1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef _LINUX_BTF_IDS_H
  4#define _LINUX_BTF_IDS_H
  5
  6#ifdef CONFIG_DEBUG_INFO_BTF
  7
  8#include <linux/compiler.h> /* for __PASTE */
  9
 10/*
 11 * Following macros help to define lists of BTF IDs placed
 12 * in .BTF_ids section. They are initially filled with zeros
 13 * (during compilation) and resolved later during the
 14 * linking phase by resolve_btfids tool.
 15 *
 16 * Any change in list layout must be reflected in resolve_btfids
 17 * tool logic.
 18 */
 19
 20#define BTF_IDS_SECTION ".BTF_ids"
 21
 22#define ____BTF_ID(symbol)				\
 23asm(							\
 24".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
 25".local " #symbol " ;                          \n"	\
 26".type  " #symbol ", STT_OBJECT;               \n"	\
 27".size  " #symbol ", 4;                        \n"	\
 28#symbol ":                                     \n"	\
 29".zero 4                                       \n"	\
 30".popsection;                                  \n");
 31
 32#define __BTF_ID(symbol) \
 33	____BTF_ID(symbol)
 34
 35#define __ID(prefix) \
 36	__PASTE(prefix, __COUNTER__)
 37
 38/*
 39 * The BTF_ID defines unique symbol for each ID pointing
 40 * to 4 zero bytes.
 41 */
 42#define BTF_ID(prefix, name) \
 43	__BTF_ID(__ID(__BTF_ID__##prefix##__##name##__))
 44
 45/*
 46 * The BTF_ID_LIST macro defines pure (unsorted) list
 47 * of BTF IDs, with following layout:
 48 *
 49 * BTF_ID_LIST(list1)
 50 * BTF_ID(type1, name1)
 51 * BTF_ID(type2, name2)
 52 *
 53 * list1:
 54 * __BTF_ID__type1__name1__1:
 55 * .zero 4
 56 * __BTF_ID__type2__name2__2:
 57 * .zero 4
 58 *
 59 */
 60#define __BTF_ID_LIST(name, scope)			\
 61asm(							\
 62".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
 63"." #scope " " #name ";                        \n"	\
 64#name ":;                                      \n"	\
 65".popsection;                                  \n");	\
 66
 67#define BTF_ID_LIST(name)				\
 68__BTF_ID_LIST(name, local)				\
 69extern u32 name[];
 70
 71#define BTF_ID_LIST_GLOBAL(name)			\
 72__BTF_ID_LIST(name, globl)
 73
 74/*
 75 * The BTF_ID_UNUSED macro defines 4 zero bytes.
 76 * It's used when we want to define 'unused' entry
 77 * in BTF_ID_LIST, like:
 78 *
 79 *   BTF_ID_LIST(bpf_skb_output_btf_ids)
 80 *   BTF_ID(struct, sk_buff)
 81 *   BTF_ID_UNUSED
 82 *   BTF_ID(struct, task_struct)
 83 */
 84
 85#define BTF_ID_UNUSED					\
 86asm(							\
 87".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
 88".zero 4                                       \n"	\
 89".popsection;                                  \n");
 90
 91#else
 92
 93#define BTF_ID_LIST(name) static u32 name[5];
 94#define BTF_ID(prefix, name)
 95#define BTF_ID_UNUSED
 96#define BTF_ID_LIST_GLOBAL(name) u32 name[1];
 97
 98#endif /* CONFIG_DEBUG_INFO_BTF */
 99
100#ifdef CONFIG_NET
101/* Define a list of socket types which can be the argument for
102 * skc_to_*_sock() helpers. All these sockets should have
103 * sock_common as the first argument in its memory layout.
104 */
105#define BTF_SOCK_TYPE_xxx \
106	BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET, inet_sock)			\
107	BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_CONN, inet_connection_sock)	\
108	BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_REQ, inet_request_sock)	\
109	BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock)	\
110	BTF_SOCK_TYPE(BTF_SOCK_TYPE_REQ, request_sock)			\
111	BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK, sock)				\
112	BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK_COMMON, sock_common)		\
113	BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP, tcp_sock)			\
114	BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_REQ, tcp_request_sock)		\
115	BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock)		\
116	BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock)			\
117	BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock)			\
118	BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock)
119
120enum {
121#define BTF_SOCK_TYPE(name, str) name,
122BTF_SOCK_TYPE_xxx
123#undef BTF_SOCK_TYPE
124MAX_BTF_SOCK_TYPE,
125};
126
127extern u32 btf_sock_ids[];
128#endif
129
130#endif