1 /*
2 * recordmcount.c: construct a table of the locations of calls to 'mcount'
3 * so that ftrace can find them quickly.
4 * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved.
5 * Licensed under the GNU General Public License, version 2 (GPLv2).
6 *
7 * Restructured to fit Linux format, as well as other updates:
8 * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
9 */
10
11 /*
12 * Strategy: alter the .o file in-place.
13 *
14 * Append a new STRTAB that has the new section names, followed by a new array
15 * ElfXX_Shdr[] that has the new section headers, followed by the section
16 * contents for __mcount_loc and its relocations. The old shstrtab strings,
17 * and the old ElfXX_Shdr[] array, remain as "garbage" (commonly, a couple
18 * kilobytes.) Subsequent processing by /bin/ld (or the kernel module loader)
19 * will ignore the garbage regions, because they are not designated by the
20 * new .e_shoff nor the new ElfXX_Shdr[]. [In order to remove the garbage,
21 * then use "ld -r" to create a new file that omits the garbage.]
22 */
23
24 #include <sys/types.h>
25 #include <sys/mman.h>
26 #include <sys/stat.h>
27 #include <getopt.h>
28 #include <elf.h>
29 #include <fcntl.h>
30 #include <setjmp.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <unistd.h>
35
36 /*
37 * glibc synced up and added the metag number but didn't add the relocations.
38 * Work around this in a crude manner for now.
39 */
40 #ifndef EM_METAG
41 #define EM_METAG 174
42 #endif
43 #ifndef R_METAG_ADDR32
44 #define R_METAG_ADDR32 2
45 #endif
46 #ifndef R_METAG_NONE
47 #define R_METAG_NONE 3
48 #endif
49
50 #ifndef EM_AARCH64
51 #define EM_AARCH64 183
52 #define R_AARCH64_NONE 0
53 #define R_AARCH64_ABS64 257
54 #endif
55
56 #define R_ARM_PC24 1
57 #define R_ARM_THM_CALL 10
58 #define R_ARM_CALL 28
59
60 static int fd_map; /* File descriptor for file being modified. */
61 static int mmap_failed; /* Boolean flag. */
62 static char gpfx; /* prefix for global symbol name (sometimes '_') */
63 static struct stat sb; /* Remember .st_size, etc. */
64 static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */
65 static const char *altmcount; /* alternate mcount symbol name */
66 static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
67 static void *file_map; /* pointer of the mapped file */
68 static void *file_end; /* pointer to the end of the mapped file */
69 static int file_updated; /* flag to state file was changed */
70 static void *file_ptr; /* current file pointer location */
71 static void *file_append; /* added to the end of the file */
72 static size_t file_append_size; /* how much is added to end of file */
73
74 /* setjmp() return values */
75 enum {
76 SJ_SETJMP = 0, /* hardwired first return */
77 SJ_FAIL,
78 SJ_SUCCEED
79 };
80
81 /* Per-file resource cleanup when multiple files. */
82 static void
cleanup(void)83 cleanup(void)
84 {
85 if (!mmap_failed)
86 munmap(file_map, sb.st_size);
87 else
88 free(file_map);
89 file_map = NULL;
90 free(file_append);
91 file_append = NULL;
92 file_append_size = 0;
93 file_updated = 0;
94 }
95
96 static void __attribute__((noreturn))
fail_file(void)97 fail_file(void)
98 {
99 cleanup();
100 longjmp(jmpenv, SJ_FAIL);
101 }
102
103 static void __attribute__((noreturn))
succeed_file(void)104 succeed_file(void)
105 {
106 cleanup();
107 longjmp(jmpenv, SJ_SUCCEED);
108 }
109
110 /* ulseek, uread, ...: Check return value for errors. */
111
112 static off_t
ulseek(int const fd,off_t const offset,int const whence)113 ulseek(int const fd, off_t const offset, int const whence)
114 {
115 switch (whence) {
116 case SEEK_SET:
117 file_ptr = file_map + offset;
118 break;
119 case SEEK_CUR:
120 file_ptr += offset;
121 break;
122 case SEEK_END:
123 file_ptr = file_map + (sb.st_size - offset);
124 break;
125 }
126 if (file_ptr < file_map) {
127 fprintf(stderr, "lseek: seek before file\n");
128 fail_file();
129 }
130 return file_ptr - file_map;
131 }
132
133 static size_t
uread(int const fd,void * const buf,size_t const count)134 uread(int const fd, void *const buf, size_t const count)
135 {
136 size_t const n = read(fd, buf, count);
137 if (n != count) {
