39f8dc43b7
Now that u[ret]probes can use name-based specification, it makes
sense to add support for auto-attach based on SEC() definition.
The format proposed is
SEC("u[ret]probe/binary:[raw_offset|[function_name[+offset]]")
For example, to trace malloc() in libc:
SEC("uprobe/libc.so.6:malloc")
...or to trace function foo2 in /usr/bin/foo:
SEC("uprobe//usr/bin/foo:foo2")
Auto-attach is done for all tasks (pid -1). prog can be an absolute
path or simply a program/library name; in the latter case, we use
PATH/LD_LIBRARY_PATH to resolve the full path, falling back to
standard locations (/usr/bin:/usr/sbin or /usr/lib64:/usr/lib) if
the file is not found via environment-variable specified locations.
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1648654000-21758-4-git-send-email-alan.maguire@oracle.com
62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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#include <linux/bpf.h>
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#include <asm/unistd.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_misc.h"
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char _license[] SEC("license") = "GPL";
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long hits = 0;
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SEC("tp/syscalls/sys_enter_getpgid")
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int bench_trigger_tp(void *ctx)
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{
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__sync_add_and_fetch(&hits, 1);
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return 0;
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}
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SEC("raw_tp/sys_enter")
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int BPF_PROG(bench_trigger_raw_tp, struct pt_regs *regs, long id)
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{
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if (id == __NR_getpgid)
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__sync_add_and_fetch(&hits, 1);
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return 0;
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}
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SEC("kprobe/" SYS_PREFIX "sys_getpgid")
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int bench_trigger_kprobe(void *ctx)
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{
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__sync_add_and_fetch(&hits, 1);
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return 0;
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}
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SEC("fentry/" SYS_PREFIX "sys_getpgid")
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int bench_trigger_fentry(void *ctx)
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{
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__sync_add_and_fetch(&hits, 1);
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return 0;
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}
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SEC("fentry.s/" SYS_PREFIX "sys_getpgid")
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int bench_trigger_fentry_sleep(void *ctx)
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{
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__sync_add_and_fetch(&hits, 1);
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return 0;
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}
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SEC("fmod_ret/" SYS_PREFIX "sys_getpgid")
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int bench_trigger_fmodret(void *ctx)
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{
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__sync_add_and_fetch(&hits, 1);
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return -22;
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}
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SEC("uprobe")
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int bench_trigger_uprobe(void *ctx)
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{
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__sync_add_and_fetch(&hits, 1);
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return 0;
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}
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