feat(ebpf): add x86_64 eBPF JIT backend

os/StarryOS/kernel/src/ebpf/bpf_insn.rs

@@ -0,0 +1,86 @@
+pub const BPF_LD: u8 = 0x00;
+pub const BPF_LDX: u8 = 0x01;
+pub const BPF_ST: u8 = 0x02;
+pub const BPF_STX: u8 = 0x03;
+pub const BPF_ALU: u8 = 0x04;
+pub const BPF_JMP: u8 = 0x05;
+pub const BPF_JMP32: u8 = 0x06;
+pub const BPF_ALU64: u8 = 0x07;
+
+pub const BPF_W: u8 = 0x00;
+pub const BPF_H: u8 = 0x08;
+pub const BPF_B: u8 = 0x10;
+pub const BPF_DW: u8 = 0x18;
+
+pub const BPF_IMM: u8 = 0x00;
+pub const BPF_MEM: u8 = 0x60;
+
+pub const BPF_ADD: u8 = 0x00;
+pub const BPF_SUB: u8 = 0x10;
+pub const BPF_MUL: u8 = 0x20;
+pub const BPF_DIV: u8 = 0x30;
+pub const BPF_OR: u8 = 0x40;
+pub const BPF_AND: u8 = 0x50;
+pub const BPF_LSH: u8 = 0x60;
+pub const BPF_RSH: u8 = 0x70;
+pub const BPF_NEG: u8 = 0x80;
+pub const BPF_MOD: u8 = 0x90;
+pub const BPF_XOR: u8 = 0xa0;
+pub const BPF_MOV: u8 = 0xb0;
+pub const BPF_ARSH: u8 = 0xc0;
+pub const BPF_END: u8 = 0xd0;
+
+pub const BPF_JA: u8 = 0x00;
+pub const BPF_EXIT: u8 = 0x90;
+pub const BPF_JEQ: u8 = 0x10;
+pub const BPF_JGT: u8 = 0x20;
+pub const BPF_JGE: u8 = 0x30;
+pub const BPF_JSET: u8 = 0x40;
+pub const BPF_JNE: u8 = 0x50;
+pub const BPF_JSGT: u8 = 0x60;
+pub const BPF_JSGE: u8 = 0x70;
+pub const BPF_JLT: u8 = 0xa0;
+pub const BPF_JLE: u8 = 0xb0;
+pub const BPF_JSLT: u8 = 0xc0;
+pub const BPF_JSLE: u8 = 0xd0;
+
+pub const BPF_X: u8 = 0x08;
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Default)]
+pub struct BpfInsn {
+    pub code: u8,
+    pub dst_src_reg: u8,
+    pub off: i16,
+    pub imm: i32,
+}
+
+impl BpfInsn {
+    pub fn dst_reg(&self) -> u8 {
+        self.dst_src_reg & 0xf
+    }
+
+    pub fn src_reg(&self) -> u8 {
+        (self.dst_src_reg >> 4) & 0xf
+    }
+
+    pub fn class(&self) -> u8 {
+        self.code & 0x07
+    }
+
+    pub fn size(&self) -> u8 {
+        self.code & 0x18
+    }
+
+    pub fn mode(&self) -> u8 {
+        self.code & 0xe0
+    }
+
+    pub fn alu_op(&self) -> u8 {
+        self.code & 0xf0
+    }
+
+    pub fn is_ld_dw_imm(&self) -> bool {
+        self.code == (BPF_LD | BPF_IMM | BPF_DW)
+    }
+}

os/StarryOS/kernel/src/ebpf/ebpf_jit/jit_aarch64.rs

@@ -0,0 +1,24 @@
+use super::{HelperFn, JitBackend, JitBuffer, bpf_insn::BpfInsn};
+
+pub(crate) struct Aarch64Backend;
+
+impl JitBackend for Aarch64Backend {
+    fn emit_prologue(_buf: &mut JitBuffer) -> usize {
+        0
+    }
+    fn emit_epilogue(_buf: &mut JitBuffer) {}
+    fn emit_alu(_buf: &mut JitBuffer, _insn: &BpfInsn, _is_64: bool) {}
+    fn emit_jmp(
+        _buf: &mut JitBuffer,
+        _insn: &BpfInsn,
+        _offsets: &[usize],
+        _pc: usize,
+        _is_64: bool,
+    ) {
+    }
+    fn emit_st(_buf: &mut JitBuffer, _insn: &BpfInsn) {}
+    fn emit_stx(_buf: &mut JitBuffer, _insn: &BpfInsn) {}
+    fn emit_ldx(_buf: &mut JitBuffer, _insn: &BpfInsn) {}
+    fn emit_ld_imm64(_buf: &mut JitBuffer, _insn: &BpfInsn, _next_imm: i32) {}
+    fn emit_call(_buf: &mut JitBuffer, _helper_fn: HelperFn) {}
+}