Commit | Line | Data |
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a4f68544 NC |
1 | /* BFD back-end for Intel 386 COFF files (DJGPP variant with a stub). |
2 | Copyright 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. | |
252b5132 RH |
3 | Written by Robert Hoehne. |
4 | ||
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* This file handles now also stubbed coff images. The stub is a small | |
22 | DOS executable program before the coff image to load it in memory | |
23 | and execute it. This is needed, because DOS cannot run coff files. | |
24 | ||
25 | All the functions below are called by the corresponding functions | |
26 | from coffswap.h. | |
27 | The only thing what they do is to adjust the information stored in | |
28 | the COFF file which are offset into the file. | |
29 | This is needed, because DJGPP uses a very special way to load and run | |
30 | the coff image. It loads the image in memory and assumes then, that the | |
31 | image had no stub by using the filepointers as pointers in the coff | |
32 | image and NOT in the file. | |
33 | ||
34 | To be compatible with any existing executables I have fixed this | |
35 | here and NOT in the DJGPP startup code. | |
36 | */ | |
37 | ||
38 | #define TARGET_SYM go32stubbedcoff_vec | |
39 | #define TARGET_NAME "coff-go32-exe" | |
40 | #define TARGET_UNDERSCORE '_' | |
41 | #define COFF_GO32_EXE | |
242eabea ILT |
42 | #define COFF_LONG_SECTION_NAMES |
43 | #define COFF_SUPPORT_GNU_LINKONCE | |
a4f68544 | 44 | #define COFF_LONG_FILENAMES |
252b5132 | 45 | |
5dccc1dd ILT |
46 | #define COFF_SECTION_ALIGNMENT_ENTRIES \ |
47 | { COFF_SECTION_NAME_EXACT_MATCH (".data"), \ | |
48 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \ | |
49 | { COFF_SECTION_NAME_EXACT_MATCH (".text"), \ | |
a7bda527 DD |
50 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \ |
51 | { COFF_SECTION_NAME_PARTIAL_MATCH (".debug"), \ | |
26cd54bf | 52 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 }, \ |
4f6fbb1a | 53 | { COFF_SECTION_NAME_PARTIAL_MATCH (".gnu.linkonce.wi"), \ |
a7bda527 | 54 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 } |
5dccc1dd | 55 | |
252b5132 RH |
56 | #include "bfd.h" |
57 | ||
58 | /* At first the prototypes */ | |
59 | ||
60 | static void | |
61 | adjust_filehdr_in_post PARAMS ((bfd * abfd, PTR src, PTR dst)); | |
62 | static void | |
63 | adjust_filehdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out)); | |
64 | static void | |
65 | adjust_filehdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out)); | |
66 | ||
67 | static void | |
68 | adjust_scnhdr_in_post PARAMS ((bfd * abfd, PTR ext, PTR in)); | |
69 | static void | |
70 | adjust_scnhdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out)); | |
71 | static void | |
72 | adjust_scnhdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out)); | |
73 | ||
74 | static void | |
75 | adjust_aux_in_post PARAMS ((bfd * abfd, PTR ext1, int type, int class, int indx, | |
76 | int numaux, PTR in1)); | |
77 | static void | |
78 | adjust_aux_out_pre PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx, | |
79 | int numaux, PTR extp)); | |
80 | static void | |
81 | adjust_aux_out_post PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx, | |
82 | int numaux, PTR extp)); | |
83 | ||
84 | static void | |
85 | create_go32_stub PARAMS ((bfd * abfd)); | |
86 | ||
87 | /* | |
88 | All that ..._PRE and ...POST functions are called from the corresponding | |
89 | coff_swap... functions. The ...PRE functions are called at the beginning | |
90 | of the function and the ...POST functions at the end of the swap routines. | |
91 | */ | |
92 | ||
93 | #define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post | |
94 | #define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre | |
95 | #define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post | |
96 | ||
