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 | ||
17608373 IM |
14 | static Elf_Ehdr ehdr; |
15 | static unsigned long shnum; | |
16 | static unsigned int shstrndx; | |
17 | static unsigned int shsymtabndx; | |
18 | static unsigned int shxsymtabndx; | |
a54c401a KCA |
19 | |
20 | static int sym_index(Elf_Sym *sym); | |
5d442e63 KC |
21 | |
22 | struct relocs { | |
17608373 IM |
23 | uint32_t *offset; |
24 | unsigned long count; | |
25 | unsigned long size; | |
5d442e63 KC |
26 | }; |
27 | ||
17608373 IM |
28 | static struct relocs relocs16; |
29 | static struct relocs relocs32; | |
30 | ||
6d24c5f7 | 31 | #if ELF_BITS == 64 |
17608373 IM |
32 | static struct relocs relocs32neg; |
33 | static struct relocs relocs64; | |
34 | # define FMT PRIu64 | |
03dca99e | 35 | #else |
17608373 | 36 | # define FMT PRIu32 |
6d24c5f7 | 37 | #endif |
968de4f0 | 38 | |
908ec7af | 39 | struct section { |
17608373 IM |
40 | Elf_Shdr shdr; |
41 | struct section *link; | |
42 | Elf_Sym *symtab; | |
43 | Elf32_Word *xsymtab; | |
44 | Elf_Rel *reltab; | |
45 | char *strtab; | |
908ec7af | 46 | }; |
17608373 | 47 | static struct section *secs; |
908ec7af | 48 | |
17608373 | 49 | static const char * const sym_regex_kernel[S_NSYMTYPES] = { |
6a044b3a VG |
50 | /* |
51 | * Following symbols have been audited. There values are constant and do | |
52 | * not change if bzImage is loaded at a different physical address than | |
53 | * the address for which it has been compiled. Don't warn user about | |
54 | * absolute relocations present w.r.t these symbols. | |
55 | */ | |
6520fe55 | 56 | [S_ABS] = |
873b5271 PA |
57 | "^(xen_irq_disable_direct_reloc$|" |
58 | "xen_save_fl_direct_reloc$|" | |
59 | "VDSO|" | |
ca7e10bf | 60 | "__kcfi_typeid_|" |
6520fe55 | 61 | "__crc_)", |
6a044b3a | 62 | |
873b5271 PA |
63 | /* |
64 | * These symbols are known to be relative, even if the linker marks them | |
65 | * as absolute (typically defined outside any section in the linker script.) | |
66 | */ | |
6520fe55 | 67 | [S_REL] = |
a3e854d9 PA |
68 | "^(__init_(begin|end)|" |
69 | "__x86_cpu_dev_(start|end)|" | |
f7af6977 | 70 | "__alt_instructions(_end)?|" |
fa953adf | 71 | "(__iommu_table|__apicdrivers|__smp_locks)(_end)?|" |
fd952815 | 72 | "__(start|end)_pci_.*|" |
d6f12f83 | 73 | #if CONFIG_FW_LOADER |
fd952815 | 74 | "__(start|end)_builtin_fw|" |
c8dcf655 | 75 | #endif |
fa953adf NS |
76 | "__(start|stop)___ksymtab(_gpl)?|" |
77 | "__(start|stop)___kcrctab(_gpl)?|" | |
fd952815 PA |
78 | "__(start|stop)___param|" |
79 | "__(start|stop)___modver|" | |
80 | "__(start|stop)___bug_table|" | |
81 | "__tracedata_(start|end)|" | |
82 | "__(start|stop)_notes|" | |
83 | "__end_rodata|" | |
a29dba16 | 84 | "__end_rodata_aligned|" |
fd952815 | 85 | "__initramfs_start|" |
ea17e741 | 86 | "(jiffies|jiffies_64)|" |
c889ba80 | 87 | #if ELF_BITS == 64 |
946166af KC |
88 | "__per_cpu_load|" |
89 | "init_per_cpu__.*|" | |
90 | "__end_rodata_hpage_align|" | |
91 | #endif | |
d2312e33 | 92 | "__vvar_page|" |
a3e854d9 | 93 | "_end)$" |
6520fe55 PA |
94 | }; |
95 | ||
96 | ||
97 | static const char * const sym_regex_realmode[S_NSYMTYPES] = { | |
2a6de314 PA |
98 | /* |
99 | * These symbols are known to be relative, even if the linker marks them | |
100 | * as absolute (typically defined outside any section in the linker script.) | |
101 | */ | |
102 | [S_REL] = | |
103 | "^pa_", | |
104 | ||
6520fe55 PA |
105 | /* |
106 | * These are 16-bit segment symbols when compiling 16-bit code. | |
107 | */ | |
108 | [S_SEG] = | |
109 | "^real_mode_seg$", | |
110 | ||
111 | /* | |
112 | * These are offsets belonging to segments, as opposed to linear addresses, | |
113 | * when compiling 16-bit code. | |
114 | */ | |
115 | [S_LIN] = | |
116 | "^pa_", | |
117 | }; | |
118 | ||
17608373 IM |
119 | static const char * const *sym_regex; |
120 | ||
121 | static regex_t sym_regex_c[S_NSYMTYPES]; | |
6520fe55 | 122 | |
6520fe55 | 123 | static int is_reloc(enum symtype type, const char *sym_name) |
6a044b3a | 124 | { |
17608373 | 125 | return sym_regex[type] && !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0); |
873b5271 | 126 | } |
6a044b3a | 127 | |
6520fe55 | 128 | static void regex_init(int use_real_mode) |
873b5271 PA |
129 | { |
130 | char errbuf[128]; | |
131 | int err; | |
6520fe55 | 132 | int i; |
873b5271 | 133 | |
6520fe55 PA |
134 | if (use_real_mode) |
135 | sym_regex = sym_regex_realmode; | |
136 | else | |
137 | sym_regex = sym_regex_kernel; | |
138 | ||
139 | for (i = 0; i < S_NSYMTYPES; i++) { | |
140 | if (!sym_regex[i]) | |
141 | continue; | |
142 | ||
17608373 | 143 | err = regcomp(&sym_regex_c[i], sym_regex[i], REG_EXTENDED|REG_NOSUB); |
6520fe55 PA |
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"; | |
17608373 IM |
166 | |
167 | if (type < ARRAY_SIZE(type_name)) | |
968de4f0 | 168 | name = type_name[type]; |
17608373 | 169 | |
968de4f0 EB |
170 | return name; |
171 | } | |
172 | ||
