mirror of https://git.sr.ht/~rabbits/uxn
518 lines
13 KiB
C
518 lines
13 KiB
C
#include <stdio.h>
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/*
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Copyright (c) 2021-2023 Devine Lu Linvega, Andrew Alderwick
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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#define TRIM 0x0100
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#define LENGTH 0x10000
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typedef unsigned char Uint8;
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typedef signed char Sint8;
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typedef unsigned short Uint16;
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typedef struct {
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char name[0x40], items[0x40][0x40];
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Uint8 len;
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} Macro;
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typedef struct {
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char name[0x40];
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Uint16 addr, refs;
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} Label;
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typedef struct {
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char name[0x40], rune;
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Uint16 addr;
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} Reference;
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typedef struct {
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Uint8 data[LENGTH];
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Uint8 lambda_stack[0x100], lambda_ptr, lambda_count;
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char scope[0x40], lambda[0x10];
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unsigned int ptr, length;
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Uint16 label_len, macro_len, refs_len;
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Label labels[0x400];
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Macro macros[0x100];
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Reference refs[0x800];
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} Program;
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Program p;
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/* clang-format off */
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static char ops[][4] = {
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"LIT", "INC", "POP", "NIP", "SWP", "ROT", "DUP", "OVR",
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"EQU", "NEQ", "GTH", "LTH", "JMP", "JCN", "JSR", "STH",
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"LDZ", "STZ", "LDR", "STR", "LDA", "STA", "DEI", "DEO",
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"ADD", "SUB", "MUL", "DIV", "AND", "ORA", "EOR", "SFT"
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};
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static int scmp(char *a, char *b, int len) { int i = 0; while(a[i] == b[i]) if(!a[i] || ++i >= len) return 1; return 0; } /* string compare */
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static 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 i > 1; } /* string is hexadecimal */
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static 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 */
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static int slen(char *s) { int i = 0; while(s[i]) i++; return i; } /* string length */
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static int spos(char *s, char c) { Uint8 i = 0, j; while((j = s[i++])) if(j == c) return i; return -1; } /* character position */
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static 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 */
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static char *scat(char *dst, const char *src) { char *ptr = dst + slen(dst); while(*src) *ptr++ = *src++; *ptr = '\0'; return dst; } /* string cat */
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/* clang-format on */
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static int parse(char *w, FILE *f);
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static int
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error(const char *name, const char *msg)
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{
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fprintf(stderr, "%s: %s\n", name, msg);
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return 0;
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}
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static char *
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sublabel(char *src, char *scope, char *name)
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{
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if(slen(scope) + slen(name) >= 0x3f) {
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error("Sublabel length too long", name);
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return NULL;
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}
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return scat(scat(scpy(scope, src, 0x40), "/"), name);
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}
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static Macro *
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findmacro(char *name)
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{
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int i;
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for(i = 0; i < p.macro_len; i++)
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if(scmp(p.macros[i].name, name, 0x40))
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return &p.macros[i];
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return NULL;
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}
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static Label *
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findlabel(char *name)
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{
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int i;
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for(i = 0; i < p.label_len; i++)
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if(scmp(p.labels[i].name, name, 0x40))
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return &p.labels[i];
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return NULL;
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}
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static Uint8
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findopcode(char *s)
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{
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int i;
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for(i = 0; i < 0x20; i++) {
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int m = 0;
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if(!scmp(ops[i], s, 3))
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continue;
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if(!i) i |= (1 << 7); /* force keep for LIT */
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while(s[3 + m]) {
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if(s[3 + m] == '2')
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i |= (1 << 5); /* mode: short */
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else if(s[3 + m] == 'r')
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i |= (1 << 6); /* mode: return */
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else if(s[3 + m] == 'k')
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i |= (1 << 7); /* mode: keep */
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else
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return 0; /* failed to match */
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m++;
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}
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return i;
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}
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return 0;
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}
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static int
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makemacro(char *name, FILE *f)
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{
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Macro *m;
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char word[0x40];
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if(findmacro(name))
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return error("Macro duplicate", name);
