Commit | Line | Data |
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429ab54e | 1 | /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 2001, 2002, 2003, |
114f9c96 | 2 | 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
7dd63af1 RS |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
7dd63af1 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
7dd63af1 RS |
10 | |
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
7dd63af1 RS |
18 | |
19 | ||
20 | /* | |
29cf3e20 EZ |
21 | * unexcoff.c - Convert a running program into an a.out or COFF file. |
22 | * | |
23 | * ================================================================== | |
24 | * Note: This file is currently used only by the MSDOS (a.k.a. DJGPP) | |
25 | * build of Emacs. If you are not interested in the MSDOS build, you | |
26 | * are looking at the wrong version of unexec! | |
27 | * ================================================================== | |
7dd63af1 RS |
28 | * |
29 | * Author: Spencer W. Thomas | |
30 | * Computer Science Dept. | |
31 | * University of Utah | |
32 | * Date: Tue Mar 2 1982 | |
29cf3e20 | 33 | * Originally under the name unexec.c. |
7dd63af1 RS |
34 | * Modified heavily since then. |
35 | * | |
36 | * Synopsis: | |
37 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
38 | * char *new_name, *a_name; | |
39 | * unsigned data_start, bss_start, entry_address; | |
40 | * | |
41 | * Takes a snapshot of the program and makes an a.out format file in the | |
42 | * file named by the string argument new_name. | |
43 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
44 | * On some machines, an existing a_name file is required. | |
45 | * | |
46 | * The boundaries within the a.out file may be adjusted with the data_start | |
47 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
48 | * | |
49 | * Data_start gives the boundary between the text segment and the data | |
50 | * segment of the program. The text segment can contain shared, read-only | |
51 | * program code and literal data, while the data segment is always unshared | |
52 | * and unprotected. Data_start gives the lowest unprotected address. | |
53 | * The value you specify may be rounded down to a suitable boundary | |
54 | * as required by the machine you are using. | |
55 | * | |
56 | * Specifying zero for data_start means the boundary between text and data | |
57 | * should not be the same as when the program was loaded. | |
7dd63af1 RS |
58 | * |
59 | * Bss_start indicates how much of the data segment is to be saved in the | |
60 | * a.out file and restored when the program is executed. It gives the lowest | |
61 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
62 | * is given assumes that the entire data segment is to be stored, including | |
63 | * the previous data and bss as well as any additional storage allocated with | |
64 | * break (2). | |
65 | * | |
66 | * The new file is set up to start at entry_address. | |
67 | * | |
68 | * If you make improvements I'd like to get them too. | |
69 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
70 | * | |
71 | */ | |
72 | ||
73 | /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
74 | * of Dell Computer Corporation. james@bigtex.cactus.org. | |
75 | */ | |
76 | ||
18160b98 | 77 | #include <config.h> |
7dd63af1 | 78 | #define PERROR(file) report_error (file, new) |
7dd63af1 RS |
79 | |
80 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
81 | ||
f914a6bf | 82 | #ifdef HAVE_COFF_H |
2a4487ac | 83 | #include <coff.h> |
3680bdc6 | 84 | #ifdef MSDOS |
8eb2807f | 85 | #include <fcntl.h> /* for O_RDONLY, O_RDWR */ |
c17a2102 | 86 | #include <crt0.h> /* for _crt0_startup_flags and its bits */ |
5f2f0bc1 | 87 | #include <sys/exceptn.h> |
