Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c889ba80 | 2 | /* This is included from relocs_32/64.c */ |
873b5271 | 3 | |
bf11655c KC |
4 | #define ElfW(type) _ElfW(ELF_BITS, type) |
5 | #define _ElfW(bits, type) __ElfW(bits, type) | |
6 | #define __ElfW(bits, type) Elf##bits##_##type | |
7 | ||
946166af | 8 | #define Elf_Addr ElfW(Addr) |
bf11655c KC |
9 | #define Elf_Ehdr ElfW(Ehdr) |
10 | #define Elf_Phdr ElfW(Phdr) | |
11 | #define Elf_Shdr ElfW(Shdr) | |
12 | #define Elf_Sym ElfW(Sym) | |
13 | ||
f36e7495 AS |
14 | static Elf_Ehdr ehdr; |
15 | static unsigned long shnum; | |
16 | static unsigned int shstrndx; | |
a54c401a KCA |
17 | static unsigned int shsymtabndx; |
18 | static unsigned int shxsymtabndx; | |
19 | ||
20 | static int sym_index(Elf_Sym *sym); | |
5d442e63 KC |
21 | |
22 | struct relocs { | |
23 | uint32_t *offset; | |
24 | unsigned long count; | |
25 | unsigned long size; | |
26 | }; | |
27 | ||
28 | static struct relocs relocs16; | |
29 | static struct relocs relocs32; | |
6d24c5f7 JB |
30 | #if ELF_BITS == 64 |
31 | static struct relocs relocs32neg; | |
946166af | 32 | static struct relocs relocs64; |
03dca99e BP |
33 | #define FMT PRIu64 |
34 | #else | |
35 | #define FMT PRIu32 | |
6d24c5f7 | 36 | #endif |
968de4f0 | 37 | |
908ec7af | 38 | struct section { |
bf11655c | 39 | Elf_Shdr shdr; |
908ec7af | 40 | struct section *link; |
bf11655c | 41 | Elf_Sym *symtab; |
a54c401a | 42 | Elf32_Word *xsymtab; |
bf11655c | 43 | Elf_Rel *reltab; |
908ec7af PA |
44 | char *strtab; |
45 | }; | |
46 | static struct section *secs; | |
47 | ||
6520fe55 | 48 | static const char * const sym_regex_kernel[S_NSYMTYPES] = { |
6a044b3a VG |
49 | /* |
50 | * Following symbols have been audited. There values are constant and do | |
51 | * not change if bzImage is loaded at a different physical address than | |
52 | * the address for which it has been compiled. Don't warn user about | |
53 | * absolute relocations present w.r.t these symbols. | |
54 | */ | |
6520fe55 | 55 | [S_ABS] = |
873b5271 PA |
56 | "^(xen_irq_disable_direct_reloc$|" |
57 | "xen_save_fl_direct_reloc$|" | |
58 | "VDSO|" | |
ca7e10bf | 59 | "__kcfi_typeid_|" |
6520fe55 | 60 | "__crc_)", |
6a044b3a | 61 | |
873b5271 PA |
62 | /* |
63 | * These symbols are known to be relative, even if the linker marks them | |
64 | * as absolute (typically defined outside any section in the linker script.) | |
65 | */ | |
6520fe55 | 66 | [S_REL] = |
a3e854d9 PA |
67 | "^(__init_(begin|end)|" |
68 | "__x86_cpu_dev_(start|end)|" | |
fa953adf NS |
69 | "(__parainstructions|__alt_instructions)(_end)?|" |
70 | "(__iommu_table|__apicdrivers|__smp_locks)(_end)?|" | |
fd952815 | 71 | "__(start|end)_pci_.*|" |
d6f12f83 | 72 | #if CONFIG_FW_LOADER |
fd952815 | 73 | "__(start|end)_builtin_fw|" |
c8dcf655 | 74 | #endif |
fa953adf NS |
75 | "__(start|stop)___ksymtab(_gpl)?|" |
76 | "__(start|stop)___kcrctab(_gpl)?|" | |
fd952815 PA |
77 | "__(start|stop)___param|" |
78 | "__(start|stop)___modver|" | |
79 | "__(start|stop)___bug_table|" | |
80 | "__tracedata_(start|end)|" | |
81 | "__(start|stop)_notes|" | |
82 | "__end_rodata|" | |
a29dba16 | 83 | "__end_rodata_aligned|" |
fd952815 | 84 | "__initramfs_start|" |
ea17e741 | 85 | "(jiffies|jiffies_64)|" |
c889ba80 | 86 | #if ELF_BITS == 64 |
946166af KC |
87 | "__per_cpu_load|" |
88 | "init_per_cpu__.*|" | |
89 | "__end_rodata_hpage_align|" | |
90 | #endif | |
d2312e33 | 91 | "__vvar_page|" |
a3e854d9 | 92 | "_end)$" |
6520fe55 PA |
93 | }; |
94 | ||
95 | ||
96 | static const char * const sym_regex_realmode[S_NSYMTYPES] = { | |
2a6de314 PA |
97 | /* |
98 | * These symbols are known to be relative, even if the linker marks them | |
99 | * as absolute (typically defined outside any section in the linker script.) | |
100 | */ | |
101 | [S_REL] = | |
102 | "^pa_", | |
103 | ||
6520fe55 PA |
104 | /* |
105 | * These are 16-bit segment symbols when compiling 16-bit code. | |
106 | */ | |
107 | [S_SEG] = | |
108 | "^real_mode_seg$", | |
109 | ||
110 | /* | |
111 | * These are offsets belonging to segments, as opposed to linear addresses, | |
112 | * when compiling 16-bit code. | |
113 | */ | |
114 | [S_LIN] = | |
115 | "^pa_", | |
116 | }; | |
117 | ||
118 | static const char * const *sym_regex; | |
119 | ||
120 | static regex_t sym_regex_c[S_NSYMTYPES]; | |
121 | static int is_reloc(enum symtype type, const char *sym_name) | |
6a044b3a | 122 | { |
6520fe55 PA |
123 | return sym_regex[type] && |
124 | !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0); | |
873b5271 | 125 | } |
6a044b3a | 126 | |
6520fe55 | 127 | static void regex_init(int use_real_mode) |
873b5271 PA |
128 | { |
129 | char errbuf[128]; | |
130 | int err; | |
6520fe55 | 131 | int i; |
873b5271 | 132 | |
6520fe55 PA |
133 | if (use_real_mode) |
134 | sym_regex = sym_regex_realmode; | |
135 | else | |
136 | sym_regex = sym_regex_kernel; | |
137 | ||
138 | for (i = 0; i < S_NSYMTYPES; i++) { | |
139 | if (!sym_regex[i]) | |
140 | continue; | |
141 | ||
142 | err = regcomp(&sym_regex_c[i], sym_regex[i], | |
143 | REG_EXTENDED|REG_NOSUB); | |
144 | ||
145 | if (err) { | |
0e96f31e | 146 | regerror(err, &sym_regex_c[i], errbuf, sizeof(errbuf)); |
6520fe55 PA |
147 | die("%s", errbuf); |
148 | } | |
873b5271 | 149 | } |
6a044b3a VG |
150 | } |
151 | ||
968de4f0 EB |
152 | static const char *sym_type(unsigned type) |
