mirror of https://git.sr.ht/~rabbits/uxn
Removed global
This commit is contained in:
neauoire
parent
608b9d4f1f
commit
d84e982031
218
cpu.c
218
cpu.c
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@ -18,23 +18,23 @@ WITH REGARD TO THIS SOFTWARE.
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#define FLAG_SIGN 0x04
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#define FLAG_COND 0x08
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Computer cpu;
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Cpu cpu;
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#pragma mark - Helpers
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void
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setflag(char flag, int b)
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setflag(Cpu *c, char flag, int b)
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{
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if(b)
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cpu.status |= flag;
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c->status |= flag;
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else
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cpu.status &= (~flag);
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c->status &= (~flag);
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}
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int
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getflag(char flag)
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getflag(Cpu *c, char flag)
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{
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return cpu.status & flag;
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return c->status & flag;
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}
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void
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@ -68,64 +68,64 @@ echom(Memory *m, Uint8 len, char *name)
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/* clang-format off */
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Uint16 bytes2short(Uint8 a, Uint8 b) { return (a << 8) + b; }
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Uint16 mempeek16(Uint16 s) { return (cpu.ram.dat[s] << 8) + (cpu.ram.dat[s+1] & 0xff); }
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void wspush8(Uint8 b) { cpu.wst.dat[cpu.wst.ptr++] = b; }
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void wspush16(Uint16 s) { wspush8(s >> 8); wspush8(s & 0xff); }
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Uint8 wspop8(void) { return cpu.wst.dat[--cpu.wst.ptr]; }
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Uint16 wspop16(void) { return wspop8() + (wspop8() << 8); }
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Uint8 wspeek8(Uint8 o) { return cpu.wst.dat[cpu.wst.ptr - o]; }
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Uint16 wspeek16(Uint8 o) { return bytes2short(cpu.wst.dat[cpu.wst.ptr - o], cpu.wst.dat[cpu.wst.ptr - o + 1]); }
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Uint16 rspop16(void) { return cpu.rst.dat[--cpu.rst.ptr]; }
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void rspush16(Uint16 a) { cpu.rst.dat[cpu.rst.ptr++] = a; }
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Uint16 mempeek16(Cpu *c, Uint16 s) { return (c->ram.dat[s] << 8) + (c->ram.dat[s+1] & 0xff); }
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void wspush8(Cpu *c, Uint8 b) { c->wst.dat[c->wst.ptr++] = b; }
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void wspush16(Cpu *c, Uint16 s) { wspush8(c,s >> 8); wspush8(c,s & 0xff); }
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Uint8 wspop8(Cpu *c) { return c->wst.dat[--c->wst.ptr]; }
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Uint16 wspop16(Cpu *c) { return wspop8(c) + (wspop8(c) << 8); }
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Uint8 wspeek8(Cpu *c, Uint8 o) { return c->wst.dat[c->wst.ptr - o]; }
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Uint16 wspeek16(Cpu *c, Uint8 o) { return bytes2short(c->wst.dat[c->wst.ptr - o], c->wst.dat[c->wst.ptr - o + 1]); }
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Uint16 rspop16(Cpu *c) { return c->rst.dat[--c->rst.ptr]; }
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void rspush16(Cpu *c, Uint16 a) { c->rst.dat[c->rst.ptr++] = a; }
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/* I/O */
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void op_brk() { setflag(FLAG_HALT, 1); }
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void op_lit() { cpu.literal += cpu.ram.dat[cpu.ram.ptr++]; }
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void op_nop() { printf("NOP");}
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void op_ldr() { wspush8(cpu.ram.dat[wspop16()]); }
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void op_str() { cpu.ram.dat[wspop16()] = wspop8(); }
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void op_brk(Cpu *c) { setflag(c,FLAG_HALT, 1); }
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void op_lit(Cpu *c) { c->literal += c->ram.dat[c->ram.ptr++]; }
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void op_nop(Cpu *c) { printf("NOP");}
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void op_ldr(Cpu *c) { wspush8(c,c->ram.dat[wspop16(c)]); }
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void op_str(Cpu *c) { c->ram.dat[wspop16(c)] = wspop8(c); }
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/* Logic */
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void op_jmp() { cpu.ram.ptr = wspop16(); }
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void op_jsr() { rspush16(cpu.ram.ptr); cpu.ram.ptr = wspop16(); }
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void op_rts() { cpu.ram.ptr = rspop16(); }
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void op_jmp(Cpu *c) { c->ram.ptr = wspop16(c); }
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void op_jsr(Cpu *c) { rspush16(c,c->ram.ptr); c->ram.ptr = wspop16(c); }
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void op_rts(Cpu *c) { c->ram.ptr = rspop16(c); }
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/* Stack */
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void op_pop() { wspop8(); }
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void op_dup() { wspush8(wspeek8(1)); }
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void op_swp() { Uint8 b = wspop8(), a = wspop8(); wspush8(b); wspush8(a); }
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void op_ovr() { Uint8 a = wspeek8(2); wspush8(a); }
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void op_rot() { Uint8 c = wspop8(),b = wspop8(),a = wspop8(); wspush8(b); wspush8(c); wspush8(a); }
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void op_and() { Uint8 a = wspop8(), b = wspop8(); wspush8(a & b); }
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void op_ora() { Uint8 a = wspop8(), b = wspop8(); wspush8(a | b); }
