This commit was generated by cvs2svn to compensate for changes in r2,

which included commits to RCS files with non-trunk default branches.


git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81

include/6502.h

@@ -0,0 +1,88 @@
+/*
+ * 6502.h
+ *
+ * Ullrich von Bassewitz, 20.09.1998
+ */
+
+
+
+#ifndef _6502_H
+#define _6502_H
+
+
+
+/* Possible returns of getcpu() */
+#define CPU_6502	0
+#define CPU_65C02	1
+#define CPU_65816	2
+
+unsigned char getcpu (void);
+/* Detect the CPU the program is running on */
+
+
+
+/* Macros for CPU instructions */
+#define	BRK()	__asm__ ("\tbrk")
+#define CLI()	__asm__ ("\tcli")
+#define SEI()	__asm__ ("\tsei")
+#define JAM()	__asm__ ("\t.byte\t$02")
+
+
+
+/* Struct that holds the registers for the sys function */
+struct regs {
+    unsigned char a;		/* A register value */
+    unsigned char x;		/* X register value */
+    unsigned char y;		/* Y register value */
+    unsigned char flags;	/* Flags value */
+    unsigned      pc;		/* Program counter */
+};
+
+/* Defines for the flags in the regs structure */
+#define F_NEG		0x80	/* N flag */
+#define F_OVF		0x40	/* V flag */
+#define F_BRK		0x10	/* B flag */
+#define F_DEC		0x08	/* D flag */
+#define F_IEN  	   	0x04	/* I flag */
+#define F_ZERO	   	0x02	/* Z flag */
+#define F_CARRY	   	0x01	/* C flag */
+
+/* Function to call any machine language subroutine. All registers in the
+ * regs structure are passed into the routine and the results are passed
+ * out. Some of the flags are ignored on input. The called routine must
+ * end with an RTS.
+ */
+void __fastcall__ _sys (struct regs* r);
+
+
+
+/* Set and reset the break vector. The given user function is called if
+ * a break occurs. The values of the registers may be read from the brk_...
+ * variables. The value in brk_pc will point to the address that contains
+ * the brk instruction.
+ * The set_brk function will install an exit handler that will reset the
+ * vector if the program ends.
+ */
+
+extern unsigned char brk_a;	/* A register value */
+extern unsigned char brk_x;	/* X register value */
+extern unsigned char brk_y;	/* Y register value */
+extern unsigned char brk_sr;	/* Status register */
+extern unsigned brk_pc;		/* PC value */
+
+typedef void (*brk_handler) (void);
+/* Type of the break handler */
+
+void __fastcall__ set_brk (brk_handler f);
+/* Set the break vector to the given address, return the old address */
+
+void reset_brk (void);
+/* Reset the break vector to the original value */
+
+
+
+/* End of 6502.h */
+#endif
+
+
+