1 files changed, 75 insertions, 0 deletions
diff --git a/src/backend/x86.c b/src/backend/x86.c
new file mode 100644
index 0000000..05aafc1
--- /dev/null
+++ b/src/backend/x86.c
@@ -0,0 +1,75 @@
+#include <x86.h>
+
+#include <backend.h>
+
+#define REG_SAFETY(reg)								                \
+	do {									                        \
+		if(reg > 15) DIE("Compiler error! Register %d is invalid!"	\
+				 , reg);					                        \
+	} while(0)
+
+// TODO: Consider implementing a modrm backend that is rex-aware.
+
+//void x86_calc_modrm(uint16_t reg, uint16_t mod)
+
+void x86_mov_r_i64(uint8_t reg, uint64_t value)
+{
+	REG_SAFETY(reg);
+	emit8(REXW);
+	emit8(0xB8 + reg);
+	emit64(value);
+}
+
+void x86_mov_rm_i64(uint8_t mode, uint16_t reg)
+{
+	DIE("TODO");
+}
+
+void x86_push_i32(uint32_t value)
+{
+	emit8(0x68);
+	emit32(value);
+}
+
+/*
+ * @todo
+ */
+void x86_push_i16(uint16_t value)
+{
+	DIE("NOT IMPLEMENTED");
+	// 66h
+	// PUSH 68
+	// IMM value
+}
+
+void x86_push_i8(uint8_t value)
+{
+	emit8(0x6A);
+	emit8(value);
+}
+
+void x86_push_r64(uint8_t reg)
+{
+	REG_SAFETY(reg);
+	emit8(0x50 + reg);
+}
+
+void x86_push_rm64(uint8_t mode, uint8_t r, uint64_t m)
+{
+	REG_SAFETY(r);
+
+	if(r > 7) {
+		emit8(REXWR);
+	} else if (r < 7) {
+		emit8(REXW);
+	}
+
+	emit8(0xFF);
+
+	// Calculate MODRM
+
+	// emit MODRM byte
+	// if mode = 1:
+	//    disp
+	// done
+}