mirror of https://git.sr.ht/~rabbits/uxn
394 lines
9.8 KiB
C
394 lines
9.8 KiB
C
#include <stdio.h>
|
|
|
|
/*
|
|
Copyright (c) 2021 Devine Lu Linvega
|
|
|
|
Permission to use, copy, modify, and distribute this software for any
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE.
|
|
*/
|
|
|
|
typedef unsigned char Uint8;
|
|
typedef signed char Sint8;
|
|
typedef unsigned short Uint16;
|
|
typedef signed short Sint16;
|
|
|
|
typedef struct {
|
|
Uint8 data[256 * 256];
|
|
Uint16 ptr;
|
|
} Program;
|
|
|
|
typedef struct {
|
|
Uint8 len, length[16], size, refs;
|
|
char name[64], params[16][64];
|
|
} Macro;
|
|
|
|
typedef struct {
|
|
Uint8 len, offset, refs;
|
|
Uint16 addr;
|
|
char name[64];
|
|
Macro *macro;
|
|
} Label;
|
|
|
|
int macroslen;
|
|
Macro macros[256];
|
|
|
|
int labelslen;
|
|
Label labels[256];
|
|
|
|
Program p;
|
|
|
|
/* clang-format off */
|
|
|
|
char ops[][4] = {
|
|
"BRK", "NOP", "LIT", "---", "---", "---", "LDR", "STR",
|
|
"JMP", "JSR", "---", "RTS", "AND", "ORA", "ROL", "ROR",
|
|
"POP", "DUP", "SWP", "OVR", "ROT", "---", "WSR", "RSW",
|
|
"ADD", "SUB", "MUL", "DIV", "EQU", "NEQ", "GTH", "LTH"
|
|
};
|
|
|
|
int scin(char *s, char c) { int i = 0; while(s[i]) if(s[i++] == c) return i - 1; return -1; } /* string char index */
|
|
int scmp(char *a, char *b, int len) { int i = 0; while(a[i] == b[i] && i < len) if(!a[i++]) return 1; return 0; } /* string compare */
|
|
int slen(char *s) { int i = 0; while(s[i] && s[++i]) ; return i; } /* string length */
|
|
int sihx(char *s) { int i = 0; char c; while((c = s[i++])) if(!(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') && !(c >= 'A' && c <= 'F')) return 0; return 1; } /* string is hexadecimal */
|
|
int shex(char *s) { int n = 0, i = 0; char c; while((c = s[i++])) if(c >= '0' && c <= '9') n = n * 16 + (c - '0'); else if(c >= 'A' && c <= 'F') n = n * 16 + 10 + (c - 'A'); else if(c >= 'a' && c <= 'f') n = n * 16 + 10 + (c - 'a'); return n; } /* string to num */
|
|
char *scpy(char *src, char *dst, int len) { int i = 0; while((dst[i] = src[i]) && i < len - 2) i++; dst[i + 1] = '\0'; return dst; } /* string copy */
|
|
|
|
#pragma mark - Helpers
|
|
|
|
/* clang-format on */
|
|
|
|
#pragma mark - I/O
|
|
|
|
void
|
|
pushbyte(Uint8 b, int lit)
|
|
{
|
|
if(lit)
|
|
pushbyte(0x02, 0);
|
|
p.data[p.ptr++] = b;
|
|
}
|
|
|
|
void
|
|
pushshort(Uint16 s, int lit)
|
|
{
|
|
if(lit)
|
|
pushbyte(0x22, 0);
|
|
pushbyte((s >> 8) & 0xff, 0);
|
|
pushbyte(s & 0xff, 0);
|
|
}
|
|
|
|
void
|
|
pushtext(char *s, int lit)
|
|
{
|
|
int i = 0;
|
|
char c;
|
|
if(lit)
|
|
pushbyte(0x22, 0);
|
|
while((c = s[i++]))
|
|
pushbyte(c, 0);
|
|
pushbyte(' ', 0);
|
|
}
|
|
|
|
Macro *
|
|
findmacro(char *s)
|
|
{
|
|
int i;
|
|
for(i = 0; i < macroslen; ++i)
