Merge tag 'acpi-6.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[platform/kernel/linux-starfive.git] / scripts / recordmcount.c
1 // SPDX-License-Identifier: GPL-2.0-only
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.
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>
27 #include <getopt.h>
28 #include <elf.h>
29 #include <fcntl.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #ifndef EM_AARCH64
36 #define EM_AARCH64      183
37 #define R_AARCH64_NONE          0
38 #define R_AARCH64_ABS64 257
39 #endif
40
41 #ifndef EM_LOONGARCH
42 #define EM_LOONGARCH            258
43 #define R_LARCH_32                      1
44 #define R_LARCH_64                      2
45 #define R_LARCH_MARK_LA                 20
46 #define R_LARCH_SOP_PUSH_PLT_PCREL      29
47 #endif
48
49 #define R_ARM_PC24              1
50 #define R_ARM_THM_CALL          10
51 #define R_ARM_CALL              28
52
53 #define R_AARCH64_CALL26        283
54
55 static int fd_map;      /* File descriptor for file being modified. */
56 static int mmap_failed; /* Boolean flag. */
57 static char gpfx;       /* prefix for global symbol name (sometimes '_') */
58 static struct stat sb;  /* Remember .st_size, etc. */
59 static const char *altmcount;   /* alternate mcount symbol name */
60 static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
61 static void *file_map;  /* pointer of the mapped file */
62 static void *file_end;  /* pointer to the end of the mapped file */
63 static int file_updated; /* flag to state file was changed */
64 static void *file_ptr;  /* current file pointer location */
65
66 static void *file_append; /* added to the end of the file */
67 static size_t file_append_size; /* how much is added to end of file */
68
69 /* Per-file resource cleanup when multiple files. */
70 static void file_append_cleanup(void)
71 {
72         free(file_append);
73         file_append = NULL;
74         file_append_size = 0;
75         file_updated = 0;
76 }
77
78 static void mmap_cleanup(void)
79 {
80         if (!mmap_failed)
81                 munmap(file_map, sb.st_size);
82         else
83                 free(file_map);
84         file_map = NULL;
85 }
86
87 /* ulseek, uwrite, ...:  Check return value for errors. */
88
89 static off_t ulseek(off_t const offset, int const whence)
90 {
91         switch (whence) {
92         case SEEK_SET:
93                 file_ptr = file_map + offset;
94                 break;
95         case SEEK_CUR:
96                 file_ptr += offset;
97                 break;
98         case SEEK_END:
99                 file_ptr = file_map + (sb.st_size - offset);
100                 break;
101         }
102         if (file_ptr < file_map) {
103                 fprintf(stderr, "lseek: seek before file\n");
104                 return -1;
105         }
106         return file_ptr - file_map;
107 }
108
109 static ssize_t uwrite(void const *const buf, size_t const count)
110 {
111         size_t cnt = count;
112         off_t idx = 0;
113         void *p = NULL;
114
115         file_updated = 1;
116
117         if (file_ptr + count >= file_end) {
118                 off_t aoffset = (file_ptr + count) - file_end;
119
120                 if (aoffset > file_append_size) {
121                         p = realloc(file_append, aoffset);
122                         if (!p)
123                                 free(file_append);
124                         file_append = p;
125                         file_append_size = aoffset;
126                 }
127                 if (!file_append) {
128                         perror("write");
129                         file_append_cleanup();
130                         mmap_cleanup();
131                         return -1;
132                 }
133                 if (file_ptr < file_end) {
134                         cnt = file_end - file_ptr;
135                 } else {
136                         cnt = 0;
137                         idx = aoffset - count;
138                 }
139         }
140
141         if (cnt)
142                 memcpy(file_ptr, buf, cnt);
143
144         if (cnt < count)
145                 memcpy(file_append + idx, buf + cnt, count - cnt);
146
147         file_ptr += count;
148         return count;
149 }
150
151 static void * umalloc(size_t size)
152 {
153         void *const addr = malloc(size);
154         if (addr == 0) {
155                 fprintf(stderr, "malloc failed: %zu bytes\n", size);
156                 file_append_cleanup();
157                 mmap_cleanup();
158                 return NULL;
159         }
160         return addr;
161 }
162
163 /*
164  * Get the whole file as a programming convenience in order to avoid
165  * malloc+lseek+read+free of many pieces.  If successful, then mmap
166  * avoids copying unused pieces; else just read the whole file.
167  * Open for both read and write; new info will be appended to the file.
168  * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr
169  * do not propagate to the file until an explicit overwrite at the last.