97 | #define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post | |
98 | #define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre | |
99 | #define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post | |
100 | ||
101 | #define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post | |
102 | #define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre | |
103 | #define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post | |
104 | ||
105 | static boolean | |
106 | go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd * ibfd, bfd * obfd)); | |
107 | ||
108 | #define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data | |
109 | ||
110 | #include "coff-i386.c" | |
111 | ||
112 | /* I hold in the usrdata the stub */ | |
113 | #define bfd_coff_go32stub bfd_usrdata | |
114 | ||
115 | /* This macro is used, because I cannot assume the endianess of the | |
116 | host system */ | |
dc810e39 | 117 | #define _H(index) (H_GET_16 (abfd, (header+index*2))) |
252b5132 | 118 | |
252b5132 RH |
119 | /* These bytes are a 2048-byte DOS executable, which loads the COFF |
120 | image into memory and then runs it. It is called 'stub' */ | |
121 | ||
122 | static unsigned char stub_bytes[STUBSIZE] = | |
123 | { | |
124 | #include "go32stub.h" | |
125 | }; | |
126 | ||
127 | /* | |
128 | I have not commented each swap function below, because the | |
129 | technique is in any function the same. For the ...in function, | |
130 | all the pointers are adjusted by adding STUBSIZE and for the | |
131 | ...out function, it is subtracted first and after calling the | |
132 | standard swap function it is reset to the old value */ | |
133 | ||
134 | /* This macro is used for adjusting the filepointers, which | |
135 | is done only, if the pointer is nonzero */ | |
136 | ||
137 | #define ADJUST_VAL(val,diff) \ | |
138 | if (val != 0) val += diff | |
139 | ||
140 | static void | |
141 | adjust_filehdr_in_post (abfd, src, dst) | |
142 | bfd *abfd; | |
143 | PTR src; | |
144 | PTR dst; | |
145 | { | |
146 | FILHDR *filehdr_src = (FILHDR *) src; | |
147 | struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; | |
148 | ||
149 | ADJUST_VAL (filehdr_dst->f_symptr, STUBSIZE); | |
150 | ||
151 | /* Save now the stub to be used later */ | |
dc810e39 | 152 | bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, (bfd_size_type) STUBSIZE); |
252b5132 RH |
153 | |
154 | /* Since this function returns no status, I do not set here | |
155 | any bfd_error_... | |
156 | That means, before the use of bfd_coff_go32stub (), this value | |
157 | should be checked if it is != NULL */ | |
158 | if (bfd_coff_go32stub (abfd) == NULL) | |
159 | return; | |
160 | memcpy (bfd_coff_go32stub (abfd), filehdr_src->stub, STUBSIZE); | |
161 | } | |
162 | ||
163 | static void | |
164 | adjust_filehdr_out_pre (abfd, in, out) | |
165 | bfd *abfd; | |
166 | PTR in; | |
167 | PTR out; | |
168 | { | |
169 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
170 | FILHDR *filehdr_out = (FILHDR *) out; | |
171 | ||
172 | /* Generate the stub */ | |
173 | create_go32_stub (abfd); | |
174 | ||
175 | /* Copy the stub to the file header */ | |
176 | if (bfd_coff_go32stub (abfd) != NULL) | |
177 | memcpy (filehdr_out->stub, bfd_coff_go32stub (abfd), STUBSIZE); | |
178 | else | |
179 | /* use the default */ | |
180 | memcpy (filehdr_out->stub, stub_bytes, STUBSIZE); | |
181 | ||
182 | ADJUST_VAL (filehdr_in->f_symptr, -STUBSIZE); | |
183 | } | |
184 | ||
185 | static void | |
186 | adjust_filehdr_out_post (abfd, in, out) | |
5f771d47 | 187 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 188 | PTR in; |
5f771d47 | 189 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
190 | { |
191 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
192 | /* undo the above change */ | |
193 | ADJUST_VAL (filehdr_in->f_symptr, STUBSIZE); | |
194 | } | |
195 | ||
196 | static void | |