c17a2102 | 88 | static int save_djgpp_startup_flags; |
3680bdc6 RS |
89 | #define filehdr external_filehdr |
90 | #define scnhdr external_scnhdr | |
91 | #define syment external_syment | |
92 | #define auxent external_auxent | |
93 | #define n_numaux e_numaux | |
94 | #define n_type e_type | |
95 | struct aouthdr | |
96 | { | |
234d3183 RS |
97 | unsigned short magic; /* type of file */ |
98 | unsigned short vstamp; /* version stamp */ | |
99 | unsigned long tsize; /* text size in bytes, padded to FW bdry*/ | |
100 | unsigned long dsize; /* initialized data " " */ | |
101 | unsigned long bsize; /* uninitialized data " " */ | |
102 | unsigned long entry; /* entry pt. */ | |
103 | unsigned long text_start;/* base of text used for this file */ | |
104 | unsigned long data_start;/* base of data used for this file */ | |
3680bdc6 | 105 | }; |
3680bdc6 | 106 | #endif /* not MSDOS */ |
f914a6bf | 107 | #else /* not HAVE_COFF_H */ |
8d228cb0 | 108 | #include <a.out.h> |
f914a6bf | 109 | #endif /* not HAVE_COFF_H */ |
265a9e55 | 110 | |
f34e2e18 RS |
111 | /* Define getpagesize if the system does not. |
112 | Note that this may depend on symbols defined in a.out.h. */ | |
7dd63af1 RS |
113 | #include "getpagesize.h" |
114 | ||
115 | #ifndef makedev /* Try to detect types.h already loaded */ | |
116 | #include <sys/types.h> | |
265a9e55 | 117 | #endif /* makedev */ |
7dd63af1 RS |
118 | #include <stdio.h> |
119 | #include <sys/stat.h> | |
120 | #include <errno.h> | |
121 | ||
f914a6bf | 122 | #include <sys/file.h> |
2d30a233 RM |
123 | |
124 | #ifndef O_RDONLY | |
125 | #define O_RDONLY 0 | |
126 | #endif | |
127 | #ifndef O_RDWR | |
128 | #define O_RDWR 2 | |
129 | #endif | |
130 | ||
131 | ||
5f2f0bc1 | 132 | extern char *start_of_data (void); /* Start of initialized data */ |
7dd63af1 | 133 | |
7dd63af1 RS |
134 | static long block_copy_start; /* Old executable start point */ |
135 | static struct filehdr f_hdr; /* File header */ | |
136 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
137 | long bias; /* Bias to add for growth */ | |
138 | long lnnoptr; /* Pointer to line-number info within file */ | |
139 | #define SYMS_START block_copy_start | |
140 | ||
141 | static long text_scnptr; | |
142 | static long data_scnptr; | |
143 | ||
c8b14b5f RS |
144 | static long coff_offset; |
145 | ||
7dd63af1 RS |
146 | static int pagemask; |
147 | ||
148 | /* Correct an int which is the bit pattern of a pointer to a byte | |
149 | into an int which is the number of a byte. | |
150 | This is a no-op on ordinary machines, but not on all. */ | |
151 | ||
7dd63af1 | 152 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) |
7dd63af1 | 153 | |
d7306fe6 | 154 | #include <setjmp.h> |
2d30a233 RM |
155 | #include "lisp.h" |
156 | ||
5f2f0bc1 EZ |
157 | static void |
158 | report_error (const char *file, int fd) | |
7dd63af1 RS |
159 | { |
160 | if (fd) | |
161 | close (fd); | |
2d30a233 | 162 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
7dd63af1 | 163 | } |
7dd63af1 RS |
164 | |
165 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
166 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
167 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
168 | ||
5f2f0bc1 EZ |
169 | static void |
170 | report_error_1 (int fd, const char *msg, int a1, int a2) | |
7dd63af1 RS |
171 | { |
172 | close (fd); | |
7dd63af1 | 173 | error (msg, a1, a2); |
7dd63af1 RS |
174 | } |
175 | \f | |
5f2f0bc1 EZ |
176 | static int make_hdr (int, int, unsigned, unsigned, unsigned, |
177 | const char *, const char *); | |
178 | static int copy_text_and_data (int, int); | |
179 | static int copy_sym (int, int, const char *, const char *); | |
180 | static void mark_x (const char *); | |
7dd63af1 | 181 | |
7dd63af1 RS |
