Commit | Line | Data |
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81d3858d JR |
1 | /* |
2 | * recordmcount.c: construct a table of the locations of calls to 'mcount' | |
3 | * so that ftrace can find them quickly. | |
4 | * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. | |
5 | * Licensed under the GNU General Public License, version 2 (GPLv2). | |
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 | ||
00512bdd JH |
36 | #ifndef EM_METAG |
37 | /* Remove this when these make it to the standard system elf.h. */ | |
38 | #define EM_METAG 174 | |
39 | #define R_METAG_ADDR32 2 | |
40 | #define R_METAG_NONE 3 | |
41 | #endif | |
42 | ||
af64d2aa AT |
43 | #ifndef EM_AARCH64 |
44 | #define EM_AARCH64 183 | |
2ee8a74f | 45 | #define R_AARCH64_NONE 0 |
af64d2aa AT |
46 | #define R_AARCH64_ABS64 257 |
47 | #endif | |
48 | ||
81d3858d JR |
49 | static int fd_map; /* File descriptor for file being modified. */ |
50 | static int mmap_failed; /* Boolean flag. */ | |
81d3858d JR |
51 | static char gpfx; /* prefix for global symbol name (sometimes '_') */ |
52 | static struct stat sb; /* Remember .st_size, etc. */ | |
53 | static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */ | |
ed60453f | 54 | static const char *altmcount; /* alternate mcount symbol name */ |
dfad3d59 | 55 | static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */ |
a50bd439 SRRH |
56 | static void *file_map; /* pointer of the mapped file */ |
57 | static void *file_end; /* pointer to the end of the mapped file */ | |
58 | static int file_updated; /* flag to state file was changed */ | |
59 | static void *file_ptr; /* current file pointer location */ | |
60 | static void *file_append; /* added to the end of the file */ | |
61 | static size_t file_append_size; /* how much is added to end of file */ | |
81d3858d JR |
62 | |
63 | /* setjmp() return values */ | |
64 | enum { | |
65 | SJ_SETJMP = 0, /* hardwired first return */ | |
66 | SJ_FAIL, | |
67 | SJ_SUCCEED | |
68 | }; | |
69 | ||
70 | /* Per-file resource cleanup when multiple files. */ | |
71 | static void | |
72 | cleanup(void) | |
73 | { | |
74 | if (!mmap_failed) | |
a50bd439 | 75 | munmap(file_map, sb.st_size); |
81d3858d | 76 | else |
a50bd439 SRRH |
77 | free(file_map); |
78 | file_map = NULL; | |
79 | free(file_append); | |
80 | file_append = NULL; | |
81 | file_append_size = 0; | |
82 | file_updated = 0; | |
81d3858d JR |
83 | } |
84 | ||
85 | static void __attribute__((noreturn)) | |
86 | fail_file(void) | |
87 | { | |
88 | cleanup(); | |
89 | longjmp(jmpenv, SJ_FAIL); | |
90 | } | |
91 | ||
92 | static void __attribute__((noreturn)) | |
93 | succeed_file(void) | |
94 | { | |
95 | cleanup(); | |
96 | longjmp(jmpenv, SJ_SUCCEED); | |
97 | } | |
98 | ||
99 | /* ulseek, uread, ...: Check return value for errors. */ | |
100 | ||
101 | static off_t | |
102 | ulseek(int const fd, off_t const offset, int const whence) | |
103 | { | |
a50bd439 SRRH |
104 | switch (whence) { |
105 | case SEEK_SET: | |
106 | file_ptr = file_map + offset; | |
107 | break; | |
108 | case SEEK_CUR: | |
109 | file_ptr += offset; | |
110 | break; | |
111 | case SEEK_END: | |
112 | file_ptr = file_map + (sb.st_size - offset); | |
113 | break; | |
114 | } | |
115 | if (file_ptr < file_map) { | |
116 | fprintf(stderr, "lseek: seek before file\n"); | |
81d3858d JR |
117 | fail_file(); |
118 | } | |
