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Removed global

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This commit is contained in:
neauoire 2021-02-08 13:56:56 -08:00
parent 608b9d4f1f
commit d84e982031
3 changed files with 127 additions and 117 deletions
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218
cpu.c
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@ -18,23 +18,23 @@ WITH REGARD TO THIS SOFTWARE.
#define FLAG_SIGN 0x04 #define FLAG_SIGN 0x04
#define FLAG_COND 0x08 #define FLAG_COND 0x08
Computer cpu; Cpu cpu;
#pragma mark - Helpers #pragma mark - Helpers
void void
setflag(char flag, int b) setflag(Cpu *c, char flag, int b)
{ {
if(b) if(b)
cpu.status |= flag; c->status |= flag;
else else
cpu.status &= (~flag); c->status &= (~flag);
} }
int int
getflag(char flag) getflag(Cpu *c, char flag)
{ {
return cpu.status & flag; return c->status & flag;
} }
void void
@ -68,64 +68,64 @@ echom(Memory *m, Uint8 len, char *name)
/* clang-format off */ /* clang-format off */
Uint16 bytes2short(Uint8 a, Uint8 b) { return (a << 8) + b; } Uint16 bytes2short(Uint8 a, Uint8 b) { return (a << 8) + b; }
Uint16 mempeek16(Uint16 s) { return (cpu.ram.dat[s] << 8) + (cpu.ram.dat[s+1] & 0xff); } Uint16 mempeek16(Cpu *c, Uint16 s) { return (c->ram.dat[s] << 8) + (c->ram.dat[s+1] & 0xff); }
void wspush8(Uint8 b) { cpu.wst.dat[cpu.wst.ptr++] = b; } void wspush8(Cpu *c, Uint8 b) { c->wst.dat[c->wst.ptr++] = b; }
void wspush16(Uint16 s) { wspush8(s >> 8); wspush8(s & 0xff); } void wspush16(Cpu *c, Uint16 s) { wspush8(c,s >> 8); wspush8(c,s & 0xff); }
Uint8 wspop8(void) { return cpu.wst.dat[--cpu.wst.ptr]; } Uint8 wspop8(Cpu *c) { return c->wst.dat[--c->wst.ptr]; }
Uint16 wspop16(void) { return wspop8() + (wspop8() << 8); } Uint16 wspop16(Cpu *c) { return wspop8(c) + (wspop8(c) << 8); }
Uint8 wspeek8(Uint8 o) { return cpu.wst.dat[cpu.wst.ptr - o]; } Uint8 wspeek8(Cpu *c, Uint8 o) { return c->wst.dat[c->wst.ptr - o]; }
Uint16 wspeek16(Uint8 o) { return bytes2short(cpu.wst.dat[cpu.wst.ptr - o], cpu.wst.dat[cpu.wst.ptr - o + 1]); } Uint16 wspeek16(Cpu *c, Uint8 o) { return bytes2short(c->wst.dat[c->wst.ptr - o], c->wst.dat[c->wst.ptr - o + 1]); }
Uint16 rspop16(void) { return cpu.rst.dat[--cpu.rst.ptr]; } Uint16 rspop16(Cpu *c) { return c->rst.dat[--c->rst.ptr]; }
void rspush16(Uint16 a) { cpu.rst.dat[cpu.rst.ptr++] = a; } void rspush16(Cpu *c, Uint16 a) { c->rst.dat[c->rst.ptr++] = a; }
/* I/O */ /* I/O */
void op_brk() { setflag(FLAG_HALT, 1); } void op_brk(Cpu *c) { setflag(c,FLAG_HALT, 1); }
void op_lit() { cpu.literal += cpu.ram.dat[cpu.ram.ptr++]; } void op_lit(Cpu *c) { c->literal += c->ram.dat[c->ram.ptr++]; }
void op_nop() { printf("NOP");} void op_nop(Cpu *c) { printf("NOP");}
void op_ldr() { wspush8(cpu.ram.dat[wspop16()]); } void op_ldr(Cpu *c) { wspush8(c,c->ram.dat[wspop16(c)]); }
void op_str() { cpu.ram.dat[wspop16()] = wspop8(); } void op_str(Cpu *c) { c->ram.dat[wspop16(c)] = wspop8(c); }
/* Logic */ /* Logic */
void op_jmp() { cpu.ram.ptr = wspop16(); } void op_jmp(Cpu *c) { c->ram.ptr = wspop16(c); }
void op_jsr() { rspush16(cpu.ram.ptr); cpu.ram.ptr = wspop16(); } void op_jsr(Cpu *c) { rspush16(c,c->ram.ptr); c->ram.ptr = wspop16(c); }
void op_rts() { cpu.ram.ptr = rspop16(); } void op_rts(Cpu *c) { c->ram.ptr = rspop16(c); }
/* Stack */ /* Stack */
