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-rw-r--r--tools/perf/util/genelf.c185
1 files changed, 52 insertions, 133 deletions
diff --git a/tools/perf/util/genelf.c b/tools/perf/util/genelf.c
index c540d47583e7..a1cd5196f4ec 100644
--- a/tools/perf/util/genelf.c
+++ b/tools/perf/util/genelf.c
@@ -1,56 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* genelf.c
* Copyright (C) 2014, Google, Inc
*
* Contributed by:
* Stephane Eranian <eranian@gmail.com>
- *
- * Released under the GPL v2. (and only v2, not any later version)
*/
#include <sys/types.h>
-#include <stdio.h>
-#include <getopt.h>
#include <stddef.h>
#include <libelf.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
-#include <limits.h>
-#include <fcntl.h>
#include <err.h>
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef HAVE_LIBDW_SUPPORT
#include <dwarf.h>
#endif
-#include "perf.h"
#include "genelf.h"
+#include "sha1.h"
#include "../util/jitdump.h"
+#include <linux/compiler.h>
#ifndef NT_GNU_BUILD_ID
#define NT_GNU_BUILD_ID 3
#endif
-#define JVMTI
-
-#define BUILD_ID_URANDOM /* different uuid for each run */
-
-#ifdef HAVE_LIBCRYPTO
-
-#define BUILD_ID_MD5
-#undef BUILD_ID_SHA /* does not seem to work well when linked with Java */
-#undef BUILD_ID_URANDOM /* different uuid for each run */
-
-#ifdef BUILD_ID_SHA
-#include <openssl/sha.h>
-#endif
-
-#ifdef BUILD_ID_MD5
-#include <openssl/md5.h>
-#endif
-#endif
-
-
typedef struct {
unsigned int namesz; /* Size of entry's owner string */
unsigned int descsz; /* Size of the note descriptor */
@@ -58,11 +34,6 @@ typedef struct {
char name[0]; /* Start of the name+desc data */
} Elf_Note;
-struct options {
- char *output;
- int fd;
-};
-
static char shd_string_table[] = {
0,
'.', 't', 'e', 'x', 't', 0, /* 1 */
@@ -80,7 +51,7 @@ static char shd_string_table[] = {
static struct buildid_note {
Elf_Note desc; /* descsz: size of build-id, must be multiple of 4 */
char name[4]; /* GNU\0 */
- char build_id[20];
+ u8 build_id[SHA1_DIGEST_SIZE];
} bnote;
static Elf_Sym symtab[]={
@@ -101,60 +72,6 @@ static Elf_Sym symtab[]={
}
};
-#ifdef BUILD_ID_URANDOM
-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)
-{
- int fd;
- size_t sz = sizeof(note->build_id);
- ssize_t sret;
-
- fd = open("/dev/urandom", O_RDONLY);
- if (fd == -1)
- err(1, "cannot access /dev/urandom for builid");
-
- sret = read(fd, note->build_id, sz);
-
- close(fd);
-
- if (sret != (ssize_t)sz)
- memset(note->build_id, 0, sz);
-}
-#endif
-
-#ifdef BUILD_ID_SHA
-static void
-gen_build_id(struct buildid_note *note,
- unsigned long load_addr __maybe_unused,
- const void *code,
- size_t csize)
-{
- if (sizeof(note->build_id) < SHA_DIGEST_LENGTH)
- errx(1, "build_id too small for SHA1");
-
- SHA1(code, csize, (unsigned char *)note->build_id);
-}
-#endif
-
-#ifdef BUILD_ID_MD5
-static void
-gen_build_id(struct buildid_note *note, unsigned long load_addr, const void *code, size_t csize)
-{
- MD5_CTX context;
-
- if (sizeof(note->build_id) < 16)
- errx(1, "build_id too small for MD5");
-
- MD5_Init(&context);
- MD5_Update(&context, &load_addr, sizeof(load_addr));
- MD5_Update(&context, code, csize);
- MD5_Final((unsigned char *)note->build_id, &context);
-}
-#endif
-
static int
jit_add_eh_frame_info(Elf *e, void* unwinding, uint64_t unwinding_header_size,
uint64_t unwinding_size, uint64_t base_offset)
@@ -243,7 +160,7 @@ jit_add_eh_frame_info(Elf *e, void* unwinding, uint64_t unwinding_header_size,
* csize: the code size in bytes
*/
int
-jit_write_elf(int fd, uint64_t load_addr, const char *sym,
+jit_write_elf(int fd, uint64_t load_addr __maybe_unused, 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)
@@ -252,9 +169,12 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
Elf_Data *d;
Elf_Scn *scn;
