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authorKumar Kartikeya Dwivedi <memxor@gmail.com>2022-07-21 16:42:34 +0300
committerAlexei Starovoitov <ast@kernel.org>2022-07-22 06:59:42 +0300
commitef2c6f370a637e6f84c813f31fe0ebb4ced2ed69 (patch)
tree601d236a073a69d95a1660be7801b053408fa530 /tools/bpf/resolve_btfids
parentab21d6063c01180a8e9b22a37b847e5819525d9f (diff)
downloadlinux-ef2c6f370a637e6f84c813f31fe0ebb4ced2ed69.tar.xz
tools/resolve_btfids: Add support for 8-byte BTF sets
A flag is a 4-byte symbol that may follow a BTF ID in a set8. This is used in the kernel to tag kfuncs in BTF sets with certain flags. Add support to adjust the sorting code so that it passes size as 8 bytes for 8-byte BTF sets. Cc: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20220721134245.2450-3-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/bpf/resolve_btfids')
-rw-r--r--tools/bpf/resolve_btfids/main.c40
1 files changed, 34 insertions, 6 deletions
diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index 5d26f3c6f918..80cd7843c677 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -45,6 +45,19 @@
* .zero 4
* __BTF_ID__func__vfs_fallocate__4:
* .zero 4
+ *
+ * set8 - store symbol size into first 4 bytes and sort following
+ * ID list
+ *
+ * __BTF_ID__set8__list:
+ * .zero 8
+ * list:
+ * __BTF_ID__func__vfs_getattr__3:
+ * .zero 4
+ * .word (1 << 0) | (1 << 2)
+ * __BTF_ID__func__vfs_fallocate__5:
+ * .zero 4
+ * .word (1 << 3) | (1 << 1) | (1 << 2)
*/
#define _GNU_SOURCE
@@ -72,6 +85,7 @@
#define BTF_TYPEDEF "typedef"
#define BTF_FUNC "func"
#define BTF_SET "set"
+#define BTF_SET8 "set8"
#define ADDR_CNT 100
@@ -84,6 +98,7 @@ struct btf_id {
};
int addr_cnt;
bool is_set;
+ bool is_set8;
Elf64_Addr addr[ADDR_CNT];
};
@@ -231,14 +246,14 @@ static char *get_id(const char *prefix_end)
return id;
}
-static struct btf_id *add_set(struct object *obj, char *name)
+static struct btf_id *add_set(struct object *obj, char *name, bool is_set8)
{
/*
* __BTF_ID__set__name
* name = ^
* id = ^
*/
- char *id = name + sizeof(BTF_SET "__") - 1;
+ char *id = name + (is_set8 ? sizeof(BTF_SET8 "__") : sizeof(BTF_SET "__")) - 1;
int len = strlen(name);
if (id >= name + len) {
@@ -444,9 +459,21 @@ static int symbols_collect(struct object *obj)
} else if (!strncmp(prefix, BTF_FUNC, sizeof(BTF_FUNC) - 1)) {
obj->nr_funcs++;
id = add_symbol(&obj->funcs, prefix, sizeof(BTF_FUNC) - 1);
+ /* set8 */
+ } else if (!strncmp(prefix, BTF_SET8, sizeof(BTF_SET8) - 1)) {
+ id = add_set(obj, prefix, true);
+ /*
+ * SET8 objects store list's count, which is encoded
+ * in symbol's size, together with 'cnt' field hence
+ * that - 1.
+ */
+ if (id) {
+ id->cnt = sym.st_size / sizeof(uint64_t) - 1;
+ id->is_set8 = true;
+ }
/* set */
} else if (!strncmp(prefix, BTF_SET, sizeof(BTF_SET) - 1)) {
- id = add_set(obj, prefix);
+ id = add_set(obj, prefix, false);
/*
* SET objects store list's count, which is encoded
* in symbol's size, together with 'cnt' field hence
@@ -571,7 +598,8 @@ static int id_patch(struct object *obj, struct btf_id *id)
int *ptr = data->d_buf;
int i;
- if (!id->id && !id->is_set)
+ /* For set, set8, id->id may be 0 */
+ if (!id->id && !id->is_set && !id->is_set8)
pr_err("WARN: resolve_btfids: unresolved symbol %s\n", id->name);
for (i = 0; i < id->addr_cnt; i++) {
@@ -643,13 +671,13 @@ static int sets_patch(struct object *obj)
}
idx = idx / sizeof(int);
- base = &ptr[idx] + 1;
+ base = &ptr[idx] + (id->is_set8 ? 2 : 1);
cnt = ptr[idx];
pr_debug("sorting addr %5lu: cnt %6d [%s]\n",
(idx + 1) * sizeof(int), cnt, id->name);
- qsort(base, cnt, sizeof(int), cmp_id);
+ qsort(base, cnt, id->is_set8 ? sizeof(uint64_t) : sizeof(int), cmp_id);
next = rb_next(next);
}