191007045SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
29b07e27fSStephane Eranian /*
39b07e27fSStephane Eranian * genelf.c
49b07e27fSStephane Eranian * Copyright (C) 2014, Google, Inc
59b07e27fSStephane Eranian *
69b07e27fSStephane Eranian * Contributed by:
79b07e27fSStephane Eranian * Stephane Eranian <eranian@gmail.com>
89b07e27fSStephane Eranian */
99b07e27fSStephane Eranian
109b07e27fSStephane Eranian #include <sys/types.h>
119b07e27fSStephane Eranian #include <stddef.h>
129b07e27fSStephane Eranian #include <libelf.h>
139b07e27fSStephane Eranian #include <string.h>
149b07e27fSStephane Eranian #include <stdlib.h>
1591854f9aSArnaldo Carvalho de Melo #include <unistd.h>
169b07e27fSStephane Eranian #include <inttypes.h>
179b07e27fSStephane Eranian #include <fcntl.h>
189b07e27fSStephane Eranian #include <err.h>
19621cb4e7SMaciej Debski #ifdef HAVE_DWARF_SUPPORT
209b07e27fSStephane Eranian #include <dwarf.h>
21621cb4e7SMaciej Debski #endif
229b07e27fSStephane Eranian
239b07e27fSStephane Eranian #include "genelf.h"
249b07e27fSStephane Eranian #include "../util/jitdump.h"
2591854f9aSArnaldo Carvalho de Melo #include <linux/compiler.h>
269b07e27fSStephane Eranian
275fef5f3fSArnaldo Carvalho de Melo #ifndef NT_GNU_BUILD_ID
285fef5f3fSArnaldo Carvalho de Melo #define NT_GNU_BUILD_ID 3
295fef5f3fSArnaldo Carvalho de Melo #endif
305fef5f3fSArnaldo Carvalho de Melo
319b07e27fSStephane Eranian #define BUILD_ID_URANDOM /* different uuid for each run */
329b07e27fSStephane Eranian
3391cea6beSArnaldo Carvalho de Melo #ifdef HAVE_LIBCRYPTO_SUPPORT
349b07e27fSStephane Eranian
359b07e27fSStephane Eranian #define BUILD_ID_MD5
369b07e27fSStephane Eranian #undef BUILD_ID_SHA /* does not seem to work well when linked with Java */
379b07e27fSStephane Eranian #undef BUILD_ID_URANDOM /* different uuid for each run */
389b07e27fSStephane Eranian
399b07e27fSStephane Eranian #ifdef BUILD_ID_SHA
409b07e27fSStephane Eranian #include <openssl/sha.h>
419b07e27fSStephane Eranian #endif
429b07e27fSStephane Eranian
439b07e27fSStephane Eranian #ifdef BUILD_ID_MD5
446ea9da51SZixuan Tan #include <openssl/evp.h>
459b07e27fSStephane Eranian #include <openssl/md5.h>
469b07e27fSStephane Eranian #endif
479b07e27fSStephane Eranian #endif
489b07e27fSStephane Eranian
499b07e27fSStephane Eranian
509b07e27fSStephane Eranian typedef struct {
519b07e27fSStephane Eranian unsigned int namesz; /* Size of entry's owner string */
529b07e27fSStephane Eranian unsigned int descsz; /* Size of the note descriptor */
539b07e27fSStephane Eranian unsigned int type; /* Interpretation of the descriptor */
549b07e27fSStephane Eranian char name[0]; /* Start of the name+desc data */
559b07e27fSStephane Eranian } Elf_Note;
569b07e27fSStephane Eranian
579b07e27fSStephane Eranian static char shd_string_table[] = {
589b07e27fSStephane Eranian 0,
599b07e27fSStephane Eranian '.', 't', 'e', 'x', 't', 0, /* 1 */
609b07e27fSStephane Eranian '.', 's', 'h', 's', 't', 'r', 't', 'a', 'b', 0, /* 7 */
619b07e27fSStephane Eranian '.', 's', 'y', 'm', 't', 'a', 'b', 0, /* 17 */
629b07e27fSStephane Eranian '.', 's', 't', 'r', 't', 'a', 'b', 0, /* 25 */
639b07e27fSStephane Eranian '.', 'n', 'o', 't', 'e', '.', 'g', 'n', 'u', '.', 'b', 'u', 'i', 'l', 'd', '-', 'i', 'd', 0, /* 33 */
649b07e27fSStephane Eranian '.', 'd', 'e', 'b', 'u', 'g', '_', 'l', 'i', 'n', 'e', 0, /* 52 */
