John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 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> |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 27 | #include <getopt.h> |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 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 | |
| 36 | static int fd_map; /* File descriptor for file being modified. */ |
| 37 | static int mmap_failed; /* Boolean flag. */ |
| 38 | static void *ehdr_curr; /* current ElfXX_Ehdr * for resource cleanup */ |
| 39 | static char gpfx; /* prefix for global symbol name (sometimes '_') */ |
| 40 | static struct stat sb; /* Remember .st_size, etc. */ |
| 41 | static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */ |
Rabin Vincent | ed60453 | 2010-11-30 17:36:48 +0100 | [diff] [blame] | 42 | static const char *altmcount; /* alternate mcount symbol name */ |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 43 | static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */ |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 44 | |
| 45 | /* setjmp() return values */ |
| 46 | enum { |
| 47 | SJ_SETJMP = 0, /* hardwired first return */ |
| 48 | SJ_FAIL, |
| 49 | SJ_SUCCEED |
| 50 | }; |
| 51 | |
| 52 | /* Per-file resource cleanup when multiple files. */ |
| 53 | static void |
| 54 | cleanup(void) |
| 55 | { |
| 56 | if (!mmap_failed) |
| 57 | munmap(ehdr_curr, sb.st_size); |
| 58 | else |
| 59 | free(ehdr_curr); |
| 60 | close(fd_map); |
| 61 | } |
| 62 | |
| 63 | static void __attribute__((noreturn)) |
| 64 | fail_file(void) |
| 65 | { |
| 66 | cleanup(); |
| 67 | longjmp(jmpenv, SJ_FAIL); |
| 68 | } |
| 69 | |
| 70 | static void __attribute__((noreturn)) |
| 71 | succeed_file(void) |
| 72 | { |
| 73 | cleanup(); |
| 74 | longjmp(jmpenv, SJ_SUCCEED); |
| 75 | } |
| 76 | |
| 77 | /* ulseek, uread, ...: Check return value for errors. */ |
| 78 | |
| 79 | static off_t |
| 80 | ulseek(int const fd, off_t const offset, int const whence) |
| 81 | { |
| 82 | off_t const w = lseek(fd, offset, whence); |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 83 | if (w == (off_t)-1) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 84 | perror("lseek"); |
| 85 | fail_file(); |
| 86 | } |
| 87 | return w; |
| 88 | } |
| 89 | |
| 90 | static size_t |
| 91 | uread(int const fd, void *const buf, size_t const count) |
| 92 | { |
| 93 | size_t const n = read(fd, buf, count); |
| 94 | if (n != count) { |
| 95 | perror("read"); |
| 96 | fail_file(); |
| 97 | } |
| 98 | return n; |
| 99 | } |
| 100 | |
| 101 | static size_t |
| 102 | uwrite(int const fd, void const *const buf, size_t const count) |
| 103 | { |
| 104 | size_t const n = write(fd, buf, count); |
| 105 | if (n != count) { |
| 106 | perror("write"); |
| 107 | fail_file(); |
| 108 | } |
| 109 | return n; |
| 110 | } |
| 111 | |
| 112 | static void * |
| 113 | umalloc(size_t size) |
| 114 | { |
| 115 | void *const addr = malloc(size); |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 116 | if (addr == 0) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 117 | fprintf(stderr, "malloc failed: %zu bytes\n", size); |
| 118 | fail_file(); |
| 119 | } |
| 120 | return addr; |
| 121 | } |
| 122 | |
Steven Rostedt | ffd618f | 2011-04-08 03:58:48 -0400 | [diff] [blame] | 123 | static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
| 124 | static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; |
| 125 | static unsigned char *ideal_nop; |
| 126 | |
| 127 | static char rel_type_nop; |
| 128 | |
| 129 | static int (*make_nop)(void *map, size_t const offset); |
| 130 | |
| 131 | static int make_nop_x86(void *map, size_t const offset) |
| 132 | { |
| 133 | uint32_t *ptr; |
| 134 | unsigned char *op; |
| 135 | |
| 136 | /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ |
| 137 | ptr = map + offset; |
| 138 | if (*ptr != 0) |
| 139 | return -1; |
| 140 | |
| 141 | op = map + offset - 1; |
| 142 | if (*op != 0xe8) |
| 143 | return -1; |
| 144 | |
| 145 | /* convert to nop */ |