170  * This preserves most aspects of consistency (all except .st_size)
171  * for simultaneous readers of the file while we are appending to it.
172  * However, multiple writers still are bad.  We choose not to use
173  * locking because it is expensive and the use case of kernel build
174  * makes multiple writers unlikely.
175  */
176 static void *mmap_file(char const *fname)
177 {
178         /* Avoid problems if early cleanup() */
179         fd_map = -1;
180         mmap_failed = 1;
181         file_map = NULL;
182         file_ptr = NULL;
183         file_updated = 0;
184         sb.st_size = 0;
185
186         fd_map = open(fname, O_RDONLY);
187         if (fd_map < 0) {
188                 perror(fname);
189                 return NULL;
190         }
191         if (fstat(fd_map, &sb) < 0) {
192                 perror(fname);
193                 goto out;
194         }
195         if (!S_ISREG(sb.st_mode)) {
196                 fprintf(stderr, "not a regular file: %s\n", fname);
197                 goto out;
198         }
199         file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
200                         fd_map, 0);
201         if (file_map == MAP_FAILED) {
202                 mmap_failed = 1;
203                 file_map = umalloc(sb.st_size);
204                 if (!file_map) {
205                         perror(fname);
206                         goto out;
207                 }
208                 if (read(fd_map, file_map, sb.st_size) != sb.st_size) {
209                         perror(fname);
210                         free(file_map);
211                         file_map = NULL;
212                         goto out;
213                 }
214         } else
215                 mmap_failed = 0;
216 out:
217         close(fd_map);
218         fd_map = -1;
219
220         file_end = file_map + sb.st_size;
221
222         return file_map;
223 }
224
225
226 static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
227 static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 };
228 static unsigned char *ideal_nop;
229
230 static char rel_type_nop;
231
232 static int (*make_nop)(void *map, size_t const offset);
233
234 static int make_nop_x86(void *map, size_t const offset)
235 {
236         uint32_t *ptr;
237         unsigned char *op;
238
239         /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */
240         ptr = map + offset;
241         if (*ptr != 0)
242                 return -1;
243
244         op = map + offset - 1;
245         if (*op != 0xe8)
246                 return -1;
247
248         /* convert to nop */
249         if (ulseek(offset - 1, SEEK_SET) < 0)
250                 return -1;
251         if (uwrite(ideal_nop, 5) < 0)
252                 return -1;
253         return 0;
254 }
255
256 static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */
257 static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */
258 static unsigned char *ideal_nop4_arm;
259
260 static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */
261 static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */
262 static unsigned char *bl_mcount_arm;
263
264 static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */
265 static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */
266 static unsigned char *push_arm;
267
268 static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */
269 static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */
270 static unsigned char *ideal_nop2_thumb;
271
272 static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */
273 static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */
274 static unsigned char *push_bl_mcount_thumb;
275
276 static int make_nop_arm(void *map, size_t const offset)
277 {
278         char *ptr;
279         int cnt = 1;
280         int nop_size;
281         size_t off = offset;
282
283         ptr = map + offset;
284         if (memcmp(ptr, bl_mcount_arm, 4) == 0) {
285                 if (memcmp(ptr - 4, push_arm, 4) == 0) {
286                         off -= 4;
287                         cnt = 2;
288                 }
289                 ideal_nop = ideal_nop4_arm;
290                 nop_size = 4;
291         } else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) {
292                 cnt = 3;
293                 nop_size = 2;
294                 off -= 2;
295                 ideal_nop = ideal_nop2_thumb;
296         } else
297                 return -1;
298
299         /* Convert to nop */
300         if (ulseek(off, SEEK_SET) < 0)
301                 return -1;
302
303         do {
304                 if (uwrite(ideal_nop, nop_size) < 0)
305                         return -1;
306         } while (--cnt > 0);
307
308         return 0;
309 }
310
311 static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5};
312 static int make_nop_arm64(void *map, size_t const offset)
313 {
314         uint32_t *ptr;
315
316         ptr = map + offset;
317         /* bl <_mcount> is 0x94000000 before relocation */
318         if (*ptr != 0x94000000)
319                 return -1;
320
321         /* Convert to nop */
322         if (ulseek(offset, SEEK_SET) < 0)
323                 return -1;
324         if (uwrite(ideal_nop, 4) < 0)
325                 return -1;
326         return 0;
327 }
328
329 static int write_file(const char *fname)
330 {
331         char tmp_file[strlen(fname) + 4];
332         size_t n;
333
334         if (!file_updated)
335                 return 0;
336
337         sprintf(tmp_file, "%s.rc", fname);
338
339         /*
340          * After reading the entire file into memory, delete it
341          * and write it back, to prevent weird side effects of modifying
342          * an object file in place.
