Commit | Line | Data |
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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 | ||
81d3858d JR |
41 | static int fd_map; /* File descriptor for file being modified. */ |
42 | static int mmap_failed; /* Boolean flag. */ | |
81d3858d JR |
43 | static char gpfx; /* prefix for global symbol name (sometimes '_') */ |
44 | static struct stat sb; /* Remember .st_size, etc. */ | |
ed60453f | 45 | static const char *altmcount; /* alternate mcount symbol name */ |
dfad3d59 | 46 | static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */ |
a50bd439 SRRH |
47 | static void *file_map; /* pointer of the mapped file */ |
48 | static void *file_end; /* pointer to the end of the mapped file */ | |
49 | static int file_updated; /* flag to state file was changed */ | |
50 | static void *file_ptr; /* current file pointer location */ | |
51 | static void *file_append; /* added to the end of the file */ | |
52 | static size_t file_append_size; /* how much is added to end of file */ | |
81d3858d | 53 | |
81d3858d JR |
54 | /* Per-file resource cleanup when multiple files. */ |
55 | static void | |
56 | cleanup(void) | |
57 | { | |
58 | if (!mmap_failed) | |
a50bd439 | 59 | munmap(file_map, sb.st_size); |
81d3858d | 60 | else |
a50bd439 SRRH |
61 | free(file_map); |
62 | file_map = NULL; | |
63 | free(file_append); | |
64 | file_append = NULL; | |
65 | file_append_size = 0; | |
66 | file_updated = 0; | |
81d3858d JR |
67 | } |
68 | ||
a1462079 | 69 | /* ulseek, uwrite, ...: Check return value for errors. */ |
81d3858d JR |
70 | |
71 | static off_t | |
17e262e9 | 72 | ulseek(off_t const offset, int const whence) |
81d3858d | 73 | { |
a50bd439 SRRH |
74 | switch (whence) { |
75 | case SEEK_SET: | |
76 | file_ptr = file_map + offset; | |
77 | break; | |
78 | case SEEK_CUR: | |
79 | file_ptr += offset; | |
80 | break; | |
81 | case SEEK_END: | |
82 | file_ptr = file_map + (sb.st_size - offset); | |
83 | break; | |
84 | } | |
85 | if (file_ptr < file_map) { | |
86 | fprintf(stderr, "lseek: seek before file\n"); | |
3f1df120 | 87 | return -1; |
81d3858d | 88 | } |
a50bd439 | 89 | return file_ptr - file_map; |
81d3858d JR |
90 | } |
91 | ||
3f1df120 | 92 | static ssize_t |
17e262e9 | 93 | uwrite(void const *const buf, size_t const count) |
81d3858d | 94 | { |
a50bd439 SRRH |
95 | size_t cnt = count; |
96 | off_t idx = 0; | |
97 | ||
98 | file_updated = 1; | |
99 | ||
100 | if (file_ptr + count >= file_end) { | |
101 | off_t aoffset = (file_ptr + count) - file_end; | |
102 | ||
103 | if (aoffset > file_append_size) { | |
104 | file_append = realloc(file_append, aoffset); | |
105 | file_append_size = aoffset; | |
106 | } | |
107 | if (!file_append) { | |
108 | perror("write"); | |
3f1df120 MH |
109 | cleanup(); |
110 | return -1; | |
a50bd439 SRRH |
111 | } |
112 | if (file_ptr < file_end) { | |
113 | cnt = file_end - file_ptr; | |
114 | } else { | |
115 | cnt = 0; | |
116 | idx = aoffset - count; | |
117 | } | |
81d3858d | 118 | } |
a50bd439 SRRH |
119 | |
120 | if (cnt) | |
121 | memcpy(file_ptr, buf, cnt); | |
122 | ||
123 | if (cnt < count) | |
124 | memcpy(file_append + idx, buf + cnt, count - cnt); | |
