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c9e208fa93
Adding test that attaches kprobe/kretprobe multi and verifies the ORC stacktrace matches expected functions. Adding bpf_testmod_stacktrace_test function to bpf_testmod kernel module which is called through several functions so we get reliable call path for stacktrace. The test is only for ORC unwinder to keep it simple. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20251104215405.168643-4-jolsa@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
42 lines
824 B
C
42 lines
824 B
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.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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char _license[] SEC("license") = "GPL";
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