138 perror("read");
139 fail_file();
140 }
141 return n;
142 }
143
144 static size_t
uwrite(int const fd,void const * const buf,size_t const count)145 uwrite(int const fd, void const *const buf, size_t const count)
146 {
147 size_t cnt = count;
148 off_t idx = 0;
149
150 file_updated = 1;
151
152 if (file_ptr + count >= file_end) {
153 off_t aoffset = (file_ptr + count) - file_end;
154
155 if (aoffset > file_append_size) {
156 file_append = realloc(file_append, aoffset);
157 file_append_size = aoffset;
158 }
159 if (!file_append) {
160 perror("write");
161 fail_file();
162 }
163 if (file_ptr < file_end) {
164 cnt = file_end - file_ptr;
165 } else {
166 cnt = 0;
167 idx = aoffset - count;
168 }
169 }
170
171 if (cnt)
172 memcpy(file_ptr, buf, cnt);
173
174 if (cnt < count)
175 memcpy(file_append + idx, buf + cnt, count - cnt);
176
177 file_ptr += count;
178 return count;
179 }
180
181 static void *
umalloc(size_t size)182 umalloc(size_t size)
183 {
184 void *const addr = malloc(size);
185 if (addr == 0) {
186 fprintf(stderr, "malloc failed: %zu bytes\n", size);
187 fail_file();
188 }
189 return addr;
190 }
191
192 static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
193 static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 };
194 static unsigned char *ideal_nop;
195
196 static char rel_type_nop;
197
198 static int (*make_nop)(void *map, size_t const offset);
199
make_nop_x86(void * map,size_t const offset)200 static int make_nop_x86(void *map, size_t const offset)
201 {
202 uint32_t *ptr;
203 unsigned char *op;
204
205 /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */
206 ptr = map + offset;
207 if (*ptr != 0)
208 return -1;
209
210 op = map + offset - 1;
211 if (*op != 0xe8)
212 return -1;
213
214 /* convert to nop */
215 ulseek(fd_map, offset - 1, SEEK_SET);
216 uwrite(fd_map, ideal_nop, 5);
217 return 0;
218 }
219
220 static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */
221 static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */
222 static unsigned char *ideal_nop4_arm;
223
224 static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */
225 static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */
226 static unsigned char *bl_mcount_arm;
227
228 static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */
229 static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */
230 static unsigned char *push_arm;
231
232 static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */
233 static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */
234 static unsigned char *ideal_nop2_thumb;
235
236 static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */
237 static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */
238 static unsigned char *push_bl_mcount_thumb;
239
make_nop_arm(void * map,size_t const offset)240 static int make_nop_arm(void *map, size_t const offset)
241 {
242 char *ptr;
243 int cnt = 1;
244 int nop_size;
245 size_t off = offset;
246
247 ptr = map + offset;
248 if (memcmp(ptr, bl_mcount_arm, 4) == 0) {
249 if (memcmp(ptr - 4, push_arm, 4) == 0) {
250 off -= 4;
251 cnt = 2;
252 }
253 ideal_nop = ideal_nop4_arm;
254 nop_size = 4;
255 } else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) {
256 cnt = 3;
257 nop_size = 2;
258 off -= 2;
259 ideal_nop = ideal_nop2_thumb;
260 } else
261 return -1;
262
263 /* Convert to nop */
264 ulseek(fd_map, off, SEEK_SET);
265
266 do {
267 uwrite(fd_map, ideal_nop, nop_size);
268 } while (--cnt > 0);
269
270 return 0;
271 }
272
273 static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5};
make_nop_arm64(void * map,size_t const offset)274 static int make_nop_arm64(void *map, size_t const offset)
275 {
276 uint32_t *ptr;
277
278 ptr = map + offset;
279 /* bl <_mcount> is 0x94000000 before relocation */
280 if (*ptr != 0x94000000)
281 return -1;
282
283 /* Convert to nop */
284 ulseek(fd_map, offset, SEEK_SET);
285 uwrite(fd_map, ideal_nop, 4);
286 return 0;
287 }
288
289 /*
290 * Get the whole file as a programming convenience in order to avoid
291 * malloc+lseek+read+free of many pieces. If successful, then mmap
292 * avoids copying unused pieces; else just read the whole file.