173 | static const char *sym_bind(unsigned bind) | |
174 | { | |
175 | static const char *bind_name[] = { | |
176 | #define SYM_BIND(X) [X] = #X | |
177 | SYM_BIND(STB_LOCAL), | |
178 | SYM_BIND(STB_GLOBAL), | |
179 | SYM_BIND(STB_WEAK), | |
180 | #undef SYM_BIND | |
181 | }; | |
182 | const char *name = "unknown sym bind name"; | |
17608373 IM |
183 | |
184 | if (bind < ARRAY_SIZE(bind_name)) | |
968de4f0 | 185 | name = bind_name[bind]; |
17608373 | 186 | |
968de4f0 EB |
187 | return name; |
188 | } | |
189 | ||
190 | static const char *sym_visibility(unsigned visibility) | |
191 | { | |
192 | static const char *visibility_name[] = { | |
193 | #define SYM_VISIBILITY(X) [X] = #X | |
194 | SYM_VISIBILITY(STV_DEFAULT), | |
195 | SYM_VISIBILITY(STV_INTERNAL), | |
196 | SYM_VISIBILITY(STV_HIDDEN), | |
197 | SYM_VISIBILITY(STV_PROTECTED), | |
198 | #undef SYM_VISIBILITY | |
199 | }; | |
200 | const char *name = "unknown sym visibility name"; | |
17608373 IM |
201 | |
202 | if (visibility < ARRAY_SIZE(visibility_name)) | |
968de4f0 | 203 | name = visibility_name[visibility]; |
17608373 | 204 | |
968de4f0 EB |
205 | return name; |
206 | } | |
207 | ||
208 | static const char *rel_type(unsigned type) | |
209 | { | |
210 | static const char *type_name[] = { | |
211 | #define REL_TYPE(X) [X] = #X | |
c889ba80 | 212 | #if ELF_BITS == 64 |
946166af KC |
213 | REL_TYPE(R_X86_64_NONE), |
214 | REL_TYPE(R_X86_64_64), | |
b40a142b | 215 | REL_TYPE(R_X86_64_PC64), |
946166af KC |
216 | REL_TYPE(R_X86_64_PC32), |
217 | REL_TYPE(R_X86_64_GOT32), | |
218 | REL_TYPE(R_X86_64_PLT32), | |
219 | REL_TYPE(R_X86_64_COPY), | |
220 | REL_TYPE(R_X86_64_GLOB_DAT), | |
221 | REL_TYPE(R_X86_64_JUMP_SLOT), | |
222 | REL_TYPE(R_X86_64_RELATIVE), | |
223 | REL_TYPE(R_X86_64_GOTPCREL), | |
224 | REL_TYPE(R_X86_64_32), | |
225 | REL_TYPE(R_X86_64_32S), | |
226 | REL_TYPE(R_X86_64_16), | |
227 | REL_TYPE(R_X86_64_PC16), | |
228 | REL_TYPE(R_X86_64_8), | |
229 | REL_TYPE(R_X86_64_PC8), | |
230 | #else | |
968de4f0 EB |
231 | REL_TYPE(R_386_NONE), |
232 | REL_TYPE(R_386_32), | |
233 | REL_TYPE(R_386_PC32), | |
234 | REL_TYPE(R_386_GOT32), | |
235 | REL_TYPE(R_386_PLT32), | |
236 | REL_TYPE(R_386_COPY), | |
237 | REL_TYPE(R_386_GLOB_DAT), | |
238 | REL_TYPE(R_386_JMP_SLOT), | |
239 | REL_TYPE(R_386_RELATIVE), | |
240 | REL_TYPE(R_386_GOTOFF), | |
241 | REL_TYPE(R_386_GOTPC), | |
6520fe55 PA |
242 | REL_TYPE(R_386_8), |
243 | REL_TYPE(R_386_PC8), | |
244 | REL_TYPE(R_386_16), | |
245 | REL_TYPE(R_386_PC16), | |
946166af | 246 | #endif |
968de4f0 EB |
247 | #undef REL_TYPE |
248 | }; | |
249 | const char *name = "unknown type rel type name"; | |
17608373 IM |
250 | |
251 | if (type < ARRAY_SIZE(type_name) && type_name[type]) | |
968de4f0 | 252 | name = type_name[type]; |
17608373 | 253 | |
968de4f0 EB |
254 | return name; |
255 | } | |
256 | ||
257 | static const char *sec_name(unsigned shndx) | |
258 | { | |
259 | const char *sec_strtab; | |
260 | const char *name; | |
f36e7495 | 261 | sec_strtab = secs[shstrndx].strtab; |
968de4f0 | 262 | name = "<noname>"; |
17608373 IM |
263 | |
264 | if (shndx < shnum) | |
908ec7af | 265 | name = sec_strtab + secs[shndx].shdr.sh_name; |
17608373 | 266 | else if (shndx == SHN_ABS) |
968de4f0 | 267 | name = "ABSOLUTE"; |
17608373 | 268 | else if (shndx == SHN_COMMON) |
968de4f0 | 269 | name = "COMMON"; |
17608373 | 270 | |
968de4f0 EB |
271 | return name; |
272 | } | |
273 | ||
bf11655c | 274 | static const char *sym_name(const char *sym_strtab, Elf_Sym *sym) |
968de4f0 EB |
275 | { |
276 | const char *name; | |
277 | name = "<noname>"; | |
17608373 IM |
278 | |
279 | if (sym->st_name) | |
968de4f0 | 280 | name = sym_strtab + sym->st_name; |
17608373 | 281 | else |
a54c401a | 282 | name = sec_name(sym_index(sym)); |
17608373 | 283 | |
968de4f0 EB |
284 | return name; |
285 | } | |
286 | ||
946166af KC |
287 | static Elf_Sym *sym_lookup(const char *symname) |
288 | { | |
289 | int i; | |
17608373 | 290 | |
f36e7495 | 291 | for (i = 0; i < shnum; i++) { |
946166af KC |
292 | struct section *sec = &secs[i]; |
293 | long nsyms; | |
294 | char *strtab; | |
295 | Elf_Sym *symtab; | |
296 | Elf_Sym *sym; | |
968de4f0 | 297 | |
946166af KC |
298 | if (sec->shdr.sh_type != SHT_SYMTAB) |
299 | continue; | |
300 | ||
301 | nsyms = sec->shdr.sh_size/sizeof(Elf_Sym); | |
302 | symtab = sec->symtab; | |
303 | strtab = sec->link->strtab; | |
304 | ||
305 | for (sym = symtab; --nsyms >= 0; sym++) { | |
306 | if (!sym->st_name) | |
307 | continue; | |
308 | if (strcmp(symname, strtab + sym->st_name) == 0) | |
309 | return sym; | |
310 | } | |
311 | } | |
312 | return 0; | |
313 | } | |
968de4f0 | 314 | |
13da9e20 | 315 | #if BYTE_ORDER == LITTLE_ENDIAN |
17608373 IM |
316 | # define le16_to_cpu(val) (val) |
317 | # define le32_to_cpu(val) (val) | |
318 | # define le64_to_cpu(val) (val) | |
968de4f0 | 319 | #endif |
17608373 | 320 | |
13da9e20 | 321 | #if BYTE_ORDER == BIG_ENDIAN |
