Commit | Line | Data |
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9889c728 JB |
1 | /* Unexec for MIPS (including IRIS4D). |
2 | Note that the GNU project considers support for MIPS operation | |
3 | a peripheral activity which should not be allowed to divert effort | |
4 | from development of the GNU system. Changes in this code will be | |
5 | installed when users send them in, but aside from that | |
6 | we don't plan to think about it, or about whether other Emacs | |
7 | maintenance might break it. | |
8 | ||
20c92ac7 | 9 | Copyright (C) 1988, 1994 Free Software Foundation, Inc. |
9889c728 JB |
10 | |
11 | This file is part of GNU Emacs. | |
12 | ||
13 | GNU Emacs is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
20c92ac7 | 15 | the Free Software Foundation; either version 2, or (at your option) |
9889c728 JB |
16 | any later version. |
17 | ||
18 | GNU Emacs is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with GNU Emacs; see the file COPYING. If not, write to | |
25 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
26 | ||
27 | \f | |
18160b98 | 28 | #include <config.h> |
9889c728 JB |
29 | #include <sys/types.h> |
30 | #include <sys/file.h> | |
31 | #include <sys/stat.h> | |
32 | #include <stdio.h> | |
33 | #include <varargs.h> | |
34 | #include <filehdr.h> | |
35 | #include <aouthdr.h> | |
36 | #include <scnhdr.h> | |
37 | #include <sym.h> | |
38 | ||
a36d8f29 | 39 | #if defined (IRIS_4D) || defined (sony) |
9889c728 | 40 | #include "getpagesize.h" |
a36d8f29 | 41 | #include <fcntl.h> |
9889c728 JB |
42 | #endif |
43 | ||
44 | static void fatal_unexec (); | |
4fbc0284 | 45 | static void mark_x (); |
9889c728 JB |
46 | |
47 | #define READ(_fd, _buffer, _size, _error_message, _error_arg) \ | |
48 | errno = EEOF; \ | |
49 | if (read (_fd, _buffer, _size) != _size) \ | |
50 | fatal_unexec (_error_message, _error_arg); | |
51 | ||
52 | #define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \ | |
53 | if (write (_fd, _buffer, _size) != _size) \ | |
54 | fatal_unexec (_error_message, _error_arg); | |
55 | ||
56 | #define SEEK(_fd, _position, _error_message, _error_arg) \ | |
57 | errno = EEOF; \ | |
58 | if (lseek (_fd, _position, L_SET) != _position) \ | |
59 | fatal_unexec (_error_message, _error_arg); | |
60 | ||
61 | extern int errno; | |
20c92ac7 | 62 | extern char *strerror (); |
9889c728 JB |
63 | #define EEOF -1 |
64 | ||
65 | static struct scnhdr *text_section; | |
66 | static struct scnhdr *init_section; | |
67 | static struct scnhdr *finit_section; | |
68 | static struct scnhdr *rdata_section; | |
69 | static struct scnhdr *data_section; | |
70 | static struct scnhdr *lit8_section; | |
71 | static struct scnhdr *lit4_section; | |
72 | static struct scnhdr *sdata_section; | |
73 | static struct scnhdr *sbss_section; | |
74 | static struct scnhdr *bss_section; | |
75 | ||
76 | struct headers { | |
77 | struct filehdr fhdr; | |
78 | struct aouthdr aout; | |
79 | struct scnhdr section[10]; | |
80 | }; | |
81 | ||
82 | /* Define name of label for entry point for the dumped executable. */ | |
83 | ||
84 | #ifndef DEFAULT_ENTRY_ADDRESS | |
85 | #define DEFAULT_ENTRY_ADDRESS __start | |
86 | #endif | |
87 | \f | |
88 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
89 | char *new_name, *a_name; | |
90 | unsigned data_start, bss_start, entry_address; | |
91 | { | |
92 | int new, old; | |
93 | int pagesize, brk; | |
94 | int newsyms, symrel; | |
95 | int nread; | |
96 | struct headers hdr; | |
97 | int i; | |
98 | int vaddr, scnptr; | |
99 | #define BUFSIZE 8192 | |
100 | char buffer[BUFSIZE]; | |
101 | ||
102 | old = open (a_name, O_RDONLY, 0); | |
103 | if (old < 0) fatal_unexec ("opening %s", a_name); | |
104 | ||
105 | new = creat (new_name, 0666); | |
106 | if (new < 0) fatal_unexec ("creating %s", new_name); | |
107 | ||
108 | hdr = *((struct headers *)TEXT_START); | |
109 | #ifdef MIPS2 | |