|
|
if(scmp(macros[i].name, s, 64))
|
|
return ¯os[i];
|
|
return NULL;
|
|
}
|
|
|
|
Label *
|
|
findlabel(char *s)
|
|
{
|
|
int i, rng = scin(s, '.');
|
|
char name[64];
|
|
scpy(s, name, rng > 0 ? rng + 1 : 64);
|
|
for(i = 0; i < labelslen; ++i)
|
|
if(scmp(labels[i].name, name, 64))
|
|
return &labels[i];
|
|
return NULL;
|
|
}
|
|
|
|
Uint16
|
|
findlabeladdr(char *s)
|
|
{
|
|
int i, o = 0;
|
|
char *param;
|
|
Label *l = findlabel(s);
|
|
if(scin(s, '.') < 1)
|
|
return l->addr;
|
|
param = s + scin(s, '.') + 1;
|
|
for(i = 0; i < l->macro->len; ++i) {
|
|
if(scmp(l->macro->params[i], param, 64))
|
|
return l->addr + o;
|
|
o += l->macro->length[i];
|
|
}
|
|
printf("Warning %s.%s[%s]\n", l->name, param, l->macro->name);
|
|
return 0;
|
|
}
|
|
|
|
Uint8
|
|
findlabellen(char *s)
|
|
{
|
|
int i;
|
|
char *param;
|
|
Label *l = findlabel(s);
|
|
if(scin(s, '.') < 1)
|
|
return l->len;
|
|
param = s + scin(s, '.') + 1;
|
|
for(i = 0; i < l->macro->len; ++i)
|
|
if(scmp(l->macro->params[i], param, 64))
|
|
return l->macro->length[i];
|
|
printf("Warning %s.%s[%s]\n", l->name, param, l->macro->name);
|
|
return 0;
|
|
}
|
|
|
|
Uint8
|
|
findopcode(char *s)
|
|
{
|
|
int i;
|
|
for(i = 0; i < 0x20; ++i) {
|
|
int m = 0;
|
|
char *o = ops[i];
|
|
if(o[0] != s[0] || o[1] != s[1] || o[2] != s[2])
|
|
continue;
|
|
while(s[3 + m]) {
|
|
if(s[3 + m] == '2') i |= (1 << 5); /* mode: short */
|
|
if(s[3 + m] == 'S') i |= (1 << 6); /* mode: signed */
|
|
if(s[3 + m] == '?') i |= (1 << 7); /* mode: conditional */
|
|
m++;
|
|
}
|
|
return i;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#pragma mark - Parser
|
|
|
|
int
|
|
error(char *name, char *id)
|
|
{
|
|
printf("Error: %s[%s]\n", name, id);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
makemacro(char *name, FILE *f)
|
|
{
|
|
Uint8 mode = 0;
|
|
Macro *m;
|
|
char wv[64];
|
|
if(findmacro(name))
|
|
return error("Macro duplicate", name);
|
|
if(sihx(name))
|
|
return error("Macro name is hex number", name);
|
|
if(findopcode(name))
|
|
return error("Macro name is invalid", name);
|
|
m = ¯os[macroslen++];
|
|
scpy(name, m->name, 64);
|
|
while(fscanf(f, "%s", wv)) {
|
|
if(wv[0] == '{')
|
|
continue;
|
|
if(wv[0] == '}')
|
|
break;
|
|
if(mode == 0)
|
|
scpy(wv, m->params[m->len], 64);
|
|
else {
|
|
m->length[m->len] = shex(wv);
|
|
m->size += m->length[m->len];
|
|
m->len++;
|
|
}
|
|
mode = !mode;
|
|
}
|
|
printf("New macro: %s[%d:%d]\n", name, m->len, m->size);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
makelabel(char *name, Uint16 addr, Uint8 len, Macro *m)
|
|
{
|
|
Label *l;
|
|
if(findlabel(name))
|
|
return error("Label duplicate", name);
|
|
if(sihx(name))
|
|
return error("Label name is hex number", name);
