1 /* $Id: btfixupprep.c,v 1.6 2001/08/22 15:27:47 davem Exp $
2    Simple utility to prepare vmlinux image for sparc.
3    Resolves all BTFIXUP uses and settings and creates
4    a special .s object to link to the image.
5 
6    Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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
10    the Free Software Foundation; either version 2 of the License, or
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
20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
21 
22 #include <stdio.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <errno.h>
26 #include <unistd.h>
27 #include <stdlib.h>
28 #include <malloc.h>
29 
30 #define MAXSYMS 1024
31 
32 static char *symtab = "SYMBOL TABLE:";
33 static char *relrec = "RELOCATION RECORDS FOR [";
34 static int rellen;
35 static int symlen;
36 int mode;
37 
38 struct _btfixup;
39 
40 typedef struct _btfixuprel {
41 	char *sect;
42 	unsigned long offset;
43 	struct _btfixup *f;
44 	int frel;
45 	struct _btfixuprel *next;
46 } btfixuprel;
47 
48 typedef struct _btfixup {
49 	int type;
50 	int setinitval;
51 	unsigned int initval;
52 	char *initvalstr;
53 	char *name;
54 	btfixuprel *rel;
55 } btfixup;
56 
57 btfixup array[MAXSYMS];
58 int last = 0;
59 char buffer[1024];
60 unsigned long lastfoffset = -1;
61 unsigned long lastfrelno;
62 btfixup *lastf;
63 
64 void fatal(void) __attribute__((noreturn));
fatal(void)65 void fatal(void)
66 {
67 	fprintf(stderr, "Malformed output from objdump\n%s\n", buffer);
68 	exit(1);
69 }
70 
find(int type,char * name)71 btfixup *find(int type, char *name)
72 {
73 	int i;
74 	for (i = 0; i < last; i++) {
75 		if (array[i].type == type && !strcmp(array[i].name, name))
76 			return array + i;
77 	}
78 	array[last].type = type;
79 	array[last].name = strdup(name);
80 	array[last].setinitval = 0;
81 	if (!array[last].name) fatal();
82 	array[last].rel = NULL;
83 	last++;
84 	if (last >= MAXSYMS) {
85 		fprintf(stderr, "Ugh. Something strange. More than %d different BTFIXUP symbols\n", MAXSYMS);
86 		exit(1);
87 	}
88 	return array + last - 1;
89 }
90 
set_mode(char * buffer)91 void set_mode (char *buffer)
92 {
93   	for (mode = 0;; mode++)
94 		if (buffer[mode] < '0' || buffer[mode] > '9')
95 			break;
96 	if (mode != 8 && mode != 16)
97 		fatal();
98 }
99 
100 
main(int argc,char ** argv)101 int main(int argc,char **argv)
102 {
103 	char *p, *q;
104 	char *sect;
105 	int i, j, k;
106 	unsigned int initval;
107 	int shift;
108 	btfixup *f;
109 	btfixuprel *r, **rr;
110 	unsigned long offset;
111 	char *initvalstr;
112 
113 	symlen = strlen(symtab);
114 	while (fgets (buffer, 1024, stdin) != NULL)
115 		if (!strncmp (buffer, symtab, symlen))
116 			goto main0;
117 	fatal();
118 main0:
119 	rellen = strlen(relrec);
120 	while (fgets (buffer, 1024, stdin) != NULL)
121 		if (!strncmp (buffer, relrec, rellen))
122 			goto main1;
123 	fatal();
124 main1:
125 	sect = malloc(strlen (buffer + rellen) + 1);
126 	if (!sect) fatal();
127 	strcpy (sect, buffer + rellen);
128 	p = strchr (sect, ']');
129 	if (!p) fatal();
130 	*p = 0;
