Annotation of src/usr.bin/strip/strip.c, Revision 1.26
1.26 ! deraadt 1: /* $OpenBSD: strip.c,v 1.25 2009/06/19 09:40:43 sobrado Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*
4: * Copyright (c) 1988 Regents of the University of California.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.19 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
1.4 deraadt 32: #include <sys/param.h>
1.1 deraadt 33: #include <sys/types.h>
34: #include <sys/stat.h>
35: #include <sys/mman.h>
36: #include <fcntl.h>
37: #include <errno.h>
38: #include <a.out.h>
39: #include <unistd.h>
40: #include <stdio.h>
41: #include <stdlib.h>
42: #include <string.h>
1.7 mickey 43: #include <err.h>
1.11 espie 44: #include <ranlib.h>
45: #include "byte.c"
1.10 niklas 46:
47: #ifdef MID_MACHINE_OVERRIDE
48: #undef MID_MACHINE
49: #define MID_MACHINE MID_MACHINE_OVERRIDE
1.21 mickey 50: #if MID_MACHINE_OVERRIDE == MID_M68K
51: #undef __LDPGSZ
52: #undef ELF_TARG_DATA
53: #undef ELF_TARG_MACH
54: #include "m68k/exec.h"
1.22 miod 55: #elif MID_MACHINE_OVERRIDE == MID_M88K
56: #undef __LDPGSZ
57: #undef ELF_TARG_DATA
58: #undef ELF_TARG_MACH
59: #include "m88k/exec.h"
1.21 mickey 60: #endif
1.10 niklas 61: #endif
1.1 deraadt 62:
63: typedef struct exec EXEC;
64: typedef struct nlist NLIST;
65:
66: #define strx n_un.n_strx
67:
1.17 espie 68: int s_stab(const char *, int, EXEC *, struct stat *, off_t *);
69: int s_sym(const char *, int, EXEC *, struct stat *, off_t *);
1.16 millert 70: void usage(void);
1.1 deraadt 71:
72: int xflag = 0;
73:
1.9 deraadt 74: int
1.20 deraadt 75: main(int argc, char *argv[])
1.1 deraadt 76: {
1.15 mpech 77: int fd;
1.1 deraadt 78: EXEC *ep;
79: struct stat sb;
1.17 espie 80: int (*sfcn)(const char *, int, EXEC *, struct stat *, off_t *);
1.1 deraadt 81: int ch, errors;
82: char *fn;
1.17 espie 83: off_t newsize;
1.1 deraadt 84:
85: sfcn = s_sym;
1.6 millert 86: while ((ch = getopt(argc, argv, "dx")) != -1)
1.1 deraadt 87: switch(ch) {
88: case 'x':
89: xflag = 1;
90: /*FALLTHROUGH*/
91: case 'd':
92: sfcn = s_stab;
93: break;
94: case '?':
95: default:
96: usage();
97: }
98: argc -= optind;
99: argv += optind;
100:
101: errors = 0;
1.8 mickey 102: #define ERROR(x) errors |= 1; warnx("%s: %s", fn, strerror(x)); continue;
1.9 deraadt 103: while ((fn = *argv++)) {
1.1 deraadt 104: if ((fd = open(fn, O_RDWR)) < 0) {
105: ERROR(errno);
106: }
107: if (fstat(fd, &sb)) {
108: (void)close(fd);
109: ERROR(errno);
110: }
111: if (sb.st_size < sizeof(EXEC)) {
112: (void)close(fd);
113: ERROR(EFTYPE);
114: }
115: if ((ep = (EXEC *)mmap(NULL, sb.st_size, PROT_READ|PROT_WRITE,
1.13 art 116: MAP_SHARED, fd, (off_t)0)) == MAP_FAILED) {
1.1 deraadt 117: (void)close(fd);
118: ERROR(errno);
119: }
1.11 espie 120: if (BAD_OBJECT(*ep)) {
1.1 deraadt 121: munmap((caddr_t)ep, sb.st_size);
122: (void)close(fd);
123: ERROR(EFTYPE);
124: }
1.25 sobrado 125: /*
126: * Since we're dealing with an mmap there, we have to convert
127: * once for dealing with data in memory, and a second time
128: * for out.
1.11 espie 129: */
130: fix_header_order(ep);
1.17 espie 131: newsize = 0;
132: errors |= sfcn(fn, fd, ep, &sb, &newsize);
1.11 espie 133: fix_header_order(ep);
1.1 deraadt 134: munmap((caddr_t)ep, sb.st_size);
1.17 espie 135: if (newsize && ftruncate(fd, newsize)) {
136: warn("%s", fn);
137: errors = 1;
138: }
1.1 deraadt 139: if (close(fd)) {
140: ERROR(errno);
141: }
142: }
143: #undef ERROR
144: exit(errors);
145: }
146:
147: int
1.20 deraadt 148: s_sym(const char *fn, int fd, EXEC *ep, struct stat *sp, off_t *sz)
1.1 deraadt 149: {
1.15 mpech 150: char *neweof;
1.14 pvalchev 151: #if 0
1.15 mpech 152: char *mineof;
1.14 pvalchev 153: #endif
1.1 deraadt 154: int zmagic;
155:
156: zmagic = ep->a_data &&
157: (N_GETMAGIC(*ep) == ZMAGIC || N_GETMAGIC(*ep) == QMAGIC);
158:
159: /*
160: * If no symbols or data/text relocation info and
161: * the file data segment size is already minimized, quit.