a50bd439 | 119 | return file_ptr - file_map; |
81d3858d JR |
120 | } |
121 | ||
122 | static size_t | |
123 | uread(int const fd, void *const buf, size_t const count) | |
124 | { | |
125 | size_t const n = read(fd, buf, count); | |
126 | if (n != count) { | |
127 | perror("read"); | |
128 | fail_file(); | |
129 | } | |
130 | return n; | |
131 | } | |
132 | ||
133 | static size_t | |
134 | uwrite(int const fd, void const *const buf, size_t const count) | |
135 | { | |
a50bd439 SRRH |
136 | size_t cnt = count; |
137 | off_t idx = 0; | |
138 | ||
139 | file_updated = 1; | |
140 | ||
141 | if (file_ptr + count >= file_end) { | |
142 | off_t aoffset = (file_ptr + count) - file_end; | |
143 | ||
144 | if (aoffset > file_append_size) { | |
145 | file_append = realloc(file_append, aoffset); | |
146 | file_append_size = aoffset; | |
147 | } | |
148 | if (!file_append) { | |
149 | perror("write"); | |
150 | fail_file(); | |
151 | } | |
152 | if (file_ptr < file_end) { | |
153 | cnt = file_end - file_ptr; | |
154 | } else { | |
155 | cnt = 0; | |
156 | idx = aoffset - count; | |
157 | } | |
81d3858d | 158 | } |
a50bd439 SRRH |
159 | |
160 | if (cnt) | |
161 | memcpy(file_ptr, buf, cnt); | |
162 | ||
163 | if (cnt < count) | |
164 | memcpy(file_append + idx, buf + cnt, count - cnt); | |
165 | ||
166 | file_ptr += count; | |
167 | return count; | |
81d3858d JR |
168 | } |
169 | ||
170 | static void * | |
171 | umalloc(size_t size) | |
172 | { | |
173 | void *const addr = malloc(size); | |
dd5477ff | 174 | if (addr == 0) { |
81d3858d JR |
175 | fprintf(stderr, "malloc failed: %zu bytes\n", size); |
176 | fail_file(); | |
177 | } | |
178 | return addr; | |
179 | } | |
180 | ||
ffd618fa SR |
181 | static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
182 | static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; | |
183 | static unsigned char *ideal_nop; | |
184 | ||
185 | static char rel_type_nop; | |
186 | ||
187 | static int (*make_nop)(void *map, size_t const offset); | |
188 | ||
189 | static int make_nop_x86(void *map, size_t const offset) | |
190 | { | |
191 | uint32_t *ptr; | |
192 | unsigned char *op; | |
193 | ||
194 | /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ | |
195 | ptr = map + offset; | |
196 | if (*ptr != 0) | |
197 | return -1; | |
198 | ||
199 | op = map + offset - 1; | |
200 | if (*op != 0xe8) | |
201 | return -1; | |
202 | ||
203 | /* convert to nop */ | |
204 | ulseek(fd_map, offset - 1, SEEK_SET); | |
205 | uwrite(fd_map, ideal_nop, 5); | |
206 | return 0; | |
207 | } | |
208 | ||
2ee8a74f LB |
209 | static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5}; |
210 | static int make_nop_arm64(void *map, size_t const offset) | |
211 | { | |
212 | uint32_t *ptr; | |
213 | ||
214 | ptr = map + offset; | |
215 | /* bl <_mcount> is 0x94000000 before relocation */ | |
216 | if (*ptr != 0x94000000) | |
217 | return -1; | |
218 | ||
219 | /* Convert to nop */ | |
220 | ulseek(fd_map, offset, SEEK_SET); | |
221 | uwrite(fd_map, ideal_nop, 4); | |
222 | return 0; | |
223 | } | |
224 | ||
81d3858d JR |
225 | /* |
226 | * Get the whole file as a programming convenience in order to avoid | |
227 | * malloc+lseek+read+free of many pieces. If successful, then mmap | |
228 | * avoids copying unused pieces; else just read the whole file. | |
229 | * Open for both read and write; new info will be appended to the file. | |