125 | ||
126 | file_ptr += count; | |
127 | return count; | |
81d3858d JR |
128 | } |
129 | ||
130 | static void * | |
131 | umalloc(size_t size) | |
132 | { | |
133 | void *const addr = malloc(size); | |
dd5477ff | 134 | if (addr == 0) { |
81d3858d | 135 | fprintf(stderr, "malloc failed: %zu bytes\n", size); |
3f1df120 MH |
136 | cleanup(); |
137 | return NULL; | |
81d3858d JR |
138 | } |
139 | return addr; | |
140 | } | |
141 | ||
ffd618fa SR |
142 | static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
143 | static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; | |
144 | static unsigned char *ideal_nop; | |
145 | ||
146 | static char rel_type_nop; | |
147 | ||
148 | static int (*make_nop)(void *map, size_t const offset); | |
149 | ||
150 | static int make_nop_x86(void *map, size_t const offset) | |
151 | { | |
152 | uint32_t *ptr; | |
153 | unsigned char *op; | |
154 | ||
155 | /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ | |
156 | ptr = map + offset; | |
157 | if (*ptr != 0) | |
158 | return -1; | |
159 | ||
160 | op = map + offset - 1; | |
161 | if (*op != 0xe8) | |
162 | return -1; | |
163 | ||
164 | /* convert to nop */ | |
3f1df120 MH |
165 | if (ulseek(offset - 1, SEEK_SET) < 0) |
166 | return -1; | |
167 | if (uwrite(ideal_nop, 5) < 0) | |
168 | return -1; | |
ffd618fa SR |
169 | return 0; |
170 | } | |
171 | ||
9648dc15 SB |
172 | static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */ |
173 | static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */ | |
174 | static unsigned char *ideal_nop4_arm; | |
175 | ||
176 | static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */ | |
177 | static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */ | |
178 | static unsigned char *bl_mcount_arm; | |
179 | ||
180 | static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */ | |
181 | static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */ | |
182 | static unsigned char *push_arm; | |
183 | ||
184 | static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */ | |
185 | static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */ | |
186 | static unsigned char *ideal_nop2_thumb; | |
187 | ||
188 | static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */ | |
189 | static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */ | |
190 | static unsigned char *push_bl_mcount_thumb; | |
191 | ||
192 | static int make_nop_arm(void *map, size_t const offset) | |
193 | { | |
194 | char *ptr; | |
195 | int cnt = 1; | |
196 | int nop_size; | |
197 | size_t off = offset; | |
198 | ||
199 | ptr = map + offset; | |
200 | if (memcmp(ptr, bl_mcount_arm, 4) == 0) { | |
201 | if (memcmp(ptr - 4, push_arm, 4) == 0) { | |
202 | off -= 4; | |
203 | cnt = 2; | |
204 | } | |
205 | ideal_nop = ideal_nop4_arm; | |
206 | nop_size = 4; | |
207 | } else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) { | |
208 | cnt = 3; | |
209 | nop_size = 2; | |
210 | off -= 2; | |
211 | ideal_nop = ideal_nop2_thumb; | |
212 | } else | |
213 | return -1; | |
214 | ||
215 | /* Convert to nop */ | |
3f1df120 MH |
216 | if (ulseek(off, SEEK_SET) < 0) |
217 | return -1; | |
9648dc15 SB |
