95 lines
1.5 KiB
C
95 lines
1.5 KiB
C
#include "asm6502.h"
|
|
|
|
inline byte asm_np(byte * ip, AsmIns ins)
|
|
{
|
|
ip[0] = ins & 0xff;
|
|
return 1;
|
|
}
|
|
|
|
inline byte asm_ac(byte * ip, AsmIns ins)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x08;
|
|
return 1;
|
|
}
|
|
|
|
inline byte asm_zp(byte * ip, AsmIns ins, byte addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x04;
|
|
ip[1] = addr;
|
|
return 2;
|
|
}
|
|
|
|
inline byte asm_rl(byte * ip, AsmIns ins, sbyte addr)
|
|
{
|
|
ip[0] = ins & 0xff;
|
|
ip[1] = (byte)addr;
|
|
return 2;
|
|
}
|
|
|
|
inline byte asm_im(byte * ip, AsmIns ins, byte value)
|
|
{
|
|
ip[0] = (ins & 0xff) | ((ins & 0x01) << 3);
|
|
ip[1] = value;
|
|
return 2;
|
|
}
|
|
|
|
inline byte asm_zx(byte * ip, AsmIns ins, byte addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x05;
|
|
ip[1] = addr;
|
|
return 2;
|
|
}
|
|
|
|
inline byte asm_zy(byte * ip, AsmIns ins, byte addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x05;
|
|
ip[1] = addr;
|
|
return 2;
|
|
}
|
|
|
|
inline byte asm_ab(byte * ip, AsmIns ins, unsigned addr)
|
|
{
|
|
ip[0] = (ins & 0xff) ^ 0x0c;
|
|
ip[1] = addr & 0xff;
|
|
ip[2] = addr >> 8;
|
|
return 3;
|
|
}
|
|
|
|
inline byte asm_in(byte * ip, AsmIns ins, unsigned addr)
|
|
{
|
|
ip[0] = (ins & 0xff) ^ 0x2c;
|
|
ip[1] = addr & 0xff;
|
|
ip[2] = addr >> 8;
|
|
return 3;
|
|
}
|
|
|
|
inline byte asm_ax(byte * ip, AsmIns ins, unsigned addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x1c;
|
|
ip[1] = addr & 0xff;
|
|
ip[2] = addr >> 8;
|
|
return 3;
|
|
}
|
|
|
|
inline byte asm_ay(byte * ip, AsmIns ins, unsigned addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x18;
|
|
ip[1] = addr & 0xff;
|
|
ip[2] = addr >> 8;
|
|
return 3;
|
|
}
|
|
|
|
inline byte asm_ix(byte * ip, AsmIns ins, byte addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x00;
|
|
ip[1] = addr;
|
|
return 2;
|
|
}
|
|
|
|
inline byte asm_iy(byte * ip, AsmIns ins, byte addr)
|
|
{
|
|
ip[0] = (ins & 0xff) | 0x10;
|
|
ip[1] = addr;
|
|
return 2;
|
|
}
|