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void op_rol() { Uint8 a = wspop8(), b = wspop8(); wspush8(a << b); }
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void op_pop(Cpu *c) { wspop8(c); }
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void op_dup(Cpu *c) { wspush8(c,wspeek8(c,1)); }
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void op_swp(Cpu *c) { Uint8 b = wspop8(c), a = wspop8(c); wspush8(c,b); wspush8(c,a); }
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void op_ovr(Cpu *c) { Uint8 a = wspeek8(c,2); wspush8(c,a); }
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void op_rot(Cpu *c) { Uint8 c1 = wspop8(c),b = wspop8(c),a = wspop8(c); wspush8(c,b); wspush8(c,c1); wspush8(c,a); }
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void op_and(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,a & b); }
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void op_ora(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,a | b); }
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void op_rol(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,a << b); }
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/* Arithmetic */
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void op_add() { Uint8 a = wspop8(), b = wspop8(); wspush8(b + a); }
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void op_sub() { Uint8 a = wspop8(), b = wspop8(); wspush8(b - a); }
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void op_mul() { Uint8 a = wspop8(), b = wspop8(); wspush8(b * a); }
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void op_div() { Uint8 a = wspop8(), b = wspop8(); wspush8(b / a); }
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void op_equ() { Uint8 a = wspop8(), b = wspop8(); wspush8(b == a); }
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void op_neq() { Uint8 a = wspop8(), b = wspop8(); wspush8(b != a); }
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void op_gth() { Uint8 a = wspop8(), b = wspop8(); wspush8(b > a); }
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void op_lth() { Uint8 a = wspop8(), b = wspop8(); wspush8(b < a); }
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void op_add(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b + a); }
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void op_sub(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b - a); }
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void op_mul(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b * a); }
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void op_div(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b / a); }
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void op_equ(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b == a); }
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void op_neq(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b != a); }
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void op_gth(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b > a); }
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void op_lth(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b < a); }
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/* Stack(16-bits) */
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void op_pop16() { wspop16(); }
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void op_dup16() { wspush16(wspeek16(2)); }
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void op_swp16() { Uint16 b = wspop16(), a = wspop16(); wspush16(b); wspush16(a); }
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void op_ovr16() { Uint16 a = wspeek16(4); wspush16(a); }
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void op_rot16() { Uint16 c = wspop16(), b = wspop16(), a = wspop16(); wspush16(b); wspush16(c); wspush16(a); }
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void op_and16() { Uint16 a = wspop16(), b = wspop16(); wspush16(a & b); }
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void op_ora16() { Uint16 a = wspop16(), b = wspop16(); wspush16(a | b); }
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void op_rol16() { Uint16 a = wspop16(), b = wspop16(); wspush16(a << b); }
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void op_pop16(Cpu *c) { wspop16(c); }
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void op_dup16(Cpu *c) { wspush16(c,wspeek16(c,2)); }
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void op_swp16(Cpu *c) { Uint16 b = wspop16(c), a = wspop16(c); wspush16(c,b); wspush16(c,a); }
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void op_ovr16(Cpu *c) { Uint16 a = wspeek16(c, 4); wspush16(c,a); }
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void op_rot16(Cpu *c) { Uint16 c1 = wspop16(c), b = wspop16(c), a = wspop16(c); wspush16(c,b); wspush16(c,c1); wspush16(c,a); }
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void op_and16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,a & b); }
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void op_ora16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,a | b); }
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void op_rol16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,a << b); }
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/* Arithmetic(16-bits) */
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void op_add16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b + a); }
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void op_sub16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b - a); }
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void op_mul16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b * a); }
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void op_div16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b / a); }
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void op_equ16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b == a); }
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void op_neq16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b != a); }
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void op_gth16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b > a); }
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void op_lth16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b < a); }
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void op_add16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b + a); }
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void op_sub16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b - a); }
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void op_mul16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b * a); }
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void op_div16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b / a); }
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void op_equ16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b == a); }
