f9a7cf6eb1
For BPF_PROG_TYPE_TRACING, the bpf_prog's ctx is an array of u64. This patch borrows the idea from BPF_CALL_x in filter.h to convert a u64 to the arg type of the traced function. The new BPF_TRACE_x has an arg to specify the return type of a bpf_prog. It will be used in the future TCP-ops bpf_prog that may return "void". The new macros are defined in the new header file "bpf_trace_helpers.h". It is under selftests/bpf/ for now. It could be moved to libbpf later after seeing more upcoming non-tracing use cases. The tests are changed to use these new macros also. Hence, the k[s]u8/16/32/64 are no longer needed and they are removed from the bpf_helpers.h. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191123202504.1502696-1-kafai@fb.com
40 lines
728 B
C
40 lines
728 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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#include "bpf_tracing.h"
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#include "bpf_trace_helpers.h"
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SEC("kprobe/__set_task_comm")
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int prog1(struct pt_regs *ctx)
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{
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return 0;
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}
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SEC("kretprobe/__set_task_comm")
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int prog2(struct pt_regs *ctx)
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{
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return 0;
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}
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SEC("raw_tp/task_rename")
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int prog3(struct bpf_raw_tracepoint_args *ctx)
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{
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return 0;
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}
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struct task_struct;
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BPF_TRACE_3("fentry/__set_task_comm", prog4,
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struct task_struct *, tsk, const char *, buf, __u8, exec)
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{
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return 0;
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}
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BPF_TRACE_3("fexit/__set_task_comm", prog5,
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struct task_struct *, tsk, const char *, buf, __u8, exec)
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{
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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