libbpf: Rewrite btf datasec names starting from '?'

[linux-2.6-microblaze.git] / tools / lib / bpf / features.c

diff --git a/tools/lib/bpf/features.c b/tools/lib/bpf/features.c
index 6b0738a..4e783cc 100644 (file)
--- a/tools/lib/bpf/features.c
+++ b/tools/lib/bpf/features.c
@@ -147,6 +147,25 @@ static int probe_kern_btf_datasec(int token_fd)
                                             strs, sizeof(strs), token_fd));
 }
 
+static int probe_kern_btf_qmark_datasec(int token_fd)
+{
+       static const char strs[] = "\0x\0?.data";
+       /* static int a; */
+       __u32 types[] = {
+               /* int */
+               BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4),  /* [1] */
+               /* VAR x */                                     /* [2] */
+               BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_VAR, 0, 0), 1),
+               BTF_VAR_STATIC,
+               /* DATASEC ?.data */                            /* [3] */
+               BTF_TYPE_ENC(3, BTF_INFO_ENC(BTF_KIND_DATASEC, 0, 1), 4),
+               BTF_VAR_SECINFO_ENC(2, 0, 4),
+       };
+
+       return probe_fd(libbpf__load_raw_btf((char *)types, sizeof(types),
+                                            strs, sizeof(strs), token_fd));
+}
+
 static int probe_kern_btf_float(int token_fd)
 {
        static const char strs[] = "\0float";
@@ -534,6 +553,9 @@ static struct kern_feature_desc {
        [FEAT_ARG_CTX_TAG] = {
                "kernel-side __arg_ctx tag", probe_kern_arg_ctx_tag,
        },
+       [FEAT_BTF_QMARK_DATASEC] = {
+               "BTF DATASEC names starting from '?'", probe_kern_btf_qmark_datasec,
+       },
 };
 
 bool feat_supported(struct kern_feature_cache *cache, enum kern_feature_id feat_id)