Commit | Line | Data |
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a4f68544 | 1 | /* BFD back-end for Intel 386 COFF files (DJGPP variant with a stub). |
cd123cb7 NC |
2 | Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2006, 2007 |
3 | 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 | |
252b5132 RH |
57 | #include "bfd.h" |
58 | ||
246178f2 | 59 | /* At first the prototypes. */ |
252b5132 RH |
60 | |
61 | static void | |
246178f2 | 62 | adjust_filehdr_in_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 63 | static void |
246178f2 | 64 | adjust_filehdr_out_pre PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 65 | static void |
246178f2 | 66 | adjust_filehdr_out_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 67 | static void |
246178f2 | 68 | adjust_scnhdr_in_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 69 | static void |
246178f2 | 70 | adjust_scnhdr_out_pre PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 71 | static void |
246178f2 | 72 | adjust_scnhdr_out_post PARAMS ((bfd *, PTR, PTR)); |
252b5132 | 73 | static void |
246178f2 | 74 | adjust_aux_in_post PARAMS ((bfd *, PTR, int, int, int, int, PTR)); |
252b5132 | 75 | static void |
246178f2 | 76 | adjust_aux_out_pre PARAMS ((bfd *, PTR, int, int, int, int, PTR)); |
252b5132 | 77 | static void |
246178f2 | 78 | adjust_aux_out_post PARAMS ((bfd *, PTR, int, int, int, int, PTR)); |
252b5132 | 79 | static void |
246178f2 | 80 | create_go32_stub PARAMS ((bfd *)); |
252b5132 | 81 | |
246178f2 | 82 | /* All that ..._PRE and ...POST functions are called from the corresponding |
252b5132 | 83 | coff_swap... functions. The ...PRE functions are called at the beginning |
246178f2 | 84 | of the function and the ...POST functions at the end of the swap routines. */ |
252b5132 RH |
85 | |
86 | #define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post | |
87 | #define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre | |
88 | #define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post | |
89 | ||
90 | #define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post | |
91 | #define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre | |
92 | #define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post | |
93 | ||
94 | #define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post | |
95 | #define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre | |
96 | #define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post | |
97 | ||
b34976b6 | 98 | static bfd_boolean |
246178f2 | 99 | go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *)); |
252b5132 RH |
100 | |
101 | #define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data | |
102 | ||
103 | #include "coff-i386.c" | |
104 | ||
246178f2 | 105 | /* I hold in the usrdata the stub. */ |
252b5132 RH |
106 | #define bfd_coff_go32stub bfd_usrdata |
107 | ||
108 | /* This macro is used, because I cannot assume the endianess of the | |
246178f2 | 109 | host system. */ |
dc810e39 | 110 | #define _H(index) (H_GET_16 (abfd, (header+index*2))) |
252b5132 | 111 | |
252b5132 | 112 | /* These bytes are a 2048-byte DOS executable, which loads the COFF |
246178f2 | 113 | image into memory and then runs it. It is called 'stub'. */ |
252b5132 | 114 | |
246178f2 | 115 | static const unsigned char stub_bytes[STUBSIZE] = |
252b5132 RH |
116 | { |
117 | #include "go32stub.h" | |
118 | }; | |
119 | ||
120 | /* | |
121 | I have not commented each swap function below, because the | |
122 | technique is in any function the same. For the ...in function, | |
123 | all the pointers are adjusted by adding STUBSIZE and for the | |
124 | ...out function, it is subtracted first and after calling the | |
246178f2 | 125 | standard swap function it is reset to the old value. */ |
252b5132 RH |
126 | |
127 | /* This macro is used for adjusting the filepointers, which | |
