mirror of https://git.sr.ht/~rabbits/uxn
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
#include <stdio.h>
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#include "../uxn.h"
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#include "system.h"
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/*
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Copyright (c) 2022 Devine Lu Linvega, Andrew Alderwick
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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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static const char *errors[] = {
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"Working-stack underflow",
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"Return-stack underflow",
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"Working-stack overflow",
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"Return-stack overflow",
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"Working-stack division by zero",
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"Return-stack division by zero",
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"Execution timeout"};
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static void
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system_print(Stack *s, char *name)
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{
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Uint8 i;
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fprintf(stderr, "<%s>", name);
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for(i = 0; i < s->ptr; i++)
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fprintf(stderr, " %02x", s->dat[i]);
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if(!i)
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fprintf(stderr, " empty");
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fprintf(stderr, "\n");
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}
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void
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system_inspect(Uxn *u)
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{
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system_print(&u->wst, "wst");
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system_print(&u->rst, "rst");
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}
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int
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uxn_halt(Uxn *u, Uint8 error, Uint16 addr)
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{
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system_inspect(u);
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fprintf(stderr, "Halted: %s#%04x, at 0x%04x\n", errors[error], u->ram[addr], addr);
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return 0;
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}
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/* IO */
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Uint8
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system_dei(Device *d, Uint8 port)
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{
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switch(port) {
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case 0x2: return d->u->wst.ptr;
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case 0x3: return d->u->rst.ptr;
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default: return d->dat[port];
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}
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}
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void
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system_deo(Device *d, Uint8 port)
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{
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switch(port) {
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case 0x2: d->u->wst.ptr = d->dat[port]; break;
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case 0x3: d->u->rst.ptr = d->dat[port]; break;
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case 0xe: system_inspect(d->u); break;
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default: system_deo_special(d, port);
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}
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}
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