From 90925e7e06cab05db39b5ad277135bd14050043b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ciro=20Santilli=20=E5=85=AD=E5=9B=9B=E4=BA=8B=E4=BB=B6=20?=
 =?UTF-8?q?=E6=B3=95=E8=BD=AE=E5=8A=9F?= <ciro.santilli@gmail.com>
Date: Mon, 10 Jun 2019 00:00:00 +0000
Subject: [PATCH] x86 asm: make add awesome

---
 userland/arch/x86_64/add.S | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/userland/arch/x86_64/add.S b/userland/arch/x86_64/add.S
index 2c309e7..31193b9 100644
--- a/userland/arch/x86_64/add.S
+++ b/userland/arch/x86_64/add.S
@@ -3,7 +3,43 @@
 #include <lkmc.h>
 
 LKMC_PROLOGUE
+    /* Register immediate. */
     mov $1, %rax
     add $2, %rax
     LKMC_ASSERT_EQ(%rax, $3)
+
+    /* Register register. */
+    mov $1, %rax
+    mov $2, %rbx
+    add %rbx, %rax
+    LKMC_ASSERT_EQ(%rax, $3)
+
+    /* Memory and immediate. */
+.data
+    memory_immediate: .quad 0x123456789ABCDEF0
+.text
+    addq $1, memory_immediate
+    LKMC_ASSERT_EQ(memory_immediate, $0x123456789ABCDEF1)
+
+    /* Memory and register. */
+.data
+    memory_register: .quad 0x123456789ABCDEF0
+.text
+    mov $1, %rax
+    add %rax, memory_register
+    LKMC_ASSERT_EQ(memory_register, $0x123456789ABCDEF1)
+
+#if 0
+    /* Cannot do different register sizes:
+     * Error: operand type mismatch for for `add'
+     */
+    add %rax, %eax
+#endif
+
+#if 0
+    /* Cannot do memory memory.
+     * Error: too many memory references for `add'
+     */
+    addq memory_immediate, memory_register
+#endif
 LKMC_EPILOGUE