void op_pop() { wspop8(); } void op_pop(Cpu *c) { wspop8(c); }
void op_dup() { wspush8(wspeek8(1)); } void op_dup(Cpu *c) { wspush8(c,wspeek8(c,1)); }
void op_swp() { Uint8 b = wspop8(), a = wspop8(); wspush8(b); wspush8(a); } void op_swp(Cpu *c) { Uint8 b = wspop8(c), a = wspop8(c); wspush8(c,b); wspush8(c,a); }
void op_ovr() { Uint8 a = wspeek8(2); wspush8(a); } void op_ovr(Cpu *c) { Uint8 a = wspeek8(c,2); wspush8(c,a); }
void op_rot() { Uint8 c = wspop8(),b = wspop8(),a = wspop8(); wspush8(b); wspush8(c); wspush8(a); } void op_rot(Cpu *c) { Uint8 c1 = wspop8(c),b = wspop8(c),a = wspop8(c); wspush8(c,b); wspush8(c,c1); wspush8(c,a); }
void op_and() { Uint8 a = wspop8(), b = wspop8(); wspush8(a & b); } void op_and(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,a & b); }
void op_ora() { Uint8 a = wspop8(), b = wspop8(); wspush8(a | b); } void op_ora(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,a | b); }
void op_rol() { Uint8 a = wspop8(), b = wspop8(); wspush8(a << b); } void op_rol(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,a << b); }
/* Arithmetic */ /* Arithmetic */
void op_add() { Uint8 a = wspop8(), b = wspop8(); wspush8(b + a); } void op_add(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b + a); }
void op_sub() { Uint8 a = wspop8(), b = wspop8(); wspush8(b - a); } void op_sub(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b - a); }
void op_mul() { Uint8 a = wspop8(), b = wspop8(); wspush8(b * a); } void op_mul(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b * a); }
void op_div() { Uint8 a = wspop8(), b = wspop8(); wspush8(b / a); } void op_div(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b / a); }
void op_equ() { Uint8 a = wspop8(), b = wspop8(); wspush8(b == a); } void op_equ(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b == a); }
void op_neq() { Uint8 a = wspop8(), b = wspop8(); wspush8(b != a); } void op_neq(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b != a); }
void op_gth() { Uint8 a = wspop8(), b = wspop8(); wspush8(b > a); } void op_gth(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b > a); }
void op_lth() { Uint8 a = wspop8(), b = wspop8(); wspush8(b < a); } void op_lth(Cpu *c) { Uint8 a = wspop8(c), b = wspop8(c); wspush8(c,b < a); }
/* Stack(16-bits) */ /* Stack(16-bits) */
void op_pop16() { wspop16(); } void op_pop16(Cpu *c) { wspop16(c); }
void op_dup16() { wspush16(wspeek16(2)); } void op_dup16(Cpu *c) { wspush16(c,wspeek16(c,2)); }
void op_swp16() { Uint16 b = wspop16(), a = wspop16(); wspush16(b); wspush16(a); } void op_swp16(Cpu *c) { Uint16 b = wspop16(c), a = wspop16(c); wspush16(c,b); wspush16(c,a); }
void op_ovr16() { Uint16 a = wspeek16(4); wspush16(a); } void op_ovr16(Cpu *c) { Uint16 a = wspeek16(c, 4); wspush16(c,a); }
void op_rot16() { Uint16 c = wspop16(), b = wspop16(), a = wspop16(); wspush16(b); wspush16(c); wspush16(a); } void op_rot16(Cpu *c) { Uint16 c1 = wspop16(c), b = wspop16(c), a = wspop16(c); wspush16(c,b); wspush16(c,c1); wspush16(c,a); }
void op_and16() { Uint16 a = wspop16(), b = wspop16(); wspush16(a & b); } void op_and16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,a & b); }
void op_ora16() { Uint16 a = wspop16(), b = wspop16(); wspush16(a | b); } void op_ora16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,a | b); }
