mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
246907611e
Trivial fix to spelling mistake in error message text Signed-off-by: Colin King <colin.king@canonical.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: kernel-janitors@vger.kernel.org Link: http://lkml.kernel.org/r/20180427193158.17932-1-colin.king@canonical.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
555 lines
11 KiB
C
555 lines
11 KiB
C
/*
|
|
* 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
|
|
#include <dwarf.h>
|
|
#endif
|
|
|
|
#include "perf.h"
|
|
#include "genelf.h"
|
|
#include "../util/jitdump.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 */
|
|
unsigned int type; /* Interpretation of the descriptor */
|
|
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 */
|
|
'.', 's', 'h', 's', 't', 'r', 't', 'a', 'b', 0, /* 7 */
|
|
'.', 's', 'y', 'm', 't', 'a', 'b', 0, /* 17 */
|
|
'.', 's', 't', 'r', 't', 'a', 'b', 0, /* 25 */
|
|
'.', 'n', 'o', 't', 'e', '.', 'g', 'n', 'u', '.', 'b', 'u', 'i', 'l', 'd', '-', 'i', 'd', 0, /* 33 */
|
|
'.', 'd', 'e', 'b', 'u', 'g', '_', 'l', 'i', 'n', 'e', 0, /* 52 */
|
|
'.', 'd', 'e', 'b', 'u', 'g', '_', 'i', 'n', 'f', 'o', 0, /* 64 */
|
|
'.', 'd', 'e', 'b', 'u', 'g', '_', 'a', 'b', 'b', 'r', 'e', 'v', 0, /* 76 */
|
|
'.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', '_', 'h', 'd', 'r', 0, /* 90 */
|
|
'.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', 0, /* 104 */
|
|
};
|
|
|
|
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];
|
|
} bnote;
|
|
|
|
static Elf_Sym symtab[]={
|
|
/* symbol 0 MUST be the undefined symbol */
|
|
{ .st_name = 0, /* index in sym_string table */
|
|
.st_info = ELF_ST_TYPE(STT_NOTYPE),
|
|
.st_shndx = 0, /* for now */
|
|
.st_value = 0x0,
|
|
.st_other = ELF_ST_VIS(STV_DEFAULT),
|
|
.st_size = 0,
|
|
},
|
|
{ .st_name = 1, /* index in sym_string table */
|
|
.st_info = ELF_ST_BIND(STB_LOCAL) | ELF_ST_TYPE(STT_FUNC),
|
|
.st_shndx = 1,
|
|
.st_value = 0, /* for now */
|
|
.st_other = ELF_ST_VIS(STV_DEFAULT),
|
|
.st_size = 0, /* for now */
|
|
}
|
|
};
|
|
|
|
#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 buildid");
|
|
|
|
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)
|
|
{
|
|
Elf_Data *d;
|
|
Elf_Scn *scn;
|
|
Elf_Shdr *shdr;
|
|
uint64_t unwinding_table_size = unwinding_size - unwinding_header_size;
|
|
|
|
/*
|
|
* setup eh_frame section
|
|
*/
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
return -1;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
return -1;
|
|
}
|
|
|
|
d->d_align = 8;
|
|
d->d_off = 0LL;
|
|
d->d_buf = unwinding;
|
|
d->d_type = ELF_T_BYTE;
|
|
d->d_size = unwinding_table_size;
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
return -1;
|
|
}
|
|
|
|
shdr->sh_name = 104;
|
|
shdr->sh_type = SHT_PROGBITS;
|
|
shdr->sh_addr = base_offset;
|
|
shdr->sh_flags = SHF_ALLOC;
|
|
shdr->sh_entsize = 0;
|
|
|
|
/*
|
|
* setup eh_frame_hdr section
|
|
*/
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
return -1;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