162: */
163: if (!ep->a_syms && !ep->a_trsize && !ep->a_drsize) {
164: #if 0
165: if (!zmagic)
166: return 0;
167: if (sp->st_size < N_TRELOFF(*ep))
168: #endif
169: return 0;
170: }
171:
172: /*
173: * New file size is the header plus text and data segments; OMAGIC
174: * and NMAGIC formats have the text/data immediately following the
175: * header. ZMAGIC format wastes the rest of of header page.
176: */
177: neweof = (char *)ep + N_TRELOFF(*ep);
178:
179: #if 0
180: /*
181: * Unfortunately, this can't work correctly without changing the way
182: * the loader works. We could cap it at one page, or even fiddle with
183: * a_data and a_bss, but this only works for CLBYTES == NBPG. If we
184: * are on a system where, e.g., CLBYTES is 8k and NBPG is 4k, and we
185: * happen to remove 4.5k, we will lose. And we really don't want to
186: * fiddle with pages, because that breaks binary compatibility. Lose.
187: */
188:
189: if (zmagic) {
190: /*
191: * Get rid of unneeded zeroes at the end of the data segment
192: * to reduce the file size even more.
193: */
194: mineof = (char *)ep + N_DATOFF(*ep);
195: while (neweof > mineof && neweof[-1] == '\0')
196: neweof--;
197: }
198: #endif
199:
200: /* Set symbol size and relocation info values to 0. */
201: ep->a_syms = ep->a_trsize = ep->a_drsize = 0;
202:
203: /* Truncate the file. */
1.17 espie 204: *sz = neweof - (char *)ep;
1.1 deraadt 205:
206: return 0;
207: }
208:
209: int
1.20 deraadt 210: s_stab(const char *fn, int fd, EXEC *ep, struct stat *sp, off_t *sz)
1.1 deraadt 211: {
1.15 mpech 212: int cnt, len;
1.18 espie 213: char *nstr, *nstrbase=0, *used=0, *p, *strbase;
1.15 mpech 214: NLIST *sym, *nsym;
1.11 espie 215: u_long allocsize;
216: int mid;
1.1 deraadt 217: NLIST *symbase;
1.18 espie 218: unsigned int *mapping=0;
219: int error=1;
220: unsigned int nsyms;
221: struct relocation_info *reloc_base;
222: unsigned int i, j;
1.1 deraadt 223:
224: /* Quit if no symbols. */
225: if (ep->a_syms == 0)
226: return 0;
227:
228: if (N_SYMOFF(*ep) >= sp->st_size) {
1.7 mickey 229: warnx("%s: bad symbol table", fn);
1.1 deraadt 230: return 1;
231: }
232:
1.11 espie 233: mid = N_GETMID(*ep);
234:
1.1 deraadt 235: /*
236: * Initialize old and new symbol pointers. They both point to the
237: * beginning of the symbol table in memory, since we're deleting
238: * entries.
239: */
240: sym = nsym = symbase = (NLIST *)((char *)ep + N_SYMOFF(*ep));
241:
242: /*
243: * Allocate space for the new string table, initialize old and
244: * new string pointers. Handle the extra long at the beginning
245: * of the string table.
