feat(ebpf): support Aya framework. (#1070)

* feat(ebpf): support Aya framework.

1. fix the rbpf bug
2. use new Aya template
3. add kprobe related device files and attributes to sysfs

---
Signed-off-by: chenlinfeng <chenlinfeng25@outlook.com>

user/apps/syscall_ebpf/syscall_ebpf-ebpf/src/lib.rs

@@ -0,0 +1,3 @@
+#![no_std]
+
+// This file exists to enable the library target.

user/apps/syscall_ebpf/syscall_ebpf-ebpf/src/main.rs

@@ -0,0 +1,50 @@
+#![no_std]
+#![no_main]
+
+use aya_ebpf::{
+    helpers::bpf_ktime_get_ns,
+    macros::{kprobe, map},
+    maps::HashMap,
+    programs::ProbeContext,
+};
+use aya_log_ebpf::info;
+
+#[kprobe]
+pub fn syscall_ebpf(ctx: ProbeContext) -> u32 {
+    try_syscall_ebpf(ctx).unwrap_or_else(|ret| ret)
+}
+
+fn try_syscall_ebpf(ctx: ProbeContext) -> Result<u32, u32> {
+    let pt_regs = unsafe { &*ctx.regs };
+    // first arg -> rdi
+    // second arg -> rsi
+    // third arg -> rdx
+    // four arg -> rcx
+    let syscall_num = pt_regs.rsi as usize;
+    if syscall_num != 1 {
+        unsafe {
+            if let Some(v) = SYSCALL_LIST.get(&(syscall_num as u32)) {
+                let new_v = *v + 1;
+                SYSCALL_LIST
+                    .insert(&(syscall_num as u32), &new_v, 0)
+                    .unwrap();
+            } else {
+                SYSCALL_LIST.insert(&(syscall_num as u32), &1, 0).unwrap();
+            }
+        }
+        let time = unsafe { bpf_ktime_get_ns() };
+        info!(&ctx, "[{}] invoke syscall {}", time, syscall_num);
+    }
+    Ok(0)
+}
+
+#[map]
+static SYSCALL_LIST: HashMap<u32, u32> = HashMap::<u32, u32>::with_max_entries(1024, 0);
+
+#[cfg(not(test))]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    // we need use this because the verifier will forbid loop
+    unsafe { core::hint::unreachable_unchecked() }
+    // loop{}
+}