211 lines
9.3 KiB
C
211 lines
9.3 KiB
C
#include <stdio.h>
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/*
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Copyright (u) 2021 Devine Lu Linvega
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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#include "uxn.h"
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#pragma mark - Operations
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/* clang-format off */
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void setflag(Uint8 *a, char flag, int b) { if(b) *a |= flag; else *a &= (~flag); }
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int getflag(Uint8 *a, char flag) { return *a & flag; }
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Uint8 devpoke8(Uxn *u, Uint8 id, Uint8 b0, Uint8 b1){ return id < u->devices ? u->dev[id].poke(u, PAGE_DEVICE + id * 0x10, b0, b1) : b1; }
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void push8(Stack *s, Uint8 a) { if (s->ptr == 0xff) { s->error = 2; return; } s->dat[s->ptr++] = a; }
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Uint8 pop8(Stack *s) { if (s->ptr == 0) { s->error = 1; return 0; } return s->dat[--s->ptr]; }
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Uint8 peek8(Stack *s, Uint8 a) { if (s->ptr < a + 1) s->error = 1; return s->dat[s->ptr - a - 1]; }
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void mempoke8(Uxn *u, Uint16 a, Uint8 b) { u->ram.dat[a] = (a & 0xff00) == PAGE_DEVICE ? devpoke8(u, (a & 0xff) >> 4, a & 0xf, b) : b; }
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Uint8 mempeek8(Uxn *u, Uint16 a) { return u->ram.dat[a]; }
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void push16(Stack *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }
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Uint16 pop16(Stack *s) { return pop8(s) + (pop8(s) << 8); }
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Uint16 peek16(Stack *s, Uint8 a) { return peek8(s, a * 2) + (peek8(s, a * 2 + 1) << 8); }
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void mempoke16(Uxn *u, Uint16 a, Uint16 b) { mempoke8(u, a, b >> 8); mempoke8(u, a + 1, b); }
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Uint16 mempeek16(Uxn *u, Uint16 a) { return (mempeek8(u, a) << 8) + mempeek8(u, a + 1); }
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/* Stack */
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void op_brk(Uxn *u) { setflag(&u->status, FLAG_HALT, 1); }
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void op_nop(Uxn *u) { (void)u; }
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void op_lit(Uxn *u) { u->literal += 1; }
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void op_pop(Uxn *u) { pop8(u->src); }
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void op_dup(Uxn *u) { push8(u->src, peek8(u->src, 0)); }
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void op_swp(Uxn *u) { Uint8 b = pop8(u->src), a = pop8(u->src); push8(u->src, b); push8(u->src, a); }
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void op_ovr(Uxn *u) { push8(u->src, peek8(u->src, 1)); }
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void op_rot(Uxn *u) { Uint8 c = pop8(u->src), b = pop8(u->src), a = pop8(u->src); push8(u->src, b); push8(u->src, c); push8(u->src, a); }
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/* Logic */
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void op_equ(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b == a); }
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void op_neq(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b != a); }
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void op_gth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b > a); }
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void op_lth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b < a); }
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void op_gts(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, (Sint8)b > (Sint8)a); }
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void op_lts(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, (Sint8)b < (Sint8)a); }
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/* Memory */
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void op_pek(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u, a)); }
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void op_pok(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u, a, b); }
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void op_ldr(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u, a)); }
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void op_str(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u, a, b); }
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void op_jmp(Uxn *u) { Uint8 a = pop8(u->src); u->ram.ptr += (Sint8)a; }
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void op_jnz(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); if (b) u->ram.ptr += (Sint8)a; }
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void op_jsr(Uxn *u) { Uint8 a = pop8(u->src); push16(u->dst, u->ram.ptr); u->ram.ptr += (Sint8)a; }
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void op_sth(Uxn *u) { Uint8 a = pop8(u->src); push8(u->dst, a); }
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/* Arithmetic */
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void op_add(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b + a); }
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void op_sub(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b - a); }
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void op_mul(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b * a); }
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void op_div(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b / a); }
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void op_and(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b & a); }
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void op_ora(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b | a); }
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void op_eor(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b ^ a); }
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void op_sft(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b >> ((a & 0x0f) % 8) << (((a & 0xf0) >> 4) % 8)); }
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/* Stack */
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void op_lit16(Uxn *u) { u->literal += 2; }
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void op_nop16(Uxn *u) { printf("%04x\n", pop16(u->src)); }
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void op_pop16(Uxn *u) { pop16(u->src); }
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void op_dup16(Uxn *u) { push16(u->src, peek16(u->src, 0)); }
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void op_swp16(Uxn *u) { Uint16 b = pop16(u->src), a = pop16(u->src); push16(u->src, b); push16(u->src, a); }
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void op_ovr16(Uxn *u) { push16(u->src, peek16(u->src, 1)); }
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void op_rot16(Uxn *u) { Uint16 c = pop16(u->src), b = pop16(u->src), a = pop16(u->src); push16(u->src, b); push16(u->src, c); push16(u->src, a); }
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/* Logic(16-bits) */
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void op_equ16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b == a); }
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void op_neq16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b != a); }
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void op_gth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b > a); }
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void op_lth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b < a); }
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void op_gts16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, (Sint16)b > (Sint16)a); }
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void op_lts16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, (Sint16)b < (Sint16)a); }
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/* Memory(16-bits) */
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void op_pek16(Uxn *u) { Uint16 a = pop16(u->src); push8(u->src, mempeek8(u, a)); }
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void op_pok16(Uxn *u) { Uint16 a = pop16(u->src); Uint8 b = pop8(u->src); mempoke8(u, a, b); }
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void op_ldr16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->src, mempeek16(u, a)); }
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void op_str16(Uxn *u) { Uint16 a = pop16(u->src); Uint16 b = pop16(u->src); mempoke16(u, a, b); }
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void op_jmp16(Uxn *u) { u->ram.ptr = pop16(u->src); }
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void op_jnz16(Uxn *u) { Uint16 a = pop16(u->src); Uint8 b = pop8(u->src); if (b) u->ram.ptr = a; }
