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585 lines
12 KiB
C
585 lines
12 KiB
C
/*
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* Adaptec 274x device driver for Linux.
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* Copyright (c) 1994 The University of Calgary Department of Computer Science.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Comments are started by `#' and continue to the end of the line; lines
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* may be of the form:
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*
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* <label>*
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* <label>* <undef-sym> = <value>
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* <label>* <opcode> <operand>*
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*
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* A <label> is an <undef-sym> ending in a colon. Spaces, tabs, and commas
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* are token separators.
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*/
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/* #define _POSIX_SOURCE 1 */
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#define _POSIX_C_SOURCE 2
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define MEMORY 512 /* 2^9 29-bit words */
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#define MAXLINE 1024
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#define MAXTOKEN 32
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#define ADOTOUT "a.out"
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#define NOVALUE -1
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/*
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* AIC-7770 register definitions
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*/
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#define R_SINDEX 0x65
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#define R_ALLONES 0x69
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#define R_ALLZEROS 0x6a
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#define R_NONE 0x6a
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static
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char sccsid[] =
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"@(#)aic7770.c 1.10 94/07/22 jda";
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int debug;
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int lineno, LC;
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char *filename;
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FILE *ifp, *ofp;
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unsigned char M[MEMORY][4];
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void error(char *s)
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{
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fprintf(stderr, "%s: %s at line %d\n", filename, s, lineno);
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exit(EXIT_FAILURE);
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}
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void *Malloc(size_t size)
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{
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void *p = malloc(size);
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if (!p)
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error("out of memory");
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return(p);
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}
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void *Realloc(void *ptr, size_t size)
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{
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void *p = realloc(ptr, size);
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if (!p)
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error("out of memory");
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return(p);
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}
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char *Strdup(char *s)
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{
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char *p = (char *)Malloc(strlen(s) + 1);
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strcpy(p, s);
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return(p);
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}
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typedef struct sym_t {
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struct sym_t *next; /* MUST BE FIRST */
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char *name;
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int value;
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int npatch, *patch;
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} sym_t;
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sym_t *head;
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void define(char *name, int value)
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{
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sym_t *p, *q;
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for (p = head, q = (sym_t *)&head; p; p = p->next) {
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if (!strcmp(p->name, name))
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error("redefined symbol");
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q = p;
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}
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p = q->next = (sym_t *)Malloc(sizeof(sym_t));
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p->next = NULL;
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p->name = Strdup(name);
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p->value = value;
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p->npatch = 0;
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p->patch = NULL;
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if (debug) {
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fprintf(stderr, "\"%s\" ", p->name);
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if (p->value != NOVALUE)
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fprintf(stderr, "defined as 0x%x\n", p->value);
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else
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fprintf(stderr, "undefined\n");
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}
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}
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sym_t *lookup(char *name)
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{
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sym_t *p;
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for (p = head; p; p = p->next)
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if (!strcmp(p->name, name))
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return(p);
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return(NULL);
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}
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void patch(sym_t *p, int location)
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{
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p->npatch += 1;
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p->patch = (int *)Realloc(p->patch, p->npatch * sizeof(int *));
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p->patch[p->npatch - 1] = location;
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}
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void backpatch(void)
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{
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int i;
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sym_t *p;
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for (p = head; p; p = p->next) {
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if (p->value == NOVALUE) {
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fprintf(stderr,
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"%s: undefined symbol \"%s\"\n",
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filename, p->name);
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exit(EXIT_FAILURE);
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}
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if (p->npatch) {
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if (debug)
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fprintf(stderr,
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"\"%s\" (0x%x) patched at",
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p->name, p->value);
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for (i = 0; i < p->npatch; i++) {
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M[p->patch[i]][0] &= ~1;
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M[p->patch[i]][0] |= ((p->value >> 8) & 1);
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M[p->patch[i]][1] = p->value & 0xff;
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if (debug)
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fprintf(stderr, " 0x%x", p->patch[i]);
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}
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if (debug)
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fputc('\n', stderr);
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}
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}
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}
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/*
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* Output words in byte-reversed order (least significant first)
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* since the sequencer RAM is loaded that way.