17608373 IM |
322 | # define le16_to_cpu(val) bswap_16(val) |
323 | # define le32_to_cpu(val) bswap_32(val) | |
324 | # define le64_to_cpu(val) bswap_64(val) | |
968de4f0 EB |
325 | #endif |
326 | ||
327 | static uint16_t elf16_to_cpu(uint16_t val) | |
328 | { | |
329 | return le16_to_cpu(val); | |
330 | } | |
331 | ||
332 | static uint32_t elf32_to_cpu(uint32_t val) | |
333 | { | |
334 | return le32_to_cpu(val); | |
335 | } | |
336 | ||
bf11655c KC |
337 | #define elf_half_to_cpu(x) elf16_to_cpu(x) |
338 | #define elf_word_to_cpu(x) elf32_to_cpu(x) | |
946166af | 339 | |
c889ba80 | 340 | #if ELF_BITS == 64 |
946166af KC |
341 | static uint64_t elf64_to_cpu(uint64_t val) |
342 | { | |
343 | return le64_to_cpu(val); | |
344 | } | |
17608373 IM |
345 | # define elf_addr_to_cpu(x) elf64_to_cpu(x) |
346 | # define elf_off_to_cpu(x) elf64_to_cpu(x) | |
347 | # define elf_xword_to_cpu(x) elf64_to_cpu(x) | |
946166af | 348 | #else |
17608373 IM |
349 | # define elf_addr_to_cpu(x) elf32_to_cpu(x) |
350 | # define elf_off_to_cpu(x) elf32_to_cpu(x) | |
351 | # define elf_xword_to_cpu(x) elf32_to_cpu(x) | |
946166af | 352 | #endif |
bf11655c | 353 | |
a54c401a KCA |
354 | static int sym_index(Elf_Sym *sym) |
355 | { | |
356 | Elf_Sym *symtab = secs[shsymtabndx].symtab; | |
357 | Elf32_Word *xsymtab = secs[shxsymtabndx].xsymtab; | |
358 | unsigned long offset; | |
359 | int index; | |
360 | ||
361 | if (sym->st_shndx != SHN_XINDEX) | |
362 | return sym->st_shndx; | |
363 | ||
364 | /* calculate offset of sym from head of table. */ | |
365 | offset = (unsigned long)sym - (unsigned long)symtab; | |
366 | index = offset / sizeof(*sym); | |
367 | ||
368 | return elf32_to_cpu(xsymtab[index]); | |
369 | } | |
370 | ||
968de4f0 EB |
371 | static void read_ehdr(FILE *fp) |
372 | { | |
17608373 IM |
373 | if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) |
374 | die("Cannot read ELF header: %s\n", strerror(errno)); | |
375 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) | |
968de4f0 | 376 | die("No ELF magic\n"); |
17608373 | 377 | if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) |
bf11655c | 378 | die("Not a %d bit executable\n", ELF_BITS); |
17608373 | 379 | if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) |
968de4f0 | 380 | die("Not a LSB ELF executable\n"); |
17608373 | 381 | if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) |
968de4f0 | 382 | die("Unknown ELF version\n"); |
17608373 | 383 | |
968de4f0 | 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)); |
17608373 IM |
442 | if (!secs) |
443 | die("Unable to allocate %ld section headers\n", shnum); | |
444 | ||
445 | if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) | |
446 | die("Seek to %" FMT " failed: %s\n", ehdr.e_shoff, strerror(errno)); | |
447 | ||
f36e7495 | 448 | for (i = 0; i < shnum; i++) { |
908ec7af | 449 | struct section *sec = &secs[i]; |
17608373 | 450 | |
0e96f31e | 451 | if (fread(&shdr, sizeof(shdr), 1, fp) != 1) |
17608373 IM |
452 | die("Cannot read ELF section headers %d/%ld: %s\n", i, shnum, strerror(errno)); |
453 | ||
bf11655c KC |
454 | sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name); |
455 | sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type); | |
456 | sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags); | |
457 | sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr); | |
458 | sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset); | |
459 | sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size); | |
460 | sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link); | |
461 | sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info); | |
462 | sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign); | |
463 | sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize); | |
f36e7495 | 464 | if (sec->shdr.sh_link < shnum) |
908ec7af | 465 | sec->link = &secs[sec->shdr.sh_link]; |
968de4f0 EB |
466 | } |
467 | ||
468 | } | |
469 | ||
470 | static void read_strtabs(FILE *fp) | |
471 | { | |
472 | int i; | |
17608373 | 473 | |
f36e7495 | 474 | for (i = 0; i < shnum; i++) { |
908ec7af | 475 | struct section *sec = &secs[i]; |
17608373 IM |
476 | |
477 | if (sec->shdr.sh_type != SHT_STRTAB) | |
968de4f0 | 478 | continue; |
17608373 | 479 | |
908ec7af | 480 | sec->strtab = malloc(sec->shdr.sh_size); |
17608373 IM |
481 | if (!sec->strtab) |
482 | die("malloc of %" FMT " bytes for strtab failed\n", sec->shdr.sh_size); | |
483 | ||
484 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) | |
485 | die("Seek to %" FMT " failed: %s\n", sec->shdr.sh_offset, strerror(errno)); | |
486 | ||
487 | if (fread(sec->strtab, 1, sec->shdr.sh_size, fp) != sec->shdr.sh_size) | |
488 | die("Cannot read symbol table: %s\n", strerror(errno)); | |
968de4f0 EB |
489 | } |
490 | } | |
491 | ||
492 | static void read_symtabs(FILE *fp) | |
493 | { | |
17608373 | 494 | int i, j; |
a54c401a | 495 | |