153 | { | |
154 | static const char *type_name[] = { | |
155 | #define SYM_TYPE(X) [X] = #X | |
156 | SYM_TYPE(STT_NOTYPE), | |
157 | SYM_TYPE(STT_OBJECT), | |
158 | SYM_TYPE(STT_FUNC), | |
159 | SYM_TYPE(STT_SECTION), | |
160 | SYM_TYPE(STT_FILE), | |
161 | SYM_TYPE(STT_COMMON), | |
162 | SYM_TYPE(STT_TLS), | |
163 | #undef SYM_TYPE | |
164 | }; | |
165 | const char *name = "unknown sym type name"; | |
ca820181 | 166 | if (type < ARRAY_SIZE(type_name)) { |
968de4f0 EB |
167 | name = type_name[type]; |
168 | } | |
169 | return name; | |
170 | } | |
171 | ||
172 | static const char *sym_bind(unsigned bind) | |
173 | { | |
174 | static const char *bind_name[] = { | |
175 | #define SYM_BIND(X) [X] = #X | |
176 | SYM_BIND(STB_LOCAL), | |
177 | SYM_BIND(STB_GLOBAL), | |
178 | SYM_BIND(STB_WEAK), | |
179 | #undef SYM_BIND | |
180 | }; | |
181 | const char *name = "unknown sym bind name"; | |
ca820181 | 182 | if (bind < ARRAY_SIZE(bind_name)) { |
968de4f0 EB |
183 | name = bind_name[bind]; |
184 | } | |
185 | return name; | |
186 | } | |
187 | ||
188 | static const char *sym_visibility(unsigned visibility) | |
189 | { | |
190 | static const char *visibility_name[] = { | |
191 | #define SYM_VISIBILITY(X) [X] = #X | |
192 | SYM_VISIBILITY(STV_DEFAULT), | |
193 | SYM_VISIBILITY(STV_INTERNAL), | |
194 | SYM_VISIBILITY(STV_HIDDEN), | |
195 | SYM_VISIBILITY(STV_PROTECTED), | |
196 | #undef SYM_VISIBILITY | |
197 | }; | |
198 | const char *name = "unknown sym visibility name"; | |
ca820181 | 199 | if (visibility < ARRAY_SIZE(visibility_name)) { |
968de4f0 EB |
200 | name = visibility_name[visibility]; |
201 | } | |
202 | return name; | |
203 | } | |
204 | ||
205 | static const char *rel_type(unsigned type) | |
206 | { | |
207 | static const char *type_name[] = { | |
208 | #define REL_TYPE(X) [X] = #X | |
c889ba80 | 209 | #if ELF_BITS == 64 |
946166af KC |
210 | REL_TYPE(R_X86_64_NONE), |
211 | REL_TYPE(R_X86_64_64), | |
b40a142b | 212 | REL_TYPE(R_X86_64_PC64), |
946166af KC |
213 | REL_TYPE(R_X86_64_PC32), |
214 | REL_TYPE(R_X86_64_GOT32), | |
215 | REL_TYPE(R_X86_64_PLT32), | |
216 | REL_TYPE(R_X86_64_COPY), | |
217 | REL_TYPE(R_X86_64_GLOB_DAT), | |
218 | REL_TYPE(R_X86_64_JUMP_SLOT), | |
219 | REL_TYPE(R_X86_64_RELATIVE), | |
220 | REL_TYPE(R_X86_64_GOTPCREL), | |
221 | REL_TYPE(R_X86_64_32), | |
222 | REL_TYPE(R_X86_64_32S), | |
223 | REL_TYPE(R_X86_64_16), | |
224 | REL_TYPE(R_X86_64_PC16), | |
225 | REL_TYPE(R_X86_64_8), | |
226 | REL_TYPE(R_X86_64_PC8), | |
227 | #else | |
968de4f0 EB |
228 | REL_TYPE(R_386_NONE), |
229 | REL_TYPE(R_386_32), | |
230 | REL_TYPE(R_386_PC32), | |
231 | REL_TYPE(R_386_GOT32), | |
232 | REL_TYPE(R_386_PLT32), | |
233 | REL_TYPE(R_386_COPY), | |
234 | REL_TYPE(R_386_GLOB_DAT), | |
235 | REL_TYPE(R_386_JMP_SLOT), | |
236 | REL_TYPE(R_386_RELATIVE), | |
237 | REL_TYPE(R_386_GOTOFF), | |
238 | REL_TYPE(R_386_GOTPC), | |
6520fe55 PA |
239 | REL_TYPE(R_386_8), |
240 | REL_TYPE(R_386_PC8), | |
241 | REL_TYPE(R_386_16), | |
242 | REL_TYPE(R_386_PC16), | |
946166af | 243 | #endif |
968de4f0 EB |
244 | #undef REL_TYPE |
245 | }; | |
246 | const char *name = "unknown type rel type name"; | |
873b5271 | 247 | if (type < ARRAY_SIZE(type_name) && type_name[type]) { |
968de4f0 EB |
248 | name = type_name[type]; |
249 | } | |
250 | return name; | |
251 | } | |
252 | ||
253 | static const char *sec_name(unsigned shndx) | |
254 | { | |
255 | const char *sec_strtab; | |
256 | const char *name; | |
f36e7495 | 257 | sec_strtab = secs[shstrndx].strtab; |
968de4f0 | 258 | name = "<noname>"; |
f36e7495 | 259 | if (shndx < shnum) { |
908ec7af | 260 | name = sec_strtab + secs[shndx].shdr.sh_name; |
968de4f0 EB |
261 | } |
262 | else if (shndx == SHN_ABS) { | |
263 | name = "ABSOLUTE"; | |
264 | } | |
265 | else if (shndx == SHN_COMMON) { | |
266 | name = "COMMON"; | |
267 | } | |
268 | return name; | |
269 | } | |
270 | ||
bf11655c | 271 | static const char *sym_name(const char *sym_strtab, Elf_Sym *sym) |
968de4f0 EB |
272 | { |
273 | const char *name; | |
274 | name = "<noname>"; | |
275 | if (sym->st_name) { | |
276 | name = sym_strtab + sym->st_name; | |
277 | } | |
278 | else { | |
a54c401a | 279 | name = sec_name(sym_index(sym)); |
968de4f0 EB |
280 | } |
281 | return name; | |
282 | } | |
283 | ||
946166af KC |
284 | static Elf_Sym *sym_lookup(const char *symname) |
285 | { | |
286 | int i; | |
f36e7495 | 287 | for (i = 0; i < shnum; i++) { |
946166af KC |
288 | struct section *sec = &secs[i]; |
289 | long nsyms; | |
290 | char *strtab; | |
291 | Elf_Sym *symtab; | |
292 | Elf_Sym *sym; | |
968de4f0 | 293 | |
946166af KC |
294 | if (sec->shdr.sh_type != SHT_SYMTAB) |
295 | continue; | |
296 | ||
297 | nsyms = sec->shdr.sh_size/sizeof(Elf_Sym); | |
298 | symtab = sec->symtab; | |
299 | strtab = sec->link->strtab; | |
300 | ||
301 | for (sym = symtab; --nsyms >= 0; sym++) { | |
302 | if (!sym->st_name) | |
303 | continue; | |
304 | if (strcmp(symname, strtab + sym->st_name) == 0) | |
305 | return sym; | |
306 | } | |
307 | } | |
308 | return 0; | |
309 | } | |
968de4f0 | 310 | |
13da9e20 | 311 | #if BYTE_ORDER == LITTLE_ENDIAN |
968de4f0 EB |
312 | #define le16_to_cpu(val) (val) |
313 | #define le32_to_cpu(val) (val) | |
946166af | 314 | #define le64_to_cpu(val) (val) |
968de4f0 | 315 | #endif |
13da9e20 | 316 | #if BYTE_ORDER == BIG_ENDIAN |
