2 * Common eBPF ELF object loading operations.
4 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6 * Copyright (C) 2015 Huawei Inc.
17 #include <asm/unistd.h>
18 #include <linux/kernel.h>
19 #include <linux/bpf.h>
20 #include <linux/list.h>
27 #define __printf(a, b) __attribute__((format(printf, a, b)))
30 static int __base_pr(const char *format, ...)
35 va_start(args, format);
36 err = vfprintf(stderr, format, args);
41 static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
42 static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
43 static __printf(1, 2) libbpf_print_fn_t __pr_debug;
45 #define __pr(func, fmt, ...) \
48 (func)("libbpf: " fmt, ##__VA_ARGS__); \
51 #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
52 #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__)
53 #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__)
55 void libbpf_set_print(libbpf_print_fn_t warn,
56 libbpf_print_fn_t info,
57 libbpf_print_fn_t debug)
64 #define STRERR_BUFSIZE 128
66 #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
67 #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
68 #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
70 static const char *libbpf_strerror_table[NR_ERRNO] = {
71 [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
72 [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
73 [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
74 [ERRCODE_OFFSET(ENDIAN)] = "Endian missmatch",
75 [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
76 [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
77 [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
78 [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
79 [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
82 int libbpf_strerror(int err, char *buf, size_t size)
87 err = err > 0 ? err : -err;
89 if (err < __LIBBPF_ERRNO__START) {
92 ret = strerror_r(err, buf, size);
97 if (err < __LIBBPF_ERRNO__END) {
100 msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
101 snprintf(buf, size, "%s", msg);
102 buf[size - 1] = '\0';
106 snprintf(buf, size, "Unknown libbpf error %d", err);
107 buf[size - 1] = '\0';
111 #define CHECK_ERR(action, err, out) do { \
118 /* Copied from tools/perf/util/util.h */
120 # define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
124 # define zclose(fd) ({ \
127 ___err = close((fd)); \
132 #ifdef HAVE_LIBELF_MMAP_SUPPORT
133 # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP
135 # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ
139 * bpf_prog should be a better name but it has been used in
143 /* Index in elf obj file, for relocation use. */
146 struct bpf_insn *insns;
157 struct bpf_object *obj;
159 bpf_program_clear_priv_t clear_priv;
162 static LIST_HEAD(bpf_objects_list);
170 struct bpf_program *programs;
174 * This field is required because maps_buf will be freed and
175 * maps_buf_sz will be set to 0 after loaded.
181 * Information when doing elf related work. Only valid if fd
198 * All loaded bpf_object is linked in a list, which is
199 * hidden to caller. bpf_objects__<func> handlers deal with
202 struct list_head list;
205 #define obj_elf_valid(o) ((o)->efile.elf)
207 static void bpf_program__unload(struct bpf_program *prog)
215 static void bpf_program__exit(struct bpf_program *prog)
220 if (prog->clear_priv)
221 prog->clear_priv(prog, prog->priv);
224 prog->clear_priv = NULL;
226 bpf_program__unload(prog);
227 zfree(&prog->section_name);
229 zfree(&prog->reloc_desc);
237 bpf_program__init(void *data, size_t size, char *name, int idx,
238 struct bpf_program *prog)
240 if (size < sizeof(struct bpf_insn)) {
241 pr_warning("corrupted section '%s'\n", name);
245 bzero(prog, sizeof(*prog));
247 prog->section_name = strdup(name);
248 if (!prog->section_name) {
249 pr_warning("failed to alloc name for prog %s\n",
254 prog->insns = malloc(size);
256 pr_warning("failed to alloc insns for %s\n", name);
259 prog->insns_cnt = size / sizeof(struct bpf_insn);
260 memcpy(prog->insns, data,
261 prog->insns_cnt * sizeof(struct bpf_insn));
267 bpf_program__exit(prog);
272 bpf_object__add_program(struct bpf_object *obj, void *data, size_t size,
275 struct bpf_program prog, *progs;
278 err = bpf_program__init(data, size, name, idx, &prog);
282 progs = obj->programs;
283 nr_progs = obj->nr_programs;
285 progs = realloc(progs, sizeof(progs[0]) * (nr_progs + 1));
288 * In this case the original obj->programs
289 * is still valid, so don't need special treat for
290 * bpf_close_object().