659b07e27fSStephane Eranian '.', 'd', 'e', 'b', 'u', 'g', '_', 'i', 'n', 'f', 'o', 0, /* 64 */
669b07e27fSStephane Eranian '.', 'd', 'e', 'b', 'u', 'g', '_', 'a', 'b', 'b', 'r', 'e', 'v', 0, /* 76 */
67086f9f3dSStefano Sanfilippo '.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', '_', 'h', 'd', 'r', 0, /* 90 */
68086f9f3dSStefano Sanfilippo '.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', 0, /* 104 */
699b07e27fSStephane Eranian };
709b07e27fSStephane Eranian
719b07e27fSStephane Eranian static struct buildid_note {
729b07e27fSStephane Eranian Elf_Note desc; /* descsz: size of build-id, must be multiple of 4 */
739b07e27fSStephane Eranian char name[4]; /* GNU\0 */
749b07e27fSStephane Eranian char build_id[20];
759b07e27fSStephane Eranian } bnote;
769b07e27fSStephane Eranian
779b07e27fSStephane Eranian static Elf_Sym symtab[]={
789b07e27fSStephane Eranian /* symbol 0 MUST be the undefined symbol */
799b07e27fSStephane Eranian { .st_name = 0, /* index in sym_string table */
809b07e27fSStephane Eranian .st_info = ELF_ST_TYPE(STT_NOTYPE),
819b07e27fSStephane Eranian .st_shndx = 0, /* for now */
829b07e27fSStephane Eranian .st_value = 0x0,
839b07e27fSStephane Eranian .st_other = ELF_ST_VIS(STV_DEFAULT),
849b07e27fSStephane Eranian .st_size = 0,
859b07e27fSStephane Eranian },
869b07e27fSStephane Eranian { .st_name = 1, /* index in sym_string table */
879b07e27fSStephane Eranian .st_info = ELF_ST_BIND(STB_LOCAL) | ELF_ST_TYPE(STT_FUNC),
889b07e27fSStephane Eranian .st_shndx = 1,
899b07e27fSStephane Eranian .st_value = 0, /* for now */
909b07e27fSStephane Eranian .st_other = ELF_ST_VIS(STV_DEFAULT),
919b07e27fSStephane Eranian .st_size = 0, /* for now */
929b07e27fSStephane Eranian }
939b07e27fSStephane Eranian };
949b07e27fSStephane Eranian
959b07e27fSStephane Eranian #ifdef BUILD_ID_URANDOM
969b07e27fSStephane Eranian static void
gen_build_id(struct buildid_note * note,unsigned long load_addr __maybe_unused,const void * code __maybe_unused,size_t csize __maybe_unused)979b07e27fSStephane Eranian gen_build_id(struct buildid_note *note,
989b07e27fSStephane Eranian unsigned long load_addr __maybe_unused,
999b07e27fSStephane Eranian const void *code __maybe_unused,
1009b07e27fSStephane Eranian size_t csize __maybe_unused)
1019b07e27fSStephane Eranian {
1029b07e27fSStephane Eranian int fd;
1039b07e27fSStephane Eranian size_t sz = sizeof(note->build_id);
1049b07e27fSStephane Eranian ssize_t sret;
1059b07e27fSStephane Eranian
1069b07e27fSStephane Eranian fd = open("/dev/urandom", O_RDONLY);
1079b07e27fSStephane Eranian if (fd == -1)
10824690761SColin Ian King err(1, "cannot access /dev/urandom for buildid");
1099b07e27fSStephane Eranian
1109b07e27fSStephane Eranian sret = read(fd, note->build_id, sz);
1119b07e27fSStephane Eranian
1129b07e27fSStephane Eranian close(fd);
1139b07e27fSStephane Eranian
1149b07e27fSStephane Eranian if (sret != (ssize_t)sz)
1159b07e27fSStephane Eranian memset(note->build_id, 0, sz);
1169b07e27fSStephane Eranian }
1179b07e27fSStephane Eranian #endif
1189b07e27fSStephane Eranian
1199b07e27fSStephane Eranian #ifdef BUILD_ID_SHA
1209b07e27fSStephane Eranian static void
gen_build_id(struct buildid_note * note,unsigned long load_addr __maybe_unused,const void * code,size_t csize)1219b07e27fSStephane Eranian gen_build_id(struct buildid_note *note,
