214 lines
8.8 KiB
C
214 lines
8.8 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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void mempoke8(Memory *m, Uint16 a, Uint8 b) { m->dat[a] = b; }
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Uint8 mempeek8(Memory *m, Uint16 a) { return m->dat[a]; }
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void mempoke16(Memory *m, Uint16 a, Uint16 b) { mempoke8(m, a, b >> 8); mempoke8(m, a + 1, b); }
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Uint16 mempeek16(Memory *m, Uint16 a) { return (mempeek8(m, a) << 8) + mempeek8(m, a + 1); }
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void push8(St8 *s, Uint8 a) { s->dat[s->ptr++] = a; }
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Uint8 pop8(St8 *s) { return s->dat[--s->ptr]; }
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Uint8 peek8(St8 *s, Uint8 a) { return s->dat[s->ptr - a]; }
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void push16(St8 *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }
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Uint16 pop16(St8 *s) { return pop8(s) + (pop8(s) << 8); }
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Uint16 peek16(St8 *s, Uint8 a) { return (peek8(s, a) << 8) + peek8(s, a + 1); }
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/* I/O */
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void op_brk(Uxn *u) { setflag(&u->status,FLAG_HALT, 1); }
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void op_li1(Uxn *u) { u->literal += 1; }
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void op_lix(Uxn *u) { u->literal += u->ram.dat[u->ram.ptr++]; }
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void op_nop(Uxn *u) { printf("NOP"); (void)u; }
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void op_ior(Uxn *u) { Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push8(&u->wst, dev->read(dev, pop8(&u->wst))); }
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void op_iow(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) dev->write(dev, a); }
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void op_ldr(Uxn *u) { Uint16 a = pop16(&u->wst); push8(&u->wst, mempeek8(&u->ram, a)); }
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void op_str(Uxn *u) { Uint16 a = pop16(&u->wst); Uint8 b = pop8(&u->wst); mempoke8(&u->ram, a, b); }
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/* Logic */
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void op_jmp(Uxn *u) { u->ram.ptr = pop16(&u->wst); }
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void op_jsr(Uxn *u) { push16(&u->rst, u->ram.ptr); u->ram.ptr = pop16(&u->wst); }
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void op_rts(Uxn *u) { u->ram.ptr = pop16(&u->rst); }
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/* Stack */
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void op_pop(Uxn *u) { pop8(&u->wst); }
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void op_dup(Uxn *u) { push8(&u->wst, peek8(&u->wst, 1)); }
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void op_swp(Uxn *u) { Uint8 b = pop8(&u->wst), a = pop8(&u->wst); push8(&u->wst, b); push8(&u->wst, a); }
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void op_ovr(Uxn *u) { Uint8 a = peek8(&u->wst,2); push8(&u->wst, a); }
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void op_rot(Uxn *u) { Uint8 c = pop8(&u->wst), b = pop8(&u->wst), a = pop8(&u->wst); push8(&u->wst, b); push8(&u->wst, c); push8(&u->wst, a); }
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void op_and(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b & a); }
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void op_ora(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b | a); }
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void op_rol(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b << a); }
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/* Arithmetic */
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void op_add(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b + a); }
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void op_sub(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b - a); }
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void op_mul(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b * a); }
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void op_div(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b / a); }
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void op_equ(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b == a); }
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void op_neq(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b != a); }
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void op_gth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b > a); }
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void op_lth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b < a); }
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/* --- */
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void op_ior16(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push16(&u->wst, (dev->read(dev, a) << 8) + dev->read(dev, a + 1)); }
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void op_iow16(Uxn *u) { Uint8 a = pop8(&u->wst); Uint8 b = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) { dev->write(dev, b); dev->write(dev, a); } }
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void op_ldr16(Uxn *u) { Uint16 a = pop16(&u->wst); push16(&u->wst, mempeek16(&u->ram, a)); }
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void op_str16(Uxn *u) { Uint16 a = pop16(&u->wst); Uint16 b = pop16(&u->wst); mempoke16(&u->ram, a, b); }
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/* Stack(16-bits) */
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void op_pop16(Uxn *u) { pop16(&u->wst); }
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void op_dup16(Uxn *u) { push16(&u->wst, peek16(&u->wst, 2)); }
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void op_swp16(Uxn *u) { Uint16 b = pop16(&u->wst), a = pop16(&u->wst); push16(&u->wst, b); push16(&u->wst, a); }
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void op_ovr16(Uxn *u) { Uint16 a = peek16(&u->wst, 4); push16(&u->wst, a); }
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void op_rot16(Uxn *u) { Uint16 c = pop16(&u->wst), b = pop16(&u->wst), a = pop16(&u->wst); push16(&u->wst, b); push16(&u->wst, c); push16(&u->wst, a); }
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void op_and16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b & a); }
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void op_ora16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b | a); }
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void op_rol16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b << a); }
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/* Arithmetic(16-bits) */
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void op_add16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b + a); }
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void op_sub16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b - a); }
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void op_mul16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b * a); }