218 | |
219 | do { | |
3f1df120 MH |
220 | if (uwrite(ideal_nop, nop_size) < 0) |
221 | return -1; | |
9648dc15 SB |
222 | } while (--cnt > 0); |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
2ee8a74f LB |
227 | static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5}; |
228 | static int make_nop_arm64(void *map, size_t const offset) | |
229 | { | |
230 | uint32_t *ptr; | |
231 | ||
232 | ptr = map + offset; | |
233 | /* bl <_mcount> is 0x94000000 before relocation */ | |
234 | if (*ptr != 0x94000000) | |
235 | return -1; | |
236 | ||
237 | /* Convert to nop */ | |
3f1df120 MH |
238 | if (ulseek(offset, SEEK_SET) < 0) |
239 | return -1; | |
240 | if (uwrite(ideal_nop, 4) < 0) | |
241 | return -1; | |
2ee8a74f LB |
242 | return 0; |
243 | } | |
244 | ||
81d3858d JR |
245 | /* |
246 | * Get the whole file as a programming convenience in order to avoid | |
247 | * malloc+lseek+read+free of many pieces. If successful, then mmap | |
248 | * avoids copying unused pieces; else just read the whole file. | |
249 | * Open for both read and write; new info will be appended to the file. | |
250 | * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr | |
251 | * do not propagate to the file until an explicit overwrite at the last. | |
252 | * This preserves most aspects of consistency (all except .st_size) | |
253 | * for simultaneous readers of the file while we are appending to it. | |
254 | * However, multiple writers still are bad. We choose not to use | |
255 | * locking because it is expensive and the use case of kernel build | |
256 | * makes multiple writers unlikely. | |
257 | */ | |
258 | static void *mmap_file(char const *fname) | |
259 | { | |
3f1df120 MH |
260 | file_map = NULL; |
261 | sb.st_size = 0; | |
a50bd439 | 262 | fd_map = open(fname, O_RDONLY); |
3f1df120 MH |
263 | if (fd_map < 0) { |
264 | perror(fname); | |
265 | cleanup(); | |
266 | return NULL; | |
267 | } | |
268 | if (fstat(fd_map, &sb) < 0) { | |
81d3858d | 269 | perror(fname); |
3f1df120 MH |
270 | cleanup(); |
271 | goto out; | |
81d3858d JR |
272 | } |
273 | if (!S_ISREG(sb.st_mode)) { | |
274 | fprintf(stderr, "not a regular file: %s\n", fname); | |
3f1df120 MH |
275 | cleanup(); |
276 | goto out; | |
81d3858d | 277 | } |
a50bd439 SRRH |
278 | file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, |
279 | fd_map, 0); | |
81d3858d | 280 | mmap_failed = 0; |
a50bd439 | 281 | if (file_map == MAP_FAILED) { |
81d3858d | 282 | mmap_failed = 1; |
a50bd439 | 283 | file_map = umalloc(sb.st_size); |
3f1df120 MH |
284 | if (!file_map) { |
285 | perror(fname); | |
286 | goto out; | |
287 | } | |
a1462079 MH |
288 | if (read(fd_map, file_map, sb.st_size) != sb.st_size) { |
289 | perror(fname); | |
3f1df120 MH |
290 | free(file_map); |
291 | file_map = NULL; | |
292 | goto out; | |
a1462079 | 293 | } |
81d3858d | 294 | } |
3f1df120 | 295 | out: |
a50bd439 SRRH |
296 | close(fd_map); |
297 | ||
298 | file_end = file_map + sb.st_size; | |
299 | ||
300 | return file_map; | |
301 | } | |
302 | ||
3f1df120 | 303 | static int write_file(const char *fname) |
a50bd439 SRRH |
304 | { |
305 | char tmp_file[strlen(fname) + 4]; | |
306 | size_t n; | |