f36e7495 | 496 | for (i = 0; i < shnum; i++) { |
908ec7af | 497 | struct section *sec = &secs[i]; |
a54c401a KCA |
498 | int num_syms; |
499 | ||
500 | switch (sec->shdr.sh_type) { | |
501 | case SHT_SYMTAB_SHNDX: | |
502 | sec->xsymtab = malloc(sec->shdr.sh_size); | |
17608373 IM |
503 | if (!sec->xsymtab) |
504 | die("malloc of %" FMT " bytes for xsymtab failed\n", sec->shdr.sh_size); | |
505 | ||
506 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) | |
507 | die("Seek to %" FMT " failed: %s\n", sec->shdr.sh_offset, strerror(errno)); | |
508 | ||
509 | if (fread(sec->xsymtab, 1, sec->shdr.sh_size, fp) != sec->shdr.sh_size) | |
510 | die("Cannot read extended symbol table: %s\n", strerror(errno)); | |
511 | ||
a54c401a KCA |
512 | shxsymtabndx = i; |
513 | continue; | |
514 | ||
515 | case SHT_SYMTAB: | |
516 | num_syms = sec->shdr.sh_size / sizeof(Elf_Sym); | |
517 | ||
518 | sec->symtab = malloc(sec->shdr.sh_size); | |
17608373 IM |
519 | if (!sec->symtab) |
520 | die("malloc of %" FMT " bytes for symtab failed\n", sec->shdr.sh_size); | |
521 | ||
522 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) | |
523 | die("Seek to %" FMT " failed: %s\n", sec->shdr.sh_offset, strerror(errno)); | |
524 | ||
525 | if (fread(sec->symtab, 1, sec->shdr.sh_size, fp) != sec->shdr.sh_size) | |
526 | die("Cannot read symbol table: %s\n", strerror(errno)); | |
527 | ||
a54c401a KCA |
528 | for (j = 0; j < num_syms; j++) { |
529 | Elf_Sym *sym = &sec->symtab[j]; | |
530 | ||
531 | sym->st_name = elf_word_to_cpu(sym->st_name); | |
532 | sym->st_value = elf_addr_to_cpu(sym->st_value); | |
533 | sym->st_size = elf_xword_to_cpu(sym->st_size); | |
534 | sym->st_shndx = elf_half_to_cpu(sym->st_shndx); | |
535 | } | |
536 | shsymtabndx = i; | |
537 | continue; | |
538 | ||
539 | default: | |
968de4f0 | 540 | continue; |
968de4f0 EB |
541 | } |
542 | } | |
543 | } | |
544 | ||
545 | ||
546 | static void read_relocs(FILE *fp) | |
547 | { | |
17608373 IM |
548 | int i, j; |
549 | ||
f36e7495 | 550 | for (i = 0; i < shnum; i++) { |
908ec7af | 551 | struct section *sec = &secs[i]; |
17608373 IM |
552 | |
553 | if (sec->shdr.sh_type != SHT_REL_TYPE) | |
968de4f0 | 554 | continue; |
17608373 | 555 | |
908ec7af | 556 | sec->reltab = malloc(sec->shdr.sh_size); |
17608373 IM |
557 | if (!sec->reltab) |
558 | die("malloc of %" FMT " bytes for relocs failed\n", sec->shdr.sh_size); | |
559 | ||
560 | if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) | |
561 | die("Seek to %" FMT " failed: %s\n", sec->shdr.sh_offset, strerror(errno)); | |
562 | ||
563 | if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) != sec->shdr.sh_size) | |
564 | die("Cannot read symbol table: %s\n", strerror(errno)); | |
565 | ||
bf11655c KC |
566 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
567 | Elf_Rel *rel = &sec->reltab[j]; | |
17608373 | 568 | |
bf11655c KC |
569 | rel->r_offset = elf_addr_to_cpu(rel->r_offset); |
570 | rel->r_info = elf_xword_to_cpu(rel->r_info); | |
946166af KC |
571 | #if (SHT_REL_TYPE == SHT_RELA) |
572 | rel->r_addend = elf_xword_to_cpu(rel->r_addend); | |
573 | #endif | |
968de4f0 EB |
574 | } |
575 | } | |
576 | } | |
577 | ||
578 | ||
579 | static void print_absolute_symbols(void) | |
580 | { | |
581 | int i; | |
946166af KC |
582 | const char *format; |
583 | ||
c889ba80 | 584 | if (ELF_BITS == 64) |
946166af KC |
585 | format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n"; |
586 | else | |
587 | format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n"; | |
588 | ||
968de4f0 EB |
589 | printf("Absolute symbols\n"); |
590 | printf(" Num: Value Size Type Bind Visibility Name\n"); | |
17608373 | 591 | |
f36e7495 | 592 | for (i = 0; i < shnum; i++) { |
908ec7af | 593 | struct section *sec = &secs[i]; |
968de4f0 | 594 | char *sym_strtab; |
968de4f0 | 595 | int j; |
908ec7af | 596 | |
17608373 | 597 | if (sec->shdr.sh_type != SHT_SYMTAB) |
968de4f0 | 598 | continue; |
17608373 | 599 | |
908ec7af | 600 | sym_strtab = sec->link->strtab; |
17608373 | 601 | |
bf11655c KC |
602 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) { |
603 | Elf_Sym *sym; | |
968de4f0 | 604 | const char *name; |
17608373 | 605 | |
908ec7af | 606 | sym = &sec->symtab[j]; |
968de4f0 | 607 | name = sym_name(sym_strtab, sym); |
17608373 IM |
608 | |
609 | if (sym->st_shndx != SHN_ABS) | |
968de4f0 | 610 | continue; |
17608373 | 611 | |
946166af | 612 | printf(format, |
968de4f0 | 613 | j, sym->st_value, sym->st_size, |
bf11655c KC |
614 | sym_type(ELF_ST_TYPE(sym->st_info)), |
615 | sym_bind(ELF_ST_BIND(sym->st_info)), | |
616 | sym_visibility(ELF_ST_VISIBILITY(sym->st_other)), | |
968de4f0 EB |
617 | name); |
618 | } | |
619 | } | |
620 | printf("\n"); | |
621 | } | |
622 | ||
623 | static void print_absolute_relocs(void) | |
624 | { | |
6a044b3a | 625 | int i, printed = 0; |
946166af KC |
626 | const char *format; |
627 | ||
c889ba80 | 628 | if (ELF_BITS == 64) |
