#include <getopt.h>
#include <elf.h>
#include <fcntl.h>
-#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int mmap_failed; /* Boolean flag. */
static char gpfx; /* prefix for global symbol name (sometimes '_') */
static struct stat sb; /* Remember .st_size, etc. */
-static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */
static const char *altmcount; /* alternate mcount symbol name */
static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
static void *file_map; /* pointer of the mapped file */
static void *file_append; /* added to the end of the file */
static size_t file_append_size; /* how much is added to end of file */
-/* setjmp() return values */
-enum {
- SJ_SETJMP = 0, /* hardwired first return */
- SJ_FAIL,
- SJ_SUCCEED
-};
-
/* Per-file resource cleanup when multiple files. */
-static void
-cleanup(void)
+static void cleanup(void)
{
if (!mmap_failed)
munmap(file_map, sb.st_size);
file_updated = 0;
}
-static void __attribute__((noreturn))
-fail_file(void)
-{
- cleanup();
- longjmp(jmpenv, SJ_FAIL);
-}
-
-static void __attribute__((noreturn))
-succeed_file(void)
-{
- cleanup();
- longjmp(jmpenv, SJ_SUCCEED);
-}
+/* ulseek, uwrite, ...: Check return value for errors. */
-/* ulseek, uread, ...: Check return value for errors. */
-
-static off_t
-ulseek(int const fd, off_t const offset, int const whence)
+static off_t ulseek(off_t const offset, int const whence)
{
switch (whence) {
case SEEK_SET:
}
if (file_ptr < file_map) {
fprintf(stderr, "lseek: seek before file\n");
- fail_file();
+ return -1;
}
return file_ptr - file_map;
}
-static size_t
-uread(int const fd, void *const buf, size_t const count)
-{
- size_t const n = read(fd, buf, count);
- if (n != count) {
- perror("read");
- fail_file();
- }
- return n;
-}
-
-static size_t
-uwrite(int const fd, void const *const buf, size_t const count)
+static ssize_t uwrite(void const *const buf, size_t const count)
{
size_t cnt = count;
off_t idx = 0;
}
if (!file_append) {
perror("write");
- fail_file();
+ cleanup();
+ return -1;
}
if (file_ptr < file_end) {
cnt = file_end - file_ptr;
return count;
}
-static void *
-umalloc(size_t size)
+static void * umalloc(size_t size)
{
void *const addr = malloc(size);
if (addr == 0) {
fprintf(stderr, "malloc failed: %zu bytes\n", size);
- fail_file();
+ cleanup();
+ return NULL;
}
return addr;
}
return -1;
/* convert to nop */
- ulseek(fd_map, offset - 1, SEEK_SET);
- uwrite(fd_map, ideal_nop, 5);
+ if (ulseek(offset - 1, SEEK_SET) < 0)
+ return -1;
+ if (uwrite(ideal_nop, 5) < 0)
+ return -1;
return 0;
}
return -1;
/* Convert to nop */
- ulseek(fd_map, off, SEEK_SET);
+ if (ulseek(off, SEEK_SET) < 0)
+ return -1;
do {
- uwrite(fd_map, ideal_nop, nop_size);
+ if (uwrite(ideal_nop, nop_size) < 0)
+ return -1;
} while (--cnt > 0);
return 0;
return -1;
/* Convert to nop */
- ulseek(fd_map, offset, SEEK_SET);
- uwrite(fd_map, ideal_nop, 4);
+ if (ulseek(offset, SEEK_SET) < 0)
+ return -1;
+ if (uwrite(ideal_nop, 4) < 0)
+ return -1;
return 0;
}
*/
static void *mmap_file(char const *fname)
{
+ file_map = NULL;
+ sb.st_size = 0;
fd_map = open(fname, O_RDONLY);
- if (fd_map < 0 || fstat(fd_map, &sb) < 0) {
+ if (fd_map < 0) {
perror(fname);
- fail_file();
+ cleanup();
+ return NULL;
+ }
+ if (fstat(fd_map, &sb) < 0) {
+ perror(fname);
+ cleanup();
+ goto out;
}
if (!S_ISREG(sb.st_mode)) {
fprintf(stderr, "not a regular file: %s\n", fname);
- fail_file();
+ cleanup();
+ goto out;
}
file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
fd_map, 0);
if (file_map == MAP_FAILED) {
mmap_failed = 1;
file_map = umalloc(sb.st_size);
- uread(fd_map, file_map, sb.st_size);
+ if (!file_map) {
+ perror(fname);
+ goto out;
+ }
+ if (read(fd_map, file_map, sb.st_size) != sb.st_size) {
+ perror(fname);
+ free(file_map);
+ file_map = NULL;
+ goto out;
+ }
}
+out:
close(fd_map);
file_end = file_map + sb.st_size;
return file_map;
}
-static void write_file(const char *fname)
+static int write_file(const char *fname)
{
char tmp_file[strlen(fname) + 4];
size_t n;
if (!file_updated)
- return;
+ return 0;
sprintf(tmp_file, "%s.rc", fname);
fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode);
if (fd_map < 0) {
perror(fname);
- fail_file();
+ cleanup();
+ return -1;
}
n = write(fd_map, file_map, sb.st_size);