110 | if (hdr.fhdr.f_magic != MIPSELMAGIC | |
111 | && hdr.fhdr.f_magic != MIPSEBMAGIC | |
112 | && hdr.fhdr.f_magic != (MIPSELMAGIC | 1) | |
113 | && hdr.fhdr.f_magic != (MIPSEBMAGIC | 1)) | |
114 | { | |
a36d8f29 RS |
115 | fprintf (stderr, |
116 | "unexec: input file magic number is %x, not %x, %x, %x or %x.\n", | |
117 | hdr.fhdr.f_magic, | |
118 | MIPSELMAGIC, MIPSEBMAGIC, | |
119 | MIPSELMAGIC | 1, MIPSEBMAGIC | 1); | |
9889c728 JB |
120 | exit(1); |
121 | } | |
122 | #else /* not MIPS2 */ | |
123 | if (hdr.fhdr.f_magic != MIPSELMAGIC | |
124 | && hdr.fhdr.f_magic != MIPSEBMAGIC) | |
125 | { | |
126 | fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n", | |
127 | hdr.fhdr.f_magic, MIPSELMAGIC, MIPSEBMAGIC); | |
128 | exit (1); | |
129 | } | |
130 | #endif /* not MIPS2 */ | |
131 | if (hdr.fhdr.f_opthdr != sizeof (hdr.aout)) | |
132 | { | |
133 | fprintf (stderr, "unexec: input a.out header is %d bytes, not %d.\n", | |
134 | hdr.fhdr.f_opthdr, sizeof (hdr.aout)); | |
135 | exit (1); | |
136 | } | |
137 | if (hdr.aout.magic != ZMAGIC) | |
138 | { | |
139 | fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n", | |
140 | hdr.aout.magic, ZMAGIC); | |
141 | exit (1); | |
142 | } | |
143 | ||
144 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
248a26a7 RS |
145 | ptr = NULL; \ |
146 | for (i = 0; i < hdr.fhdr.f_nscns && !ptr; i++) \ | |
147 | if (strcmp (hdr.section[i].s_name, name) == 0) \ | |
148 | { \ | |
149 | if (hdr.section[i].s_flags != flags) \ | |
150 | fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \ | |
151 | hdr.section[i].s_flags, flags, name); \ | |
152 | ptr = hdr.section + i; \ | |
153 | } \ | |
154 | ||
9889c728 JB |
155 | CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT); |
156 | CHECK_SCNHDR (init_section, _INIT, STYP_INIT); | |
157 | CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA); | |
158 | CHECK_SCNHDR (data_section, _DATA, STYP_DATA); | |
159 | #ifdef _LIT8 | |
160 | CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8); | |
161 | CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4); | |
162 | #endif /* _LIT8 */ | |
163 | CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA); | |
164 | CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS); | |
165 | CHECK_SCNHDR (bss_section, _BSS, STYP_BSS); | |
a36d8f29 RS |
166 | #if 0 /* Apparently this error check goes off on irix 3.3, |
167 | but it doesn't indicate a real problem. */ | |
9889c728 JB |
168 | if (i != hdr.fhdr.f_nscns) |
169 | fprintf (stderr, "unexec: %d sections found instead of %d.\n", | |
170 | i, hdr.fhdr.f_nscns); | |
a36d8f29 RS |
171 | #endif |
172 | ||
173 | text_section->s_scnptr = 0; | |
9889c728 JB |
174 | |
175 | pagesize = getpagesize (); | |
817adff7 RS |
176 | /* Casting to int avoids compiler error on NEWS-OS 5.0.2. */ |
177 | brk = (((int) (sbrk (0))) + pagesize - 1) & (-pagesize); | |
9889c728 JB |
178 | hdr.aout.dsize = brk - DATA_START; |
179 | hdr.aout.bsize = 0; | |
180 | if (entry_address == 0) | |
181 | { | |
182 | extern DEFAULT_ENTRY_ADDRESS (); | |
183 | hdr.aout.entry = (unsigned)DEFAULT_ENTRY_ADDRESS; | |
184 | } | |
185 | else | |
186 | hdr.aout.entry = entry_address; | |
187 | ||
188 | hdr.aout.bss_start = hdr.aout.data_start + hdr.aout.dsize; | |
189 | rdata_section->s_size = data_start - DATA_START; | |
248a26a7 RS |
190 | |
191 | /* Adjust start and virtual addresses of rdata_section, too. */ | |
192 | rdata_section->s_vaddr = DATA_START; | |
193 | rdata_section->s_paddr = DATA_START; | |
194 | rdata_section->s_scnptr = text_section->s_scnptr + hdr.aout.tsize; | |
195 | ||
9889c728 JB |
196 | data_section->s_vaddr = data_start; |
197 | data_section->s_paddr = data_start; | |
c7663c14 | 198 | data_section->s_size = brk - data_start; |
9889c728 JB |
199 | data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size; |
200 | vaddr = data_section->s_vaddr + data_section->s_size; | |
