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252b5132 | 1 | /* BFD back-end for Intel 386 COFF files (go32 variant with a stub). |
5f771d47 | 2 | Copyright 1997, 1998, 1999 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 | |
252b5132 | 44 | |
5dccc1dd ILT |
45 | #define COFF_SECTION_ALIGNMENT_ENTRIES \ |
46 | { COFF_SECTION_NAME_EXACT_MATCH (".data"), \ | |
47 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \ | |
48 | { COFF_SECTION_NAME_EXACT_MATCH (".text"), \ | |
49 | COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 } | |
50 | ||
252b5132 RH |
51 | #include "bfd.h" |
52 | ||
53 | /* At first the prototypes */ | |
54 | ||
55 | static void | |
56 | adjust_filehdr_in_post PARAMS ((bfd * abfd, PTR src, PTR dst)); | |
57 | static void | |
58 | adjust_filehdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out)); | |
59 | static void | |
60 | adjust_filehdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out)); | |
61 | ||
62 | static void | |
63 | adjust_scnhdr_in_post PARAMS ((bfd * abfd, PTR ext, PTR in)); | |
64 | static void | |
65 | adjust_scnhdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out)); | |
66 | static void | |
67 | adjust_scnhdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out)); | |
68 | ||
69 | static void | |
70 | adjust_aux_in_post PARAMS ((bfd * abfd, PTR ext1, int type, int class, int indx, | |
71 | int numaux, PTR in1)); | |
72 | static void | |
73 | adjust_aux_out_pre PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx, | |
74 | int numaux, PTR extp)); | |
75 | static void | |
76 | adjust_aux_out_post PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx, | |
77 | int numaux, PTR extp)); | |
78 | ||
79 | static void | |
80 | create_go32_stub PARAMS ((bfd * abfd)); | |
81 | ||
82 | /* | |
83 | All that ..._PRE and ...POST functions are called from the corresponding | |
84 | coff_swap... functions. The ...PRE functions are called at the beginning | |
85 | of the function and the ...POST functions at the end of the swap routines. | |
86 | */ | |
87 | ||
88 | #define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post | |
89 | #define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre | |
90 | #define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post | |
91 | ||
92 | #define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post | |
93 | #define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre | |
94 | #define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post | |
95 | ||
96 | #define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post | |
97 | #define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre | |
98 | #define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post | |
99 | ||
100 | static boolean | |
101 | go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd * ibfd, bfd * obfd)); | |
102 | ||
103 | #define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data | |
104 | ||
105 | #include "coff-i386.c" | |
106 | ||
107 | /* I hold in the usrdata the stub */ | |
108 | #define bfd_coff_go32stub bfd_usrdata | |
109 | ||
110 | /* This macro is used, because I cannot assume the endianess of the | |
111 | host system */ | |
112 | #define _H(index) (bfd_h_get_16(abfd, (bfd_byte *)(header+index*2))) | |
113 | ||
252b5132 RH |
114 | /* These bytes are a 2048-byte DOS executable, which loads the COFF |
115 | image into memory and then runs it. It is called 'stub' */ | |
116 | ||
117 | static unsigned char stub_bytes[STUBSIZE] = | |
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, | |
125 | all the pointers are adjusted by adding STUBSIZE and for the | |
126 | ...out function, it is subtracted first and after calling the | |
127 | standard swap function it is reset to the old value */ | |
128 | ||
129 | /* This macro is used for adjusting the filepointers, which | |
130 | is done only, if the pointer is nonzero */ | |
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) | |
137 | bfd *abfd; | |
138 | PTR src; | |
139 | PTR dst; | |
140 | { | |
141 | FILHDR *filehdr_src = (FILHDR *) src; | |
142 | struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; | |
143 | ||
144 | ADJUST_VAL (filehdr_dst->f_symptr, STUBSIZE); | |
145 | ||
146 | /* Save now the stub to be used later */ | |
147 | bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, STUBSIZE); | |
148 | ||
149 | /* Since this function returns no status, I do not set here | |
150 | any bfd_error_... | |
151 | That means, before the use of bfd_coff_go32stub (), this value | |
