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e5d532be4a
Adding test that attaches fentry/fexitand verifies the ORC stacktrace matches expected functions. The test is only for ORC unwinder to keep it simple. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260126211837.472802-6-jolsa@kernel.org
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#ifndef PERF_MAX_STACK_DEPTH
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#define PERF_MAX_STACK_DEPTH 127
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#endif
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typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH];
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struct {
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__uint(type, BPF_MAP_TYPE_STACK_TRACE);
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__uint(max_entries, 16384);
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__type(key, __u32);
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__type(value, stack_trace_t);
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} stackmap SEC(".maps");
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extern bool CONFIG_UNWINDER_ORC __kconfig __weak;
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/*
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* This function is here to have CONFIG_UNWINDER_ORC
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* used and added to object BTF.
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*/
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int unused(void)
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{
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return CONFIG_UNWINDER_ORC ? 0 : 1;
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}
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__u32 stack_key;
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SEC("kprobe")
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int kprobe_test(struct pt_regs *ctx)
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{
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stack_key = bpf_get_stackid(ctx, &stackmap, 0);
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return 0;
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}
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SEC("kprobe.multi")
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int kprobe_multi_test(struct pt_regs *ctx)
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{
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stack_key = bpf_get_stackid(ctx, &stackmap, 0);
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return 0;
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}
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SEC("raw_tp/bpf_testmod_test_read")
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int rawtp_test(void *ctx)
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{
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/* Skip ebpf program entry in the stack. */
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stack_key = bpf_get_stackid(ctx, &stackmap, 0);
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return 0;
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}
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SEC("fentry/bpf_testmod_stacktrace_test")
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int fentry_test(struct pt_regs *ctx)
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{
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/*
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* Skip 2 bpf_program/trampoline stack entries:
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* - bpf_prog_bd1f7a949f55fb03_fentry_test
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* - bpf_trampoline_182536277701
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*/
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stack_key = bpf_get_stackid(ctx, &stackmap, 2);
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return 0;
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}
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SEC("fexit/bpf_testmod_stacktrace_test")
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int fexit_test(struct pt_regs *ctx)
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{
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/* Skip 2 bpf_program/trampoline stack entries, check fentry_test. */
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stack_key = bpf_get_stackid(ctx, &stackmap, 2);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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