Commit | Line | Data |
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a4f68544 | 1 | /* BFD back-end for Intel 386 COFF files (DJGPP variant with a stub). |
aa820537 | 2 | Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007, 2009 |
cd123cb7 | 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 | ||
252b5132 | 105 | /* This macro is used, because I cannot assume the endianess of the |
246178f2 | 106 | host system. */ |
dc810e39 | 107 | #define _H(index) (H_GET_16 (abfd, (header+index*2))) |
252b5132 | 108 | |
252b5132 | 109 | /* These bytes are a 2048-byte DOS executable, which loads the COFF |
246178f2 | 110 | image into memory and then runs it. It is called 'stub'. */ |
252b5132 | 111 | |
9bf609ec | 112 | static const unsigned char stub_bytes[GO32_STUBSIZE] = |
252b5132 RH |
113 | { |
114 | #include "go32stub.h" | |
115 | }; | |
116 | ||
117 | /* | |
118 | I have not commented each swap function below, because the | |
119 | technique is in any function the same. For the ...in function, | |
9bf609ec | 120 | all the pointers are adjusted by adding GO32_STUBSIZE and for the |
252b5132 | 121 | ...out function, it is subtracted first and after calling the |
246178f2 | 122 | standard swap function it is reset to the old value. */ |
252b5132 RH |
123 | |
124 | /* This macro is used for adjusting the filepointers, which | |
246178f2 | 125 | is done only, if the pointer is nonzero. */ |
252b5132 RH |
126 | |
127 | #define ADJUST_VAL(val,diff) \ | |
128 | if (val != 0) val += diff | |
129 | ||
130 | static void | |
131 | adjust_filehdr_in_post (abfd, src, dst) | |
9bf609ec | 132 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
133 | PTR src; |
134 | PTR dst; | |
135 | { | |
136 | FILHDR *filehdr_src = (FILHDR *) src; | |
137 | struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; | |
138 | ||
9bf609ec | 139 | ADJUST_VAL (filehdr_dst->f_symptr, GO32_STUBSIZE); |
252b5132 | 140 | |
9bf609ec JK |
141 | /* Save now the stub to be used later. Put the stub data to FILEHDR_DST |
142 | first as coff_data (abfd) still does not exist. It may not even be ever | |
143 | created as we are just checking the file format of ABFD. */ | |
144 | memcpy (filehdr_dst->go32stub, filehdr_src->stub, GO32_STUBSIZE); | |
145 | filehdr_dst->f_flags |= F_GO32STUB; | |
252b5132 RH |
146 | } |
147 | ||
148 | static void | |
149 | adjust_filehdr_out_pre (abfd, in, out) | |
150 | bfd *abfd; | |
151 | PTR in; | |
152 | PTR out; | |
153 | { | |
154 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
155 | FILHDR *filehdr_out = (FILHDR *) out; | |
156 | ||
246178f2 | 157 | /* Generate the stub. */ |
252b5132 RH |
158 | create_go32_stub (abfd); |
159 | ||
246178f2 | 160 | /* Copy the stub to the file header. */ |
9bf609ec JK |
161 | if (coff_data (abfd)->go32stub != NULL) |
162 | memcpy (filehdr_out->stub, coff_data (abfd)->go32stub, GO32_STUBSIZE); | |
252b5132 | 163 | else |
246178f2 | 164 | /* Use the default. */ |
9bf609ec | 165 | memcpy (filehdr_out->stub, stub_bytes, GO32_STUBSIZE); |
252b5132 | 166 | |
9bf609ec | 167 | ADJUST_VAL (filehdr_in->f_symptr, -GO32_STUBSIZE); |
252b5132 RH |
168 | } |
169 | ||