152 | should be checked if it is != NULL */ | |
153 | if (bfd_coff_go32stub (abfd) == NULL) | |
154 | return; | |
155 | memcpy (bfd_coff_go32stub (abfd), filehdr_src->stub, STUBSIZE); | |
156 | } | |
157 | ||
158 | static void | |
159 | adjust_filehdr_out_pre (abfd, in, out) | |
160 | bfd *abfd; | |
161 | PTR in; | |
162 | PTR out; | |
163 | { | |
164 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
165 | FILHDR *filehdr_out = (FILHDR *) out; | |
166 | ||
167 | /* Generate the stub */ | |
168 | create_go32_stub (abfd); | |
169 | ||
170 | /* Copy the stub to the file header */ | |
171 | if (bfd_coff_go32stub (abfd) != NULL) | |
172 | memcpy (filehdr_out->stub, bfd_coff_go32stub (abfd), STUBSIZE); | |
173 | else | |
174 | /* use the default */ | |
175 | memcpy (filehdr_out->stub, stub_bytes, STUBSIZE); | |
176 | ||
177 | ADJUST_VAL (filehdr_in->f_symptr, -STUBSIZE); | |
178 | } | |
179 | ||
180 | static void | |
181 | adjust_filehdr_out_post (abfd, in, out) | |
5f771d47 | 182 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 183 | PTR in; |
5f771d47 | 184 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
185 | { |
186 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
187 | /* undo the above change */ | |
188 | ADJUST_VAL (filehdr_in->f_symptr, STUBSIZE); | |
189 | } | |
190 | ||
191 | static void | |
192 | adjust_scnhdr_in_post (abfd, ext, in) | |
5f771d47 ILT |
193 | bfd *abfd ATTRIBUTE_UNUSED; |
194 | PTR ext ATTRIBUTE_UNUSED; | |
252b5132 RH |
195 | PTR in; |
196 | { | |
197 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
198 | ||
199 | ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE); | |
200 | ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE); | |
201 | ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE); | |
202 | } | |
203 | ||
204 | static void | |
205 | adjust_scnhdr_out_pre (abfd, in, out) | |
5f771d47 | 206 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 207 | PTR in; |
5f771d47 | 208 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
209 | { |
210 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
211 | ||
212 | ADJUST_VAL (scnhdr_int->s_scnptr, -STUBSIZE); | |
213 | ADJUST_VAL (scnhdr_int->s_relptr, -STUBSIZE); | |
214 | ADJUST_VAL (scnhdr_int->s_lnnoptr, -STUBSIZE); | |
215 | } | |
216 | ||
217 | static void | |
218 | adjust_scnhdr_out_post (abfd, in, out) | |
5f771d47 | 219 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 220 | PTR in; |
5f771d47 | 221 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
222 | { |
223 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
224 | ||
225 | ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE); | |
226 | ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE); | |
227 | ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE); | |
228 | } | |
229 | ||
230 | static void | |
231 | adjust_aux_in_post (abfd, ext1, type, class, indx, numaux, in1) | |
5f771d47 ILT |
232 | bfd *abfd ATTRIBUTE_UNUSED; |
233 | PTR ext1 ATTRIBUTE_UNUSED; | |
252b5132 RH |
234 | int type; |
235 | int class; | |
5f771d47 ILT |
236 | int indx ATTRIBUTE_UNUSED; |
237 | int numaux ATTRIBUTE_UNUSED; | |
252b5132 RH |
238 | PTR in1; |
239 | { | |
240 | union internal_auxent *in = (union internal_auxent *) in1; | |
241 | ||
242 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
243 | { | |
244 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE); | |
245 | } | |
246 | } | |
247 | ||
248 | static void | |
249 | adjust_aux_out_pre (abfd, inp, type, class, indx, numaux, extp) | |
5f771d47 | 250 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
251 | PTR inp; |
252 | int type; | |
253 | int class; | |
5f771d47 ILT |
254 | int indx ATTRIBUTE_UNUSED; |
255 | int numaux ATTRIBUTE_UNUSED; | |
256 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
257 | { |
258 | union internal_auxent *in = (union internal_auxent *) inp; | |
259 | ||
260 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
261 | { | |
262 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -STUBSIZE); | |
263 | } | |
264 | } | |
265 | ||
266 | static void | |
267 | adjust_aux_out_post (abfd, inp, type, class, indx, numaux, extp) | |
5f771d47 | 268 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
269 | PTR inp; |
270 | int type; | |
271 | int class; | |
5f771d47 ILT |
272 | int indx ATTRIBUTE_UNUSED; |
273 | int numaux ATTRIBUTE_UNUSED; | |
274 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
275 | { |
276 | union internal_auxent *in = (union internal_auxent *) inp; | |