1229b07e27fSStephane Eranian unsigned long load_addr __maybe_unused,
1239b07e27fSStephane Eranian const void *code,
1249b07e27fSStephane Eranian size_t csize)
1259b07e27fSStephane Eranian {
1269b07e27fSStephane Eranian if (sizeof(note->build_id) < SHA_DIGEST_LENGTH)
1279b07e27fSStephane Eranian errx(1, "build_id too small for SHA1");
1289b07e27fSStephane Eranian
1299b07e27fSStephane Eranian SHA1(code, csize, (unsigned char *)note->build_id);
1309b07e27fSStephane Eranian }
1319b07e27fSStephane Eranian #endif
1329b07e27fSStephane Eranian
1339b07e27fSStephane Eranian #ifdef BUILD_ID_MD5
1349b07e27fSStephane Eranian static void
gen_build_id(struct buildid_note * note,unsigned long load_addr,const void * code,size_t csize)1359b07e27fSStephane Eranian gen_build_id(struct buildid_note *note, unsigned long load_addr, const void *code, size_t csize)
1369b07e27fSStephane Eranian {
1376ea9da51SZixuan Tan EVP_MD_CTX *mdctx;
1389b07e27fSStephane Eranian
1399b07e27fSStephane Eranian if (sizeof(note->build_id) < 16)
1409b07e27fSStephane Eranian errx(1, "build_id too small for MD5");
1419b07e27fSStephane Eranian
1426ea9da51SZixuan Tan mdctx = EVP_MD_CTX_new();
1436ea9da51SZixuan Tan if (!mdctx)
1446ea9da51SZixuan Tan errx(2, "failed to create EVP_MD_CTX");
1456ea9da51SZixuan Tan
1466ea9da51SZixuan Tan EVP_DigestInit_ex(mdctx, EVP_md5(), NULL);
1476ea9da51SZixuan Tan EVP_DigestUpdate(mdctx, &load_addr, sizeof(load_addr));
1486ea9da51SZixuan Tan EVP_DigestUpdate(mdctx, code, csize);
1496ea9da51SZixuan Tan EVP_DigestFinal_ex(mdctx, (unsigned char *)note->build_id, NULL);
1506ea9da51SZixuan Tan EVP_MD_CTX_free(mdctx);
1519b07e27fSStephane Eranian }
1529b07e27fSStephane Eranian #endif
1539b07e27fSStephane Eranian
154086f9f3dSStefano Sanfilippo static int
jit_add_eh_frame_info(Elf * e,void * unwinding,uint64_t unwinding_header_size,uint64_t unwinding_size,uint64_t base_offset)155086f9f3dSStefano Sanfilippo jit_add_eh_frame_info(Elf *e, void* unwinding, uint64_t unwinding_header_size,
156086f9f3dSStefano Sanfilippo uint64_t unwinding_size, uint64_t base_offset)
157086f9f3dSStefano Sanfilippo {
158086f9f3dSStefano Sanfilippo Elf_Data *d;
159086f9f3dSStefano Sanfilippo Elf_Scn *scn;
160086f9f3dSStefano Sanfilippo Elf_Shdr *shdr;
161086f9f3dSStefano Sanfilippo uint64_t unwinding_table_size = unwinding_size - unwinding_header_size;
162086f9f3dSStefano Sanfilippo
163086f9f3dSStefano Sanfilippo /*
164086f9f3dSStefano Sanfilippo * setup eh_frame section
165086f9f3dSStefano Sanfilippo */
166086f9f3dSStefano Sanfilippo scn = elf_newscn(e);
167086f9f3dSStefano Sanfilippo if (!scn) {
168086f9f3dSStefano Sanfilippo warnx("cannot create section");
169086f9f3dSStefano Sanfilippo return -1;
170086f9f3dSStefano Sanfilippo }
171086f9f3dSStefano Sanfilippo
172086f9f3dSStefano Sanfilippo d = elf_newdata(scn);
173086f9f3dSStefano Sanfilippo if (!d) {
174086f9f3dSStefano Sanfilippo warnx("cannot get new data");
175086f9f3dSStefano Sanfilippo return -1;
176086f9f3dSStefano Sanfilippo }
177086f9f3dSStefano Sanfilippo
178086f9f3dSStefano Sanfilippo d->d_align = 8;
179086f9f3dSStefano Sanfilippo d->d_off = 0LL;
180086f9f3dSStefano Sanfilippo d->d_buf = unwinding;
181086f9f3dSStefano Sanfilippo d->d_type = ELF_T_BYTE;
