2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-24 05:04:00 +08:00
linux-next/tools/perf/util/symbol-minimal.c
Irina Tirdea 1d037ca164 perf tools: Use __maybe_used for unused variables
perf defines both __used and __unused variables to use for marking
unused variables. The variable __used is defined to
__attribute__((__unused__)), which contradicts the kernel definition to
__attribute__((__used__)) for new gcc versions. On Android, __used is
also defined in system headers and this leads to warnings like: warning:
'__used__' attribute ignored

__unused is not defined in the kernel and is not a standard definition.
If __unused is included everywhere instead of __used, this leads to
conflicts with glibc headers, since glibc has a variables with this name
in its headers.

The best approach is to use __maybe_unused, the definition used in the
kernel for __attribute__((unused)). In this way there is only one
definition in perf sources (instead of 2 definitions that point to the
same thing: __used and __unused) and it works on both Linux and Android.
This patch simply replaces all instances of __used and __unused with
__maybe_unused.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1347315303-29906-7-git-send-email-irina.tirdea@intel.com
[ committer note: fixed up conflict with a116e05 in builtin-sched.c ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-09-11 12:19:15 -03:00

308 lines
5.9 KiB
C

#include "symbol.h"
#include <elf.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <byteswap.h>
#include <sys/stat.h>
static bool check_need_swap(int file_endian)
{
const int data = 1;
u8 *check = (u8 *)&data;
int host_endian;
if (check[0] == 1)
host_endian = ELFDATA2LSB;
else
host_endian = ELFDATA2MSB;
return host_endian != file_endian;
}
#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
#define NT_GNU_BUILD_ID 3
static int read_build_id(void *note_data, size_t note_len, void *bf,
size_t size, bool need_swap)
{
struct {
u32 n_namesz;
u32 n_descsz;
u32 n_type;
} *nhdr;
void *ptr;
ptr = note_data;
while (ptr < (note_data + note_len)) {
const char *name;
size_t namesz, descsz;
nhdr = ptr;
if (need_swap) {
nhdr->n_namesz = bswap_32(nhdr->n_namesz);
nhdr->n_descsz = bswap_32(nhdr->n_descsz);
nhdr->n_type = bswap_32(nhdr->n_type);
}
namesz = NOTE_ALIGN(nhdr->n_namesz);
descsz = NOTE_ALIGN(nhdr->n_descsz);
ptr += sizeof(*nhdr);
name = ptr;
ptr += namesz;
if (nhdr->n_type == NT_GNU_BUILD_ID &&
nhdr->n_namesz == sizeof("GNU")) {
if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
size_t sz = min(size, descsz);
memcpy(bf, ptr, sz);
memset(bf + sz, 0, size - sz);
return 0;
}
}
ptr += descsz;
}
return -1;
}
int filename__read_debuglink(const char *filename __maybe_unused,
char *debuglink __maybe_unused,
size_t size __maybe_unused)
{
return -1;
}
/*
* Just try PT_NOTE header otherwise fails
*/
int filename__read_build_id(const char *filename, void *bf, size_t size)
{
FILE *fp;
int ret = -1;
bool need_swap = false;
u8 e_ident[EI_NIDENT];
size_t buf_size;
void *buf;
int i;
fp = fopen(filename, "r");
if (fp == NULL)
return -1;
if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
goto out;
if (memcmp(e_ident, ELFMAG, SELFMAG) ||
e_ident[EI_VERSION] != EV_CURRENT)
goto out;
need_swap = check_need_swap(e_ident[EI_DATA]);
/* for simplicity */
fseek(fp, 0, SEEK_SET);
if (e_ident[EI_CLASS] == ELFCLASS32) {
Elf32_Ehdr ehdr;
Elf32_Phdr *phdr;
if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
goto out;
