WINDOWS HELLO WORLD (scuffed)

src/arch/x86_64/encode.rs

@@ -110,6 +110,18 @@ impl Encoder<'_> {
         Ok(())
     }
 
+    pub fn mem_mov(&mut self, reg: RegMode, offset: u64, val: u64) {
+        assert!(offset <= u8::MAX as u64);
+        assert!(val <= u32::MAX as u64);
+        self.data
+            .extend([0x48 | ((reg.gt8() as u8) << 2), 0xc7, 0x40 | reg.base()]);
+        if reg.reg == rsp.reg {
+            self.data.push(0x24)
+        }
+        self.data.push(offset as u8);
+        self.data.extend((val as u32).to_le_bytes());
+    }
+
     pub fn lea(&mut self, dst: RegMode, sym: Symbol) {
         self.data.extend([
             0x48 | ((dst.gt8() as u8) << 2),
@@ -184,6 +196,7 @@ impl Encoder<'_> {
     pub fn asm(&mut self, instr: Instr) -> Result<(), CompilerMsg> {
         match instr {
             Instr::Mov { dst, src } => self.mov(dst, src)?,
+            Instr::MemMov { reg, offset, val } => self.mem_mov(reg, offset, val),
             Instr::Int(code) => self.int(code),
             Instr::Syscall => self.syscall(),
             Instr::Lea { dst, sym } => self.lea(dst, sym),