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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | /* | |
3 | * recordmcount.c: construct a table of the locations of calls to 'mcount' | |
4 | * so that ftrace can find them quickly. | |
5 | * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. | |
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 <stdio.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | #include <unistd.h> | |
34 | ||
35 | #ifndef EM_AARCH64 | |
36 | #define EM_AARCH64 183 | |
37 | #define R_AARCH64_NONE 0 | |
38 | #define R_AARCH64_ABS64 257 | |
39 | #endif | |
40 | ||
41 | #define R_ARM_PC24 1 | |
42 | #define R_ARM_THM_CALL 10 | |
43 | #define R_ARM_CALL 28 | |
44 | ||
45 | #define R_AARCH64_CALL26 283 | |
46 | ||
47 | static int fd_map; /* File descriptor for file being modified. */ | |
48 | static int mmap_failed; /* Boolean flag. */ | |
49 | static char gpfx; /* prefix for global symbol name (sometimes '_') */ | |
50 | static struct stat sb; /* Remember .st_size, etc. */ | |
51 | static const char *altmcount; /* alternate mcount symbol name */ | |
52 | static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */ | |
53 | static void *file_map; /* pointer of the mapped file */ | |
54 | static void *file_end; /* pointer to the end of the mapped file */ | |
55 | static int file_updated; /* flag to state file was changed */ | |
56 | static void *file_ptr; /* current file pointer location */ | |
57 | ||
58 | static void *file_append; /* added to the end of the file */ | |
59 | static size_t file_append_size; /* how much is added to end of file */ | |
60 | ||
61 | /* Per-file resource cleanup when multiple files. */ | |
62 | static void file_append_cleanup(void) | |
63 | { | |
64 | free(file_append); | |
65 | file_append = NULL; | |
66 | file_append_size = 0; | |
67 | file_updated = 0; | |
68 | } | |
69 | ||
70 | static void mmap_cleanup(void) | |
71 | { | |
72 | if (!mmap_failed) | |
73 | munmap(file_map, sb.st_size); | |
74 | else | |
75 | free(file_map); | |
76 | file_map = NULL; | |
77 | } | |
78 | ||
79 | /* ulseek, uwrite, ...: Check return value for errors. */ | |
80 | ||
81 | static off_t ulseek(off_t const offset, int const whence) | |
82 | { | |
83 | switch (whence) { | |
84 | case SEEK_SET: | |
85 | file_ptr = file_map + offset; | |
86 | break; | |
87 | case SEEK_CUR: | |
88 | file_ptr += offset; | |
89 | break; | |
90 | case SEEK_END: | |
91 | file_ptr = file_map + (sb.st_size - offset); | |
92 | break; | |
93 | } | |
94 | if (file_ptr < file_map) { | |
95 | fprintf(stderr, "lseek: seek before file\n"); | |
96 | return -1; | |
97 | } | |
98 | return file_ptr - file_map; | |
99 | } | |
100 | ||
101 | static ssize_t uwrite(void const *const buf, size_t const count) | |
102 | { | |
103 | size_t cnt = count; | |
104 | off_t idx = 0; | |
105 | ||
106 | file_updated = 1; | |
107 | ||
108 | if (file_ptr + count >= file_end) { | |
109 | off_t aoffset = (file_ptr + count) - file_end; | |
110 | ||
111 | if (aoffset > file_append_size) { | |
112 | file_append = realloc(file_append, aoffset); | |
113 | file_append_size = aoffset; | |
114 | } | |
115 | if (!file_append) { | |
116 | perror("write"); | |
117 | file_append_cleanup(); | |
118 | mmap_cleanup(); | |
119 | return -1; | |
120 | } | |
121 | if (file_ptr < file_end) { | |
122 | cnt = file_end - file_ptr; | |
123 | } else { | |
124 | cnt = 0; | |
125 | idx = aoffset - count; | |
126 | } | |
127 | } | |