343          */
344         fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode);
345         if (fd_map < 0) {
346                 perror(fname);
347                 return -1;
348         }
349         n = write(fd_map, file_map, sb.st_size);
350         if (n != sb.st_size) {
351                 perror("write");
352                 close(fd_map);
353                 return -1;
354         }
355         if (file_append_size) {
356                 n = write(fd_map, file_append, file_append_size);
357                 if (n != file_append_size) {
358                         perror("write");
359                         close(fd_map);
360                         return -1;
361                 }
362         }
363         close(fd_map);
364         if (rename(tmp_file, fname) < 0) {
365                 perror(fname);
366                 return -1;
367         }
368         return 0;
369 }
370
371 /* w8rev, w8nat, ...: Handle endianness. */
372
373 static uint64_t w8rev(uint64_t const x)
374 {
375         return   ((0xff & (x >> (0 * 8))) << (7 * 8))
376                | ((0xff & (x >> (1 * 8))) << (6 * 8))
377                | ((0xff & (x >> (2 * 8))) << (5 * 8))
378                | ((0xff & (x >> (3 * 8))) << (4 * 8))
379                | ((0xff & (x >> (4 * 8))) << (3 * 8))
380                | ((0xff & (x >> (5 * 8))) << (2 * 8))
381                | ((0xff & (x >> (6 * 8))) << (1 * 8))
382                | ((0xff & (x >> (7 * 8))) << (0 * 8));
383 }
384
385 static uint32_t w4rev(uint32_t const x)
386 {
387         return   ((0xff & (x >> (0 * 8))) << (3 * 8))
388                | ((0xff & (x >> (1 * 8))) << (2 * 8))
389                | ((0xff & (x >> (2 * 8))) << (1 * 8))
390                | ((0xff & (x >> (3 * 8))) << (0 * 8));
391 }
392
393 static uint32_t w2rev(uint16_t const x)
394 {
395         return   ((0xff & (x >> (0 * 8))) << (1 * 8))
396                | ((0xff & (x >> (1 * 8))) << (0 * 8));
397 }
398
399 static uint64_t w8nat(uint64_t const x)
400 {
401         return x;
402 }
403
404 static uint32_t w4nat(uint32_t const x)
405 {
406         return x;
407 }
408
409 static uint32_t w2nat(uint16_t const x)
410 {
411         return x;
412 }
413
414 static uint64_t (*w8)(uint64_t);
415 static uint32_t (*w)(uint32_t);
416 static uint32_t (*w2)(uint16_t);
417
418 /* Names of the sections that could contain calls to mcount. */
419 static int is_mcounted_section_name(char const *const txtname)
420 {
421         return strncmp(".text",          txtname, 5) == 0 ||
422                 strcmp(".init.text",     txtname) == 0 ||
423                 strcmp(".ref.text",      txtname) == 0 ||
424                 strcmp(".sched.text",    txtname) == 0 ||
425                 strcmp(".spinlock.text", txtname) == 0 ||
426                 strcmp(".irqentry.text", txtname) == 0 ||
427                 strcmp(".softirqentry.text", txtname) == 0 ||
428                 strcmp(".kprobes.text", txtname) == 0 ||
429                 strcmp(".cpuidle.text", txtname) == 0;
430 }
431
432 static char const *already_has_rel_mcount = "success"; /* our work here is done! */
433
434 /* 32 bit and 64 bit are very similar */
435 #include "recordmcount.h"
436 #define RECORD_MCOUNT_64
437 #include "recordmcount.h"
438
439 static int arm_is_fake_mcount(Elf32_Rel const *rp)
440 {
441         switch (ELF32_R_TYPE(w(rp->r_info))) {
442         case R_ARM_THM_CALL:
443         case R_ARM_CALL:
444         case R_ARM_PC24:
445                 return 0;
446         }
447
448         return 1;
449 }
450
451 static int arm64_is_fake_mcount(Elf64_Rel const *rp)
452 {
453         return ELF64_R_TYPE(w8(rp->r_info)) != R_AARCH64_CALL26;
454 }
455
456 static int LARCH32_is_fake_mcount(Elf32_Rel const *rp)
457 {
458         switch (ELF64_R_TYPE(w(rp->r_info))) {
459         case R_LARCH_MARK_LA:
460         case R_LARCH_SOP_PUSH_PLT_PCREL:
461                 return 0;
462         }
463
464         return 1;
465 }
466
467 static int LARCH64_is_fake_mcount(Elf64_Rel const *rp)
468 {
469         switch (ELF64_R_TYPE(w(rp->r_info))) {
470         case R_LARCH_MARK_LA:
471         case R_LARCH_SOP_PUSH_PLT_PCREL:
472                 return 0;
473         }
474
475         return 1;
476 }
477
478 /* 64-bit EM_MIPS has weird ELF64_Rela.r_info.