182086f9f3dSStefano Sanfilippo d->d_size = unwinding_table_size;
183086f9f3dSStefano Sanfilippo d->d_version = EV_CURRENT;
184086f9f3dSStefano Sanfilippo
185086f9f3dSStefano Sanfilippo shdr = elf_getshdr(scn);
186086f9f3dSStefano Sanfilippo if (!shdr) {
187086f9f3dSStefano Sanfilippo warnx("cannot get section header");
188086f9f3dSStefano Sanfilippo return -1;
189086f9f3dSStefano Sanfilippo }
190086f9f3dSStefano Sanfilippo
191086f9f3dSStefano Sanfilippo shdr->sh_name = 104;
192086f9f3dSStefano Sanfilippo shdr->sh_type = SHT_PROGBITS;
193086f9f3dSStefano Sanfilippo shdr->sh_addr = base_offset;
194086f9f3dSStefano Sanfilippo shdr->sh_flags = SHF_ALLOC;
195086f9f3dSStefano Sanfilippo shdr->sh_entsize = 0;
196086f9f3dSStefano Sanfilippo
197086f9f3dSStefano Sanfilippo /*
198086f9f3dSStefano Sanfilippo * setup eh_frame_hdr section
199086f9f3dSStefano Sanfilippo */
200086f9f3dSStefano Sanfilippo scn = elf_newscn(e);
201086f9f3dSStefano Sanfilippo if (!scn) {
202086f9f3dSStefano Sanfilippo warnx("cannot create section");
203086f9f3dSStefano Sanfilippo return -1;
204086f9f3dSStefano Sanfilippo }
205086f9f3dSStefano Sanfilippo
206086f9f3dSStefano Sanfilippo d = elf_newdata(scn);
207086f9f3dSStefano Sanfilippo if (!d) {
208086f9f3dSStefano Sanfilippo warnx("cannot get new data");
209086f9f3dSStefano Sanfilippo return -1;
210086f9f3dSStefano Sanfilippo }
211086f9f3dSStefano Sanfilippo
212086f9f3dSStefano Sanfilippo d->d_align = 4;
213086f9f3dSStefano Sanfilippo d->d_off = 0LL;
214086f9f3dSStefano Sanfilippo d->d_buf = unwinding + unwinding_table_size;
215086f9f3dSStefano Sanfilippo d->d_type = ELF_T_BYTE;
216086f9f3dSStefano Sanfilippo d->d_size = unwinding_header_size;
217086f9f3dSStefano Sanfilippo d->d_version = EV_CURRENT;
218086f9f3dSStefano Sanfilippo
219086f9f3dSStefano Sanfilippo shdr = elf_getshdr(scn);
220086f9f3dSStefano Sanfilippo if (!shdr) {
221086f9f3dSStefano Sanfilippo warnx("cannot get section header");
222086f9f3dSStefano Sanfilippo return -1;
223086f9f3dSStefano Sanfilippo }
224086f9f3dSStefano Sanfilippo
225086f9f3dSStefano Sanfilippo shdr->sh_name = 90;
226086f9f3dSStefano Sanfilippo shdr->sh_type = SHT_PROGBITS;
227086f9f3dSStefano Sanfilippo shdr->sh_addr = base_offset + unwinding_table_size;
228086f9f3dSStefano Sanfilippo shdr->sh_flags = SHF_ALLOC;
229086f9f3dSStefano Sanfilippo shdr->sh_entsize = 0;
230086f9f3dSStefano Sanfilippo
231086f9f3dSStefano Sanfilippo return 0;
232086f9f3dSStefano Sanfilippo }
233086f9f3dSStefano Sanfilippo
2349b07e27fSStephane Eranian /*
2359b07e27fSStephane Eranian * fd: file descriptor open for writing for the output file
2369b07e27fSStephane Eranian * load_addr: code load address (could be zero, just used for buildid)
2379b07e27fSStephane Eranian * sym: function name (for native code - used as the symbol)
2389b07e27fSStephane Eranian * code: the native code
2399b07e27fSStephane Eranian * csize: the code size in bytes
2409b07e27fSStephane Eranian */
2419b07e27fSStephane Eranian int
jit_write_elf(int fd,uint64_t load_addr,const char * sym,const void * code,int csize,void * debug __maybe_unused,int nr_debug_entries __maybe_unused,void * unwinding,uint64_t unwinding_header_size,uint64_t unwinding_size)2429b07e27fSStephane Eranian jit_write_elf(int fd, uint64_t load_addr, const char *sym,
243598b7c69SStephane Eranian const void *code, int csize,