182 | /* **************************************************************** |
183 | * make_hdr | |
184 | * | |
185 | * Make the header in the new a.out from the header in core. | |
186 | * Modify the text and data sizes. | |
187 | */ | |
188 | static int | |
5f2f0bc1 EZ |
189 | make_hdr (int new, int a_out, unsigned data_start, unsigned bss_start, |
190 | unsigned entry_address, const char *a_name, const char *new_name) | |
7dd63af1 | 191 | { |
7dd63af1 RS |
192 | auto struct scnhdr f_thdr; /* Text section header */ |
193 | auto struct scnhdr f_dhdr; /* Data section header */ | |
194 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
195 | auto struct scnhdr scntemp; /* Temporary section header */ | |
196 | register int scns; | |
7dd63af1 | 197 | unsigned int bss_end; |
7dd63af1 RS |
198 | |
199 | pagemask = getpagesize () - 1; | |
200 | ||
201 | /* Adjust text/data boundary. */ | |
7dd63af1 | 202 | data_start = (int) start_of_data (); |
7dd63af1 | 203 | data_start = ADDR_CORRECT (data_start); |
7dd63af1 | 204 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
7dd63af1 RS |
205 | |
206 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
207 | bss_end &= ~ pagemask; | |
208 | ||
209 | /* Adjust data/bss boundary. */ | |
210 | if (bss_start != 0) | |
211 | { | |
212 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
213 | /* (Up) to page bdry. */ | |
214 | bss_start &= ~ pagemask; | |
215 | if (bss_start > bss_end) | |
216 | { | |
217 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
218 | bss_start); | |
219 | } | |
220 | } | |
221 | else | |
222 | bss_start = bss_end; | |
223 | ||
224 | if (data_start > bss_start) /* Can't have negative data size. */ | |
225 | { | |
226 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
227 | data_start, bss_start); | |
228 | } | |
229 | ||
c8b14b5f RS |
230 | coff_offset = 0L; /* stays zero, except in DJGPP */ |
231 | ||
7dd63af1 RS |
232 | /* Salvage as much info from the existing file as possible */ |
233 | if (a_out >= 0) | |
234 | { | |
c8b14b5f | 235 | #ifdef MSDOS |
c8b14b5f RS |
236 | /* Support the coff-go32-exe format with a prepended stub, since |
237 | this is what GCC 2.8.0 and later generates by default in DJGPP. */ | |
238 | unsigned short mz_header[3]; | |
239 | ||
240 | if (read (a_out, &mz_header, sizeof (mz_header)) != sizeof (mz_header)) | |
241 | { | |
242 | PERROR (a_name); | |
243 | } | |
244 | if (mz_header[0] == 0x5a4d || mz_header[0] == 0x4d5a) /* "MZ" or "ZM" */ | |
245 | { | |
246 | coff_offset = (long)mz_header[2] * 512L; | |
247 | if (mz_header[1]) | |
248 | coff_offset += (long)mz_header[1] - 512L; | |
249 | lseek (a_out, coff_offset, 0); | |
250 | } | |
251 | else | |
252 | lseek (a_out, 0L, 0); | |
c8b14b5f | 253 | #endif /* MSDOS */ |
7dd63af1 RS |
254 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
255 | { | |
256 | PERROR (a_name); | |
257 | } | |
258 | block_copy_start += sizeof (f_hdr); | |
259 | if (f_hdr.f_opthdr > 0) | |
260 | { | |
261 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
262 | { | |
263 | PERROR (a_name); | |
264 | } | |
265 | block_copy_start += sizeof (f_ohdr); | |
266 | } | |
267 | /* Loop through section headers, copying them in */ | |
c8b14b5f | 268 | lseek (a_out, coff_offset + sizeof (f_hdr) + f_hdr.f_opthdr, 0); |
7dd63af1 RS |
269 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { |
270 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
271 | { | |
272 | PERROR (a_name); | |
273 | } | |
274 | if (scntemp.s_scnptr > 0L) | |
275 | { | |
276 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
277 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
278 | } | |
279 | if (strcmp (scntemp.s_name, ".text") == 0) | |
280 | { | |
281 | f_thdr = scntemp; | |
282 | } | |
