85 lines
3.6 KiB
C
85 lines
3.6 KiB
C
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#include "uxn.h"
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/*
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Copyright (u) 2022-2023 Devine Lu Linvega, Andrew Alderwick, Andrew Richards
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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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#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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#define next { ins = ram[pc++]; \
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m2 = ins & 0x20; \
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s = ins & 0x40 ? &u->rst : &u->wst; \
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if(ins & 0x80) kp = s->ptr, sp = &kp; else sp = &s->ptr; \
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goto *lut[ins & 0x1f]; }
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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, ins, m2, *ram = u->ram;
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Uint16 tt, a, b, c;
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Stack *s;
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static void* lut[] = {
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&&_imm, &&_inc, &&_pop, &&_nip, &&_swp, &&_rot, &&_dup, &&_ovr,
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&&_equ, &&_neq, &&_gth, &&_lth, &&_jmp, &&_jcn, &&_jsr, &&_sth,
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&&_ldz, &&_stz, &&_ldr, &&_str, &&_lda, &&_sta, &&_dei, &&_deo,
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&&_add, &&_sub, &&_mul, &&_div, &&_and, &&_ora, &&_eor, &&_sft };
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if(!pc || u->dev[0x0f]) return 0;
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next
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_imm:
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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 */ a = ram[pc++] << 8 | ram[pc++]; pc += a; break;
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case 0x60: /* JSI */ PUSH2(pc + 2) a = ram[pc++] << 8 | ram[pc++]; pc += a; 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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} next
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_inc: POPx(a) PUSHx(a + 1) next
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_pop: POPx(a) next
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_nip: POPx(a) POPx(b) PUSHx(a) next
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_swp: POPx(a) POPx(b) PUSHx(a) PUSHx(b) next
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_rot: POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) next
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_dup: POPx(a) PUSHx(a) PUSHx(a) next
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_ovr: POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) next
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_equ: POPx(a) POPx(b) PUSH1(b == a) next
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_neq: POPx(a) POPx(b) PUSH1(b != a) next
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_gth: POPx(a) POPx(b) PUSH1(b > a) next
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_lth: POPx(a) POPx(b) PUSH1(b < a) next
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_jmp: POPx(a) JUMP(a) next
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_jcn: POPx(a) POP1(b) if(b) JUMP(a) next
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_jsr: POPx(a) FLIP PUSH2(pc) JUMP(a) next
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_sth: POPx(a) FLIP PUSHx(a) next
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_ldz: POP1(a) PEEK(b, a, t) PUSHx(b) next
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_stz: POP1(a) POPx(b) POKE(a, b, t) next
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_ldr: POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) next
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_str: POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) next
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_lda: POP2(a) PEEK(b, a, tt) PUSHx(b) next
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_sta: POP2(a) POPx(b) POKE(a, b, tt) next
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_dei: POP1(a) DEVR(b, a) PUSHx(b) next
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_deo: POP1(a) POPx(b) DEVW(a, b) next
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_add: POPx(a) POPx(b) PUSHx(b + a) next
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_sub: POPx(a) POPx(b) PUSHx(b - a) next
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_mul: POPx(a) POPx(b) PUSHx(b * a) next
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_div: POPx(a) POPx(b) PUSHx(a ? b / a : 0) next
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_and: POPx(a) POPx(b) PUSHx(b & a) next
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_ora: POPx(a) POPx(b) PUSHx(b | a) next
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_eor: POPx(a) POPx(b) PUSHx(b ^ a) next
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_sft: POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) next
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}
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