From c1d5bf8ab7648418fa7120ea4868205f3cf7e857 Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Mon, 8 May 2023 09:49:43 +1000
Subject: instructions done, plus minor changes

---
 src/cpu/addressing.h               |  2 ++
 src/cpu/instructions/definitions.h | 36 +++++++++++++++++++++++++++---------
 src/interpreter.c                  |  2 +-
 3 files changed, 30 insertions(+), 10 deletions(-)

(limited to 'src')

diff --git a/src/cpu/addressing.h b/src/cpu/addressing.h
index 0969025..29fa87c 100644
--- a/src/cpu/addressing.h
+++ b/src/cpu/addressing.h
@@ -33,6 +33,8 @@ typedef struct AddData{
 //Holds address of current instruction.
 void* current_instruction;
 
+#define getInstructionLength(c) fAddressGetLength(*getInstructionTableAddressing(c))
+
 int fAddressGetLength(Addressing addr){
 	switch(addr){
 		case eAbsolute: case eAbsoluteIndexedX: case eAbsoluteIndexedY:
diff --git a/src/cpu/instructions/definitions.h b/src/cpu/instructions/definitions.h
index 937ca10..98345c5 100644
--- a/src/cpu/instructions/definitions.h
+++ b/src/cpu/instructions/definitions.h
@@ -2,7 +2,8 @@
 //	Definition of all instruction functions, handling effect of instruction and flags.
 
 AddData idata;
-
+#define GET_STACK		getMemory(0x01FF - S)
+#define SET_STACK(z)	setMemory(0x01FF - S, z)
 
 /*	TO DO
 
@@ -280,40 +281,50 @@ void fTXS(Addressing addr, address val){ idata = fAddress(addr, val);
 }
 
 void fPHA(Addressing addr, address val){ idata = fAddress(addr, val);
-	setMemory(0x01FF-S, acc);
+	SET_STACK(acc);
 	S++;
 }
 
 void fPHP(Addressing addr, address val){ idata = fAddress(addr, val);
-	setMemory(0x01FF-S, P);
+	SET_STACK(P);
 	S++;
 }
 
 void fPLA(Addressing addr, address val){ idata = fAddress(addr, val);
 	S--;
-	acc = getMemory(0x01FF-S);
+	acc = GET_STACK;
 }
 
 void fPLP(Addressing addr, address val){ idata = fAddress(addr, val);
 	S--;
-	P = getMemory(0x01FF-S);
+	P = GET_STACK;
 }
 
 // Subroutine Instructions
 // NEED TO FINISH THESE
 
 void fJSR(Addressing addr, address val){ idata = fAddress(addr, val);
-	Memory[0x01FF-S] = (idata.add-1);
+	SET_STACK(((PC-1) & 0xFF00) >> 8);
+	S++;
+	SET_STACK((PC-1) & 0x00FF);
 	S++;
 	PC = idata.add;
 }
 
 void fRTS(Addressing addr, address val){ idata = fAddress(addr, val);
-
+	S--;
+	PC = (address)(GET_STACK + 1);
+	S--;
+	PC += ((address)(GET_STACK)) << 8;
 }
 
 void fRTI(Addressing addr, address val){ idata = fAddress(addr, val);
-
+	S--;
+	P = GET_STACK; //NEED TO FIX
+	S--;
+	PC = (address)(GET_STACK);
+	S--;
+	PC += (address)(GET_STACK << 8);
 }
 
 // Set/Reset Insutrctions
@@ -352,7 +363,14 @@ void fNOP(Addressing addr, address val){ idata = fAddress(addr, val);
 }
 
 void fBRK(Addressing addr, address val){ idata = fAddress(addr, val);
-	flagSet(flag_B);
+	SET_STACK((((PC+2) & 0xFF00) >> 8));
+	S++;
+	SET_STACK((PC+2) & 0x00FF);
+	S++;
+	SET_STACK(P);
+	S++;
+	PC = (address)(getMemory(0xFFFE));
+	PC += ((address)(getMemory(0xFFFF)) << 8);
 }
 
 #ifdef ILLEGAL
diff --git a/src/interpreter.c b/src/interpreter.c
index 96c4617..a51ade1 100644
--- a/src/interpreter.c
+++ b/src/interpreter.c
@@ -106,7 +106,7 @@ int main(int argc, char *argv[]){
         c += dCharToNum(getc(stdin));
         address x = 0x0000;
         char z = 0x00;
-        for(int i = ((fAddressGetLength(*getInstructionTableAddressing(c)) * 2) - 2); i > 0; i--) {
+        for(int i = ((getInstructionLength(c) * 2) - 2); i > 0; i--) {
             do {
                 z = getc(stdin);
             } while (z == ' ' || z == '\t');
-- 
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