Commit | Line | Data |
---|---|---|
4317cf95 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
81d3858d JR |
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. | |
81d3858d JR |
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> | |
dfad3d59 | 27 | #include <getopt.h> |
81d3858d JR |
28 | #include <elf.h> |
29 | #include <fcntl.h> | |
81d3858d JR |
30 | #include <stdio.h> |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | #include <unistd.h> | |
34 | ||
af64d2aa AT |
35 | #ifndef EM_AARCH64 |
36 | #define EM_AARCH64 183 | |
2ee8a74f | 37 | #define R_AARCH64_NONE 0 |
af64d2aa AT |
38 | #define R_AARCH64_ABS64 257 |
39 | #endif | |
40 | ||
927d780e AS |
41 | #define R_ARM_PC24 1 |
42 | #define R_ARM_THM_CALL 10 | |
43 | #define R_ARM_CALL 28 | |
44 | ||
81d3858d JR |
45 | static int fd_map; /* File descriptor for file being modified. */ |
46 | static int mmap_failed; /* Boolean flag. */ | |
81d3858d JR |
47 | static char gpfx; /* prefix for global symbol name (sometimes '_') */ |
48 | static struct stat sb; /* Remember .st_size, etc. */ | |
ed60453f | 49 | static const char *altmcount; /* alternate mcount symbol name */ |
dfad3d59 | 50 | static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */ |
a50bd439 SRRH |
51 | static void *file_map; /* pointer of the mapped file */ |
52 | static void *file_end; /* pointer to the end of the mapped file */ | |
53 | static int file_updated; /* flag to state file was changed */ | |
54 | static void *file_ptr; /* current file pointer location */ | |
4fbcf074 | 55 | |
a50bd439 SRRH |
56 | static void *file_append; /* added to the end of the file */ |
57 | static size_t file_append_size; /* how much is added to end of file */ | |
81d3858d | 58 | |
81d3858d | 59 | /* Per-file resource cleanup when multiple files. */ |
4fbcf074 MH |
60 | static void file_append_cleanup(void) |
61 | { | |
62 | free(file_append); | |
63 | file_append = NULL; | |
64 | file_append_size = 0; | |
65 | file_updated = 0; | |
66 | } | |
67 | ||
68 | static void mmap_cleanup(void) | |
81d3858d JR |
69 | { |
70 | if (!mmap_failed) | |
a50bd439 | 71 | munmap(file_map, sb.st_size); |
81d3858d | 72 | else |
a50bd439 SRRH |
73 | free(file_map); |
74 | file_map = NULL; | |
81d3858d JR |
75 | } |
76 | ||
a1462079 | 77 | /* ulseek, uwrite, ...: Check return value for errors. */ |
81d3858d | 78 | |
3aec8638 | 79 | static off_t ulseek(off_t const offset, int const whence) |
81d3858d | 80 | { |
a50bd439 SRRH |
81 | switch (whence) { |
82 | case SEEK_SET: | |
83 | file_ptr = file_map + offset; | |
84 | break; | |
85 | case SEEK_CUR: | |
86 | file_ptr += offset; | |
87 | break; | |
88 | case SEEK_END: | |
89 | file_ptr = file_map + (sb.st_size - offset); | |
90 | break; | |
91 | } | |
92 | if (file_ptr < file_map) { | |
93 | fprintf(stderr, "lseek: seek before file\n"); | |
3f1df120 | 94 | return -1; |
81d3858d | 95 | } |
a50bd439 | 96 | return file_ptr - file_map; |
81d3858d JR |
97 | } |
98 | ||
3aec8638 | 99 | static ssize_t uwrite(void const *const buf, size_t const count) |
81d3858d | 100 | { |
a50bd439 SRRH |
101 | size_t cnt = count; |
102 | off_t idx = 0; | |
103 | ||
104 | file_updated = 1; | |
105 | ||
106 | if (file_ptr + count >= file_end) { | |
107 | off_t aoffset = (file_ptr + count) - file_end; | |
