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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(u->src, mempeek8(u->ram.dat, u->ram.ptr++));
} break;
case UXN_OPC(0x02):
case UXN_OPC(0x22): { // nop
} break;
case UXN_OPC(0x03): { // pop
pop8(u->src);
} break;
case UXN_OPC(0x04): { // dup
Uint8 a = pop8(u->src);
push8(u->src, a);
push8(u->src, a);
} break;
case UXN_OPC(0x05): { // swp
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, a);
push8(u->src, b);
} break;
case UXN_OPC(0x06): { // ovr
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b);
push8(u->src, a);
push8(u->src, b);
} break;
case UXN_OPC(0x07): { // rot
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
Uint8 c = pop8(u->src);
push8(u->src, b);
push8(u->src, a);
push8(u->src, c);
} break;
case UXN_OPC(0x08): { // equ
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b == a);
} break;
case UXN_OPC(0x09): { // neg
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b != a);
} break;
case UXN_OPC(0x0A): { // gth
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b > a);
} break;
case UXN_OPC(0x0B): { // lth
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b < a);
} break;
case UXN_OPC(0x0C): { // jmp
Uint8 a = pop8(u->src);
u->ram.ptr += (Sint8)a;
} break;
case UXN_OPC(0x0D): { // jnz
Uint8 a = pop8(u->src);
if (pop8(u->src))
u->ram.ptr += (Sint8)a;
} break;
case UXN_OPC(0x0E): { // jsr
Uint8 a = pop8(u->src);
push16(u->dst, u->ram.ptr);
u->ram.ptr += (Sint8)a;
} break;
case UXN_OPC(0x0F): { // sth
Uint8 a = pop8(u->src);
push8(u->dst, a);
} break;
case UXN_OPC(0x10): { // pek
Uint8 a = pop8(u->src);
push8(u->src, mempeek8(u->ram.dat, a));
} break;
case UXN_OPC(0x11): { // pok
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
mempoke8(u->ram.dat, a, b);
} break;
case UXN_OPC(0x12): { // ldr
Uint8 a = pop8(u->src);
push8(u->src, mempeek8(u->ram.dat, u->ram.ptr + (Sint8)a));
} break;
case UXN_OPC(0x13): { // str
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
mempoke8(u->ram.dat, u->ram.ptr + (Sint8)a, b);
} break;
case UXN_OPC(0x14): { // lda
Uint16 a = pop16(u->src);
push8(u->src, mempeek8(u->ram.dat, a));
} break;
case UXN_OPC(0x15): { // sta
Uint16 a = pop16(u->src);
Uint8 b = pop8(u->src);
mempoke8(u->ram.dat, a, b);
} break;
case UXN_OPC(0x16): { // dei
Uint8 a = pop8(u->src);
push8(u->src, devpeek8(&u->dev[a >> 4], a));
} break;
case UXN_OPC(0x17): { // deo
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
devpoke8(&u->dev[a >> 4], a, b);
} break;
case UXN_OPC(0x18): { // add
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b + a);
} break;
case UXN_OPC(0x19): { // sub
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b - a);
} break;
case UXN_OPC(0x1A): { // mul
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b * a);
} break;
case UXN_OPC(0x1B): { // div
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b / a);
} break;
case UXN_OPC(0x1C): { // and
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b & a);
} break;
case UXN_OPC(0x1D): { // ora
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b | a);
} break;
case UXN_OPC(0x1E): { // eor
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b ^ a);
} break;
case UXN_OPC(0x1F): { // sft
Uint8 a = pop8(u->src);
Uint8 b = pop8(u->src);
push8(u->src, b >> (a & 0x07) << ((a & 0x70) >> 4));
} break;
/* 16-BIT OPCODES */
case UXN_OPC(0x21): { // lit
push16(u->src, mempeek16_i(u->ram.dat, u->ram.ptr));
u->ram.ptr += 2;
} break;
case UXN_OPC(0x23): { // pop
pop16(u->src);
} break;
case UXN_OPC(0x24): { // dup
Uint16 a = pop16(u->src);
push16(u->src, a);
push16(u->src, a);
} break;
case UXN_OPC(0x25): { // swp
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, a);
push16(u->src, b);
} break;
case UXN_OPC(0x26): { // ovr
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b);
push16(u->src, a);
push16(u->src, b);
} break;
case UXN_OPC(0x27): { // rot
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
Uint16 c = pop16(u->src);
push16(u->src, b);
push16(u->src, a);
push16(u->src, c);
} break;
case UXN_OPC(0x28): { // equ
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push8(u->src, b == a);
} break;
case UXN_OPC(0x29): { // neg
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push8(u->src, b != a);
} break;
case UXN_OPC(0x2A): { // gth
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push8(u->src, b > a);
} break;
case UXN_OPC(0x2B): { // lth
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push8(u->src, b < a);
} break;
case UXN_OPC(0x2C): { // jmp
u->ram.ptr = pop16(u->src);
} break;
case UXN_OPC(0x2D): { // jnz
Uint16 a = pop16(u->src);
if (pop8(u->src))
u->ram.ptr = a;
} break;
case UXN_OPC(0x2E): { // jsr
push16(u->dst, u->ram.ptr);
u->ram.ptr = pop16(u->src);
} break;
case UXN_OPC(0x2F): { // sth
Uint16 a = pop16(u->src);
push16(u->dst, a);
} break;
case UXN_OPC(0x30): { // pek
Uint8 a = pop8(u->src);
push16(u->src, mempeek16_i(u->ram.dat, a));
} break;
case UXN_OPC(0x31): { // pok
Uint8 a = pop8(u->src);
Uint16 b = pop16(u->src);
mempoke16_i(u->ram.dat, a, b);
} break;
case UXN_OPC(0x32): { // ldr
Uint8 a = pop8(u->src);
push16(u->src, mempeek16_i(u->ram.dat, u->ram.ptr + (Sint8)a));
} break;
case UXN_OPC(0x33): { // str
Uint8 a = pop8(u->src);
Uint16 b = pop16(u->src);
mempoke16_i(u->ram.dat, u->ram.ptr + (Sint8)a, b);
} break;
case UXN_OPC(0x34): { // lda
Uint16 a = pop16(u->src);
push16(u->src, mempeek16_i(u->ram.dat, a));
} break;
case UXN_OPC(0x35): { // sta
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
mempoke16_i(u->ram.dat, a, b);
} break;
case UXN_OPC(0x36): { // dei
Uint8 a = pop8(u->src);
push16(u->src, devpeek16(&u->dev[a >> 4], a));
} break;
case UXN_OPC(0x37): { // deo
Uint8 a = pop8(u->src);
Uint16 b = pop16(u->src);
devpoke16(&u->dev[a >> 4], a, b);
} break;
case UXN_OPC(0x38): { // add
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b + a);
} break;
case UXN_OPC(0x39): { // sub
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b - a);
} break;
case UXN_OPC(0x3A): { // mul
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b * a);
} break;
case UXN_OPC(0x3B): { // div
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b / a);
} break;
case UXN_OPC(0x3C): { // and
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b & a);
} break;
case UXN_OPC(0x3D): { // ora
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b | a);
} break;
case UXN_OPC(0x3E): { // eor
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b ^ a);
} break;
case UXN_OPC(0x3F): { // sft
Uint16 a = pop16(u->src);
Uint16 b = pop16(u->src);
push16(u->src, b >> (a & 0x000f) << ((a & 0x00f0) >> 4));
} break;
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