230 | * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr | |
231 | * do not propagate to the file until an explicit overwrite at the last. | |
232 | * This preserves most aspects of consistency (all except .st_size) | |
233 | * for simultaneous readers of the file while we are appending to it. | |
234 | * However, multiple writers still are bad. We choose not to use | |
235 | * locking because it is expensive and the use case of kernel build | |
236 | * makes multiple writers unlikely. | |
237 | */ | |
238 | static void *mmap_file(char const *fname) | |
239 | { | |
a50bd439 | 240 | fd_map = open(fname, O_RDONLY); |
dd5477ff | 241 | if (fd_map < 0 || fstat(fd_map, &sb) < 0) { |
81d3858d JR |
242 | perror(fname); |
243 | fail_file(); | |
244 | } | |
245 | if (!S_ISREG(sb.st_mode)) { | |
246 | fprintf(stderr, "not a regular file: %s\n", fname); | |
247 | fail_file(); | |
248 | } | |
a50bd439 SRRH |
249 | file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, |
250 | fd_map, 0); | |
81d3858d | 251 | mmap_failed = 0; |
a50bd439 | 252 | if (file_map == MAP_FAILED) { |
81d3858d | 253 | mmap_failed = 1; |
a50bd439 SRRH |
254 | file_map = umalloc(sb.st_size); |
255 | uread(fd_map, file_map, sb.st_size); | |
81d3858d | 256 | } |
a50bd439 SRRH |
257 | close(fd_map); |
258 | ||
259 | file_end = file_map + sb.st_size; | |
260 | ||
261 | return file_map; | |
262 | } | |
263 | ||
264 | static void write_file(const char *fname) | |
265 | { | |
266 | char tmp_file[strlen(fname) + 4]; | |
267 | size_t n; | |
268 | ||
269 | if (!file_updated) | |
270 | return; | |
271 | ||
272 | sprintf(tmp_file, "%s.rc", fname); | |
273 | ||
274 | /* | |
275 | * After reading the entire file into memory, delete it | |
276 | * and write it back, to prevent weird side effects of modifying | |
277 | * an object file in place. | |
278 | */ | |
279 | fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode); | |
280 | if (fd_map < 0) { | |
281 | perror(fname); | |
282 | fail_file(); | |
283 | } | |
284 | n = write(fd_map, file_map, sb.st_size); | |
285 | if (n != sb.st_size) { | |
286 | perror("write"); | |
287 | fail_file(); | |
288 | } | |
289 | if (file_append_size) { | |
290 | n = write(fd_map, file_append, file_append_size); | |
291 | if (n != file_append_size) { | |
292 | perror("write"); | |
dd39a265 RK |
293 | fail_file(); |
294 | } | |
dd39a265 | 295 | } |
a50bd439 SRRH |
296 | close(fd_map); |
297 | if (rename(tmp_file, fname) < 0) { | |
298 | perror(fname); | |
299 | fail_file(); | |
300 | } | |
81d3858d JR |
301 | } |
302 | ||
303 | /* w8rev, w8nat, ...: Handle endianness. */ | |
304 | ||
305 | static uint64_t w8rev(uint64_t const x) | |
306 | { | |
307 | return ((0xff & (x >> (0 * 8))) << (7 * 8)) | |
308 | | ((0xff & (x >> (1 * 8))) << (6 * 8)) | |
309 | | ((0xff & (x >> (2 * 8))) << (5 * 8)) | |
310 | | ((0xff & (x >> (3 * 8))) << (4 * 8)) | |
311 | | ((0xff & (x >> (4 * 8))) << (3 * 8)) | |
312 | | ((0xff & (x >> (5 * 8))) << (2 * 8)) | |
313 | | ((0xff & (x >> (6 * 8))) << (1 * 8)) | |
314 | | ((0xff & (x >> (7 * 8))) << (0 * 8)); | |
315 | } | |
316 | ||
317 | static uint32_t w4rev(uint32_t const x) | |
318 | { | |
319 | return ((0xff & (x >> (0 * 8))) << (3 * 8)) | |
320 | | ((0xff & (x >> (1 * 8))) << (2 * 8)) | |
321 | | ((0xff & (x >> (2 * 8))) << (1 * 8)) | |
322 | | ((0xff & (x >> (3 * 8))) << (0 * 8)); | |
323 | } | |
324 | ||