131 	if (fgets (buffer, 1024, stdin) == NULL)
132 		fatal();
133 	while (fgets (buffer, 1024, stdin) != NULL) {
134 		int nbase;
135 		if (!strncmp (buffer, relrec, rellen))
136 			goto main1;
137 		if (mode == 0)
138 			set_mode (buffer);
139 		p = strchr (buffer, '\n');
140 		if (p) *p = 0;
141 		if (strlen (buffer) < 22+mode)
142 			continue;
143 		if (strncmp (buffer + mode, " R_SPARC_", 9))
144 			continue;
145 		nbase = 27 - 8 + mode;
146 		if (buffer[nbase] != '_' || buffer[nbase+1] != '_' || buffer[nbase+2] != '_')
147 			continue;
148 		switch (buffer[nbase+3]) {
149 			case 'f':	/* CALL */
150 			case 'b':	/* BLACKBOX */
151 			case 's':	/* SIMM13 */
152 			case 'a':	/* HALF */
153 			case 'h':	/* SETHI */
154 			case 'i':	/* INT */
155 				break;
156 			default:
157 				continue;
158 		}
159 		p = strchr (buffer + nbase+5, '+');
160 		if (p) *p = 0;
161 		shift = nbase + 5;
162 		if (buffer[nbase+4] == 's' && buffer[nbase+5] == '_') {
163 			shift = nbase + 6;
164 			if (strcmp (sect, ".text.init")) {
165 				fprintf(stderr, "Wrong use of '%s' BTFIXUPSET.\nBTFIXUPSET_CALL can be used only in __init sections\n", buffer+shift);
166 				exit(1);
167 			}
168 		} else if (buffer[nbase+4] != '_')
169 			continue;
170 		if (!strcmp (sect, ".text.exit"))
171 			continue;
172 		if (strcmp (sect, ".text") && strcmp (sect, ".text.init") && strcmp (sect, ".fixup") && (strcmp (sect, "__ksymtab") || buffer[nbase+3] != 'f')) {
173 			if (buffer[nbase+3] == 'f')
174 				fprintf(stderr, "Wrong use of '%s' in '%s' section. It can be only used in .text, .text.init, .fixup and __ksymtab\n", buffer + shift, sect);
175 			else
176 				fprintf(stderr, "Wrong use of '%s' in '%s' section. It can be only used in .text, .fixup and .text.init\n", buffer + shift, sect);
177 			exit(1);
178 		}
179 		p = strstr (buffer + shift, "__btset_");
180 		if (p && buffer[nbase+4] == 's') {
181 			fprintf(stderr, "__btset_ in BTFIXUP name can only be used when defining the variable, not for setting\n%s\n", buffer);
182 			exit(1);
183 		}
184 		initval = 0;
185 		initvalstr = NULL;
186 		if (p) {
187 			if (p[8] != '0' || p[9] != 'x') {
188 				fprintf(stderr, "Pre-initialized values can be only initialized with hexadecimal constants starting 0x\n%s\n", buffer);
189 				exit(1);
190 			}
191 			initval = strtoul(p + 10, &q, 16);
192 			if (*q || !initval) {
193 				fprintf(stderr, "Pre-initialized values can be only in the form name__btset_0xXXXXXXXX where X are hex digits.\nThey cannot be name__btset_0x00000000 though. Use BTFIXUPDEF_XX instead of BTFIXUPDEF_XX_INIT then.\n%s\n", buffer);
194 				exit(1);
195 			}
196 			initvalstr = p + 10;
197 			*p = 0;
198 		}
199 		f = find(buffer[nbase+3], buffer + shift);
200 		if (buffer[nbase+4] == 's')
201 			continue;
202 		switch (buffer[nbase+3]) {
203 		case 'f':
204 			if (initval) {
205 				fprintf(stderr, "Cannot use pre-initalized fixups for calls\n%s\n", buffer);
206 				exit(1);
207 			}
208 			if (!strcmp (sect, "__ksymtab")) {
209 				if (strncmp (buffer + mode+9, "32        ", 10)) {
