mirror of https://git.sr.ht/~rabbits/uxn-utils
(ref) Basic implementation
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AlignOperands: DontAlign
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AllowShortBlocksOnASingleLine: Always
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AllowShortCaseLabelsOnASingleLine: true
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AllowShortEnumsOnASingleLine: true
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AllowShortIfStatementsOnASingleLine: true
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AllowShortLoopsOnASingleLine: true
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AlwaysBreakAfterDefinitionReturnType: TopLevel
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BinPackArguments: false
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BinPackParameters: false
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BreakBeforeBraces: WebKit
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ContinuationIndentWidth: 4
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UseTab: ForContinuationAndIndentation
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ColumnLimit: 0
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@ -2,7 +2,7 @@
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*jpg
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*png
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*bmp
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/bin
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*/bin
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*snarf
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*notepad
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*theme
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@ -10,3 +10,4 @@
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*rom
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*sym
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.PHONY: all run format clean
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all: bin/uxn
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run: all
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@ bin/uxn test.bin
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format:
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@ clang-format -i uxn.c
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clean:
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@ rm -r -f bin
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bin/uxn: uxn.c
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@ mkdir -p bin/
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@ cc uxn.c -o bin/uxn
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Binary file not shown.
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#include <stdio.h>
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#include <stdlib.h>
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/* clang-format off */
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#define PEEK2(d) (*(d) << 8 | (d)[1])
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#define POKE2(d, v) { *(d) = (v) >> 8; (d)[1] = (v); }
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#define CONSOLE_STD 0x1
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#define CONSOLE_ARG 0x2
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#define CONSOLE_EOA 0x3
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#define CONSOLE_END 0x4
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#define PAGE_PROGRAM 0x0100
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#define RAM_PAGES 0x10
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/* clang-format on */
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typedef unsigned char Uint8;
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typedef signed char Sint8;
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typedef unsigned short Uint16;
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typedef signed short Sint16;
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typedef unsigned int Uint32;
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typedef struct {
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Uint8 dat[0x100], ptr;
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} Stack;
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typedef struct Uxn {
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Uint8 *ram, dev[0x100];
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Stack wst, rst;
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} Uxn;
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int uxn_eval(Uxn *u, Uint16 pc);
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int
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system_error(char *msg, const char *err)
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{
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fprintf(stderr, "%s %s\n", msg, err);
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fflush(stderr);
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return 0;
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}
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static void
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system_zero(Uxn *u, int soft)
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{
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int i;
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for(i = PAGE_PROGRAM * soft; i < 0x10000; i++)
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u->ram[i] = 0;
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for(i = 0x0; i < 0x100; i++)
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u->dev[i] = 0;
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u->wst.ptr = u->rst.ptr = 0;
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}
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char *boot_rom;
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static int
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system_load(Uxn *u, char *filename)
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{
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int l, i = 0;
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FILE *f = fopen(filename, "rb");
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if(!f)
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return 0;
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l = fread(&u->ram[PAGE_PROGRAM], 0x10000 - PAGE_PROGRAM, 1, f);
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while(l && ++i < RAM_PAGES)
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l = fread(u->ram + 0x10000 * i, 0x10000, 1, f);
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fclose(f);
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return 1;
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}
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int
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system_init(Uxn *u, Uint8 *ram, char *rom)
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{
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u->ram = ram;
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system_zero(u, 0);
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if(!system_load(u, rom))
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if(!system_load(u, "boot.rom"))
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return system_error("Init", "Failed to load rom.");
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boot_rom = rom;
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return 1;
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}
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int
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console_input(Uxn *u, char c, int type)
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{
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Uint8 *d = &u->dev[0x10];
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d[0x2] = c;
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d[0x7] = type;
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return uxn_eval(u, PEEK2(d));
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}
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void
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console_listen(Uxn *u, int i, int argc, char **argv)
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{
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for(; i < argc; i++) {
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char *p = argv[i];
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while(*p) console_input(u, *p++, CONSOLE_ARG);
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console_input(u, '\n', i == argc - 1 ? CONSOLE_END : CONSOLE_EOA);
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}
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}
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void
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console_deo(Uint8 *d, Uint8 port)
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{
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switch(port) {
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case 0x8:
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fputc(d[port], stdout);
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fflush(stdout);
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return;
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case 0x9:
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fputc(d[port], stderr);
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fflush(stderr);
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return;
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}
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}
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Uint8
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emu_dei(Uxn *u, Uint8 addr)