108 | ||
109 | if (aoffset > file_append_size) { | |
110 | file_append = realloc(file_append, aoffset); | |
111 | file_append_size = aoffset; | |
112 | } | |
113 | if (!file_append) { | |
114 | perror("write"); | |
4fbcf074 MH |
115 | file_append_cleanup(); |
116 | mmap_cleanup(); | |
3f1df120 | 117 | return -1; |
a50bd439 SRRH |
118 | } |
119 | if (file_ptr < file_end) { | |
120 | cnt = file_end - file_ptr; | |
121 | } else { | |
122 | cnt = 0; | |
123 | idx = aoffset - count; | |
124 | } | |
81d3858d | 125 | } |
a50bd439 SRRH |
126 | |
127 | if (cnt) | |
128 | memcpy(file_ptr, buf, cnt); | |
129 | ||
130 | if (cnt < count) | |
131 | memcpy(file_append + idx, buf + cnt, count - cnt); | |
132 | ||
133 | file_ptr += count; | |
134 | return count; | |
81d3858d JR |
135 | } |
136 | ||
3aec8638 | 137 | static void * umalloc(size_t size) |
81d3858d JR |
138 | { |
139 | void *const addr = malloc(size); | |
dd5477ff | 140 | if (addr == 0) { |
81d3858d | 141 | fprintf(stderr, "malloc failed: %zu bytes\n", size); |
4fbcf074 MH |
142 | file_append_cleanup(); |
143 | mmap_cleanup(); | |
3f1df120 | 144 | return NULL; |
81d3858d JR |
145 | } |
146 | return addr; | |
147 | } | |
148 | ||
4fbcf074 MH |
149 | /* |
150 | * Get the whole file as a programming convenience in order to avoid | |
151 | * malloc+lseek+read+free of many pieces. If successful, then mmap | |
152 | * avoids copying unused pieces; else just read the whole file. | |
153 | * Open for both read and write; new info will be appended to the file. | |
154 | * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr | |
155 | * do not propagate to the file until an explicit overwrite at the last. | |
156 | * This preserves most aspects of consistency (all except .st_size) | |
157 | * for simultaneous readers of the file while we are appending to it. | |
158 | * However, multiple writers still are bad. We choose not to use | |
159 | * locking because it is expensive and the use case of kernel build | |
160 | * makes multiple writers unlikely. | |
161 | */ | |
162 | static void *mmap_file(char const *fname) | |
163 | { | |
164 | /* Avoid problems if early cleanup() */ | |
165 | fd_map = -1; | |
166 | mmap_failed = 1; | |
167 | file_map = NULL; | |
168 | file_ptr = NULL; | |
169 | file_updated = 0; | |
170 | sb.st_size = 0; | |
171 | ||
172 | fd_map = open(fname, O_RDONLY); | |
173 | if (fd_map < 0) { | |
174 | perror(fname); | |
175 | return NULL; | |
176 | } | |
177 | if (fstat(fd_map, &sb) < 0) { | |
178 | perror(fname); | |
179 | goto out; | |
180 | } | |
181 | if (!S_ISREG(sb.st_mode)) { | |
182 | fprintf(stderr, "not a regular file: %s\n", fname); | |
183 | goto out; | |
184 | } | |
185 | file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, | |
186 | fd_map, 0); | |
187 | if (file_map == MAP_FAILED) { | |
188 | mmap_failed = 1; | |
189 | file_map = umalloc(sb.st_size); | |
190 | if (!file_map) { | |
191 | perror(fname); | |
192 | goto out; | |
193 | } | |
194 | if (read(fd_map, file_map, sb.st_size) != sb.st_size) { | |
195 | perror(fname); | |
196 | free(file_map); | |
197 | file_map = NULL; | |
198 | goto out; | |
199 | } | |
200 | } else | |
201 | mmap_failed = 0; | |
202 | out: | |
203 | close(fd_map); | |
204 | fd_map = -1; | |
205 | ||
206 | file_end = file_map + sb.st_size; | |