170 | static void | |
171 | adjust_filehdr_out_post (abfd, in, out) | |
5f771d47 | 172 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 173 | PTR in; |
5f771d47 | 174 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
175 | { |
176 | struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in; | |
246178f2 | 177 | /* Undo the above change. */ |
9bf609ec | 178 | ADJUST_VAL (filehdr_in->f_symptr, GO32_STUBSIZE); |
252b5132 RH |
179 | } |
180 | ||
181 | static void | |
182 | adjust_scnhdr_in_post (abfd, ext, in) | |
5f771d47 ILT |
183 | bfd *abfd ATTRIBUTE_UNUSED; |
184 | PTR ext ATTRIBUTE_UNUSED; | |
252b5132 RH |
185 | PTR in; |
186 | { | |
187 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
188 | ||
9bf609ec JK |
189 | ADJUST_VAL (scnhdr_int->s_scnptr, GO32_STUBSIZE); |
190 | ADJUST_VAL (scnhdr_int->s_relptr, GO32_STUBSIZE); | |
191 | ADJUST_VAL (scnhdr_int->s_lnnoptr, GO32_STUBSIZE); | |
252b5132 RH |
192 | } |
193 | ||
194 | static void | |
195 | adjust_scnhdr_out_pre (abfd, in, out) | |
5f771d47 | 196 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 197 | PTR in; |
5f771d47 | 198 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
199 | { |
200 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
201 | ||
9bf609ec JK |
202 | ADJUST_VAL (scnhdr_int->s_scnptr, -GO32_STUBSIZE); |
203 | ADJUST_VAL (scnhdr_int->s_relptr, -GO32_STUBSIZE); | |
204 | ADJUST_VAL (scnhdr_int->s_lnnoptr, -GO32_STUBSIZE); | |
252b5132 RH |
205 | } |
206 | ||
207 | static void | |
208 | adjust_scnhdr_out_post (abfd, in, out) | |
5f771d47 | 209 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 210 | PTR in; |
5f771d47 | 211 | PTR out ATTRIBUTE_UNUSED; |
252b5132 RH |
212 | { |
213 | struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; | |
214 | ||
9bf609ec JK |
215 | ADJUST_VAL (scnhdr_int->s_scnptr, GO32_STUBSIZE); |
216 | ADJUST_VAL (scnhdr_int->s_relptr, GO32_STUBSIZE); | |
217 | ADJUST_VAL (scnhdr_int->s_lnnoptr, GO32_STUBSIZE); | |
252b5132 RH |
218 | } |
219 | ||
220 | static void | |
96d56e9f | 221 | adjust_aux_in_post (abfd, ext1, type, in_class, indx, numaux, in1) |
5f771d47 ILT |
222 | bfd *abfd ATTRIBUTE_UNUSED; |
223 | PTR ext1 ATTRIBUTE_UNUSED; | |
252b5132 | 224 | int type; |
96d56e9f | 225 | int in_class; |
5f771d47 ILT |
226 | int indx ATTRIBUTE_UNUSED; |
227 | int numaux ATTRIBUTE_UNUSED; | |
252b5132 RH |
228 | PTR in1; |
229 | { | |
230 | union internal_auxent *in = (union internal_auxent *) in1; | |
231 | ||
96d56e9f NC |
232 | if (in_class == C_BLOCK || in_class == C_FCN || ISFCN (type) |
233 | || ISTAG (in_class)) | |
252b5132 | 234 | { |
9bf609ec | 235 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, GO32_STUBSIZE); |
252b5132 RH |
236 | } |
237 | } | |
238 | ||
239 | static void | |
96d56e9f | 240 | adjust_aux_out_pre (abfd, inp, type, in_class, indx, numaux, extp) |
5f771d47 | 241 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
242 | PTR inp; |
243 | int type; | |
96d56e9f | 244 | int in_class; |
5f771d47 ILT |
245 | int indx ATTRIBUTE_UNUSED; |
246 | int numaux ATTRIBUTE_UNUSED; | |
247 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
248 | { |