946166af KC |
629 | format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n"; |
630 | else | |
631 | format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n"; | |
6a044b3a | 632 | |
f36e7495 | 633 | for (i = 0; i < shnum; i++) { |
908ec7af PA |
634 | struct section *sec = &secs[i]; |
635 | struct section *sec_applies, *sec_symtab; | |
968de4f0 | 636 | char *sym_strtab; |
bf11655c | 637 | Elf_Sym *sh_symtab; |
968de4f0 | 638 | int j; |
17608373 IM |
639 | |
640 | if (sec->shdr.sh_type != SHT_REL_TYPE) | |
968de4f0 | 641 | continue; |
17608373 | 642 | |
908ec7af PA |
643 | sec_symtab = sec->link; |
644 | sec_applies = &secs[sec->shdr.sh_info]; | |
17608373 | 645 | if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) |
968de4f0 | 646 | continue; |
17608373 | 647 | |
aaa87363 KC |
648 | /* |
649 | * Do not perform relocations in .notes section; any | |
650 | * values there are meant for pre-boot consumption (e.g. | |
651 | * startup_xen). | |
652 | */ | |
17608373 | 653 | if (sec_applies->shdr.sh_type == SHT_NOTE) |
aaa87363 | 654 | continue; |
17608373 | 655 | |
908ec7af PA |
656 | sh_symtab = sec_symtab->symtab; |
657 | sym_strtab = sec_symtab->link->strtab; | |
17608373 | 658 | |
bf11655c KC |
659 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
660 | Elf_Rel *rel; | |
661 | Elf_Sym *sym; | |
968de4f0 | 662 | const char *name; |
17608373 | 663 | |
908ec7af | 664 | rel = &sec->reltab[j]; |
bf11655c | 665 | sym = &sh_symtab[ELF_R_SYM(rel->r_info)]; |
968de4f0 | 666 | name = sym_name(sym_strtab, sym); |
17608373 IM |
667 | |
668 | if (sym->st_shndx != SHN_ABS) | |
968de4f0 | 669 | continue; |
6a044b3a VG |
670 | |
671 | /* Absolute symbols are not relocated if bzImage is | |
672 | * loaded at a non-compiled address. Display a warning | |
673 | * to user at compile time about the absolute | |
674 | * relocations present. | |
675 | * | |
676 | * User need to audit the code to make sure | |
677 | * some symbols which should have been section | |
678 | * relative have not become absolute because of some | |
679 | * linker optimization or wrong programming usage. | |
680 | * | |
681 | * Before warning check if this absolute symbol | |
682 | * relocation is harmless. | |
683 | */ | |
6520fe55 | 684 | if (is_reloc(S_ABS, name) || is_reloc(S_REL, name)) |
6a044b3a VG |
685 | continue; |
686 | ||
687 | if (!printed) { | |
17608373 IM |
688 | printf("WARNING: Absolute relocations present\n"); |
689 | printf("Offset Info Type Sym.Value Sym.Name\n"); | |
6a044b3a VG |
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) | |
17608373 IM |
713 | die("realloc of %ld entries for relocs failed\n", newsize); |
714 | ||
5d442e63 KC |
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; | |
17608373 | 725 | |
968de4f0 | 726 | /* Walk through the relocations */ |
f36e7495 | 727 | for (i = 0; i < shnum; i++) { |
968de4f0 | 728 | char *sym_strtab; |
bf11655c | 729 | Elf_Sym *sh_symtab; |
908ec7af | 730 | struct section *sec_applies, *sec_symtab; |
968de4f0 | 731 | int j; |
908ec7af PA |
732 | struct section *sec = &secs[i]; |
733 | ||
17608373 | 734 | if (sec->shdr.sh_type != SHT_REL_TYPE) |
968de4f0 | 735 | continue; |
17608373 | 736 | |
908ec7af PA |
737 | sec_symtab = sec->link; |
738 | sec_applies = &secs[sec->shdr.sh_info]; | |
17608373 | 739 | if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) |
968de4f0 | 740 | continue; |
76e9762d GW |
741 | |
742 | /* | |
743 | * Do not perform relocations in .notes sections; any | |
744 | * values there are meant for pre-boot consumption (e.g. | |
745 | * startup_xen). | |
746 | */ | |
747 | if (sec_applies->shdr.sh_type == SHT_NOTE) | |
748 | continue; | |
749 | ||
908ec7af | 750 | sh_symtab = sec_symtab->symtab; |
cc65f1ec | 751 | sym_strtab = sec_symtab->link->strtab; |
17608373 | 752 | |
bf11655c | 753 | for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
5d442e63 KC |
754 | Elf_Rel *rel = &sec->reltab[j]; |
755 | Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)]; | |
756 | const char *symname = sym_name(sym_strtab, sym); | |
24ab82bd | 757 | |
5d442e63 KC |
758 | process(sec, rel, sym, symname); |
759 | } | |
760 | } | |
761 | } | |
762 | ||
946166af KC |
763 | /* |
764 | * The .data..percpu section is a special case for x86_64 SMP kernels. | |
765 | * It is used to initialize the actual per_cpu areas and to provide | |
766 | * definitions for the per_cpu variables that correspond to their offsets | |
767 | * within the percpu area. Since the values of all of the symbols need | |
768 | * to be offsets from the start of the per_cpu area the virtual address | |
769 | * (sh_addr) of .data..percpu is 0 in SMP kernels. | |
770 | * | |
771 | * This means that: | |
772 | * | |
773 | * Relocations that reference symbols in the per_cpu area do not | |
774 | * need further relocation (since the value is an offset relative | |
775 | * to the start of the per_cpu area that does not change). | |