292 pr_warning("failed to alloc a new program '%s'\n",
294 bpf_program__exit(&prog);
298 pr_debug("found program %s\n", prog.section_name);
299 obj->programs = progs;
300 obj->nr_programs = nr_progs + 1;
302 progs[nr_progs] = prog;
306 static struct bpf_object *bpf_object__new(const char *path,
310 struct bpf_object *obj;
312 obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1);
314 pr_warning("alloc memory failed for %s\n", path);
315 return ERR_PTR(-ENOMEM);
318 strcpy(obj->path, path);
322 * Caller of this function should also calls
323 * bpf_object__elf_finish() after data collection to return
324 * obj_buf to user. If not, we should duplicate the buffer to
325 * avoid user freeing them before elf finish.
327 obj->efile.obj_buf = obj_buf;
328 obj->efile.obj_buf_sz = obj_buf_sz;
332 INIT_LIST_HEAD(&obj->list);
333 list_add(&obj->list, &bpf_objects_list);
337 static void bpf_object__elf_finish(struct bpf_object *obj)
339 if (!obj_elf_valid(obj))
342 if (obj->efile.elf) {
343 elf_end(obj->efile.elf);
344 obj->efile.elf = NULL;
346 obj->efile.symbols = NULL;
348 zfree(&obj->efile.reloc);
349 obj->efile.nr_reloc = 0;
350 zclose(obj->efile.fd);
351 obj->efile.obj_buf = NULL;
352 obj->efile.obj_buf_sz = 0;
355 static int bpf_object__elf_init(struct bpf_object *obj)
360 if (obj_elf_valid(obj)) {
361 pr_warning("elf init: internal error\n");
362 return -LIBBPF_ERRNO__LIBELF;
365 if (obj->efile.obj_buf_sz > 0) {
367 * obj_buf should have been validated by
368 * bpf_object__open_buffer().
370 obj->efile.elf = elf_memory(obj->efile.obj_buf,
371 obj->efile.obj_buf_sz);
373 obj->efile.fd = open(obj->path, O_RDONLY);
374 if (obj->efile.fd < 0) {
375 pr_warning("failed to open %s: %s\n", obj->path,
380 obj->efile.elf = elf_begin(obj->efile.fd,
381 LIBBPF_ELF_C_READ_MMAP,
385 if (!obj->efile.elf) {
386 pr_warning("failed to open %s as ELF file\n",
388 err = -LIBBPF_ERRNO__LIBELF;
392 if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) {
393 pr_warning("failed to get EHDR from %s\n",
395 err = -LIBBPF_ERRNO__FORMAT;
398 ep = &obj->efile.ehdr;
400 if ((ep->e_type != ET_REL) || (ep->e_machine != 0)) {
401 pr_warning("%s is not an eBPF object file\n",
403 err = -LIBBPF_ERRNO__FORMAT;
409 bpf_object__elf_finish(obj);
414 bpf_object__check_endianness(struct bpf_object *obj)
416 static unsigned int const endian = 1;
418 switch (obj->efile.ehdr.e_ident[EI_DATA]) {
420 /* We are big endian, BPF obj is little endian. */
421 if (*(unsigned char const *)&endian != 1)
426 /* We are little endian, BPF obj is big endian. */
427 if (*(unsigned char const *)&endian != 0)
431 return -LIBBPF_ERRNO__ENDIAN;
437 pr_warning("Error: endianness mismatch.\n");
438 return -LIBBPF_ERRNO__ENDIAN;
442 bpf_object__init_license(struct bpf_object *obj,
443 void *data, size_t size)
445 memcpy(obj->license, data,
446 min(size, sizeof(obj->license) - 1));
447 pr_debug("license of %s is %s\n", obj->path, obj->license);
452 bpf_object__init_kversion(struct bpf_object *obj,
453 void *data, size_t size)
457 if (size != sizeof(kver)) {
