sys/linux: describe new BTF types

Describe four new BTF types introduced in commits [1, 2, 3, 4]
upstream. Note BTF_KIND_TAG was later renamed to BTF_KIND_DECL_TAG.
These four types are also described in the documentation at [5].

1 - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b1828f0b04828
2 - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b5ea834dde6b6
3 - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c42d2fa4eeab
4 - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6089fb325cf73
5 - https://docs.kernel.org/bpf/btf.html#btf-kind-float
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/sys/linux/bpf.txt b/sys/linux/bpf.txt
index 9f856d70c..2f4a7bd50 100644
--- a/sys/linux/bpf.txt
+++ b/sys/linux/bpf.txt
@@ -671,6 +671,10 @@ btf_type [
 	func_proto	btf_type_func_proto
 	var		btf_type_var
 	datasec		btf_type_datasec
+	float		btf_type_float
+	decl_tag	btf_type_decl_tag
+	type_tag	btf_type_type_tag
+	enum64		btf_type_enum64
 ] [varlen]
 
 btf_type_int {
@@ -797,6 +801,52 @@ btf_var_secinfo {
 	size	int32
 }
 
+btf_float_size = 2, 4, 8, 12, 16
+
+btf_type_float {
+	name_off	btf_name_off
+	info_vlen	const[0, int16]
+	info_pad	const[0, int8]
+	info_typ	const[BTF_KIND_FLOAT, int8]
+	size		flags[btf_float_size, int32]
+}
+
+btf_type_decl_tag {
+	name_off	btf_name_off
+	info_vlen	const[0, int16]
+	info_pad	const[0, int8]
+	info_typ	const[BTF_KIND_DECL_TAG, int8]
+	type		btf_type_id
+# -1 or the index of a struct field or function argument.
+	component_idx	int32[-1:10]
+}
+
+btf_type_type_tag {
+	name_off	btf_name_off
+	info_vlen	const[0, int16]
+	info_pad	const[0, int8]
+	info_typ	const[BTF_KIND_TYPE_TAG, int8]
+	type		btf_type_id
+}
+
+btf_enum64_sizes = 1, 2, 4, 8
+
+btf_type_enum64 {
+	name_off	btf_name_off
+	info_vlen	len[enum64, int16]
+	info_pad	const[0, int8]
+	info_typ	const[BTF_KIND_ENUM64, int8:7]
+	info_kflag	int8:1
+	size		flags[btf_enum64_sizes, int32]
+	enum64		array[btf_enum64]
+}
+
+btf_enum64 {
+	name_off	btf_name_off
+	val_lo32	int32
+	val_hi32	int32
+}
+
 bpf_btf_strings {
 	z0	const[0, int8]
 	data	array[flags[bpf_btf_strings_elem, int8]]