/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ #ifndef __BPF_HELPERS__ #define __BPF_HELPERS__ #define __uint(name, val) int (*name)[val] #define __type(name, val) val *name /* helper macro to print out debug messages */ #define bpf_printk(fmt, ...) \ ({ \ char ____fmt[] = fmt; \ bpf_trace_printk(____fmt, sizeof(____fmt), \ ##__VA_ARGS__); \ }) #ifdef __clang__ /* helper macro to place programs, maps, license in * different sections in elf_bpf file. Section names * are interpreted by elf_bpf loader */ #define SEC(NAME) __attribute__((section(NAME), used)) /* helper functions called from eBPF programs written in C */ static void *(*bpf_map_lookup_elem)(void *map, const void *key) = (void *) BPF_FUNC_map_lookup_elem; static int (*bpf_map_update_elem)(void *map, const void *key, const void *value, unsigned long long flags) = (void *) BPF_FUNC_map_update_elem; static int (*bpf_map_delete_elem)(void *map, const void *key) = (void *) BPF_FUNC_map_delete_elem; static int (*bpf_map_push_elem)(void *map, const void *value, unsigned long long flags) = (void *) BPF_FUNC_map_push_elem; static int (*bpf_map_pop_elem)(void *map, void *value) = (void *) BPF_FUNC_map_pop_elem; static int (*bpf_map_peek_elem)(void *map, void *value) = (void *) BPF_FUNC_map_peek_elem; static int (*bpf_probe_read)(void *dst, int size, const void *unsafe_ptr) = (void *) BPF_FUNC_probe_read; static unsigned long long (*bpf_ktime_get_ns)(void) = (void *) BPF_FUNC_ktime_get_ns; static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = (void *) BPF_FUNC_trace_printk; static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *) BPF_FUNC_tail_call; static unsigned long long (*bpf_get_smp_processor_id)(void) = (void *) BPF_FUNC_get_smp_processor_id; static unsigned long long (*bpf_get_current_pid_tgid)(void) = (void *) BPF_FUNC_get_current_pid_tgid; static unsigned long long (*bpf_get_current_uid_gid)(void) = (void *) BPF_FUNC_get_current_uid_gid; static int (*bpf_get_current_comm)(void *buf, int buf_size) = (void *) BPF_FUNC_get_current_comm; static unsigned long long (*bpf_perf_event_read)(void *map, unsigned long long flags) = (void *) BPF_FUNC_perf_event_read; static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) = (void *) BPF_FUNC_clone_redirect; static int (*bpf_redirect)(int ifindex, int flags) = (void *) BPF_FUNC_redirect; static int (*bpf_redirect_map)(void *map, int key, int flags) = (void *) BPF_FUNC_redirect_map; static int (*bpf_perf_event_output)(void *ctx, void *map, unsigned long long flags, void *data, int size) = (void *) BPF_FUNC_perf_event_output; static int (*bpf_get_stackid)(void *ctx, void *map, int flags) = (void *) BPF_FUNC_get_stackid; static int (*bpf_probe_write_user)(void *dst, const void *src, int size) = (void *) BPF_FUNC_probe_write_user; static int (*bpf_current_task_under_cgroup)(void *map, int index) = (void *) BPF_FUNC_current_task_under_cgroup; static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) = (void *) BPF_FUNC_skb_get_tunnel_key; static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) = (void *) BPF_FUNC_skb_set_tunnel_key; static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) = (void *) BPF_FUNC_skb_get_tunnel_opt; static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) = (void *) BPF_FUNC_skb_set_tunnel_opt; static unsigned long long (*bpf_get_prandom_u32)(void) = (void *) BPF_FUNC_get_prandom_u32; static int (*bpf_xdp_adjust_head)(void *ctx, int offset) = (void *) BPF_FUNC_xdp_adjust_head; static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) = (void *) BPF_FUNC_xdp_adjust_meta; static int (*bpf_get_socket_cookie)(void *ctx) = (void *) BPF_FUNC_get_socket_cookie; static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval, int optlen) = (void *) BPF_FUNC_setsockopt; static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval, int optlen) = (void *) BPF_FUNC_getsockopt; static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) = (void *) BPF_FUNC_sock_ops_cb_flags_set; static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) = (void *) BPF_FUNC_sk_redirect_map; static int (*bpf_sk_redirect_hash)(void *ctx, void *map, void *key, int flags) = (void *) BPF_FUNC_sk_redirect_hash; static int (*bpf_sock_map_update)(void *map, void *key, void *value, unsigned long long flags) = (void *) BPF_FUNC_sock_map_update; static int (*bpf_sock_hash_update)(void *map, void *key, void *value, unsigned long long flags) = (void *) BPF_FUNC_sock_hash_update; static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags, void *buf, unsigned int buf_size) = (void *) BPF_FUNC_perf_event_read_value; static int (*bpf_perf_prog_read_value)(void *ctx, void *buf, unsigned int buf_size) = (void *) BPF_FUNC_perf_prog_read_value; static int (*bpf_override_return)(void *ctx, unsigned long rc) = (void *) BPF_FUNC_override_return; static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) = (void *) BPF_FUNC_msg_redirect_map; static int (*bpf_msg_redirect_hash)(void *ctx, void *map, void *key, int flags) = (void *) BPF_FUNC_msg_redirect_hash; static int (*bpf_msg_apply_bytes)(void *ctx, int len) = (void *) BPF_FUNC_msg_apply_bytes; static int (*bpf_msg_cork_bytes)(void *ctx, int len) = (void *) BPF_FUNC_msg_cork_bytes; static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) = (void *) BPF_FUNC_msg_pull_data; static int (*bpf_msg_push_data)(void *ctx, int start, int end, int flags) = (void *) BPF_FUNC_msg_push_data; static int (*bpf_msg_pop_data)(void *ctx, int start, int cut, int flags) = (void *) BPF_FUNC_msg_pop_data; static int (*bpf_bind)(void *ctx, void *addr, int addr_len) = (void *) BPF_FUNC_bind; static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) = (void *) BPF_FUNC_xdp_adjust_tail; static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state, int size, int flags) = (void *) BPF_FUNC_skb_get_xfrm_state; static int (*bpf_sk_select_reuseport)(void *ctx, void *map, void *key, __u32 flags) = (void *) BPF_FUNC_sk_select_reuseport; static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) = (void *) BPF_FUNC_get_stack; static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params, int plen, __u32 flags) = (void *) BPF_FUNC_fib_lookup; static int (*bpf_lwt_push_encap)(void *ctx, unsigned int type, void *hdr, unsigned int len) = (void *) BPF_FUNC_lwt_push_encap; static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset, void *from, unsigned int len) = (void *) BPF_FUNC_lwt_seg6_store_bytes; static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param, unsigned int param_len) = (void *) BPF_FUNC_lwt_seg6_action; static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset, unsigned int len) = (void *) BPF_FUNC_lwt_seg6_adjust_srh; static int (*bpf_rc_repeat)(void *ctx) = (void *) BPF_FUNC_rc_repeat; static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol, unsigned long long scancode, unsigned int toggle) = (void *) BPF_FUNC_rc_keydown; static unsigned long long (*bpf_get_current_cgroup_id)(void) = (void *) BPF_FUNC_get_current_cgroup_id; static void *(*bpf_get_local_storage)(void *map, unsigned long long flags) = (void *) BPF_FUNC_get_local_storage; static unsigned long long (*bpf_skb_cgroup_id)(void *ctx) = (void *) BPF_FUNC_skb_cgroup_id; static unsigned long long (*bpf_skb_ancestor_cgroup_id)(void *ctx, int level) = (void *) BPF_FUNC_skb_ancestor_cgroup_id; static struct bpf_sock *(*bpf_sk_lookup_tcp)(void *ctx, struct bpf_sock_tuple *tuple, int size, unsigned long long netns_id, unsigned long long flags) = (void *) BPF_FUNC_sk_lookup_tcp; static struct bpf_sock *(*bpf_skc_lookup_tcp)(void *ctx, struct bpf_sock_tuple *tuple, int size, unsigned long long netns_id, unsigned long long flags) = (void *) BPF_FUNC_skc_lookup_tcp; static struct bpf_sock *(*bpf_sk_lookup_udp)(void *ctx, struct bpf_sock_tuple *tuple, int size, unsigned long long netns_id, unsigned long long flags) = (void *) BPF_FUNC_sk_lookup_udp; static int (*bpf_sk_release)(struct bpf_sock *sk) = (void *) BPF_FUNC_sk_release; static int (*bpf_skb_vlan_push)(void *ctx, __be16 vlan_proto, __u16 vlan_tci) = (void *) BPF_FUNC_skb_vlan_push; static int (*bpf_skb_vlan_pop)(void *ctx) = (void *) BPF_FUNC_skb_vlan_pop; static int (*bpf_rc_pointer_rel)(void *ctx, int rel_x, int rel_y) = (void *) BPF_FUNC_rc_pointer_rel; static void (*bpf_spin_lock)(struct bpf_spin_lock *lock) = (void *) BPF_FUNC_spin_lock; static void (*bpf_spin_unlock)(struct bpf_spin_lock *lock) = (void *) BPF_FUNC_spin_unlock; static struct bpf_sock *(*bpf_sk_fullsock)(struct bpf_sock *sk) = (void *) BPF_FUNC_sk_fullsock; static struct bpf_tcp_sock *(*bpf_tcp_sock)(struct bpf_sock *sk) = (void *) BPF_FUNC_tcp_sock; static struct bpf_sock *(*bpf_get_listener_sock)(struct bpf_sock *sk) = (void *) BPF_FUNC_get_listener_sock; static int (*bpf_skb_ecn_set_ce)(void *ctx) = (void *) BPF_FUNC_skb_ecn_set_ce; static int (*bpf_tcp_check_syncookie)(struct bpf_sock *sk, void *ip, int ip_len, void *tcp, int tcp_len) = (void *) BPF_FUNC_tcp_check_syncookie; static int (*bpf_sysctl_get_name)(void *ctx, char *buf, unsigned long long buf_len, unsigned long long flags) = (void *) BPF_FUNC_sysctl_get_name; static int (*bpf_sysctl_get_current_value)(void *ctx, char *buf, unsigned long long buf_len) = (void *) BPF_FUNC_sysctl_get_current_value; static int (*bpf_sysctl_get_new_value)(void *ctx, char *buf, unsigned long long buf_len) = (void *) BPF_FUNC_sysctl_get_new_value; static int (*bpf_sysctl_set_new_value)(void *ctx, const char *buf, unsigned long long buf_len) = (void *) BPF_FUNC_sysctl_set_new_value; static int (*bpf_strtol)(const char *buf, unsigned long long buf_len, unsigned long long flags, long *res) = (void *) BPF_FUNC_strtol; static int (*bpf_strtoul)(const char *buf, unsigned long long buf_len, unsigned long long flags, unsigned long *res) = (void *) BPF_FUNC_strtoul; static void *(*bpf_sk_storage_get)(void *map, struct bpf_sock *sk, void *value, __u64 flags) = (void *) BPF_FUNC_sk_storage_get; static int (*bpf_sk_storage_delete)(void *map, struct bpf_sock *sk) = (void *)BPF_FUNC_sk_storage_delete; static int (*bpf_send_signal)(unsigned sig) = (void *)BPF_FUNC_send_signal; static long long (*bpf_tcp_gen_syncookie)(struct bpf_sock *sk, void *ip, int ip_len, void *tcp, int tcp_len) = (void *) BPF_FUNC_tcp_gen_syncookie; /* llvm builtin functions that eBPF C program may use to * emit BPF_LD_ABS and BPF_LD_IND instructions */ struct sk_buff; unsigned long long load_byte(void *skb, unsigned long long off) asm("llvm.bpf.load.byte"); unsigned long long load_half(void *skb, unsigned long long off) asm("llvm.bpf.load.half"); unsigned long long load_word(void *skb, unsigned long long off) asm("llvm.bpf.load.word"); /* a helper structure used by eBPF C program * to describe map attributes to elf_bpf loader */ struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; unsigned int map_flags; unsigned int inner_map_idx; unsigned int numa_node; }; #else #include #endif #define BPF_ANNOTATE_KV_PAIR(name, type_key, type_val) \ struct ____btf_map_##name { \ type_key key; \ type_val value; \ }; \ struct ____btf_map_##name \ __attribute__ ((section(".maps." #name), used)) \ ____btf_map_##name = { } static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) = (void *) BPF_FUNC_skb_load_bytes; static int (*bpf_skb_load_bytes_relative)(void *ctx, int off, void *to, int len, __u32 start_header) = (void *) BPF_FUNC_skb_load_bytes_relative; static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) = (void *) BPF_FUNC_skb_store_bytes; static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) = (void *) BPF_FUNC_l3_csum_replace; static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) = (void *) BPF_FUNC_l4_csum_replace; static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) = (void *) BPF_FUNC_csum_diff; static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) = (void *) BPF_FUNC_skb_under_cgroup; static int (*bpf_skb_change_head)(void *, int len, int flags) = (void *) BPF_FUNC_skb_change_head; static int (*bpf_skb_pull_data)(void *, int len) = (void *) BPF_FUNC_skb_pull_data; static unsigned int (*bpf_get_cgroup_classid)(void *ctx) = (void *) BPF_FUNC_get_cgroup_classid; static unsigned