283 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
284 | { | |
285 | f_dhdr = scntemp; | |
286 | } | |
287 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
288 | { | |
289 | f_bhdr = scntemp; | |
290 | } | |
291 | } | |
292 | } | |
293 | else | |
294 | { | |
295 | ERROR0 ("can't build a COFF file from scratch yet"); | |
296 | } | |
297 | ||
298 | /* Now we alter the contents of all the f_*hdr variables | |
299 | to correspond to what we want to dump. */ | |
300 | ||
7dd63af1 | 301 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); |
7dd63af1 RS |
302 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
303 | f_ohdr.bsize = bss_end - bss_start; | |
7dd63af1 RS |
304 | f_thdr.s_size = f_ohdr.tsize; |
305 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
306 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
7dd63af1 | 307 | lnnoptr = f_thdr.s_lnnoptr; |
7dd63af1 | 308 | text_scnptr = f_thdr.s_scnptr; |
7dd63af1 | 309 | f_dhdr.s_paddr = f_ohdr.data_start; |
7dd63af1 RS |
310 | f_dhdr.s_vaddr = f_ohdr.data_start; |
311 | f_dhdr.s_size = f_ohdr.dsize; | |
312 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
7dd63af1 | 313 | data_scnptr = f_dhdr.s_scnptr; |
7dd63af1 | 314 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
7dd63af1 RS |
315 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; |
316 | f_bhdr.s_size = f_ohdr.bsize; | |
317 | f_bhdr.s_scnptr = 0L; | |
7dd63af1 | 318 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; |
7dd63af1 RS |
319 | |
320 | if (f_hdr.f_symptr > 0L) | |
321 | { | |
322 | f_hdr.f_symptr += bias; | |
323 | } | |
324 | ||
325 | if (f_thdr.s_lnnoptr > 0L) | |
326 | { | |
327 | f_thdr.s_lnnoptr += bias; | |
328 | } | |
329 | ||
7dd63af1 RS |
330 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
331 | { | |
332 | PERROR (new_name); | |
333 | } | |
334 | ||
335 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
336 | { | |
337 | PERROR (new_name); | |
338 | } | |
339 | ||
7dd63af1 RS |
340 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
341 | { | |
342 | PERROR (new_name); | |
343 | } | |
344 | ||
345 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
346 | { | |
347 | PERROR (new_name); | |
348 | } | |
349 | ||
350 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
351 | { | |
352 | PERROR (new_name); | |
353 | } | |
354 | ||
7dd63af1 RS |
355 | return (0); |
356 | ||
7dd63af1 RS |
357 | } |
358 | \f | |
5f2f0bc1 EZ |
359 | void |
360 | write_segment (int new, const char *ptr, const char *end) | |
730f4d72 EZ |
361 | { |
362 | register int i, nwrite, ret; | |
730f4d72 EZ |
363 | /* This is the normal amount to write at once. |
364 | It is the size of block that NFS uses. */ | |
365 | int writesize = 1 << 13; | |
366 | int pagesize = getpagesize (); | |
367 | char zeros[1 << 13]; | |
368 | ||
72af86bd | 369 | memset (zeros, 0, sizeof (zeros)); |
730f4d72 EZ |
370 | |
371 | for (i = 0; ptr < end;) | |
372 | { | |
373 | /* Distance to next multiple of writesize. */ | |
374 | nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
375 | /* But not beyond specified end. */ | |
376 | if (nwrite > end - ptr) nwrite = end - ptr; | |
377 | ret = write (new, ptr, nwrite); | |
378 | /* If write gets a page fault, it means we reached | |
379 | a gap between the old text segment and the old data segment. | |
380 | This gap has probably been remapped into part of the text segment. | |
381 | So write zeros for it. */ | |
382 | if (ret == -1 | |
383 | #ifdef EFAULT | |
384 | && errno == EFAULT | |
385 | #endif | |
386 | ) | |
387 | { | |
388 | /* Write only a page of zeros at once, | |
2b34df4e | 389 | so that we don't overshoot the start |
730f4d72 EZ |
390 | of the valid memory in the old data segment. */ |
