6502 assembly tables

asm6502.cpp

#include <stdint.h>

// operand format
enum {
    OPR_IMM = 0,
    OPR_ZP,
    OPR_ZPX,
    OPR_ZPY,
    OPR_ABS, 
    OPR_ABSX,
    OPR_ABSY,
    OPR_IND, 
    OPR_INDX,
    OPR_INDY,
    OPR_SNGL,
    OPR_BRA
}

struct asm_entry_t {
    char mnemonic[4];
    uint8_t opcodes[12];
};

static const asm_entry_t asm_table[] = {
#define ____ 0xff
/*        2     2     2     2     3     3     3     3     2     2     1     2   */
/* NAME,  IMM,  ZP,   ZPX,  ZPY,  ABS,  ABSX, ABSY, IND,  INDX, INDY, SNGL, BRA */
  {"ADC", 0x69, 0x65, 0x75, ____, 0x6d, 0x7d, 0x79, ____, 0x61, 0x71, ____, ____},
  {"AND", 0x29, 0x25, 0x35, ____, 0x2d, 0x3d, 0x39, ____, 0x21, 0x31, ____, ____},
  {"ASL", ____, 0x06, 0x16, ____, 0x0e, 0x1e, ____, ____, ____, ____, 0x0a, ____},
  {"BCC", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x90},
  {"BCS", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xb0},
  {"BEQ", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xf0},
  {"BIT", ____, 0x24, ____, ____, 0x2c, ____, ____, ____, ____, ____, ____, ____},
  {"BMI", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x30},
  {"BNE", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xd0},
  {"BPL", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x10},
  {"BRK", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x00, ____},
  {"BVC", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x50},
  {"BVS", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x70},
  {"CLC", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x18, ____},
  {"CLD", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xd8, ____},
  {"CLI", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x58, ____},
  {"CLV", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xb8, ____},
  {"CMP", 0xc9, 0xc5, 0xd5, ____, 0xcd, 0xdd, 0xd9, ____, 0xc1, 0xd1, ____, ____},
  {"CPX", 0xe0, 0xe4, ____, ____, 0xec, ____, ____, ____, ____, ____, ____, ____},
  {"CPY", 0xc0, 0xc4, ____, ____, 0xcc, ____, ____, ____, ____, ____, ____, ____},
  {"DEC", ____, 0xc6, 0xd6, ____, 0xce, 0xde, ____, ____, ____, ____, ____, ____},
  {"DEX", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xca, ____},
  {"DEY", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x88, ____},
  {"EOR", 0x49, 0x45, 0x55, ____, 0x4d, 0x5d, 0x59, ____, 0x41, 0x51, ____, ____},
  {"INC", ____, 0xe6, 0xf6, ____, 0xee, 0xfe, ____, ____, ____, ____, ____, ____},
  {"INX", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xe8, ____},
  {"INY", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xc8, ____},
  {"JMP", ____, ____, ____, ____, 0x4c, ____, ____, 0x6c, ____, ____, ____, ____},
  {"JSR", ____, ____, ____, ____, 0x20, ____, ____, ____, ____, ____, ____, ____},
  {"LDA", 0xa9, 0xa5, 0xb5, ____, 0xad, 0xbd, 0xb9, ____, 0xa1, 0xb1, ____, ____},
  {"LDX", 0xa2, 0xa6, ____, 0xb6, 0xae, ____, 0xbe, ____, ____, ____, ____, ____},
  {"LDY", 0xa0, 0xa4, 0xb4, ____, 0xac, 0xbc, ____, ____, ____, ____, ____, ____},
  {"LSR", ____, 0x46, 0x56, ____, 0x4e, 0x5e, ____, ____, ____, ____, 0x4a, ____},
  {"NOP", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xea, ____},
  {"ORA", 0x09, 0x05, 0x15, ____, 0x0d, 0x1d, 0x19, ____, 0x01, 0x11, ____, ____},
  {"PHA", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x48, ____},
  {"PHP", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x08, ____},
  {"PLA", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x68, ____},
  {"PLP", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x28, ____},
  {"ROL", ____, 0x26, 0x36, ____, 0x2e, 0x3e, ____, ____, ____, ____, 0x2a, ____},
  {"ROR", ____, 0x66, 0x76, ____, 0x6e, 0x7e, ____, ____, ____, ____, 0x6a, ____},
  {"RTI", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x40, ____},
  {"RTS", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x60, ____},
  {"SBC", 0xe9, 0xe5, 0xf5, ____, 0xed, 0xfd, 0xf9, ____, 0xe1, 0xf1, ____, ____},
  {"SEC", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x38, ____},
  {"SED", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xf8, ____},
  {"SEI", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x78, ____},
  {"STA", ____, 0x85, 0x95, ____, 0x8d, 0x9d, 0x99, ____, 0x81, 0x91, ____, ____},
  {"STX", ____, 0x86, ____, 0x96, 0x8e, ____, ____, ____, ____, ____, ____, ____},
  {"STY", ____, 0x84, 0x94, ____, 0x8c, ____, ____, ____, ____, ____, ____, ____},
  {"TAX", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xaa, ____},
  {"TAY", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xa8, ____},
  {"TSX", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0xba, ____},
  {"TXA", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x8a, ____},
  {"TXS", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x9a, ____},
  {"TYA", ____, ____, ____, ____, ____, ____, ____, ____, ____, ____, 0x98, ____},
  {"WDM", 0x42, 0x42, ____, ____, ____, ____, ____, ____, ____, ____, ____, ____},
#undef ____
};

const uint8_t asm_index[] = {
#define __ 0xff
//  a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s  
    0,  3, 13, 20, 23, __, __, __, 24, 27, __, 29, __, 33, 34, 35, __, 39, 43,
//  t   u   v   w   x   y   z
   50, __, __, 56, __, __, __
#undef __
};