307 | ||
308 | if (!file_updated) | |
3f1df120 | 309 | return 0; |
a50bd439 SRRH |
310 | |
311 | sprintf(tmp_file, "%s.rc", fname); | |
312 | ||
313 | /* | |
314 | * After reading the entire file into memory, delete it | |
315 | * and write it back, to prevent weird side effects of modifying | |
316 | * an object file in place. | |
317 | */ | |
318 | fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode); | |
319 | if (fd_map < 0) { | |
320 | perror(fname); | |
3f1df120 MH |
321 | cleanup(); |
322 | return -1; | |
a50bd439 SRRH |
323 | } |
324 | n = write(fd_map, file_map, sb.st_size); | |
325 | if (n != sb.st_size) { | |
326 | perror("write"); | |
3f1df120 MH |
327 | cleanup(); |
328 | close(fd_map); | |
329 | return -1; | |
a50bd439 SRRH |
330 | } |
331 | if (file_append_size) { | |
332 | n = write(fd_map, file_append, file_append_size); | |
333 | if (n != file_append_size) { | |
334 | perror("write"); | |
3f1df120 MH |
335 | cleanup(); |
336 | close(fd_map); | |
337 | return -1; | |
dd39a265 | 338 | } |
dd39a265 | 339 | } |
a50bd439 SRRH |
340 | close(fd_map); |
341 | if (rename(tmp_file, fname) < 0) { | |
342 | perror(fname); | |
3f1df120 MH |
343 | cleanup(); |
344 | return -1; | |
a50bd439 | 345 | } |
3f1df120 | 346 | return 0; |
81d3858d JR |
347 | } |
348 | ||
349 | /* w8rev, w8nat, ...: Handle endianness. */ | |
350 | ||
351 | static uint64_t w8rev(uint64_t const x) | |
352 | { | |
353 | return ((0xff & (x >> (0 * 8))) << (7 * 8)) | |
354 | | ((0xff & (x >> (1 * 8))) << (6 * 8)) | |
355 | | ((0xff & (x >> (2 * 8))) << (5 * 8)) | |
356 | | ((0xff & (x >> (3 * 8))) << (4 * 8)) | |
357 | | ((0xff & (x >> (4 * 8))) << (3 * 8)) | |
358 | | ((0xff & (x >> (5 * 8))) << (2 * 8)) | |
359 | | ((0xff & (x >> (6 * 8))) << (1 * 8)) | |
360 | | ((0xff & (x >> (7 * 8))) << (0 * 8)); | |
361 | } | |
362 | ||
363 | static uint32_t w4rev(uint32_t const x) | |
364 | { | |
365 | return ((0xff & (x >> (0 * 8))) << (3 * 8)) | |
366 | | ((0xff & (x >> (1 * 8))) << (2 * 8)) | |
367 | | ((0xff & (x >> (2 * 8))) << (1 * 8)) | |
368 | | ((0xff & (x >> (3 * 8))) << (0 * 8)); | |
369 | } | |
370 | ||
371 | static uint32_t w2rev(uint16_t const x) | |
372 | { | |
373 | return ((0xff & (x >> (0 * 8))) << (1 * 8)) | |
374 | | ((0xff & (x >> (1 * 8))) << (0 * 8)); | |
375 | } | |
376 | ||
377 | static uint64_t w8nat(uint64_t const x) | |
378 | { | |
379 | return x; | |
380 | } | |
381 | ||
382 | static uint32_t w4nat(uint32_t const x) | |
383 | { | |
384 | return x; | |
385 | } | |
386 | ||
387 | static uint32_t w2nat(uint16_t const x) | |
388 | { | |
389 | return x; | |
390 | } | |
391 | ||
392 | static uint64_t (*w8)(uint64_t); | |
393 | static uint32_t (*w)(uint32_t); | |
394 | static uint32_t (*w2)(uint16_t); | |
395 | ||
396 | /* Names of the sections that could contain calls to mcount. */ | |
397 | static int | |
398 | is_mcounted_section_name(char const *const txtname) | |
399 | { | |
9c8e2f6d | 400 | return strncmp(".text", txtname, 5) == 0 || |
42c269c8 | 401 | strcmp(".init.text", txtname) == 0 || |
dd5477ff SR |
402 | strcmp(".ref.text", txtname) == 0 || |
403 | strcmp(".sched.text", txtname) == 0 || | |
