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2026-07-18 20:34:55 +02:00
commit 59ad004c96
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+#ifndef C64_ASM_6502_H
+#define C64_ASM_6502_H
+
+#include "types.h"
+
+// Base form for the 6502 instructions
+
+enum AsmIns
+{
+	// Implied
+	
+	ASM_BRK = 0x00,
+	
+	ASM_RTI = 0x40,
+	ASM_RTS = 0x60,
+	
+	ASM_PHP = 0x08,
+	ASM_CLC = 0x18,
+	ASM_PLP = 0x28,
+	ASM_SEC = 0x38,
+	ASM_PHA = 0x48,
+		
+	ASM_CLI = 0x58,
+	ASM_PLA = 0x68,
+	ASM_SEI = 0x78,
+	
+	ASM_DEY = 0x88,
+	ASM_TYA = 0x98,
+	ASM_TAY = 0xa8,
+	ASM_CLV = 0xb8,
+	
+	ASM_INY = 0xc8,
+	ASM_CLD = 0xd8,
+	ASM_INX = 0xe8,
+	ASM_SED = 0xf8,
+	
+	ASM_TXA = 0x8a,
+	ASM_TXS = 0x9a,
+	ASM_TAX = 0xaa,
+	ASM_TSX = 0xba,
+	ASM_DEX = 0xca,
+	ASM_NOP = 0xea,
+	
+	// Relative
+	ASM_BPL = 0x10,
+	ASM_BMI = 0x30,
+	ASM_BVC = 0x50,
+	ASM_BVS = 0x70,
+	ASM_BCC = 0x90,
+	ASM_BCS = 0xb0,
+	ASM_BNE = 0xd0,
+	ASM_BEQ = 0xf0,
+	
+	// Generic address	
+	ASM_ORA = 0x01,
+	ASM_AND = 0x21,
+	ASM_EOR = 0x41,
+	ASM_ADC = 0x61,
+	ASM_STA = 0x81,
+	ASM_LDA = 0xa1,
+	ASM_CMP = 0xc1,
+	ASM_SBC = 0xe1,
+	
+	ASM_STY = 0x80,
+	ASM_LDY = 0xa0,
+	ASM_CPY = 0xc0,
+	ASM_CPX = 0xe0,
+	
+	ASM_ASL = 0x02,
+	ASM_ROL = 0x22,
+	ASM_LSR = 0x42,
+	ASM_ROR = 0x62,
+	
+	ASM_STX = 0x82,	
+	ASM_LDX = 0xa2,
+	ASM_DEC = 0xc2,
+	ASM_INC = 0xe2,
+	
+	// Limited Generic
+	ASM_BIT = 0x20,
+	
+	// Jump
+	ASM_JMP = 0x40,
+	ASM_JSR = 0x2c
+};
+
+// the asm_ instructions emit a machine instruction at the given
+// location and return the size.
+
+// implied
+inline byte asm_np(byte * ip, AsmIns ins);
+
+// accu (e.g. rol/ror)
+inline byte asm_ac(byte * ip, AsmIns ins);
+
+// zero page
+inline byte asm_zp(byte * ip, AsmIns ins, byte addr);
+
+// relative branch
+inline byte asm_rl(byte * ip, AsmIns ins, sbyte addr);
+
+// immediate
+inline byte asm_im(byte * ip, AsmIns ins, byte value);
+
+// zero page indexed by x
+inline byte asm_zx(byte * ip, AsmIns ins, byte addr);
+
+// zero page indexed by y
+inline byte asm_zy(byte * ip, AsmIns ins, byte addr);
+
+// absolute
+inline byte asm_ab(byte * ip, AsmIns ins, unsigned addr);
+
+// indirect (jmp)
+inline byte asm_in(byte * ip, AsmIns ins, unsigned addr);
+
+// absolute indexed by x
+inline byte asm_ax(byte * ip, AsmIns ins, unsigned addr);
+
+// absolute indexed by y
+inline byte asm_ay(byte * ip, AsmIns ins, unsigned addr);
+
+// zero page indirect indexed by x
+inline byte asm_ix(byte * ip, AsmIns ins, byte addr);
+
+// zero page indirect indexed by y
+inline byte asm_iy(byte * ip, AsmIns ins, byte addr);
+
+#pragma compile("asm6502.c")
+
+#endif
+