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if(sihx(name) && slen(name) % 2 == 0)
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return error("Macro name is hex number", name);
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if(findopcode(name) || scmp(name, "BRK", 4) || !slen(name))
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return error("Macro name is invalid", name);
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if(p.macro_len == 0x100)
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return error("Macros limit exceeded", name);
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m = &p.macros[p.macro_len++];
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scpy(name, m->name, 0x40);
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while(fscanf(f, "%63s", word) == 1) {
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if(word[0] == '{') continue;
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if(word[0] == '}') break;
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if(word[0] == '%')
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return error("Macro error", name);
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if(m->len >= 0x40)
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return error("Macro size exceeded", name);
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scpy(word, m->items[m->len++], 0x40);
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}
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return 1;
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}
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static int
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makelabel(char *name)
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{
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Label *l;
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if(findlabel(name))
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return error("Label duplicate", name);
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if(sihx(name) && (slen(name) == 2 || slen(name) == 4))
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return error("Label name is hex number", name);
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if(findopcode(name) || scmp(name, "BRK", 4) || !slen(name))
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return error("Label name is invalid", name);
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if(p.label_len == 0x400)
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return error("Labels limit exceeded", name);
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l = &p.labels[p.label_len++];
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l->addr = p.ptr;
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l->refs = 0;
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scpy(name, l->name, 0x40);
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return 1;
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}
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static char *
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makelambda(int id)
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{
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scpy("lambda", p.lambda, 0x07);
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p.lambda[6] = '0' + (id >> 0x4);
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p.lambda[7] = '0' + (id & 0xf);
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return p.lambda;
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}
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static int
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makereference(char *scope, char *label, char rune, Uint16 addr)
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{
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char subw[0x40], parent[0x40];
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Reference *r;
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if(p.refs_len >= 0x800)
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return error("References limit exceeded", label);
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r = &p.refs[p.refs_len++];
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if(label[0] == '{') {
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p.lambda_stack[p.lambda_ptr++] = p.lambda_count;
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scpy(makelambda(p.lambda_count++), r->name, 0x40);
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} else if(label[0] == '&') {
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if(!sublabel(subw, scope, label + 1))
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return error("Invalid sublabel", label);
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scpy(subw, r->name, 0x40);
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} else {
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int pos = spos(label, '/');
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if(pos > 0) {
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Label *l;
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if((l = findlabel(scpy(label, parent, pos))))
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l->refs++;
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}
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scpy(label, r->name, 0x40);
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}
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r->rune = rune;
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r->addr = addr;
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return 1;
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}
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static int
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writebyte(Uint8 b)
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{
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if(p.ptr < TRIM)
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return error("Writing in zero-page", "");
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else if(p.ptr > 0xffff)
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return error("Writing after the end of RAM", "");
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else if(p.ptr < p.length)
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return error("Memory overwrite", "");
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p.data[p.ptr++] = b;
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p.length = p.ptr;
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return 1;
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}
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static int
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writeopcode(char *w)
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{
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return writebyte(findopcode(w));
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}
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static int
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writeshort(Uint16 s, int lit)
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{
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if(lit)
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if(!writebyte(findopcode("LIT2"))) return 0;
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return writebyte(s >> 8) && writebyte(s & 0xff);
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}
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static int
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writelitbyte(Uint8 b)
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{
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return writebyte(findopcode("LIT")) && writebyte(b);
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}
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static int
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doinclude(const char *filename)
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{
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FILE *f;
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char w[0x40];
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if(!(f = fopen(filename, "r")))
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return error("Include missing", filename);
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while(fscanf(f, "%63s", w) == 1)
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if(!parse(w, f))
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return error("Unknown token", w);
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fclose(f);
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return 1;
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}
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static int