|
|
if(findopcode(name))
|
|
return error("Label name is invalid", name);
|
|
l = &labels[labelslen++];
|
|
l->addr = addr;
|
|
l->len = len;
|
|
l->refs = 0;
|
|
scpy(name, l->name, 64);
|
|
if(m)
|
|
l->macro = m;
|
|
printf("New label: %s, at 0x%02x[%d]\n", l->name, l->addr, l->len);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
makeconst(char *id, FILE *f)
|
|
{
|
|
char wv[64];
|
|
fscanf(f, "%s", wv);
|
|
return makelabel(id, shex(wv), 1, 0);
|
|
}
|
|
|
|
int
|
|
makevariable(char *id, Uint16 *addr, FILE *f)
|
|
{
|
|
char wv[64];
|
|
Uint16 origin;
|
|
Uint8 len;
|
|
Macro *m = NULL;
|
|
fscanf(f, "%s", wv);
|
|
origin = *addr;
|
|
if((m = findmacro(wv))) {
|
|
len = m->size;
|
|
m->refs++;
|
|
} else
|
|
len = shex(wv);
|
|
*addr += len;
|
|
return makelabel(id, origin, len, m);
|
|
}
|
|
|
|
int
|
|
skipblock(char *w, int *cap, char a, char b)
|
|
{
|
|
if(w[0] == b) {
|
|
*cap = 0;
|
|
return 1;
|
|
}
|
|
if(w[0] == a) *cap = 1;
|
|
if(*cap) return 1;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pass1(FILE *f)
|
|
{
|
|
int ccmnt = 0, cbits = 0;
|
|
Uint16 addr = 0;
|
|
char w[64];
|
|
printf("Pass 1\n");
|
|
while(fscanf(f, "%s", w) == 1) {
|
|
if(skipblock(w, &ccmnt, '(', ')')) continue;
|
|
if(skipblock(w, &cbits, '[', ']')) {
|
|
if(w[0] == '[' || w[0] == ']')
|
|
continue;
|
|
if(sihx(w))
|
|
addr += slen(w) == 4 ? 2 : 1;
|
|
else
|
|
addr += slen(w) + 1;
|
|
} else if(w[0] == '@') {
|
|
if(!makelabel(w + 1, addr, 0, NULL))
|
|
return error("Pass1 failed", w);
|
|
} else if(w[0] == ';') {
|
|
if(!makevariable(w + 1, &addr, f))
|
|
return error("Pass1 failed", w);
|
|
} else if(w[0] == '&') {
|
|
if(!makemacro(w + 1, f))
|
|
return error("Pass1 failed", w);
|
|
} else if(w[0] == ':') {
|
|
if(!makeconst(w + 1, f))
|
|
return error("Pass1 failed", w);
|
|
} else if(findopcode(w) || scmp(w, "BRK", 4))
|
|
addr += 1;
|
|
else {
|
|
switch(w[0]) {
|
|
case '|':
|
|
if(shex(w + 1) < addr)
|
|
return error("Memory Overlap", w);
|
|
addr = shex(w + 1);
|
|
break;
|
|
case '=': addr += 4; break; /* STR helper (lit addr-hb addr-lb str) */
|
|
case '~': addr += 4; break; /* LDR helper (lit addr-hb addr-lb ldr) */
|
|
case ',': addr += 3; break;
|
|
case '.': addr += (slen(w + 1) == 2 ? 1 : 2); break;
|
|
case '+': /* signed positive */
|
|
case '-': /* signed negative */
|
|
case '#': addr += (slen(w + 1) == 2 ? 2 : 3); break;
|
|
default: return error("Unknown label in first pass", w);
|
|
}
|
|
}
|
|
}
|
|
rewind(f);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
pass2(FILE *f)
|
|
{
|
|
int ccmnt = 0, cbits = 0, cmacro = 0;
|
|
char w[64];
|
|
printf("Pass 2\n");
|
|
while(fscanf(f, "%s", w) == 1) {
|
|
Uint8 op = 0;
|
|
Label *l;
|
|
if(w[0] == '@') continue;
|
|
if(w[0] == '&') continue;