968de4f0 EB |
317 | #define le16_to_cpu(val) bswap_16(val) |
318 | #define le32_to_cpu(val) bswap_32(val) | |
946166af | 319 | #define le64_to_cpu(val) bswap_64(val) |
968de4f0 EB |
320 | #endif |
321 | ||
322 | static uint16_t elf16_to_cpu(uint16_t val) | |
323 | { | |
324 | return le16_to_cpu(val); | |
325 | } | |
326 | ||
327 | static uint32_t elf32_to_cpu(uint32_t val) | |
328 | { | |
329 | return le32_to_cpu(val); | |
330 | } | |
331 | ||
bf11655c KC |
332 | #define elf_half_to_cpu(x) elf16_to_cpu(x) |
333 | #define elf_word_to_cpu(x) elf32_to_cpu(x) | |
946166af | 334 | |
c889ba80 | 335 | #if ELF_BITS == 64 |
946166af KC |
336 | static uint64_t elf64_to_cpu(uint64_t val) |
337 | { | |
338 | return le64_to_cpu(val); | |
339 | } | |
340 | #define elf_addr_to_cpu(x) elf64_to_cpu(x) | |
341 | #define elf_off_to_cpu(x) elf64_to_cpu(x) | |
342 | #define elf_xword_to_cpu(x) elf64_to_cpu(x) | |
343 | #else | |
bf11655c KC |
344 | #define elf_addr_to_cpu(x) elf32_to_cpu(x) |
345 | #define elf_off_to_cpu(x) elf32_to_cpu(x) | |
346 | #define elf_xword_to_cpu(x) elf32_to_cpu(x) | |
946166af | 347 | #endif |
bf11655c | 348 | |
a54c401a KCA |
349 | static int sym_index(Elf_Sym *sym) |
350 | { | |
351 | Elf_Sym *symtab = secs[shsymtabndx].symtab; | |
352 | Elf32_Word *xsymtab = secs[shxsymtabndx].xsymtab; | |
353 | unsigned long offset; | |
354 | int index; | |
355 | ||
356 | if (sym->st_shndx != SHN_XINDEX) | |
357 | return sym->st_shndx; | |
358 | ||
359 | /* calculate offset of sym from head of table. */ | |
360 | offset = (unsigned long)sym - (unsigned long)symtab; | |
361 | index = offset / sizeof(*sym); | |
362 | ||
363 | return elf32_to_cpu(xsymtab[index]); | |
364 | } | |
365 | ||
968de4f0 EB |
366 | static void read_ehdr(FILE *fp) |
367 | { | |
368 | if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) { | |
369 | die("Cannot read ELF header: %s\n", | |
370 | strerror(errno)); | |
371 | } | |
8bd1796d | 372 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) { |
968de4f0 EB |
373 | die("No ELF magic\n"); |
374 | } | |
bf11655c KC |
375 | if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) { |
376 | die("Not a %d bit executable\n", ELF_BITS); | |
968de4f0 EB |
377 | } |
378 | if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) { | |
379 | die("Not a LSB ELF executable\n"); | |
380 | } | |
381 | if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) { | |
382 | die("Unknown ELF version\n"); | |
383 | } | |
384 | /* Convert the fields to native endian */ | |
bf11655c KC |
385 | ehdr.e_type = elf_half_to_cpu(ehdr.e_type); |
386 | ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine); | |
387 | ehdr.e_version = elf_word_to_cpu(ehdr.e_version); | |
388 | ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry); | |
389 | ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff); | |
390 | ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff); | |
391 | ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags); | |
392 | ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize); | |
393 | ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize); | |
394 | ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum); | |
395 | ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize); | |
396 | ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum); | |
397 | ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx); | |
968de4f0 | 398 | |
f36e7495 AS |
399 | shnum = ehdr.e_shnum; |
400 | shstrndx = ehdr.e_shstrndx; | |
401 | ||
402 | if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) | |
968de4f0 | 403 | die("Unsupported ELF header type\n"); |
f36e7495 | 404 | if (ehdr.e_machine != ELF_MACHINE) |
bf11655c | 405 | die("Not for %s\n", ELF_MACHINE_NAME); |
f36e7495 | 406 | if (ehdr.e_version != EV_CURRENT) |
968de4f0 | 407 | die("Unknown ELF version\n"); |
f36e7495 | 408 | if (ehdr.e_ehsize != sizeof(Elf_Ehdr)) |
70e79866 | 409 | die("Bad ELF header size\n"); |
f36e7495 | 410 | if (ehdr.e_phentsize != sizeof(Elf_Phdr)) |
968de4f0 | 411 | die("Bad program header entry\n"); |
f36e7495 | 412 | if (ehdr.e_shentsize != sizeof(Elf_Shdr)) |
968de4f0 | 413 | die("Bad section header entry\n"); |
f36e7495 AS |
414 | |
415 | ||
416 | if (shnum == SHN_UNDEF || shstrndx == SHN_XINDEX) { | |
417 | Elf_Shdr shdr; | |
418 | ||
419 | if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) | |
03dca99e | 420 | die("Seek to %" FMT " failed: %s\n", ehdr.e_shoff, strerror(errno)); |
f36e7495 AS |
421 | |
422 | if (fread(&shdr, sizeof(shdr), 1, fp) != 1) | |
423 | die("Cannot read initial ELF section header: %s\n", strerror(errno)); | |
424 | ||
425 | if (shnum == SHN_UNDEF) | |
426 | shnum = elf_xword_to_cpu(shdr.sh_size); | |
427 | ||
428 | if (shstrndx == SHN_XINDEX) | |
429 | shstrndx = elf_word_to_cpu(shdr.sh_link); | |
968de4f0 | 430 | } |
f36e7495 AS |
431 | |
432 | if (shstrndx >= shnum) | |
968de4f0 | 433 | die("String table index out of bounds\n"); |
968de4f0 EB |
434 | } |
435 | ||
436 | static void read_shdrs(FILE *fp) | |
437 | { | |
438 | int i; | |
bf11655c | 439 | Elf_Shdr shdr; |
908ec7af | 440 | |
f36e7495 | 441 | secs = calloc(shnum, sizeof(struct section)); |
908ec7af | 442 | if (!secs) { |
03dca99e | 443 | die("Unable to allocate %ld section headers\n", |
f36e7495 | 444 | shnum); |
968de4f0 EB |
445 | } |
446 | if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) { | |