| 146 | ulseek(fd_map, offset - 1, SEEK_SET); |
| 147 | uwrite(fd_map, ideal_nop, 5); |
| 148 | return 0; |
| 149 | } |
| 150 | |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 151 | /* |
| 152 | * Get the whole file as a programming convenience in order to avoid |
| 153 | * malloc+lseek+read+free of many pieces. If successful, then mmap |
| 154 | * avoids copying unused pieces; else just read the whole file. |
| 155 | * Open for both read and write; new info will be appended to the file. |
| 156 | * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr |
| 157 | * do not propagate to the file until an explicit overwrite at the last. |
| 158 | * This preserves most aspects of consistency (all except .st_size) |
| 159 | * for simultaneous readers of the file while we are appending to it. |
| 160 | * However, multiple writers still are bad. We choose not to use |
| 161 | * locking because it is expensive and the use case of kernel build |
| 162 | * makes multiple writers unlikely. |
| 163 | */ |
| 164 | static void *mmap_file(char const *fname) |
| 165 | { |
| 166 | void *addr; |
| 167 | |
| 168 | fd_map = open(fname, O_RDWR); |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 169 | if (fd_map < 0 || fstat(fd_map, &sb) < 0) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 170 | perror(fname); |
| 171 | fail_file(); |
| 172 | } |
| 173 | if (!S_ISREG(sb.st_mode)) { |
| 174 | fprintf(stderr, "not a regular file: %s\n", fname); |
| 175 | fail_file(); |
| 176 | } |
| 177 | addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, |
| 178 | fd_map, 0); |
| 179 | mmap_failed = 0; |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 180 | if (addr == MAP_FAILED) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 181 | mmap_failed = 1; |
| 182 | addr = umalloc(sb.st_size); |
| 183 | uread(fd_map, addr, sb.st_size); |
| 184 | } |
| 185 | return addr; |
| 186 | } |
| 187 | |
| 188 | /* w8rev, w8nat, ...: Handle endianness. */ |
| 189 | |
| 190 | static uint64_t w8rev(uint64_t const x) |
| 191 | { |
| 192 | return ((0xff & (x >> (0 * 8))) << (7 * 8)) |
| 193 | | ((0xff & (x >> (1 * 8))) << (6 * 8)) |
| 194 | | ((0xff & (x >> (2 * 8))) << (5 * 8)) |
| 195 | | ((0xff & (x >> (3 * 8))) << (4 * 8)) |
| 196 | | ((0xff & (x >> (4 * 8))) << (3 * 8)) |
| 197 | | ((0xff & (x >> (5 * 8))) << (2 * 8)) |
| 198 | | ((0xff & (x >> (6 * 8))) << (1 * 8)) |
| 199 | | ((0xff & (x >> (7 * 8))) << (0 * 8)); |
| 200 | } |
| 201 | |
| 202 | static uint32_t w4rev(uint32_t const x) |
| 203 | { |
| 204 | return ((0xff & (x >> (0 * 8))) << (3 * 8)) |
| 205 | | ((0xff & (x >> (1 * 8))) << (2 * 8)) |
| 206 | | ((0xff & (x >> (2 * 8))) << (1 * 8)) |
| 207 | | ((0xff & (x >> (3 * 8))) << (0 * 8)); |
| 208 | } |
| 209 | |
| 210 | static uint32_t w2rev(uint16_t const x) |
| 211 | { |
| 212 | return ((0xff & (x >> (0 * 8))) << (1 * 8)) |
| 213 | | ((0xff & (x >> (1 * 8))) << (0 * 8)); |
| 214 | } |
| 215 | |
| 216 | static uint64_t w8nat(uint64_t const x) |
| 217 | { |
| 218 | return x; |
| 219 | } |
| 220 | |
| 221 | static uint32_t w4nat(uint32_t const x) |
| 222 | { |
| 223 | return x; |
| 224 | } |
| 225 | |
| 226 | static uint32_t w2nat(uint16_t const x) |
| 227 | { |
| 228 | return x; |
| 229 | } |
| 230 | |
| 231 | static uint64_t (*w8)(uint64_t); |
| 232 | static uint32_t (*w)(uint32_t); |
| 233 | static uint32_t (*w2)(uint16_t); |
| 234 | |
| 235 | /* Names of the sections that could contain calls to mcount. */ |
| 236 | static int |
| 237 | is_mcounted_section_name(char const *const txtname) |
| 238 | { |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 239 | return strcmp(".text", txtname) == 0 || |
| 240 | strcmp(".ref.text", txtname) == 0 || |
| 241 | strcmp(".sched.text", txtname) == 0 || |
| 242 | strcmp(".spinlock.text", txtname) == 0 || |
| 243 | strcmp(".irqentry.text", txtname) == 0 || |
Steven Rostedt | 9f087e7 | 2011-04-06 14:10:22 -0400 | [diff] [blame] | 244 | strcmp(".kprobes.text", txtname) == 0 || |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 245 | strcmp(".text.unlikely", txtname) == 0; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 246 | } |