|
|
if(skipblock(w, &ccmnt, '(', ')')) continue;
|
|
if(skipblock(w, &cmacro, '{', '}')) continue;
|
|
/* clang-format off */
|
|
if(skipblock(w, &cbits, '[', ']')) {
|
|
if(w[0] == '[' || w[0] == ']') { continue; }
|
|
if(slen(w) == 4 && sihx(w)) pushshort(shex(w), 0);
|
|
else if(slen(w) == 2 && sihx(w)) pushbyte(shex(w), 0);
|
|
else pushtext(w, 0);
|
|
}
|
|
else if(w[0] == '|') p.ptr = shex(w + 1);
|
|
else if((op = findopcode(w)) || scmp(w, "BRK", 4)) pushbyte(op, 0);
|
|
else if(w[0] == ':') fscanf(f, "%s", w);
|
|
else if(w[0] == ';') fscanf(f, "%s", w);
|
|
else if(w[0] == '.' && sihx(w + 1) && slen(w + 1) == 2) pushbyte(shex(w + 1), 0);
|
|
else if(w[0] == '.' && sihx(w + 1) && slen(w + 1) == 4) pushshort(shex(w + 1), 0);
|
|
else if(w[0] == '#' && sihx(w + 1) && slen(w + 1) == 2) pushbyte(shex(w + 1), 1);
|
|
else if(w[0] == '#' && sihx(w + 1) && slen(w + 1) == 4) pushshort(shex(w + 1), 1);
|
|
else if(w[0] == '+' && sihx(w + 1) && slen(w + 1) == 2) pushbyte((Sint8)shex(w + 1), 1);
|
|
else if(w[0] == '+' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)shex(w + 1), 1);
|
|
else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 2) pushbyte((Sint8)(shex(w + 1) * -1), 1);
|
|
else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)(shex(w + 1) * -1), 1);
|
|
else if(w[0] == '=' && (l = findlabel(w + 1)) && l->len){ pushshort(findlabeladdr(w+1), 1); pushbyte(findopcode(findlabellen(w+1) == 2 ? "STR2" : "STR"), 0); l->refs++;}
|
|
else if(w[0] == '~' && (l = findlabel(w + 1)) && l->len){ pushshort(findlabeladdr(w+1), 1); pushbyte(findopcode(findlabellen(w+1) == 2 ? "LDR2" : "LDR"), 0); l->refs++;}
|
|
else if(w[0] == '=' && sihx(w + 1)) { pushshort(shex(w + 1), 1); pushbyte(findopcode("STR2"), 0); }
|
|
else if(w[0] == '~' && sihx(w + 1)) { pushshort(shex(w + 1), 1); pushbyte(findopcode("LDR2"), 0); }
|
|
else if((l = findlabel(w + 1))) { pushshort(findlabeladdr(w+1), w[0] == ','); l->refs++; }
|
|
else return error("Unknown label in second pass", w);
|
|
/* clang-format on */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
cleanup(void)
|
|
{
|
|
int i;
|
|
for(i = 0; i < labelslen; ++i)
|
|
if(!labels[i].refs)
|
|
printf("--- Unused label: %s\n", labels[i].name);
|
|
for(i = 0; i < macroslen; ++i)
|
|
if(!macros[i].refs)
|
|
printf("--- Unused macro: %s\n", macros[i].name);
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
FILE *f;
|
|
if(argc < 3)
|
|
return error("Input", "Missing");
|
|
if(!(f = fopen(argv[1], "r")))
|
|
return error("Open", "Failed");
|
|
if(!pass1(f) || !pass2(f))
|
|
return error("Assembly", "Failed");
|
|
fwrite(p.data, sizeof(p.data), 1, fopen(argv[2], "wb"));
|
|
fclose(f);
|
|
printf("Assembled %s.\n\n", argv[2]);
|
|
cleanup();
|
|
return 0;
|
|
}
|