return -1;
|
|
}
|
|
|
|
d->d_align = 4;
|
|
d->d_off = 0LL;
|
|
d->d_buf = unwinding + unwinding_table_size;
|
|
d->d_type = ELF_T_BYTE;
|
|
d->d_size = unwinding_header_size;
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
return -1;
|
|
}
|
|
|
|
shdr->sh_name = 90;
|
|
shdr->sh_type = SHT_PROGBITS;
|
|
shdr->sh_addr = base_offset + unwinding_table_size;
|
|
shdr->sh_flags = SHF_ALLOC;
|
|
shdr->sh_entsize = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fd: file descriptor open for writing for the output file
|
|
* load_addr: code load address (could be zero, just used for buildid)
|
|
* sym: function name (for native code - used as the symbol)
|
|
* code: the native code
|
|
* csize: the code size in bytes
|
|
*/
|
|
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)
|
|
{
|
|
Elf *e;
|
|
Elf_Data *d;
|
|
Elf_Scn *scn;
|
|
Elf_Ehdr *ehdr;
|
|
Elf_Shdr *shdr;
|
|
uint64_t eh_frame_base_offset;
|
|
char *strsym = NULL;
|
|
int symlen;
|
|
int retval = -1;
|
|
|
|
if (elf_version(EV_CURRENT) == EV_NONE) {
|
|
warnx("ELF initialization failed");
|
|
return -1;
|
|
}
|
|
|
|
e = elf_begin(fd, ELF_C_WRITE, NULL);
|
|
if (!e) {
|
|
warnx("elf_begin failed");
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* setup ELF header
|
|
*/
|
|
ehdr = elf_newehdr(e);
|
|
if (!ehdr) {
|
|
warnx("cannot get ehdr");
|
|
goto error;
|
|
}
|
|
|
|
ehdr->e_ident[EI_DATA] = GEN_ELF_ENDIAN;
|
|
ehdr->e_ident[EI_CLASS] = GEN_ELF_CLASS;
|
|
ehdr->e_machine = GEN_ELF_ARCH;
|
|
ehdr->e_type = ET_DYN;
|
|
ehdr->e_entry = GEN_ELF_TEXT_OFFSET;
|
|
ehdr->e_version = EV_CURRENT;
|
|
ehdr->e_shstrndx= unwinding ? 4 : 2; /* shdr index for section name */
|
|
|
|
/*
|
|
* setup text section
|
|
*/
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
goto error;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
goto error;
|
|
}
|
|
|
|
d->d_align = 16;
|
|
d->d_off = 0LL;
|
|
d->d_buf = (void *)code;
|
|
d->d_type = ELF_T_BYTE;
|
|
d->d_size = csize;
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
goto error;
|
|
}
|
|
|
|
shdr->sh_name = 1;
|
|
shdr->sh_type = SHT_PROGBITS;
|
|
shdr->sh_addr = GEN_ELF_TEXT_OFFSET;
|
|
shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
|
|
shdr->sh_entsize = 0;
|
|
|
|
/*
|
|
* Setup .eh_frame_hdr and .eh_frame
|
|
*/
|
|
if (unwinding) {
|
|
eh_frame_base_offset = ALIGN_8(GEN_ELF_TEXT_OFFSET + csize);
|
|
retval = jit_add_eh_frame_info(e, unwinding,
|
|
unwinding_header_size, unwinding_size,
|
|
eh_frame_base_offset);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* setup section headers string table
|
|
*/
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
goto error;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
goto error;
|
|
}
|
|
|
|
d->d_align = 1;
|
|
d->d_off = 0LL;
|
|
d->d_buf = shd_string_table;
|
|
d->d_type = ELF_T_BYTE;
|
|
d->d_size = sizeof(shd_string_table);
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
goto error;
|
|
}
|
|
|
|
shdr->sh_name = 7; /* offset of '.shstrtab' in shd_string_table */
|
|