if (n != sb.st_size) {
perror("write");
- fail_file();
+ cleanup();
+ close(fd_map);
+ return -1;
}
if (file_append_size) {
n = write(fd_map, file_append, file_append_size);
if (n != file_append_size) {
perror("write");
- fail_file();
+ cleanup();
+ close(fd_map);
+ return -1;
}
}
close(fd_map);
if (rename(tmp_file, fname) < 0) {
perror(fname);
- fail_file();
+ cleanup();
+ return -1;
}
+ return 0;
}
/* w8rev, w8nat, ...: Handle endianness. */
static uint32_t (*w2)(uint16_t);
/* Names of the sections that could contain calls to mcount. */
-static int
-is_mcounted_section_name(char const *const txtname)
+static int is_mcounted_section_name(char const *const txtname)
{
return strncmp(".text", txtname, 5) == 0 ||
strcmp(".init.text", txtname) == 0 ||
strcmp(".irqentry.text", txtname) == 0 ||
strcmp(".softirqentry.text", txtname) == 0 ||
strcmp(".kprobes.text", txtname) == 0 ||
- strcmp(".cpuidle.text", txtname) == 0 ||
- strcmp(".text.unlikely", txtname) == 0;
+ strcmp(".cpuidle.text", txtname) == 0;
}
+static char const *already_has_rel_mcount = "success"; /* our work here is done! */
+
/* 32 bit and 64 bit are very similar */
#include "recordmcount.h"
#define RECORD_MCOUNT_64
}).r_info;
}
-static void
-do_file(char const *const fname)
+static int do_file(char const *const fname)
{
Elf32_Ehdr *const ehdr = mmap_file(fname);
unsigned int reltype = 0;
+ int rc = -1;
+
+ if (!ehdr)
+ goto out;
w = w4nat;
w2 = w2nat;
default:
fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
ehdr->e_ident[EI_DATA], fname);
- fail_file();
- break;
+ cleanup();
+ goto out;
case ELFDATA2LSB:
if (*(unsigned char const *)&endian != 1) {
/* main() is big endian, file.o is little endian. */
|| w2(ehdr->e_type) != ET_REL
|| ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
fprintf(stderr, "unrecognized ET_REL file %s\n", fname);
- fail_file();
+ cleanup();
+ goto out;
}
gpfx = 0;
default:
fprintf(stderr, "unrecognized e_machine %u %s\n",
w2(ehdr->e_machine), fname);
- fail_file();
- break;
+ cleanup();
+ goto out;
case EM_386:
reltype = R_386_32;
rel_type_nop = R_386_NONE;
default:
fprintf(stderr, "unrecognized ELF class %d %s\n",
ehdr->e_ident[EI_CLASS], fname);
- fail_file();
- break;
+ cleanup();
+ goto out;
case ELFCLASS32:
if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
|| w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
fprintf(stderr,
"unrecognized ET_REL file: %s\n", fname);
- fail_file();
+ cleanup();
+ goto out;
}
if (w2(ehdr->e_machine) == EM_MIPS) {
reltype = R_MIPS_32;
is_fake_mcount32 = MIPS32_is_fake_mcount;
}
- do32(ehdr, fname, reltype);
+ if (do32(ehdr, fname, reltype) < 0)
+ goto out;
break;
case ELFCLASS64: {
Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
|| w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
fprintf(stderr,
"unrecognized ET_REL file: %s\n", fname);
- fail_file();
+ cleanup();
+ goto out;
}
if (w2(ghdr->e_machine) == EM_S390) {
reltype = R_390_64;
Elf64_r_info = MIPS64_r_info;
is_fake_mcount64 = MIPS64_is_fake_mcount;
}
- do64(ghdr, fname, reltype);
+ if (do64(ghdr, fname, reltype) < 0)
+ goto out;
break;
}
} /* end switch */
- write_file(fname);
+ rc = write_file(fname);
+out:
cleanup();
+ return rc;
}
-int
-main(int argc, char *argv[])
+int main(int argc, char *argv[])
{
const char ftrace[] = "/ftrace.o";
int ftrace_size = sizeof(ftrace) - 1;
/* Process each file in turn, allowing deep failure. */
for (i = optind; i < argc; i++) {
char *file = argv[i];
- int const sjval = setjmp(jmpenv);
int len;
/*
strcmp(file + (len - ftrace_size), ftrace) == 0)
continue;
- switch (sjval) {
- default:
- fprintf(stderr, "internal error: %s\n", file);
- exit(1);
- break;
- case SJ_SETJMP: /* normal sequence */
- /* Avoid problems if early cleanup() */
- fd_map = -1;
- mmap_failed = 1;
- file_map = NULL;
- file_ptr = NULL;
- file_updated = 0;
- do_file(file);
- break;
- case SJ_FAIL: /* error in do_file or below */
+ /* Avoid problems if early cleanup() */
+ fd_map = -1;
+ mmap_failed = 1;
+ file_map = NULL;
+ file_ptr = NULL;
+ file_updated = 0;
+ if (do_file(file)) {
fprintf(stderr, "%s: failed\n", file);
++n_error;
- break;
- case SJ_SUCCEED: /* premature success */
- /* do nothing */
- break;
- } /* end switch */
+ }
}
return !!n_error;
}
projects / linux-2.6-block.git / blobdiff