776 | * | |
777 | * Relocations that apply to the per_cpu area need to have their | |
778 | * offset adjusted by by the value of __per_cpu_load to make them | |
779 | * point to the correct place in the loaded image (because the | |
780 | * virtual address of .data..percpu is 0). | |
781 | * | |
782 | * For non SMP kernels .data..percpu is linked as part of the normal | |
783 | * kernel data and does not require special treatment. | |
784 | * | |
785 | */ | |
17608373 | 786 | static int per_cpu_shndx = -1; |
eeeda4cd | 787 | static Elf_Addr per_cpu_load_addr; |
946166af KC |
788 | |
789 | static void percpu_init(void) | |
790 | { | |
791 | int i; | |
17608373 | 792 | |
f36e7495 | 793 | for (i = 0; i < shnum; i++) { |
946166af | 794 | ElfW(Sym) *sym; |
17608373 | 795 | |
946166af KC |
796 | if (strcmp(sec_name(i), ".data..percpu")) |
797 | continue; | |
798 | ||
799 | if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */ | |
800 | return; | |
801 | ||
802 | sym = sym_lookup("__per_cpu_load"); | |
803 | if (!sym) | |
804 | die("can't find __per_cpu_load\n"); | |
805 | ||
806 | per_cpu_shndx = i; | |
807 | per_cpu_load_addr = sym->st_value; | |
17608373 | 808 | |
946166af KC |
809 | return; |
810 | } | |
811 | } | |
812 | ||
c889ba80 PA |
813 | #if ELF_BITS == 64 |
814 | ||
946166af KC |
815 | /* |
816 | * Check to see if a symbol lies in the .data..percpu section. | |
d751c169 MD |
817 | * |
818 | * The linker incorrectly associates some symbols with the | |
819 | * .data..percpu section so we also need to check the symbol | |
820 | * name to make sure that we classify the symbol correctly. | |
821 | * | |
822 | * The GNU linker incorrectly associates: | |
823 | * __init_begin | |
aec58baf | 824 | * __per_cpu_load |
d751c169 MD |
825 | * |
826 | * The "gold" linker incorrectly associates: | |
e6401c13 | 827 | * init_per_cpu__fixed_percpu_data |
d751c169 | 828 | * init_per_cpu__gdt_page |
946166af KC |
829 | */ |
830 | static int is_percpu_sym(ElfW(Sym) *sym, const char *symname) | |
831 | { | |
a54c401a KCA |
832 | int shndx = sym_index(sym); |
833 | ||
834 | return (shndx == per_cpu_shndx) && | |
d751c169 | 835 | strcmp(symname, "__init_begin") && |
aec58baf | 836 | strcmp(symname, "__per_cpu_load") && |
d751c169 | 837 | strncmp(symname, "init_per_cpu_", 13); |
946166af KC |
838 | } |
839 | ||
c889ba80 | 840 | |
946166af KC |
841 | static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, |
842 | const char *symname) | |
843 | { | |
844 | unsigned r_type = ELF64_R_TYPE(rel->r_info); | |
845 | ElfW(Addr) offset = rel->r_offset; | |
846 | int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname); | |
847 | ||
848 | if (sym->st_shndx == SHN_UNDEF) | |
849 | return 0; | |
850 | ||
851 | /* | |
852 | * Adjust the offset if this reloc applies to the percpu section. | |
853 | */ | |
854 | if (sec->shdr.sh_info == per_cpu_shndx) | |
855 | offset += per_cpu_load_addr; | |
856 | ||
857 | switch (r_type) { | |
858 | case R_X86_64_NONE: | |
6d24c5f7 JB |
859 | /* NONE can be ignored. */ |
860 | break; | |
861 | ||
946166af | 862 | case R_X86_64_PC32: |
b21ebf2f | 863 | case R_X86_64_PLT32: |
946166af | 864 | /* |
6d24c5f7 JB |
865 | * PC relative relocations don't need to be adjusted unless |
866 | * referencing a percpu symbol. | |
b21ebf2f L |
867 | * |
868 | * NB: R_X86_64_PLT32 can be treated as R_X86_64_PC32. | |
946166af | 869 | */ |
6d24c5f7 JB |
870 | if (is_percpu_sym(sym, symname)) |
871 | add_reloc(&relocs32neg, offset); | |
946166af KC |
872 | break; |
873 | ||
b40a142b AB |
874 | case R_X86_64_PC64: |
875 | /* | |
876 | * Only used by jump labels | |
877 | */ | |
878 | if (is_percpu_sym(sym, symname)) | |
17608373 | 879 | die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n", symname); |
b40a142b AB |
880 | break; |
881 | ||
946166af KC |
882 | case R_X86_64_32: |
883 | case R_X86_64_32S: | |
884 | case R_X86_64_64: | |
885 | /* | |
886 | * References to the percpu area don't need to be adjusted. | |
887 | */ | |
888 | if (is_percpu_sym(sym, symname)) | |
889 | break; | |
890 | ||
891 | if (shn_abs) { | |
892 | /* | |
893 | * Whitelisted absolute symbols do not require | |
894 | * relocation. | |
895 | */ | |
896 | if (is_reloc(S_ABS, symname)) | |
897 | break; | |
898 | ||
17608373 | 899 | die("Invalid absolute %s relocation: %s\n", rel_type(r_type), symname); |
946166af KC |
900 | break; |
901 | } | |
902 | ||
903 | /* | |
904 | * Relocation offsets for 64 bit kernels are output | |
905 | * as 32 bits and sign extended back to 64 bits when | |
906 | * the relocations are processed. | |
907 | * Make sure that the offset will fit. | |
908 | */ | |
909 | if ((int32_t)offset != (int64_t)offset) | |
910 | die("Relocation offset doesn't fit in 32 bits\n"); | |
911 | ||
912 | if (r_type == R_X86_64_64) | |
913 | add_reloc(&relocs64, offset); | |
914 | else | |
915 | add_reloc(&relocs32, offset); | |
916 | break; | |
917 | ||
918 | default: | |
17608373 | 919 | die("Unsupported relocation type: %s (%d)\n", rel_type(r_type), r_type); |
946166af KC |
920 | break; |
921 | } | |
922 | ||
923 | return 0; | |
924 | } | |
925 | ||
c889ba80 | 926 | #else |
946166af KC |
927 | |
928 | static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, | |
929 | const char *symname) | |
5d442e63 KC |
930 | { |
931 | unsigned r_type = ELF32_R_TYPE(rel->r_info); | |
932 | int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname); | |
933 | ||
934 | switch (r_type) { | |
935 | case R_386_NONE: | |
936 | case R_386_PC32: | |
937 | case R_386_PC16: | |
938 | case R_386_PC8: | |
bb73d071 | 939 | case R_386_PLT32: |
5d442e63 | 940 | /* |
bb73d071 FS |
941 | * NONE can be ignored and PC relative relocations don't need |
942 | * to be adjusted. Because sym must be defined, R_386_PLT32 can | |
943 | * be treated the same way as R_386_PC32. | |
5d442e63 KC |
944 | */ |
945 | break; | |
946 | ||
947 | case R_386_32: | |
948 | if (shn_abs) { | |
949 | /* | |
950 | * Whitelisted absolute symbols do not require | |
951 | * relocation. | |
952 | */ | |
953 | if (is_reloc(S_ABS, symname)) | |
873b5271 | 954 | break; |
6520fe55 | 955 | |
17608373 | 956 | die("Invalid absolute %s relocation: %s\n", rel_type(r_type), symname); |
5d442e63 KC |
957 | break; |
958 | } | |
959 | ||
960 | add_reloc(&relocs32, rel->r_offset); | |
961 | break; | |
962 | ||
963 | default: | |
17608373 | 964 | die("Unsupported relocation type: %s (%d)\n", rel_type(r_type), r_type); |
5d442e63 KC |
965 | break; |
966 | } | |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
17608373 | 971 | static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, const char *symname) |
5d442e63 KC |
972 | { |
973 | unsigned r_type = ELF32_R_TYPE(rel->r_info); | |
974 | int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname); | |
975 | ||
976 | switch (r_type) { | |
977 | case R_386_NONE: | |
978 | case R_386_PC32: | |
979 | case R_386_PC16: | |
980 | case R_386_PC8: | |
bb73d071 | 981 | case R_386_PLT32: |
5d442e63 | 982 | /* |
bb73d071 FS |
983 | * NONE can be ignored and PC relative relocations don't need |
984 | * to be adjusted. Because sym must be defined, R_386_PLT32 can | |
985 | * be treated the same way as R_386_PC32. | |
5d442e63 KC |
986 | */ |
987 | break; | |
988 | ||
989 | case R_386_16: | |
990 | if (shn_abs) { | |
991 | /* | |
992 | * Whitelisted absolute symbols do not require | |
993 | * relocation. | |
994 | */ | |
995 | if (is_reloc(S_ABS, symname)) | |
6520fe55 PA |
996 | break; |
997 | ||
5d442e63 KC |
998 | if (is_reloc(S_SEG, symname)) { |
999 | add_reloc(&relocs16, rel->r_offset); | |
1000 | break; | |
1001 | } | |
1002 | } else { | |
1003 | if (!is_reloc(S_LIN, symname)) | |
873b5271 | 1004 | break; |
5d442e63 | 1005 | } |
17608373 | 1006 | die("Invalid %s %s relocation: %s\n", shn_abs ? "absolute" : "relative", rel_type(r_type), symname); |
5d442e63 KC |
1007 | break; |
1008 | ||
1009 | case R_386_32: | |
1010 | if (shn_abs) { | |
1011 | /* | |
1012 | * Whitelisted absolute symbols do not require | |
1013 | * relocation. | |
1014 | */ | |
1015 | if (is_reloc(S_ABS, symname)) | |
1016 | break; | |
1017 | ||
1018 | if (is_reloc(S_REL, symname)) { | |
1019 | add_reloc(&relocs32, rel->r_offset); | |
873b5271 | 1020 | break; |
968de4f0 | 1021 | } |
5d442e63 KC |
1022 | } else { |
1023 | if (is_reloc(S_LIN, symname)) | |
1024 | add_reloc(&relocs32, rel->r_offset); | |
1025 | break; | |
968de4f0 | 1026 | } |
17608373 | 1027 | die("Invalid %s %s relocation: %s\n", shn_abs ? "absolute" : "relative", rel_type(r_type), symname); |
5d442e63 | 1028 | break; |
968de4f0 | 1029 | |
5d442e63 | 1030 | default: |
17608373 | 1031 | die("Unsupported relocation type: %s (%d)\n", rel_type(r_type), r_type); |
5d442e63 KC |
1032 | break; |
1033 | } | |
968de4f0 | 1034 | |
5d442e63 | 1035 | return 0; |
968de4f0 EB |
1036 | } |
1037 | ||
c889ba80 PA |
1038 | #endif |
1039 | ||
968de4f0 EB |
1040 | static int cmp_relocs(const void *va, const void *vb) |
1041 | { | |
5d442e63 | 1042 | const uint32_t *a, *b; |
17608373 IM |
1043 | |
1044 | a = va; | |
1045 | b = vb; | |
1046 | ||
968de4f0 EB |
1047 | return (*a == *b)? 0 : (*a > *b)? 1 : -1; |
1048 | } | |
1049 | ||
5d442e63 KC |
1050 | static void sort_relocs(struct relocs *r) |
1051 | { | |
1052 | qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs); | |
1053 | } | |
1054 | ||
1055 | static int write32(uint32_t v, FILE *f) | |
6520fe55 PA |
1056 | { |
1057 | unsigned char buf[4]; | |
1058 | ||
1059 | put_unaligned_le32(v, buf); | |
17608373 | 1060 | |
6520fe55 PA |
1061 | return fwrite(buf, 1, 4, f) == 4 ? 0 : -1; |
1062 | } | |
1063 | ||
5d442e63 KC |
1064 | static int write32_as_text(uint32_t v, FILE *f) |
1065 | { | |
1066 | return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1; | |
1067 | } | |
1068 | ||
6520fe55 | 1069 | static void emit_relocs(int as_text, int use_real_mode) |