shdr->sh_type = SHT_STRTAB;
|
|
shdr->sh_flags = 0;
|
|
shdr->sh_entsize = 0;
|
|
|
|
/*
|
|
* setup symtab section
|
|
*/
|
|
symtab[1].st_size = csize;
|
|
symtab[1].st_value = GEN_ELF_TEXT_OFFSET;
|
|
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
goto error;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
goto error;
|
|
}
|
|
|
|
d->d_align = 8;
|
|
d->d_off = 0LL;
|
|
d->d_buf = symtab;
|
|
d->d_type = ELF_T_SYM;
|
|
d->d_size = sizeof(symtab);
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
goto error;
|
|
}
|
|
|
|
shdr->sh_name = 17; /* offset of '.symtab' in shd_string_table */
|
|
shdr->sh_type = SHT_SYMTAB;
|
|
shdr->sh_flags = 0;
|
|
shdr->sh_entsize = sizeof(Elf_Sym);
|
|
shdr->sh_link = unwinding ? 6 : 4; /* index of .strtab section */
|
|
|
|
/*
|
|
* setup symbols string table
|
|
* 2 = 1 for 0 in 1st entry, 1 for the 0 at end of symbol for 2nd entry
|
|
*/
|
|
symlen = 2 + strlen(sym);
|
|
strsym = calloc(1, symlen);
|
|
if (!strsym) {
|
|
warnx("cannot allocate strsym");
|
|
goto error;
|
|
}
|
|
strcpy(strsym + 1, sym);
|
|
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
goto error;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
goto error;
|
|
}
|
|
|
|
d->d_align = 1;
|
|
d->d_off = 0LL;
|
|
d->d_buf = strsym;
|
|
d->d_type = ELF_T_BYTE;
|
|
d->d_size = symlen;
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
goto error;
|
|
}
|
|
|
|
shdr->sh_name = 25; /* offset in shd_string_table */
|
|
shdr->sh_type = SHT_STRTAB;
|
|
shdr->sh_flags = 0;
|
|
shdr->sh_entsize = 0;
|
|
|
|
/*
|
|
* setup build-id section
|
|
*/
|
|
scn = elf_newscn(e);
|
|
if (!scn) {
|
|
warnx("cannot create section");
|
|
goto error;
|
|
}
|
|
|
|
d = elf_newdata(scn);
|
|
if (!d) {
|
|
warnx("cannot get new data");
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* build-id generation
|
|
*/
|
|
gen_build_id(&bnote, load_addr, code, csize);
|
|
bnote.desc.namesz = sizeof(bnote.name); /* must include 0 termination */
|
|
bnote.desc.descsz = sizeof(bnote.build_id);
|
|
bnote.desc.type = NT_GNU_BUILD_ID;
|
|
strcpy(bnote.name, "GNU");
|
|
|
|
d->d_align = 4;
|
|
d->d_off = 0LL;
|
|
d->d_buf = &bnote;
|
|
d->d_type = ELF_T_BYTE;
|
|
d->d_size = sizeof(bnote);
|
|
d->d_version = EV_CURRENT;
|
|
|
|
shdr = elf_getshdr(scn);
|
|
if (!shdr) {
|
|
warnx("cannot get section header");
|
|
goto error;
|
|
}
|
|
|
|
shdr->sh_name = 33; /* offset in shd_string_table */
|
|
shdr->sh_type = SHT_NOTE;
|
|
shdr->sh_addr = 0x0;
|
|
shdr->sh_flags = SHF_ALLOC;
|
|
shdr->sh_size = sizeof(bnote);
|
|
shdr->sh_entsize = 0;
|
|
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
if (debug && nr_debug_entries) {
|
|
retval = jit_add_debug_info(e, load_addr, debug, nr_debug_entries);
|
|
if (retval)
|
|
goto error;
|
|
} else
|
|
#endif
|
|
{
|
|
if (elf_update(e, ELF_C_WRITE) < 0) {
|
|
warnx("elf_update 4 failed");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
retval = 0;
|
|
error:
|
|
(void)elf_end(e);
|
|
|
|
free(strsym);
|
|
|
|
|
|
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
|