libbpf: Add BPF_UPROBE and BPF_URETPROBE macro aliases

Add BPF_UPROBE and BPF_URETPROBE macros, aliased to BPF_KPROBE and
BPF_KRETPROBE, respectively. This makes uprobe-based BPF program code
much less confusing, especially to people new to tracing, at no cost in
terms of maintainability. We'll use this macro in selftests in
subsequent patch.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230120200914.3008030-11-andrii@kernel.org

tools/lib/bpf/bpf_tracing.h

@@ -781,4 +781,11 @@ ____##name(struct pt_regs *ctx, ##args)
 
 #define BPF_KPROBE_SYSCALL BPF_KSYSCALL
 
+/* BPF_UPROBE and BPF_URETPROBE are identical to BPF_KPROBE and BPF_KRETPROBE,
+ * but are named way less confusingly for SEC("uprobe") and SEC("uretprobe")
+ * use cases.
+ */
+#define BPF_UPROBE(name, args...)  BPF_KPROBE(name, ##args)
+#define BPF_URETPROBE(name, args...)  BPF_KRETPROBE(name, ##args)
+
 #endif