244086f9f3dSStefano Sanfilippo void *debug __maybe_unused, int nr_debug_entries __maybe_unused,
245086f9f3dSStefano Sanfilippo void *unwinding, uint64_t unwinding_header_size, uint64_t unwinding_size)
2469b07e27fSStephane Eranian {
2479b07e27fSStephane Eranian Elf *e;
2489b07e27fSStephane Eranian Elf_Data *d;
2499b07e27fSStephane Eranian Elf_Scn *scn;
2509b07e27fSStephane Eranian Elf_Ehdr *ehdr;
251babd0438SLieven Hey Elf_Phdr *phdr;
2529b07e27fSStephane Eranian Elf_Shdr *shdr;
253086f9f3dSStefano Sanfilippo uint64_t eh_frame_base_offset;
2549b07e27fSStephane Eranian char *strsym = NULL;
2559b07e27fSStephane Eranian int symlen;
2569b07e27fSStephane Eranian int retval = -1;
2579b07e27fSStephane Eranian
2589b07e27fSStephane Eranian if (elf_version(EV_CURRENT) == EV_NONE) {
2599b07e27fSStephane Eranian warnx("ELF initialization failed");
2609b07e27fSStephane Eranian return -1;
2619b07e27fSStephane Eranian }
2629b07e27fSStephane Eranian
2639b07e27fSStephane Eranian e = elf_begin(fd, ELF_C_WRITE, NULL);
2649b07e27fSStephane Eranian if (!e) {
2659b07e27fSStephane Eranian warnx("elf_begin failed");
2669b07e27fSStephane Eranian goto error;
2679b07e27fSStephane Eranian }
2689b07e27fSStephane Eranian
2699b07e27fSStephane Eranian /*
2709b07e27fSStephane Eranian * setup ELF header
2719b07e27fSStephane Eranian */
2729b07e27fSStephane Eranian ehdr = elf_newehdr(e);
2739b07e27fSStephane Eranian if (!ehdr) {
2749b07e27fSStephane Eranian warnx("cannot get ehdr");
2759b07e27fSStephane Eranian goto error;
2769b07e27fSStephane Eranian }
2779b07e27fSStephane Eranian
2789b07e27fSStephane Eranian ehdr->e_ident[EI_DATA] = GEN_ELF_ENDIAN;
2799b07e27fSStephane Eranian ehdr->e_ident[EI_CLASS] = GEN_ELF_CLASS;
2809b07e27fSStephane Eranian ehdr->e_machine = GEN_ELF_ARCH;
2819b07e27fSStephane Eranian ehdr->e_type = ET_DYN;
2829b07e27fSStephane Eranian ehdr->e_entry = GEN_ELF_TEXT_OFFSET;
2839b07e27fSStephane Eranian ehdr->e_version = EV_CURRENT;
284086f9f3dSStefano Sanfilippo ehdr->e_shstrndx= unwinding ? 4 : 2; /* shdr index for section name */
2859b07e27fSStephane Eranian
2869b07e27fSStephane Eranian /*
287babd0438SLieven Hey * setup program header
288babd0438SLieven Hey */
289babd0438SLieven Hey phdr = elf_newphdr(e, 1);
290babd0438SLieven Hey phdr[0].p_type = PT_LOAD;
291*1af47890SNamhyung Kim phdr[0].p_offset = GEN_ELF_TEXT_OFFSET;
292*1af47890SNamhyung Kim phdr[0].p_vaddr = GEN_ELF_TEXT_OFFSET;
293*1af47890SNamhyung Kim phdr[0].p_paddr = GEN_ELF_TEXT_OFFSET;
294babd0438SLieven Hey phdr[0].p_filesz = csize;
295babd0438SLieven Hey phdr[0].p_memsz = csize;
296babd0438SLieven Hey phdr[0].p_flags = PF_X | PF_R;
297babd0438SLieven Hey phdr[0].p_align = 8;
298babd0438SLieven Hey
299babd0438SLieven Hey /*
3009b07e27fSStephane Eranian * setup text section
3019b07e27fSStephane Eranian */
3029b07e27fSStephane Eranian scn = elf_newscn(e);
3039b07e27fSStephane Eranian if (!scn) {
3049b07e27fSStephane Eranian warnx("cannot create section");
3059b07e27fSStephane Eranian goto error;
3069b07e27fSStephane Eranian }
3079b07e27fSStephane Eranian
3089b07e27fSStephane Eranian d = elf_newdata(scn);
3099b07e27fSStephane Eranian if (!d) {
3109b07e27fSStephane Eranian warnx("cannot get new data");
3119b07e27fSStephane Eranian goto error;
3129b07e27fSStephane Eranian }
3139b07e27fSStephane Eranian