458 pr_warning("invalid kver section in %s\n", obj->path);
459 return -LIBBPF_ERRNO__FORMAT;
461 memcpy(&kver, data, sizeof(kver));
462 obj->kern_version = kver;
463 pr_debug("kernel version of %s is %x\n", obj->path,
469 bpf_object__init_maps(struct bpf_object *obj, void *data,
473 pr_debug("%s doesn't need map definition\n",
478 obj->maps_buf = malloc(size);
479 if (!obj->maps_buf) {
480 pr_warning("malloc maps failed: %s\n", obj->path);
484 obj->maps_buf_sz = size;
485 memcpy(obj->maps_buf, data, size);
486 pr_debug("maps in %s: %ld bytes\n", obj->path, (long)size);
490 static bool section_have_execinstr(struct bpf_object *obj, int idx)
495 scn = elf_getscn(obj->efile.elf, idx);
499 if (gelf_getshdr(scn, &sh) != &sh)
502 if (sh.sh_flags & SHF_EXECINSTR)
508 static int bpf_object__elf_collect(struct bpf_object *obj)
510 Elf *elf = obj->efile.elf;
511 GElf_Ehdr *ep = &obj->efile.ehdr;
513 int idx = 0, err = 0;
515 /* Elf is corrupted/truncated, avoid calling elf_strptr. */
516 if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) {
517 pr_warning("failed to get e_shstrndx from %s\n",
519 return -LIBBPF_ERRNO__FORMAT;
522 while ((scn = elf_nextscn(elf, scn)) != NULL) {
528 if (gelf_getshdr(scn, &sh) != &sh) {
529 pr_warning("failed to get section header from %s\n",
531 err = -LIBBPF_ERRNO__FORMAT;
535 name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name);
537 pr_warning("failed to get section name from %s\n",
539 err = -LIBBPF_ERRNO__FORMAT;
543 data = elf_getdata(scn, 0);
545 pr_warning("failed to get section data from %s(%s)\n",
547 err = -LIBBPF_ERRNO__FORMAT;
550 pr_debug("section %s, size %ld, link %d, flags %lx, type=%d\n",
551 name, (unsigned long)data->d_size,
552 (int)sh.sh_link, (unsigned long)sh.sh_flags,
555 if (strcmp(name, "license") == 0)
556 err = bpf_object__init_license(obj,
559 else if (strcmp(name, "version") == 0)
560 err = bpf_object__init_kversion(obj,
563 else if (strcmp(name, "maps") == 0)
564 err = bpf_object__init_maps(obj, data->d_buf,
566 else if (sh.sh_type == SHT_SYMTAB) {
567 if (obj->efile.symbols) {
568 pr_warning("bpf: multiple SYMTAB in %s\n",
570 err = -LIBBPF_ERRNO__FORMAT;
572 obj->efile.symbols = data;
573 } else if ((sh.sh_type == SHT_PROGBITS) &&
574 (sh.sh_flags & SHF_EXECINSTR) &&
575 (data->d_size > 0)) {
576 err = bpf_object__add_program(obj, data->d_buf,
577 data->d_size, name, idx);
579 char errmsg[STRERR_BUFSIZE];
581 strerror_r(-err, errmsg, sizeof(errmsg));
582 pr_warning("failed to alloc program %s (%s): %s",
583 name, obj->path, errmsg);
585 } else if (sh.sh_type == SHT_REL) {
586 void *reloc = obj->efile.reloc;
587 int nr_reloc = obj->efile.nr_reloc + 1;
588 int sec = sh.sh_info; /* points to other section */
590 /* Only do relo for section with exec instructions */
591 if (!section_have_execinstr(obj, sec)) {
592 pr_debug("skip relo %s(%d) for section(%d)\n",
597 reloc = realloc(reloc,
598 sizeof(*obj->efile.reloc) * nr_reloc);
600 pr_warning("realloc failed\n");
603 int n = nr_reloc - 1;
605 obj->efile.reloc = reloc;
606 obj->efile.nr_reloc = nr_reloc;