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*/
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void output(FILE *fp)
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{
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int i;
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for (i = 0; i < LC; i++)
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fprintf(fp, "\t0x%02x, 0x%02x, 0x%02x, 0x%02x,\n",
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M[i][3],
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M[i][2],
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M[i][1],
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M[i][0]);
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}
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char **getl(int *n)
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{
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int i;
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char *p;
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static char buf[MAXLINE];
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static char *a[MAXTOKEN];
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i = 0;
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while (fgets(buf, sizeof(buf), ifp)) {
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lineno += 1;
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if (buf[strlen(buf)-1] != '\n')
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error("line too long");
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p = strchr(buf, '#');
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if (p)
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*p = '\0';
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for (p = strtok(buf, ", \t\n"); p; p = strtok(NULL, ", \t\n"))
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if (i < MAXTOKEN-1)
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a[i++] = p;
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else
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error("too many tokens");
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if (i) {
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*n = i;
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return(a);
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}
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}
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return(NULL);
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}
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#define A 0x8000 /* `A'ccumulator ok */
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#define I 0x4000 /* use as immediate value */
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#define SL 0x2000 /* shift left */
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#define SR 0x1000 /* shift right */
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#define RL 0x0800 /* rotate left */
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#define RR 0x0400 /* rotate right */
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#define LO 0x8000 /* lookup: ori-{jmp,jc,jnc,call} */
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#define LA 0x4000 /* lookup: and-{jz,jnz} */
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#define LX 0x2000 /* lookup: xor-{je,jne} */
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#define NA -1 /* not applicable */
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struct {
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char *name;
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int n; /* number of operands, including opcode */
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unsigned int op; /* immediate or L?|pos_from_0 */
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unsigned int dest; /* NA, pos_from_0, or I|immediate */
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unsigned int src; /* NA, pos_from_0, or I|immediate */
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unsigned int imm; /* pos_from_0, A|pos_from_0, or I|immediate */
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unsigned int addr; /* NA or pos_from_0 */
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int fmt; /* instruction format - 1, 2, or 3 */
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} instr[] = {
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/*
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* N OP DEST SRC IMM ADDR FMT
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*/
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"mov", 3, 1, 1, 2, I|0xff, NA, 1,
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"mov", 4, LO|2, NA, 1, I|0, 3, 3,
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"mvi", 3, 0, 1, I|R_ALLZEROS, A|2, NA, 1,
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"mvi", 4, LO|2, NA, I|R_ALLZEROS, 1, 3, 3,
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"not", 2, 2, 1, 1, I|0xff, NA, 1,
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"not", 3, 2, 1, 2, I|0xff, NA, 1,
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"and", 3, 1, 1, 1, A|2, NA, 1,
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"and", 4, 1, 1, 3, A|2, NA, 1,
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"or", 3, 0, 1, 1, A|2, NA, 1,
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"or", 4, 0, 1, 3, A|2, NA, 1,
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"or", 5, LO|3, NA, 1, 2, 4, 3,
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"xor", 3, 2, 1, 1, A|2, NA, 1,
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"xor", 4, 2, 1, 3, A|2, NA, 1,
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"nop", 1, 1, I|R_NONE, I|R_ALLZEROS, I|0xff, NA, 1,
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"inc", 2, 3, 1, 1, I|1, NA, 1,
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"inc", 3, 3, 1, 2, I|1, NA, 1,
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"dec", 2, 3, 1, 1, I|0xff, NA, 1,
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"dec", 3, 3, 1, 2, I|0xff, NA, 1,
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"jmp", 2, LO|0, NA, I|R_SINDEX, I|0, 1, 3,
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"jc", 2, LO|0, NA, I|R_SINDEX, I|0, 1, 3,
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"jnc", 2, LO|0, NA, I|R_SINDEX, I|0, 1, 3,
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"call", 2, LO|0, NA, I|R_SINDEX, I|0, 1, 3,
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"test", 5, LA|3, NA, 1, A|2, 4, 3,
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"cmp", 5, LX|3, NA, 1, A|2, 4, 3,
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"ret", 1, 1, I|R_NONE, I|R_ALLZEROS, I|0xff, NA, 1,
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"clc", 1, 3, I|R_NONE, I|R_ALLZEROS, I|1, NA, 1,
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"clc", 4, 3, 2, I|R_ALLZEROS, A|3, NA, 1,
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"stc", 1, 3, I|R_NONE, I|R_ALLONES, I|1, NA, 1,
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"stc", 2, 3, 1, I|R_ALLONES, I|1, NA, 1,
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"add", 3, 3, 1, 1, A|2, NA, 1,
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"add", 4, 3, 1, 3, A|2, NA, 1,
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"adc", 3, 4, 1, 1, A|2, NA, 1,
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"adc", 4, 4, 1, 3, A|2, NA, 1,
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"shl", 3, 5, 1, 1, SL|2, NA, 2,
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"shl", 4, 5, 1, 2, SL|3, NA, 2,
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"shr", 3, 5, 1, 1, SR|2, NA, 2,
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"shr", 4, 5, 1, 2, SR|3, NA, 2,
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"rol", 3, 5, 1, 1, RL|2, NA, 2,
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"rol", 4, 5, 1, 2, RL|3, NA, 2,
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"ror", 3, 5, 1, 1, RR|2, NA, 2,
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"ror", 4, 5, 1, 2, RR|3, NA, 2,
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/*
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* Extensions (note also that mvi allows A)
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*/
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"clr", 2, 1, 1, I|R_ALLZEROS, I|0xff, NA, 1,
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0
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};