207 | ||
208 | return file_map; | |
209 | } | |
210 | ||
211 | ||
ffd618fa SR |
212 | static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
213 | static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; | |
214 | static unsigned char *ideal_nop; | |
215 | ||
216 | static char rel_type_nop; | |
217 | ||
218 | static int (*make_nop)(void *map, size_t const offset); | |
219 | ||
220 | static int make_nop_x86(void *map, size_t const offset) | |
221 | { | |
222 | uint32_t *ptr; | |
223 | unsigned char *op; | |
224 | ||
225 | /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ | |
226 | ptr = map + offset; | |
227 | if (*ptr != 0) | |
228 | return -1; | |
229 | ||
230 | op = map + offset - 1; | |
231 | if (*op != 0xe8) | |
232 | return -1; | |
233 | ||
234 | /* convert to nop */ | |
3f1df120 MH |
235 | if (ulseek(offset - 1, SEEK_SET) < 0) |
236 | return -1; | |
237 | if (uwrite(ideal_nop, 5) < 0) | |
238 | return -1; | |
ffd618fa SR |
239 | return 0; |
240 | } | |
241 | ||
9648dc15 SB |
242 | static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */ |
243 | static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */ | |
244 | static unsigned char *ideal_nop4_arm; | |
245 | ||
246 | static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */ | |
247 | static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */ | |
248 | static unsigned char *bl_mcount_arm; | |
249 | ||
250 | static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */ | |
251 | static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */ | |
252 | static unsigned char *push_arm; | |
253 | ||
254 | static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */ | |
255 | static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */ | |
256 | static unsigned char *ideal_nop2_thumb; | |
257 | ||
258 | static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */ | |
259 | static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */ | |
260 | static unsigned char *push_bl_mcount_thumb; | |
261 | ||
262 | static int make_nop_arm(void *map, size_t const offset) | |
263 | { | |
264 | char *ptr; | |
265 | int cnt = 1; | |
266 | int nop_size; | |
267 | size_t off = offset; | |
268 | ||
269 | ptr = map + offset; | |
270 | if (memcmp(ptr, bl_mcount_arm, 4) == 0) { | |
271 | if (memcmp(ptr - 4, push_arm, 4) == 0) { | |
272 | off -= 4; | |
273 | cnt = 2; | |
274 | } | |
275 | ideal_nop = ideal_nop4_arm; | |
276 | nop_size = 4; | |
277 | } else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) { | |
278 | cnt = 3; | |
279 | nop_size = 2; | |
280 | off -= 2; | |
281 | ideal_nop = ideal_nop2_thumb; | |
282 | } else | |
283 | return -1; | |
284 | ||
285 | /* Convert to nop */ | |
3f1df120 MH |
286 | if (ulseek(off, SEEK_SET) < 0) |
287 | return -1; | |
9648dc15 SB |
288 | |
289 | do { | |
3f1df120 MH |
290 | if (uwrite(ideal_nop, nop_size) < 0) |
291 | return -1; | |
9648dc15 SB |
292 | } while (--cnt > 0); |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
2ee8a74f LB |
297 | static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5}; |
298 | static int make_nop_arm64(void *map, size_t const offset) | |
299 | { | |
300 | uint32_t *ptr; | |
301 | ||
302 | ptr = map + offset; | |
303 | /* bl <_mcount> is 0x94000000 before relocation */ | |