| 247 | |
Steven Rostedt | c28d507 | 2010-10-13 19:06:14 -0400 | [diff] [blame] | 248 | /* 32 bit and 64 bit are very similar */ |
| 249 | #include "recordmcount.h" |
| 250 | #define RECORD_MCOUNT_64 |
| 251 | #include "recordmcount.h" |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 252 | |
John Reiser | a2d4935 | 2010-10-27 18:59:07 +0800 | [diff] [blame] | 253 | /* 64-bit EM_MIPS has weird ELF64_Rela.r_info. |
| 254 | * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf |
| 255 | * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] |
| 256 | * to imply the order of the members; the spec does not say so. |
| 257 | * typedef unsigned char Elf64_Byte; |
| 258 | * fails on MIPS64 because their <elf.h> already has it! |
| 259 | */ |
| 260 | |
| 261 | typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ |
| 262 | |
| 263 | union mips_r_info { |
| 264 | Elf64_Xword r_info; |
| 265 | struct { |
| 266 | Elf64_Word r_sym; /* Symbol index. */ |
| 267 | myElf64_Byte r_ssym; /* Special symbol. */ |
| 268 | myElf64_Byte r_type3; /* Third relocation. */ |
| 269 | myElf64_Byte r_type2; /* Second relocation. */ |
| 270 | myElf64_Byte r_type; /* First relocation. */ |
| 271 | } r_mips; |
| 272 | }; |
| 273 | |
| 274 | static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) |
| 275 | { |
| 276 | return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); |
| 277 | } |
| 278 | |
| 279 | static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) |
| 280 | { |
| 281 | rp->r_info = ((union mips_r_info){ |
| 282 | .r_mips = { .r_sym = w(sym), .r_type = type } |
| 283 | }).r_info; |
| 284 | } |
| 285 | |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 286 | static void |
| 287 | do_file(char const *const fname) |
| 288 | { |
| 289 | Elf32_Ehdr *const ehdr = mmap_file(fname); |
| 290 | unsigned int reltype = 0; |
| 291 | |
| 292 | ehdr_curr = ehdr; |
| 293 | w = w4nat; |
| 294 | w2 = w2nat; |
| 295 | w8 = w8nat; |
| 296 | switch (ehdr->e_ident[EI_DATA]) { |
| 297 | static unsigned int const endian = 1; |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 298 | default: |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 299 | fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", |
| 300 | ehdr->e_ident[EI_DATA], fname); |
| 301 | fail_file(); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 302 | break; |
| 303 | case ELFDATA2LSB: |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 304 | if (*(unsigned char const *)&endian != 1) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 305 | /* main() is big endian, file.o is little endian. */ |
| 306 | w = w4rev; |
| 307 | w2 = w2rev; |
| 308 | w8 = w8rev; |
| 309 | } |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 310 | break; |
| 311 | case ELFDATA2MSB: |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 312 | if (*(unsigned char const *)&endian != 0) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 313 | /* main() is little endian, file.o is big endian. */ |
| 314 | w = w4rev; |
| 315 | w2 = w2rev; |
| 316 | w8 = w8rev; |
| 317 | } |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 318 | break; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 319 | } /* end switch */ |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 320 | if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 |
| 321 | || w2(ehdr->e_type) != ET_REL |
| 322 | || ehdr->e_ident[EI_VERSION] != EV_CURRENT) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 323 | fprintf(stderr, "unrecognized ET_REL file %s\n", fname); |
| 324 | fail_file(); |
| 325 | } |
| 326 | |
| 327 | gpfx = 0; |
| 328 | switch (w2(ehdr->e_machine)) { |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 329 | default: |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 330 | fprintf(stderr, "unrecognized e_machine %d %s\n", |
| 331 | w2(ehdr->e_machine), fname); |