128 | ||
129 | if (cnt) | |
130 | memcpy(file_ptr, buf, cnt); | |
131 | ||
132 | if (cnt < count) | |
133 | memcpy(file_append + idx, buf + cnt, count - cnt); | |
134 | ||
135 | file_ptr += count; | |
136 | return count; | |
137 | } | |
138 | ||
139 | static void * umalloc(size_t size) | |
140 | { | |
141 | void *const addr = malloc(size); | |
142 | if (addr == 0) { | |
143 | fprintf(stderr, "malloc failed: %zu bytes\n", size); | |
144 | file_append_cleanup(); | |
145 | mmap_cleanup(); | |
146 | return NULL; | |
147 | } | |
148 | return addr; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Get the whole file as a programming convenience in order to avoid | |
153 | * malloc+lseek+read+free of many pieces. If successful, then mmap | |
154 | * avoids copying unused pieces; else just read the whole file. | |
155 | * Open for both read and write; new info will be appended to the file. | |
156 | * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr | |
157 | * do not propagate to the file until an explicit overwrite at the last. | |
158 | * This preserves most aspects of consistency (all except .st_size) | |
159 | * for simultaneous readers of the file while we are appending to it. | |
160 | * However, multiple writers still are bad. We choose not to use | |
161 | * locking because it is expensive and the use case of kernel build | |
162 | * makes multiple writers unlikely. | |
163 | */ | |
164 | static void *mmap_file(char const *fname) | |
165 | { | |
166 | /* Avoid problems if early cleanup() */ | |
167 | fd_map = -1; | |
168 | mmap_failed = 1; | |
169 | file_map = NULL; | |
170 | file_ptr = NULL; | |
171 | file_updated = 0; | |
172 | sb.st_size = 0; | |
173 | ||
174 | fd_map = open(fname, O_RDONLY); | |
175 | if (fd_map < 0) { | |
176 | perror(fname); | |
177 | return NULL; | |
178 | } | |
179 | if (fstat(fd_map, &sb) < 0) { | |
180 | perror(fname); | |
181 | goto out; | |
182 | } | |
183 | if (!S_ISREG(sb.st_mode)) { | |
184 | fprintf(stderr, "not a regular file: %s\n", fname); | |
185 | goto out; | |
186 | } | |
187 | file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, | |
188 | fd_map, 0); | |
189 | if (file_map == MAP_FAILED) { | |
190 | mmap_failed = 1; | |
191 | file_map = umalloc(sb.st_size); | |
192 | if (!file_map) { | |
193 | perror(fname); | |
194 | goto out; | |
195 | } | |
196 | if (read(fd_map, file_map, sb.st_size) != sb.st_size) { | |
197 | perror(fname); | |
198 | free(file_map); | |
199 | file_map = NULL; | |
200 | goto out; | |
201 | } | |
202 | } else | |
203 | mmap_failed = 0; | |
204 | out: | |
205 | close(fd_map); | |
206 | fd_map = -1; | |
207 | ||
208 | file_end = file_map + sb.st_size; | |
209 | ||
210 | return file_map; | |
211 | } | |
212 | ||
213 | ||
214 | static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; | |
215 | static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; | |
216 | static unsigned char *ideal_nop; | |
217 | ||
218 | static char rel_type_nop; | |
219 | ||
220 | static int (*make_nop)(void *map, size_t const offset); | |
221 | ||
222 | static int make_nop_x86(void *map, size_t const offset) | |
223 | { | |
224 | uint32_t *ptr; | |
225 | unsigned char *op; | |
226 | ||
227 | /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ | |
228 | ptr = map + offset; | |
229 | if (*ptr != 0) | |
230 | return -1; | |
231 | ||
232 | op = map + offset - 1; | |
233 | if (*op != 0xe8) | |
234 | return -1; | |
235 | ||
236 | /* convert to nop */ | |
