From b823c274658802b43e6f7ef2c4448a70dec45cc8 Mon Sep 17 00:00:00 2001
From: Duncan Smith
Date: Fri, 18 Jun 2010 09:04:24 -0700
Subject: Made memory-access macros work properly

---
 main.asm | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

(limited to 'main.asm')

diff --git a/main.asm b/main.asm
index 28a0c8e..b9aae08 100644
--- a/main.asm
+++ b/main.asm
@@ -46,36 +46,42 @@
 
 	;; Macro to read a byte from main memory at register \1.  Puts
 	;; the byte read in \2.
-FETCHB	MACRO			; 14 cycles, 4 bytes
-	;; XXX deref
-	move.b	0(a6,\1.w),\2
+FETCHB	MACRO			; XX cycles, X bytes
+	move.w	\1,d1
+	bsr	deref
+	move.b	(a0),\2
 	ENDM
 
-	;; Macro to write a byte in \1 to main memory at \2 (regs only)
+	;; Macro to write a byte in \1 to main memory at \2
 PUTB	MACRO			; 14 cycles, 4 bytes
-	;; XXX deref
-	move.b	\1,0(a6,\2)
+	move.w	\2,d1
+	bsr	deref
+	move.b	\1,(a0)
 	ENDM
 
 	;; Macro to read a word from main memory at register \1
 	;; (unaligned).  Puts the word read in \2.
 	;;
-	;; XXX deref
-	;;
 	;; <debrouxl> It decrements sp by 2, but stores the result at
 	;; sp, not at 1(sp). So you essentially get a "free" shift
 	;; left by 8 bits. Much faster than lsl.w / rol.w #8, at
 	;; least.
-FETCHW	MACRO
-	move.b	1(a6,\1.w),-(sp); 18/4
+FETCHW	MACRO			;  ?/16
+	move.w	\1,d1		;  4/2
+	bsr	deref		;  ?/4
+	move.b	(a0),-(sp)	; 18/4
 	move.w	(sp)+,\2	;  8/2
-	move.b	0(a6,\1.w),\2	; 14/4
+	move.b	(a0),\2		; 14/4
 	ENDM
 
 	;; Macro to write a word in \1 to main memory at \2 (regs only)
-PUTW	MACRO			; 14 cycles, 4 bytes
-	;; XXX ALIGNMENT
-	move.b	\1,0(a6,\2)
+PUTW	MACRO			; 
+	move.w	\2,d1
+	bsr	deref
+	move.w	\1,d0
+	move.b	d0,(a0)+
+	LOHI	d0
+	move.b	d0,(a0)
 	ENDM
 
 	;; Push the word in \1 (register) using stack register a4.
@@ -2088,6 +2094,8 @@ emu_op_e1:
 emu_op_e2:
 	;; EX	(SP),HL
 	;; Exchange
+	
+
 	START
 emu_op_e3:
 	START
-- 
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