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parse(char *w, FILE *f)
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{
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int i;
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char word[0x40], subw[0x40], c;
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Label *l;
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Macro *m;
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if(slen(w) >= 63)
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return error("Invalid token", w);
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switch(w[0]) {
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case '(': /* comment */
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if(slen(w) != 1) fprintf(stderr, "-- Malformed comment: %s\n", w);
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i = 1; /* track nested comment depth */
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while(fscanf(f, "%63s", word) == 1) {
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if(slen(word) != 1)
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continue;
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else if(word[0] == '(')
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i++;
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else if(word[0] == ')' && --i < 1)
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break;
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}
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break;
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case '~': /* include */
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if(!doinclude(w + 1))
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return error("Invalid include", w);
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break;
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case '%': /* macro */
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if(!makemacro(w + 1, f))
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return error("Invalid macro", w);
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break;
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case '|': /* pad-absolute */
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if(sihx(w + 1))
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p.ptr = shex(w + 1);
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else if(w[1] == '&') {
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if(!sublabel(subw, p.scope, w + 2) || !(l = findlabel(subw)))
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return error("Invalid sublabel", w);
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p.ptr = l->addr;
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} else {
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if(!(l = findlabel(w + 1)))
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return error("Invalid label", w);
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p.ptr = l->addr;
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}
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break;
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case '$': /* pad-relative */
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if(sihx(w + 1))
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p.ptr += shex(w + 1);
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else if(w[1] == '&') {
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if(!sublabel(subw, p.scope, w + 2) || !(l = findlabel(subw)))
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return error("Invalid sublabel", w);
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p.ptr += l->addr;
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} else {
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if(!(l = findlabel(w + 1)))
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return error("Invalid label", w);
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p.ptr += l->addr;
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}
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break;
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case '@': /* label */
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if(!makelabel(w + 1))
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return error("Invalid label", w);
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scpy(w + 1, p.scope, 0x40);
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break;
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case '&': /* sublabel */
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if(!sublabel(subw, p.scope, w + 1) || !makelabel(subw))
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return error("Invalid sublabel", w);
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break;
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case '#': /* literals hex */
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if(sihx(w + 1) && slen(w) == 3)
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return writelitbyte(shex(w + 1));
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else if(sihx(w + 1) && slen(w) == 5)
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return writeshort(shex(w + 1), 1);
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else
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return error("Invalid hex literal", w);
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break;
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case '_': /* raw byte relative */
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makereference(p.scope, w + 1, w[0], p.ptr);
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return writebyte(0xff);
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case ',': /* literal byte relative */
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makereference(p.scope, w + 1, w[0], p.ptr + 1);
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return writelitbyte(0xff);
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case '-': /* raw byte absolute */
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makereference(p.scope, w + 1, w[0], p.ptr);
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return writebyte(0xff);
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case '.': /* literal byte zero-page */
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makereference(p.scope, w + 1, w[0], p.ptr + 1);
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return writelitbyte(0xff);
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case ':':
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case '=': /* raw short absolute */
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makereference(p.scope, w + 1, w[0], p.ptr);
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return writeshort(0xffff, 0);
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case ';': /* literal short absolute */
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makereference(p.scope, w + 1, w[0], p.ptr + 1);
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return writeshort(0xffff, 1);
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case '?': /* JCI */
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makereference(p.scope, w + 1, w[0], p.ptr + 1);
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return writebyte(0x20) && writeshort(0xffff, 0);
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case '!': /* JMI */
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makereference(p.scope, w + 1, w[0], p.ptr + 1);
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return writebyte(0x40) && writeshort(0xffff, 0);
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case '"': /* raw string */
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i = 0;
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while((c = w[++i]))
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if(!writebyte(c)) return 0;
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break;
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case '}': /* lambda end */
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if(!makelabel(makelambda(p.lambda_stack[--p.lambda_ptr])))
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return error("Invalid label", w);
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break;
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case '[':
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case ']':
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if(slen(w) == 1) break; /* else fallthrough */
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default:
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/* opcode */
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if(findopcode(w) || scmp(w, "BRK", 4))
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return writeopcode(w);