304 | if (*ptr != 0x94000000) | |
305 | return -1; | |
306 | ||
307 | /* Convert to nop */ | |
3f1df120 MH |
308 | if (ulseek(offset, SEEK_SET) < 0) |
309 | return -1; | |
310 | if (uwrite(ideal_nop, 4) < 0) | |
311 | return -1; | |
2ee8a74f LB |
312 | return 0; |
313 | } | |
314 | ||
3f1df120 | 315 | static int write_file(const char *fname) |
a50bd439 SRRH |
316 | { |
317 | char tmp_file[strlen(fname) + 4]; | |
318 | size_t n; | |
319 | ||
320 | if (!file_updated) | |
3f1df120 | 321 | return 0; |
a50bd439 SRRH |
322 | |
323 | sprintf(tmp_file, "%s.rc", fname); | |
324 | ||
325 | /* | |
326 | * After reading the entire file into memory, delete it | |
327 | * and write it back, to prevent weird side effects of modifying | |
328 | * an object file in place. | |
329 | */ | |
330 | fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode); | |
331 | if (fd_map < 0) { | |
332 | perror(fname); | |
3f1df120 | 333 | return -1; |
a50bd439 SRRH |
334 | } |
335 | n = write(fd_map, file_map, sb.st_size); | |
336 | if (n != sb.st_size) { | |
337 | perror("write"); | |
3f1df120 MH |
338 | close(fd_map); |
339 | return -1; | |
a50bd439 SRRH |
340 | } |
341 | if (file_append_size) { | |
342 | n = write(fd_map, file_append, file_append_size); | |
343 | if (n != file_append_size) { | |
344 | perror("write"); | |
3f1df120 MH |
345 | close(fd_map); |
346 | return -1; | |
dd39a265 | 347 | } |
dd39a265 | 348 | } |
a50bd439 SRRH |
349 | close(fd_map); |
350 | if (rename(tmp_file, fname) < 0) { | |
351 | perror(fname); | |
3f1df120 | 352 | return -1; |
a50bd439 | 353 | } |
3f1df120 | 354 | return 0; |
81d3858d JR |
355 | } |
356 | ||
357 | /* w8rev, w8nat, ...: Handle endianness. */ | |
358 | ||
359 | static uint64_t w8rev(uint64_t const x) | |
360 | { | |
361 | return ((0xff & (x >> (0 * 8))) << (7 * 8)) | |
362 | | ((0xff & (x >> (1 * 8))) << (6 * 8)) | |
363 | | ((0xff & (x >> (2 * 8))) << (5 * 8)) | |
364 | | ((0xff & (x >> (3 * 8))) << (4 * 8)) | |
365 | | ((0xff & (x >> (4 * 8))) << (3 * 8)) | |
366 | | ((0xff & (x >> (5 * 8))) << (2 * 8)) | |
367 | | ((0xff & (x >> (6 * 8))) << (1 * 8)) | |
368 | | ((0xff & (x >> (7 * 8))) << (0 * 8)); | |
369 | } | |
370 | ||
371 | static uint32_t w4rev(uint32_t const x) | |
372 | { | |
373 | return ((0xff & (x >> (0 * 8))) << (3 * 8)) | |
374 | | ((0xff & (x >> (1 * 8))) << (2 * 8)) | |
375 | | ((0xff & (x >> (2 * 8))) << (1 * 8)) | |
376 | | ((0xff & (x >> (3 * 8))) << (0 * 8)); | |
377 | } | |
378 | ||
379 | static uint32_t w2rev(uint16_t const x) | |
380 | { | |
381 | return ((0xff & (x >> (0 * 8))) << (1 * 8)) | |
382 | | ((0xff & (x >> (1 * 8))) << (0 * 8)); | |
383 | } | |
384 | ||
385 | static uint64_t w8nat(uint64_t const x) | |
386 | { | |
387 | return x; | |
388 | } | |
389 | ||
390 | static uint32_t w4nat(uint32_t const x) | |
391 | { | |
392 | return x; | |
393 | } | |
394 | ||
395 | static uint32_t w2nat(uint16_t const x) | |
396 | { | |
397 | return x; | |
398 | } | |
399 | ||
400 | static uint64_t (*w8)(uint64_t); | |
401 | static uint32_t (*w)(uint32_t); | |
402 | static uint32_t (*w2)(uint16_t); | |
403 | ||
404 | /* Names of the sections that could contain calls to mcount. */ | |
3aec8638 | 405 | static int is_mcounted_section_name(char const *const txtname) |
