Commit | Line | Data |
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4317cf95 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a79f248b DD |
2 | /* |
3 | * sortextable.c: Sort the kernel's exception table | |
4 | * | |
d59a1683 | 5 | * Copyright 2011 - 2012 Cavium, Inc. |
a79f248b DD |
6 | * |
7 | * Based on code taken from recortmcount.c which is: | |
8 | * | |
9 | * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. | |
a79f248b DD |
10 | * |
11 | * Restructured to fit Linux format, as well as other updates: | |
12 | * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Strategy: alter the vmlinux file in-place. | |
17 | */ | |
18 | ||
19 | #include <sys/types.h> | |
20 | #include <sys/mman.h> | |
21 | #include <sys/stat.h> | |
22 | #include <getopt.h> | |
23 | #include <elf.h> | |
24 | #include <fcntl.h> | |
a79f248b DD |
25 | #include <stdio.h> |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <unistd.h> | |
29 | ||
d59a1683 DD |
30 | #include <tools/be_byteshift.h> |
31 | #include <tools/le_byteshift.h> | |
32 | ||
f06d19e4 VG |
33 | #ifndef EM_ARCOMPACT |
34 | #define EM_ARCOMPACT 93 | |
35 | #endif | |
36 | ||
25df8198 MF |
37 | #ifndef EM_XTENSA |
38 | #define EM_XTENSA 94 | |
39 | #endif | |
40 | ||
adace895 WD |
41 | #ifndef EM_AARCH64 |
42 | #define EM_AARCH64 183 | |
43 | #endif | |
44 | ||
372c7209 MS |
45 | #ifndef EM_MICROBLAZE |
46 | #define EM_MICROBLAZE 189 | |
47 | #endif | |
48 | ||
b3210d14 VG |
49 | #ifndef EM_ARCV2 |
50 | #define EM_ARCV2 195 | |
51 | #endif | |
52 | ||
6402e141 SZ |
53 | static uint32_t (*r)(const uint32_t *); |
54 | static uint16_t (*r2)(const uint16_t *); | |
55 | static uint64_t (*r8)(const uint64_t *); | |
56 | static void (*w)(uint32_t, uint32_t *); | |
57 | static void (*w2)(uint16_t, uint16_t *); | |
58 | static void (*w8)(uint64_t, uint64_t *); | |
59 | typedef void (*table_sort_t)(char *, int); | |
60 | ||
a79f248b DD |
61 | /* |
62 | * Get the whole file as a programming convenience in order to avoid | |
63 | * malloc+lseek+read+free of many pieces. If successful, then mmap | |
64 | * avoids copying unused pieces; else just read the whole file. | |
65 | * Open for both read and write. | |
66 | */ | |
3c47b787 | 67 | static void *mmap_file(char const *fname, size_t *size) |
a79f248b | 68 | { |
3c47b787 SZ |
69 | int fd; |
70 | struct stat sb; | |
71 | void *addr = NULL; | |
a79f248b | 72 | |
3c47b787 SZ |
73 | fd = open(fname, O_RDWR); |
74 | if (fd < 0) { | |
a79f248b | 75 | perror(fname); |
3c47b787 SZ |
76 | return NULL; |
77 | } | |
78 | if (fstat(fd, &sb) < 0) { | |
79 | perror(fname); | |
80 | goto out; | |
a79f248b DD |
81 | } |
82 | if (!S_ISREG(sb.st_mode)) { | |
83 | fprintf(stderr, "not a regular file: %s\n", fname); | |
3c47b787 | 84 | goto out; |
a79f248b | 85 | } |
6402e141 | 86 | |
3c47b787 | 87 | addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); |
a79f248b | 88 | if (addr == MAP_FAILED) { |
a79f248b | 89 | fprintf(stderr, "Could not mmap file: %s\n", fname); |
3c47b787 | 90 | goto out; |
a79f248b | 91 | } |
3c47b787 SZ |
92 | |
93 | *size = sb.st_size; | |