249 | union internal_auxent *in = (union internal_auxent *) inp; | |
250 | ||
96d56e9f NC |
251 | if (in_class == C_BLOCK || in_class == C_FCN || ISFCN (type) |
252 | || ISTAG (in_class)) | |
252b5132 | 253 | { |
9bf609ec | 254 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -GO32_STUBSIZE); |
252b5132 RH |
255 | } |
256 | } | |
257 | ||
258 | static void | |
96d56e9f | 259 | adjust_aux_out_post (abfd, inp, type, in_class, indx, numaux, extp) |
5f771d47 | 260 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
261 | PTR inp; |
262 | int type; | |
96d56e9f | 263 | int in_class; |
5f771d47 ILT |
264 | int indx ATTRIBUTE_UNUSED; |
265 | int numaux ATTRIBUTE_UNUSED; | |
266 | PTR extp ATTRIBUTE_UNUSED; | |
252b5132 RH |
267 | { |
268 | union internal_auxent *in = (union internal_auxent *) inp; | |
269 | ||
96d56e9f NC |
270 | if (in_class == C_BLOCK || in_class == C_FCN || ISFCN (type) |
271 | || ISTAG (in_class)) | |
252b5132 | 272 | { |
9bf609ec | 273 | ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, GO32_STUBSIZE); |
252b5132 RH |
274 | } |
275 | } | |
276 | ||
246178f2 | 277 | /* That's the function, which creates the stub. There are |
252b5132 RH |
278 | different cases from where the stub is taken. |
279 | At first the environment variable $(GO32STUB) is checked and then | |
280 | $(STUB) if it was not set. | |
281 | If it exists and points to a valid stub the stub is taken from | |
282 | that file. This file can be also a whole executable file, because | |
283 | the stub is computed from the exe information at the start of that | |
284 | file. | |
285 | ||
286 | If there was any error, the standard stub (compiled in this file) | |
246178f2 | 287 | is taken. */ |
252b5132 RH |
288 | |
289 | static void | |
290 | create_go32_stub (abfd) | |
291 | bfd *abfd; | |
292 | { | |
246178f2 | 293 | /* Do it only once. */ |
9bf609ec | 294 | if (coff_data (abfd)->go32stub == NULL) |
252b5132 RH |
295 | { |
296 | char *stub; | |
297 | struct stat st; | |
298 | int f; | |
299 | unsigned char header[10]; | |
300 | char magic[8]; | |
dc810e39 AM |
301 | unsigned long coff_start; |
302 | long exe_start; | |
252b5132 | 303 | |
246178f2 | 304 | /* Check at first the environment variable $(GO32STUB). */ |
252b5132 | 305 | stub = getenv ("GO32STUB"); |
246178f2 | 306 | /* Now check the environment variable $(STUB). */ |
252b5132 RH |
307 | if (stub == NULL) |
308 | stub = getenv ("STUB"); | |
309 | if (stub == NULL) | |
310 | goto stub_end; | |
311 | if (stat (stub, &st) != 0) | |
312 | goto stub_end; | |
313 | #ifdef O_BINARY | |
314 | f = open (stub, O_RDONLY | O_BINARY); | |
315 | #else | |
316 | f = open (stub, O_RDONLY); | |
317 | #endif | |
318 | if (f < 0) | |
319 | goto stub_end; | |
320 | if (read (f, &header, sizeof (header)) < 0) | |
321 | { | |
322 | close (f); | |
323 | goto stub_end; | |
324 | } | |
246178f2 | 325 | if (_H (0) != 0x5a4d) /* It is not an exe file. */ |
252b5132 RH |
326 | { |
327 | close (f); | |
328 | goto stub_end; | |
329 | } | |
330 | /* Compute the size of the stub (it is every thing up | |
246178f2 | 331 | to the beginning of the coff image). */ |
252b5132 RH |