81d3858d | 406 | { |
9c8e2f6d | 407 | return strncmp(".text", txtname, 5) == 0 || |
42c269c8 | 408 | strcmp(".init.text", txtname) == 0 || |
dd5477ff SR |
409 | strcmp(".ref.text", txtname) == 0 || |
410 | strcmp(".sched.text", txtname) == 0 || | |
411 | strcmp(".spinlock.text", txtname) == 0 || | |
412 | strcmp(".irqentry.text", txtname) == 0 || | |
e436fd61 | 413 | strcmp(".softirqentry.text", txtname) == 0 || |
9f087e76 | 414 | strcmp(".kprobes.text", txtname) == 0 || |
1bd95be2 | 415 | strcmp(".cpuidle.text", txtname) == 0; |
81d3858d JR |
416 | } |
417 | ||
3f1df120 MH |
418 | static char const *already_has_rel_mcount = "success"; /* our work here is done! */ |
419 | ||
c28d5077 SR |
420 | /* 32 bit and 64 bit are very similar */ |
421 | #include "recordmcount.h" | |
422 | #define RECORD_MCOUNT_64 | |
423 | #include "recordmcount.h" | |
81d3858d | 424 | |
927d780e AS |
425 | static int arm_is_fake_mcount(Elf32_Rel const *rp) |
426 | { | |
427 | switch (ELF32_R_TYPE(w(rp->r_info))) { | |
428 | case R_ARM_THM_CALL: | |
429 | case R_ARM_CALL: | |
430 | case R_ARM_PC24: | |
431 | return 0; | |
432 | } | |
433 | ||
434 | return 1; | |
435 | } | |
436 | ||
a2d49358 JR |
437 | /* 64-bit EM_MIPS has weird ELF64_Rela.r_info. |
438 | * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf | |
439 | * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] | |
440 | * to imply the order of the members; the spec does not say so. | |
441 | * typedef unsigned char Elf64_Byte; | |
442 | * fails on MIPS64 because their <elf.h> already has it! | |
443 | */ | |
444 | ||
445 | typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ | |
446 | ||
447 | union mips_r_info { | |
448 | Elf64_Xword r_info; | |
449 | struct { | |
450 | Elf64_Word r_sym; /* Symbol index. */ | |
451 | myElf64_Byte r_ssym; /* Special symbol. */ | |
452 | myElf64_Byte r_type3; /* Third relocation. */ | |
453 | myElf64_Byte r_type2; /* Second relocation. */ | |
454 | myElf64_Byte r_type; /* First relocation. */ | |
455 | } r_mips; | |
456 | }; | |
457 | ||
458 | static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) | |
459 | { | |
460 | return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); | |
461 | } | |
462 | ||
463 | static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) | |
464 | { | |
465 | rp->r_info = ((union mips_r_info){ | |
466 | .r_mips = { .r_sym = w(sym), .r_type = type } | |
467 | }).r_info; | |
468 | } | |
469 | ||
3aec8638 | 470 | static int do_file(char const *const fname) |
81d3858d | 471 | { |
81d3858d | 472 | unsigned int reltype = 0; |
4fbcf074 | 473 | Elf32_Ehdr *ehdr; |
3f1df120 MH |
474 | int rc = -1; |
475 | ||
4fbcf074 | 476 | ehdr = mmap_file(fname); |
3f1df120 MH |
477 | if (!ehdr) |
478 | goto out; | |
81d3858d | 479 | |
81d3858d JR |
480 | w = w4nat; |
481 | w2 = w2nat; | |
482 | w8 = w8nat; | |
483 | switch (ehdr->e_ident[EI_DATA]) { | |
484 | static unsigned int const endian = 1; | |
e90b0c8b | 485 | default: |
81d3858d JR |
486 | fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", |
487 | ehdr->e_ident[EI_DATA], fname); | |
3f1df120 | 488 | goto out; |
e90b0c8b | 489 | case ELFDATA2LSB: |
dd5477ff | 490 | if (*(unsigned char const *)&endian != 1) { |
81d3858d JR |
491 | /* main() is big endian, file.o is little endian. */ |