94 | ||
95 | out: | |
96 | close(fd); | |
a79f248b DD |
97 | return addr; |
98 | } | |
99 | ||
d59a1683 | 100 | static uint32_t rbe(const uint32_t *x) |
a79f248b | 101 | { |
d59a1683 | 102 | return get_unaligned_be32(x); |
a79f248b | 103 | } |
6402e141 | 104 | |
d59a1683 | 105 | static uint16_t r2be(const uint16_t *x) |
a79f248b | 106 | { |
d59a1683 | 107 | return get_unaligned_be16(x); |
a79f248b | 108 | } |
6402e141 SZ |
109 | |
110 | static uint64_t r8be(const uint64_t *x) | |
a79f248b | 111 | { |
6402e141 | 112 | return get_unaligned_be64(x); |
a79f248b | 113 | } |
6402e141 | 114 | |
d59a1683 DD |
115 | static uint32_t rle(const uint32_t *x) |
116 | { | |
117 | return get_unaligned_le32(x); | |
118 | } | |
6402e141 | 119 | |
d59a1683 | 120 | static uint16_t r2le(const uint16_t *x) |
a79f248b | 121 | { |
d59a1683 | 122 | return get_unaligned_le16(x); |
a79f248b DD |
123 | } |
124 | ||
6402e141 | 125 | static uint64_t r8le(const uint64_t *x) |
d59a1683 | 126 | { |
6402e141 | 127 | return get_unaligned_le64(x); |
d59a1683 | 128 | } |
6402e141 | 129 | |
d59a1683 DD |
130 | static void wbe(uint32_t val, uint32_t *x) |
131 | { | |
132 | put_unaligned_be32(val, x); | |
133 | } | |
6402e141 | 134 | |
d59a1683 DD |
135 | static void w2be(uint16_t val, uint16_t *x) |
136 | { | |
137 | put_unaligned_be16(val, x); | |
138 | } | |
6402e141 SZ |
139 | |
140 | static void w8be(uint64_t val, uint64_t *x) | |
d59a1683 | 141 | { |
6402e141 | 142 | put_unaligned_be64(val, x); |
d59a1683 | 143 | } |
6402e141 | 144 | |
d59a1683 DD |
145 | static void wle(uint32_t val, uint32_t *x) |
146 | { | |
147 | put_unaligned_le32(val, x); | |
148 | } | |
6402e141 | 149 | |
d59a1683 | 150 | static void w2le(uint16_t val, uint16_t *x) |
a79f248b | 151 | { |
d59a1683 | 152 | put_unaligned_le16(val, x); |
a79f248b DD |
153 | } |
154 | ||
6402e141 SZ |
155 | static void w8le(uint64_t val, uint64_t *x) |
156 | { | |
157 | put_unaligned_le64(val, x); | |
158 | } | |
a79f248b | 159 | |
59c36455 JI |
160 | /* |
161 | * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of | |
162 | * the way to -256..-1, to avoid conflicting with real section | |
163 | * indices. | |
164 | */ | |
165 | #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1)) | |
166 | ||
167 | static inline int is_shndx_special(unsigned int i) | |
168 | { | |
169 | return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; | |
170 | } | |
171 | ||
172 | /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ | |
173 | static inline unsigned int get_secindex(unsigned int shndx, | |
174 | unsigned int sym_offs, | |
175 | const Elf32_Word *symtab_shndx_start) | |
176 | { | |
177 | if (is_shndx_special(shndx)) | |
178 | return SPECIAL(shndx); | |
179 | if (shndx != SHN_XINDEX) | |
180 | return shndx; | |
181 | return r(&symtab_shndx_start[sym_offs]); | |
182 | } | |
183 | ||
a79f248b DD |
184 | /* 32 bit and 64 bit are very similar */ |
185 | #include "sortextable.h" | |
186 | #define SORTEXTABLE_64 | |
187 | #include "sortextable.h" | |
188 | ||
eb608fb3 | 189 | static int compare_relative_table(const void *a, const void *b) |