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int eval_operand(char **a, int spec)
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{
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int i;
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unsigned int want = spec & (LO|LA|LX);
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static struct {
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unsigned int what;
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char *name;
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int value;
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} jmptab[] = {
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LO, "jmp", 8,
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LO, "jc", 9,
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LO, "jnc", 10,
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LO, "call", 11,
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LA, "jz", 15,
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LA, "jnz", 13,
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LX, "je", 14,
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LX, "jne", 12,
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};
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spec &= ~(LO|LA|LX);
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for (i = 0; i < sizeof(jmptab)/sizeof(jmptab[0]); i++)
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if (jmptab[i].what == want &&
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!strcmp(jmptab[i].name, a[spec]))
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{
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return(jmptab[i].value);
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}
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if (want)
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error("invalid jump");
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return(spec); /* "case 0" - no flags set */
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}
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int eval_sdi(char **a, int spec)
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{
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sym_t *p;
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unsigned val;
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if (spec == NA)
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return(NA);
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switch (spec & (A|I|SL|SR|RL|RR)) {
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case SL:
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case SR:
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case RL:
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case RR:
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if (isdigit(*a[spec &~ (SL|SR|RL|RR)]))
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val = strtol(a[spec &~ (SL|SR|RL|RR)], NULL, 0);
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else {
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p = lookup(a[spec &~ (SL|SR|RL|RR)]);
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if (!p)
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error("undefined symbol used");
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val = p->value;
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}
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switch (spec & (SL|SR|RL|RR)) { /* blech */
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case SL:
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if (val > 7)
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return(0xf0);
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return(((val % 8) << 4) |
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(val % 8));
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case SR:
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if (val > 7)
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return(0xf0);
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return(((val % 8) << 4) |
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(1 << 3) |
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((8 - (val % 8)) % 8));
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case RL:
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return(val % 8);
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case RR:
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return((8 - (val % 8)) % 8);
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}
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case I:
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return(spec &~ I);
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case A:
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/*
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* An immediate field of zero selects
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* the accumulator. Vigorously object
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* if zero is given otherwise - it's
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* most likely an error.
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*/
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spec &= ~A;
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if (!strcmp("A", a[spec]))
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return(0);
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if (isdigit(*a[spec]) &&
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strtol(a[spec], NULL, 0) == 0)
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{
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error("immediate value of zero selects accumulator");
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}
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/* falls through */
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case 0:
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if (isdigit(*a[spec]))
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return(strtol(a[spec], NULL, 0));
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p = lookup(a[spec]);
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if (p)
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return(p->value);
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error("undefined symbol used");
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}
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return(NA); /* shut the compiler up */
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}
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int eval_addr(char **a, int spec)
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{
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sym_t *p;
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if (spec == NA)
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return(NA);
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if (isdigit(*a[spec]))
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return(strtol(a[spec], NULL, 0));
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p = lookup(a[spec]);
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if (p) {
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if (p->value != NOVALUE)
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return(p->value);
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patch(p, LC);
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} else {
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define(a[spec], NOVALUE);
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p = lookup(a[spec]);
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patch(p, LC);
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}
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return(NA); /* will be patched in later */
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}
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int crack(char **a, int n)
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{
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int i;
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int I_imm, I_addr;
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int I_op, I_dest, I_src, I_ret;
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/*
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* Check for "ret" at the end of the line; remove
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* it unless it's "ret" alone - we still want to
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* look it up in the table.
