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