Elf_Ehdr *ehdr;
+ Elf_Phdr *phdr;
Elf_Shdr *shdr;
uint64_t eh_frame_base_offset;
char *strsym = NULL;
+ void *build_id_data = NULL, *tmp;
+ int build_id_data_len;
int symlen;
int retval = -1;
@@ -287,6 +207,19 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
ehdr->e_shstrndx= unwinding ? 4 : 2; /* shdr index for section name */
/*
+ * setup program header
+ */
+ phdr = elf_newphdr(e, 1);
+ phdr[0].p_type = PT_LOAD;
+ phdr[0].p_offset = GEN_ELF_TEXT_OFFSET;
+ phdr[0].p_vaddr = GEN_ELF_TEXT_OFFSET;
+ phdr[0].p_paddr = GEN_ELF_TEXT_OFFSET;
+ phdr[0].p_filesz = csize;
+ phdr[0].p_memsz = csize;
+ phdr[0].p_flags = PF_X | PF_R;
+ phdr[0].p_align = 8;
+
+ /*
* setup text section
*/
scn = elf_newscn(e);
@@ -320,6 +253,14 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
shdr->sh_entsize = 0;
+ build_id_data = malloc(csize);
+ if (build_id_data == NULL) {
+ warnx("cannot allocate build-id data");
+ goto error;
+ }
+ memcpy(build_id_data, code, csize);
+ build_id_data_len = csize;
+
/*
* Setup .eh_frame_hdr and .eh_frame
*/
@@ -330,6 +271,7 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
eh_frame_base_offset);
if (retval)
goto error;
+ retval = -1;
}
/*
@@ -402,6 +344,15 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
shdr->sh_entsize = sizeof(Elf_Sym);
shdr->sh_link = unwinding ? 6 : 4; /* index of .strtab section */
+ tmp = realloc(build_id_data, build_id_data_len + sizeof(symtab));
+ if (tmp == NULL) {
+ warnx("cannot allocate build-id data");
+ goto error;
+ }
+ memcpy(tmp + build_id_data_len, symtab, sizeof(symtab));
+ build_id_data = tmp;
+ build_id_data_len += sizeof(symtab);
+
/*
* setup symbols string table
* 2 = 1 for 0 in 1st entry, 1 for the 0 at end of symbol for 2nd entry
@@ -444,6 +395,15 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
shdr->sh_flags = 0;
shdr->sh_entsize = 0;
+ tmp = realloc(build_id_data, build_id_data_len + symlen);
+ if (tmp == NULL) {
+ warnx("cannot allocate build-id data");
+ goto error;
+ }
+ memcpy(tmp + build_id_data_len, strsym, symlen);
+ build_id_data = tmp;
+ build_id_data_len += symlen;
+
/*
* setup build-id section
*/
@@ -462,7 +422,7 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
/*
* build-id generation
*/
- gen_build_id(&bnote, load_addr, code, csize);
+ sha1(build_id_data, build_id_data_len, bnote.build_id);
bnote.desc.namesz = sizeof(bnote.name); /* must include 0 termination */
bnote.desc.descsz = sizeof(bnote.build_id);
bnote.desc.type = NT_GNU_BUILD_ID;
@@ -488,7 +448,7 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym,
shdr->sh_size = sizeof(bnote);
shdr->sh_entsize = 0;
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef HAVE_LIBDW_SUPPORT
if (debug && nr_debug_entries) {
retval = jit_add_debug_info(e, load_addr, debug, nr_debug_entries);
if (retval)
@@ -507,48 +467,7 @@ error:
(void)elf_end(e);
free(strsym);
-
+ free(build_id_data);
return retval;
}
-
-#ifndef JVMTI
-
-static unsigned char x86_code[] = {
- 0xBB, 0x2A, 0x00, 0x00, 0x00, /* movl $42, %ebx */
- 0xB8, 0x01, 0x00, 0x00, 0x00, /* movl $1, %eax */
- 0xCD, 0x80 /* int $0x80 */
-};
-
-static struct options options;
-
-int main(int argc, char **argv)
-{
- int c, fd, ret;
-
- while ((c = getopt(argc, argv, "o:h")) != -1) {
- switch (c) {
- case 'o':
- options.output = optarg;
- break;
- case 'h':
- printf("Usage: genelf -o output_file [-h]\n");
- return 0;
- default:
- errx(1, "unknown option");
- }
- }
-
- fd = open(options.output, O_CREAT|O_TRUNC|O_RDWR, 0666);
- if (fd == -1)
- err(1, "cannot create file %s", options.output);
-
- ret = jit_write_elf(fd, "main", x86_code, sizeof(x86_code));
- close(fd);
-
- if (ret != 0)
- unlink(options.output);
-
- return ret;
-}
-#endif
generated by cgit (git 2.34.1) at 2025-12-25 03:06:42 +0000