Add 6502 TXA instruction

src/6502.c

@@ -1,6 +1,10 @@
 #include <stdio.h>
 #include "6502.h"
 
+void txa(FILE *outfile) {
+  fwrite(TXA, 1, 1, outfile);
+}
+
 void inx(FILE *outfile) {
   fwrite(INX, 1, 1, outfile);
 }
@@ -12,3 +16,4 @@ void iny(FILE *outfile) {
 void nop(FILE *outfile) {
   fwrite(NOP, 1, 1, outfile);
 }
+

src/6502.h

@@ -1,9 +1,23 @@
+#ifndef _6502_H
+#define _6502_H
+
+#define TAX "\xAA"
+#define TAY "\xA8"
+#define TSX "\xBA"
+#define TXA "\x8A"
+#define TXS "\x9A"
+#define TYA "\x98"
+
 #define INX "\xE8"
 #define INY "\xC8"
 
 #define NOP "\xEA"
 
+void txa(FILE *outfile);
+
 void inx(FILE *outfile);
 void iny(FILE *outfile);
 
 void nop(FILE *outfile);
+
+#endif

src/Makefile

@@ -13,6 +13,6 @@ all: main
 main: 
 	$(CC) $(CFLAGS) $(SRCFILES) -o $(OBJFILES)
 test: 
-	./gasm ../tests/test.asm ../tests/test.bin
+	./gasm ../tests/test.asm -o ../tests/test.bin
 	xxd ../tests/test.bin
 

src/main.c

@@ -39,9 +39,11 @@ void parser(char lexed_buf[512][128][128], FILE *outfile) { // outfile is needed
 			  inx(outfile);
 			} else if (!strcmp(lexed_buf[i][j], "INY")) {
 			  iny(outfile);
+			} else if (!strcmp(lexed_buf[i][j], "TXA")) {
+			  txa(outfile);
 			} else {
-				printf("Unrecognized command: %s\n", lexed_buf[i][j]);
-				break;
+			  printf("Unrecognized command: %s\n", lexed_buf[i][j]);
+			  break;
 			}
 		}
 	}