mirror of https://git.sr.ht/~rabbits/uxn
366 lines
8.1 KiB
C
366 lines
8.1 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.
|
|
*/
|
|
|
|
#define TRIM 0x0200
|
|
|
|
typedef unsigned char Uint8;
|
|
typedef signed char Sint8;
|
|
typedef unsigned short Uint16;
|
|
|
|
typedef struct {
|
|
char name[64], items[64][64];
|
|
Uint8 len, refs;
|
|
} Macro;
|
|
|
|
typedef struct {
|
|
char name[64];
|
|
Uint8 refs;
|
|
Uint16 addr;
|
|
} Label;
|
|
|
|
typedef struct {
|
|
Uint8 data[256 * 256], llen, mlen;
|
|
Uint16 ptr, length;
|
|
Label labels[256];
|
|
Macro macros[256];
|
|
} Program;
|
|
|
|
Program p;
|
|
|
|
/* clang-format off */
|
|
|
|
char ops[][4] = {
|
|
"BRK", "LIT", "NOP", "POP", "DUP", "SWP", "OVR", "ROT",
|
|
"EQU", "NEQ", "GTH", "LTH", "GTS", "LTS", "IOR", "IOW",
|
|
"PEK", "POK", "LDR", "STR", "JMP", "JNZ", "JSR", "STH",
|
|
"ADD", "SUB", "MUL", "DIV", "AND", "ORA", "EOR", "SFT"
|
|
};
|
|
|
|
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')) 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'); 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(0x01, 0);
|
|
p.data[p.ptr++] = b;
|
|
p.length = p.ptr;
|
|
}
|
|
|
|
void
|
|
pushshort(Uint16 s, int lit)
|
|
{
|
|
if(lit) pushbyte(0x21, 0);
|
|
pushbyte((s >> 8) & 0xff, 0);
|
|
pushbyte(s & 0xff, 0);
|
|
}
|
|
|
|
void
|
|
pushtext(char *s, int lit)
|
|
{
|
|
int i = 0;
|
|
char c;
|
|
if(lit) pushbyte(0x21, 0);
|
|
while((c = s[i++])) pushbyte(c, 0);
|
|
}
|
|
|
|
Macro *
|
|
findmacro(char *name)
|
|
{
|
|
int i;
|
|
for(i = 0; i < p.mlen; ++i)
|
|
if(scmp(p.macros[i].name, name, 64))
|
|
return &p.macros[i];
|
|
return NULL;
|
|
}
|
|
|
|
Label *
|
|
findlabel(char *name)
|
|
{
|
|
int i;
|
|
for(i = 0; i < p.llen; ++i)
|
|
if(scmp(p.labels[i].name, name, 64))
|
|
return &p.labels[i];
|
|
return NULL;
|
|
}
|
|
|
|
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 */
|
|
else if(s[3 + m] == 'r')
|
|
i |= (1 << 6); /* mode: return */
|
|
else
|
|
return 0; /* failed to match */
|
|
m++;
|
|
}
|
|
return i;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
char *
|
|
sublabel(char *src, char *scope, char *name)
|
|
{
|
|
scpy(scope, src, 64);
|
|
scpy("/", src + slen(src), 64);
|
|
scpy(name, src + slen(src), 64);
|
|
return src;
|
|
}
|
|
|
|
#pragma mark - Parser
|
|
|
|
int
|
|
error(char *name, char *id)
|
|
{
|
|
printf("Error: %s[%s]\n", name, id);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
makemacro(char *name, FILE *f)
|
|
{
|
|
Macro *m;
|
|
char word[64];
|
|
if(findmacro(name))
|
|
return error("Macro duplicate", name);
|
|
if(sihx(name) && slen(name) % 2 == 0)
|
|
return error("Macro name is hex number", name);
|
|
if(findopcode(name))
|
|
return error("Macro name is invalid", name);
|
|
m = &p.macros[p.mlen++];
|
|
scpy(name, m->name, 64);
|
|
while(fscanf(f, "%s", word)) {
|
|
if(word[0] == '{') continue;
|
|
if(word[0] == '}') break;
|
|
if(m->len > 64)
|
|
return error("Macro too large", name);
|
|
if(slen(word) >= 64)
|
|
return error("Word too long", name);
|
|
scpy(word, m->items[m->len++], 64);
|
|
}
|
|
printf("New macro: %s, %d items\n", m->name, m->len);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
makelabel(char *name, Uint16 addr)
|
|
{
|
|
Label *l;
|
|
if(findlabel(name))
|
|
return error("Label duplicate", name);
|
|
if(sihx(name) && slen(name) % 2 == 0)
|
|
return error("Label name is hex number", name);
|
|
if(findopcode(name))
|
|
return error("Label name is invalid", name);
|
|
l = &p.labels[p.llen++];
|
|
l->addr = addr;
|
|
l->refs = 0;
|
|
scpy(name, l->name, 64);
|
|
printf("New label: %s, at 0x%04x\n", l->name, l->addr);
|
|
return 1;
|
|
}
|
|
|
|
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
|
|
walktoken(char *w)
|
|
{
|
|
Macro *m;
|
|
if(findopcode(w) || scmp(w, "BRK", 4))
|
|
return 1;
|
|
switch(w[0]) {
|