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void op_jsr16(Uxn *u) { push16(u->dst, u->ram.ptr); u->ram.ptr = pop16(u->src); }
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void op_sth16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->dst, a); }
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/* Arithmetic(16-bits) */
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void op_add16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b + a); }
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void op_sub16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b - a); }
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void op_mul16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b * a); }
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void op_div16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b / a); }
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void op_and16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b & a); }
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void op_ora16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b | a); }
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void op_eor16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b ^ a); }
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void op_sft16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b >> ((a & 0x000f) % 16) << (((a & 0x00f0) >> 4) % 16)); }
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void (*ops[])(Uxn *u) = {
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op_brk, op_nop, op_lit, op_pop, op_dup, op_swp, op_ovr, op_rot,
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op_equ, op_neq, op_gth, op_lth, op_gts, op_lts, op_nop, op_nop,
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op_pek, op_pok, op_ldr, op_str, op_jmp, op_jnz, op_jsr, op_sth,
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op_add, op_sub, op_mul, op_div, op_and, op_ora, op_eor, op_sft,
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/* 16-bit */
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op_brk, op_nop16, op_lit16, op_pop16, op_dup16, op_swp16, op_ovr16, op_rot16,
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op_equ16, op_neq16, op_gth16, op_lth16, op_gts16, op_lts16, op_nop, op_nop,
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op_pek16, op_pok16, op_ldr16, op_str16, op_jmp16, op_jnz16, op_jsr16, op_sth16,
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op_add16, op_sub16, op_mul16, op_div16, op_and16, op_ora16, op_eor16, op_sft16
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};
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/* clang-format on */
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#pragma mark - Core
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int
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haltuxn(Uxn *u, char *name, int id)
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{
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printf("Halted: %s#%04x, at 0x%04x\n", name, id, u->counter);
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return 0;
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}
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void
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lituxn(Uxn *u, Uint8 instr)
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{
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push8(&u->wst, instr);
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u->literal--;
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}
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void
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opcuxn(Uxn *u, Uint8 instr)
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{
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Uint8 op = instr & 0x3f, freturn;
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setflag(&u->status, FLAG_RETURN, (instr >> 6) & 1);
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freturn = getflag(&u->status, FLAG_RETURN);
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u->src = freturn ? &u->rst : &u->wst;
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u->dst = freturn ? &u->wst : &u->rst;
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(*ops[op])(u);
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}
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int
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stepuxn(Uxn *u, Uint8 instr)
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{
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if(u->literal > 0)
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lituxn(u, instr);
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else
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opcuxn(u, instr);
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if(u->wst.error)
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return haltuxn(u, u->wst.error == 1 ? "Working-stack underflow" : "Working-stack overflow", instr);
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if(u->rst.error)
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return haltuxn(u, u->rst.error == 1 ? "Return-stack underflow" : "Return-stack overflow", instr);
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return 1;
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}
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int
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evaluxn(Uxn *u, Uint16 vec)
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{
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u->literal = 0;
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u->ram.ptr = vec;
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u->wst.error = 0;
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u->rst.error = 0;
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setflag(&u->status, FLAG_HALT, 0);
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while(!(u->status & FLAG_HALT)) {
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Uint8 instr = u->ram.dat[u->ram.ptr++];
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if(!stepuxn(u, instr))
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return 0;
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u->counter++;
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}
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return 1;
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}
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int
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bootuxn(Uxn *u)
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{
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size_t i;
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char *cptr = (char *)u;
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for(i = 0; i < sizeof(*u); i++)
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cptr[i] = 0;
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return 1;
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}
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int
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loaduxn(Uxn *u, char *filepath)
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{
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FILE *f;
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if(!(f = fopen(filepath, "rb")))
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return haltuxn(u, "Missing input rom.", 0);
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fread(u->ram.dat, sizeof(u->ram.dat), 1, f);
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u->vreset = mempeek16(u, PAGE_DEVICE + 0x00f0);
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u->vframe = mempeek16(u, PAGE_DEVICE + 0x00f2);
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u->verror = mempeek16(u, PAGE_DEVICE + 0x00f4);
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printf("Uxn loaded[%s] vrst:%04x vfrm:%04x verr:%04x.\n",
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filepath,
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u->vreset,
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u->vframe,
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u->verror);
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return 1;
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}
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Device *
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portuxn(Uxn *u, char *name, Uint8 (*pofn)(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1))
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{
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Device *d = &u->dev[u->devices++];
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d->addr = PAGE_DEVICE + (u->devices - 1) * 0x10;
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d->poke = pofn;
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printf("Device #%d: %s, at 0x%04x \n", u->devices - 1, name, d->addr);
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return d;
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}
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