237 | if (ulseek(offset - 1, SEEK_SET) < 0) | |
238 | return -1; | |
239 | if (uwrite(ideal_nop, 5) < 0) | |
240 | return -1; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */ | |
245 | static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */ | |
246 | static unsigned char *ideal_nop4_arm; | |
247 | ||
248 | static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */ | |
249 | static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */ | |
250 | static unsigned char *bl_mcount_arm; | |
251 | ||
252 | static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */ | |
253 | static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */ | |
254 | static unsigned char *push_arm; | |
255 | ||
256 | static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */ | |
257 | static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */ | |
258 | static unsigned char *ideal_nop2_thumb; | |
259 | ||
260 | static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */ | |
261 | static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */ | |
262 | static unsigned char *push_bl_mcount_thumb; | |
263 | ||
264 | static int make_nop_arm(void *map, size_t const offset) | |
265 | { | |
266 | char *ptr; | |
267 | int cnt = 1; | |
268 | int nop_size; | |
269 | size_t off = offset; | |
270 | ||
271 | ptr = map + offset; | |
272 | if (memcmp(ptr, bl_mcount_arm, 4) == 0) { | |
273 | if (memcmp(ptr - 4, push_arm, 4) == 0) { | |
274 | off -= 4; | |
275 | cnt = 2; | |
276 | } | |
277 | ideal_nop = ideal_nop4_arm; | |
278 | nop_size = 4; | |
279 | } else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) { | |
280 | cnt = 3; | |
281 | nop_size = 2; | |
282 | off -= 2; | |
283 | ideal_nop = ideal_nop2_thumb; | |
284 | } else | |
285 | return -1; | |
286 | ||
287 | /* Convert to nop */ | |
288 | if (ulseek(off, SEEK_SET) < 0) | |
289 | return -1; | |
290 | ||
291 | do { | |
292 | if (uwrite(ideal_nop, nop_size) < 0) | |
293 | return -1; | |
294 | } while (--cnt > 0); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5}; | |
300 | static int make_nop_arm64(void *map, size_t const offset) | |
301 | { | |
302 | uint32_t *ptr; | |
303 | ||
304 | ptr = map + offset; | |
305 | /* bl <_mcount> is 0x94000000 before relocation */ | |
306 | if (*ptr != 0x94000000) | |
307 | return -1; | |
308 | ||
309 | /* Convert to nop */ | |
310 | if (ulseek(offset, SEEK_SET) < 0) | |
311 | return -1; | |
312 | if (uwrite(ideal_nop, 4) < 0) | |
313 | return -1; | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int write_file(const char *fname) | |
318 | { | |
319 | char tmp_file[strlen(fname) + 4]; | |
320 | size_t n; | |
321 | ||
322 | if (!file_updated) | |
323 | return 0; | |
324 | ||
325 | sprintf(tmp_file, "%s.rc", fname); | |
326 | ||
327 | /* | |
328 | * After reading the entire file into memory, delete it | |
329 | * and write it back, to prevent weird side effects of modifying | |
330 | * an object file in place. | |
331 | */ | |
332 | fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode); | |
333 | if (fd_map < 0) { | |
334 | perror(fname); | |
335 | return -1; | |
336 | } | |
337 | n = write(fd_map, file_map, sb.st_size); | |
338 | if (n != sb.st_size) { | |
339 | perror("write"); | |
340 | close(fd_map); | |
341 | return -1; | |
342 | } | |
343 | if (file_append_size) { | |
344 | n = write(fd_map, file_append, file_append_size); | |
345 | if (n != file_append_size) { | |
346 | perror("write"); | |