3149b07e27fSStephane Eranian d->d_align = 16;
3159b07e27fSStephane Eranian d->d_off = 0LL;
3169b07e27fSStephane Eranian d->d_buf = (void *)code;
3179b07e27fSStephane Eranian d->d_type = ELF_T_BYTE;
3189b07e27fSStephane Eranian d->d_size = csize;
3199b07e27fSStephane Eranian d->d_version = EV_CURRENT;
3209b07e27fSStephane Eranian
3219b07e27fSStephane Eranian shdr = elf_getshdr(scn);
3229b07e27fSStephane Eranian if (!shdr) {
3239b07e27fSStephane Eranian warnx("cannot get section header");
3249b07e27fSStephane Eranian goto error;
3259b07e27fSStephane Eranian }
3269b07e27fSStephane Eranian
3279b07e27fSStephane Eranian shdr->sh_name = 1;
3289b07e27fSStephane Eranian shdr->sh_type = SHT_PROGBITS;
3299b07e27fSStephane Eranian shdr->sh_addr = GEN_ELF_TEXT_OFFSET;
3309b07e27fSStephane Eranian shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
3319b07e27fSStephane Eranian shdr->sh_entsize = 0;
3329b07e27fSStephane Eranian
3339b07e27fSStephane Eranian /*
334086f9f3dSStefano Sanfilippo * Setup .eh_frame_hdr and .eh_frame
335086f9f3dSStefano Sanfilippo */
336086f9f3dSStefano Sanfilippo if (unwinding) {
337086f9f3dSStefano Sanfilippo eh_frame_base_offset = ALIGN_8(GEN_ELF_TEXT_OFFSET + csize);
338086f9f3dSStefano Sanfilippo retval = jit_add_eh_frame_info(e, unwinding,
339086f9f3dSStefano Sanfilippo unwinding_header_size, unwinding_size,
340086f9f3dSStefano Sanfilippo eh_frame_base_offset);
341086f9f3dSStefano Sanfilippo if (retval)
342086f9f3dSStefano Sanfilippo goto error;
343e8a6430fSShang XiaoJing retval = -1;
344086f9f3dSStefano Sanfilippo }
345086f9f3dSStefano Sanfilippo
346086f9f3dSStefano Sanfilippo /*
3479b07e27fSStephane Eranian * setup section headers string table
3489b07e27fSStephane Eranian */
3499b07e27fSStephane Eranian scn = elf_newscn(e);
3509b07e27fSStephane Eranian if (!scn) {
3519b07e27fSStephane Eranian warnx("cannot create section");
3529b07e27fSStephane Eranian goto error;
3539b07e27fSStephane Eranian }
3549b07e27fSStephane Eranian
3559b07e27fSStephane Eranian d = elf_newdata(scn);
3569b07e27fSStephane Eranian if (!d) {
3579b07e27fSStephane Eranian warnx("cannot get new data");
3589b07e27fSStephane Eranian goto error;
3599b07e27fSStephane Eranian }
3609b07e27fSStephane Eranian
3619b07e27fSStephane Eranian d->d_align = 1;
3629b07e27fSStephane Eranian d->d_off = 0LL;
3639b07e27fSStephane Eranian d->d_buf = shd_string_table;
3649b07e27fSStephane Eranian d->d_type = ELF_T_BYTE;
3659b07e27fSStephane Eranian d->d_size = sizeof(shd_string_table);
3669b07e27fSStephane Eranian d->d_version = EV_CURRENT;
3679b07e27fSStephane Eranian
3689b07e27fSStephane Eranian shdr = elf_getshdr(scn);
3699b07e27fSStephane Eranian if (!shdr) {
3709b07e27fSStephane Eranian warnx("cannot get section header");
3719b07e27fSStephane Eranian goto error;
3729b07e27fSStephane Eranian }
3739b07e27fSStephane Eranian
3749b07e27fSStephane Eranian shdr->sh_name = 7; /* offset of '.shstrtab' in shd_string_table */
3759b07e27fSStephane Eranian shdr->sh_type = SHT_STRTAB;
3769b07e27fSStephane Eranian shdr->sh_flags = 0;
3779b07e27fSStephane Eranian shdr->sh_entsize = 0;
3789b07e27fSStephane Eranian
3799b07e27fSStephane Eranian /*
3809b07e27fSStephane Eranian * setup symtab section
3819b07e27fSStephane Eranian */
3829b07e27fSStephane Eranian symtab[1].st_size = csize;