210 					fprintf(stderr, "BTFIXUP_CALL in EXPORT_SYMBOL results in relocation other than R_SPARC_32\n\%s\n", buffer);
211 					exit(1);
212 				}
213 			} else if (strncmp (buffer + mode+9, "WDISP30   ", 10) &&
214 				   strncmp (buffer + mode+9, "HI22      ", 10) &&
215 				   strncmp (buffer + mode+9, "LO10      ", 10)) {
216 				fprintf(stderr, "BTFIXUP_CALL results in relocation other than R_SPARC_WDISP30, R_SPARC_HI22 or R_SPARC_LO10\n%s\n", buffer);
217 				exit(1);
218 			}
219 			break;
220 		case 'b':
221 			if (initval) {
222 				fprintf(stderr, "Cannot use pre-initialized fixups for blackboxes\n%s\n", buffer);
223 				exit(1);
224 			}
225 			if (strncmp (buffer + mode+9, "HI22      ", 10)) {
226 				fprintf(stderr, "BTFIXUP_BLACKBOX results in relocation other than R_SPARC_HI22\n%s\n", buffer);
227 				exit(1);
228 			}
229 			break;
230 		case 's':
231 			if (initval + 0x1000 >= 0x2000) {
232 				fprintf(stderr, "Wrong initializer for SIMM13. Has to be from $fffff000 to $00000fff\n%s\n", buffer);
233 				exit(1);
234 			}
235 			if (strncmp (buffer + mode+9, "13        ", 10)) {
236 				fprintf(stderr, "BTFIXUP_SIMM13 results in relocation other than R_SPARC_13\n%s\n", buffer);
237 				exit(1);
238 			}
239 			break;
240 		case 'a':
241 			if (initval + 0x1000 >= 0x2000 && (initval & 0x3ff)) {
242 				fprintf(stderr, "Wrong initializer for HALF.\n%s\n", buffer);
243 				exit(1);
244 			}
245 			if (strncmp (buffer + mode+9, "13        ", 10)) {
246 				fprintf(stderr, "BTFIXUP_HALF results in relocation other than R_SPARC_13\n%s\n", buffer);
247 				exit(1);
248 			}
249 			break;
250 		case 'h':
251 			if (initval & 0x3ff) {
252 				fprintf(stderr, "Wrong initializer for SETHI. Cannot have set low 10 bits\n%s\n", buffer);
253 				exit(1);
254 			}
255 			if (strncmp (buffer + mode+9, "HI22      ", 10)) {
256 				fprintf(stderr, "BTFIXUP_SETHI results in relocation other than R_SPARC_HI22\n%s\n", buffer);
257 				exit(1);
258 			}
259 			break;
260 		case 'i':
261 			if (initval) {
262 				fprintf(stderr, "Cannot use pre-initalized fixups for INT\n%s\n", buffer);
263 				exit(1);
264 			}
265 			if (strncmp (buffer + mode+9, "HI22      ", 10) && strncmp (buffer + mode+9, "LO10      ", 10)) {
266 				fprintf(stderr, "BTFIXUP_INT results in relocation other than R_SPARC_HI22 and R_SPARC_LO10\n%s\n", buffer);
267 				exit(1);
268 			}
269 			break;
270 		}
271 		if (!f->setinitval) {
272 			f->initval = initval;
273 			if (initvalstr) {
274 				f->initvalstr = strdup(initvalstr);
275 				if (!f->initvalstr) fatal();
276 			}
277 			f->setinitval = 1;
278 		} else if (f->initval != initval) {
279 			fprintf(stderr, "Btfixup %s previously used with initializer %s which doesn't match with current initializer\n%s\n",
280 					f->name, f->initvalstr ? : "0x00000000", buffer);
281 			exit(1);
282 		} else if (initval && strcmp(f->initvalstr, initvalstr)) {
283 			fprintf(stderr, "Btfixup %s previously used with initializer %s which doesn't match with current initializer.\n"
284 					"Initializers have to match literally as well.\n%s\n",
285 					f->name, f->initvalstr, buffer);
286 			exit(1);
287 		}