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{
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return u->dev[addr];
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}
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void
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emu_deo(Uxn *u, Uint8 addr, Uint8 value)
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{
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Uint8 p = addr & 0x0f, d = addr & 0xf0;
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u->dev[addr] = value;
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switch(d) {
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case 0x10: console_deo(&u->dev[d], p); break;
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}
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}
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#define FLIP { s = ins & 0x40 ? &u->wst : &u->rst; }
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#define JUMP(x) { if(m2) pc = (x); else pc += (Sint8)(x); }
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#define POP1(o) { o = s->dat[--*sp]; }
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#define POP2(o) { o = s->dat[--*sp] | (s->dat[--*sp] << 0x8); }
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#define POPx(o) { if(m2) { POP2(o) } else POP1(o) }
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#define PUSH1(y) { s->dat[s->ptr++] = (y); }
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#define PUSH2(y) { tt = (y); s->dat[s->ptr++] = tt >> 0x8; s->dat[s->ptr++] = tt; }
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#define PUSHx(y) { if(m2) { PUSH2(y) } else PUSH1(y) }
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#define PEEK(o, x, r) { if(m2) { r = (x); o = ram[r++] << 8 | ram[r]; } else o = ram[(x)]; }
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#define POKE(x, y, r) { if(m2) { r = (x); ram[r++] = y >> 8; ram[r] = y; } else ram[(x)] = (y); }
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#define DEVR(o, p) { if(m2) { o = (emu_dei(u, p) << 8) | emu_dei(u, p + 1); } else o = emu_dei(u, p); }
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#define DEVW(p, y) { if(m2) { emu_deo(u, p, y >> 8); emu_deo(u, p + 1, y); } else emu_deo(u, p, y); }
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int
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uxn_eval(Uxn *u, Uint16 pc)
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{
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Uint8 t, kp, *sp, *ram = u->ram;
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Uint16 tt, a, b, c;
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if(!pc || u->dev[0x0f]) return 0;
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for(;;) {
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Uint8 ins = ram[pc++], m2 = ins & 0x20;
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Stack *s = ins & 0x40 ? &u->rst : &u->wst;
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if(ins & 0x80) kp = s->ptr, sp = &kp;
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else sp = &s->ptr;
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switch(ins & 0x1f) {
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case 0x00: case 0x20:
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switch(ins) {
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case 0x00: /* BRK */ return 1;
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case 0x20: /* JCI */ POP1(b) if(!b) { pc += 2; break; }
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case 0x40: /* JMI */ pc += PEEK2(ram + pc) + 2; break;
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case 0x60: /* JSI */ PUSH2(pc + 2) pc += PEEK2(ram + pc) + 2; break;
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case 0x80: case 0xc0: /* LIT */ PUSH1(ram[pc++]) break;
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case 0xa0: case 0xe0: /* LIT2 */ PUSH1(ram[pc++]) PUSH1(ram[pc++]) break;
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} break;
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case 0x01: /* INC */ POPx(a) PUSHx(a + 1) break;
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case 0x02: /* POP */ POPx(a) break;
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case 0x03: /* NIP */ POPx(a) POPx(b) PUSHx(a) break;
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case 0x04: /* SWP */ POPx(a) POPx(b) PUSHx(a) PUSHx(b) break;
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case 0x05: /* ROT */ POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) break;
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case 0x06: /* DUP */ POPx(a) PUSHx(a) PUSHx(a) break;
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case 0x07: /* OVR */ POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) break;
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case 0x08: /* EQU */ POPx(a) POPx(b) PUSH1(b == a) break;
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case 0x09: /* NEQ */ POPx(a) POPx(b) PUSH1(b != a) break;
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case 0x0a: /* GTH */ POPx(a) POPx(b) PUSH1(b > a) break;
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case 0x0b: /* LTH */ POPx(a) POPx(b) PUSH1(b < a) break;
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case 0x0c: /* JMP */ POPx(a) JUMP(a) break;
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case 0x0d: /* JCN */ POPx(a) POP1(b) if(b) JUMP(a) break;
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case 0x0e: /* JSR */ POPx(a) FLIP PUSH2(pc) JUMP(a) break;
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case 0x0f: /* STH */ POPx(a) FLIP PUSHx(a) break;
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case 0x10: /* LDZ */ POP1(a) PEEK(b, a, t) PUSHx(b) break;
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case 0x11: /* STZ */ POP1(a) POPx(b) POKE(a, b, t) break;
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case 0x12: /* LDR */ POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) break;
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case 0x13: /* STR */ POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) break;
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case 0x14: /* LDA */ POP2(a) PEEK(b, a, tt) PUSHx(b) break;
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case 0x15: /* STA */ POP2(a) POPx(b) POKE(a, b, tt) break;
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case 0x16: /* DEI */ POP1(a) DEVR(b, a) PUSHx(b) break;
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case 0x17: /* DEO */ POP1(a) POPx(b) DEVW(a, b) break;
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case 0x18: /* ADD */ POPx(a) POPx(b) PUSHx(b + a) break;
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case 0x19: /* SUB */ POPx(a) POPx(b) PUSHx(b - a) break;
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case 0x1a: /* MUL */ POPx(a) POPx(b) PUSHx((Uint32)b * a) break;
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case 0x1b: /* DIV */ POPx(a) POPx(b) PUSHx(a ? b / a : 0) break;
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case 0x1c: /* AND */ POPx(a) POPx(b) PUSHx(b & a) break;
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case 0x1d: /* ORA */ POPx(a) POPx(b) PUSHx(b | a) break;
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case 0x1e: /* EOR */ POPx(a) POPx(b) PUSHx(b ^ a) break;
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case 0x1f: /* SFT */ POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) break;
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}
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}
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}
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int
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main(int argc, char **argv)
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{
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int i = 1;
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Uxn u = {0};
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if(i == argc)
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return system_error("usage:", "uxncli [-v] file.rom [args..]");
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if(argv[i][0] == '-' && argv[i][1] == 'v')
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return system_error("Uxncli - Varvara Emulator(CLI)", "4 Jan 2024.");
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if(!system_init(&u, (Uint8 *)calloc(0x10000 * RAM_PAGES, sizeof(Uint8)), argv[i++]))
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return system_error("Init", "Failed to initialize uxn.");
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/* eval */
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u.dev[0x17] = argc - i;
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if(uxn_eval(&u, 0x0100)) {
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console_listen(&u, i, argc, argv);
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while(!u.dev[0x0f]) {
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char c = fgetc(stdin);
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if(c == EOF) {
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console_input(&u, 0x00, CONSOLE_END);
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break;
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}
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console_input(&u, (Uint8)c, CONSOLE_STD);
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}
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}
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free(u.ram);
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return u.dev[0x0f] & 0x7f;
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}
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