03dca99e BP |
447 | die("Seek to %" FMT " failed: %s\n", |
448 | ehdr.e_shoff, strerror(errno)); | |
968de4f0 | 449 | } |
f36e7495 | 450 | for (i = 0; i < shnum; i++) { |
908ec7af | 451 | struct section *sec = &secs[i]; |
0e96f31e | 452 | if (fread(&shdr, sizeof(shdr), 1, fp) != 1) |
03dca99e | 453 | die("Cannot read ELF section headers %d/%ld: %s\n", |
f36e7495 | 454 | i, shnum, strerror(errno)); |
bf11655c KC |
455 | sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name); |
456 | sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type); | |
457 | sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags); | |
458 | sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr); | |
459 | sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset); | |
460 | sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size); | |
461 | sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link); | |
462 | sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info); | |
463 | sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign); | |
464 | sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize); | |
f36e7495 | 465 | if (sec->shdr.sh_link < shnum) |
908ec7af | 466 | sec->link = &secs[sec->shdr.sh_link]; |
968de4f0 EB |
467 | } |
468 | ||
469 | } | |
470 | ||
471 | static void read_strtabs(FILE *fp) | |
472 | { | |
473 | int i; | |
f36e7495 | 474 | for (i = 0; i < shnum; i++) { |
908ec7af PA |
475 | struct section *sec = &secs[i]; |
476 | if (sec->shdr.sh_type != SHT_STRTAB) { | |
968de4f0 EB |
477 | continue; |
478 | } | |
908ec7af PA |
479 | sec->strtab = malloc(sec->shdr.sh_size); |
480 | if (!sec->strtab) { | |
03dca99e BP |
481 | die("malloc of %" FMT " bytes for strtab failed\n", |
482 | sec->shdr.sh_size); | |
968de4f0 | 483 | } |
908ec7af | 484 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) { |
03dca99e BP |
485 | die("Seek to %" FMT " failed: %s\n", |
486 | sec->shdr.sh_offset, strerror(errno)); | |
968de4f0 | 487 | } |
908ec7af PA |
488 | if (fread(sec->strtab, 1, sec->shdr.sh_size, fp) |
489 | != sec->shdr.sh_size) { | |
968de4f0 EB |
490 | die("Cannot read symbol table: %s\n", |
491 | strerror(errno)); | |
492 | } | |
493 | } | |
494 | } | |
495 | ||
496 | static void read_symtabs(FILE *fp) | |
497 | { | |
498 | int i,j; | |
a54c401a | 499 | |
f36e7495 | 500 | for (i = 0; i < shnum; i++) { |
908ec7af | 501 | struct section *sec = &secs[i]; |
a54c401a KCA |
502 | int num_syms; |
503 | ||
504 | switch (sec->shdr.sh_type) { | |
505 | case SHT_SYMTAB_SHNDX: | |
506 | sec->xsymtab = malloc(sec->shdr.sh_size); | |
507 | if (!sec->xsymtab) { | |
508 | die("malloc of %" FMT " bytes for xsymtab failed\n", | |
509 | sec->shdr.sh_size); | |
510 | } | |
511 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) { | |
512 | die("Seek to %" FMT " failed: %s\n", | |
513 | sec->shdr.sh_offset, strerror(errno)); | |
514 | } | |
515 | if (fread(sec->xsymtab, 1, sec->shdr.sh_size, fp) | |
516 | != sec->shdr.sh_size) { | |
517 | die("Cannot read extended symbol table: %s\n", | |
518 | strerror(errno)); | |
519 | } | |
520 | shxsymtabndx = i; | |
521 | continue; | |
522 | ||
523 | case SHT_SYMTAB: | |
524 | num_syms = sec->shdr.sh_size / sizeof(Elf_Sym); | |
525 | ||
526 | sec->symtab = malloc(sec->shdr.sh_size); | |
527 | if (!sec->symtab) { | |
528 | die("malloc of %" FMT " bytes for symtab failed\n", | |
529 | sec->shdr.sh_size); | |
530 | } | |
531 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) { | |
532 | die("Seek to %" FMT " failed: %s\n", | |
533 | sec->shdr.sh_offset, strerror(errno)); | |
534 | } | |
535 | if (fread(sec->symtab, 1, sec->shdr.sh_size, fp) | |
536 | != sec->shdr.sh_size) { | |
537 | die("Cannot read symbol table: %s\n", | |
538 | strerror(errno)); | |
539 | } | |
540 | for (j = 0; j < num_syms; j++) { | |
541 | Elf_Sym *sym = &sec->symtab[j]; | |
542 | ||
543 | sym->st_name = elf_word_to_cpu(sym->st_name); | |
544 | sym->st_value = elf_addr_to_cpu(sym->st_value); | |
545 | sym->st_size = elf_xword_to_cpu(sym->st_size); | |
546 | sym->st_shndx = elf_half_to_cpu(sym->st_shndx); | |
547 | } | |
548 | shsymtabndx = i; | |
549 | continue; | |
550 | ||
551 | default: | |
968de4f0 | 552 | continue; |
968de4f0 EB |
553 | } |
554 | } | |
555 | } | |
556 | ||
557 | ||
558 | static void read_relocs(FILE *fp) | |
559 | { | |
560 | int i,j; | |
f36e7495 | 561 | for (i = 0; i < shnum; i++) { |
908ec7af | 562 | struct section *sec = &secs[i]; |
bf11655c | 563 | if (sec->shdr.sh_type != SHT_REL_TYPE) { |
968de4f0 EB |
564 | continue; |
565 | } | |
908ec7af PA |
566 | sec->reltab = malloc(sec->shdr.sh_size); |
567 | if (!sec->reltab) { | |
03dca99e BP |
568 | die("malloc of %" FMT " bytes for relocs failed\n", |
569 | sec->shdr.sh_size); | |
968de4f0 | 570 | } |
908ec7af | 571 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) { |
03dca99e BP |
572 | die("Seek to %" FMT " failed: %s\n", |
573 | sec->shdr.sh_offset, strerror(errno)); | |
968de4f0 | 574 | } |
908ec7af PA |
575 | if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) |
576 | != sec->shdr.sh_size) { | |
968de4f0 EB |
577 | die("Cannot read symbol table: %s\n", |
578 | strerror(errno)); | |
579 | } | |
bf11655c KC |
580 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
581 | Elf_Rel *rel = &sec->reltab[j]; | |
582 | rel->r_offset = elf_addr_to_cpu(rel->r_offset); | |