246: */
247: strbase = (char *)ep + N_STROFF(*ep);
1.23 mickey 248: allocsize = fix_32_order(*(u_long *)strbase, mid);
1.11 espie 249: if ((nstrbase = malloc((u_int) allocsize)) == NULL) {
1.7 mickey 250: warnx("%s", strerror(ENOMEM));
1.18 espie 251: goto end;
1.1 deraadt 252: }
253: nstr = nstrbase + sizeof(u_long);
254:
1.18 espie 255: /* okay, so we also need to keep symbol numbers for relocations. */
256: nsyms = ep->a_syms/ sizeof(NLIST);
257: used = calloc(nsyms, 1);
258: if (!used) {
259: warnx("%s", strerror(ENOMEM));
260: goto end;
261: }
1.24 deraadt 262: mapping = calloc(nsyms, sizeof(unsigned int));
1.18 espie 263: if (!mapping) {
264: warnx("%s", strerror(ENOMEM));
265: goto end;
266: }
267:
268: if ((ep->a_trsize || ep->a_drsize) && byte_sex(mid) != BYTE_ORDER) {
269: warnx("%s: cross-stripping not supported", fn);
270: goto end;
271: }
272:
273: /* first check the relocations for used symbols, and mark them */
274: /* text */
275: reloc_base = (struct relocation_info *) ((char *)ep + N_TRELOFF(*ep));
276: if (N_TRELOFF(*ep) + ep->a_trsize > sp->st_size) {
277: warnx("%s: bad text relocation", fn);
278: goto end;
279: }
280: for (i = 0; i < ep->a_trsize / sizeof(struct relocation_info); i++) {
281: if (!reloc_base[i].r_extern)
282: continue;
283: if (reloc_base[i].r_symbolnum > nsyms) {
284: warnx("%s: bad symbol number in text relocation", fn);
285: goto end;
286: }
287: used[reloc_base[i].r_symbolnum] = 1;
288: }
289: /* data */
290: reloc_base = (struct relocation_info *) ((char *)ep + N_DRELOFF(*ep));
291: if (N_DRELOFF(*ep) + ep->a_drsize > sp->st_size) {
292: warnx("%s: bad data relocation", fn);
293: goto end;
294: }
295: for (i = 0; i < ep->a_drsize / sizeof(struct relocation_info); i++) {
296: if (!reloc_base[i].r_extern)
297: continue;
298: if (reloc_base[i].r_symbolnum > nsyms) {
299: warnx("%s: bad symbol number in data relocation", fn);
300: goto end;
301: }
302: used[reloc_base[i].r_symbolnum] = 1;
303: }
304:
1.1 deraadt 305: /*
306: * Read through the symbol table. For each non-debugging symbol,
307: * copy it and save its string in the new string table. Keep
308: * track of the number of symbols.
309: */
1.18 espie 310: for (cnt = nsyms, i = 0, j = 0; cnt--; ++sym, ++i) {
1.11 espie 311: fix_nlist_order(sym, mid);
1.1 deraadt 312: if (!(sym->n_type & N_STAB) && sym->strx) {
313: *nsym = *sym;
314: nsym->strx = nstr - nstrbase;
315: p = strbase + sym->strx;
1.18 espie 316: if (xflag && !used[i] &&
1.1 deraadt 317: (!(sym->n_type & N_EXT) ||
318: (sym->n_type & ~N_EXT) == N_FN ||
319: strcmp(p, "gcc_compiled.") == 0 ||
320: strcmp(p, "gcc2_compiled.") == 0 ||
321: strncmp(p, "___gnu_compiled_", 16) == 0)) {
322: continue;
323: }
324: len = strlen(p) + 1;
1.18 espie 325: mapping[i] = j++;
1.17 espie 326: if (N_STROFF(*ep) + sym->strx + len > sp->st_size) {
327: warnx("%s: bad symbol table", fn);
1.18 espie 328: goto end;
1.17 espie 329: }
1.1 deraadt 330: bcopy(p, nstr, len);
331: nstr += len;
1.11 espie 332: fix_nlist_order(nsym++, mid);
1.1 deraadt 333: }
1.11 espie 334: }
1.1 deraadt 335:
1.18 espie 336: /* renumber symbol relocations */
337: /* text */
338: reloc_base = (struct relocation_info *) ((char *)ep + N_TRELOFF(*ep));
339: for (i = 0; i < ep->a_trsize / sizeof(struct relocation_info); i++) {
340: if (!reloc_base[i].r_extern)
341: continue;
342: reloc_base[i].r_symbolnum = mapping[reloc_base[i].r_symbolnum];
343: }
344: /* data */
345: reloc_base = (struct relocation_info *) ((char *)ep + N_DRELOFF(*ep));
346: for (i = 0; i < ep->a_drsize / sizeof(struct relocation_info); i++) {
347: if (!reloc_base[i].r_extern)
348: continue;
349: reloc_base[i].r_symbolnum = mapping[reloc_base[i].r_symbolnum];
350: }
351:
1.1 deraadt 352: /* Fill in new symbol table size. */
353: ep->a_syms = (nsym - symbase) * sizeof(NLIST);
354:
355: /* Fill in the new size of the string table. */
1.11 espie 356: len = nstr - nstrbase;
1.23 mickey 357: *(u_long *)nstrbase = fix_32_order(len, mid);
1.1 deraadt 358:
359: /*
360: * Copy the new string table into place. Nsym should be pointing
361: * at the address past the last symbol entry.
362: */
363: bcopy(nstrbase, (void *)nsym, len);
1.18 espie 364: error = 0;
365: end:
1.1 deraadt 366: free(nstrbase);
1.18 espie 367: free(used);
368: free(mapping);
1.1 deraadt 369:
370: /* Truncate to the current length. */
1.17 espie 371: *sz = (char *)nsym + len - (char *)ep;
1.1 deraadt 372:
1.18 espie 373: return error;
1.1 deraadt 374: }
375:
376: void
1.20 deraadt 377: usage(void)
1.1 deraadt 378: {
1.21 mickey 379: extern char *__progname;
380:
381: fprintf(stderr, "usage: %s [-dx] file ...\n", __progname);
1.1 deraadt 382: exit(1);
383: }
384:
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