3839b07e27fSStephane Eranian symtab[1].st_value = GEN_ELF_TEXT_OFFSET;
3849b07e27fSStephane Eranian
3859b07e27fSStephane Eranian scn = elf_newscn(e);
3869b07e27fSStephane Eranian if (!scn) {
3879b07e27fSStephane Eranian warnx("cannot create section");
3889b07e27fSStephane Eranian goto error;
3899b07e27fSStephane Eranian }
3909b07e27fSStephane Eranian
3919b07e27fSStephane Eranian d = elf_newdata(scn);
3929b07e27fSStephane Eranian if (!d) {
3939b07e27fSStephane Eranian warnx("cannot get new data");
3949b07e27fSStephane Eranian goto error;
3959b07e27fSStephane Eranian }
3969b07e27fSStephane Eranian
3979b07e27fSStephane Eranian d->d_align = 8;
3989b07e27fSStephane Eranian d->d_off = 0LL;
3999b07e27fSStephane Eranian d->d_buf = symtab;
4009b07e27fSStephane Eranian d->d_type = ELF_T_SYM;
4019b07e27fSStephane Eranian d->d_size = sizeof(symtab);
4029b07e27fSStephane Eranian d->d_version = EV_CURRENT;
4039b07e27fSStephane Eranian
4049b07e27fSStephane Eranian shdr = elf_getshdr(scn);
4059b07e27fSStephane Eranian if (!shdr) {
4069b07e27fSStephane Eranian warnx("cannot get section header");
4079b07e27fSStephane Eranian goto error;
4089b07e27fSStephane Eranian }
4099b07e27fSStephane Eranian
4109b07e27fSStephane Eranian shdr->sh_name = 17; /* offset of '.symtab' in shd_string_table */
4119b07e27fSStephane Eranian shdr->sh_type = SHT_SYMTAB;
4129b07e27fSStephane Eranian shdr->sh_flags = 0;
4139b07e27fSStephane Eranian shdr->sh_entsize = sizeof(Elf_Sym);
414086f9f3dSStefano Sanfilippo shdr->sh_link = unwinding ? 6 : 4; /* index of .strtab section */
4159b07e27fSStephane Eranian
4169b07e27fSStephane Eranian /*
4179b07e27fSStephane Eranian * setup symbols string table
4189b07e27fSStephane Eranian * 2 = 1 for 0 in 1st entry, 1 for the 0 at end of symbol for 2nd entry
4199b07e27fSStephane Eranian */
4209b07e27fSStephane Eranian symlen = 2 + strlen(sym);
4219b07e27fSStephane Eranian strsym = calloc(1, symlen);
4229b07e27fSStephane Eranian if (!strsym) {
4239b07e27fSStephane Eranian warnx("cannot allocate strsym");
4249b07e27fSStephane Eranian goto error;
4259b07e27fSStephane Eranian }
4269b07e27fSStephane Eranian strcpy(strsym + 1, sym);
4279b07e27fSStephane Eranian
4289b07e27fSStephane Eranian scn = elf_newscn(e);
4299b07e27fSStephane Eranian if (!scn) {
4309b07e27fSStephane Eranian warnx("cannot create section");
4319b07e27fSStephane Eranian goto error;
4329b07e27fSStephane Eranian }
4339b07e27fSStephane Eranian
4349b07e27fSStephane Eranian d = elf_newdata(scn);
4359b07e27fSStephane Eranian if (!d) {
4369b07e27fSStephane Eranian warnx("cannot get new data");
4379b07e27fSStephane Eranian goto error;
4389b07e27fSStephane Eranian }
4399b07e27fSStephane Eranian
4409b07e27fSStephane Eranian d->d_align = 1;
4419b07e27fSStephane Eranian d->d_off = 0LL;
4429b07e27fSStephane Eranian d->d_buf = strsym;
4439b07e27fSStephane Eranian d->d_type = ELF_T_BYTE;
4449b07e27fSStephane Eranian d->d_size = symlen;
4459b07e27fSStephane Eranian d->d_version = EV_CURRENT;
4469b07e27fSStephane Eranian
4479b07e27fSStephane Eranian shdr = elf_getshdr(scn);
4489b07e27fSStephane Eranian if (!shdr) {
4499b07e27fSStephane Eranian warnx("cannot get section header");
4509b07e27fSStephane Eranian goto error;
4519b07e27fSStephane Eranian }
4529b07e27fSStephane Eranian
4539b07e27fSStephane Eranian shdr->sh_name = 25; /* offset in shd_string_table */