| 332 | fail_file(); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 333 | break; |
Steven Rostedt | ffd618f | 2011-04-08 03:58:48 -0400 | [diff] [blame] | 334 | case EM_386: |
| 335 | reltype = R_386_32; |
| 336 | make_nop = make_nop_x86; |
| 337 | ideal_nop = ideal_nop5_x86_32; |
Martin Schwidefsky | 521ccb5 | 2011-05-10 10:10:41 +0200 | [diff] [blame^] | 338 | mcount_adjust_32 = -1; |
Steven Rostedt | ffd618f | 2011-04-08 03:58:48 -0400 | [diff] [blame] | 339 | break; |
Rabin Vincent | ed60453 | 2010-11-30 17:36:48 +0100 | [diff] [blame] | 340 | case EM_ARM: reltype = R_ARM_ABS32; |
| 341 | altmcount = "__gnu_mcount_nc"; |
| 342 | break; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 343 | case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break; |
John Reiser | a2d4935 | 2010-10-27 18:59:07 +0800 | [diff] [blame] | 344 | case EM_MIPS: /* reltype: e_class */ gpfx = '_'; break; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 345 | case EM_PPC: reltype = R_PPC_ADDR32; gpfx = '_'; break; |
| 346 | case EM_PPC64: reltype = R_PPC64_ADDR64; gpfx = '_'; break; |
| 347 | case EM_S390: /* reltype: e_class */ gpfx = '_'; break; |
| 348 | case EM_SH: reltype = R_SH_DIR32; break; |
| 349 | case EM_SPARCV9: reltype = R_SPARC_64; gpfx = '_'; break; |
Steven Rostedt | ffd618f | 2011-04-08 03:58:48 -0400 | [diff] [blame] | 350 | case EM_X86_64: |
| 351 | make_nop = make_nop_x86; |
| 352 | ideal_nop = ideal_nop5_x86_64; |
| 353 | reltype = R_X86_64_64; |
Martin Schwidefsky | 521ccb5 | 2011-05-10 10:10:41 +0200 | [diff] [blame^] | 354 | mcount_adjust_64 = -1; |
Steven Rostedt | ffd618f | 2011-04-08 03:58:48 -0400 | [diff] [blame] | 355 | break; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 356 | } /* end switch */ |
| 357 | |
| 358 | switch (ehdr->e_ident[EI_CLASS]) { |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 359 | default: |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 360 | fprintf(stderr, "unrecognized ELF class %d %s\n", |
| 361 | ehdr->e_ident[EI_CLASS], fname); |
| 362 | fail_file(); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 363 | break; |
| 364 | case ELFCLASS32: |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 365 | if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) |
| 366 | || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 367 | fprintf(stderr, |
| 368 | "unrecognized ET_REL file: %s\n", fname); |
| 369 | fail_file(); |
| 370 | } |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 371 | if (w2(ehdr->e_machine) == EM_S390) |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 372 | reltype = R_390_32; |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 373 | if (w2(ehdr->e_machine) == EM_MIPS) { |
John Reiser | a2d4935 | 2010-10-27 18:59:07 +0800 | [diff] [blame] | 374 | reltype = R_MIPS_32; |
Wu Zhangjin | 412910c | 2010-10-27 18:59:08 +0800 | [diff] [blame] | 375 | is_fake_mcount32 = MIPS32_is_fake_mcount; |
| 376 | } |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 377 | do32(ehdr, fname, reltype); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 378 | break; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 379 | case ELFCLASS64: { |
| 380 | Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 381 | if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) |
| 382 | || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 383 | fprintf(stderr, |
| 384 | "unrecognized ET_REL file: %s\n", fname); |
| 385 | fail_file(); |
| 386 | } |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 387 | if (w2(ghdr->e_machine) == EM_S390) |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 388 | reltype = R_390_64; |
Steven Rostedt | dd5477f | 2011-04-06 13:21:17 -0400 | [diff] [blame] | 389 | if (w2(ghdr->e_machine) == EM_MIPS) { |
John Reiser | a2d4935 | 2010-10-27 18:59:07 +0800 | [diff] [blame] | 390 | reltype = R_MIPS_64; |
| 391 | Elf64_r_sym = MIPS64_r_sym; |
| 392 | Elf64_r_info = MIPS64_r_info; |
Wu Zhangjin | 412910c | 2010-10-27 18:59:08 +0800 | [diff] [blame] | 393 | is_fake_mcount64 = MIPS64_is_fake_mcount; |