583 | rel->r_info = elf_xword_to_cpu(rel->r_info); | |
946166af KC |
584 | #if (SHT_REL_TYPE == SHT_RELA) |
585 | rel->r_addend = elf_xword_to_cpu(rel->r_addend); | |
586 | #endif | |
968de4f0 EB |
587 | } |
588 | } | |
589 | } | |
590 | ||
591 | ||
592 | static void print_absolute_symbols(void) | |
593 | { | |
594 | int i; | |
946166af KC |
595 | const char *format; |
596 | ||
c889ba80 | 597 | if (ELF_BITS == 64) |
946166af KC |
598 | format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n"; |
599 | else | |
600 | format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n"; | |
601 | ||
968de4f0 EB |
602 | printf("Absolute symbols\n"); |
603 | printf(" Num: Value Size Type Bind Visibility Name\n"); | |
f36e7495 | 604 | for (i = 0; i < shnum; i++) { |
908ec7af | 605 | struct section *sec = &secs[i]; |
968de4f0 | 606 | char *sym_strtab; |
968de4f0 | 607 | int j; |
908ec7af PA |
608 | |
609 | if (sec->shdr.sh_type != SHT_SYMTAB) { | |
968de4f0 EB |
610 | continue; |
611 | } | |
908ec7af | 612 | sym_strtab = sec->link->strtab; |
bf11655c KC |
613 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) { |
614 | Elf_Sym *sym; | |
968de4f0 | 615 | const char *name; |
908ec7af | 616 | sym = &sec->symtab[j]; |
968de4f0 EB |
617 | name = sym_name(sym_strtab, sym); |
618 | if (sym->st_shndx != SHN_ABS) { | |
619 | continue; | |
620 | } | |
946166af | 621 | printf(format, |
968de4f0 | 622 | j, sym->st_value, sym->st_size, |
bf11655c KC |
623 | sym_type(ELF_ST_TYPE(sym->st_info)), |
624 | sym_bind(ELF_ST_BIND(sym->st_info)), | |
625 | sym_visibility(ELF_ST_VISIBILITY(sym->st_other)), | |
968de4f0 EB |
626 | name); |
627 | } | |
628 | } | |
629 | printf("\n"); | |
630 | } | |
631 | ||
632 | static void print_absolute_relocs(void) | |
633 | { | |
6a044b3a | 634 | int i, printed = 0; |
946166af KC |
635 | const char *format; |
636 | ||
c889ba80 | 637 | if (ELF_BITS == 64) |
946166af KC |
638 | format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n"; |
639 | else | |
640 | format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n"; | |
6a044b3a | 641 | |
f36e7495 | 642 | for (i = 0; i < shnum; i++) { |
908ec7af PA |
643 | struct section *sec = &secs[i]; |
644 | struct section *sec_applies, *sec_symtab; | |
968de4f0 | 645 | char *sym_strtab; |
bf11655c | 646 | Elf_Sym *sh_symtab; |
968de4f0 | 647 | int j; |
bf11655c | 648 | if (sec->shdr.sh_type != SHT_REL_TYPE) { |
968de4f0 EB |
649 | continue; |
650 | } | |
908ec7af PA |
651 | sec_symtab = sec->link; |
652 | sec_applies = &secs[sec->shdr.sh_info]; | |
653 | if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) { | |
968de4f0 EB |
654 | continue; |
655 | } | |
908ec7af PA |
656 | sh_symtab = sec_symtab->symtab; |
657 | sym_strtab = sec_symtab->link->strtab; | |
bf11655c KC |
658 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
659 | Elf_Rel *rel; | |
660 | Elf_Sym *sym; | |
968de4f0 | 661 | const char *name; |
908ec7af | 662 | rel = &sec->reltab[j]; |
bf11655c | 663 | sym = &sh_symtab[ELF_R_SYM(rel->r_info)]; |
968de4f0 EB |
664 | name = sym_name(sym_strtab, sym); |
665 | if (sym->st_shndx != SHN_ABS) { | |
666 | continue; | |
667 | } | |
6a044b3a VG |
668 | |
669 | /* Absolute symbols are not relocated if bzImage is | |
670 | * loaded at a non-compiled address. Display a warning | |
671 | * to user at compile time about the absolute | |
672 | * relocations present. | |
673 | * | |
674 | * User need to audit the code to make sure | |
675 | * some symbols which should have been section | |
676 | * relative have not become absolute because of some | |
677 | * linker optimization or wrong programming usage. | |
678 | * | |
679 | * Before warning check if this absolute symbol | |
680 | * relocation is harmless. | |
681 | */ | |
6520fe55 | 682 | if (is_reloc(S_ABS, name) || is_reloc(S_REL, name)) |
6a044b3a VG |
683 | continue; |
684 | ||
685 | if (!printed) { | |
686 | printf("WARNING: Absolute relocations" | |
687 | " present\n"); | |
688 | printf("Offset Info Type Sym.Value " | |
689 | "Sym.Name\n"); | |
690 | printed = 1; | |
691 | } | |
692 | ||
946166af | 693 | printf(format, |
968de4f0 EB |
694 | rel->r_offset, |
695 | rel->r_info, | |
bf11655c | 696 | rel_type(ELF_R_TYPE(rel->r_info)), |
968de4f0 EB |
697 | sym->st_value, |
698 | name); | |
699 | } | |
700 | } | |
6a044b3a VG |
701 | |
702 | if (printed) | |
703 | printf("\n"); | |
968de4f0 EB |
704 | } |
705 | ||
5d442e63 KC |
706 | static void add_reloc(struct relocs *r, uint32_t offset) |
707 | { | |
708 | if (r->count == r->size) { | |
709 | unsigned long newsize = r->size + 50000; | |
710 | void *mem = realloc(r->offset, newsize * sizeof(r->offset[0])); | |
711 | ||
712 | if (!mem) | |
713 | die("realloc of %ld entries for relocs failed\n", | |
714 | newsize); | |
715 | r->offset = mem; | |
716 | r->size = newsize; | |
717 | } | |
718 | r->offset[r->count++] = offset; | |
719 | } | |
720 | ||
721 | static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel, | |
722 | Elf_Sym *sym, const char *symname)) | |
968de4f0 EB |
723 | { |
724 | int i; | |
725 | /* Walk through the relocations */ | |
f36e7495 | 726 | for (i = 0; i < shnum; i++) { |
968de4f0 | 727 | char *sym_strtab; |
bf11655c | 728 | Elf_Sym *sh_symtab; |
908ec7af | 729 | struct section *sec_applies, *sec_symtab; |
968de4f0 | 730 | int j; |
908ec7af PA |