347 | close(fd_map); | |
348 | return -1; | |
349 | } | |
350 | } | |
351 | close(fd_map); | |
352 | if (rename(tmp_file, fname) < 0) { | |
353 | perror(fname); | |
354 | return -1; | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /* w8rev, w8nat, ...: Handle endianness. */ | |
360 | ||
361 | static uint64_t w8rev(uint64_t const x) | |
362 | { | |
363 | return ((0xff & (x >> (0 * 8))) << (7 * 8)) | |
364 | | ((0xff & (x >> (1 * 8))) << (6 * 8)) | |
365 | | ((0xff & (x >> (2 * 8))) << (5 * 8)) | |
366 | | ((0xff & (x >> (3 * 8))) << (4 * 8)) | |
367 | | ((0xff & (x >> (4 * 8))) << (3 * 8)) | |
368 | | ((0xff & (x >> (5 * 8))) << (2 * 8)) | |
369 | | ((0xff & (x >> (6 * 8))) << (1 * 8)) | |
370 | | ((0xff & (x >> (7 * 8))) << (0 * 8)); | |
371 | } | |
372 | ||
373 | static uint32_t w4rev(uint32_t const x) | |
374 | { | |
375 | return ((0xff & (x >> (0 * 8))) << (3 * 8)) | |
376 | | ((0xff & (x >> (1 * 8))) << (2 * 8)) | |
377 | | ((0xff & (x >> (2 * 8))) << (1 * 8)) | |
378 | | ((0xff & (x >> (3 * 8))) << (0 * 8)); | |
379 | } | |
380 | ||
381 | static uint32_t w2rev(uint16_t const x) | |
382 | { | |
383 | return ((0xff & (x >> (0 * 8))) << (1 * 8)) | |
384 | | ((0xff & (x >> (1 * 8))) << (0 * 8)); | |
385 | } | |
386 | ||
387 | static uint64_t w8nat(uint64_t const x) | |
388 | { | |
389 | return x; | |
390 | } | |
391 | ||
392 | static uint32_t w4nat(uint32_t const x) | |
393 | { | |
394 | return x; | |
395 | } | |
396 | ||
397 | static uint32_t w2nat(uint16_t const x) | |
398 | { | |
399 | return x; | |
400 | } | |
401 | ||
402 | static uint64_t (*w8)(uint64_t); | |
403 | static uint32_t (*w)(uint32_t); | |
404 | static uint32_t (*w2)(uint16_t); | |
405 | ||
406 | /* Names of the sections that could contain calls to mcount. */ | |
407 | static int is_mcounted_section_name(char const *const txtname) | |
408 | { | |
409 | return strncmp(".text", txtname, 5) == 0 || | |
410 | strcmp(".init.text", txtname) == 0 || | |
411 | strcmp(".ref.text", txtname) == 0 || | |
412 | strcmp(".sched.text", txtname) == 0 || | |
413 | strcmp(".spinlock.text", txtname) == 0 || | |
414 | strcmp(".irqentry.text", txtname) == 0 || | |
415 | strcmp(".softirqentry.text", txtname) == 0 || | |
416 | strcmp(".kprobes.text", txtname) == 0 || | |
417 | strcmp(".cpuidle.text", txtname) == 0; | |
418 | } | |
419 | ||
420 | static char const *already_has_rel_mcount = "success"; /* our work here is done! */ | |
421 | ||
422 | /* 32 bit and 64 bit are very similar */ | |
423 | #include "recordmcount.h" | |
424 | #define RECORD_MCOUNT_64 | |
425 | #include "recordmcount.h" | |
426 | ||
427 | static int arm_is_fake_mcount(Elf32_Rel const *rp) | |
428 | { | |
429 | switch (ELF32_R_TYPE(w(rp->r_info))) { | |
430 | case R_ARM_THM_CALL: | |
431 | case R_ARM_CALL: | |
432 | case R_ARM_PC24: | |
433 | return 0; | |
434 | } | |
435 | ||
436 | return 1; | |
437 | } | |
438 | ||
439 | static int arm64_is_fake_mcount(Elf64_Rel const *rp) | |
440 | { | |
441 | return ELF64_R_TYPE(w(rp->r_info)) != R_AARCH64_CALL26; | |
442 | } | |
443 | ||
444 | /* 64-bit EM_MIPS has weird ELF64_Rela.r_info. | |
445 | * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf | |
446 | * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] | |
447 | * to imply the order of the members; the spec does not say so. | |
448 | * typedef unsigned char Elf64_Byte; | |
449 | * fails on MIPS64 because their <elf.h> already has it! | |
450 | */ | |
451 | ||