277 | ||
278 | if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class)) | |
279 | { | |
280 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE); | |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | That's the function, which creates the stub. There are | |
286 | different cases from where the stub is taken. | |
287 | At first the environment variable $(GO32STUB) is checked and then | |
288 | $(STUB) if it was not set. | |
289 | If it exists and points to a valid stub the stub is taken from | |
290 | that file. This file can be also a whole executable file, because | |
291 | the stub is computed from the exe information at the start of that | |
292 | file. | |
293 | ||
294 | If there was any error, the standard stub (compiled in this file) | |
295 | is taken. | |
296 | */ | |
297 | ||
298 | static void | |
299 | create_go32_stub (abfd) | |
300 | bfd *abfd; | |
301 | { | |
302 | /* Do it only once */ | |
303 | if (bfd_coff_go32stub (abfd) == NULL) | |
304 | { | |
305 | char *stub; | |
306 | struct stat st; | |
307 | int f; | |
308 | unsigned char header[10]; | |
309 | char magic[8]; | |
310 | unsigned long coff_start, exe_start; | |
311 | ||
312 | /* Check at first the environment variable $(GO32STUB) */ | |
313 | stub = getenv ("GO32STUB"); | |
314 | /* Now check the environment variable $(STUB) */ | |
315 | if (stub == NULL) | |
316 | stub = getenv ("STUB"); | |
317 | if (stub == NULL) | |
318 | goto stub_end; | |
319 | if (stat (stub, &st) != 0) | |
320 | goto stub_end; | |
321 | #ifdef O_BINARY | |
322 | f = open (stub, O_RDONLY | O_BINARY); | |
323 | #else | |
324 | f = open (stub, O_RDONLY); | |
325 | #endif | |
326 | if (f < 0) | |
327 | goto stub_end; | |
328 | if (read (f, &header, sizeof (header)) < 0) | |
329 | { | |
330 | close (f); | |
331 | goto stub_end; | |
332 | } | |
333 | if (_H (0) != 0x5a4d) /* it is not an exe file */ | |
334 | { | |
335 | close (f); | |
336 | goto stub_end; | |
337 | } | |
338 | /* Compute the size of the stub (it is every thing up | |
339 | to the beginning of the coff image) */ | |
340 | coff_start = (long) _H (2) * 512L; | |
341 | if (_H (1)) | |
342 | coff_start += (long) _H (1) - 512L; | |
343 | ||
344 | /* Currently there is only a fixed stub size of 2048 bytes | |
345 | supported */ | |
346 | if (coff_start != 2048) | |
347 | { | |
348 | close (f); | |
349 | goto stub_end; | |
350 | } | |
351 | exe_start = _H (4) * 16; | |
352 | if ((unsigned long) lseek (f, exe_start, SEEK_SET) != exe_start) | |
353 | { | |
354 | close (f); | |
355 | goto stub_end; | |
356 | } | |
357 | if (read (f, &magic, 8) != 8) | |
358 | { | |
359 | close (f); | |
360 | goto stub_end; | |
361 | } | |
362 | if (memcmp (magic, "go32stub", 8) != 0) | |
363 | { | |
364 | close (f); | |
365 | goto stub_end; | |
366 | } | |
367 | /* Now we found a correct stub (hopefully) */ | |
368 | bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, coff_start); | |
369 | if (bfd_coff_go32stub (abfd) == NULL) | |
370 | { | |
371 | close (f); | |
372 | return; | |
373 | } | |
374 | lseek (f, 0L, SEEK_SET); | |
375 | if ((unsigned long) read (f, bfd_coff_go32stub (abfd), coff_start) | |
376 | != coff_start) | |
377 | { | |
378 | bfd_release (abfd, bfd_coff_go32stub (abfd)); | |
379 | bfd_coff_go32stub (abfd) = NULL; | |
380 | } | |
381 | close (f); | |
382 | } | |
383 | stub_end: | |
384 | /* There was something wrong above, so use now the standard builtin | |
385 | stub */ | |
386 | if (bfd_coff_go32stub (abfd) == NULL) | |
387 | { | |
388 | bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, STUBSIZE); | |
389 | if (bfd_coff_go32stub (abfd) == NULL) | |
390 | { | |
391 | return; | |
392 | } | |
393 | ||
394 | memcpy (bfd_coff_go32stub (abfd), stub_bytes, STUBSIZE); | |
395 | } | |
396 | } | |
397 | ||
398 | /* If ibfd was a stubbed coff image, copy the stub from that bfd | |
399 | to the new obfd. | |
400 | */ | |
401 | ||
402 | static boolean | |
403 | go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd) | |
404 | bfd *ibfd; | |
405 | bfd *obfd; | |
406 | { | |
407 | /* check if both are the same targets */ | |
408 | if (ibfd->xvec != obfd->xvec) | |
409 | return true; | |
410 | ||
411 | /* check if both have a valid stub */ | |
412 | if (bfd_coff_go32stub (ibfd) == NULL | |
413 | || bfd_coff_go32stub (obfd) == NULL) | |
414 | return true; | |
415 | ||
416 | /* Now copy the stub */ | |
417 | memcpy (bfd_coff_go32stub (obfd), bfd_coff_go32stub (ibfd), STUBSIZE); | |
418 | ||
419 | return true; | |
420 | } |