479  * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
480  * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40]
481  * to imply the order of the members; the spec does not say so.
482  *      typedef unsigned char Elf64_Byte;
483  * fails on MIPS64 because their <elf.h> already has it!
484  */
485
486 typedef uint8_t myElf64_Byte;           /* Type for a 8-bit quantity.  */
487
488 union mips_r_info {
489         Elf64_Xword r_info;
490         struct {
491                 Elf64_Word r_sym;               /* Symbol index.  */
492                 myElf64_Byte r_ssym;            /* Special symbol.  */
493                 myElf64_Byte r_type3;           /* Third relocation.  */
494                 myElf64_Byte r_type2;           /* Second relocation.  */
495                 myElf64_Byte r_type;            /* First relocation.  */
496         } r_mips;
497 };
498
499 static uint64_t MIPS64_r_sym(Elf64_Rel const *rp)
500 {
501         return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym);
502 }
503
504 static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type)
505 {
506         rp->r_info = ((union mips_r_info){
507                 .r_mips = { .r_sym = w(sym), .r_type = type }
508         }).r_info;
509 }
510
511 static int do_file(char const *const fname)
512 {
513         unsigned int reltype = 0;
514         Elf32_Ehdr *ehdr;
515         int rc = -1;
516
517         ehdr = mmap_file(fname);
518         if (!ehdr)
519                 goto out;
520
521         w = w4nat;
522         w2 = w2nat;
523         w8 = w8nat;
524         switch (ehdr->e_ident[EI_DATA]) {
525                 static unsigned int const endian = 1;
526         default:
527                 fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
528                         ehdr->e_ident[EI_DATA], fname);
529                 goto out;
530         case ELFDATA2LSB:
531                 if (*(unsigned char const *)&endian != 1) {
532                         /* main() is big endian, file.o is little endian. */
533                         w = w4rev;
534                         w2 = w2rev;
535                         w8 = w8rev;
536                 }
537                 ideal_nop4_arm = ideal_nop4_arm_le;
538                 bl_mcount_arm = bl_mcount_arm_le;
539                 push_arm = push_arm_le;
540                 ideal_nop2_thumb = ideal_nop2_thumb_le;
541                 push_bl_mcount_thumb = push_bl_mcount_thumb_le;
542                 break;
543         case ELFDATA2MSB:
544                 if (*(unsigned char const *)&endian != 0) {
545                         /* main() is little endian, file.o is big endian. */
546                         w = w4rev;
547                         w2 = w2rev;
548                         w8 = w8rev;
549                 }
550                 ideal_nop4_arm = ideal_nop4_arm_be;
551                 bl_mcount_arm = bl_mcount_arm_be;
552                 push_arm = push_arm_be;
553                 ideal_nop2_thumb = ideal_nop2_thumb_be;
554                 push_bl_mcount_thumb = push_bl_mcount_thumb_be;
555                 break;
556         }  /* end switch */
557         if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 ||
558             w2(ehdr->e_type) != ET_REL ||
559             ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
560                 fprintf(stderr, "unrecognized ET_REL file %s\n", fname);
561                 goto out;
562         }
563
564         gpfx = '_';
565         switch (w2(ehdr->e_machine)) {
566         default:
567                 fprintf(stderr, "unrecognized e_machine %u %s\n",
568                         w2(ehdr->e_machine), fname);
569                 goto out;
570         case EM_386:
571                 reltype = R_386_32;
572                 rel_type_nop = R_386_NONE;
573                 make_nop = make_nop_x86;
574                 ideal_nop = ideal_nop5_x86_32;
575                 mcount_adjust_32 = -1;
576                 gpfx = 0;
577                 break;
578         case EM_ARM:
579                 reltype = R_ARM_ABS32;
580                 altmcount = "__gnu_mcount_nc";
581                 make_nop = make_nop_arm;
582                 rel_type_nop = R_ARM_NONE;
583                 is_fake_mcount32 = arm_is_fake_mcount;
584                 gpfx = 0;
585                 break;
586         case EM_AARCH64:
587                 reltype = R_AARCH64_ABS64;
588                 make_nop = make_nop_arm64;
589                 rel_type_nop = R_AARCH64_NONE;
590                 ideal_nop = ideal_nop4_arm64;
591                 is_fake_mcount64 = arm64_is_fake_mcount;
592                 break;
593         case EM_IA_64:  reltype = R_IA64_IMM64; break;
594         case EM_MIPS:   /* reltype: e_class    */ break;
595         case EM_LOONGARCH:      /* reltype: e_class    */ break;
596         case EM_PPC:    reltype = R_PPC_ADDR32; break;