246178f2 | 128 | is done only, if the pointer is nonzero. */ |
252b5132 RH |
129 | |
130 | #define ADJUST_VAL(val,diff) \ | |
131 | if (val != 0) val += diff | |
132 | ||
133 | static void | |
134 | adjust_filehdr_in_post (abfd, src, dst) | |
135 | bfd *abfd; | |
136 | PTR src; | |
137 | PTR dst; | |
138 | { | |
139 | FILHDR *filehdr_src = (FILHDR *) src; | |
140 | struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; | |
141 | ||
142 | ADJUST_VAL (filehdr_dst->f_symptr, STUBSIZE); | |
143 | ||
246178f2 | 144 | /* Save now the stub to be used later. */ |
dc810e39 | 145 | bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, (bfd_size_type) STUBSIZE); |
252b5132 RH |
146 | |
147 | /* Since this function returns no status, I do not set here | |
148 | any bfd_error_... | |
149 | That means, before the use of bfd_coff_go32stub (), this value | |
246178f2 | 150 | should be checked if it is != NULL. */ |
252b5132 RH |
151 | if (bfd_coff_go32stub (abfd) == NULL) |
152 | return; | |
153 | memcpy (bfd_coff_go32stub (abfd), filehdr_src->stub, STUBSIZE); | |
154 | } | |
155 | ||
156 | static void | |
157 | adjust_filehdr_out_pre (abfd, in, out) | |
158 | bfd *abfd; | |
159 | PTR in; | |
160 | PTR out; | |
161 | { | |
162 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
163 | FILHDR *filehdr_out = (FILHDR *) out; | |
164 | ||
246178f2 | 165 | /* Generate the stub. */ |
252b5132 RH |
166 | create_go32_stub (abfd); |
167 | ||
246178f2 | 168 | /* Copy the stub to the file header. */ |
252b5132 RH |
169 | if (bfd_coff_go32stub (abfd) != NULL) |
170 | memcpy (filehdr_out->stub, bfd_coff_go32stub (abfd), STUBSIZE); | |
171 | else | |
246178f2 | 172 | /* Use the default. */ |
252b5132 RH |
173 | memcpy (filehdr_out->stub, stub_bytes, STUBSIZE); |
174 | ||
175 | ADJUST_VAL (filehdr_in->f_symptr, -STUBSIZE); | |
176 | } | |
177 | ||
178 | static void | |
179 | adjust_filehdr_out_post (abfd, in, out) | |
5f771d47 | 180 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 181 | PTR in; |
5f771d47 | 182 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
183 | { |
184 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
246178f2 | 185 | /* Undo the above change. */ |
252b5132 RH |
186 | ADJUST_VAL (filehdr_in->f_symptr, STUBSIZE); |
187 | } | |
188 | ||
189 | static void | |
190 | adjust_scnhdr_in_post (abfd, ext, in) | |
5f771d47 ILT |
191 | bfd *abfd ATTRIBUTE_UNUSED; |
192 | PTR ext ATTRIBUTE_UNUSED; | |
252b5132 RH |
193 | PTR in; |
194 | { | |
195 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
196 | ||
197 | ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE); | |
198 | ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE); | |
199 | ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE); | |
200 | } | |
201 | ||
202 | static void | |
203 | adjust_scnhdr_out_pre (abfd, in, out) | |
5f771d47 | 204 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 205 | PTR in; |
5f771d47 | 206 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
207 | { |
208 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
209 | ||
210 | ADJUST_VAL (scnhdr_int->s_scnptr, -STUBSIZE); | |
211 | ADJUST_VAL (scnhdr_int->s_relptr, -STUBSIZE); | |
212 | ADJUST_VAL (scnhdr_int->s_lnnoptr, -STUBSIZE); | |
213 | } | |
214 | ||
215 | static void | |
216 | adjust_scnhdr_out_post (abfd, in, out) | |
5f771d47 | 217 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 218 | PTR in; |
5f771d47 | 219 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
220 | { |
221 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
222 | ||
223 | ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE); | |
224 | ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE); | |
225 | ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE); | |
226 | } | |
227 | ||
228 | static void | |
229 | adjust_aux_in_post (abfd, ext1, type, class, indx, numaux, in1) | |