325 | static uint32_t w2rev(uint16_t const x) | |
326 | { | |
327 | return ((0xff & (x >> (0 * 8))) << (1 * 8)) | |
328 | | ((0xff & (x >> (1 * 8))) << (0 * 8)); | |
329 | } | |
330 | ||
331 | static uint64_t w8nat(uint64_t const x) | |
332 | { | |
333 | return x; | |
334 | } | |
335 | ||
336 | static uint32_t w4nat(uint32_t const x) | |
337 | { | |
338 | return x; | |
339 | } | |
340 | ||
341 | static uint32_t w2nat(uint16_t const x) | |
342 | { | |
343 | return x; | |
344 | } | |
345 | ||
346 | static uint64_t (*w8)(uint64_t); | |
347 | static uint32_t (*w)(uint32_t); | |
348 | static uint32_t (*w2)(uint16_t); | |
349 | ||
350 | /* Names of the sections that could contain calls to mcount. */ | |
351 | static int | |
352 | is_mcounted_section_name(char const *const txtname) | |
353 | { | |
dd5477ff SR |
354 | return strcmp(".text", txtname) == 0 || |
355 | strcmp(".ref.text", txtname) == 0 || | |
356 | strcmp(".sched.text", txtname) == 0 || | |
357 | strcmp(".spinlock.text", txtname) == 0 || | |
358 | strcmp(".irqentry.text", txtname) == 0 || | |
9f087e76 | 359 | strcmp(".kprobes.text", txtname) == 0 || |
dd5477ff | 360 | strcmp(".text.unlikely", txtname) == 0; |
81d3858d JR |
361 | } |
362 | ||
c28d5077 SR |
363 | /* 32 bit and 64 bit are very similar */ |
364 | #include "recordmcount.h" | |
365 | #define RECORD_MCOUNT_64 | |
366 | #include "recordmcount.h" | |
81d3858d | 367 | |
a2d49358 JR |
368 | /* 64-bit EM_MIPS has weird ELF64_Rela.r_info. |
369 | * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf | |
370 | * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] | |
371 | * to imply the order of the members; the spec does not say so. | |
372 | * typedef unsigned char Elf64_Byte; | |
373 | * fails on MIPS64 because their <elf.h> already has it! | |
374 | */ | |
375 | ||
376 | typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ | |
377 | ||
378 | union mips_r_info { | |
379 | Elf64_Xword r_info; | |
380 | struct { | |
381 | Elf64_Word r_sym; /* Symbol index. */ | |
382 | myElf64_Byte r_ssym; /* Special symbol. */ | |
383 | myElf64_Byte r_type3; /* Third relocation. */ | |
384 | myElf64_Byte r_type2; /* Second relocation. */ | |
385 | myElf64_Byte r_type; /* First relocation. */ | |
386 | } r_mips; | |
387 | }; | |
388 | ||
389 | static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) | |
390 | { | |
391 | return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); | |
392 | } | |
393 | ||
394 | static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) | |
395 | { | |
396 | rp->r_info = ((union mips_r_info){ | |
397 | .r_mips = { .r_sym = w(sym), .r_type = type } | |
398 | }).r_info; | |
399 | } | |
400 | ||
81d3858d JR |
401 | static void |
402 | do_file(char const *const fname) | |
403 | { | |
404 | Elf32_Ehdr *const ehdr = mmap_file(fname); | |
405 | unsigned int reltype = 0; | |
406 | ||
81d3858d JR |
407 | w = w4nat; |
408 | w2 = w2nat; | |
409 | w8 = w8nat; | |
410 | switch (ehdr->e_ident[EI_DATA]) { | |
411 | static unsigned int const endian = 1; | |
e90b0c8b | 412 | default: |
81d3858d JR |
413 | fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", |
414 | ehdr->e_ident[EI_DATA], fname); | |
415 | fail_file(); | |
e90b0c8b SR |
416 | break; |
417 | case ELFDATA2LSB: | |
dd5477ff | 418 | if (*(unsigned char const *)&endian != 1) { |
81d3858d JR |
419 | /* main() is big endian, file.o is little endian. */ |