492 | w = w4rev; | |
493 | w2 = w2rev; | |
494 | w8 = w8rev; | |
495 | } | |
9648dc15 SB |
496 | ideal_nop4_arm = ideal_nop4_arm_le; |
497 | bl_mcount_arm = bl_mcount_arm_le; | |
498 | push_arm = push_arm_le; | |
499 | ideal_nop2_thumb = ideal_nop2_thumb_le; | |
500 | push_bl_mcount_thumb = push_bl_mcount_thumb_le; | |
e90b0c8b SR |
501 | break; |
502 | case ELFDATA2MSB: | |
dd5477ff | 503 | if (*(unsigned char const *)&endian != 0) { |
81d3858d JR |
504 | /* main() is little endian, file.o is big endian. */ |
505 | w = w4rev; | |
506 | w2 = w2rev; | |
507 | w8 = w8rev; | |
508 | } | |
9648dc15 SB |
509 | ideal_nop4_arm = ideal_nop4_arm_be; |
510 | bl_mcount_arm = bl_mcount_arm_be; | |
511 | push_arm = push_arm_be; | |
512 | ideal_nop2_thumb = ideal_nop2_thumb_be; | |
513 | push_bl_mcount_thumb = push_bl_mcount_thumb_be; | |
e90b0c8b | 514 | break; |
81d3858d | 515 | } /* end switch */ |
2e63152b MH |
516 | if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 || |
517 | w2(ehdr->e_type) != ET_REL || | |
518 | ehdr->e_ident[EI_VERSION] != EV_CURRENT) { | |
81d3858d | 519 | fprintf(stderr, "unrecognized ET_REL file %s\n", fname); |
3f1df120 | 520 | goto out; |
81d3858d JR |
521 | } |
522 | ||
2e63152b | 523 | gpfx = '_'; |
81d3858d | 524 | switch (w2(ehdr->e_machine)) { |
e90b0c8b | 525 | default: |
ac5db1fc | 526 | fprintf(stderr, "unrecognized e_machine %u %s\n", |
81d3858d | 527 | w2(ehdr->e_machine), fname); |
3f1df120 | 528 | goto out; |
ffd618fa SR |
529 | case EM_386: |
530 | reltype = R_386_32; | |
46a2b61e | 531 | rel_type_nop = R_386_NONE; |
ffd618fa SR |
532 | make_nop = make_nop_x86; |
533 | ideal_nop = ideal_nop5_x86_32; | |
521ccb5c | 534 | mcount_adjust_32 = -1; |
2e63152b MH |
535 | gpfx = 0; |
536 | break; | |
537 | case EM_ARM: | |
538 | reltype = R_ARM_ABS32; | |
539 | altmcount = "__gnu_mcount_nc"; | |
540 | make_nop = make_nop_arm; | |
541 | rel_type_nop = R_ARM_NONE; | |
927d780e | 542 | is_fake_mcount32 = arm_is_fake_mcount; |
2e63152b | 543 | gpfx = 0; |
ffd618fa | 544 | break; |
af64d2aa | 545 | case EM_AARCH64: |
2e63152b MH |
546 | reltype = R_AARCH64_ABS64; |
547 | make_nop = make_nop_arm64; | |
548 | rel_type_nop = R_AARCH64_NONE; | |
549 | ideal_nop = ideal_nop4_arm64; | |
550 | break; | |
551 | case EM_IA_64: reltype = R_IA64_IMM64; break; | |
552 | case EM_MIPS: /* reltype: e_class */ break; | |
553 | case EM_PPC: reltype = R_PPC_ADDR32; break; | |
554 | case EM_PPC64: reltype = R_PPC64_ADDR64; break; | |
555 | case EM_S390: /* reltype: e_class */ break; | |
556 | case EM_SH: reltype = R_SH_DIR32; gpfx = 0; break; | |
557 | case EM_SPARCV9: reltype = R_SPARC_64; break; | |
ffd618fa SR |
558 | case EM_X86_64: |
559 | make_nop = make_nop_x86; | |
560 | ideal_nop = ideal_nop5_x86_64; | |
561 | reltype = R_X86_64_64; | |
46a2b61e | 562 | rel_type_nop = R_X86_64_NONE; |
521ccb5c | 563 | mcount_adjust_64 = -1; |
2e63152b | 564 | gpfx = 0; |
ffd618fa | 565 | break; |
81d3858d JR |
566 | } /* end switch */ |
567 | ||
568 | switch (ehdr->e_ident[EI_CLASS]) { | |
e90b0c8b | 569 | default: |
81d3858d JR |
570 | fprintf(stderr, "unrecognized ELF class %d %s\n", |
571 | ehdr->e_ident[EI_CLASS], fname); | |
3f1df120 | 572 | goto out; |
e90b0c8b | 573 | case ELFCLASS32: |
dd5477ff SR |