391 | if (nwrite > pagesize) | |
392 | nwrite = pagesize; | |
393 | write (new, zeros, nwrite); | |
394 | } | |
730f4d72 EZ |
395 | i += nwrite; |
396 | ptr += nwrite; | |
397 | } | |
398 | } | |
7dd63af1 RS |
399 | /* **************************************************************** |
400 | * copy_text_and_data | |
401 | * | |
402 | * Copy the text and data segments from memory to the new a.out | |
403 | */ | |
404 | static int | |
5f2f0bc1 | 405 | copy_text_and_data (int new, int a_out) |
7dd63af1 RS |
406 | { |
407 | register char *end; | |
408 | register char *ptr; | |
409 | ||
8eb2807f | 410 | #ifdef MSDOS |
8eb2807f RS |
411 | /* Dump the original table of exception handlers, not the one |
412 | where our exception hooks are registered. */ | |
413 | __djgpp_exception_toggle (); | |
c17a2102 KH |
414 | |
415 | /* Switch off startup flags that might have been set at runtime | |
416 | and which might change the way that dumped Emacs works. */ | |
417 | save_djgpp_startup_flags = _crt0_startup_flags; | |
418 | _crt0_startup_flags &= ~(_CRT0_FLAG_NO_LFN | _CRT0_FLAG_NEARPTR); | |
8eb2807f RS |
419 | #endif |
420 | ||
7dd63af1 RS |
421 | lseek (new, (long) text_scnptr, 0); |
422 | ptr = (char *) f_ohdr.text_start; | |
7dd63af1 RS |
423 | end = ptr + f_ohdr.tsize; |
424 | write_segment (new, ptr, end); | |
425 | ||
426 | lseek (new, (long) data_scnptr, 0); | |
427 | ptr = (char *) f_ohdr.data_start; | |
428 | end = ptr + f_ohdr.dsize; | |
429 | write_segment (new, ptr, end); | |
430 | ||
8eb2807f | 431 | #ifdef MSDOS |
8eb2807f RS |
432 | /* Restore our exception hooks. */ |
433 | __djgpp_exception_toggle (); | |
c17a2102 KH |
434 | |
435 | /* Restore the startup flags. */ | |
436 | _crt0_startup_flags = save_djgpp_startup_flags; | |
8eb2807f | 437 | #endif |
8eb2807f | 438 | |
7dd63af1 RS |
439 | |
440 | return 0; | |
441 | } | |
7dd63af1 RS |
442 | \f |
443 | /* **************************************************************** | |
444 | * copy_sym | |
445 | * | |
446 | * Copy the relocation information and symbol table from the a.out to the new | |
447 | */ | |
448 | static int | |
5f2f0bc1 | 449 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
7dd63af1 RS |
450 | { |
451 | char page[1024]; | |
452 | int n; | |
453 | ||
454 | if (a_out < 0) | |
455 | return 0; | |
456 | ||
7dd63af1 RS |
457 | if (SYMS_START == 0L) |
458 | return 0; | |
7dd63af1 | 459 | |
7dd63af1 | 460 | if (lnnoptr) /* if there is line number info */ |
c8b14b5f | 461 | lseek (a_out, coff_offset + lnnoptr, 0); /* start copying from there */ |
7dd63af1 | 462 | else |
c8b14b5f | 463 | lseek (a_out, coff_offset + SYMS_START, 0); /* Position a.out to symtab. */ |
7dd63af1 RS |
464 | |
465 | while ((n = read (a_out, page, sizeof page)) > 0) | |
466 | { | |
467 | if (write (new, page, n) != n) | |
468 | { | |
469 | PERROR (new_name); | |
470 | } | |
471 | } | |
472 | if (n < 0) | |
473 | { | |
474 | PERROR (a_name); | |
475 | } | |
476 | return 0; | |
477 | } | |
478 | \f | |
479 | /* **************************************************************** | |
480 | * mark_x | |
481 | * | |
eb8c3be9 | 482 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
483 | */ |
484 | static void | |
5f2f0bc1 | 485 | mark_x (const char *name) |
7dd63af1 RS |
486 | { |
487 | struct stat sbuf; | |
488 | int um; | |
489 | int new = 0; /* for PERROR */ | |
490 | ||
491 | um = umask (777); | |
492 | umask (um); | |
493 | if (stat (name, &sbuf) == -1) | |
494 | { | |
495 | PERROR (name); | |
496 | } | |
497 | sbuf.st_mode |= 0111 & ~um; | |
498 | if (chmod (name, sbuf.st_mode) == -1) | |
499 | PERROR (name); | |
500 | } | |
501 | \f | |
7dd63af1 RS |
502 | |
503 | /* | |
504 | * If the COFF file contains a symbol table and a line number section, | |