608 obj->efile.reloc[n].shdr = sh;
609 obj->efile.reloc[n].data = data;
619 static struct bpf_program *
620 bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx)
622 struct bpf_program *prog;
625 for (i = 0; i < obj->nr_programs; i++) {
626 prog = &obj->programs[i];
627 if (prog->idx == idx)
634 bpf_program__collect_reloc(struct bpf_program *prog,
635 size_t nr_maps, GElf_Shdr *shdr,
636 Elf_Data *data, Elf_Data *symbols)
640 pr_debug("collecting relocating info for: '%s'\n",
642 nrels = shdr->sh_size / shdr->sh_entsize;
644 prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels);
645 if (!prog->reloc_desc) {
646 pr_warning("failed to alloc memory in relocation\n");
649 prog->nr_reloc = nrels;
651 for (i = 0; i < nrels; i++) {
654 unsigned int insn_idx;
655 struct bpf_insn *insns = prog->insns;
658 if (!gelf_getrel(data, i, &rel)) {
659 pr_warning("relocation: failed to get %d reloc\n", i);
660 return -LIBBPF_ERRNO__FORMAT;
663 insn_idx = rel.r_offset / sizeof(struct bpf_insn);
664 pr_debug("relocation: insn_idx=%u\n", insn_idx);
666 if (!gelf_getsym(symbols,
667 GELF_R_SYM(rel.r_info),
669 pr_warning("relocation: symbol %"PRIx64" not found\n",
670 GELF_R_SYM(rel.r_info));
671 return -LIBBPF_ERRNO__FORMAT;
674 if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) {
675 pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n",
676 insn_idx, insns[insn_idx].code);
677 return -LIBBPF_ERRNO__RELOC;
680 map_idx = sym.st_value / sizeof(struct bpf_map_def);
681 if (map_idx >= nr_maps) {
682 pr_warning("bpf relocation: map_idx %d large than %d\n",
683 (int)map_idx, (int)nr_maps - 1);
684 return -LIBBPF_ERRNO__RELOC;
687 prog->reloc_desc[i].insn_idx = insn_idx;
688 prog->reloc_desc[i].map_idx = map_idx;
694 bpf_object__create_maps(struct bpf_object *obj)
700 nr_maps = obj->maps_buf_sz / sizeof(struct bpf_map_def);
701 if (!obj->maps_buf || !nr_maps) {
702 pr_debug("don't need create maps for %s\n",
707 obj->map_fds = malloc(sizeof(int) * nr_maps);
709 pr_warning("realloc perf_bpf_map_fds failed\n");
712 obj->nr_map_fds = nr_maps;
714 /* fill all fd with -1 */
715 memset(obj->map_fds, -1, sizeof(int) * nr_maps);
718 for (i = 0; i < nr_maps; i++) {
719 struct bpf_map_def def;
721 def = *(struct bpf_map_def *)(obj->maps_buf +
722 i * sizeof(struct bpf_map_def));
724 *pfd = bpf_create_map(def.type,
732 pr_warning("failed to create map: %s\n",
734 for (j = 0; j < i; j++)
735 zclose(obj->map_fds[j]);
737 zfree(&obj->map_fds);
740 pr_debug("create map: fd=%d\n", *pfd);
744 zfree(&obj->maps_buf);
745 obj->maps_buf_sz = 0;
750 bpf_program__relocate(struct bpf_program *prog, int *map_fds)
754 if (!prog || !prog->reloc_desc)
757 for (i = 0; i < prog->nr_reloc; i++) {
758 int insn_idx, map_idx;
759 struct bpf_insn *insns = prog->insns;
761 insn_idx = prog->reloc_desc[i].insn_idx;
762 map_idx = prog->reloc_desc[i].map_idx;
764 if (insn_idx >= (int)prog->insns_cnt) {
765 pr_warning("relocation out of range: '%s'\n",
767 return -LIBBPF_ERRNO__RELOC;
769 insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD;