293 * Open for both read and write; new info will be appended to the file.
294 * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr
295 * do not propagate to the file until an explicit overwrite at the last.
296 * This preserves most aspects of consistency (all except .st_size)
297 * for simultaneous readers of the file while we are appending to it.
298 * However, multiple writers still are bad. We choose not to use
299 * locking because it is expensive and the use case of kernel build
300 * makes multiple writers unlikely.
301 */
mmap_file(char const * fname)302 static void *mmap_file(char const *fname)
303 {
304 fd_map = open(fname, O_RDONLY);
305 if (fd_map < 0 || fstat(fd_map, &sb) < 0) {
306 perror(fname);
307 fail_file();
308 }
309 if (!S_ISREG(sb.st_mode)) {
310 fprintf(stderr, "not a regular file: %s\n", fname);
311 fail_file();
312 }
313 file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
314 fd_map, 0);
315 mmap_failed = 0;
316 if (file_map == MAP_FAILED) {
317 mmap_failed = 1;
318 file_map = umalloc(sb.st_size);
319 uread(fd_map, file_map, sb.st_size);
320 }
321 close(fd_map);
322
323 file_end = file_map + sb.st_size;
324
325 return file_map;
326 }
327
write_file(const char * fname)328 static void write_file(const char *fname)
329 {
330 char tmp_file[strlen(fname) + 4];
331 size_t n;
332
333 if (!file_updated)
334 return;
335
336 sprintf(tmp_file, "%s.rc", fname);
337
338 /*
339 * After reading the entire file into memory, delete it
340 * and write it back, to prevent weird side effects of modifying
341 * an object file in place.
342 */
343 fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode);
344 if (fd_map < 0) {
345 perror(fname);
346 fail_file();
347 }
348 n = write(fd_map, file_map, sb.st_size);
349 if (n != sb.st_size) {
350 perror("write");
351 fail_file();
352 }
353 if (file_append_size) {
354 n = write(fd_map, file_append, file_append_size);
355 if (n != file_append_size) {
356 perror("write");
357 fail_file();
358 }
359 }
360 close(fd_map);
361 if (rename(tmp_file, fname) < 0) {
362 perror(fname);
363 fail_file();
364 }
365 }
366
367 /* w8rev, w8nat, ...: Handle endianness. */
368
w8rev(uint64_t const x)369 static uint64_t w8rev(uint64_t const x)
370 {
371 return ((0xff & (x >> (0 * 8))) << (7 * 8))
372 | ((0xff & (x >> (1 * 8))) << (6 * 8))
373 | ((0xff & (x >> (2 * 8))) << (5 * 8))
374 | ((0xff & (x >> (3 * 8))) << (4 * 8))
375 | ((0xff & (x >> (4 * 8))) << (3 * 8))
