1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2018 Facebook 3 4 #include <vmlinux.h> 5 #include <bpf/bpf_helpers.h> 6 #include <bpf/bpf_tracing.h> 7 8 #ifndef PERF_MAX_STACK_DEPTH 9 #define PERF_MAX_STACK_DEPTH 127 10 #endif 11 12 typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH]; 13 14 struct { 15 __uint(type, BPF_MAP_TYPE_STACK_TRACE); 16 __uint(max_entries, 16384); 17 __type(key, __u32); 18 __type(value, stack_trace_t); 19 } stackmap SEC(".maps"); 20 21 extern bool CONFIG_UNWINDER_ORC __kconfig __weak; 22 23 /* 24 * This function is here to have CONFIG_UNWINDER_ORC 25 * used and added to object BTF. 26 */ unused(void)27int unused(void) 28 { 29 return CONFIG_UNWINDER_ORC ? 0 : 1; 30 } 31 32 __u32 stack_key; 33 34 SEC("kprobe.multi") kprobe_multi_test(struct pt_regs * ctx)35int kprobe_multi_test(struct pt_regs *ctx) 36 { 37 stack_key = bpf_get_stackid(ctx, &stackmap, 0); 38 return 0; 39 } 40 41 SEC("raw_tp/bpf_testmod_test_read") rawtp_test(void * ctx)42int rawtp_test(void *ctx) 43 { 44 /* Skip ebpf program entry in the stack. */ 45 stack_key = bpf_get_stackid(ctx, &stackmap, 0); 46 return 0; 47 } 48 49 char _license[] SEC("license") = "GPL"; 50