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Linux/scripts/recordmcount.c

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

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