574 | if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) |
575 | || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { | |
81d3858d JR |
576 | fprintf(stderr, |
577 | "unrecognized ET_REL file: %s\n", fname); | |
3f1df120 | 578 | goto out; |
81d3858d | 579 | } |
dd5477ff | 580 | if (w2(ehdr->e_machine) == EM_MIPS) { |
a2d49358 | 581 | reltype = R_MIPS_32; |
412910cd WZ |
582 | is_fake_mcount32 = MIPS32_is_fake_mcount; |
583 | } | |
3f1df120 MH |
584 | if (do32(ehdr, fname, reltype) < 0) |
585 | goto out; | |
e90b0c8b | 586 | break; |
81d3858d JR |
587 | case ELFCLASS64: { |
588 | Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; | |
dd5477ff SR |
589 | if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) |
590 | || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { | |
81d3858d JR |
591 | fprintf(stderr, |
592 | "unrecognized ET_REL file: %s\n", fname); | |
3f1df120 | 593 | goto out; |
81d3858d | 594 | } |
f2963886 | 595 | if (w2(ghdr->e_machine) == EM_S390) { |
81d3858d | 596 | reltype = R_390_64; |
c933146a | 597 | mcount_adjust_64 = -14; |
f2963886 | 598 | } |
dd5477ff | 599 | if (w2(ghdr->e_machine) == EM_MIPS) { |
a2d49358 JR |
600 | reltype = R_MIPS_64; |
601 | Elf64_r_sym = MIPS64_r_sym; | |
602 | Elf64_r_info = MIPS64_r_info; | |
412910cd | 603 | is_fake_mcount64 = MIPS64_is_fake_mcount; |
a2d49358 | 604 | } |
3f1df120 MH |
605 | if (do64(ghdr, fname, reltype) < 0) |
606 | goto out; | |
e90b0c8b SR |
607 | break; |
608 | } | |
81d3858d JR |
609 | } /* end switch */ |
610 | ||
3f1df120 MH |
611 | rc = write_file(fname); |
612 | out: | |
4fbcf074 MH |
613 | file_append_cleanup(); |
614 | mmap_cleanup(); | |
3f1df120 | 615 | return rc; |
81d3858d JR |
616 | } |
617 | ||
3aec8638 | 618 | int main(int argc, char *argv[]) |
81d3858d | 619 | { |
cd3478f2 | 620 | const char ftrace[] = "/ftrace.o"; |
44475863 | 621 | int ftrace_size = sizeof(ftrace) - 1; |
81d3858d | 622 | int n_error = 0; /* gcc-4.3.0 false positive complaint */ |
dfad3d59 SR |
623 | int c; |
624 | int i; | |
44475863 | 625 | |
dfad3d59 SR |
626 | while ((c = getopt(argc, argv, "w")) >= 0) { |
627 | switch (c) { | |
628 | case 'w': | |
629 | warn_on_notrace_sect = 1; | |
630 | break; | |
631 | default: | |
632 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
633 | return 0; | |
634 | } | |
635 | } | |
636 | ||
637 | if ((argc - optind) < 1) { | |
638 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
44475863 SR |
639 | return 0; |
640 | } | |
641 | ||
642 | /* Process each file in turn, allowing deep failure. */ | |
dfad3d59 SR |
643 | for (i = optind; i < argc; i++) { |
644 | char *file = argv[i]; | |
44475863 SR |
645 | int len; |
646 | ||
647 | /* | |
648 | * The file kernel/trace/ftrace.o references the mcount | |
649 | * function but does not call it. Since ftrace.o should | |
650 | * not be traced anyway, we just skip it. | |
651 | */ | |
dfad3d59 | 652 | len = strlen(file); |
44475863 | 653 | if (len >= ftrace_size && |
dfad3d59 | 654 | strcmp(file + (len - ftrace_size), ftrace) == 0) |
44475863 SR |
655 | continue; |
656 | ||
3f1df120 | 657 | if (do_file(file)) { |
713a3e4d | 658 | fprintf(stderr, "%s: failed\n", file); |
81d3858d | 659 | ++n_error; |
3f1df120 | 660 | } |
81d3858d JR |
661 | } |
662 | return !!n_error; | |
663 | } |