404 | strcmp(".spinlock.text", txtname) == 0 || | |
405 | strcmp(".irqentry.text", txtname) == 0 || | |
e436fd61 | 406 | strcmp(".softirqentry.text", txtname) == 0 || |
9f087e76 | 407 | strcmp(".kprobes.text", txtname) == 0 || |
1bd95be2 | 408 | strcmp(".cpuidle.text", txtname) == 0; |
81d3858d JR |
409 | } |
410 | ||
3f1df120 MH |
411 | static char const *already_has_rel_mcount = "success"; /* our work here is done! */ |
412 | ||
c28d5077 SR |
413 | /* 32 bit and 64 bit are very similar */ |
414 | #include "recordmcount.h" | |
415 | #define RECORD_MCOUNT_64 | |
416 | #include "recordmcount.h" | |
81d3858d | 417 | |
a2d49358 JR |
418 | /* 64-bit EM_MIPS has weird ELF64_Rela.r_info. |
419 | * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf | |
420 | * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] | |
421 | * to imply the order of the members; the spec does not say so. | |
422 | * typedef unsigned char Elf64_Byte; | |
423 | * fails on MIPS64 because their <elf.h> already has it! | |
424 | */ | |
425 | ||
426 | typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ | |
427 | ||
428 | union mips_r_info { | |
429 | Elf64_Xword r_info; | |
430 | struct { | |
431 | Elf64_Word r_sym; /* Symbol index. */ | |
432 | myElf64_Byte r_ssym; /* Special symbol. */ | |
433 | myElf64_Byte r_type3; /* Third relocation. */ | |
434 | myElf64_Byte r_type2; /* Second relocation. */ | |
435 | myElf64_Byte r_type; /* First relocation. */ | |
436 | } r_mips; | |
437 | }; | |
438 | ||
439 | static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) | |
440 | { | |
441 | return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); | |
442 | } | |
443 | ||
444 | static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) | |
445 | { | |
446 | rp->r_info = ((union mips_r_info){ | |
447 | .r_mips = { .r_sym = w(sym), .r_type = type } | |
448 | }).r_info; | |
449 | } | |
450 | ||
3f1df120 | 451 | static int |
81d3858d JR |
452 | do_file(char const *const fname) |
453 | { | |
454 | Elf32_Ehdr *const ehdr = mmap_file(fname); | |
455 | unsigned int reltype = 0; | |
3f1df120 MH |
456 | int rc = -1; |
457 | ||
458 | if (!ehdr) | |
459 | goto out; | |
81d3858d | 460 | |
81d3858d JR |
461 | w = w4nat; |
462 | w2 = w2nat; | |
463 | w8 = w8nat; | |
464 | switch (ehdr->e_ident[EI_DATA]) { | |
465 | static unsigned int const endian = 1; | |
e90b0c8b | 466 | default: |
81d3858d JR |
467 | fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", |
468 | ehdr->e_ident[EI_DATA], fname); | |
3f1df120 MH |
469 | cleanup(); |
470 | goto out; | |
e90b0c8b | 471 | case ELFDATA2LSB: |
dd5477ff | 472 | if (*(unsigned char const *)&endian != 1) { |
81d3858d JR |
473 | /* main() is big endian, file.o is little endian. */ |
474 | w = w4rev; | |
475 | w2 = w2rev; | |
476 | w8 = w8rev; | |
477 | } | |
9648dc15 SB |
478 | ideal_nop4_arm = ideal_nop4_arm_le; |
479 | bl_mcount_arm = bl_mcount_arm_le; | |
480 | push_arm = push_arm_le; | |
481 | ideal_nop2_thumb = ideal_nop2_thumb_le; | |
482 | push_bl_mcount_thumb = push_bl_mcount_thumb_le; | |
e90b0c8b SR |
483 | break; |
484 | case ELFDATA2MSB: | |
dd5477ff | 485 | if (*(unsigned char const *)&endian != 0) { |
81d3858d JR |
