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