alistair23-linux/samples/bpf/trace_common.h

// SPDX-License-Identifier: GPL-2.0
#ifndef __TRACE_COMMON_H
#define __TRACE_COMMON_H

#ifdef __x86_64__
#define SYSCALL(SYS) "__x64_" __stringify(SYS)
#elif defined(__s390x__)
#define SYSCALL(SYS) "__s390x_" __stringify(SYS)
#else
#define SYSCALL(SYS)  __stringify(SYS)
#endif

#endif
samples, bpf: Refactor kprobe tracing user progs with libbpf Currently, the kprobe BPF program attachment method for bpf_load is quite old. The implementation of bpf_load "directly" controls and manages(create, delete) the kprobe events of DEBUGFS. On the other hand, using using the libbpf automatically manages the kprobe event. (under bpf_link interface) By calling bpf_program__attach(_kprobe) in libbpf, the corresponding kprobe is created and the BPF program will be attached to this kprobe. To remove this, by simply invoking bpf_link__destroy will clean up the event. This commit refactors kprobe tracing programs (tracex{1~7}_user.c) with libbpf using bpf_link interface and bpf_program__attach. tracex2_kern.c, which tracks system calls (sys_*), has been modified to append prefix depending on architecture. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200516040608.1377876-3-danieltimlee@gmail.com 2020-05-15 22:06:05 -06:00			`// SPDX-License-Identifier: GPL-2.0`
			`#ifndef __TRACE_COMMON_H`
			`#define __TRACE_COMMON_H`

			`#ifdef __x86_64__`
			`#define SYSCALL(SYS) "__x64_" __stringify(SYS)`
			`#elif defined(__s390x__)`
			`#define SYSCALL(SYS) "__s390x_" __stringify(SYS)`
			`#else`
			`#define SYSCALL(SYS) __stringify(SYS)`
			`#endif`

			`#endif`