int (*bpf_get_route_realm)(void *ctx) = (void *) BPF_FUNC_get_route_realm; static int (*bpf_skb_change_proto)(void *ctx, __be16 proto, __u64 flags) = (void *) BPF_FUNC_skb_change_proto; static int (*bpf_skb_change_type)(void *ctx, __u32 type) = (void *) BPF_FUNC_skb_change_type; static unsigned int (*bpf_get_hash_recalc)(void *ctx) = (void *) BPF_FUNC_get_hash_recalc; static unsigned long long (*bpf_get_current_task)(void) = (void *) BPF_FUNC_get_current_task; static int (*bpf_skb_change_tail)(void *ctx, __u32 len, __u64 flags) = (void *) BPF_FUNC_skb_change_tail; static long long (*bpf_csum_update)(void *ctx, __u32 csum) = (void *) BPF_FUNC_csum_update; static void (*bpf_set_hash_invalid)(void *ctx) = (void *) BPF_FUNC_set_hash_invalid; static int (*bpf_get_numa_node_id)(void) = (void *) BPF_FUNC_get_numa_node_id; static int (*bpf_probe_read_str)(void *ctx, __u32 size, const void *unsafe_ptr) = (void *) BPF_FUNC_probe_read_str; static unsigned int (*bpf_get_socket_uid)(void *ctx) = (void *) BPF_FUNC_get_socket_uid; static unsigned int (*bpf_set_hash)(void *ctx, __u32 hash) = (void *) BPF_FUNC_set_hash; static int (*bpf_skb_adjust_room)(void *ctx, __s32 len_diff, __u32 mode, unsigned long long flags) = (void *) BPF_FUNC_skb_adjust_room; /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ #if defined(__TARGET_ARCH_x86) #define bpf_target_x86 #define bpf_target_defined #elif defined(__TARGET_ARCH_s390) #define bpf_target_s390 #define bpf_target_defined #elif defined(__TARGET_ARCH_arm) #define bpf_target_arm #define bpf_target_defined #elif defined(__TARGET_ARCH_arm64) #define bpf_target_arm64 #define bpf_target_defined #elif defined(__TARGET_ARCH_mips) #define bpf_target_mips #define bpf_target_defined #elif defined(__TARGET_ARCH_powerpc) #define bpf_target_powerpc #define bpf_target_defined #elif defined(__TARGET_ARCH_sparc) #define bpf_target_sparc #define bpf_target_defined #else #undef bpf_target_defined #endif /* Fall back to what the compiler says */ #ifndef bpf_target_defined #if defined(__x86_64__) #define bpf_target_x86 #elif defined(__s390__) #define bpf_target_s390 #elif defined(__arm__) #define bpf_target_arm #elif defined(__aarch64__) #define bpf_target_arm64 #elif defined(__mips__) #define bpf_target_mips #elif defined(__powerpc__) #define bpf_target_powerpc #elif defined(__sparc__) #define bpf_target_sparc #endif #endif #if defined(bpf_target_x86) #ifdef __KERNEL__ #define PT_REGS_PARM1(x) ((x)->di) #define PT_REGS_PARM2(x) ((x)->si) #define PT_REGS_PARM3(x) ((x)->dx) #define PT_REGS_PARM4(x) ((x)->cx) #define PT_REGS_PARM5(x) ((x)->r8) #define PT_REGS_RET(x) ((x)->sp) #define PT_REGS_FP(x) ((x)->bp) #define PT_REGS_RC(x) ((x)->ax) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->ip) #else #ifdef __i386__ /* i386 kernel is built with -mregparm=3 */ #define PT_REGS_PARM1(x) ((x)->eax) #define PT_REGS_PARM2(x) ((x)->edx) #define PT_REGS_PARM3(x) ((x)->ecx) #define PT_REGS_PARM4(x) 0 #define PT_REGS_PARM5(x) 0 #define PT_REGS_RET(x) ((x)->esp) #define PT_REGS_FP(x) ((x)->ebp) #define PT_REGS_RC(x) ((x)->eax) #define PT_REGS_SP(x) ((x)->esp) #define PT_REGS_IP(x) ((x)->eip) #else #define PT_REGS_PARM1(x) ((x)->rdi) #define PT_REGS_PARM2(x) ((x)->rsi) #define PT_REGS_PARM3(x) ((x)->rdx) #define PT_REGS_PARM4(x) ((x)->rcx) #define PT_REGS_PARM5(x) ((x)->r8) #define PT_REGS_RET(x) ((x)->rsp) #define PT_REGS_FP(x) ((x)->rbp) #define PT_REGS_RC(x) ((x)->rax) #define PT_REGS_SP(x) ((x)->rsp) #define PT_REGS_IP(x) ((x)->rip) #endif #endif #elif defined(bpf_target_s390) /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ struct pt_regs; #define PT_REGS_S390 const volatile user_pt_regs #define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2]) #define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3]) #define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4]) #define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5]) #define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6]) #define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11]) #define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2]) #define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15]) #define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr) #elif