Add arg_flags for additional information about arguments in btf_func_model.
Currently, only whether an argument is a structure or not is recorded.
Such information will be used in arch specific function
arch_prepare_bpf_trampoline() to prepare argument access properly
in trampoline.
Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
include/linux/bpf.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index a627a02cf8ab..2d3099fb5a0a 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -726,10 +726,14 @@ enum bpf_cgroup_storage_type {
*/
#define MAX_BPF_FUNC_REG_ARGS 5
+/* The argument is a structure. */
+#define BTF_FMODEL_STRUCT_ARG BIT(0)
+
struct btf_func_model {
u8 ret_size;
u8 nr_args;
u8 arg_size[MAX_BPF_FUNC_ARGS];
+ u8 arg_flags[MAX_BPF_FUNC_ARGS];
};
/* Restore arguments before returning from trampoline to let original function
--
2.30.2
