diff options
Diffstat (limited to 'scripts/recordmcount.c')
| -rw-r--r-- | scripts/recordmcount.c | 151 |
1 files changed, 81 insertions, 70 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 5677fcc88a72..612268eabef4 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -48,21 +48,26 @@ static void *file_map; /* pointer of the mapped file */ static void *file_end; /* pointer to the end of the mapped file */ static int file_updated; /* flag to state file was changed */ static void *file_ptr; /* current file pointer location */ + 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 */ /* Per-file resource cleanup when multiple files. */ -static void cleanup(void) +static void file_append_cleanup(void) +{ + free(file_append); + file_append = NULL; + file_append_size = 0; + file_updated = 0; +} + +static void mmap_cleanup(void) { if (!mmap_failed) munmap(file_map, sb.st_size); else free(file_map); file_map = NULL; - free(file_append); - file_append = NULL; - file_append_size = 0; - file_updated = 0; } /* ulseek, uwrite, ...: Check return value for errors. */ @@ -103,7 +108,8 @@ static ssize_t uwrite(void const *const buf, size_t const count) } if (!file_append) { perror("write"); - cleanup(); + file_append_cleanup(); + mmap_cleanup(); return -1; } if (file_ptr < file_end) { @@ -129,12 +135,76 @@ static void * umalloc(size_t size) void *const addr = malloc(size); if (addr == 0) { fprintf(stderr, "malloc failed: %zu bytes\n", size); - cleanup(); + file_append_cleanup(); + mmap_cleanup(); return NULL; } return addr; } +/* + * Get the whole file as a programming convenience in order to avoid + * malloc+lseek+read+free of many pieces. If successful, then mmap + * avoids copying unused pieces; else just read the whole file. + * Open for both read and write; new info will be appended to the file. + * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr + * do not propagate to the file until an explicit overwrite at the last. + * This preserves most aspects of consistency (all except .st_size) + * for simultaneous readers of the file while we are appending to it. + * However, multiple writers still are bad. We choose not to use + * locking because it is expensive and the use case of kernel build + * makes multiple writers unlikely. + */ +static void *mmap_file(char const *fname) +{ + /* Avoid problems if early cleanup() */ + fd_map = -1; + mmap_failed = 1; + file_map = NULL; + file_ptr = NULL; + file_updated = 0; + sb.st_size = 0; + + fd_map = open(fname, O_RDONLY); + if (fd_map < 0) { + perror(fname); + return NULL; + } + if (fstat(fd_map, &sb) < 0) { + perror(fname); + goto out; + } + if (!S_ISREG(sb.st_mode)) { + fprintf(stderr, "not a regular file: %s\n", fname); + 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); + 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; + } + } else + mmap_failed = 0; +out: + close(fd_map); + fd_map = -1; + + file_end = file_map + sb.st_size; + + return file_map; +} + + static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; static unsigned char *ideal_nop; @@ -238,61 +308,6 @@ static int make_nop_arm64(void *map, size_t const offset) return 0; } -/* - * Get the whole file as a programming convenience in order to avoid - * malloc+lseek+read+free of many pieces. If successful, then mmap - * avoids copying unused pieces; else just read the whole file. - * Open for both read and write; new info will be appended to the file. - * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr - * do not propagate to the file until an explicit overwrite at the last. - * This preserves most aspects of consistency (all except .st_size) - * for simultaneous readers of the file while we are appending to it. - * However, multiple writers still are bad. We choose not to use - * locking because it is expensive and the use case of kernel build - * makes multiple writers unlikely. - */ -static void *mmap_file(char const *fname) -{ - file_map = NULL; - sb.st_size = 0; - fd_map = open(fname, O_RDONLY); - if (fd_map < 0) { - perror(fname); - return NULL; - } - if (fstat(fd_map, &sb) < 0) { - perror(fname); - goto out; - } - if (!S_ISREG(sb.st_mode)) { - fprintf(stderr, "not a regular file: %s\n", fname); - goto out; - } - file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, - fd_map, 0); - mmap_failed = 0; - if (file_map == MAP_FAILED) { - mmap_failed = 1; - file_map = umalloc(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 int write_file(const char *fname) { char tmp_file[strlen(fname) + 4]; @@ -438,10 +453,11 @@ static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) static int do_file(char const *const fname) { - Elf32_Ehdr *const ehdr = mmap_file(fname); unsigned int reltype = 0; + Elf32_Ehdr *ehdr; int rc = -1; + ehdr = mmap_file(fname); if (!ehdr) goto out; @@ -577,7 +593,8 @@ static int do_file(char const *const fname) rc = write_file(fname); out: - cleanup(); + file_append_cleanup(); + mmap_cleanup(); return rc; } @@ -620,12 +637,6 @@ int main(int argc, char *argv[]) strcmp(file + (len - ftrace_size), ftrace) == 0) continue; - /* 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; |