diff options
Diffstat (limited to 'tools/lib/bpf/elf.c')
| -rw-r--r-- | tools/lib/bpf/elf.c | 61 |
1 files changed, 41 insertions, 20 deletions
diff --git a/tools/lib/bpf/elf.c b/tools/lib/bpf/elf.c index 735ef10093ac..71363acdeb67 100644 --- a/tools/lib/bpf/elf.c +++ b/tools/lib/bpf/elf.c @@ -10,6 +10,42 @@ #define STRERR_BUFSIZE 128 +int elf_open(const char *binary_path, struct elf_fd *elf_fd) +{ + char errmsg[STRERR_BUFSIZE]; + int fd, ret; + Elf *elf; + + if (elf_version(EV_CURRENT) == EV_NONE) { + pr_warn("elf: failed to init libelf for %s\n", binary_path); + return -LIBBPF_ERRNO__LIBELF; + } + fd = open(binary_path, O_RDONLY | O_CLOEXEC); + if (fd < 0) { + ret = -errno; + pr_warn("elf: failed to open %s: %s\n", binary_path, + libbpf_strerror_r(ret, errmsg, sizeof(errmsg))); + return ret; + } + elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); + if (!elf) { + pr_warn("elf: could not read elf from %s: %s\n", binary_path, elf_errmsg(-1)); + close(fd); + return -LIBBPF_ERRNO__FORMAT; + } + elf_fd->fd = fd; + elf_fd->elf = elf; + return 0; +} + +void elf_close(struct elf_fd *elf_fd) +{ + if (!elf_fd) + return; + elf_end(elf_fd->elf); + close(elf_fd->fd); +} + /* Return next ELF section of sh_type after scn, or first of that type if scn is NULL. */ static Elf_Scn *elf_find_next_scn_by_type(Elf *elf, int sh_type, Elf_Scn *scn) { @@ -170,28 +206,13 @@ out: */ long elf_find_func_offset_from_file(const char *binary_path, const char *name) { - char errmsg[STRERR_BUFSIZE]; + struct elf_fd elf_fd; long ret = -ENOENT; - Elf *elf; - int fd; - fd = open(binary_path, O_RDONLY | O_CLOEXEC); - if (fd < 0) { - ret = -errno; - pr_warn("failed to open %s: %s\n", binary_path, - libbpf_strerror_r(ret, errmsg, sizeof(errmsg))); + ret = elf_open(binary_path, &elf_fd); + if (ret) return ret; - } - elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); - if (!elf) { - pr_warn("elf: could not read elf from %s: %s\n", binary_path, elf_errmsg(-1)); - close(fd); - return -LIBBPF_ERRNO__FORMAT; - } - - ret = elf_find_func_offset(elf, binary_path, name); - elf_end(elf); - close(fd); + ret = elf_find_func_offset(elf_fd.elf, binary_path, name); + elf_close(&elf_fd); return ret; } - |