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-rw-r--r--include/linux/btf_ids.h187
1 files changed, 187 insertions, 0 deletions
diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
new file mode 100644
index 000000000..eca91e7a4
--- /dev/null
+++ b/include/linux/btf_ids.h
@@ -0,0 +1,187 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _LINUX_BTF_IDS_H
+#define _LINUX_BTF_IDS_H
+
+struct btf_id_set {
+ u32 cnt;
+ u32 ids[];
+};
+
+#ifdef CONFIG_DEBUG_INFO_BTF
+
+#include <linux/compiler.h> /* for __PASTE */
+
+/*
+ * Following macros help to define lists of BTF IDs placed
+ * in .BTF_ids section. They are initially filled with zeros
+ * (during compilation) and resolved later during the
+ * linking phase by resolve_btfids tool.
+ *
+ * Any change in list layout must be reflected in resolve_btfids
+ * tool logic.
+ */
+
+#define BTF_IDS_SECTION ".BTF_ids"
+
+#define ____BTF_ID(symbol) \
+asm( \
+".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
+".local " #symbol " ; \n" \
+".type " #symbol ", STT_OBJECT; \n" \
+".size " #symbol ", 4; \n" \
+#symbol ": \n" \
+".zero 4 \n" \
+".popsection; \n");
+
+#define __BTF_ID(symbol) \
+ ____BTF_ID(symbol)
+
+#define __ID(prefix) \
+ __PASTE(__PASTE(prefix, __COUNTER__), __LINE__)
+
+/*
+ * The BTF_ID defines unique symbol for each ID pointing
+ * to 4 zero bytes.
+ */
+#define BTF_ID(prefix, name) \
+ __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__))
+
+/*
+ * The BTF_ID_LIST macro defines pure (unsorted) list
+ * of BTF IDs, with following layout:
+ *
+ * BTF_ID_LIST(list1)
+ * BTF_ID(type1, name1)
+ * BTF_ID(type2, name2)
+ *
+ * list1:
+ * __BTF_ID__type1__name1__1:
+ * .zero 4
+ * __BTF_ID__type2__name2__2:
+ * .zero 4
+ *
+ */
+#define __BTF_ID_LIST(name, scope) \
+asm( \
+".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
+"." #scope " " #name "; \n" \
+#name ":; \n" \
+".popsection; \n");
+
+#define BTF_ID_LIST(name) \
+__BTF_ID_LIST(name, local) \
+extern u32 name[];
+
+#define BTF_ID_LIST_GLOBAL(name) \
+__BTF_ID_LIST(name, globl)
+
+/* The BTF_ID_LIST_SINGLE macro defines a BTF_ID_LIST with
+ * a single entry.
+ */
+#define BTF_ID_LIST_SINGLE(name, prefix, typename) \
+ BTF_ID_LIST(name) \
+ BTF_ID(prefix, typename)
+
+/*
+ * The BTF_ID_UNUSED macro defines 4 zero bytes.
+ * It's used when we want to define 'unused' entry
+ * in BTF_ID_LIST, like:
+ *
+ * BTF_ID_LIST(bpf_skb_output_btf_ids)
+ * BTF_ID(struct, sk_buff)
+ * BTF_ID_UNUSED
+ * BTF_ID(struct, task_struct)
+ */
+
+#define BTF_ID_UNUSED \
+asm( \
+".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
+".zero 4 \n" \
+".popsection; \n");
+
+/*
+ * The BTF_SET_START/END macros pair defines sorted list of
+ * BTF IDs plus its members count, with following layout:
+ *
+ * BTF_SET_START(list)
+ * BTF_ID(type1, name1)
+ * BTF_ID(type2, name2)
+ * BTF_SET_END(list)
+ *
+ * __BTF_ID__set__list:
+ * .zero 4
+ * list:
+ * __BTF_ID__type1__name1__3:
+ * .zero 4
+ * __BTF_ID__type2__name2__4:
+ * .zero 4
+ *
+ */
+#define __BTF_SET_START(name, scope) \
+asm( \
+".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
+"." #scope " __BTF_ID__set__" #name "; \n" \
+"__BTF_ID__set__" #name ":; \n" \
+".zero 4 \n" \
+".popsection; \n");
+
+#define BTF_SET_START(name) \
+__BTF_ID_LIST(name, local) \
+__BTF_SET_START(name, local)
+
+#define BTF_SET_START_GLOBAL(name) \
+__BTF_ID_LIST(name, globl) \
+__BTF_SET_START(name, globl)
+
+#define BTF_SET_END(name) \
+asm( \
+".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
+".size __BTF_ID__set__" #name ", .-" #name " \n" \
+".popsection; \n"); \
+extern struct btf_id_set name;
+
+#else
+
+#define BTF_ID_LIST(name) static u32 name[5];
+#define BTF_ID(prefix, name)
+#define BTF_ID_UNUSED
+#define BTF_ID_LIST_GLOBAL(name) u32 name[1];
+#define BTF_ID_LIST_SINGLE(name, prefix, typename) static u32 name[1];
+#define BTF_SET_START(name) static struct btf_id_set name = { 0 };
+#define BTF_SET_START_GLOBAL(name) static struct btf_id_set name = { 0 };
+#define BTF_SET_END(name)
+
+#endif /* CONFIG_DEBUG_INFO_BTF */
+
+#ifdef CONFIG_NET
+/* Define a list of socket types which can be the argument for
+ * skc_to_*_sock() helpers. All these sockets should have
+ * sock_common as the first argument in its memory layout.
+ */
+#define BTF_SOCK_TYPE_xxx \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET, inet_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_CONN, inet_connection_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_REQ, inet_request_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_REQ, request_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK, sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK_COMMON, sock_common) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP, tcp_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_REQ, tcp_request_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock) \
+ BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock)
+
+enum {
+#define BTF_SOCK_TYPE(name, str) name,
+BTF_SOCK_TYPE_xxx
+#undef BTF_SOCK_TYPE
+MAX_BTF_SOCK_TYPE,
+};
+
+extern u32 btf_sock_ids[];
+#endif
+
+#endif