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void op_div16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b / a); }
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void op_equ16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, b == a); }
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void op_neq16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, b != a); }
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void op_gth16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, b > a); }
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void op_lth16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, b < a); }
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void (*ops[])(Uxn *u) = {
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op_brk, op_nop, op_li1, op_lix, op_ior, op_iow, op_ldr, op_str,
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op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
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op_pop, op_dup, op_swp, op_ovr, op_rot, op_and, op_ora, op_rol,
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op_add, op_sub, op_mul, op_div, op_equ, op_neq, op_gth, op_lth,
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/* 16-bit */
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op_brk, op_nop, op_li1, op_lix, op_ior16, op_iow16, op_ldr16, op_str16,
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op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
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op_pop16, op_dup16, op_swp16, op_ovr16, op_rot16, op_and16, op_ora16, op_rol16,
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op_add16, op_sub16, op_mul16, op_div16, op_equ16, op_neq16, op_gth16, op_lth16
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};
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Uint8 opr[][2] = {
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{0,0}, {0,0}, {0,0}, {0,0}, {1,1}, {1,0}, {2,1}, {3,0},
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{2,0}, {2,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0},
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{1,0}, {1,2}, {2,2}, {3,3}, {3,3}, {2,1}, {2,1}, {2,1},
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{2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1},
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/* 16-bit */
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{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
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{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
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{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
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{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0} /* TODO */
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};
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/* clang-format on */
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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("Error: %s#%04x, at 0x%04x\n", name, id, u->counter);
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return 0;
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}
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int
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lituxn(Uxn *u, Uint8 instr)
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{
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if(u->wst.ptr >= 255)
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return haltuxn(u, "Stack overflow", instr);
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push8(&u->wst, instr);
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u->literal--;
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return 1;
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}
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int
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opcuxn(Uxn *u, Uint8 instr)
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{
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Uint8 op = instr & 0x1f;
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setflag(&u->status, FLAG_SHORT, (instr >> 5) & 1);
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setflag(&u->status, FLAG_SIGN, (instr >> 6) & 1); /* usused */
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setflag(&u->status, FLAG_COND, (instr >> 7) & 1);
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if(getflag(&u->status, FLAG_SHORT))
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op += 32;
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if(u->wst.ptr < opr[op][0])
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return haltuxn(u, "Stack underflow", op);
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if(u->wst.ptr + opr[op][1] - opr[op][0] >= 255)
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return haltuxn(u, "Stack overflow", instr);
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if(!getflag(&u->status, FLAG_COND) || (getflag(&u->status, FLAG_COND) && pop8(&u->wst)))
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(*ops[op])(u);
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return 1;
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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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return lituxn(u, instr);
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else
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return opcuxn(u, instr);
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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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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.", 0);
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fread(u->ram.dat, sizeof(u->ram.dat), 1, f);
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u->devr = 0xfff8;
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u->devw = 0xfff9;
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u->vreset = mempeek16(&u->ram, 0xfffa);
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u->vframe = mempeek16(&u->ram, 0xfffc);
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u->verror = mempeek16(&u->ram, 0xfffe);
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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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/* to start: evaluxn(u, u->vreset); */
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Device *
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portuxn(Uxn *u, char *name, Uint8 (*rfn)(Device *, Uint8), Uint8 (*wfn)(Device *, Uint8))
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{
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Device *d = &u->dev[u->devices++];
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d->read = rfn;
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d->write = wfn;
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d->len = 0;
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printf("Device #%d: %s \n", u->devices - 1, name);
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return d;
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}
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