968de4f0 EB |
1070 | { |
1071 | int i; | |
5d442e63 | 1072 | int (*write_reloc)(uint32_t, FILE *) = write32; |
17608373 | 1073 | int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, const char *symname); |
946166af | 1074 | |
c889ba80 PA |
1075 | #if ELF_BITS == 64 |
1076 | if (!use_real_mode) | |
946166af | 1077 | do_reloc = do_reloc64; |
c889ba80 PA |
1078 | else |
1079 | die("--realmode not valid for a 64-bit ELF file"); | |
1080 | #else | |
1081 | if (!use_real_mode) | |
946166af KC |
1082 | do_reloc = do_reloc32; |
1083 | else | |
1084 | do_reloc = do_reloc_real; | |
c889ba80 | 1085 | #endif |
6520fe55 | 1086 | |
968de4f0 | 1087 | /* Collect up the relocations */ |
946166af | 1088 | walk_relocs(do_reloc); |
6520fe55 | 1089 | |
5d442e63 | 1090 | if (relocs16.count && !use_real_mode) |
6520fe55 | 1091 | die("Segment relocations found but --realmode not specified\n"); |
968de4f0 EB |
1092 | |
1093 | /* Order the relocations for more efficient processing */ | |
5d442e63 | 1094 | sort_relocs(&relocs32); |
6d24c5f7 JB |
1095 | #if ELF_BITS == 64 |
1096 | sort_relocs(&relocs32neg); | |
946166af | 1097 | sort_relocs(&relocs64); |
7ebb9167 MT |
1098 | #else |
1099 | sort_relocs(&relocs16); | |
6d24c5f7 | 1100 | #endif |
968de4f0 EB |
1101 | |
1102 | /* Print the relocations */ | |
1103 | if (as_text) { | |
1104 | /* Print the relocations in a form suitable that | |
1105 | * gas will like. | |
1106 | */ | |
1107 | printf(".section \".data.reloc\",\"a\"\n"); | |
1108 | printf(".balign 4\n"); | |
5d442e63 | 1109 | write_reloc = write32_as_text; |
968de4f0 | 1110 | } |
6520fe55 | 1111 | |
5d442e63 KC |
1112 | if (use_real_mode) { |
1113 | write_reloc(relocs16.count, stdout); | |
1114 | for (i = 0; i < relocs16.count; i++) | |
1115 | write_reloc(relocs16.offset[i], stdout); | |
1116 | ||
1117 | write_reloc(relocs32.count, stdout); | |
1118 | for (i = 0; i < relocs32.count; i++) | |
1119 | write_reloc(relocs32.offset[i], stdout); | |
1120 | } else { | |
6d24c5f7 JB |
1121 | #if ELF_BITS == 64 |
1122 | /* Print a stop */ | |
1123 | write_reloc(0, stdout); | |
946166af | 1124 | |
6d24c5f7 JB |
1125 | /* Now print each relocation */ |
1126 | for (i = 0; i < relocs64.count; i++) | |
1127 | write_reloc(relocs64.offset[i], stdout); | |
1128 | ||
1129 | /* Print a stop */ | |
1130 | write_reloc(0, stdout); | |
1131 | ||
1132 | /* Now print each inverse 32-bit relocation */ | |
1133 | for (i = 0; i < relocs32neg.count; i++) | |
1134 | write_reloc(relocs32neg.offset[i], stdout); | |
1135 | #endif | |
946166af | 1136 | |
5d442e63 KC |
1137 | /* Print a stop */ |
1138 | write_reloc(0, stdout); | |
1139 | ||
1140 | /* Now print each relocation */ | |
1141 | for (i = 0; i < relocs32.count; i++) | |
1142 | write_reloc(relocs32.offset[i], stdout); | |
968de4f0 EB |
1143 | } |
1144 | } | |
1145 | ||
214a8876 MD |
1146 | /* |
1147 | * As an aid to debugging problems with different linkers | |
1148 | * print summary information about the relocs. | |
1149 | * Since different linkers tend to emit the sections in | |
1150 | * different orders we use the section names in the output. | |
1151 | */ | |
1152 | static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, | |
1153 | const char *symname) | |
1154 | { | |
1155 | printf("%s\t%s\t%s\t%s\n", | |
1156 | sec_name(sec->shdr.sh_info), | |
1157 | rel_type(ELF_R_TYPE(rel->r_info)), | |
1158 | symname, | |
a54c401a | 1159 | sec_name(sym_index(sym))); |
17608373 | 1160 | |
214a8876 MD |
1161 | return 0; |
1162 | } | |
1163 | ||
1164 | static void print_reloc_info(void) | |
1165 | { | |
1166 | printf("reloc section\treloc type\tsymbol\tsymbol section\n"); | |
1167 | walk_relocs(do_reloc_info); | |
1168 | } | |
1169 | ||
c889ba80 PA |
1170 | #if ELF_BITS == 64 |
1171 | # define process process_64 | |
1172 | #else | |
1173 | # define process process_32 | |
1174 | #endif | |
968de4f0 | 1175 | |
c889ba80 | 1176 | void process(FILE *fp, int use_real_mode, int as_text, |
214a8876 MD |
1177 | int show_absolute_syms, int show_absolute_relocs, |
1178 | int show_reloc_info) | |
968de4f0 | 1179 | { |
6520fe55 | 1180 | regex_init(use_real_mode); |
968de4f0 EB |
1181 | read_ehdr(fp); |
1182 | read_shdrs(fp); | |
1183 | read_strtabs(fp); | |
1184 | read_symtabs(fp); | |
1185 | read_relocs(fp); | |
17608373 | 1186 | |
c889ba80 | 1187 | if (ELF_BITS == 64) |
946166af | 1188 | percpu_init(); |
17608373 | 1189 | |
6a044b3a | 1190 | if (show_absolute_syms) { |
968de4f0 | 1191 | print_absolute_symbols(); |
c889ba80 | 1192 | return; |
6a044b3a | 1193 | } |
17608373 | 1194 | |
6a044b3a | 1195 | if (show_absolute_relocs) { |
968de4f0 | 1196 | print_absolute_relocs(); |
c889ba80 | 1197 | return; |
968de4f0 | 1198 | } |
17608373 | 1199 | |
214a8876 MD |
1200 | if (show_reloc_info) { |
1201 | print_reloc_info(); | |
1202 | return; | |
1203 | } | |
17608373 | 1204 | |
6520fe55 | 1205 | emit_relocs(as_text, use_real_mode); |
968de4f0 | 1206 | } |