231 | int indx ATTRIBUTE_UNUSED; |
232 | int numaux ATTRIBUTE_UNUSED; | |
252b5132 RH |
233 | PTR in1; |
234 | { | |
235 | union internal_auxent *in = (union internal_auxent *) in1; | |
236 | ||
96d56e9f NC |
237 | if (in_class == C_BLOCK || in_class == C_FCN || ISFCN (type) |
238 | || ISTAG (in_class)) | |
252b5132 | 239 | { |
9bf609ec | 240 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, GO32_STUBSIZE); |
252b5132 RH |
241 | } |
242 | } | |
243 | ||
244 | static void | |
96d56e9f | 245 | adjust_aux_out_pre (abfd, inp, type, in_class, indx, numaux, extp) |
5f771d47 | 246 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
247 | PTR inp; |
248 | int type; | |
96d56e9f | 249 | int in_class; |
5f771d47 ILT |
250 | int indx ATTRIBUTE_UNUSED; |
251 | int numaux ATTRIBUTE_UNUSED; | |
252 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
253 | { |
254 | union internal_auxent *in = (union internal_auxent *) inp; | |
255 | ||
96d56e9f NC |
256 | if (in_class == C_BLOCK || in_class == C_FCN || ISFCN (type) |
257 | || ISTAG (in_class)) | |
252b5132 | 258 | { |
9bf609ec | 259 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -GO32_STUBSIZE); |
252b5132 RH |
260 | } |
261 | } | |
262 | ||
263 | static void | |
96d56e9f | 264 | adjust_aux_out_post (abfd, inp, type, in_class, indx, numaux, extp) |
5f771d47 | 265 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
266 | PTR inp; |
267 | int type; | |
96d56e9f | 268 | int in_class; |
5f771d47 ILT |
269 | int indx ATTRIBUTE_UNUSED; |
270 | int numaux ATTRIBUTE_UNUSED; | |
271 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
272 | { |
273 | union internal_auxent *in = (union internal_auxent *) inp; | |
274 | ||
96d56e9f NC |
275 | if (in_class == C_BLOCK || in_class == C_FCN || ISFCN (type) |
276 | || ISTAG (in_class)) | |
252b5132 | 277 | { |
9bf609ec | 278 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, GO32_STUBSIZE); |
252b5132 RH |
279 | } |
280 | } | |
281 | ||
246178f2 | 282 | /* That's the function, which creates the stub. There are |
252b5132 RH |
283 | different cases from where the stub is taken. |
284 | At first the environment variable $(GO32STUB) is checked and then | |
285 | $(STUB) if it was not set. | |
286 | If it exists and points to a valid stub the stub is taken from | |
287 | that file. This file can be also a whole executable file, because | |
288 | the stub is computed from the exe information at the start of that | |
289 | file. | |
290 | ||
291 | If there was any error, the standard stub (compiled in this file) | |
246178f2 | 292 | is taken. */ |
252b5132 RH |
293 | |
294 | static void | |
295 | create_go32_stub (abfd) | |
296 | bfd *abfd; | |
297 | { | |
246178f2 | 298 | /* Do it only once. */ |
9bf609ec | 299 | if (coff_data (abfd)->go32stub == NULL) |
252b5132 RH |
300 | { |
301 | char *stub; | |
302 | struct stat st; | |
303 | int f; | |
304 | unsigned char header[10]; | |
305 | char magic[8]; | |
dc810e39 AM |
306 | unsigned long coff_start; |
307 | long exe_start; | |
252b5132 | 308 | |
246178f2 | 309 | /* Check at first the environment variable $(GO32STUB). */ |
252b5132 | 310 | stub = getenv ("GO32STUB"); |
246178f2 | 311 | /* Now check the environment variable $(STUB). */ |
252b5132 RH |
312 | if (stub == NULL) |
313 | stub = getenv ("STUB"); | |
314 | if (stub == NULL) | |
315 | goto stub_end; | |
316 | if (stat (stub, &st) != 0) | |
317 | goto stub_end; | |
318 | #ifdef O_BINARY | |
319 | f = open (stub, O_RDONLY | O_BINARY); | |
320 | #else | |
321 | f = open (stub, O_RDONLY); | |
322 | #endif | |
323 | if (f < 0) | |
324 | goto stub_end; | |
325 | if (read (f, &header, sizeof (header)) < 0) | |
326 | { | |
327 | close (f); | |
328 | goto stub_end; | |
329 | } | |
246178f2 | 330 | if (_H (0) != 0x5a4d) /* It is not an exe file. */ |
252b5132 RH |
331 | { |
332 | close (f); | |
333 | goto stub_end; | |
334 | } | |