197 | adjust_scnhdr_in_post (abfd, ext, in) | |
5f771d47 ILT |
198 | bfd *abfd ATTRIBUTE_UNUSED; |
199 | PTR ext ATTRIBUTE_UNUSED; | |
252b5132 RH |
200 | PTR in; |
201 | { | |
202 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
203 | ||
204 | ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE); | |
205 | ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE); | |
206 | ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE); | |
207 | } | |
208 | ||
209 | static void | |
210 | adjust_scnhdr_out_pre (abfd, in, out) | |
5f771d47 | 211 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 212 | PTR in; |
5f771d47 | 213 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
214 | { |
215 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
216 | ||
217 | ADJUST_VAL (scnhdr_int->s_scnptr, -STUBSIZE); | |
218 | ADJUST_VAL (scnhdr_int->s_relptr, -STUBSIZE); | |
219 | ADJUST_VAL (scnhdr_int->s_lnnoptr, -STUBSIZE); | |
220 | } | |
221 | ||
222 | static void | |
223 | adjust_scnhdr_out_post (abfd, in, out) | |
5f771d47 | 224 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 225 | PTR in; |
5f771d47 | 226 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
227 | { |
228 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
229 | ||
230 | ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE); | |
231 | ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE); | |
232 | ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE); | |
233 | } | |
234 | ||
235 | static void | |
236 | adjust_aux_in_post (abfd, ext1, type, class, indx, numaux, in1) | |
5f771d47 ILT |
237 | bfd *abfd ATTRIBUTE_UNUSED; |
238 | PTR ext1 ATTRIBUTE_UNUSED; | |
252b5132 RH |
239 | int type; |
240 | int class; | |
5f771d47 ILT |
241 | int indx ATTRIBUTE_UNUSED; |
242 | int numaux ATTRIBUTE_UNUSED; | |
252b5132 RH |
243 | PTR in1; |
244 | { | |
245 | union internal_auxent *in = (union internal_auxent *) in1; | |
246 | ||
247 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
248 | { | |
249 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE); | |
250 | } | |
251 | } | |
252 | ||
253 | static void | |
254 | adjust_aux_out_pre (abfd, inp, type, class, indx, numaux, extp) | |
5f771d47 | 255 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
256 | PTR inp; |
257 | int type; | |
258 | int class; | |
5f771d47 ILT |
259 | int indx ATTRIBUTE_UNUSED; |
260 | int numaux ATTRIBUTE_UNUSED; | |
261 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
262 | { |
263 | union internal_auxent *in = (union internal_auxent *) inp; | |
264 | ||
265 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
266 | { | |
267 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -STUBSIZE); | |
268 | } | |
269 | } | |
270 | ||
271 | static void | |
272 | adjust_aux_out_post (abfd, inp, type, class, indx, numaux, extp) | |
5f771d47 | 273 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
274 | PTR inp; |
275 | int type; | |
276 | int class; | |
5f771d47 ILT |
277 | int indx ATTRIBUTE_UNUSED; |
278 | int numaux ATTRIBUTE_UNUSED; | |
279 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
280 | { |
281 | union internal_auxent *in = (union internal_auxent *) inp; | |
282 | ||
283 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
284 | { | |
285 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE); | |
286 | } | |
287 | } | |
288 | ||
289 | /* | |
290 | That's the function, which creates the stub. There are | |
291 | different cases from where the stub is taken. | |
292 | At first the environment variable $(GO32STUB) is checked and then | |
293 | $(STUB) if it was not set. | |
294 | If it exists and points to a valid stub the stub is taken from | |
295 | that file. This file can be also a whole executable file, because | |
296 | the stub is computed from the exe information at the start of that | |
297 | file. | |
298 | ||
299 | If there was any error, the standard stub (compiled in this file) | |