770 insns[insn_idx].imm = map_fds[map_idx];
773 zfree(&prog->reloc_desc);
780 bpf_object__relocate(struct bpf_object *obj)
782 struct bpf_program *prog;
786 for (i = 0; i < obj->nr_programs; i++) {
787 prog = &obj->programs[i];
789 err = bpf_program__relocate(prog, obj->map_fds);
791 pr_warning("failed to relocate '%s'\n",
799 static int bpf_object__collect_reloc(struct bpf_object *obj)
803 if (!obj_elf_valid(obj)) {
804 pr_warning("Internal error: elf object is closed\n");
805 return -LIBBPF_ERRNO__INTERNAL;
808 for (i = 0; i < obj->efile.nr_reloc; i++) {
809 GElf_Shdr *shdr = &obj->efile.reloc[i].shdr;
810 Elf_Data *data = obj->efile.reloc[i].data;
811 int idx = shdr->sh_info;
812 struct bpf_program *prog;
813 size_t nr_maps = obj->maps_buf_sz /
814 sizeof(struct bpf_map_def);
816 if (shdr->sh_type != SHT_REL) {
817 pr_warning("internal error at %d\n", __LINE__);
818 return -LIBBPF_ERRNO__INTERNAL;
821 prog = bpf_object__find_prog_by_idx(obj, idx);
823 pr_warning("relocation failed: no %d section\n",
825 return -LIBBPF_ERRNO__RELOC;
828 err = bpf_program__collect_reloc(prog, nr_maps,
838 load_program(struct bpf_insn *insns, int insns_cnt,
839 char *license, u32 kern_version, int *pfd)
844 if (!insns || !insns_cnt)
847 log_buf = malloc(BPF_LOG_BUF_SIZE);
849 pr_warning("Alloc log buffer for bpf loader error, continue without log\n");
851 ret = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
852 insns_cnt, license, kern_version,
853 log_buf, BPF_LOG_BUF_SIZE);
861 ret = -LIBBPF_ERRNO__LOAD;
862 pr_warning("load bpf program failed: %s\n", strerror(errno));
864 if (log_buf && log_buf[0] != '\0') {
865 ret = -LIBBPF_ERRNO__VERIFY;
866 pr_warning("-- BEGIN DUMP LOG ---\n");
867 pr_warning("\n%s\n", log_buf);
868 pr_warning("-- END LOG --\n");
870 if (insns_cnt >= BPF_MAXINSNS) {
871 pr_warning("Program too large (%d insns), at most %d insns\n",
872 insns_cnt, BPF_MAXINSNS);
873 ret = -LIBBPF_ERRNO__PROG2BIG;
874 } else if (log_buf) {
875 pr_warning("log buffer is empty\n");
876 ret = -LIBBPF_ERRNO__KVER;
886 bpf_program__load(struct bpf_program *prog,
887 char *license, u32 kern_version)
891 err = load_program(prog->insns, prog->insns_cnt,
892 license, kern_version, &fd);
897 pr_warning("failed to load program '%s'\n",
905 bpf_object__load_progs(struct bpf_object *obj)
910 for (i = 0; i < obj->nr_programs; i++) {
911 err = bpf_program__load(&obj->programs[i],
920 static int bpf_object__validate(struct bpf_object *obj)
922 if (obj->kern_version == 0) {
923 pr_warning("%s doesn't provide kernel version\n",
925 return -LIBBPF_ERRNO__KVERSION;
930 static struct bpf_object *
931 __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz)
933 struct bpf_object *obj;
936 if (elf_version(EV_CURRENT) == EV_NONE) {
937 pr_warning("failed to init libelf for %s\n", path);
938 return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
941 obj = bpf_object__new(path, obj_buf, obj_buf_sz);
945 CHECK_ERR(bpf_object__elf_init(obj), err, out);
946 CHECK_ERR(bpf_object__check_endianness(obj), err, out);
947 CHECK_ERR(bpf_object__elf_collect(obj), err, out);