d59a1683 DD |
190 | { |
191 | int32_t av = (int32_t)r(a); | |
192 | int32_t bv = (int32_t)r(b); | |
193 | ||
194 | if (av < bv) | |
195 | return -1; | |
196 | if (av > bv) | |
197 | return 1; | |
198 | return 0; | |
199 | } | |
200 | ||
6402e141 | 201 | static void sort_relative_table(char *extab_image, int image_size) |
548acf19 | 202 | { |
6402e141 | 203 | int i = 0; |
548acf19 | 204 | |
6402e141 SZ |
205 | /* |
206 | * Do the same thing the runtime sort does, first normalize to | |
207 | * being relative to the start of the section. | |
208 | */ | |
548acf19 TL |
209 | while (i < image_size) { |
210 | uint32_t *loc = (uint32_t *)(extab_image + i); | |
548acf19 | 211 | w(r(loc) + i, loc); |
6402e141 | 212 | i += 4; |
548acf19 TL |
213 | } |
214 | ||
6402e141 | 215 | qsort(extab_image, image_size / 8, 8, compare_relative_table); |
548acf19 | 216 | |
6402e141 | 217 | /* Now denormalize. */ |
548acf19 TL |
218 | i = 0; |
219 | while (i < image_size) { | |
220 | uint32_t *loc = (uint32_t *)(extab_image + i); | |
548acf19 | 221 | w(r(loc) - i, loc); |
6402e141 | 222 | i += 4; |
548acf19 TL |
223 | } |
224 | } | |
225 | ||
6402e141 | 226 | static void x86_sort_relative_table(char *extab_image, int image_size) |
d59a1683 | 227 | { |
6402e141 | 228 | int i = 0; |
d59a1683 | 229 | |
d59a1683 DD |
230 | while (i < image_size) { |
231 | uint32_t *loc = (uint32_t *)(extab_image + i); | |
6402e141 | 232 | |
d59a1683 | 233 | w(r(loc) + i, loc); |
6402e141 SZ |
234 | w(r(loc + 1) + i + 4, loc + 1); |
235 | w(r(loc + 2) + i + 8, loc + 2); | |
236 | ||
237 | i += sizeof(uint32_t) * 3; | |
d59a1683 DD |
238 | } |
239 | ||
6402e141 | 240 | qsort(extab_image, image_size / 12, 12, compare_relative_table); |
d59a1683 | 241 | |
d59a1683 DD |
242 | i = 0; |
243 | while (i < image_size) { | |
244 | uint32_t *loc = (uint32_t *)(extab_image + i); | |
6402e141 | 245 | |
d59a1683 | 246 | w(r(loc) - i, loc); |
6402e141 SZ |
247 | w(r(loc + 1) - (i + 4), loc + 1); |
248 | w(r(loc + 2) - (i + 8), loc + 2); | |
249 | ||
250 | i += sizeof(uint32_t) * 3; | |
d59a1683 DD |
251 | } |
252 | } | |
a79f248b | 253 | |
6402e141 | 254 | static int do_file(char const *const fname, void *addr) |
a79f248b | 255 | { |
3c47b787 | 256 | int rc = -1; |
6402e141 SZ |
257 | Elf32_Ehdr *ehdr = addr; |
258 | table_sort_t custom_sort = NULL; | |
a79f248b | 259 | |
a79f248b | 260 | switch (ehdr->e_ident[EI_DATA]) { |
a79f248b | 261 | case ELFDATA2LSB: |
6402e141 SZ |
262 | r = rle; |
263 | r2 = r2le; | |
264 | r8 = r8le; | |
265 | w = wle; | |
266 | w2 = w2le; | |
267 | w8 = w8le; | |
a79f248b DD |
268 | break; |
269 | case ELFDATA2MSB: | |
6402e141 SZ |
270 | r = rbe; |
271 | r2 = r2be; | |
272 | r8 = r8be; | |
273 | w = wbe; | |
274 | w2 = w2be; | |
275 | w8 = w8be; | |
a79f248b | 276 | break; |
6402e141 SZ |
277 | default: |
278 | fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", | |
279 | ehdr->e_ident[EI_DATA], fname); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 || | |
284 | (r2(&ehdr->e_type) != ET_EXEC && r2(&ehdr->e_type) != ET_DYN) || | |