731 | struct section *sec = &secs[i]; |
732 | ||
bf11655c | 733 | if (sec->shdr.sh_type != SHT_REL_TYPE) { |
968de4f0 EB |
734 | continue; |
735 | } | |
908ec7af PA |
736 | sec_symtab = sec->link; |
737 | sec_applies = &secs[sec->shdr.sh_info]; | |
738 | if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) { | |
968de4f0 EB |
739 | continue; |
740 | } | |
908ec7af | 741 | sh_symtab = sec_symtab->symtab; |
cc65f1ec | 742 | sym_strtab = sec_symtab->link->strtab; |
bf11655c | 743 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
5d442e63 KC |
744 | Elf_Rel *rel = &sec->reltab[j]; |
745 | Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)]; | |
746 | const char *symname = sym_name(sym_strtab, sym); | |
24ab82bd | 747 | |
5d442e63 KC |
748 | process(sec, rel, sym, symname); |
749 | } | |
750 | } | |
751 | } | |
752 | ||
946166af KC |
753 | /* |
754 | * The .data..percpu section is a special case for x86_64 SMP kernels. | |
755 | * It is used to initialize the actual per_cpu areas and to provide | |
756 | * definitions for the per_cpu variables that correspond to their offsets | |
757 | * within the percpu area. Since the values of all of the symbols need | |
758 | * to be offsets from the start of the per_cpu area the virtual address | |
759 | * (sh_addr) of .data..percpu is 0 in SMP kernels. | |
760 | * | |
761 | * This means that: | |
762 | * | |
763 | * Relocations that reference symbols in the per_cpu area do not | |
764 | * need further relocation (since the value is an offset relative | |
765 | * to the start of the per_cpu area that does not change). | |
766 | * | |
767 | * Relocations that apply to the per_cpu area need to have their | |
768 | * offset adjusted by by the value of __per_cpu_load to make them | |
769 | * point to the correct place in the loaded image (because the | |
770 | * virtual address of .data..percpu is 0). | |
771 | * | |
772 | * For non SMP kernels .data..percpu is linked as part of the normal | |
773 | * kernel data and does not require special treatment. | |
774 | * | |
775 | */ | |
776 | static int per_cpu_shndx = -1; | |
eeeda4cd | 777 | static Elf_Addr per_cpu_load_addr; |
946166af KC |
778 | |
779 | static void percpu_init(void) | |
780 | { | |
781 | int i; | |
f36e7495 | 782 | for (i = 0; i < shnum; i++) { |
946166af KC |
783 | ElfW(Sym) *sym; |
784 | if (strcmp(sec_name(i), ".data..percpu")) | |
785 | continue; | |
786 | ||
787 | if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */ | |
788 | return; | |
789 | ||
790 | sym = sym_lookup("__per_cpu_load"); | |
791 | if (!sym) | |
792 | die("can't find __per_cpu_load\n"); | |
793 | ||
794 | per_cpu_shndx = i; | |
795 | per_cpu_load_addr = sym->st_value; | |
796 | return; | |
797 | } | |
798 | } | |
799 | ||
c889ba80 PA |
800 | #if ELF_BITS == 64 |
801 | ||
946166af KC |
802 | /* |
803 | * Check to see if a symbol lies in the .data..percpu section. | |
d751c169 MD |
804 | * |
805 | * The linker incorrectly associates some symbols with the | |
806 | * .data..percpu section so we also need to check the symbol | |
807 | * name to make sure that we classify the symbol correctly. | |
808 | * | |
809 | * The GNU linker incorrectly associates: | |
810 | * __init_begin | |
aec58baf | 811 | * __per_cpu_load |
d751c169 MD |
812 | * |
813 | * The "gold" linker incorrectly associates: | |
e6401c13 | 814 | * init_per_cpu__fixed_percpu_data |
d751c169 | 815 | * init_per_cpu__gdt_page |
946166af KC |
816 | */ |
817 | static int is_percpu_sym(ElfW(Sym) *sym, const char *symname) | |
818 | { | |
a54c401a KCA |
819 | int shndx = sym_index(sym); |
820 | ||
821 | return (shndx == per_cpu_shndx) && | |
d751c169 | 822 | strcmp(symname, "__init_begin") && |
aec58baf | 823 | strcmp(symname, "__per_cpu_load") && |
d751c169 | 824 | strncmp(symname, "init_per_cpu_", 13); |
946166af KC |
825 | } |
826 | ||
c889ba80 | 827 | |
946166af KC |
828 | static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, |
829 | const char *symname) | |
830 | { | |
831 | unsigned r_type = ELF64_R_TYPE(rel->r_info); | |
832 | ElfW(Addr) offset = rel->r_offset; | |
833 | int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname); | |
834 | ||
835 | if (sym->st_shndx == SHN_UNDEF) | |
836 | return 0; | |
837 | ||
838 | /* | |
839 | * Adjust the offset if this reloc applies to the percpu section. | |
840 | */ | |
841 | if (sec->shdr.sh_info == per_cpu_shndx) | |
842 | offset += per_cpu_load_addr; | |
843 | ||
844 | switch (r_type) { | |
845 | case R_X86_64_NONE: | |
6d24c5f7 JB |
846 | /* NONE can be ignored. */ |
847 | break; | |
848 | ||
946166af | 849 | case R_X86_64_PC32: |
b21ebf2f | 850 | case R_X86_64_PLT32: |
946166af | 851 | /* |
6d24c5f7 JB |
852 | * PC relative relocations don't need to be adjusted unless |
853 | * referencing a percpu symbol. | |
b21ebf2f L |
854 | * |
855 | * NB: R_X86_64_PLT32 can be treated as R_X86_64_PC32. | |
946166af | 856 | */ |
6d24c5f7 JB |
857 | if (is_percpu_sym(sym, symname)) |
858 | add_reloc(&relocs32neg, offset); | |
946166af KC |
859 | break; |
860 | ||
b40a142b AB |
861 | case R_X86_64_PC64: |
862 | /* | |
863 | * Only used by jump labels | |
864 | */ | |
865 | if (is_percpu_sym(sym, symname)) | |
866 | die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n", | |
867 | symname); | |
868 | break; | |
869 | ||
946166af KC |
870 | case R_X86_64_32: |