John Reiser | a2d4935 | 2010-10-27 18:59:07 +0800 | [diff] [blame] | 394 | } |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 395 | do64(ghdr, fname, reltype); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 396 | break; |
| 397 | } |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 398 | } /* end switch */ |
| 399 | |
| 400 | cleanup(); |
| 401 | } |
| 402 | |
| 403 | int |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 404 | main(int argc, char *argv[]) |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 405 | { |
Rabin Vincent | cd3478f | 2010-11-30 17:33:53 +0100 | [diff] [blame] | 406 | const char ftrace[] = "/ftrace.o"; |
Steven Rostedt | 4447586 | 2010-10-15 11:49:47 -0400 | [diff] [blame] | 407 | int ftrace_size = sizeof(ftrace) - 1; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 408 | int n_error = 0; /* gcc-4.3.0 false positive complaint */ |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 409 | int c; |
| 410 | int i; |
Steven Rostedt | 4447586 | 2010-10-15 11:49:47 -0400 | [diff] [blame] | 411 | |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 412 | while ((c = getopt(argc, argv, "w")) >= 0) { |
| 413 | switch (c) { |
| 414 | case 'w': |
| 415 | warn_on_notrace_sect = 1; |
| 416 | break; |
| 417 | default: |
| 418 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); |
| 419 | return 0; |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | if ((argc - optind) < 1) { |
| 424 | fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); |
Steven Rostedt | 4447586 | 2010-10-15 11:49:47 -0400 | [diff] [blame] | 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | /* Process each file in turn, allowing deep failure. */ |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 429 | for (i = optind; i < argc; i++) { |
| 430 | char *file = argv[i]; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 431 | int const sjval = setjmp(jmpenv); |
Steven Rostedt | 4447586 | 2010-10-15 11:49:47 -0400 | [diff] [blame] | 432 | int len; |
| 433 | |
| 434 | /* |
| 435 | * The file kernel/trace/ftrace.o references the mcount |
| 436 | * function but does not call it. Since ftrace.o should |
| 437 | * not be traced anyway, we just skip it. |
| 438 | */ |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 439 | len = strlen(file); |
Steven Rostedt | 4447586 | 2010-10-15 11:49:47 -0400 | [diff] [blame] | 440 | if (len >= ftrace_size && |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 441 | strcmp(file + (len - ftrace_size), ftrace) == 0) |
Steven Rostedt | 4447586 | 2010-10-15 11:49:47 -0400 | [diff] [blame] | 442 | continue; |
| 443 | |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 444 | switch (sjval) { |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 445 | default: |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 446 | fprintf(stderr, "internal error: %s\n", file); |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 447 | exit(1); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 448 | break; |
| 449 | case SJ_SETJMP: /* normal sequence */ |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 450 | /* Avoid problems if early cleanup() */ |
| 451 | fd_map = -1; |
| 452 | ehdr_curr = NULL; |
| 453 | mmap_failed = 1; |
Steven Rostedt | dfad3d5 | 2011-04-12 18:53:25 -0400 | [diff] [blame] | 454 | do_file(file); |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 455 | break; |
| 456 | case SJ_FAIL: /* error in do_file or below */ |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 457 | ++n_error; |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 458 | break; |
| 459 | case SJ_SUCCEED: /* premature success */ |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 460 | /* do nothing */ |
Steven Rostedt | e90b0c8 | 2011-04-06 13:32:24 -0400 | [diff] [blame] | 461 | break; |
John Reiser | 81d3858 | 2010-10-13 15:12:54 -0400 | [diff] [blame] | 462 | } /* end switch */ |
| 463 | } |
| 464 | return !!n_error; |
| 465 | } |
| 466 | |
| 467 | |