486 | /* main() is little endian, file.o is big endian. */ |
487 | w = w4rev; | |
488 | w2 = w2rev; | |
489 | w8 = w8rev; | |
490 | } | |
9648dc15 SB |
491 | ideal_nop4_arm = ideal_nop4_arm_be; |
492 | bl_mcount_arm = bl_mcount_arm_be; | |
493 | push_arm = push_arm_be; | |
494 | ideal_nop2_thumb = ideal_nop2_thumb_be; | |
495 | push_bl_mcount_thumb = push_bl_mcount_thumb_be; | |
e90b0c8b | 496 | break; |
81d3858d | 497 | } /* end switch */ |
dd5477ff SR |
498 | if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 |
499 | || w2(ehdr->e_type) != ET_REL | |
500 | || ehdr->e_ident[EI_VERSION] != EV_CURRENT) { | |
81d3858d | 501 | fprintf(stderr, "unrecognized ET_REL file %s\n", fname); |
3f1df120 MH |
502 | cleanup(); |
503 | goto out; | |
81d3858d JR |
504 | } |
505 | ||
506 | gpfx = 0; | |
507 | switch (w2(ehdr->e_machine)) { | |
e90b0c8b | 508 | default: |
ac5db1fc | 509 | fprintf(stderr, "unrecognized e_machine %u %s\n", |
81d3858d | 510 | w2(ehdr->e_machine), fname); |
3f1df120 MH |
511 | cleanup(); |
512 | goto out; | |
ffd618fa SR |
513 | case EM_386: |
514 | reltype = R_386_32; | |
46a2b61e | 515 | rel_type_nop = R_386_NONE; |
ffd618fa SR |
516 | make_nop = make_nop_x86; |
517 | ideal_nop = ideal_nop5_x86_32; | |
521ccb5c | 518 | mcount_adjust_32 = -1; |
ffd618fa | 519 | break; |
ed60453f RV |
520 | case EM_ARM: reltype = R_ARM_ABS32; |
521 | altmcount = "__gnu_mcount_nc"; | |
9648dc15 SB |
522 | make_nop = make_nop_arm; |
523 | rel_type_nop = R_ARM_NONE; | |
ed60453f | 524 | break; |
af64d2aa | 525 | case EM_AARCH64: |
2ee8a74f LB |
526 | reltype = R_AARCH64_ABS64; |
527 | make_nop = make_nop_arm64; | |
528 | rel_type_nop = R_AARCH64_NONE; | |
529 | ideal_nop = ideal_nop4_arm64; | |
530 | gpfx = '_'; | |
531 | break; | |
81d3858d | 532 | case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break; |
a2d49358 | 533 | case EM_MIPS: /* reltype: e_class */ gpfx = '_'; break; |
81d3858d JR |
534 | case EM_PPC: reltype = R_PPC_ADDR32; gpfx = '_'; break; |
535 | case EM_PPC64: reltype = R_PPC64_ADDR64; gpfx = '_'; break; | |
536 | case EM_S390: /* reltype: e_class */ gpfx = '_'; break; | |
537 | case EM_SH: reltype = R_SH_DIR32; break; | |
538 | case EM_SPARCV9: reltype = R_SPARC_64; gpfx = '_'; break; | |
ffd618fa SR |
539 | case EM_X86_64: |
540 | make_nop = make_nop_x86; | |
541 | ideal_nop = ideal_nop5_x86_64; | |
542 | reltype = R_X86_64_64; | |
46a2b61e | 543 | rel_type_nop = R_X86_64_NONE; |
521ccb5c | 544 | mcount_adjust_64 = -1; |
ffd618fa | 545 | break; |
81d3858d JR |
546 | } /* end switch */ |
547 | ||
548 | switch (ehdr->e_ident[EI_CLASS]) { | |
e90b0c8b | 549 | default: |
81d3858d JR |
550 | fprintf(stderr, "unrecognized ELF class %d %s\n", |
551 | ehdr->e_ident[EI_CLASS], fname); | |
3f1df120 MH |
552 | cleanup(); |
553 | goto out; | |
e90b0c8b | 554 | case ELFCLASS32: |
dd5477ff SR |
555 | if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) |
556 | || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { | |
81d3858d JR |
557 | fprintf(stderr, |
558 | "unrecognized ET_REL file: %s\n", fname); | |
3f1df120 MH |
559 | cleanup(); |
560 | goto out; | |
81d3858d | 561 | } |