5f771d47 ILT |
230 | bfd *abfd ATTRIBUTE_UNUSED; |
231 | PTR ext1 ATTRIBUTE_UNUSED; | |
252b5132 RH |
232 | int type; |
233 | int class; | |
5f771d47 ILT |
234 | int indx ATTRIBUTE_UNUSED; |
235 | int numaux ATTRIBUTE_UNUSED; | |
252b5132 RH |
236 | PTR in1; |
237 | { | |
238 | union internal_auxent *in = (union internal_auxent *) in1; | |
239 | ||
240 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
241 | { | |
242 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE); | |
243 | } | |
244 | } | |
245 | ||
246 | static void | |
247 | adjust_aux_out_pre (abfd, inp, type, class, indx, numaux, extp) | |
5f771d47 | 248 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
249 | PTR inp; |
250 | int type; | |
251 | int class; | |
5f771d47 ILT |
252 | int indx ATTRIBUTE_UNUSED; |
253 | int numaux ATTRIBUTE_UNUSED; | |
254 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
255 | { |
256 | union internal_auxent *in = (union internal_auxent *) inp; | |
257 | ||
258 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
259 | { | |
260 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -STUBSIZE); | |
261 | } | |
262 | } | |
263 | ||
264 | static void | |
265 | adjust_aux_out_post (abfd, inp, type, class, indx, numaux, extp) | |
5f771d47 | 266 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
267 | PTR inp; |
268 | int type; | |
269 | int class; | |
5f771d47 ILT |
270 | int indx ATTRIBUTE_UNUSED; |
271 | int numaux ATTRIBUTE_UNUSED; | |
272 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
273 | { |
274 | union internal_auxent *in = (union internal_auxent *) inp; | |
275 | ||
276 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
277 | { | |
278 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE); | |
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. */ |
252b5132 RH |
299 | if (bfd_coff_go32stub (abfd) == NULL) |
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). */ |
dc810e39 AM |
365 | bfd_coff_go32stub (abfd) |
366 | = (PTR) bfd_alloc (abfd, (bfd_size_type) coff_start); | |
252b5132 RH |
367 | if (bfd_coff_go32stub (abfd) == NULL) |
368 | { | |
369 | close (f); | |
370 | return; | |
371 | } | |
372 | lseek (f, 0L, SEEK_SET); | |
373 | if ((unsigned long) read (f, bfd_coff_go32stub (abfd), coff_start) | |
374 | != coff_start) | |
375 | { | |
376 | bfd_release (abfd, bfd_coff_go32stub (abfd)); | |
377 | bfd_coff_go32stub (abfd) = NULL; | |
378 | } | |
379 | close (f); | |
380 | } | |
381 | stub_end: | |
382 | /* There was something wrong above, so use now the standard builtin | |
246178f2 | 383 | stub. */ |
252b5132 RH |
384 | if (bfd_coff_go32stub (abfd) == NULL) |
385 | { | |
dc810e39 AM |
386 | bfd_coff_go32stub (abfd) |
387 | = (PTR) bfd_alloc (abfd, (bfd_size_type) STUBSIZE); | |
252b5132 | 388 | if (bfd_coff_go32stub (abfd) == NULL) |
246178f2 | 389 | return; |
252b5132 RH |
390 | memcpy (bfd_coff_go32stub (abfd), stub_bytes, STUBSIZE); |
391 | } | |
392 | } | |
393 | ||
394 | /* If ibfd was a stubbed coff image, copy the stub from that bfd | |
246178f2 | 395 | to the new obfd. */ |
252b5132 | 396 | |
b34976b6 | 397 | static bfd_boolean |
252b5132 RH |
398 | go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd) |
399 | bfd *ibfd; | |
400 | bfd *obfd; | |
401 | { | |
246178f2 | 402 | /* Check if both are the same targets. */ |
252b5132 | 403 | if (ibfd->xvec != obfd->xvec) |
b34976b6 | 404 | return TRUE; |
252b5132 | 405 | |
246178f2 | 406 | /* Check if both have a valid stub. */ |
252b5132 RH |
407 | if (bfd_coff_go32stub (ibfd) == NULL |
408 | || bfd_coff_go32stub (obfd) == NULL) | |
b34976b6 | 409 | return TRUE; |
252b5132 | 410 | |
246178f2 | 411 | /* Now copy the stub. */ |
252b5132 RH |
412 | memcpy (bfd_coff_go32stub (obfd), bfd_coff_go32stub (ibfd), STUBSIZE); |
413 | ||
b34976b6 | 414 | return TRUE; |
252b5132 | 415 | } |