332 | coff_start = (long) _H (2) * 512L; |
333 | if (_H (1)) | |
334 | coff_start += (long) _H (1) - 512L; | |
335 | ||
336 | /* Currently there is only a fixed stub size of 2048 bytes | |
246178f2 | 337 | supported. */ |
252b5132 RH |
338 | if (coff_start != 2048) |
339 | { | |
340 | close (f); | |
341 | goto stub_end; | |
342 | } | |
343 | exe_start = _H (4) * 16; | |
dc810e39 | 344 | if ((long) lseek (f, exe_start, SEEK_SET) != exe_start) |
252b5132 RH |
345 | { |
346 | close (f); | |
347 | goto stub_end; | |
348 | } | |
349 | if (read (f, &magic, 8) != 8) | |
350 | { | |
351 | close (f); | |
352 | goto stub_end; | |
353 | } | |
0112cd26 | 354 | if (! CONST_STRNEQ (magic, "go32stub")) |
252b5132 RH |
355 | { |
356 | close (f); | |
357 | goto stub_end; | |
358 | } | |
246178f2 | 359 | /* Now we found a correct stub (hopefully). */ |
9bf609ec JK |
360 | coff_data (abfd)->go32stub = bfd_alloc (abfd, (bfd_size_type) coff_start); |
361 | if (coff_data (abfd)->go32stub == NULL) | |
252b5132 RH |
362 | { |
363 | close (f); | |
364 | return; | |
365 | } | |
366 | lseek (f, 0L, SEEK_SET); | |
9bf609ec | 367 | if ((unsigned long) read (f, coff_data (abfd)->go32stub, coff_start) |
252b5132 RH |
368 | != coff_start) |
369 | { | |
9bf609ec JK |
370 | bfd_release (abfd, coff_data (abfd)->go32stub); |
371 | coff_data (abfd)->go32stub = NULL; | |
252b5132 RH |
372 | } |
373 | close (f); | |
374 | } | |
375 | stub_end: | |
376 | /* There was something wrong above, so use now the standard builtin | |
246178f2 | 377 | stub. */ |
9bf609ec | 378 | if (coff_data (abfd)->go32stub == NULL) |
252b5132 | 379 | { |
9bf609ec JK |
380 | coff_data (abfd)->go32stub |
381 | = bfd_alloc (abfd, (bfd_size_type) GO32_STUBSIZE); | |
382 | if (coff_data (abfd)->go32stub == NULL) | |
246178f2 | 383 | return; |
9bf609ec | 384 | memcpy (coff_data (abfd)->go32stub, stub_bytes, GO32_STUBSIZE); |
252b5132 RH |
385 | } |
386 | } | |
387 | ||
388 | /* If ibfd was a stubbed coff image, copy the stub from that bfd | |
246178f2 | 389 | to the new obfd. */ |
252b5132 | 390 | |
b34976b6 | 391 | static bfd_boolean |
252b5132 RH |
392 | go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd) |
393 | bfd *ibfd; | |
394 | bfd *obfd; | |
395 | { | |
246178f2 | 396 | /* Check if both are the same targets. */ |
252b5132 | 397 | if (ibfd->xvec != obfd->xvec) |
b34976b6 | 398 | return TRUE; |
252b5132 | 399 | |
e39e47bd | 400 | /* Check if we have a source stub. */ |
9bf609ec | 401 | if (coff_data (ibfd)->go32stub == NULL) |
b34976b6 | 402 | return TRUE; |
252b5132 | 403 | |
e39e47bd JK |
404 | /* As adjust_filehdr_out_pre may get called only after this function, |
405 | optionally allocate the output stub. */ | |
9bf609ec JK |
406 | if (coff_data (obfd)->go32stub == NULL) |
407 | coff_data (obfd)->go32stub = bfd_alloc (obfd, | |
408 | (bfd_size_type) GO32_STUBSIZE); | |
e39e47bd | 409 | |
246178f2 | 410 | /* Now copy the stub. */ |
9bf609ec JK |
411 | if (coff_data (obfd)->go32stub != NULL) |
412 | memcpy (coff_data (obfd)->go32stub, coff_data (ibfd)->go32stub, | |
413 | GO32_STUBSIZE); | |
252b5132 | 414 | |
b34976b6 | 415 | return TRUE; |
252b5132 | 416 | } |