1 // SPDX-License-Identifier: GPL-2.0-only
59 	'.', 't', 'e', 'x', 't', 0,			/*  1 */
63 …'.', 'n', 'o', 't', 'e', '.', 'g', 'n', 'u', '.', 'b', 'u', 'i', 'l', 'd', '-', 'i', 'd', 0, /* 33…
64 	'.', 'd', 'e', 'b', 'u', 'g', '_', 'l', 'i', 'n', 'e', 0, /* 52 */
65 	'.', 'd', 'e', 'b', 'u', 'g', '_', 'i', 'n', 'f', 'o', 0, /* 64 */
66 	'.', 'd', 'e', 'b', 'u', 'g', '_', 'a', 'b', 'b', 'r', 'e', 'v', 0, /* 76 */
67 	'.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', '_', 'h', 'd', 'r', 0, /* 90 */
72 	Elf_Note desc;		/* descsz: size of build-id, must be multiple of 4 */
86 	{ .st_name  = 1, /* index in sym_string table */
88 	  .st_shndx = 1,
103 	size_t sz = sizeof(note->build_id);  in gen_build_id()
107 	if (fd == -1)  in gen_build_id()
108 		err(1, "cannot access /dev/urandom for buildid");  in gen_build_id()
110 	sret = read(fd, note->build_id, sz);  in gen_build_id()
115 		memset(note->build_id, 0, sz);  in gen_build_id()
126 	if (sizeof(note->build_id) < SHA_DIGEST_LENGTH)  in gen_build_id()
127 		errx(1, "build_id too small for SHA1");  in gen_build_id()
129 	SHA1(code, csize, (unsigned char *)note->build_id);  in gen_build_id()
139 	if (sizeof(note->build_id) < 16)  in gen_build_id()
140 		errx(1, "build_id too small for MD5");  in gen_build_id()
149 	EVP_DigestFinal_ex(mdctx, (unsigned char *)note->build_id, NULL);  in gen_build_id()
158 	Elf_Data *d;  in jit_add_eh_frame_info()  local
161 	uint64_t unwinding_table_size = unwinding_size - unwinding_header_size;  in jit_add_eh_frame_info()
169 		return -1;  in jit_add_eh_frame_info()
172 	d = elf_newdata(scn);  in jit_add_eh_frame_info()
173 	if (!d) {  in jit_add_eh_frame_info()
175 		return -1;  in jit_add_eh_frame_info()
178 	d->d_align = 8;  in jit_add_eh_frame_info()
179 	d->d_off = 0LL;  in jit_add_eh_frame_info()
180 	d->d_buf = unwinding;  in jit_add_eh_frame_info()
181 	d->d_type = ELF_T_BYTE;  in jit_add_eh_frame_info()
182 	d->d_size = unwinding_table_size;  in jit_add_eh_frame_info()
183 	d->d_version = EV_CURRENT;  in jit_add_eh_frame_info()
188 		return -1;  in jit_add_eh_frame_info()
191 	shdr->sh_name = 104;  in jit_add_eh_frame_info()
192 	shdr->sh_type = SHT_PROGBITS;  in jit_add_eh_frame_info()
193 	shdr->sh_addr = base_offset;  in jit_add_eh_frame_info()
194 	shdr->sh_flags = SHF_ALLOC;  in jit_add_eh_frame_info()
195 	shdr->sh_entsize = 0;  in jit_add_eh_frame_info()
203 		return -1;  in jit_add_eh_frame_info()
206 	d = elf_newdata(scn);  in jit_add_eh_frame_info()
207 	if (!d) {  in jit_add_eh_frame_info()
209 		return -1;  in jit_add_eh_frame_info()
212 	d->d_align = 4;  in jit_add_eh_frame_info()
213 	d->d_off = 0LL;  in jit_add_eh_frame_info()
214 	d->d_buf = unwinding + unwinding_table_size;  in jit_add_eh_frame_info()
215 	d->d_type = ELF_T_BYTE;  in jit_add_eh_frame_info()
216 	d->d_size = unwinding_header_size;  in jit_add_eh_frame_info()
217 	d->d_version = EV_CURRENT;  in jit_add_eh_frame_info()
222 		return -1;  in jit_add_eh_frame_info()
225 	shdr->sh_name = 90;  in jit_add_eh_frame_info()
226 	shdr->sh_type = SHT_PROGBITS;  in jit_add_eh_frame_info()
227 	shdr->sh_addr = base_offset + unwinding_table_size;  in jit_add_eh_frame_info()
228 	shdr->sh_flags = SHF_ALLOC;  in jit_add_eh_frame_info()
229 	shdr->sh_entsize = 0;  in jit_add_eh_frame_info()
237  * sym: function name (for native code - used as the symbol)
248 	Elf_Data *d;  in jit_write_elf()  local
256 	int retval = -1;  in jit_write_elf()
260 		return -1;  in jit_write_elf()
278 	ehdr->e_ident[EI_DATA] = GEN_ELF_ENDIAN;  in jit_write_elf()
279 	ehdr->e_ident[EI_CLASS] = GEN_ELF_CLASS;  in jit_write_elf()
280 	ehdr->e_machine = GEN_ELF_ARCH;  in jit_write_elf()
281 	ehdr->e_type = ET_DYN;  in jit_write_elf()
282 	ehdr->e_entry = GEN_ELF_TEXT_OFFSET;  in jit_write_elf()
283 	ehdr->e_version = EV_CURRENT;  in jit_write_elf()
