Add struct argument information in btf_func_model and 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 | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 20c26aed7896..173b42cf3940 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -726,10 +726,19 @@ enum bpf_cgroup_storage_type {
*/
#define MAX_BPF_FUNC_REG_ARGS 5
+/* The maximum number of struct arguments a single function may have. */
+#define MAX_BPF_FUNC_STRUCT_ARGS 2
+
struct btf_func_model {
u8 ret_size;
u8 nr_args;
u8 arg_size[MAX_BPF_FUNC_ARGS];
+ /* The struct_arg_idx should be in increasing order like (0, 2, ...).
+ * The struct_arg_bsize encodes the struct field byte size
+ * for the corresponding struct argument index.
+ */
+ u8 struct_arg_idx[MAX_BPF_FUNC_STRUCT_ARGS];
+ u8 struct_arg_bsize[MAX_BPF_FUNC_STRUCT_ARGS];
};
/* Restore arguments before returning from trampoline to let original function
--
2.30.2