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/* raw byte */
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else if(sihx(w) && slen(w) == 2)
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return writebyte(shex(w));
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/* raw short */
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else if(sihx(w) && slen(w) == 4)
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return writeshort(shex(w), 0);
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/* macro */
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else if((m = findmacro(w))) {
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for(i = 0; i < m->len; i++)
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if(!parse(m->items[i], f))
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return 0;
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return 1;
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} else {
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makereference(p.scope, w, ' ', p.ptr + 1);
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return writebyte(0x60) && writeshort(0xffff, 0);
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}
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}
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return 1;
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}
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static int
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resolve(void)
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{
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Label *l;
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int i;
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Uint16 a;
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for(i = 0; i < p.refs_len; i++) {
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Reference *r = &p.refs[i];
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switch(r->rune) {
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case '_':
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case ',':
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if(!(l = findlabel(r->name)))
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return error("Unknown relative reference", r->name);
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p.data[r->addr] = (Sint8)(l->addr - r->addr - 2);
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if((Sint8)p.data[r->addr] != (l->addr - r->addr - 2))
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return error("Relative reference is too far", r->name);
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l->refs++;
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break;
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case '-':
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case '.':
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if(!(l = findlabel(r->name)))
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return error("Unknown zero-page reference", r->name);
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p.data[r->addr] = l->addr & 0xff;
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l->refs++;
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break;
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case ':':
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case '=':
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case ';':
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if(!(l = findlabel(r->name)))
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return error("Unknown absolute reference", r->name);
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p.data[r->addr] = l->addr >> 0x8;
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p.data[r->addr + 1] = l->addr & 0xff;
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l->refs++;
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break;
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case '?':
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case '!':
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default:
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if(!(l = findlabel(r->name)))
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return error("Unknown absolute reference", r->name);
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a = l->addr - r->addr - 2;
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p.data[r->addr] = a >> 0x8;
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p.data[r->addr + 1] = a & 0xff;
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l->refs++;
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break;
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}
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}
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return 1;
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}
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static int
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assemble(FILE *f)
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{
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char w[0x40];
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p.ptr = 0x100;
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scpy("on-reset", p.scope, 0x40);
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while(fscanf(f, "%62s", w) == 1)
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if(slen(w) > 0x3d || !parse(w, f))
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return error("Invalid token", w);
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return resolve();
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}
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static void
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review(char *filename)
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{
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int i;
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for(i = 0; i < p.label_len; i++)
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if(p.labels[i].name[0] >= 'A' && p.labels[i].name[0] <= 'Z')
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continue; /* Ignore capitalized labels(devices) */
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else if(!p.labels[i].refs)
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fprintf(stderr, "-- Unused label: %s\n", p.labels[i].name);
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fprintf(stderr,
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"Assembled %s in %d bytes(%.2f%% used), %d labels, %d macros.\n",
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filename,
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p.length - TRIM,
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(p.length - TRIM) / 652.80,
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p.label_len,
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p.macro_len);
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}
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static void
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writesym(char *filename)
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{
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int i;
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char symdst[0x60];
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FILE *fp;
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if(slen(filename) > 0x60 - 5)
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return;
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fp = fopen(scat(scpy(filename, symdst, slen(filename) + 1), ".sym"), "w");
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if(fp != NULL) {
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for(i = 0; i < p.label_len; i++) {
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Uint8 hb = p.labels[i].addr >> 8, lb = p.labels[i].addr & 0xff;
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fwrite(&hb, 1, 1, fp);
|
|
fwrite(&lb, 1, 1, fp);
|
|
fwrite(p.labels[i].name, slen(p.labels[i].name) + 1, 1, fp);
|
|
}
|
|
}
|
|
fclose(fp);
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
FILE *src, *dst;
|
|
if(argc == 1)
|
|
return error("usage", "uxnasm [-v] input.tal output.rom");
|
|
if(argv[1][0] == '-' && argv[1][1] == 'v')
|
|
return !fprintf(stdout, "Uxnasm - Uxntal Assembler, 8 Aug 2023.\n");
|
|
if(!(src = fopen(argv[1], "r")))
|
|
return !error("Invalid input", argv[1]);
|
|
if(!assemble(src))
|
|
return !error("Assembly", "Failed to assemble rom.");
|
|
if(!(dst = fopen(argv[2], "wb")))
|
|
return !error("Invalid Output", argv[2]);
|
|
if(p.length <= TRIM)
|
|
return !error("Assembly", "Output rom is empty.");
|
|
fwrite(p.data + TRIM, p.length - TRIM, 1, dst);
|
|
review(argv[2]);
|
|
writesym(argv[2]);
|
|
return 0;
|
|
}
|