void op_rol16() { Uint16 a = wspop16(), b = wspop16(); wspush16(a << b); } void op_rol16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,a << b); }
/* Arithmetic(16-bits) */ /* Arithmetic(16-bits) */
void op_add16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b + a); } void op_add16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b + a); }
void op_sub16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b - a); } void op_sub16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b - a); }
void op_mul16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b * a); } void op_mul16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b * a); }
void op_div16() { Uint16 a = wspop16(), b = wspop16(); wspush16(b / a); } void op_div16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush16(c,b / a); }
void op_equ16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b == a); } void op_equ16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b == a); }
void op_neq16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b != a); } void op_neq16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b != a); }
void op_gth16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b > a); } void op_gth16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b > a); }
void op_lth16() { Uint16 a = wspop16(), b = wspop16(); wspush8(b < a); } void op_lth16(Cpu *c) { Uint16 a = wspop16(c), b = wspop16(c); wspush8(c,b < a); }
void (*ops[])() = { void (*ops[])(Cpu *c) = {
op_brk, op_lit, op_nop, op_nop, op_nop, op_nop, op_ldr, op_str, op_brk, op_lit, op_nop, op_nop, op_nop, op_nop, op_ldr, op_str,
op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop, op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
op_pop, op_dup, op_swp, op_ovr, op_rot, op_and, op_ora, op_rol, op_pop, op_dup, op_swp, op_ovr, op_rot, op_and, op_ora, op_rol,
@ -146,95 +146,105 @@ Uint8 opr[][2] = {
/* clang-format on */ /* clang-format on */
int int
error(char *name, int id) error(Cpu *c, char *name, int id)
{ {
printf("Error: %s[%04x], at 0x%04x\n", name, id, cpu.counter); printf("Error: %s[%04x], at 0x%04x\n", name, id, c->counter);
return 0; return 0;
} }
int int
doliteral(Uint8 instr) doliteral(Cpu *c, Uint8 instr)
{ {
if(cpu.wst.ptr >= 255) if(c->wst.ptr >= 255)
return error("Stack overflow", instr); return error(c, "Stack overflow", instr);
wspush8(instr); wspush8(c, instr);
cpu.literal--; c->literal--;
return 1; return 1;
} }
int int
dodevices(void) /* experimental */ dodevices(Cpu *c) /* experimental */
{ {
if(cpu.ram.dat[0xfff1]) { if(c->ram.dat[0xfff1]) {
printf("%c", cpu.ram.dat[0xfff1]); printf("%c", c->ram.dat[0xfff1]);
cpu.ram.dat[0xfff1] = 0x00; c->ram.dat[0xfff1] = 0x00;
} }
return 1; return 1;
} }
int int
doopcode(Uint8 instr) doopcode(Cpu *c, Uint8 instr)
{ {
Uint8 op = instr & 0x1f; Uint8 op = instr & 0x1f;
setflag(FLAG_SHORT, (instr >> 5) & 1); setflag(c, FLAG_SHORT, (instr >> 5) & 1);
setflag(FLAG_SIGN, (instr >> 6) & 1); /* usused */ setflag(c, FLAG_SIGN, (instr >> 6) & 1); /* usused */
setflag(FLAG_COND, (instr >> 7) & 1); setflag(c, FLAG_COND, (instr >> 7) & 1);
if(getflag(FLAG_SHORT)) if(getflag(c, FLAG_SHORT))
op += 16; op += 16;
if(cpu.wst.ptr < opr[op][0]) if(c->wst.ptr < opr[op][0])
return error("Stack underflow", op); return error(c, "Stack underflow", op);
if(cpu.wst.ptr + opr[op][1] - opr[op][0] >= 255) if(c->wst.ptr + opr[op][1] - opr[op][0] >= 255)