948 CHECK_ERR(bpf_object__collect_reloc(obj), err, out);
949 CHECK_ERR(bpf_object__validate(obj), err, out);
951 bpf_object__elf_finish(obj);
954 bpf_object__close(obj);
958 struct bpf_object *bpf_object__open(const char *path)
960 /* param validation */
964 pr_debug("loading %s\n", path);
966 return __bpf_object__open(path, NULL, 0);
969 struct bpf_object *bpf_object__open_buffer(void *obj_buf,
975 /* param validation */
976 if (!obj_buf || obj_buf_sz <= 0)
980 snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx",
981 (unsigned long)obj_buf,
982 (unsigned long)obj_buf_sz);
983 tmp_name[sizeof(tmp_name) - 1] = '\0';
986 pr_debug("loading object '%s' from buffer\n",
989 return __bpf_object__open(name, obj_buf, obj_buf_sz);
992 int bpf_object__unload(struct bpf_object *obj)
999 for (i = 0; i < obj->nr_map_fds; i++)
1000 zclose(obj->map_fds[i]);
1001 zfree(&obj->map_fds);
1002 obj->nr_map_fds = 0;
1004 for (i = 0; i < obj->nr_programs; i++)
1005 bpf_program__unload(&obj->programs[i]);
1010 int bpf_object__load(struct bpf_object *obj)
1018 pr_warning("object should not be loaded twice\n");
1024 CHECK_ERR(bpf_object__create_maps(obj), err, out);
1025 CHECK_ERR(bpf_object__relocate(obj), err, out);
1026 CHECK_ERR(bpf_object__load_progs(obj), err, out);
1030 bpf_object__unload(obj);
1031 pr_warning("failed to load object '%s'\n", obj->path);
1035 void bpf_object__close(struct bpf_object *obj)
1042 bpf_object__elf_finish(obj);
1043 bpf_object__unload(obj);
1045 zfree(&obj->maps_buf);
1047 if (obj->programs && obj->nr_programs) {
1048 for (i = 0; i < obj->nr_programs; i++)
1049 bpf_program__exit(&obj->programs[i]);
1051 zfree(&obj->programs);
1053 list_del(&obj->list);
1058 bpf_object__next(struct bpf_object *prev)
1060 struct bpf_object *next;
1063 next = list_first_entry(&bpf_objects_list,
1067 next = list_next_entry(prev, list);
1069 /* Empty list is noticed here so don't need checking on entry. */
1070 if (&next->list == &bpf_objects_list)
1077 bpf_object__get_name(struct bpf_object *obj)
1080 return ERR_PTR(-EINVAL);
1085 bpf_object__get_kversion(struct bpf_object *obj)
1089 return obj->kern_version;
1092 struct bpf_program *
1093 bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
1101 return &obj->programs[0];
1103 if (prev->obj != obj) {
1104 pr_warning("error: program handler doesn't match object\n");
1108 idx = (prev - obj->programs) + 1;
1109 if (idx >= obj->nr_programs)
1111 return &obj->programs[idx];
1114 int bpf_program__set_private(struct bpf_program *prog,
1116 bpf_program_clear_priv_t clear_priv)
1118 if (prog->priv && prog->clear_priv)
1119 prog->clear_priv(prog, prog->priv);
1122 prog->clear_priv = clear_priv;
1126 int bpf_program__get_private(struct bpf_program *prog, void **ppriv)
1128 *ppriv = prog->priv;
1132 const char *bpf_program__title(struct bpf_program *prog, bool needs_copy)
1136 title = prog->section_name;
1138 title = strdup(title);
1140 pr_warning("failed to strdup program title\n");
1141 return ERR_PTR(-ENOMEM);
1148 int bpf_program__fd(struct bpf_program *prog)