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p24.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <termios.h>
uint8_t limit = 15;
uint16_t clock = 0;
uint16_t range = 0x1fff;
uint32_t t = 0, /* 25 bit */
r = 0, /* 25 bit */
a = 0, /* 25 bit */
ds[15] = {0}, /* 25 bits wide */
rs[15] = {0}, /* 25 bits wide */
p = 0, /* 24 bit */
i = 0, /* 24 bit */
* mem; /* 24 bits wide */
uint8_t sp = 0, /* 8 bits */
rp = 0, /* 8 bits */
slot[4] = {0}; /* instruction cache 8 bits */
uint32_t _t = 0, /* 25 bit */
_r = 0, /* 25 bit */
_a = 0, /* 25 bit */
_p = 0, /* 24 bit */
_i = 0; /* 24 bit */
uint8_t _sp = 0, /* 8 bits */
_rp = 0, /* 8 bits */
_slot[4] = {0}; /* 8 bits */
static char getch(void) { /* reads from keypress, doesn't echo */
struct termios oldattr, newattr;
char ch;
tcgetattr( STDIN_FILENO, &oldattr );
newattr = oldattr;
newattr.c_iflag &= ~( ICRNL );
newattr.c_lflag &= ~( ICANON | ECHO );
tcsetattr( STDIN_FILENO, TCSANOW, &newattr );
ch = getchar();
tcsetattr( STDIN_FILENO, TCSANOW, &oldattr );
// printf("%d\n", ch);
if(ch==0x1b) exit(0);
return ch==127 ? 8 : ch;
}
static int putch(char c) { /* output character to sstdout & flush */
int res=putchar(c);
fflush(stdout);
return res;
}
static void Cycle(void) {
i = _i; t =_t; r = _r; p = _p; a = _a; rp = _rp; sp = _sp;
slot[3] = _slot[3];
slot[2] = _slot[2];
slot[1] = _slot[1];
slot[0] = _slot[0];
clock++;
}
static void next(void) { clock |= 7; }
static void rpush(uint32_t v) { _rp = (limit&(rp+1)); rs[_rp] = r; _r = v; }
static uint32_t rpop(void) { _rp = (limit&(rp-1)); _r = rs[rp]; return r; }
static void spush(uint32_t v) { _sp = (limit&(sp+1)); ds[_sp] = t; _t = v; }
static uint32_t spopp(void) { _sp = (limit&(sp-1)); _t = ds[sp]; return t; }
static void _continue() {
_i = mem[p];
_slot[3] = (_i%64);
_slot[2] = ((_i/64)%64);
_slot[1] = (((_i/64)/64)%64);
_slot[0] = (63&(((_i/64)/64)/64));
_p = (range&(p+1));
}
static void jmp (){ _p=(range&i); next(); };
static void call (){ rpush(p); jmp(); };
static void ret (){ _p=(range&rpop()); next(); };
static void jz (){ (spopp()&0xffffff) ? next() : jmp(); };
static void jnc (){ (t&0x1000000) ? next() : jmp(); };
static void ld (){ spush(mem[(range&a)]); };
static void ldp (){ ld(); _a=a+1; };
static void ldi (){ _p=(range&(p+1)); spush(mem[(range&p)]); };
static void st (){ mem[(range&a)]=spopp(); };
static void stp (){ st(); _a=a+1; };
static void com (){ _t=((t&0xffffff)^0xffffff); };
static void shr (){ _t=((t>>1)&0xffffff); };
static void shl (){ _t=((t<<1)&0x1ffffff); };
static void mult (){
int y = (a&1) ? ((ds[sp]+t)&0x1ffffff) : t;
_t = (y>>1);
_a = (y&1) ? (((a&0xffffff)>>1)|0x800000) : ((a&0xffffff)>>1);
};
static void andd (){ _t=((spopp()&_t)&0xffffff); };
static void xorr (){ _t=((spopp()^_t)&0xffffff); };
static void ddiv (){
int y = 0, x = (((ds[sp]&0xffffff)+(t&0xffffff)));
if ((x&0x1000000)) {
y = ((x&0xffffff)<<1);
_a = (((a<<1)&0xffffff)+1);
} else {
y = ((t&0xffffff)<<1);
_a = (((a<<1)&0xffffff));
}
_t = (a&0x800000) ? y+1 : y;
};
static void add (){ _t=((spopp()&0xffffff)+(_t&0xffffff)); };
static void popr (){ spush(rpop()); };
static void pushs (){ spush(t); };
static void lda (){ spush(a); };
static void pushr (){ rpush(spopp()); };
static void sta (){ _a=spopp(); };
static void pops (){ spopp(); };
static void nop (){ next(); };
static void get (){ char c = getch(); spush(c); ret(); };
static void put (){ char c = spopp(); putch((c&0x7f)); ret(); };
static void execute(uint8_t code)
{
switch(code) {
case 0x00: jmp(); break;
case 0x01: ret(); break;
case 0x02: jz(); break;
case 0x03: jnc(); break;
case 0x04: call(); break;
case 0x06: get(); break;
case 0x07: put(); break;
case 0x09: ldp(); break;
case 0x0a: ldi(); break;
case 0x0b: ld(); break;
case 0x0d: stp(); break;
case 0x0f: st(); break;
case 0x10: com(); break;
case 0x11: shl(); break;
case 0x12: shr(); break;
case 0x13: mult(); break;
case 0x14: xorr(); break;
case 0x15: andd(); break;
case 0x16: ddiv(); break;
case 0x17: add(); break;
case 0x18: popr(); break;
case 0x19: lda(); break;
case 0x1a: pushs(); break;
case 0x1c: pushr(); break;
case 0x1d: sta(); break;
case 0x1e: nop(); break;
case 0x1f: pops(); break;
}
}
static void sstack()
{
printf(" s:%0x ", t);
int x = 0;
for(x = sp; x > 0 ; x--)
printf("%0x ", ds[x]);
printf("\n");
}
static void rstack()
{
printf(" r:%0x ", r);
int x;
for(x = rp; x > 0; x--)
printf("%0x ", rs[x]);
printf("\n");
}
static void registers()
{
printf(" p=%0x i=%0x i1=%0x i2=%0x i3=%0x i4=%0x sp=%0x rp=%0x \n a=%0x\n",
p, i, slot[0], slot[1], slot[2], slot[3], sp, rp, a);
}
static void S() { printf("\n clock=%0x", clock); registers(); sstack(); rstack(); }
static void Sync()
{
switch(clock&7) {
case 0: _continue(); break;
case 1: execute(slot[0]); break;
case 2: execute(slot[1]); break;
case 3: execute(slot[2]); break;
case 4: execute(slot[3]);
default: next(); break;
}
}
static void c() { Sync(); Cycle(); S(); }
int main()
{
uint32_t memory[0x8000];
FILE *f = fopen("p24.bin", "rb");
fread(memory, 8192, sizeof(memory[0]), f);
mem = memory;
while(1) { Sync(); Cycle(); }
}