|
case '[': return 0;
|
|
case ']': return 0;
|
|
case '.': return 2; /* zero-page: LIT addr-lb */
|
|
case ',': return 2; /* relative: LIT addr-rel */
|
|
case ';': return 3; /* absolute: LIT addr-hb addr-lb */
|
|
case '$': return shex(w + 1);
|
|
case '#': return slen(w + 1) == 4 ? 3 : 2;
|
|
}
|
|
if((m = findmacro(w))) {
|
|
int i, res = 0;
|
|
for(i = 0; i < m->len; ++i)
|
|
res += walktoken(m->items[i]);
|
|
return res;
|
|
}
|
|
return error("Unknown label in first pass", w);
|
|
}
|
|
|
|
int
|
|
parsetoken(char *w)
|
|
{
|
|
Label *l;
|
|
Macro *m;
|
|
if(w[0] == '.' && (l = findlabel(w + 1))) { /* zero-page */
|
|
pushbyte(l->addr, 1);
|
|
return ++l->refs;
|
|
} else if(w[0] == ',' && (l = findlabel(w + 1))) {
|
|
int off = l->addr - p.ptr - 3;
|
|
if(off < -126 || off > 126)
|
|
return error("Address is too far", w);
|
|
pushbyte((Sint8)off, 1);
|
|
return ++l->refs;
|
|
} else if(w[0] == ';' && (l = findlabel(w + 1))) { /* absolute */
|
|
pushshort(l->addr, 1);
|
|
return ++l->refs;
|
|
} else if(findopcode(w) || scmp(w, "BRK", 4)) {
|
|
pushbyte(findopcode(w), 0);
|
|
return 1;
|
|
} else if(w[0] == '#') {
|
|
if(slen(w + 1) == 1)
|
|
pushbyte((Uint8)w[1], 1);
|
|
if(sihx(w + 1) && slen(w + 1) == 2)
|
|
pushbyte(shex(w + 1), 1);
|
|
else if(sihx(w + 1) && slen(w + 1) == 4)
|
|
pushshort(shex(w + 1), 1);
|
|
else
|
|
return 0;
|
|
return 1;
|
|
} else if((m = findmacro(w))) {
|
|
int i;
|
|
m->refs++;
|
|
for(i = 0; i < m->len; ++i)
|
|
if(!parsetoken(m->items[i]))
|
|
return 0;
|
|
return 1;
|
|
} else if(sihx(w)) {
|
|
if(slen(w) == 2)
|
|
pushbyte(shex(w), 0);
|
|
else if(slen(w) == 4)
|
|
pushshort(shex(w), 0);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pass1(FILE *f)
|
|
{
|
|
int ccmnt = 0;
|
|
Uint16 addr = 0;
|
|
char w[64], scope[64], subw[64];
|
|
printf("Pass 1\n");
|
|
while(fscanf(f, "%s", w) == 1) {
|
|
if(skipblock(w, &ccmnt, '(', ')')) continue;
|
|
if(w[0] == '|') {
|
|
if(shex(w + 1) < addr)
|
|
return error("Memory Overwrite", w);
|
|
addr = shex(w + 1);
|
|
} else if(w[0] == '%') {
|
|
if(!makemacro(w + 1, f))
|
|
return error("Pass1 failed", w);
|
|
} else if(w[0] == '@') {
|
|
if(!makelabel(w + 1, addr))
|
|
return error("Pass1 failed", w);
|
|
scpy(w + 1, scope, 64);
|
|
} else if(w[0] == '&') {
|
|
if(!makelabel(sublabel(subw, scope, w + 1), addr))
|
|
return error("Pass1 failed", w);
|
|
} else if(sihx(w))
|
|
addr += slen(w) / 2;
|
|
else
|
|
addr += walktoken(w);
|
|
}
|
|
rewind(f);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
pass2(FILE *f)
|
|
{
|
|
int ccmnt = 0, ctemplate = 0;
|
|
char w[64], scope[64], subw[64];
|
|
printf("Pass 2\n");
|
|
while(fscanf(f, "%s", w) == 1) {
|
|
if(w[0] == '%') continue;
|
|
if(w[0] == '&') continue;
|
|
if(w[0] == '[') continue;
|
|
if(w[0] == ']') continue;
|
|
if(skipblock(w, &ccmnt, '(', ')')) continue;
|
|
if(skipblock(w, &ctemplate, '{', '}')) continue;
|
|
if(w[0] == '|') {
|
|
p.ptr = shex(w + 1);
|
|
continue;
|
|
} else if(w[0] == '$') {
|
|
p.ptr += shex(w + 1);
|
|
continue;
|
|
} else if(w[0] == '@') {
|
|
scpy(w + 1, scope, 64);
|
|
continue;
|
|
}
|
|
if(w[1] == '&')
|
|
scpy(sublabel(subw, scope, w + 2), w + 1, 64);
|
|
if(!parsetoken(w))
|
|
return error("Unknown label in second pass", w);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
cleanup(char *filename)
|
|
{
|
|
int i;
|
|
printf("Assembled %s(%d bytes), %d labels, %d macros.\n\n", filename, (p.length - TRIM), p.llen, p.mlen);
|
|
for(i = 0; i < p.llen; ++i)
|
|
if(!p.labels[i].refs)
|
|
printf("--- Unused label: %s\n", p.labels[i].name);
|
|
for(i = 0; i < p.mlen; ++i)
|
|
if(!p.macros[i].refs)
|
|
printf("--- Unused macro: %s\n", p.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 + TRIM, p.length - TRIM, 1, fopen(argv[2], "wb"));
|
|
fclose(f);
|
|
cleanup(argv[2]);
|
|
return 0;
|
|
}
|