defined(bpf_target_arm) #define PT_REGS_PARM1(x) ((x)->uregs[0]) #define PT_REGS_PARM2(x) ((x)->uregs[1]) #define PT_REGS_PARM3(x) ((x)->uregs[2]) #define PT_REGS_PARM4(x) ((x)->uregs[3]) #define PT_REGS_PARM5(x) ((x)->uregs[4]) #define PT_REGS_RET(x) ((x)->uregs[14]) #define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->uregs[0]) #define PT_REGS_SP(x) ((x)->uregs[13]) #define PT_REGS_IP(x) ((x)->uregs[12]) #elif defined(bpf_target_arm64) /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ struct pt_regs; #define PT_REGS_ARM64 const volatile struct user_pt_regs #define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0]) #define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1]) #define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2]) #define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3]) #define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4]) #define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29]) #define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0]) #define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp) #define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc) #elif defined(bpf_target_mips) #define PT_REGS_PARM1(x) ((x)->regs[4]) #define PT_REGS_PARM2(x) ((x)->regs[5]) #define PT_REGS_PARM3(x) ((x)->regs[6]) #define PT_REGS_PARM4(x) ((x)->regs[7]) #define PT_REGS_PARM5(x) ((x)->regs[8]) #define PT_REGS_RET(x) ((x)->regs[31]) #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->regs[1]) #define PT_REGS_SP(x) ((x)->regs[29]) #define PT_REGS_IP(x) ((x)->cp0_epc) #elif defined(bpf_target_powerpc) #define PT_REGS_PARM1(x) ((x)->gpr[3]) #define PT_REGS_PARM2(x) ((x)->gpr[4]) #define PT_REGS_PARM3(x) ((x)->gpr[5]) #define PT_REGS_PARM4(x) ((x)->gpr[6]) #define PT_REGS_PARM5(x) ((x)->gpr[7]) #define PT_REGS_RC(x) ((x)->gpr[3]) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->nip) #elif defined(bpf_target_sparc) #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0]) #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1]) #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2]) #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3]) #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4]) #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7]) #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0]) #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP]) /* Should this also be a bpf_target check for the sparc case? */ #if defined(__arch64__) #define PT_REGS_IP(x) ((x)->tpc) #else #define PT_REGS_IP(x) ((x)->pc) #endif #endif #if defined(bpf_target_powerpc) #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP #elif defined(bpf_target_sparc) #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP #else #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \ bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \ bpf_probe_read(&(ip), sizeof(ip), \ (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) #endif /* * BPF_CORE_READ abstracts away bpf_probe_read() call and captures offset * relocation for source address using __builtin_preserve_access_index() * built-in, provided by Clang. * * __builtin_preserve_access_index() takes as an argument an expression of * taking an address of a field within struct/union. It makes compiler emit * a relocation, which records BTF type ID describing root struct/union and an * accessor string which describes exact embedded field that was used to take * an address. See detailed description of this relocation format and * semantics in comments to struct bpf_offset_reloc in libbpf_internal.h. * * This relocation allows libbpf to adjust BPF instruction to use correct * actual field offset, based on target kernel BTF type that matches original * (local) BTF, used to record relocation. */ #define BPF_CORE_READ(dst, src) \ bpf_probe_read((dst), sizeof(*(src)), \ __builtin_preserve_access_index(src)) #endif