300 | is taken. | |
301 | */ | |
302 | ||
303 | static void | |
304 | create_go32_stub (abfd) | |
305 | bfd *abfd; | |
306 | { | |
307 | /* Do it only once */ | |
308 | if (bfd_coff_go32stub (abfd) == NULL) | |
309 | { | |
310 | char *stub; | |
311 | struct stat st; | |
312 | int f; | |
313 | unsigned char header[10]; | |
314 | char magic[8]; | |
dc810e39 AM |
315 | unsigned long coff_start; |
316 | long exe_start; | |
252b5132 RH |
317 | |
318 | /* Check at first the environment variable $(GO32STUB) */ | |
319 | stub = getenv ("GO32STUB"); | |
320 | /* Now check the environment variable $(STUB) */ | |
321 | if (stub == NULL) | |
322 | stub = getenv ("STUB"); | |
323 | if (stub == NULL) | |
324 | goto stub_end; | |
325 | if (stat (stub, &st) != 0) | |
326 | goto stub_end; | |
327 | #ifdef O_BINARY | |
328 | f = open (stub, O_RDONLY | O_BINARY); | |
329 | #else | |
330 | f = open (stub, O_RDONLY); | |
331 | #endif | |
332 | if (f < 0) | |
333 | goto stub_end; | |
334 | if (read (f, &header, sizeof (header)) < 0) | |
335 | { | |
336 | close (f); | |
337 | goto stub_end; | |
338 | } | |
339 | if (_H (0) != 0x5a4d) /* it is not an exe file */ | |
340 | { | |
341 | close (f); | |
342 | goto stub_end; | |
343 | } | |
344 | /* Compute the size of the stub (it is every thing up | |
345 | to the beginning of the coff image) */ | |
346 | coff_start = (long) _H (2) * 512L; | |
347 | if (_H (1)) | |
348 | coff_start += (long) _H (1) - 512L; | |
349 | ||
350 | /* Currently there is only a fixed stub size of 2048 bytes | |
351 | supported */ | |
352 | if (coff_start != 2048) | |
353 | { | |
354 | close (f); | |
355 | goto stub_end; | |
356 | } | |
357 | exe_start = _H (4) * 16; | |
dc810e39 | 358 | if ((long) lseek (f, exe_start, SEEK_SET) != exe_start) |
252b5132 RH |
359 | { |
360 | close (f); | |
361 | goto stub_end; | |
362 | } | |
363 | if (read (f, &magic, 8) != 8) | |
364 | { | |
365 | close (f); | |
366 | goto stub_end; | |
367 | } | |
368 | if (memcmp (magic, "go32stub", 8) != 0) | |
369 | { | |
370 | close (f); | |
371 | goto stub_end; | |
372 | } | |
373 | /* Now we found a correct stub (hopefully) */ | |
dc810e39 AM |
374 | bfd_coff_go32stub (abfd) |
375 | = (PTR) bfd_alloc (abfd, (bfd_size_type) coff_start); | |
252b5132 RH |
376 | if (bfd_coff_go32stub (abfd) == NULL) |
377 | { | |
378 | close (f); | |
379 | return; | |
380 | } | |
381 | lseek (f, 0L, SEEK_SET); | |
382 | if ((unsigned long) read (f, bfd_coff_go32stub (abfd), coff_start) | |
383 | != coff_start) | |
384 | { | |
385 | bfd_release (abfd, bfd_coff_go32stub (abfd)); | |
386 | bfd_coff_go32stub (abfd) = NULL; | |
387 | } | |
388 | close (f); | |
389 | } | |
390 | stub_end: | |
391 | /* There was something wrong above, so use now the standard builtin | |
392 | stub */ | |
393 | if (bfd_coff_go32stub (abfd) == NULL) | |
394 | { | |
dc810e39 AM |
395 | bfd_coff_go32stub (abfd) |
396 | = (PTR) bfd_alloc (abfd, (bfd_size_type) STUBSIZE); | |
252b5132 RH |
397 | if (bfd_coff_go32stub (abfd) == NULL) |
398 | { | |
399 | return; | |
400 | } | |
401 | ||
402 | memcpy (bfd_coff_go32stub (abfd), stub_bytes, STUBSIZE); | |
403 | } | |
404 | } | |
405 | ||
406 | /* If ibfd was a stubbed coff image, copy the stub from that bfd | |
407 | to the new obfd. | |
408 | */ | |
409 | ||
410 | static boolean | |
411 | go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd) | |
412 | bfd *ibfd; | |
413 | bfd *obfd; | |
414 | { | |
415 | /* check if both are the same targets */ | |
416 | if (ibfd->xvec != obfd->xvec) | |
417 | return true; | |
418 | ||
419 | /* check if both have a valid stub */ | |
420 | if (bfd_coff_go32stub (ibfd) == NULL | |
421 | || bfd_coff_go32stub (obfd) == NULL) | |
422 | return true; | |
423 | ||
424 | /* Now copy the stub */ | |
425 | memcpy (bfd_coff_go32stub (obfd), bfd_coff_go32stub (ibfd), STUBSIZE); | |
426 | ||
427 | return true; | |
428 | } |