420 | w = w4rev; | |
421 | w2 = w2rev; | |
422 | w8 = w8rev; | |
423 | } | |
e90b0c8b SR |
424 | break; |
425 | case ELFDATA2MSB: | |
dd5477ff | 426 | if (*(unsigned char const *)&endian != 0) { |
81d3858d JR |
427 | /* main() is little endian, file.o is big endian. */ |
428 | w = w4rev; | |
429 | w2 = w2rev; | |
430 | w8 = w8rev; | |
431 | } | |
e90b0c8b | 432 | break; |
81d3858d | 433 | } /* end switch */ |
dd5477ff SR |
434 | if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 |
435 | || w2(ehdr->e_type) != ET_REL | |
436 | || ehdr->e_ident[EI_VERSION] != EV_CURRENT) { | |
81d3858d JR |
437 | fprintf(stderr, "unrecognized ET_REL file %s\n", fname); |
438 | fail_file(); | |
439 | } | |
440 | ||
441 | gpfx = 0; | |
442 | switch (w2(ehdr->e_machine)) { | |
e90b0c8b | 443 | default: |
81d3858d JR |
444 | fprintf(stderr, "unrecognized e_machine %d %s\n", |
445 | w2(ehdr->e_machine), fname); | |
446 | fail_file(); | |
e90b0c8b | 447 | break; |
ffd618fa SR |
448 | case EM_386: |
449 | reltype = R_386_32; | |
46a2b61e | 450 | rel_type_nop = R_386_NONE; |
ffd618fa SR |
451 | make_nop = make_nop_x86; |
452 | ideal_nop = ideal_nop5_x86_32; | |
521ccb5c | 453 | mcount_adjust_32 = -1; |
ffd618fa | 454 | break; |
ed60453f RV |
455 | case EM_ARM: reltype = R_ARM_ABS32; |
456 | altmcount = "__gnu_mcount_nc"; | |
457 | break; | |
af64d2aa | 458 | case EM_AARCH64: |
2ee8a74f LB |
459 | reltype = R_AARCH64_ABS64; |
460 | make_nop = make_nop_arm64; | |
461 | rel_type_nop = R_AARCH64_NONE; | |
462 | ideal_nop = ideal_nop4_arm64; | |
463 | gpfx = '_'; | |
464 | break; | |
81d3858d | 465 | case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break; |
00512bdd JH |
466 | case EM_METAG: reltype = R_METAG_ADDR32; |
467 | altmcount = "_mcount_wrapper"; | |
468 | rel_type_nop = R_METAG_NONE; | |
469 | /* We happen to have the same requirement as MIPS */ | |
470 | is_fake_mcount32 = MIPS32_is_fake_mcount; | |
471 | break; | |
a2d49358 | 472 | case EM_MIPS: /* reltype: e_class */ gpfx = '_'; break; |
81d3858d JR |
473 | case EM_PPC: reltype = R_PPC_ADDR32; gpfx = '_'; break; |
474 | case EM_PPC64: reltype = R_PPC64_ADDR64; gpfx = '_'; break; | |
475 | case EM_S390: /* reltype: e_class */ gpfx = '_'; break; | |
476 | case EM_SH: reltype = R_SH_DIR32; break; | |
477 | case EM_SPARCV9: reltype = R_SPARC_64; gpfx = '_'; break; | |
ffd618fa SR |
478 | case EM_X86_64: |
479 | make_nop = make_nop_x86; | |
480 | ideal_nop = ideal_nop5_x86_64; | |
481 | reltype = R_X86_64_64; | |
46a2b61e | 482 | rel_type_nop = R_X86_64_NONE; |
521ccb5c | 483 | mcount_adjust_64 = -1; |
ffd618fa | 484 | break; |
81d3858d JR |
485 | } /* end switch */ |
486 | ||
487 | switch (ehdr->e_ident[EI_CLASS]) { | |
e90b0c8b | 488 | default: |
81d3858d JR |
489 | fprintf(stderr, "unrecognized ELF class %d %s\n", |
490 | ehdr->e_ident[EI_CLASS], fname); | |
491 | fail_file(); | |
e90b0c8b SR |
492 | break; |
493 | case ELFCLASS32: | |
dd5477ff SR |
494 | if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) |
495 | || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { | |
81d3858d JR |
496 | fprintf(stderr, |
497 | "unrecognized ET_REL file: %s\n", fname); | |
498 | fail_file(); | |
499 | } | |
dd5477ff | 500 | if (w2(ehdr->e_machine) == EM_MIPS) { |
a2d49358 | 501 | reltype = R_MIPS_32; |
412910cd WZ |
502 | is_fake_mcount32 = MIPS32_is_fake_mcount; |
503 | } | |
81d3858d | 504 | do32(ehdr, fname, reltype); |