285 | ehdr->e_ident[EI_VERSION] != EV_CURRENT) { | |
7b957b6e | 286 | fprintf(stderr, "unrecognized ET_EXEC/ET_DYN file %s\n", fname); |
3c47b787 | 287 | return -1; |
a79f248b DD |
288 | } |
289 | ||
d59a1683 | 290 | switch (r2(&ehdr->e_machine)) { |
a79f248b | 291 | case EM_386: |
a79f248b | 292 | case EM_X86_64: |
548acf19 TL |
293 | custom_sort = x86_sort_relative_table; |
294 | break; | |
3193a98d | 295 | case EM_S390: |
6c94f27a | 296 | case EM_AARCH64: |
0de79858 | 297 | case EM_PARISC: |
5b9ff027 NP |
298 | case EM_PPC: |
299 | case EM_PPC64: | |
eb608fb3 HC |
300 | custom_sort = sort_relative_table; |
301 | break; | |
f06d19e4 | 302 | case EM_ARCOMPACT: |
b3210d14 | 303 | case EM_ARCV2: |
ee951c63 | 304 | case EM_ARM: |
372c7209 | 305 | case EM_MICROBLAZE: |
d59a1683 | 306 | case EM_MIPS: |
25df8198 | 307 | case EM_XTENSA: |
a79f248b | 308 | break; |
6402e141 SZ |
309 | default: |
310 | fprintf(stderr, "unrecognized e_machine %d %s\n", | |
311 | r2(&ehdr->e_machine), fname); | |
312 | return -1; | |
313 | } | |
a79f248b DD |
314 | |
315 | switch (ehdr->e_ident[EI_CLASS]) { | |
a79f248b | 316 | case ELFCLASS32: |
6402e141 SZ |
317 | if (r2(&ehdr->e_ehsize) != sizeof(Elf32_Ehdr) || |
318 | r2(&ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { | |
a79f248b | 319 | fprintf(stderr, |
7b957b6e | 320 | "unrecognized ET_EXEC/ET_DYN file: %s\n", fname); |
3c47b787 | 321 | break; |
a79f248b | 322 | } |
3c47b787 | 323 | rc = do32(ehdr, fname, custom_sort); |
a79f248b | 324 | break; |
6402e141 SZ |
325 | case ELFCLASS64: |
326 | { | |
a79f248b | 327 | Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; |
6402e141 SZ |
328 | if (r2(&ghdr->e_ehsize) != sizeof(Elf64_Ehdr) || |
329 | r2(&ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { | |
a79f248b | 330 | fprintf(stderr, |
6402e141 SZ |
331 | "unrecognized ET_EXEC/ET_DYN file: %s\n", |
332 | fname); | |
3c47b787 | 333 | break; |
a79f248b | 334 | } |
3c47b787 | 335 | rc = do64(ghdr, fname, custom_sort); |
6402e141 SZ |
336 | } |
337 | break; | |
338 | default: | |
339 | fprintf(stderr, "unrecognized ELF class %d %s\n", | |
340 | ehdr->e_ident[EI_CLASS], fname); | |
a79f248b DD |
341 | break; |
342 | } | |
a79f248b | 343 | |
3c47b787 | 344 | return rc; |
a79f248b DD |
345 | } |
346 | ||
6402e141 | 347 | int main(int argc, char *argv[]) |
a79f248b | 348 | { |
3c47b787 SZ |
349 | int i, n_error = 0; /* gcc-4.3.0 false positive complaint */ |
350 | size_t size = 0; | |
351 | void *addr = NULL; | |
a79f248b DD |
352 | |
353 | if (argc < 2) { | |
354 | fprintf(stderr, "usage: sortextable vmlinux...\n"); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* Process each file in turn, allowing deep failure. */ | |
359 | for (i = 1; i < argc; i++) { | |
3c47b787 SZ |
360 | addr = mmap_file(argv[i], &size); |
361 | if (!addr) { | |
362 | ++n_error; | |
363 | continue; | |
364 | } | |
a79f248b | 365 | |
3c47b787 | 366 | if (do_file(argv[i], addr)) |
a79f248b | 367 | ++n_error; |
3c47b787 SZ |
368 | |
369 | munmap(addr, size); | |
a79f248b | 370 | } |
6402e141 | 371 | |
a79f248b DD |
372 | return !!n_error; |
373 | } |