if (need_swap) {
ehdr.e_phoff = bswap_32(ehdr.e_phoff);
ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
ehdr.e_phnum = bswap_16(ehdr.e_phnum);
}
buf_size = ehdr.e_phentsize * ehdr.e_phnum;
buf = malloc(buf_size);
if (buf == NULL)
goto out;
fseek(fp, ehdr.e_phoff, SEEK_SET);
if (fread(buf, buf_size, 1, fp) != 1)
goto out_free;
for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
void *tmp;
if (need_swap) {
phdr->p_type = bswap_32(phdr->p_type);
phdr->p_offset = bswap_32(phdr->p_offset);
phdr->p_filesz = bswap_32(phdr->p_filesz);
}
if (phdr->p_type != PT_NOTE)
continue;
buf_size = phdr->p_filesz;
tmp = realloc(buf, buf_size);
if (tmp == NULL)
goto out_free;
buf = tmp;
fseek(fp, phdr->p_offset, SEEK_SET);
if (fread(buf, buf_size, 1, fp) != 1)
goto out_free;
ret = read_build_id(buf, buf_size, bf, size, need_swap);
if (ret == 0)
ret = size;
break;
}
} else {
Elf64_Ehdr ehdr;
Elf64_Phdr *phdr;
if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
goto out;
if (need_swap) {
ehdr.e_phoff = bswap_64(ehdr.e_phoff);
ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
ehdr.e_phnum = bswap_16(ehdr.e_phnum);
}
buf_size = ehdr.e_phentsize * ehdr.e_phnum;
buf = malloc(buf_size);
if (buf == NULL)
goto out;
fseek(fp, ehdr.e_phoff, SEEK_SET);
if (fread(buf, buf_size, 1, fp) != 1)
goto out_free;
for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
void *tmp;
if (need_swap) {
phdr->p_type = bswap_32(phdr->p_type);
phdr->p_offset = bswap_64(phdr->p_offset);
phdr->p_filesz = bswap_64(phdr->p_filesz);
}
if (phdr->p_type != PT_NOTE)
continue;
buf_size = phdr->p_filesz;
tmp = realloc(buf, buf_size);
if (tmp == NULL)
goto out_free;
buf = tmp;
fseek(fp, phdr->p_offset, SEEK_SET);
if (fread(buf, buf_size, 1, fp) != 1)
goto out_free;
ret = read_build_id(buf, buf_size, bf, size, need_swap);
if (ret == 0)
ret = size;
break;
}
}
out_free:
free(buf);
out:
fclose(fp);
return ret;
}
int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
{
int fd;
int ret = -1;
struct stat stbuf;
size_t buf_size;
void *buf;
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
if (fstat(fd, &stbuf) < 0)
goto out;
buf_size = stbuf.st_size;
buf = malloc(buf_size);
if (buf == NULL)
goto out;
if (read(fd, buf, buf_size) != (ssize_t) buf_size)
goto out_free;
ret = read_build_id(buf, buf_size, build_id, size, false);
out_free:
free(buf);
out:
close(fd);
return ret;
}
int symsrc__init(struct symsrc *ss, struct dso *dso __maybe_unused,
const char *name,
enum dso_binary_type type)
{
int fd = open(name, O_RDONLY);
if (fd < 0)
return -1;
ss->name = strdup(name);
if (!ss->name)
goto out_close;
ss->type = type;
return 0;
out_close:
close(fd);
return -1;
}
bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
{
/* Assume all sym sources could be a runtime image. */
return true;
}
bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
{
return false;
}
void symsrc__destroy(struct symsrc *ss)
{
free(ss->name);
close(ss->fd);
}
int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
struct symsrc *ss __maybe_unused,
struct map *map __maybe_unused,
symbol_filter_t filter __maybe_unused)
{
return 0;
}
int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
struct symsrc *ss,
struct symsrc *runtime_ss __maybe_unused,
symbol_filter_t filter __maybe_unused,
int kmodule __maybe_unused)
{
unsigned char *build_id[BUILD_ID_SIZE];
if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
dso__set_build_id(dso, build_id);
return 1;
}
return 0;
}
void symbol__elf_init(void)
{
}