4549b07e27fSStephane Eranian shdr->sh_type = SHT_STRTAB;
4559b07e27fSStephane Eranian shdr->sh_flags = 0;
4569b07e27fSStephane Eranian shdr->sh_entsize = 0;
4579b07e27fSStephane Eranian
4589b07e27fSStephane Eranian /*
4599b07e27fSStephane Eranian * setup build-id section
4609b07e27fSStephane Eranian */
4619b07e27fSStephane Eranian scn = elf_newscn(e);
4629b07e27fSStephane Eranian if (!scn) {
4639b07e27fSStephane Eranian warnx("cannot create section");
4649b07e27fSStephane Eranian goto error;
4659b07e27fSStephane Eranian }
4669b07e27fSStephane Eranian
4679b07e27fSStephane Eranian d = elf_newdata(scn);
4689b07e27fSStephane Eranian if (!d) {
4699b07e27fSStephane Eranian warnx("cannot get new data");
4709b07e27fSStephane Eranian goto error;
4719b07e27fSStephane Eranian }
4729b07e27fSStephane Eranian
4739b07e27fSStephane Eranian /*
4749b07e27fSStephane Eranian * build-id generation
4759b07e27fSStephane Eranian */
4769b07e27fSStephane Eranian gen_build_id(&bnote, load_addr, code, csize);
4779b07e27fSStephane Eranian bnote.desc.namesz = sizeof(bnote.name); /* must include 0 termination */
4789b07e27fSStephane Eranian bnote.desc.descsz = sizeof(bnote.build_id);
4799b07e27fSStephane Eranian bnote.desc.type = NT_GNU_BUILD_ID;
4809b07e27fSStephane Eranian strcpy(bnote.name, "GNU");
4819b07e27fSStephane Eranian
4829b07e27fSStephane Eranian d->d_align = 4;
4839b07e27fSStephane Eranian d->d_off = 0LL;
4849b07e27fSStephane Eranian d->d_buf = &bnote;
4859b07e27fSStephane Eranian d->d_type = ELF_T_BYTE;
4869b07e27fSStephane Eranian d->d_size = sizeof(bnote);
4879b07e27fSStephane Eranian d->d_version = EV_CURRENT;
4889b07e27fSStephane Eranian
4899b07e27fSStephane Eranian shdr = elf_getshdr(scn);
4909b07e27fSStephane Eranian if (!shdr) {
4919b07e27fSStephane Eranian warnx("cannot get section header");
4929b07e27fSStephane Eranian goto error;
4939b07e27fSStephane Eranian }
4949b07e27fSStephane Eranian
4959b07e27fSStephane Eranian shdr->sh_name = 33; /* offset in shd_string_table */
4969b07e27fSStephane Eranian shdr->sh_type = SHT_NOTE;
4979b07e27fSStephane Eranian shdr->sh_addr = 0x0;
4989b07e27fSStephane Eranian shdr->sh_flags = SHF_ALLOC;
4999b07e27fSStephane Eranian shdr->sh_size = sizeof(bnote);
5009b07e27fSStephane Eranian shdr->sh_entsize = 0;
5019b07e27fSStephane Eranian
502621cb4e7SMaciej Debski #ifdef HAVE_DWARF_SUPPORT
503598b7c69SStephane Eranian if (debug && nr_debug_entries) {
504598b7c69SStephane Eranian retval = jit_add_debug_info(e, load_addr, debug, nr_debug_entries);
505598b7c69SStephane Eranian if (retval)
506598b7c69SStephane Eranian goto error;
507621cb4e7SMaciej Debski } else
508621cb4e7SMaciej Debski #endif
509621cb4e7SMaciej Debski {
5109b07e27fSStephane Eranian if (elf_update(e, ELF_C_WRITE) < 0) {
5119b07e27fSStephane Eranian warnx("elf_update 4 failed");
5129b07e27fSStephane Eranian goto error;
5139b07e27fSStephane Eranian }
514598b7c69SStephane Eranian }
5159b07e27fSStephane Eranian
5169b07e27fSStephane Eranian retval = 0;
5179b07e27fSStephane Eranian error:
5189b07e27fSStephane Eranian (void)elf_end(e);
5199b07e27fSStephane Eranian
5209b07e27fSStephane Eranian free(strsym);
5219b07e27fSStephane Eranian
5229b07e27fSStephane Eranian
5239b07e27fSStephane Eranian return retval;
5249b07e27fSStephane Eranian }
525