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Hello world with strlen

This commit is contained in:
neauoire 2021-02-06 10:39:13 -08:00
parent 60cbe91cde
commit 5d2025d7e8
5 changed files with 127 additions and 48 deletions
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4
README.md
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@ -27,6 +27,10 @@ cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn
- `|0010`, move to position in the program
- `"hello`, push literal bytes for word "hello"
### Operator modes
- `,1234 ,0001 ADD^`, 16-bits operators have the short flag `^`.
```
( hello world )

15
examples/core.usm
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@ -6,14 +6,19 @@
|0100 @RESET
"hello
@word1 "hello_word ( len: 0x0b )
@loop
,dev1w STR
,incr JSU ( call incr )
,05 NEQ ,loop ROT JSC
,dev1w STR ( write to stdout )
,incr JSU ( increment itr )
,word1 ,strlen JSU ( get strlen )
NEQ ,loop ROT JSC ( loop != strlen )
BRK ( RESET )
BRK
@strlen
,0001 ADD^ PEK
RTS
@incr
,iterator LDR

32
examples/hello.usm Normal file
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@ -0,0 +1,32 @@
( hello world )
;iterator
:dev1r FFF0
:dev1w FFF1
|0100 @RESET
@word1 "hello_word ( len: 0x0b )
@loop
,dev1w STR ( write to stdout )
,incr JSU ( increment itr )
,word1 ,strlen JSU ( get strlen )
NEQ ,loop ROT JSC ( loop != strlen )
BRK
@strlen
,0001 ADD^ PEK
RTS
@incr
,iterator LDR
,01 ADD
,iterator STR
,iterator LDR
RTS
|c000 @FRAME BRK
|d000 @ERROR BRK
|FFFA .RESET .FRAME .ERROR

73
uxn.c
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@ -12,7 +12,7 @@ WITH REGARD TO THIS SOFTWARE.
*/
#define FLAG_HALT 0x01
#define FLAG_ZERO 0x02
#define FLAG_SHORT 0x02
#define FLAG_CARRY 0x04
#define FLAG_TRAPS 0x08
@ -96,6 +96,7 @@ Uint8 rampeek8(Uint16 s) { return cpu.ram.dat[s] & 0xff; }
Uint8 mempeek8(Uint16 s) { return cpu.rom.dat[s]; }
Uint16 mempeek16(Uint16 s) { return (cpu.rom.dat[s] << 8) + (cpu.rom.dat[s+1] & 0xff); }
void wspush8(Uint8 b) { cpu.wst.dat[cpu.wst.ptr++] = b; }
void wspush16(Uint16 s) { wspush8(s >> 8); wspush8(s & 0xff); }
Uint8 wspop8(void) { return cpu.wst.dat[--cpu.wst.ptr]; }
Uint16 wspop16(void) { return wspop8() + (wspop8() << 8); }
Uint8 wspeek8(void) { return cpu.wst.dat[cpu.wst.ptr - 1]; }
@ -122,18 +123,25 @@ void op_and() { wspush8(wspop8() & wspop8()); }
void op_ora() { wspush8(wspop8() | wspop8()); }
void op_rol() { wspush8(wspop8() << 1); }
void op_ror() { wspush8(wspop8() >> 1); }
void op_add() { wspush8(wspop8() + wspop8()); }
void op_add() {
if(getflag(FLAG_SHORT))
wspush16(wspop16() + wspop16());
else
wspush8(wspop8() + wspop8());
}
void op_sub() { wspush8(wspop8() - wspop8()); }
void op_mul() { wspush8(wspop8() * wspop8()); }
void op_div() { wspush8(wspop8() / wspop8()); }
void op_ldr() { wspush8(cpu.ram.dat[wspop16()]); }
void op_str() { cpu.ram.dat[wspop16()] = wspop8(); }
void op_pek() { wspush8(cpu.rom.dat[wspop16()]); }
void op_pok() { printf("TODO:\n");}
void (*ops[])(void) = {
void (*ops[])() = {
op_brk, op_rts, op_lit, op_drp, op_dup, op_swp, op_ovr, op_rot,
op_jmu, op_jsu, op_jmc, op_jsc, op_equ, op_neq, op_gth, op_lth,
op_and, op_ora, op_rol, op_ror, op_add, op_sub, op_mul, op_div,
op_ldr, op_str, op_brk, op_brk, op_brk, op_brk, op_brk, op_brk
op_ldr, op_str, op_pek, op_pok, op_brk, op_brk, op_brk, op_brk
};
Uint8 opr[][2] = {
@ -162,9 +170,9 @@ reset(void)
}
int
error(char *name)
error(char *name, int id)
{
printf("Error: %s, at 0x%04x\n", name, cpu.counter);
printf("Error: %s[%04x], at 0x%04x\n", name, id, cpu.counter);
return 0;
}
@ -177,31 +185,48 @@ device1(Uint8 *read, Uint8 *write)
return 0;
}
void
opc(Uint8 src, Uint8 *op, Uint8 *mode)
{
*op = src;
*op &= ~(1 << 5);
*op &= ~(1 << 6);
*op &= ~(1 << 7);
*mode = src;