376 | ((0xff & (x >> (5 * 8))) << (2 * 8))
377 | ((0xff & (x >> (6 * 8))) << (1 * 8))
378 | ((0xff & (x >> (7 * 8))) << (0 * 8));
379 }
380
w4rev(uint32_t const x)381 static uint32_t w4rev(uint32_t const x)
382 {
383 return ((0xff & (x >> (0 * 8))) << (3 * 8))
384 | ((0xff & (x >> (1 * 8))) << (2 * 8))
385 | ((0xff & (x >> (2 * 8))) << (1 * 8))
386 | ((0xff & (x >> (3 * 8))) << (0 * 8));
387 }
388
w2rev(uint16_t const x)389 static uint32_t w2rev(uint16_t const x)
390 {
391 return ((0xff & (x >> (0 * 8))) << (1 * 8))
392 | ((0xff & (x >> (1 * 8))) << (0 * 8));
393 }
394
w8nat(uint64_t const x)395 static uint64_t w8nat(uint64_t const x)
396 {
397 return x;
398 }
399
w4nat(uint32_t const x)400 static uint32_t w4nat(uint32_t const x)
401 {
402 return x;
403 }
404
w2nat(uint16_t const x)405 static uint32_t w2nat(uint16_t const x)
406 {
407 return x;
408 }
409
410 static uint64_t (*w8)(uint64_t);
411 static uint32_t (*w)(uint32_t);
412 static uint32_t (*w2)(uint16_t);
413
414 /* Names of the sections that could contain calls to mcount. */
415 static int
is_mcounted_section_name(char const * const txtname)416 is_mcounted_section_name(char const *const txtname)
417 {
418 return strcmp(".text", txtname) == 0 ||
419 strcmp(".init.text", txtname) == 0 ||
420 strcmp(".ref.text", txtname) == 0 ||
421 strcmp(".sched.text", txtname) == 0 ||
422 strcmp(".spinlock.text", txtname) == 0 ||
423 strcmp(".irqentry.text", txtname) == 0 ||
424 strcmp(".softirqentry.text", txtname) == 0 ||
425 strcmp(".kprobes.text", txtname) == 0 ||
426 strcmp(".cpuidle.text", txtname) == 0 ||
427 (strncmp(".text.", txtname, 6) == 0 &&
428 strcmp(".text..ftrace", txtname) != 0);
429 }
430
431 /* 32 bit and 64 bit are very similar */
432 #include "recordmcount.h"
433 #define RECORD_MCOUNT_64
434 #include "recordmcount.h"
435
arm_is_fake_mcount(Elf32_Rel const * rp)436 static int arm_is_fake_mcount(Elf32_Rel const *rp)
437 {
438 switch (ELF32_R_TYPE(w(rp->r_info))) {
439 case R_ARM_THM_CALL:
440 case R_ARM_CALL:
441 case R_ARM_PC24:
442 return 0;
443 }
444
445 return 1;
446 }
447
448 /* 64-bit EM_MIPS has weird ELF64_Rela.r_info.
449 * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
450 * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40]
451 * to imply the order of the members; the spec does not say so.
452 * typedef unsigned char Elf64_Byte;
453 * fails on MIPS64 because their <elf.h> already has it!