505 | * then any auxiliary entries that have values for x_lnnoptr must | |
506 | * be adjusted by the amount that the line number section has moved | |
507 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
508 | * the auxiliary entry structures used the absolute file offsets for | |
509 | * the line number entry rather than an offset from the start of the | |
510 | * line number section! | |
511 | * | |
512 | * When I figure out how to scan through the symbol table and pick out | |
513 | * the auxiliary entries that need adjustment, this routine will | |
514 | * be fixed. As it is now, all such entries are wrong and sdb | |
515 | * will complain. Fred Fish, UniSoft Systems Inc. | |
516 | */ | |
517 | ||
518 | /* This function is probably very slow. Instead of reopening the new | |
519 | file for input and output it should copy from the old to the new | |
520 | using the two descriptors already open (WRITEDESC and READDESC). | |
521 | Instead of reading one small structure at a time it should use | |
522 | a reasonable size buffer. But I don't have time to work on such | |
523 | things, so I am installing it as submitted to me. -- RMS. */ | |
524 | ||
5f2f0bc1 EZ |
525 | int |
526 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) | |
7dd63af1 RS |
527 | { |
528 | register int nsyms; | |
529 | register int new; | |
7dd63af1 RS |
530 | struct syment symentry; |
531 | union auxent auxentry; | |
7dd63af1 RS |
532 | |
533 | if (!lnnoptr || !f_hdr.f_symptr) | |
534 | return 0; | |
535 | ||
3680bdc6 RS |
536 | #ifdef MSDOS |
537 | if ((new = writedesc) < 0) | |
538 | #else | |
2d30a233 | 539 | if ((new = open (new_name, O_RDWR)) < 0) |
3680bdc6 | 540 | #endif |
7dd63af1 RS |
541 | { |
542 | PERROR (new_name); | |
543 | return -1; | |
544 | } | |
545 | ||
546 | lseek (new, f_hdr.f_symptr, 0); | |
547 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
548 | { | |
549 | read (new, &symentry, SYMESZ); | |
550 | if (symentry.n_numaux) | |
551 | { | |
552 | read (new, &auxentry, AUXESZ); | |
553 | nsyms++; | |
1ba3de00 RS |
554 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
555 | { | |
556 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
557 | lseek (new, -AUXESZ, 1); | |
558 | write (new, &auxentry, AUXESZ); | |
559 | } | |
7dd63af1 RS |
560 | } |
561 | } | |
3680bdc6 | 562 | #ifndef MSDOS |
7dd63af1 | 563 | close (new); |
3680bdc6 RS |
564 | #endif |
565 | return 0; | |
7dd63af1 RS |
566 | } |
567 | ||
730f4d72 EZ |
568 | /* **************************************************************** |
569 | * unexec | |
570 | * | |
571 | * driving logic. | |
572 | */ | |
5f2f0bc1 EZ |
573 | int |
574 | unexec (const char *new_name, const char *a_name, | |
575 | unsigned data_start, unsigned bss_start, unsigned entry_address) | |
730f4d72 | 576 | { |
5f2f0bc1 | 577 | int new = -1, a_out = -1; |
730f4d72 EZ |
578 | |
579 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
580 | { | |
581 | PERROR (a_name); | |
582 | } | |
583 | if ((new = creat (new_name, 0666)) < 0) | |
584 | { | |
585 | PERROR (new_name); | |
586 | } | |
587 | ||
588 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
589 | || copy_text_and_data (new, a_out) < 0 | |
590 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
730f4d72 | 591 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
730f4d72 EZ |
592 | ) |
593 | { | |
594 | close (new); | |
730f4d72 EZ |
595 | return -1; |
596 | } | |
597 | ||
598 | close (new); | |
599 | if (a_out >= 0) | |
600 | close (a_out); | |
601 | mark_x (new_name); | |
602 | return 0; | |
603 | } | |
604 | ||
7dd63af1 | 605 | #endif /* not CANNOT_DUMP */ |
ab5796a9 MB |
606 | |
607 | /* arch-tag: 62409b69-e27a-4a7c-9413-0210d6b54e7f | |
608 | (do not change this comment) */ |