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authorMartin KaFai Lau <kafai@fb.com>2018-11-19 15:29:08 -0800
committerAlexei Starovoitov <ast@kernel.org>2018-11-20 10:54:38 -0800
commit2667a2626f4da370409c2830552f6e8c8b8c41e2 (patch)
treec6eba2292a81ead78b2c48075c8f7eb75588a172 /include/uapi/linux/btf.h
parentb47a0bd23e34022aa0d4b812fcebe85cb0c54d49 (diff)
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bpf: btf: Add BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO
This patch adds BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO to support the function debug info. BTF_KIND_FUNC_PROTO must not have a name (i.e. !t->name_off) and it is followed by >= 0 'struct bpf_param' objects to describe the function arguments. The BTF_KIND_FUNC must have a valid name and it must refer back to a BTF_KIND_FUNC_PROTO. The above is the conclusion after the discussion between Edward Cree, Alexei, Daniel, Yonghong and Martin. By combining BTF_KIND_FUNC and BTF_LIND_FUNC_PROTO, a complete function signature can be obtained. It will be used in the later patches to learn the function signature of a running bpf program. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/uapi/linux/btf.h')
-rw-r--r--include/uapi/linux/btf.h18
1 files changed, 15 insertions, 3 deletions
diff --git a/include/uapi/linux/btf.h b/include/uapi/linux/btf.h
index 972265f32871..14f66948fc95 100644
--- a/include/uapi/linux/btf.h
+++ b/include/uapi/linux/btf.h
@@ -40,7 +40,8 @@ struct btf_type {
/* "size" is used by INT, ENUM, STRUCT and UNION.
* "size" tells the size of the type it is describing.
*
- * "type" is used by PTR, TYPEDEF, VOLATILE, CONST and RESTRICT.
+ * "type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT,
+ * FUNC and FUNC_PROTO.
* "type" is a type_id referring to another type.
*/
union {
@@ -64,8 +65,10 @@ struct btf_type {
#define BTF_KIND_VOLATILE 9 /* Volatile */
#define BTF_KIND_CONST 10 /* Const */
#define BTF_KIND_RESTRICT 11 /* Restrict */
-#define BTF_KIND_MAX 11
-#define NR_BTF_KINDS 12
+#define BTF_KIND_FUNC 12 /* Function */
+#define BTF_KIND_FUNC_PROTO 13 /* Function Proto */
+#define BTF_KIND_MAX 13
+#define NR_BTF_KINDS 14
/* For some specific BTF_KIND, "struct btf_type" is immediately
* followed by extra data.
@@ -110,4 +113,13 @@ struct btf_member {
__u32 offset; /* offset in bits */
};
+/* BTF_KIND_FUNC_PROTO is followed by multiple "struct btf_param".
+ * The exact number of btf_param is stored in the vlen (of the
+ * info in "struct btf_type").
+ */
+struct btf_param {
+ __u32 name_off;
+ __u32 type;
+};
+
#endif /* _UAPI__LINUX_BTF_H__ */
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