return error("Stack overflow", instr); return error(c, "Stack overflow", instr);
if(!getflag(FLAG_COND) || (getflag(FLAG_COND) && wspop8())) if(!getflag(c, FLAG_COND) || (getflag(c, FLAG_COND) && wspop8(c)))
(*ops[op])(); (*ops[op])(c);
dodevices(); dodevices(c);
return 1; return 1;
} }
int int
eval(void) eval(Cpu *c)
{ {
Uint8 instr = cpu.ram.dat[cpu.ram.ptr++]; Uint8 instr = c->ram.dat[c->ram.ptr++];
if(cpu.literal > 0) if(c->literal > 0)
return doliteral(instr); return doliteral(c, instr);
else else
return doopcode(instr); return doopcode(c, instr);
return 1; return 1;
} }
int int
load(FILE *f) load(Cpu *c, FILE *f)
{ {
fread(cpu.ram.dat, sizeof(cpu.ram.dat), 1, f); fread(c->ram.dat, sizeof(c->ram.dat), 1, f);
return 1; return 1;
} }
void void
echof(void) echof(Cpu *c)
{ {
printf("ended @ %d steps | hf: %x sf: %x sf: %x cf: %x\n", printf("ended @ %d steps | hf: %x sf: %x sf: %x cf: %x\n",
cpu.counter, c->counter,
getflag(FLAG_HALT) != 0, getflag(c, FLAG_HALT) != 0,
getflag(FLAG_SHORT) != 0, getflag(c, FLAG_SHORT) != 0,
getflag(FLAG_SIGN) != 0, getflag(c, FLAG_SIGN) != 0,
getflag(FLAG_COND) != 0); getflag(c, FLAG_COND) != 0);
}
void
reset(Cpu *c)
{
size_t i;
char *cptr = (char *)c;
for(i = 0; i < sizeof c; i++)
cptr[i] = 0;
} }
int int
boot(void) boot(Cpu *c)
{ {
cpu.vreset = mempeek16(0xfffa); reset(c);
cpu.vframe = mempeek16(0xfffc); c->vreset = mempeek16(c, 0xfffa);
cpu.verror = mempeek16(0xfffe); c->vframe = mempeek16(c, 0xfffc);
c->verror = mempeek16(c, 0xfffe);
/* eval reset */ /* eval reset */
cpu.ram.ptr = cpu.vreset; c->ram.ptr = c->vreset;
setflag(FLAG_HALT, 0); setflag(c, FLAG_HALT, 0);
while(!(cpu.status & FLAG_HALT) && eval()) while(!(c->status & FLAG_HALT) && eval(c))
cpu.counter++; c->counter++;
/*eval frame */ /*eval frame */
cpu.ram.ptr = cpu.vframe; c->ram.ptr = c->vframe;
setflag(FLAG_HALT, 0); setflag(c, FLAG_HALT, 0);
while(!(cpu.status & FLAG_HALT) && eval()) while(!(c->status & FLAG_HALT) && eval(c))
cpu.counter++; c->counter++;
return 1; return 1;
} }

10
cpu.h
View file

@ -35,11 +35,11 @@ typedef struct {
Stack8 wst; Stack8 wst;
Stack16 rst; Stack16 rst;
Memory ram; Memory ram;
} Computer; } Cpu;
int error(char *name, int id); int error(Cpu *c, char *name, int id);
int load(FILE *f); int load(Cpu *c, FILE *f);
int boot(void); int boot(Cpu *c);
void echof(void); void echof(Cpu *c);
void echom(Memory *m, Uint8 len, char *name); void echom(Memory *m, Uint8 len, char *name);
void echos(Stack8 *s, Uint8 len, char *name); void echos(Stack8 *s, Uint8 len, char *name);

16
uxn.c
View file

@ -16,18 +16,18 @@ int
main(int argc, char *argv[]) main(int argc, char *argv[])
{ {
FILE *f; FILE *f;
Computer cpu; Cpu cpu;
if(argc < 2) if(argc < 2)
return error("No input.", 0); return error(&cpu, "No input.", 0);
if(!(f = fopen(argv[1], "rb"))) if(!(f = fopen(argv[1], "rb")))
return error("Missing input.", 0); return error(&cpu, "Missing input.", 0);
if(!load(f)) if(!load(&cpu, f))
return error("Load error", 0); return error(&cpu, "Load error", 0);
if(!boot()) if(!boot(&cpu))
return error("Boot error", 0); return error(&cpu, "Boot error", 0);
/* print result */ /* print result */
echos(&cpu.wst, 0x40, "stack"); echos(&cpu.wst, 0x40, "stack");
echom(&cpu.ram, 0x40, "ram"); echom(&cpu.ram, 0x40, "ram");
echof(); echof(&cpu);
return 0; return 0;
} }