452 | typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ | |
453 | ||
454 | union mips_r_info { | |
455 | Elf64_Xword r_info; | |
456 | struct { | |
457 | Elf64_Word r_sym; /* Symbol index. */ | |
458 | myElf64_Byte r_ssym; /* Special symbol. */ | |
459 | myElf64_Byte r_type3; /* Third relocation. */ | |
460 | myElf64_Byte r_type2; /* Second relocation. */ | |
461 | myElf64_Byte r_type; /* First relocation. */ | |
462 | } r_mips; | |
463 | }; | |
464 | ||
465 | static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) | |
466 | { | |
467 | return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); | |
468 | } | |
469 | ||
470 | static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) | |
471 | { | |
472 | rp->r_info = ((union mips_r_info){ | |
473 | .r_mips = { .r_sym = w(sym), .r_type = type } | |
474 | }).r_info; | |
475 | } | |
476 | ||
477 | static int do_file(char const *const fname) | |
478 | { | |
479 | unsigned int reltype = 0; | |
480 | Elf32_Ehdr *ehdr; | |
481 | int rc = -1; | |
482 | ||
483 | ehdr = mmap_file(fname); | |
484 | if (!ehdr) | |
485 | goto out; | |
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 | goto out; | |
496 | case ELFDATA2LSB: | |
497 | if (*(unsigned char const *)&endian != 1) { | |
498 | /* main() is big endian, file.o is little endian. */ | |
499 | w = w4rev; | |
500 | w2 = w2rev; | |
501 | w8 = w8rev; | |
502 | } | |
503 | ideal_nop4_arm = ideal_nop4_arm_le; | |
504 | bl_mcount_arm = bl_mcount_arm_le; | |
505 | push_arm = push_arm_le; | |
506 | ideal_nop2_thumb = ideal_nop2_thumb_le; | |
507 | push_bl_mcount_thumb = push_bl_mcount_thumb_le; | |
508 | break; | |
509 | case ELFDATA2MSB: | |
510 | if (*(unsigned char const *)&endian != 0) { | |
511 | /* main() is little endian, file.o is big endian. */ | |
512 | w = w4rev; | |
513 | w2 = w2rev; | |
514 | w8 = w8rev; | |
515 | } | |
516 | ideal_nop4_arm = ideal_nop4_arm_be; | |
517 | bl_mcount_arm = bl_mcount_arm_be; | |
518 | push_arm = push_arm_be; | |
519 | ideal_nop2_thumb = ideal_nop2_thumb_be; | |
520 | push_bl_mcount_thumb = push_bl_mcount_thumb_be; | |
521 | break; | |
522 | } /* end switch */ | |
523 | if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 || | |
524 | w2(ehdr->e_type) != ET_REL || | |
525 | ehdr->e_ident[EI_VERSION] != EV_CURRENT) { | |
526 | fprintf(stderr, "unrecognized ET_REL file %s\n", fname); | |
527 | goto out; | |
528 | } | |
529 | ||
530 | gpfx = '_'; | |
531 | switch (w2(ehdr->e_machine)) { | |
532 | default: | |
533 | fprintf(stderr, "unrecognized e_machine %u %s\n", | |
534 | w2(ehdr->e_machine), fname); | |
535 | goto out; | |
536 | case EM_386: | |
537 | reltype = R_386_32; | |
538 | rel_type_nop = R_386_NONE; | |
539 | make_nop = make_nop_x86; | |
540 | ideal_nop = ideal_nop5_x86_32; | |
541 | mcount_adjust_32 = -1; | |
542 | gpfx = 0; | |
543 | break; | |
544 | case EM_ARM: | |
545 | 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 | gpfx = 0; | |
551 | break; | |
552 | case EM_AARCH64: | |
553 | reltype = R_AARCH64_ABS64; | |
554 | make_nop = make_nop_arm64; | |
555 | rel_type_nop = R_AARCH64_NONE; | |
556 | ideal_nop = ideal_nop4_arm64; | |
557 | is_fake_mcount64 = arm64_is_fake_mcount; | |
558 | break; | |
559 | case EM_IA_64: reltype = R_IA64_IMM64; break; | |
560 | case EM_MIPS: /* reltype: e_class */ break; | |
561 | case EM_PPC: reltype = R_PPC_ADDR32; break; | |
562 | case EM_PPC64: reltype = R_PPC64_ADDR64; break; | |