454 */
455
456 typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */
457
458 union mips_r_info {
459 Elf64_Xword r_info;
460 struct {
461 Elf64_Word r_sym; /* Symbol index. */
462 myElf64_Byte r_ssym; /* Special symbol. */
463 myElf64_Byte r_type3; /* Third relocation. */
464 myElf64_Byte r_type2; /* Second relocation. */
465 myElf64_Byte r_type; /* First relocation. */
466 } r_mips;
467 };
468
MIPS64_r_sym(Elf64_Rel const * rp)469 static uint64_t MIPS64_r_sym(Elf64_Rel const *rp)
470 {
471 return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym);
472 }
473
MIPS64_r_info(Elf64_Rel * const rp,unsigned sym,unsigned type)474 static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type)
475 {
476 rp->r_info = ((union mips_r_info){
477 .r_mips = { .r_sym = w(sym), .r_type = type }
478 }).r_info;
479 }
480
481 static void
do_file(char const * const fname)482 do_file(char const *const fname)
483 {
484 Elf32_Ehdr *const ehdr = mmap_file(fname);
485 unsigned int reltype = 0;
486
487 w = w4nat;
488 w2 = w2nat;
489 w8 = w8nat;
490 switch (ehdr->e_ident[EI_DATA]) {
491 static unsigned int const endian = 1;
492 default:
493 fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
494 ehdr->e_ident[EI_DATA], fname);
495 fail_file();
496 break;
497 case ELFDATA2LSB:
498 if (*(unsigned char const *)&endian != 1) {
499 /* main() is big endian, file.o is little endian. */
500 w = w4rev;
501 w2 = w2rev;
502 w8 = w8rev;
503 }
504 ideal_nop4_arm = ideal_nop4_arm_le;
505 bl_mcount_arm = bl_mcount_arm_le;
506 push_arm = push_arm_le;
507 ideal_nop2_thumb = ideal_nop2_thumb_le;
508 push_bl_mcount_thumb = push_bl_mcount_thumb_le;
509 break;
510 case ELFDATA2MSB:
511 if (*(unsigned char const *)&endian != 0) {
512 /* main() is little endian, file.o is big endian. */
513 w = w4rev;
514 w2 = w2rev;
515 w8 = w8rev;
516 }
517 ideal_nop4_arm = ideal_nop4_arm_be;
518 bl_mcount_arm = bl_mcount_arm_be;
519 push_arm = push_arm_be;
520 ideal_nop2_thumb = ideal_nop2_thumb_be;
521 push_bl_mcount_thumb = push_bl_mcount_thumb_be;
522 break;
523 } /* end switch */
524 if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0
525 || w2(ehdr->e_type) != ET_REL
526 || ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
527 fprintf(stderr, "unrecognized ET_REL file %s\n", fname);
528 fail_file();
529 }
530
531 gpfx = 0;
532 switch (w2(ehdr->e_machine)) {
533 default:
534 fprintf(stderr, "unrecognized e_machine %d %s\n",
535 w2(ehdr->e_machine), fname);
536 fail_file();
537 break;
538 case EM_386:
539 reltype = R_386_32;
540 rel_type_nop = R_386_NONE;
541 make_nop = make_nop_x86;
542 ideal_nop = ideal_nop5_x86_32;
543 mcount_adjust_32 = -1;
544 break;
545 case EM_ARM: reltype = R_ARM_ABS32;
546 altmcount = "__gnu_mcount_nc";
547 make_nop = make_nop_arm;
548 rel_type_nop = R_ARM_NONE;
549 is_fake_mcount32 = arm_is_fake_mcount;
550 break;
551 case EM_AARCH64:
552 reltype = R_AARCH64_ABS64;
553 make_nop = make_nop_arm64;
554 rel_type_nop = R_AARCH64_NONE;
555 ideal_nop = ideal_nop4_arm64;
556 gpfx = '_';
557 break;
558 case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break;
559 case EM_METAG: reltype = R_METAG_ADDR32;
560 altmcount = "_mcount_wrapper";
561 rel_type_nop = R_METAG_NONE;
562 /* We happen to have the same requirement as MIPS */
563 is_fake_mcount32 = MIPS32_is_fake_mcount;
564 break;
565 case EM_MIPS: /* reltype: e_class */ gpfx = '_'; break;