335 | /* Compute the size of the stub (it is every thing up | |
246178f2 | 336 | to the beginning of the coff image). */ |
252b5132 RH |
337 | coff_start = (long) _H (2) * 512L; |
338 | if (_H (1)) | |
339 | coff_start += (long) _H (1) - 512L; | |
340 | ||
341 | /* Currently there is only a fixed stub size of 2048 bytes | |
246178f2 | 342 | supported. */ |
252b5132 RH |
343 | if (coff_start != 2048) |
344 | { | |
345 | close (f); | |
346 | goto stub_end; | |
347 | } | |
348 | exe_start = _H (4) * 16; | |
dc810e39 | 349 | if ((long) lseek (f, exe_start, SEEK_SET) != exe_start) |
252b5132 RH |
350 | { |
351 | close (f); | |
352 | goto stub_end; | |
353 | } | |
354 | if (read (f, &magic, 8) != 8) | |
355 | { | |
356 | close (f); | |
357 | goto stub_end; | |
358 | } | |
0112cd26 | 359 | if (! CONST_STRNEQ (magic, "go32stub")) |
252b5132 RH |
360 | { |
361 | close (f); | |
362 | goto stub_end; | |
363 | } | |
246178f2 | 364 | /* Now we found a correct stub (hopefully). */ |
9bf609ec JK |
365 | coff_data (abfd)->go32stub = bfd_alloc (abfd, (bfd_size_type) coff_start); |
366 | if (coff_data (abfd)->go32stub == NULL) | |
252b5132 RH |
367 | { |
368 | close (f); | |
369 | return; | |
370 | } | |
371 | lseek (f, 0L, SEEK_SET); | |
9bf609ec | 372 | if ((unsigned long) read (f, coff_data (abfd)->go32stub, coff_start) |
252b5132 RH |
373 | != coff_start) |
374 | { | |
9bf609ec JK |
375 | bfd_release (abfd, coff_data (abfd)->go32stub); |
376 | coff_data (abfd)->go32stub = NULL; | |
252b5132 RH |
377 | } |
378 | close (f); | |
379 | } | |
380 | stub_end: | |
381 | /* There was something wrong above, so use now the standard builtin | |
246178f2 | 382 | stub. */ |
9bf609ec | 383 | if (coff_data (abfd)->go32stub == NULL) |
252b5132 | 384 | { |
9bf609ec JK |
385 | coff_data (abfd)->go32stub |
386 | = bfd_alloc (abfd, (bfd_size_type) GO32_STUBSIZE); | |
387 | if (coff_data (abfd)->go32stub == NULL) | |
246178f2 | 388 | return; |
9bf609ec | 389 | memcpy (coff_data (abfd)->go32stub, stub_bytes, GO32_STUBSIZE); |
252b5132 RH |
390 | } |
391 | } | |
392 | ||
393 | /* If ibfd was a stubbed coff image, copy the stub from that bfd | |
246178f2 | 394 | to the new obfd. */ |
252b5132 | 395 | |
b34976b6 | 396 | static bfd_boolean |
252b5132 RH |
397 | go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd) |
398 | bfd *ibfd; | |
399 | bfd *obfd; | |
400 | { | |
246178f2 | 401 | /* Check if both are the same targets. */ |
252b5132 | 402 | if (ibfd->xvec != obfd->xvec) |
b34976b6 | 403 | return TRUE; |
252b5132 | 404 | |
e39e47bd | 405 | /* Check if we have a source stub. */ |
9bf609ec | 406 | if (coff_data (ibfd)->go32stub == NULL) |
b34976b6 | 407 | return TRUE; |
252b5132 | 408 | |
e39e47bd JK |
409 | /* As adjust_filehdr_out_pre may get called only after this function, |
410 | optionally allocate the output stub. */ | |
9bf609ec JK |
411 | if (coff_data (obfd)->go32stub == NULL) |
412 | coff_data (obfd)->go32stub = bfd_alloc (obfd, | |
413 | (bfd_size_type) GO32_STUBSIZE); | |
e39e47bd | 414 | |
246178f2 | 415 | /* Now copy the stub. */ |
9bf609ec JK |
416 | if (coff_data (obfd)->go32stub != NULL) |
417 | memcpy (coff_data (obfd)->go32stub, coff_data (ibfd)->go32stub, | |
418 | GO32_STUBSIZE); | |
252b5132 | 419 | |
b34976b6 | 420 | return TRUE; |
252b5132 | 421 | } |
156f6ad8 JK |
422 | |
423 | /* coff_object_p only checks 2 bytes F_MAGIC at GO32_STUBSIZE inside the file | |
424 | which is too fragile. */ | |
425 | ||
426 | static const bfd_target * | |
427 | go32_check_format (bfd *abfd) | |
428 | { | |
429 | char mz[2]; | |
430 | ||
431 | if (bfd_bread (mz, 2, abfd) != 2 || mz[0] != 'M' || mz[1] != 'Z') | |
432 | { | |
433 | bfd_set_error (bfd_error_wrong_format); | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | if (bfd_seek (abfd, 0, SEEK_SET) != 0) | |
438 | return NULL; | |
439 | ||
440 | return coff_object_p (abfd); | |
441 | } |