*mode &= ~(1 << 0);
*mode &= ~(1 << 1);
*mode &= ~(1 << 2);
*mode &= ~(1 << 3);
}
int
eval(void)
{
Uint8 instr = cpu.rom.dat[cpu.rom.ptr++];
Uint8 op, opmode;
/* when literal */
if(cpu.literal > 0) {
wspush8(instr);
cpu.literal--;
return 1;
}
if(instr < 32) {
if(cpu.wst.ptr < opr[instr][0])
return error("Stack underflow");
/* TODO stack overflow */
(*ops[instr])();
}
if(instr > 0x10)
setflag(FLAG_ZERO, 0);
if(cpu.counter == 128) {
return error("Reached bounds");
}
/* when opcode */
opc(instr, &op, &opmode);
setflag(FLAG_SHORT, (instr >> 5) & 1);
if((instr >> 6) & 1)
printf("Unused flag: %02x\n", instr);
if((instr >> 7) & 1)
printf("Unused flag: %02x\n", instr);
/* TODO: setflag(FLAG_B, (instr >> 6) & 1); */
/* TODO: setflag(FLAG_C, (instr >> 7) & 1); */
if(cpu.wst.ptr < opr[op][0])
return error("Stack underflow", op);
(*ops[op])();
cpu.counter++;
return 1;
}
void
int
start(FILE *f)
{
reset();
@ -216,6 +241,8 @@ start(FILE *f)
/* experimental */
if(cpu.ram.dat[0xfff1])
device1(&cpu.ram.dat[0xfff0], &cpu.ram.dat[0xfff1]);
if(cpu.counter > 256)
return error("Reached bounds", cpu.counter);
}
/*eval frame */
printf("\nPhase: frame\n");
@ -227,10 +254,11 @@ start(FILE *f)
printf("ended @ %d steps | ", cpu.counter);
printf("hf: %x zf: %x cf: %x tf: %x\n",
getflag(FLAG_HALT) != 0,
getflag(FLAG_ZERO) != 0,
getflag(FLAG_SHORT) != 0,
getflag(FLAG_CARRY) != 0,
getflag(FLAG_TRAPS) != 0);
printf("\n");
return 1;
}
int
@ -238,10 +266,11 @@ main(int argc, char *argv[])
{
FILE *f;
if(argc < 2)
return error("No input.");
return error("No input.", 0);
if(!(f = fopen(argv[1], "rb")))
return error("Missing input.");
start(f);
return error("Missing input.", 0);
if(!start(f))
return error("Program error", 0);
/* print result */
echos(&cpu.wst, 0x40, "stack");
echom(&cpu.ram, 0x40, "ram");

41
uxnasm.c
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@ -29,11 +29,11 @@ Label labels[256];
/* clang-format off */
char opcodes[][4] = {
char ops[][4] = {
"BRK", "RTS", "LIT", "POP", "DUP", "SWP", "OVR", "ROT",
"JMU", "JSU", "JMC", "JSC", "EQU", "NEQ", "GTH", "LTH",
"AND", "ORA", "ROL", "ROR", "ADD", "SUB", "MUL", "DIV",
"LDR", "STR", "---", "---", "---", "---", "---", "---"
"LDR", "STR", "PEK", "POK", "---", "---", "---", "---"
};
/* clang-format on */
@ -162,6 +162,27 @@ findlabel(char *s)
return NULL;
}
Uint8
findop(char *s)
{
int i;
for(i = 0; i < 32; ++i) {
int m = 0;
if(ops[i][0] != s[0]) continue;
if(ops[i][1] != s[1]) continue;
if(ops[i][2] != s[2]) continue;
while(s[3 + m]) {
char c = s[3 + m];
if(c == '^') i |= (1 << 5); /* mode: 16 bits */
if(c == '&') i |= (1 << 6); /* mode: unused */
if(c == '~') i |= (1 << 7); /* mode: unused */
m++;
}
return i;
}
return 0;
}
#pragma mark - Parser
int
@ -171,16 +192,6 @@ error(char *name, char *id)
return 0;
}
Uint8
findop(char *s)
{
int i;
for(i = 0; i < 32; ++i)
if(scmp(opcodes[i], s))
return i;
return 0;
}
int
makelabel(char *id, Uint16 addr)
{
@ -210,7 +221,6 @@ pass1(FILE *f)
char w[64];
while(fscanf(f, "%s", w) == 1) {
if(iscomment(w, &skip)) continue;
suca(w);
if(w[0] == '@' && !makelabel(w + 1, addr))
return error("Pass1 failed", w);
if(w[0] == ';' && !makelabel(w + 1, vars++))
@ -253,7 +263,6 @@ pass2(FILE *f)
Label *l;
if(w[0] == '@') continue;
if(w[0] == ';') continue;
suca(w);
if(iscomment(w, &skip)) continue;
if(w[0] == '|')
p.ptr = shex(w + 1);
@ -261,10 +270,10 @@ pass2(FILE *f)
fscanf(f, "%s", w);
else if(w[0] == '"')
pushword(w + 1);
else if((op = findop(w)) || scmp(w, "BRK"))
pushbyte(op, 0);
else if((l = findlabel(w + 1)))
pushshort(l->addr, w[0] == ',');
else if((op = findop(w)) || scmp(w, "BRK"))
pushbyte(op, 0);
else if(sihx(w + 1) && slen(w + 1) == 2)
pushbyte(shex(w + 1), w[0] == ',');
else if(sihx(w + 1) && slen(w + 1) == 4)