597         case EM_PPC64:  reltype = R_PPC64_ADDR64; break;
598         case EM_S390:   /* reltype: e_class    */ break;
599         case EM_SH:     reltype = R_SH_DIR32; gpfx = 0; break;
600         case EM_SPARCV9: reltype = R_SPARC_64; break;
601         case EM_X86_64:
602                 make_nop = make_nop_x86;
603                 ideal_nop = ideal_nop5_x86_64;
604                 reltype = R_X86_64_64;
605                 rel_type_nop = R_X86_64_NONE;
606                 mcount_adjust_64 = -1;
607                 gpfx = 0;
608                 break;
609         }  /* end switch */
610
611         switch (ehdr->e_ident[EI_CLASS]) {
612         default:
613                 fprintf(stderr, "unrecognized ELF class %d %s\n",
614                         ehdr->e_ident[EI_CLASS], fname);
615                 goto out;
616         case ELFCLASS32:
617                 if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
618                 ||  w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
619                         fprintf(stderr,
620                                 "unrecognized ET_REL file: %s\n", fname);
621                         goto out;
622                 }
623                 if (w2(ehdr->e_machine) == EM_MIPS) {
624                         reltype = R_MIPS_32;
625                         is_fake_mcount32 = MIPS32_is_fake_mcount;
626                 }
627                 if (w2(ehdr->e_machine) == EM_LOONGARCH) {
628                         reltype = R_LARCH_32;
629                         is_fake_mcount32 = LARCH32_is_fake_mcount;
630                 }
631                 if (do32(ehdr, fname, reltype) < 0)
632                         goto out;
633                 break;
634         case ELFCLASS64: {
635                 Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
636                 if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr)
637                 ||  w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
638                         fprintf(stderr,
639                                 "unrecognized ET_REL file: %s\n", fname);
640                         goto out;
641                 }
642                 if (w2(ghdr->e_machine) == EM_S390) {
643                         reltype = R_390_64;
644                         mcount_adjust_64 = -14;
645                 }
646                 if (w2(ghdr->e_machine) == EM_MIPS) {
647                         reltype = R_MIPS_64;
648                         Elf64_r_sym = MIPS64_r_sym;
649                         Elf64_r_info = MIPS64_r_info;
650                         is_fake_mcount64 = MIPS64_is_fake_mcount;
651                 }
652                 if (w2(ghdr->e_machine) == EM_LOONGARCH) {
653                         reltype = R_LARCH_64;
654                         is_fake_mcount64 = LARCH64_is_fake_mcount;
655                 }
656                 if (do64(ghdr, fname, reltype) < 0)
657                         goto out;
658                 break;
659         }
660         }  /* end switch */
661
662         rc = write_file(fname);
663 out:
664         file_append_cleanup();
665         mmap_cleanup();
666         return rc;
667 }
668
669 int main(int argc, char *argv[])
670 {
671         const char ftrace[] = "/ftrace.o";
672         int ftrace_size = sizeof(ftrace) - 1;
673         int n_error = 0;  /* gcc-4.3.0 false positive complaint */
674         int c;
675         int i;
676
677         while ((c = getopt(argc, argv, "w")) >= 0) {
678                 switch (c) {
679                 case 'w':
680                         warn_on_notrace_sect = 1;
681                         break;
682                 default:
683                         fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
684                         return 0;
685                 }
686         }
687
688         if ((argc - optind) < 1) {
689                 fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
690                 return 0;
691         }
692
693         /* Process each file in turn, allowing deep failure. */
694         for (i = optind; i < argc; i++) {
695                 char *file = argv[i];
696                 int len;
697
698                 /*
699                  * The file kernel/trace/ftrace.o references the mcount
700                  * function but does not call it. Since ftrace.o should
701                  * not be traced anyway, we just skip it.
702                  */
703                 len = strlen(file);
704                 if (len >= ftrace_size &&
705                     strcmp(file + (len - ftrace_size), ftrace) == 0)
706                         continue;
707
708                 if (do_file(file)) {
709                         fprintf(stderr, "%s: failed\n", file);
710                         ++n_error;
711                 }
712         }
713         return !!n_error;
714 }