284 	ehdr->e_shstrndx= unwinding ? 4 : 2; /* shdr index for section name */  in jit_write_elf()
289 	phdr = elf_newphdr(e, 1);  in jit_write_elf()
308 	d = elf_newdata(scn);  in jit_write_elf()
309 	if (!d) {  in jit_write_elf()
314 	d->d_align = 16;  in jit_write_elf()
315 	d->d_off = 0LL;  in jit_write_elf()
316 	d->d_buf = (void *)code;  in jit_write_elf()
317 	d->d_type = ELF_T_BYTE;  in jit_write_elf()
318 	d->d_size = csize;  in jit_write_elf()
319 	d->d_version = EV_CURRENT;  in jit_write_elf()
327 	shdr->sh_name = 1;  in jit_write_elf()
328 	shdr->sh_type = SHT_PROGBITS;  in jit_write_elf()
329 	shdr->sh_addr = GEN_ELF_TEXT_OFFSET;  in jit_write_elf()
330 	shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC;  in jit_write_elf()
331 	shdr->sh_entsize = 0;  in jit_write_elf()
343 		retval = -1;  in jit_write_elf()
355 	d = elf_newdata(scn);  in jit_write_elf()
356 	if (!d) {  in jit_write_elf()
361 	d->d_align = 1;  in jit_write_elf()
362 	d->d_off = 0LL;  in jit_write_elf()
363 	d->d_buf = shd_string_table;  in jit_write_elf()
364 	d->d_type = ELF_T_BYTE;  in jit_write_elf()
365 	d->d_size = sizeof(shd_string_table);  in jit_write_elf()
366 	d->d_version = EV_CURRENT;  in jit_write_elf()
374 	shdr->sh_name = 7; /* offset of '.shstrtab' in shd_string_table */  in jit_write_elf()
375 	shdr->sh_type = SHT_STRTAB;  in jit_write_elf()
376 	shdr->sh_flags = 0;  in jit_write_elf()
377 	shdr->sh_entsize = 0;  in jit_write_elf()
382 	symtab[1].st_size  = csize;  in jit_write_elf()
383 	symtab[1].st_value = GEN_ELF_TEXT_OFFSET;  in jit_write_elf()
391 	d = elf_newdata(scn);  in jit_write_elf()
392 	if (!d) {  in jit_write_elf()
397 	d->d_align = 8;  in jit_write_elf()
398 	d->d_off = 0LL;  in jit_write_elf()
399 	d->d_buf = symtab;  in jit_write_elf()
400 	d->d_type = ELF_T_SYM;  in jit_write_elf()
401 	d->d_size = sizeof(symtab);  in jit_write_elf()
402 	d->d_version = EV_CURRENT;  in jit_write_elf()
410 	shdr->sh_name = 17; /* offset of '.symtab' in shd_string_table */  in jit_write_elf()
411 	shdr->sh_type = SHT_SYMTAB;  in jit_write_elf()
412 	shdr->sh_flags = 0;  in jit_write_elf()
413 	shdr->sh_entsize = sizeof(Elf_Sym);  in jit_write_elf()
414 	shdr->sh_link = unwinding ? 6 : 4; /* index of .strtab section */  in jit_write_elf()
418 	 * 2 = 1 for 0 in 1st entry, 1 for the 0 at end of symbol for 2nd entry  in jit_write_elf()
421 	strsym = calloc(1, symlen);  in jit_write_elf()
426 	strcpy(strsym + 1, sym);  in jit_write_elf()
434 	d = elf_newdata(scn);  in jit_write_elf()
435 	if (!d) {  in jit_write_elf()
440 	d->d_align = 1;  in jit_write_elf()
441 	d->d_off = 0LL;  in jit_write_elf()
442 	d->d_buf = strsym;  in jit_write_elf()
443 	d->d_type = ELF_T_BYTE;  in jit_write_elf()
444 	d->d_size = symlen;  in jit_write_elf()
445 	d->d_version = EV_CURRENT;  in jit_write_elf()
453 	shdr->sh_name = 25; /* offset in shd_string_table */  in jit_write_elf()
454 	shdr->sh_type = SHT_STRTAB;  in jit_write_elf()
455 	shdr->sh_flags = 0;  in jit_write_elf()
456 	shdr->sh_entsize = 0;  in jit_write_elf()
459 	 * setup build-id section  in jit_write_elf()
467 	d = elf_newdata(scn);  in jit_write_elf()
468 	if (!d) {  in jit_write_elf()
474 	 * build-id generation  in jit_write_elf()
482 	d->d_align = 4;  in jit_write_elf()
483 	d->d_off = 0LL;  in jit_write_elf()
484 	d->d_buf = &bnote;  in jit_write_elf()
485 	d->d_type = ELF_T_BYTE;  in jit_write_elf()
486 	d->d_size = sizeof(bnote);  in jit_write_elf()
487 	d->d_version = EV_CURRENT;  in jit_write_elf()
495 	shdr->sh_name = 33; /* offset in shd_string_table */  in jit_write_elf()
496 	shdr->sh_type = SHT_NOTE;  in jit_write_elf()
497 	shdr->sh_addr = 0x0;  in jit_write_elf()
498 	shdr->sh_flags = SHF_ALLOC;  in jit_write_elf()
499 	shdr->sh_size = sizeof(bnote);  in jit_write_elf()
500 	shdr->sh_entsize = 0;  in jit_write_elf()