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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 | } |