566 case EM_PPC: reltype = R_PPC_ADDR32; gpfx = '_'; break;
567 case EM_PPC64: reltype = R_PPC64_ADDR64; gpfx = '_'; break;
568 case EM_S390: /* reltype: e_class */ gpfx = '_'; break;
569 case EM_SH: reltype = R_SH_DIR32; break;
570 case EM_SPARCV9: reltype = R_SPARC_64; gpfx = '_'; break;
571 case EM_X86_64:
572 make_nop = make_nop_x86;
573 ideal_nop = ideal_nop5_x86_64;
574 reltype = R_X86_64_64;
575 rel_type_nop = R_X86_64_NONE;
576 mcount_adjust_64 = -1;
577 break;
578 } /* end switch */
579
580 switch (ehdr->e_ident[EI_CLASS]) {
581 default:
582 fprintf(stderr, "unrecognized ELF class %d %s\n",
583 ehdr->e_ident[EI_CLASS], fname);
584 fail_file();
585 break;
586 case ELFCLASS32:
587 if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
588 || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
589 fprintf(stderr,
590 "unrecognized ET_REL file: %s\n", fname);
591 fail_file();
592 }
593 if (w2(ehdr->e_machine) == EM_MIPS) {
594 reltype = R_MIPS_32;
595 is_fake_mcount32 = MIPS32_is_fake_mcount;
596 }
597 do32(ehdr, fname, reltype);
598 break;
599 case ELFCLASS64: {
600 Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
601 if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr)
602 || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
603 fprintf(stderr,
604 "unrecognized ET_REL file: %s\n", fname);
605 fail_file();
606 }
607 if (w2(ghdr->e_machine) == EM_S390) {
608 reltype = R_390_64;
609 mcount_adjust_64 = -14;
610 }
611 if (w2(ghdr->e_machine) == EM_MIPS) {
612 reltype = R_MIPS_64;
613 Elf64_r_sym = MIPS64_r_sym;
614 Elf64_r_info = MIPS64_r_info;
615 is_fake_mcount64 = MIPS64_is_fake_mcount;
616 }
617 do64(ghdr, fname, reltype);
618 break;
619 }
620 } /* end switch */
621
622 write_file(fname);
623 cleanup();
624 }
625
626 int
main(int argc,char * argv[])627 main(int argc, char *argv[])
628 {
629 const char ftrace[] = "/ftrace.o";
630 int ftrace_size = sizeof(ftrace) - 1;
631 int n_error = 0; /* gcc-4.3.0 false positive complaint */
632 int c;
633 int i;
634
635 while ((c = getopt(argc, argv, "w")) >= 0) {
636 switch (c) {
637 case 'w':
638 warn_on_notrace_sect = 1;
639 break;
640 default:
641 fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
642 return 0;
643 }
644 }
645
646 if ((argc - optind) < 1) {
647 fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
648 return 0;
649 }
650
651 /* Process each file in turn, allowing deep failure. */
652 for (i = optind; i < argc; i++) {
653 char *file = argv[i];
654 int const sjval = setjmp(jmpenv);
655 int len;
656
657 /*
658 * The file kernel/trace/ftrace.o references the mcount
659 * function but does not call it. Since ftrace.o should
660 * not be traced anyway, we just skip it.
661 */
662 len = strlen(file);
663 if (len >= ftrace_size &&
664 strcmp(file + (len - ftrace_size), ftrace) == 0)
665 continue;
666
667 switch (sjval) {
668 default:
669 fprintf(stderr, "internal error: %s\n", file);
670 exit(1);
671 break;
672 case SJ_SETJMP: /* normal sequence */
673 /* Avoid problems if early cleanup() */
674 fd_map = -1;
675 mmap_failed = 1;
676 file_map = NULL;
677 file_ptr = NULL;
678 file_updated = 0;
679 do_file(file);
680 break;
681 case SJ_FAIL: /* error in do_file or below */
682 fprintf(stderr, "%s: failed\n", file);
683 ++n_error;
684 break;
685 case SJ_SUCCEED: /* premature success */
686 /* do nothing */
687 break;
688 } /* end switch */
689 }
690 return !!n_error;
691 }
692