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Add syscall-specific variant of BPF_KPROBE named BPF_KPROBE_SYSCALL ([0]).
The new macro hides the underlying way of getting syscall input arguments.
With the new macro, the following code:
SEC("kprobe/__x64_sys_close")
int BPF_KPROBE(do_sys_close, struct pt_regs *regs)
{
int fd;
fd = PT_REGS_PARM1_CORE(regs);
/* do something with fd */
}
can be written as:
SEC("kprobe/__x64_sys_close")
int BPF_KPROBE_SYSCALL(do_sys_close, int fd)
{
/* do something with fd */
}
[0] Closes: https://github.com/libbpf/libbpf/issues/425
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220207143134.2977852-2-hengqi.chen@gmail.com
816ae10955