e90b0c8b | 505 | break; |
81d3858d JR |
506 | case ELFCLASS64: { |
507 | Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; | |
dd5477ff SR |
508 | if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) |
509 | || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { | |
81d3858d JR |
510 | fprintf(stderr, |
511 | "unrecognized ET_REL file: %s\n", fname); | |
512 | fail_file(); | |
513 | } | |
f2963886 | 514 | if (w2(ghdr->e_machine) == EM_S390) { |
81d3858d | 515 | reltype = R_390_64; |
c933146a | 516 | mcount_adjust_64 = -14; |
f2963886 | 517 | } |
dd5477ff | 518 | if (w2(ghdr->e_machine) == EM_MIPS) { |
a2d49358 JR |
519 | reltype = R_MIPS_64; |
520 | Elf64_r_sym = MIPS64_r_sym; | |
521 | Elf64_r_info = MIPS64_r_info; | |
412910cd | 522 | is_fake_mcount64 = MIPS64_is_fake_mcount; |
a2d49358 | 523 | } |
81d3858d | 524 | do64(ghdr, fname, reltype); |
e90b0c8b SR |
525 | break; |
526 | } | |
81d3858d JR |
527 | } /* end switch */ |
528 | ||
a50bd439 | 529 | write_file(fname); |
81d3858d JR |
530 | cleanup(); |
531 | } | |
532 | ||
533 | int | |
dfad3d59 | 534 | main(int argc, char *argv[]) |
81d3858d | 535 | { |
cd3478f2 | 536 | const char ftrace[] = "/ftrace.o"; |
44475863 | 537 | int ftrace_size = sizeof(ftrace) - 1; |
81d3858d | 538 | int n_error = 0; /* gcc-4.3.0 false positive complaint */ |
dfad3d59 SR |
539 | int c; |
540 | int i; | |
44475863 | 541 | |
dfad3d59 SR |
542 | while ((c = getopt(argc, argv, "w")) >= 0) { |
543 | switch (c) { | |
544 | case 'w': | |
545 | warn_on_notrace_sect = 1; | |
546 | break; | |
547 | default: | |
548 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
549 | return 0; | |
550 | } | |
551 | } | |
552 | ||
553 | if ((argc - optind) < 1) { | |
554 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); | |
44475863 SR |
555 | return 0; |
556 | } | |
557 | ||
558 | /* Process each file in turn, allowing deep failure. */ | |
dfad3d59 SR |
559 | for (i = optind; i < argc; i++) { |
560 | char *file = argv[i]; | |
81d3858d | 561 | int const sjval = setjmp(jmpenv); |
44475863 SR |
562 | int len; |
563 | ||
564 | /* | |
565 | * The file kernel/trace/ftrace.o references the mcount | |
566 | * function but does not call it. Since ftrace.o should | |
567 | * not be traced anyway, we just skip it. | |
568 | */ | |
dfad3d59 | 569 | len = strlen(file); |
44475863 | 570 | if (len >= ftrace_size && |
dfad3d59 | 571 | strcmp(file + (len - ftrace_size), ftrace) == 0) |
44475863 SR |
572 | continue; |
573 | ||
81d3858d | 574 | switch (sjval) { |
e90b0c8b | 575 | default: |
dfad3d59 | 576 | fprintf(stderr, "internal error: %s\n", file); |
81d3858d | 577 | exit(1); |
e90b0c8b SR |
578 | break; |
579 | case SJ_SETJMP: /* normal sequence */ | |
81d3858d JR |
580 | /* Avoid problems if early cleanup() */ |
581 | fd_map = -1; | |
81d3858d | 582 | mmap_failed = 1; |
a50bd439 SRRH |
583 | file_map = NULL; |
584 | file_ptr = NULL; | |
585 | file_updated = 0; | |
dfad3d59 | 586 | do_file(file); |
e90b0c8b SR |
587 | break; |
588 | case SJ_FAIL: /* error in do_file or below */ | |
713a3e4d | 589 | fprintf(stderr, "%s: failed\n", file); |
81d3858d | 590 | ++n_error; |
e90b0c8b SR |
591 | break; |
592 | case SJ_SUCCEED: /* premature success */ | |
81d3858d | 593 | /* do nothing */ |
e90b0c8b | 594 | break; |
81d3858d JR |
595 | } /* end switch */ |
596 | } | |
597 | return !!n_error; | |
598 | } |