mirror/libbpf
1
0
Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-03-29 12:49:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

bpf: sync with latest bpf-next tree (#5)

Browse Source 
sync with latest bpf-next tree.
the include/linux/filter.h is created as libbpf.c tries
to use various insn define macros.

Signed-off-by: Yonghong Song <yhs@fb.com>
This commit is contained in:
yonghong-song
2018-11-26 14:32:21 -08:00
committed by GitHub
parent 319ff2f0f6
commit 556e0a0def
11 changed files with 1173 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
src/btf.h
View File

@@ -6,15 +6,60 @@
#include <linux/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef LIBBPF_API
#define LIBBPF_API __attribute__((visibility("default")))
#endif
#define BTF_ELF_SEC ".BTF"
#define BTF_EXT_ELF_SEC ".BTF.ext"
struct btf;
struct btf_ext;
struct btf_type;
/*
* The .BTF.ext ELF section layout defined as
* struct btf_ext_header
* func_info subsection
*
* The func_info subsection layout:
* record size for struct bpf_func_info in the func_info subsection
* struct btf_sec_func_info for section #1
* a list of bpf_func_info records for section #1
* where struct bpf_func_info mimics one in include/uapi/linux/bpf.h
* but may not be identical
* struct btf_sec_func_info for section #2
* a list of bpf_func_info records for section #2
* ......
*
* Note that the bpf_func_info record size in .BTF.ext may not
* be the same as the one defined in include/uapi/linux/bpf.h.
* The loader should ensure that record_size meets minimum
* requirement and pass the record as is to the kernel. The
* kernel will handle the func_info properly based on its contents.
*/
struct btf_ext_header {
__u16 magic;
__u8 version;
__u8 flags;
__u32 hdr_len;
/* All offsets are in bytes relative to the end of this header */
__u32 func_info_off;
__u32 func_info_len;
};
struct btf_sec_func_info {
__u32 sec_name_off;
__u32 num_func_info;
/* Followed by num_func_info number of bpf func_info records */
__u8 data[0];
};
typedef int (*btf_print_fn_t)(const char *, ...)
__attribute__((format(printf, 1, 2)));
@@ -28,5 +73,19 @@ LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
LIBBPF_API int btf__fd(const struct btf *btf);
LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
LIBBPF_API int btf_get_from_id(__u32 id, struct btf **btf);
struct btf_ext *btf_ext__new(__u8 *data, __u32 size, btf_print_fn_t err_log);
void btf_ext__free(struct btf_ext *btf_ext);
int btf_ext__reloc_init(struct btf *btf, struct btf_ext *btf_ext,
const char *sec_name, void **func_info,
__u32 *func_info_rec_size, __u32 *func_info_len);
int btf_ext__reloc(struct btf *btf, struct btf_ext *btf_ext,
const char *sec_name, __u32 insns_cnt, void **func_info,
__u32 *func_info_len);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* __LIBBPF_BTF_H */