dd5477ff | 562 | if (w2(ehdr->e_machine) == EM_MIPS) { |
a2d49358 | 563 | reltype = R_MIPS_32; |
412910cd WZ |
564 | is_fake_mcount32 = MIPS32_is_fake_mcount; |
565 | } | |
3f1df120 MH |
566 | if (do32(ehdr, fname, reltype) < 0) |
567 | goto out; | |
e90b0c8b | 568 | break; |
81d3858d JR |
569 | case ELFCLASS64: { |
570 | Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; | |
dd5477ff SR |
571 | if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) |
572 | || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { | |
81d3858d JR |
573 | fprintf(stderr, |
574 | "unrecognized ET_REL file: %s\n", fname); | |
3f1df120 MH |
575 | cleanup(); |
576 | goto out; | |
81d3858d | 577 | } |
f2963886 | 578 | if (w2(ghdr->e_machine) == EM_S390) { |
81d3858d | 579 | reltype = R_390_64; |
c933146a | 580 | mcount_adjust_64 = -14; |
f2963886 | 581 | } |
dd5477ff | 582 | if (w2(ghdr->e_machine) == EM_MIPS) { |
a2d49358 JR |
583 | reltype = R_MIPS_64; |
584 | Elf64_r_sym = MIPS64_r_sym; | |
585 | Elf64_r_info = MIPS64_r_info; | |
412910cd | 586 | is_fake_mcount64 = MIPS64_is_fake_mcount; |
a2d49358 | 587 | } |
3f1df120 MH |
588 | if (do64(ghdr, fname, reltype) < 0) |
589 | goto out; | |
e90b0c8b SR |
590 | break; |
591 | } | |
81d3858d JR |
592 | } /* end switch */ |
593 | ||
3f1df120 MH |
594 | rc = write_file(fname); |
595 | out: | |
81d3858d | 596 | cleanup(); |
3f1df120 | 597 | return rc; |
81d3858d JR |
598 | } |
599 | ||
600 | int | |
dfad3d59 | 601 | main(int argc, char *argv[]) |
81d3858d | 602 | { |
cd3478f2 | 603 | const char ftrace[] = "/ftrace.o"; |
44475863 | 604 | int ftrace_size = sizeof(ftrace) - 1; |
81d3858d | 605 | int n_error = 0; /* gcc-4.3.0 false positive complaint */ |
dfad3d59 SR |
606 | int c; |
607 | int i; | |
44475863 | 608 | |
dfad3d59 SR |
609 | while ((c = getopt(argc, argv, "w")) >= 0) { |
610 | switch (c) { | |
611 | case 'w': | |
612 | warn_on_notrace_sect = 1; | |
613 | break; | |
614 | default: | |
615 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
616 | return 0; | |
617 | } | |
618 | } | |
619 | ||
620 | if ((argc - optind) < 1) { | |
621 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
44475863 SR |
622 | return 0; |
623 | } | |
624 | ||
625 | /* Process each file in turn, allowing deep failure. */ | |
dfad3d59 SR |
626 | for (i = optind; i < argc; i++) { |
627 | char *file = argv[i]; | |
44475863 SR |
628 | int len; |
629 | ||
630 | /* | |
631 | * The file kernel/trace/ftrace.o references the mcount | |
632 | * function but does not call it. Since ftrace.o should | |
633 | * not be traced anyway, we just skip it. | |
634 | */ | |
dfad3d59 | 635 | len = strlen(file); |
44475863 | 636 | if (len >= ftrace_size && |
dfad3d59 | 637 | strcmp(file + (len - ftrace_size), ftrace) == 0) |
44475863 SR |
638 | continue; |
639 | ||
3f1df120 MH |
640 | /* Avoid problems if early cleanup() */ |
641 | fd_map = -1; | |
642 | mmap_failed = 1; | |
643 | file_map = NULL; | |
644 | file_ptr = NULL; | |
645 | file_updated = 0; | |
646 | if (do_file(file)) { | |
713a3e4d | 647 | fprintf(stderr, "%s: failed\n", file); |
81d3858d | 648 | ++n_error; |
3f1df120 | 649 | } |
81d3858d JR |
650 | } |
651 | return !!n_error; | |
652 | } |