201 | scnptr = data_section->s_scnptr + data_section->s_size; | |
202 | if (lit8_section != NULL) | |
203 | { | |
204 | lit8_section->s_vaddr = vaddr; | |
205 | lit8_section->s_paddr = vaddr; | |
206 | lit8_section->s_size = 0; | |
207 | lit8_section->s_scnptr = scnptr; | |
208 | } | |
209 | if (lit4_section != NULL) | |
210 | { | |
211 | lit4_section->s_vaddr = vaddr; | |
212 | lit4_section->s_paddr = vaddr; | |
213 | lit4_section->s_size = 0; | |
214 | lit4_section->s_scnptr = scnptr; | |
215 | } | |
216 | if (sdata_section != NULL) | |
217 | { | |
218 | sdata_section->s_vaddr = vaddr; | |
219 | sdata_section->s_paddr = vaddr; | |
220 | sdata_section->s_size = 0; | |
221 | sdata_section->s_scnptr = scnptr; | |
222 | } | |
223 | if (sbss_section != NULL) | |
224 | { | |
225 | sbss_section->s_vaddr = vaddr; | |
226 | sbss_section->s_paddr = vaddr; | |
227 | sbss_section->s_size = 0; | |
228 | sbss_section->s_scnptr = scnptr; | |
229 | } | |
230 | if (bss_section != NULL) | |
231 | { | |
232 | bss_section->s_vaddr = vaddr; | |
233 | bss_section->s_paddr = vaddr; | |
234 | bss_section->s_size = 0; | |
235 | bss_section->s_scnptr = scnptr; | |
236 | } | |
237 | ||
238 | WRITE (new, TEXT_START, hdr.aout.tsize, | |
239 | "writing text section to %s", new_name); | |
240 | WRITE (new, DATA_START, hdr.aout.dsize, | |
241 | "writing text section to %s", new_name); | |
242 | ||
243 | SEEK (old, hdr.fhdr.f_symptr, "seeking to start of symbols in %s", a_name); | |
244 | errno = EEOF; | |
245 | nread = read (old, buffer, BUFSIZE); | |
246 | if (nread < sizeof (HDRR)) fatal_unexec ("reading symbols from %s", a_name); | |
247 | #define symhdr ((pHDRR)buffer) | |
248 | newsyms = hdr.aout.tsize + hdr.aout.dsize; | |
249 | symrel = newsyms - hdr.fhdr.f_symptr; | |
250 | hdr.fhdr.f_symptr = newsyms; | |
251 | symhdr->cbLineOffset += symrel; | |
252 | symhdr->cbDnOffset += symrel; | |
253 | symhdr->cbPdOffset += symrel; | |
254 | symhdr->cbSymOffset += symrel; | |
255 | symhdr->cbOptOffset += symrel; | |
256 | symhdr->cbAuxOffset += symrel; | |
257 | symhdr->cbSsOffset += symrel; | |
258 | symhdr->cbSsExtOffset += symrel; | |
259 | symhdr->cbFdOffset += symrel; | |
260 | symhdr->cbRfdOffset += symrel; | |
261 | symhdr->cbExtOffset += symrel; | |
262 | #undef symhdr | |
263 | do | |
264 | { | |
265 | if (write (new, buffer, nread) != nread) | |
266 | fatal_unexec ("writing symbols to %s", new_name); | |
267 | nread = read (old, buffer, BUFSIZE); | |
268 | if (nread < 0) fatal_unexec ("reading symbols from %s", a_name); | |
269 | #undef BUFSIZE | |
270 | } while (nread != 0); | |
271 | ||
272 | SEEK (new, 0, "seeking to start of header in %s", new_name); | |
273 | WRITE (new, &hdr, sizeof (hdr), | |
274 | "writing header of %s", new_name); | |
275 | ||
276 | close (old); | |
277 | close (new); | |
278 | mark_x (new_name); | |
279 | } | |
280 | \f | |
281 | /* | |
282 | * mark_x | |
283 | * | |
eb8c3be9 | 284 | * After successfully building the new a.out, mark it executable |
9889c728 JB |
285 | */ |
286 | ||
4fbc0284 | 287 | static void |
9889c728 JB |
288 | mark_x (name) |
289 | char *name; | |
290 | { | |
291 | struct stat sbuf; | |
292 | int um = umask (777); | |
293 | umask (um); | |
294 | if (stat (name, &sbuf) < 0) | |
295 | fatal_unexec ("getting protection on %s", name); | |
296 | sbuf.st_mode |= 0111 & ~um; | |
297 | if (chmod (name, sbuf.st_mode) < 0) | |
298 | fatal_unexec ("setting protection on %s", name); | |
299 | } | |
300 | ||
301 | static void | |
302 | fatal_unexec (s, va_alist) | |
20c92ac7 | 303 | va_dcl |
9889c728 JB |
304 | { |
305 | va_list ap; | |
306 | if (errno == EEOF) | |
307 | fputs ("unexec: unexpected end of file, ", stderr); | |
9889c728 | 308 | else |
20c92ac7 | 309 | fprintf (stderr, "unexec: %s, ", strerror (errno)); |
9889c728 JB |
310 | va_start (ap); |
311 | _doprnt (s, ap, stderr); | |
312 | fputs (".\n", stderr); | |
313 | exit (1); | |
314 | } |