871 | case R_X86_64_32S: | |
872 | case R_X86_64_64: | |
873 | /* | |
874 | * References to the percpu area don't need to be adjusted. | |
875 | */ | |
876 | if (is_percpu_sym(sym, symname)) | |
877 | break; | |
878 | ||
879 | if (shn_abs) { | |
880 | /* | |
881 | * Whitelisted absolute symbols do not require | |
882 | * relocation. | |
883 | */ | |
884 | if (is_reloc(S_ABS, symname)) | |
885 | break; | |
886 | ||
887 | die("Invalid absolute %s relocation: %s\n", | |
888 | rel_type(r_type), symname); | |
889 | break; | |
890 | } | |
891 | ||
892 | /* | |
893 | * Relocation offsets for 64 bit kernels are output | |
894 | * as 32 bits and sign extended back to 64 bits when | |
895 | * the relocations are processed. | |
896 | * Make sure that the offset will fit. | |
897 | */ | |
898 | if ((int32_t)offset != (int64_t)offset) | |
899 | die("Relocation offset doesn't fit in 32 bits\n"); | |
900 | ||
901 | if (r_type == R_X86_64_64) | |
902 | add_reloc(&relocs64, offset); | |
903 | else | |
904 | add_reloc(&relocs32, offset); | |
905 | break; | |
906 | ||
907 | default: | |
908 | die("Unsupported relocation type: %s (%d)\n", | |
909 | rel_type(r_type), r_type); | |
910 | break; | |
911 | } | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
c889ba80 | 916 | #else |
946166af KC |
917 | |
918 | static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, | |
919 | const char *symname) | |
5d442e63 KC |
920 | { |
921 | unsigned r_type = ELF32_R_TYPE(rel->r_info); | |
922 | int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname); | |
923 | ||
924 | switch (r_type) { | |
925 | case R_386_NONE: | |
926 | case R_386_PC32: | |
927 | case R_386_PC16: | |
928 | case R_386_PC8: | |
bb73d071 | 929 | case R_386_PLT32: |
5d442e63 | 930 | /* |
bb73d071 FS |
931 | * NONE can be ignored and PC relative relocations don't need |
932 | * to be adjusted. Because sym must be defined, R_386_PLT32 can | |
933 | * be treated the same way as R_386_PC32. | |
5d442e63 KC |
934 | */ |
935 | break; | |
936 | ||
937 | case R_386_32: | |
938 | if (shn_abs) { | |
939 | /* | |
940 | * Whitelisted absolute symbols do not require | |
941 | * relocation. | |
942 | */ | |
943 | if (is_reloc(S_ABS, symname)) | |
873b5271 | 944 | break; |
6520fe55 | 945 | |
5d442e63 KC |
946 | die("Invalid absolute %s relocation: %s\n", |
947 | rel_type(r_type), symname); | |
948 | break; | |
949 | } | |
950 | ||
951 | add_reloc(&relocs32, rel->r_offset); | |
952 | break; | |
953 | ||
954 | default: | |
955 | die("Unsupported relocation type: %s (%d)\n", | |
956 | rel_type(r_type), r_type); | |
957 | break; | |
958 | } | |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
963 | static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, | |
964 | const char *symname) | |
965 | { | |
966 | unsigned r_type = ELF32_R_TYPE(rel->r_info); | |
967 | int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname); | |
968 | ||
969 | switch (r_type) { | |
970 | case R_386_NONE: | |
971 | case R_386_PC32: | |
972 | case R_386_PC16: | |
973 | case R_386_PC8: | |
bb73d071 | 974 | case R_386_PLT32: |
5d442e63 | 975 | /* |
bb73d071 FS |
976 | * NONE can be ignored and PC relative relocations don't need |
977 | * to be adjusted. Because sym must be defined, R_386_PLT32 can | |
978 | * be treated the same way as R_386_PC32. | |
5d442e63 KC |
979 | */ |
980 | break; | |
981 | ||
982 | case R_386_16: | |
983 | if (shn_abs) { | |
984 | /* | |
985 | * Whitelisted absolute symbols do not require | |
986 | * relocation. | |
987 | */ | |
988 | if (is_reloc(S_ABS, symname)) | |
6520fe55 PA |
989 | break; |
990 | ||
5d442e63 KC |
991 | if (is_reloc(S_SEG, symname)) { |
992 | add_reloc(&relocs16, rel->r_offset); | |
993 | break; | |
994 | } | |
995 | } else { | |
996 | if (!is_reloc(S_LIN, symname)) | |
873b5271 | 997 | break; |
5d442e63 KC |
998 | } |
999 | die("Invalid %s %s relocation: %s\n", | |
1000 | shn_abs ? "absolute" : "relative", | |
1001 | rel_type(r_type), symname); | |
1002 | break; | |
1003 | ||
1004 | case R_386_32: | |
1005 | if (shn_abs) { | |
1006 | /* | |
1007 | * Whitelisted absolute symbols do not require | |
1008 | * relocation. | |
1009 | */ | |
1010 | if (is_reloc(S_ABS, symname)) | |
1011 | break; | |
1012 | ||
1013 | if (is_reloc(S_REL, symname)) { | |
1014 | add_reloc(&relocs32, rel->r_offset); | |
873b5271 | 1015 | break; |
968de4f0 | 1016 | } |
5d442e63 KC |
1017 | } else { |
1018 | if (is_reloc(S_LIN, symname)) | |
1019 | add_reloc(&relocs32, rel->r_offset); | |
1020 | break; | |
968de4f0 | 1021 | } |
5d442e63 KC |
1022 | die("Invalid %s %s relocation: %s\n", |
1023 | shn_abs ? "absolute" : "relative", | |
1024 | rel_type(r_type), symname); | |
1025 | break; | |
968de4f0 | 1026 | |
5d442e63 KC |
1027 | default: |
1028 | die("Unsupported relocation type: %s (%d)\n", | |
1029 | rel_type(r_type), r_type); | |
1030 | break; | |
1031 | } | |
968de4f0 | 1032 | |
5d442e63 | 1033 | return 0; |
968de4f0 EB |
1034 | } |
1035 | ||
c889ba80 PA |
1036 | #endif |
1037 | ||
968de4f0 EB |
1038 | static int cmp_relocs(const void *va, const void *vb) |
1039 | { | |
5d442e63 | 1040 | const uint32_t *a, *b; |
968de4f0 EB |
1041 | a = va; b = vb; |
1042 | return (*a == *b)? 0 : (*a > *b)? 1 : -1; | |
1043 | } | |
1044 | ||
5d442e63 KC |
1045 | static void sort_relocs(struct relocs *r) |
1046 | { | |
1047 | qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs); | |