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*/
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I_ret = (strcmp(a[n-1], "ret") ? 0 : !0);
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if (I_ret && n > 1)
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n -= 1;
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for (i = 0; instr[i].name; i++) {
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/*
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* Look for match in table given constraints,
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* currently just the name and the number of
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* operands.
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*/
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if (!strcmp(instr[i].name, *a) && instr[i].n == n)
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break;
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}
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if (!instr[i].name)
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error("unknown opcode or wrong number of operands");
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I_op = eval_operand(a, instr[i].op);
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I_src = eval_sdi(a, instr[i].src);
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I_imm = eval_sdi(a, instr[i].imm);
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I_dest = eval_sdi(a, instr[i].dest);
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I_addr = eval_addr(a, instr[i].addr);
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switch (instr[i].fmt) {
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case 1:
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case 2:
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M[LC][0] = (I_op << 1) | I_ret;
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M[LC][1] = I_dest;
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M[LC][2] = I_src;
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M[LC][3] = I_imm;
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break;
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case 3:
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if (I_ret)
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error("illegal use of \"ret\"");
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M[LC][0] = (I_op << 1) | ((I_addr >> 8) & 1);
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M[LC][1] = I_addr & 0xff;
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M[LC][2] = I_src;
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M[LC][3] = I_imm;
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break;
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}
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return(1); /* no two-byte instructions yet */
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}
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#undef SL
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#undef SR
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#undef RL
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#undef RR
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#undef LX
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#undef LA
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#undef LO
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#undef I
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#undef A
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void assemble(void)
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{
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int n;
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char **a;
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sym_t *p;
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while ((a = getl(&n))) {
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while (a[0][strlen(*a)-1] == ':') {
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a[0][strlen(*a)-1] = '\0';
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p = lookup(*a);
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if (p)
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p->value = LC;
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else
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define(*a, LC);
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a += 1;
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n -= 1;
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}
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if (!n) /* line was all labels */
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continue;
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if (n == 3 && !strcmp("VERSION", *a))
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fprintf(ofp, "#define %s \"%s\"\n", a[1], a[2]);
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else {
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if (n == 3 && !strcmp("=", a[1]))
|
|
define(*a, strtol(a[2], NULL, 0));
|
|
else
|
|
LC += crack(a, n);
|
|
}
|
|
}
|
|
|
|
backpatch();
|
|
output(ofp);
|
|
|
|
if (debug)
|
|
output(stderr);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int c;
|
|
|
|
while ((c = getopt(argc, argv, "dho:")) != EOF) {
|
|
switch (c) {
|
|
case 'd':
|
|
debug = !0;
|
|
break;
|
|
case 'o':
|
|
ofp = fopen(optarg, "w");
|
|
if (!ofp) {
|
|
perror(optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case 'h':
|
|
printf("usage: %s [-d] [-ooutput] input\n", *argv);
|
|
exit(EXIT_SUCCESS);
|
|
case NULL:
|
|
/*
|
|
* An impossible option to shut the compiler
|
|
* up about sccsid[].
|
|
*/
|
|
exit((int)sccsid);
|
|
default:
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if (argc - optind != 1) {
|
|
fprintf(stderr, "%s: must have one input file\n", *argv);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
filename = argv[optind];
|
|
|
|
ifp = fopen(filename, "r");
|
|
if (!ifp) {
|
|
perror(filename);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (!ofp) {
|
|
ofp = fopen(ADOTOUT, "w");
|
|
if (!ofp) {
|
|
perror(ADOTOUT);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
assemble();
|
|
exit(EXIT_SUCCESS);
|
|
}
|