288 		offset = strtoul(buffer, &q, 16);
289 		if (q != buffer + mode || (!offset && (mode == 8 ? strncmp (buffer, "00000000 ", 9) : strncmp (buffer, "0000000000000000 ", 17)))) {
290 			fprintf(stderr, "Malformed relocation address in\n%s\n", buffer);
291 			exit(1);
292 		}
293 		for (k = 0, r = f->rel, rr = &f->rel; r; rr = &r->next, r = r->next, k++)
294 			if (r->offset == offset && !strcmp(r->sect, sect)) {
295 				fprintf(stderr, "Ugh. One address has two relocation records\n");
296 				exit(1);
297 			}
298 		*rr = malloc(sizeof(btfixuprel));
299 		if (!*rr) fatal();
300 		(*rr)->offset = offset;
301 		(*rr)->f = NULL;
302 		if (buffer[nbase+3] == 'f') {
303 			lastf = f;
304 			lastfoffset = offset;
305 			lastfrelno = k;
306 		} else if (lastfoffset + 4 == offset) {
307 			(*rr)->f = lastf;
308 			(*rr)->frel = lastfrelno;
309 		}
310 		(*rr)->sect = sect;
311 		(*rr)->next = NULL;
312 	}
313 	printf("! Generated by btfixupprep. Do not edit.\n\n");
314 	printf("\t.section\t\".data.init\",#alloc,#write\n\t.align\t4\n\n");
315 	printf("\t.global\t___btfixup_start\n___btfixup_start:\n\n");
316 	for (i = 0; i < last; i++) {
317 		f = array + i;
318 		printf("\t.global\t___%cs_%s\n", f->type, f->name);
319 		if (f->type == 'f')
320 			printf("___%cs_%s:\n\t.word 0x%08x,0,0,", f->type, f->name, f->type << 24);
321 		else
322 			printf("___%cs_%s:\n\t.word 0x%08x,0,", f->type, f->name, f->type << 24);
323 		for (j = 0, r = f->rel; r != NULL; j++, r = r->next);
324 		if (j)
325 			printf("%d\n\t.word\t", j * 2);
326 		else
327 			printf("0\n");
328 		for (r = f->rel, j--; r != NULL; j--, r = r->next) {
329 			if (!strcmp (r->sect, ".text"))
330 				printf ("_stext+0x%08lx", r->offset);
331 			else if (!strcmp (r->sect, ".text.init"))
332 				printf ("__init_begin+0x%08lx", r->offset);
333 			else if (!strcmp (r->sect, "__ksymtab"))
334 				printf ("__start___ksymtab+0x%08lx", r->offset);
335 			else if (!strcmp (r->sect, ".fixup"))
336 				printf ("__start___fixup+0x%08lx", r->offset);
337 			else
338 				fatal();
339 			if (f->type == 'f' || !r->f)
340 				printf (",0");
341 			else
342 				printf (",___fs_%s+0x%08x", r->f->name, (4 + r->frel*2)*4 + 4);
343 			if (j) printf (",");
344 			else printf ("\n");
345 		}
346 		printf("\n");
347 	}
348 	printf("\n\t.global\t___btfixup_end\n___btfixup_end:\n");
349 	printf("\n\n! Define undefined references\n\n");
350 	for (i = 0; i < last; i++) {
351 		f = array + i;
352 		if (f->type == 'f') {
353 			printf("\t.global\t___f_%s\n", f->name);
354 			printf("___f_%s:\n", f->name);
355 		}
356 	}
357 	printf("\tretl\n\t nop\n\n");
358 	for (i = 0; i < last; i++) {
359 		f = array + i;
360 		if (f->type != 'f') {
361 			if (!f->initval) {
362 				printf("\t.global\t___%c_%s\n", f->type, f->name);
363 				printf("___%c_%s = 0\n", f->type, f->name);
364 			} else {
365 				printf("\t.global\t___%c_%s__btset_0x%s\n", f->type, f->name, f->initvalstr);
366 				printf("___%c_%s__btset_0x%s = 0x%08x\n", f->type, f->name, f->initvalstr, f->initval);
367 			}
368 		}
369 	}
370 	printf("\n\n");
371     	exit(0);
372 }
373