1048 | } | |
1049 | ||
1050 | static int write32(uint32_t v, FILE *f) | |
6520fe55 PA |
1051 | { |
1052 | unsigned char buf[4]; | |
1053 | ||
1054 | put_unaligned_le32(v, buf); | |
1055 | return fwrite(buf, 1, 4, f) == 4 ? 0 : -1; | |
1056 | } | |
1057 | ||
5d442e63 KC |
1058 | static int write32_as_text(uint32_t v, FILE *f) |
1059 | { | |
1060 | return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1; | |
1061 | } | |
1062 | ||
6520fe55 | 1063 | static void emit_relocs(int as_text, int use_real_mode) |
968de4f0 EB |
1064 | { |
1065 | int i; | |
5d442e63 | 1066 | int (*write_reloc)(uint32_t, FILE *) = write32; |
946166af KC |
1067 | int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, |
1068 | const char *symname); | |
1069 | ||
c889ba80 PA |
1070 | #if ELF_BITS == 64 |
1071 | if (!use_real_mode) | |
946166af | 1072 | do_reloc = do_reloc64; |
c889ba80 PA |
1073 | else |
1074 | die("--realmode not valid for a 64-bit ELF file"); | |
1075 | #else | |
1076 | if (!use_real_mode) | |
946166af KC |
1077 | do_reloc = do_reloc32; |
1078 | else | |
1079 | do_reloc = do_reloc_real; | |
c889ba80 | 1080 | #endif |
6520fe55 | 1081 | |
968de4f0 | 1082 | /* Collect up the relocations */ |
946166af | 1083 | walk_relocs(do_reloc); |
6520fe55 | 1084 | |
5d442e63 | 1085 | if (relocs16.count && !use_real_mode) |
6520fe55 | 1086 | die("Segment relocations found but --realmode not specified\n"); |
968de4f0 EB |
1087 | |
1088 | /* Order the relocations for more efficient processing */ | |
5d442e63 | 1089 | sort_relocs(&relocs32); |
6d24c5f7 JB |
1090 | #if ELF_BITS == 64 |
1091 | sort_relocs(&relocs32neg); | |
946166af | 1092 | sort_relocs(&relocs64); |
7ebb9167 MT |
1093 | #else |
1094 | sort_relocs(&relocs16); | |
6d24c5f7 | 1095 | #endif |
968de4f0 EB |
1096 | |
1097 | /* Print the relocations */ | |
1098 | if (as_text) { | |
1099 | /* Print the relocations in a form suitable that | |
1100 | * gas will like. | |
1101 | */ | |
1102 | printf(".section \".data.reloc\",\"a\"\n"); | |
1103 | printf(".balign 4\n"); | |
5d442e63 | 1104 | write_reloc = write32_as_text; |
968de4f0 | 1105 | } |
6520fe55 | 1106 | |
5d442e63 KC |
1107 | if (use_real_mode) { |
1108 | write_reloc(relocs16.count, stdout); | |
1109 | for (i = 0; i < relocs16.count; i++) | |
1110 | write_reloc(relocs16.offset[i], stdout); | |
1111 | ||
1112 | write_reloc(relocs32.count, stdout); | |
1113 | for (i = 0; i < relocs32.count; i++) | |
1114 | write_reloc(relocs32.offset[i], stdout); | |
1115 | } else { | |
6d24c5f7 JB |
1116 | #if ELF_BITS == 64 |
1117 | /* Print a stop */ | |
1118 | write_reloc(0, stdout); | |
946166af | 1119 | |
6d24c5f7 JB |
1120 | /* Now print each relocation */ |
1121 | for (i = 0; i < relocs64.count; i++) | |
1122 | write_reloc(relocs64.offset[i], stdout); | |
1123 | ||
1124 | /* Print a stop */ | |
1125 | write_reloc(0, stdout); | |
1126 | ||
1127 | /* Now print each inverse 32-bit relocation */ | |
1128 | for (i = 0; i < relocs32neg.count; i++) | |
1129 | write_reloc(relocs32neg.offset[i], stdout); | |
1130 | #endif | |
946166af | 1131 | |
5d442e63 KC |
1132 | /* Print a stop */ |
1133 | write_reloc(0, stdout); | |
1134 | ||
1135 | /* Now print each relocation */ | |
1136 | for (i = 0; i < relocs32.count; i++) | |
1137 | write_reloc(relocs32.offset[i], stdout); | |
968de4f0 EB |
1138 | } |
1139 | } | |
1140 | ||
214a8876 MD |
1141 | /* |
1142 | * As an aid to debugging problems with different linkers | |
1143 | * print summary information about the relocs. | |
1144 | * Since different linkers tend to emit the sections in | |
1145 | * different orders we use the section names in the output. | |
1146 | */ | |
1147 | static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, | |
1148 | const char *symname) | |
1149 | { | |
1150 | printf("%s\t%s\t%s\t%s\n", | |
1151 | sec_name(sec->shdr.sh_info), | |
1152 | rel_type(ELF_R_TYPE(rel->r_info)), | |
1153 | symname, | |
a54c401a | 1154 | sec_name(sym_index(sym))); |
214a8876 MD |
1155 | return 0; |
1156 | } | |
1157 | ||
1158 | static void print_reloc_info(void) | |
1159 | { | |
1160 | printf("reloc section\treloc type\tsymbol\tsymbol section\n"); | |
1161 | walk_relocs(do_reloc_info); | |
1162 | } | |
1163 | ||
c889ba80 PA |
1164 | #if ELF_BITS == 64 |
1165 | # define process process_64 | |
1166 | #else | |
1167 | # define process process_32 | |
1168 | #endif | |
968de4f0 | 1169 | |
c889ba80 | 1170 | void process(FILE *fp, int use_real_mode, int as_text, |
214a8876 MD |
1171 | int show_absolute_syms, int show_absolute_relocs, |
1172 | int show_reloc_info) | |
968de4f0 | 1173 | { |
6520fe55 | 1174 | regex_init(use_real_mode); |
968de4f0 EB |
1175 | read_ehdr(fp); |
1176 | read_shdrs(fp); | |
1177 | read_strtabs(fp); | |
1178 | read_symtabs(fp); | |
1179 | read_relocs(fp); | |
c889ba80 | 1180 | if (ELF_BITS == 64) |
946166af | 1181 | percpu_init(); |
6a044b3a | 1182 | if (show_absolute_syms) { |
968de4f0 | 1183 | print_absolute_symbols(); |
c889ba80 | 1184 | return; |
6a044b3a VG |
1185 | } |
1186 | if (show_absolute_relocs) { | |
968de4f0 | 1187 | print_absolute_relocs(); |
c889ba80 | 1188 | return; |
968de4f0 | 1189 | } |
214a8876 MD |
1190 | if (show_reloc_info) { |
1191 | print_reloc_info(); | |
1192 | return; | |
1193 | } | |
6520fe55 | 1194 | emit_relocs(as_text, use_real_mode); |
968de4f0 | 1195 | } |