563 | case EM_S390: /* reltype: e_class */ break; | |
564 | case EM_SH: reltype = R_SH_DIR32; gpfx = 0; break; | |
565 | case EM_SPARCV9: reltype = R_SPARC_64; break; | |
566 | case EM_X86_64: | |
567 | make_nop = make_nop_x86; | |
568 | ideal_nop = ideal_nop5_x86_64; | |
569 | reltype = R_X86_64_64; | |
570 | rel_type_nop = R_X86_64_NONE; | |
571 | mcount_adjust_64 = -1; | |
572 | gpfx = 0; | |
573 | break; | |
574 | } /* end switch */ | |
575 | ||
576 | switch (ehdr->e_ident[EI_CLASS]) { | |
577 | default: | |
578 | fprintf(stderr, "unrecognized ELF class %d %s\n", | |
579 | ehdr->e_ident[EI_CLASS], fname); | |
580 | goto out; | |
581 | case ELFCLASS32: | |
582 | if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) | |
583 | || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { | |
584 | fprintf(stderr, | |
585 | "unrecognized ET_REL file: %s\n", fname); | |
586 | goto out; | |
587 | } | |
588 | if (w2(ehdr->e_machine) == EM_MIPS) { | |
589 | reltype = R_MIPS_32; | |
590 | is_fake_mcount32 = MIPS32_is_fake_mcount; | |
591 | } | |
592 | if (do32(ehdr, fname, reltype) < 0) | |
593 | goto out; | |
594 | break; | |
595 | case ELFCLASS64: { | |
596 | Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; | |
597 | if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) | |
598 | || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { | |
599 | fprintf(stderr, | |
600 | "unrecognized ET_REL file: %s\n", fname); | |
601 | goto out; | |
602 | } | |
603 | if (w2(ghdr->e_machine) == EM_S390) { | |
604 | reltype = R_390_64; | |
605 | mcount_adjust_64 = -14; | |
606 | } | |
607 | if (w2(ghdr->e_machine) == EM_MIPS) { | |
608 | reltype = R_MIPS_64; | |
609 | Elf64_r_sym = MIPS64_r_sym; | |
610 | Elf64_r_info = MIPS64_r_info; | |
611 | is_fake_mcount64 = MIPS64_is_fake_mcount; | |
612 | } | |
613 | if (do64(ghdr, fname, reltype) < 0) | |
614 | goto out; | |
615 | break; | |
616 | } | |
617 | } /* end switch */ | |
618 | ||
619 | rc = write_file(fname); | |
620 | out: | |
621 | file_append_cleanup(); | |
622 | mmap_cleanup(); | |
623 | return rc; | |
624 | } | |
625 | ||
626 | int main(int argc, char *argv[]) | |
627 | { | |
628 | const char ftrace[] = "/ftrace.o"; | |
629 | int ftrace_size = sizeof(ftrace) - 1; | |
630 | int n_error = 0; /* gcc-4.3.0 false positive complaint */ | |
631 | int c; | |
632 | int i; | |
633 | ||
634 | while ((c = getopt(argc, argv, "w")) >= 0) { | |
635 | switch (c) { | |
636 | case 'w': | |
637 | warn_on_notrace_sect = 1; | |
638 | break; | |
639 | default: | |
640 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
641 | return 0; | |
642 | } | |
643 | } | |
644 | ||
645 | if ((argc - optind) < 1) { | |
646 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
647 | return 0; | |
648 | } | |
649 | ||
650 | /* Process each file in turn, allowing deep failure. */ | |
651 | for (i = optind; i < argc; i++) { | |
652 | char *file = argv[i]; | |
653 | int len; | |
654 | ||
655 | /* | |
656 | * The file kernel/trace/ftrace.o references the mcount | |
657 | * function but does not call it. Since ftrace.o should | |
658 | * not be traced anyway, we just skip it. | |
659 | */ | |
660 | len = strlen(file); | |
661 | if (len >= ftrace_size && | |
662 | strcmp(file + (len - ftrace_size), ftrace) == 0) | |
663 | continue; | |
664 | ||
665 | if (do_file(file)) { | |
666 | fprintf(stderr, "%s: failed\n", file); | |
667 | ++n_error; | |
668 | } | |
669 | } | |
670 | return !!n_error; | |
671 | } |