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void op_neq16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b != a); }
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void op_gth16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b > a); }
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void op_lth16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b < a); }
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void (*ops[])() = {
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void (*ops[])(Cpu *c) = {
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op_brk, op_lit, op_nop, op_nop, op_nop, op_nop, 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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@ -146,95 +146,105 @@ Uint8 opr[][2] = {
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/* clang-format on */
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int
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error(char *name, int id)
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error(Cpu *c, char *name, int id)
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{
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printf("Error: %s[%04x], at 0x%04x\n", name, id, cpu.counter);
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printf("Error: %s[%04x], at 0x%04x\n", name, id, c->counter);
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return 0;
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}
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int
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doliteral(Uint8 instr)
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doliteral(Cpu *c, Uint8 instr)
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{
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if(cpu.wst.ptr >= 255)
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return error("Stack overflow", instr);
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wspush8(instr);
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cpu.literal--;
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if(c->wst.ptr >= 255)
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return error(c, "Stack overflow", instr);
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wspush8(c, instr);
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c->literal--;
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return 1;
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}
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int
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dodevices(void) /* experimental */
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dodevices(Cpu *c) /* experimental */
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{
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if(cpu.ram.dat[0xfff1]) {
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printf("%c", cpu.ram.dat[0xfff1]);
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cpu.ram.dat[0xfff1] = 0x00;
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if(c->ram.dat[0xfff1]) {
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printf("%c", c->ram.dat[0xfff1]);
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c->ram.dat[0xfff1] = 0x00;
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}
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return 1;
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}
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int
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doopcode(Uint8 instr)
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doopcode(Cpu *c, Uint8 instr)
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{
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Uint8 op = instr & 0x1f;
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setflag(FLAG_SHORT, (instr >> 5) & 1);
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setflag(FLAG_SIGN, (instr >> 6) & 1); /* usused */
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setflag(FLAG_COND, (instr >> 7) & 1);
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if(getflag(FLAG_SHORT))
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setflag(c, FLAG_SHORT, (instr >> 5) & 1);
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setflag(c, FLAG_SIGN, (instr >> 6) & 1); /* usused */
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setflag(c, FLAG_COND, (instr >> 7) & 1);
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if(getflag(c, FLAG_SHORT))
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op += 16;
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if(cpu.wst.ptr < opr[op][0])
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return error("Stack underflow", op);
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if(cpu.wst.ptr + opr[op][1] - opr[op][0] >= 255)
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return error("Stack overflow", instr);
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if(!getflag(FLAG_COND) || (getflag(FLAG_COND) && wspop8()))
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(*ops[op])();
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dodevices();
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if(c->wst.ptr < opr[op][0])
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return error(c, "Stack underflow", op);
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if(c->wst.ptr + opr[op][1] - opr[op][0] >= 255)
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return error(c, "Stack overflow", instr);
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if(!getflag(c, FLAG_COND) || (getflag(c, FLAG_COND) && wspop8(c)))
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(*ops[op])(c);
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dodevices(c);
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return 1;
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}
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int
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eval(void)
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eval(Cpu *c)
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{
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Uint8 instr = cpu.ram.dat[cpu.ram.ptr++];
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if(cpu.literal > 0)
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return doliteral(instr);
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Uint8 instr = c->ram.dat[c->ram.ptr++];
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if(c->literal > 0)
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return doliteral(c, instr);
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else
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return doopcode(instr);
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return doopcode(c, instr);
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return 1;
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}
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int
