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/*
Copyright (u) 2021 Devine Lu Linvega
Copyright (c) 2021 Adrian "asie" Siekierka
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/
/* 8-BIT OPCODES */
case UXN_OPC(0x00):
case UXN_OPC(0x20): { // brk
u->ram.ptr = 0;
} break;
case UXN_OPC(0x01): { // lit
push8(UXN_SRC, mempeek8(u->ram.dat, u->ram.ptr++));
} break;
case UXN_OPC(0x02):
case UXN_OPC(0x22): { // nop
} break;
case UXN_OPC(0x03): { // pop
UXN_KEEP_SYNC;
pop8(UXN_SRC);
} break;
case UXN_OPC(0x04): { // dup
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push8(UXN_SRC, a);
push8(UXN_SRC, a);
} break;
case UXN_OPC(0x05): { // swp
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, a);
push8(UXN_SRC, b);
} break;
case UXN_OPC(0x06): { // ovr
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b);
push8(UXN_SRC, a);
push8(UXN_SRC, b);
} break;
case UXN_OPC(0x07): { // rot
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
Uint8 c = pop8(UXN_SRC);
push8(UXN_SRC, b);
push8(UXN_SRC, a);
push8(UXN_SRC, c);
} break;
case UXN_OPC(0x08): { // equ
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b == a);
} break;
case UXN_OPC(0x09): { // neg
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b != a);
} break;
case UXN_OPC(0x0A): { // gth
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b > a);
} break;
case UXN_OPC(0x0B): { // lth
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b < a);
} break;
case UXN_OPC(0x0C): { // jmp
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
u->ram.ptr += (Sint8)a;
} break;
case UXN_OPC(0x0D): { // jnz
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
if (pop8(UXN_SRC))
u->ram.ptr += (Sint8)a;
} break;
case UXN_OPC(0x0E): { // jsr
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push16(UXN_DST, u->ram.ptr);
u->ram.ptr += (Sint8)a;
} break;
case UXN_OPC(0x0F): { // sth
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push8(UXN_DST, a);
} break;
case UXN_OPC(0x10): { // pek
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push8(UXN_SRC, mempeek8(u->ram.dat, a));
} break;
case UXN_OPC(0x11): { // pok
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
mempoke8(u->ram.dat, a, b);
} break;
case UXN_OPC(0x12): { // ldr
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push8(UXN_SRC, mempeek8(u->ram.dat, u->ram.ptr + (Sint8)a));
} break;
case UXN_OPC(0x13): { // str
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
mempoke8(u->ram.dat, u->ram.ptr + (Sint8)a, b);
} break;
case UXN_OPC(0x14): { // lda
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
push8(UXN_SRC, mempeek8(u->ram.dat, a));
} break;
case UXN_OPC(0x15): { // sta
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
mempoke8(u->ram.dat, a, b);
} break;
case UXN_OPC(0x16): { // dei
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push8(UXN_SRC, devpeek8(&u->dev[a >> 4], a));
} break;
case UXN_OPC(0x17): { // deo
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
devpoke8(&u->dev[a >> 4], a, b);
} break;
case UXN_OPC(0x18): { // add
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b + a);
} break;
case UXN_OPC(0x19): { // sub
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b - a);
} break;
case UXN_OPC(0x1A): { // mul
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b * a);
} break;
case UXN_OPC(0x1B): { // div
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b / a);
} break;
case UXN_OPC(0x1C): { // and
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b & a);
} break;
case UXN_OPC(0x1D): { // ora
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b | a);
} break;
case UXN_OPC(0x1E): { // eor
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b ^ a);
} break;
case UXN_OPC(0x1F): { // sft
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint8 b = pop8(UXN_SRC);
push8(UXN_SRC, b >> (a & 0x07) << ((a & 0x70) >> 4));
} break;
/* 16-BIT OPCODES */
case UXN_OPC(0x21): { // lit
push16(UXN_SRC, mempeek16(u->ram.dat, u->ram.ptr));
u->ram.ptr += 2;
} break;
case UXN_OPC(0x23): { // pop
UXN_KEEP_SYNC;
pop16(UXN_SRC);
} break;
case UXN_OPC(0x24): { // dup
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
push16(UXN_SRC, a);
push16(UXN_SRC, a);
} break;
case UXN_OPC(0x25): { // swp
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, a);
push16(UXN_SRC, b);
} break;
case UXN_OPC(0x26): { // ovr
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b);
push16(UXN_SRC, a);
push16(UXN_SRC, b);
} break;
case UXN_OPC(0x27): { // rot
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
Uint16 c = pop16(UXN_SRC);
push16(UXN_SRC, b);
push16(UXN_SRC, a);
push16(UXN_SRC, c);
} break;
case UXN_OPC(0x28): { // equ
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push8(UXN_SRC, b == a);
} break;
case UXN_OPC(0x29): { // neg
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push8(UXN_SRC, b != a);
} break;
case UXN_OPC(0x2A): { // gth
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push8(UXN_SRC, b > a);
} break;
case UXN_OPC(0x2B): { // lth
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push8(UXN_SRC, b < a);
} break;
case UXN_OPC(0x2C): { // jmp
UXN_KEEP_SYNC;
u->ram.ptr = pop16(UXN_SRC);
} break;
case UXN_OPC(0x2D): { // jnz
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
if (pop8(UXN_SRC))
u->ram.ptr = a;
} break;
case UXN_OPC(0x2E): { // jsr
UXN_KEEP_SYNC;
push16(UXN_DST, u->ram.ptr);
u->ram.ptr = pop16(UXN_SRC);
} break;
case UXN_OPC(0x2F): { // sth
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
push16(UXN_DST, a);
} break;
case UXN_OPC(0x30): { // pek
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push16(UXN_SRC, mempeek16(u->ram.dat, a));
} break;
case UXN_OPC(0x31): { // pok
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
mempoke16(u->ram.dat, a, b);
} break;
case UXN_OPC(0x32): { // ldr
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push16(UXN_SRC, mempeek16(u->ram.dat, u->ram.ptr + (Sint8)a));
} break;
case UXN_OPC(0x33): { // str
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
mempoke16(u->ram.dat, u->ram.ptr + (Sint8)a, b);
} break;
case UXN_OPC(0x34): { // lda
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
push16(UXN_SRC, mempeek16(u->ram.dat, a));
} break;
case UXN_OPC(0x35): { // sta
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
mempoke16(u->ram.dat, a, b);
} break;
case UXN_OPC(0x36): { // dei
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
push16(UXN_SRC, devpeek16(&u->dev[a >> 4], a));
} break;
case UXN_OPC(0x37): { // deo
UXN_KEEP_SYNC;
Uint8 a = pop8(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
devpoke16(&u->dev[a >> 4], a, b);
} break;
case UXN_OPC(0x38): { // add
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b + a);
} break;
case UXN_OPC(0x39): { // sub
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b - a);
} break;
case UXN_OPC(0x3A): { // mul
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b * a);
} break;
case UXN_OPC(0x3B): { // div
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b / a);
} break;
case UXN_OPC(0x3C): { // and
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b & a);
} break;
case UXN_OPC(0x3D): { // ora
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b | a);
} break;
case UXN_OPC(0x3E): { // eor
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b ^ a);
} break;
case UXN_OPC(0x3F): { // sft
UXN_KEEP_SYNC;
Uint16 a = pop16(UXN_SRC);
Uint16 b = pop16(UXN_SRC);
push16(UXN_SRC, b >> (a & 0x000f) << ((a & 0x00f0) >> 4));
} break;
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