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load(FILE *f)
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load(Cpu *c, FILE *f)
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{
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fread(cpu.ram.dat, sizeof(cpu.ram.dat), 1, f);
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fread(c->ram.dat, sizeof(c->ram.dat), 1, f);
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return 1;
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}
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void
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echof(void)
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echof(Cpu *c)
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{
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printf("ended @ %d steps | hf: %x sf: %x sf: %x cf: %x\n",
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cpu.counter,
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getflag(FLAG_HALT) != 0,
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getflag(FLAG_SHORT) != 0,
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getflag(FLAG_SIGN) != 0,
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getflag(FLAG_COND) != 0);
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c->counter,
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getflag(c, FLAG_HALT) != 0,
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getflag(c, FLAG_SHORT) != 0,
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getflag(c, FLAG_SIGN) != 0,
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getflag(c, FLAG_COND) != 0);
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}
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void
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reset(Cpu *c)
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{
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size_t i;
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char *cptr = (char *)c;
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for(i = 0; i < sizeof c; i++)
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cptr[i] = 0;
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}
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int
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boot(void)
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boot(Cpu *c)
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{
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cpu.vreset = mempeek16(0xfffa);
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cpu.vframe = mempeek16(0xfffc);
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cpu.verror = mempeek16(0xfffe);
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reset(c);
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c->vreset = mempeek16(c, 0xfffa);
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c->vframe = mempeek16(c, 0xfffc);
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c->verror = mempeek16(c, 0xfffe);
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/* eval reset */
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cpu.ram.ptr = cpu.vreset;
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setflag(FLAG_HALT, 0);
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while(!(cpu.status & FLAG_HALT) && eval())
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cpu.counter++;
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c->ram.ptr = c->vreset;
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setflag(c, FLAG_HALT, 0);
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while(!(c->status & FLAG_HALT) && eval(c))
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c->counter++;
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/*eval frame */
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cpu.ram.ptr = cpu.vframe;
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setflag(FLAG_HALT, 0);
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while(!(cpu.status & FLAG_HALT) && eval())
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cpu.counter++;
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c->ram.ptr = c->vframe;
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setflag(c, FLAG_HALT, 0);
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while(!(c->status & FLAG_HALT) && eval(c))
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c->counter++;
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return 1;
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}
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10
cpu.h
10
cpu.h
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@ -35,11 +35,11 @@ typedef struct {
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Stack8 wst;
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Stack16 rst;
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Memory ram;
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} Computer;
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} Cpu;
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int error(char *name, int id);
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int load(FILE *f);
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int boot(void);
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void echof(void);
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int error(Cpu *c, char *name, int id);
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int load(Cpu *c, FILE *f);
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int boot(Cpu *c);
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void echof(Cpu *c);
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void echom(Memory *m, Uint8 len, char *name);
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void echos(Stack8 *s, Uint8 len, char *name);
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16
uxn.c
16
uxn.c
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@ -16,18 +16,18 @@ int
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main(int argc, char *argv[])
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{
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FILE *f;
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Computer cpu;
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Cpu cpu;
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if(argc < 2)
|
||||
return error("No input.", 0);
|
||||
return error(&cpu, "No input.", 0);
|
||||
if(!(f = fopen(argv[1], "rb")))
|
||||
return error("Missing input.", 0);
|
||||
if(!load(f))
|
||||
return error("Load error", 0);
|
||||
if(!boot())
|
||||
return error("Boot error", 0);
|
||||
return error(&cpu, "Missing input.", 0);
|
||||
if(!load(&cpu, f))
|
||||
return error(&cpu, "Load error", 0);
|
||||
if(!boot(&cpu))
|
||||
return error(&cpu, "Boot error", 0);
|
||||
/* print result */
|
||||
echos(&cpu.wst, 0x40, "stack");
|
||||
echom(&cpu.ram, 0x40, "ram");
|
||||
echof();
|
||||
echof(&cpu);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue