mirror of
https://github.com/autc04/Retro68.git
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810 lines
17 KiB
C
810 lines
17 KiB
C
/* opc2c.c --- generate C opcode decoder code from from .opc file
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Copyright (C) 2005-2022 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU opcode library.
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "libiberty.h"
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static char * line_buf = NULL;
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static int line_buf_size = 0;
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#define LBUFINCR 100
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char *
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safe_fgets (FILE * f)
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{
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char * line_ptr;
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if (line_buf == NULL)
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{
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line_buf = (char *) malloc (LBUFINCR);
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line_buf_size = LBUFINCR;
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}
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/* Points to last byte. */
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line_ptr = line_buf + line_buf_size - 1;
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/* So we can see if fgets put a 0 there. */
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*line_ptr = 1;
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if (fgets (line_buf, line_buf_size, f) == 0)
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return NULL;
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/* We filled the buffer? */
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while (line_ptr[0] == 0 && line_ptr[-1] != '\n')
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{
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/* Make the buffer bigger and read more of the line. */
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line_buf_size += LBUFINCR;
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line_buf = (char *) realloc (line_buf, line_buf_size);
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/* Points to last byte again. */
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line_ptr = line_buf + line_buf_size - 1;
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/* So we can see if fgets put a 0 there. */
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*line_ptr = 1;
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if (fgets (line_buf + line_buf_size - LBUFINCR - 1, LBUFINCR + 1, f) == 0)
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return NULL;
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}
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return line_buf;
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}
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static int errors = 0;
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#define MAX_BYTES 10
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typedef struct
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{
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int varyno:16;
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int byte:8;
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int shift:8;
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} VaryRef;
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typedef struct
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{
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char nbytes;
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char dbytes;
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char id[MAX_BYTES * 8 + 1];
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unsigned char var_start[MAX_BYTES * 8 + 1];
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struct
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{
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unsigned char decodable_mask;
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unsigned char decodable_bits;
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} b[MAX_BYTES];
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char * comment;
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char * syntax;
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int lineno;
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int nlines;
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char ** lines;
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struct Indirect * last_ind;
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int semantics_label;
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int nvaries;
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VaryRef * vary;
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} opcode;
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int n_opcodes;
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opcode ** opcodes;
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opcode * op;
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typedef struct
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{
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char * name;
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int nlen;
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unsigned char mask;
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int n_patterns;
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unsigned char * patterns;
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} Vary;
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Vary ** vary = 0;
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int n_varies = 0;
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unsigned char cur_bits[MAX_BYTES + 1];
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const char * orig_filename;
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FILE * sim_log = NULL;
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#define lprintf if (sim_log) fprintf
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opcode prefix_text, suffix_text;
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typedef enum
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{
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T_unused,
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T_op,
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T_indirect,
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T_done
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} OpType;
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typedef struct Indirect
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{
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OpType type;
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union
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{
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struct Indirect * ind;
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opcode * op;
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} u;
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} Indirect;
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Indirect indirect[256];
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static int
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next_varybits (int bits, opcode * op, int byte)
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{
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int mask = op->b[byte].decodable_mask;
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int i;
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for (i = 0; i < 8; i++)
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if (!(mask & (1 << i)))
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{
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if (bits & (1 << i))
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{
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bits &= ~(1 << i);
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}
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else
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{
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bits |= (1 << i);
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return bits;
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}
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}
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return 0;
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}
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static int
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valid_varybits (int bits, opcode * op, int byte)
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{
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if (op->nvaries)
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{
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int vn;
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for (vn = 0; vn < op->nvaries; vn++)
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{
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Vary * v;
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int found = 0;
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int i;
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int ob;
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if (byte != op->vary[vn].byte)
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continue;
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v = vary[op->vary[vn].varyno];
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ob = (bits >> op->vary[vn].shift) & v->mask;
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lprintf (sim_log, "varybits: vary %s ob %x\n", v->name, ob);
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for (i = 0; i < v->n_patterns; i++)
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if (ob == v->patterns[i])
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{
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lprintf (sim_log, " found at %d\n", i);
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found = 1;
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break;
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}
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if (!found)
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return 0;
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}
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}
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return 1;
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}
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char *
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prmb (int mask, int bits)
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{
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static char buf[8][30];
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static int bn = 0;
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char * bp;
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bn = (bn + 1) % 8;
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bp = buf[bn];
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int i;
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for (i = 0; i < 8; i++)
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{
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int bit = 0x80 >> i;
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if (!(mask & bit))
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*bp++ = '-';
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else if (bits & bit)
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*bp++ = '1';
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else
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*bp++ = '0';
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if (i % 4 == 3)
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*bp++ = ' ';
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}
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*--bp = 0;
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return buf[bn];
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}
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static int
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op_cmp (const void *va, const void *vb)
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{
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const opcode * a = *(const opcode **) va;
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const opcode * b = *(const opcode **) vb;
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if (a->nbytes != b->nbytes)
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return a->nbytes - b->nbytes;
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return strcmp (a->id, b->id);
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}
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void
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dump_lines (opcode * op, int level, Indirect * ind)
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{
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char * varnames[40];
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int i, vn = 0;
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if (op->semantics_label)
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{
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printf ("%*sgoto op_semantics_%d;\n", level, "", op->semantics_label);
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return;
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}
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if (ind != op->last_ind)
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{
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static int labelno = 0;
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labelno++;
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printf ("%*sop_semantics_%d:\n", level, "", labelno);
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op->semantics_label = labelno;
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}
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if (op->comment)
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{
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level += 2;
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printf ("%*s{\n", level, "");
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printf ("%*s %s\n", level, "", op->comment);
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}
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for (i = 0; i < op->nbytes * 8;)
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{
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if (isalpha (op->id[i]))
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{
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int byte = i >> 3;
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int mask = 0;
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int shift = 0;
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char name[33];
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char * np = name;
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while (op->id[i] && isalpha (op->id[i]))
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{
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mask = (mask << 1) | 1;
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shift = 7 - (i & 7);
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*np++ = op->id[i++];
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if (op->var_start[i])
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break;
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}
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*np = 0;
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varnames[vn++] = strdup (name);
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printf ("#line %d \"%s\"\n", op->lineno + 1, orig_filename);
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if (mask & ~0xff)
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{
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fprintf (stderr, "Error: variable %s spans bytes: %s\n",
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name, op->comment);
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errors++;
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}
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else if (shift && (mask != 0xff))
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printf ("%*s int %s AU = (op[%d] >> %d) & 0x%02x;\n",
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level, "", name, byte, shift, mask);
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else if (mask != 0xff)
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printf ("%*s int %s AU = op[%d] & 0x%02x;\n",
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level, "", name, byte, mask);
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else
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printf ("%*s int %s AU = op[%d];\n", level, "", name, byte);
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}
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else
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i++;
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}
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if (op->comment)
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{
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printf ("%*s if (trace)\n", level, "");
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printf ("%*s {\n", level, "");
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printf ("%*s printf (\"\\033[33m%%s\\033[0m ", level, "");
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for (i = 0; i < op->nbytes; i++)
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printf (" %%02x");
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printf ("\\n\"");
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printf (",\n%*s \"%s\"", level, "", op->comment);
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for (i = 0; i < op->nbytes; i++)
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{
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if (i == 0)
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printf (",\n%*s op[%d]", level, "", i);
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else
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printf (", op[%d]", i);
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}
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printf (");\n");
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for (i = 0; i < vn; i++)
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printf ("%*s printf (\" %s = 0x%%x%s\", %s);\n", level, "",
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varnames[i], (i < vn - 1) ? "," : "\\n", varnames[i]);
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printf ("%*s }\n", level, "");
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}
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if (op->syntax)
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printf ("%*s SYNTAX(\"%s\");\n", level, "", op->syntax);
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printf ("#line %d \"%s\"\n", op->lineno + 1, orig_filename);
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for (i = 0; i < op->nlines; i++)
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if (op->lines[i][0] == '\n')
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printf ("%s", op->lines[i]);
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else
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printf ("%*s%s", level, "", op->lines[i]);
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if (op->comment)
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printf ("%*s}\n", level, "");
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}
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void
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store_opcode_bits (opcode * op, int byte, Indirect * ind)
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{
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int bits = op->b[byte].decodable_bits;
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do
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{
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if (!valid_varybits (bits, op, byte))
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continue;
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switch (ind[bits].type)
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{
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case T_unused:
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if (byte == op->dbytes - 1)
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{
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ind[bits].type = T_op;
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ind[bits].u.op = op;
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op->last_ind = ind;
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break;
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}
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else
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{
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int i2;
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ind[bits].type = T_indirect;
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ind[bits].u.ind = (Indirect *) malloc (256 * sizeof (Indirect));
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for (i2 = 0; i2 < 256; i2++)
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ind[bits].u.ind[i2].type = T_unused;
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store_opcode_bits (op, byte + 1, ind[bits].u.ind);
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}
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break;
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case T_indirect:
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if (byte < op->dbytes - 1)
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store_opcode_bits (op, byte + 1, ind[bits].u.ind);
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break;
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case T_op:
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break;
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case T_done:
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break;
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}
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}
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while ((bits = next_varybits (bits, op, byte)) != 0);
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}
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void
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emit_indirect (Indirect * ind, int byte)
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{
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int unsup = 0;
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int j, n, mask;
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mask = 0;
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for (j = 0; j < 256; j++)
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{
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switch (ind[j].type)
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{
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case T_indirect:
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mask = 0xff;
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break;
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case T_op:
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mask |= ind[j].u.op->b[byte].decodable_mask;
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break;
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case T_done:
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case T_unused:
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break;
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}
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}
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printf ("%*s GETBYTE ();\n", byte * 6, "");
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printf ("%*s switch (op[%d] & 0x%02x)\n", byte * 6, "", byte, mask);
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printf ("%*s {\n", byte * 6, "");
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for (j = 0; j < 256; j++)
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if ((j & ~mask) == 0)
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{
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switch (ind[j].type)
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{
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case T_done:
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break;
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case T_unused:
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unsup = 1;
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break;
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case T_op:
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for (n = j; n < 256; n++)
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if ((n & ~mask) == 0
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&& ind[n].type == T_op && ind[n].u.op == ind[j].u.op)
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{
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ind[n].type = T_done;
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printf ("%*s case 0x%02x:\n", byte * 6, "", n);
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}
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for (n = byte; n < ind[j].u.op->nbytes - 1; n++)
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printf ("%*s GETBYTE();\n", byte * 6, "");
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dump_lines (ind[j].u.op, byte * 6 + 6, ind);
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printf ("%*s break;\n", byte * 6, "");
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break;
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case T_indirect:
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printf ("%*s case 0x%02x:\n", byte * 6, "", j);
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emit_indirect (ind[j].u.ind, byte + 1);
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printf ("%*s break;\n", byte * 6, "");
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break;
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}
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}
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if (unsup)
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printf ("%*s default: UNSUPPORTED(); break;\n", byte * 6, "");
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printf ("%*s }\n", byte * 6, "");
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}
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static char *
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pv_dup (char * p, char * ep)
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{
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int n = ep - p;
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char *rv = (char *) malloc (n + 1);
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memcpy (rv, p, n);
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rv[n] = 0;
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return rv;
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}
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static unsigned char
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str2mask (char * str, char * ep)
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{
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unsigned char rv = 0;
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while (str < ep)
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{
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rv *= 2;
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if (*str == '1')
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rv += 1;
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str++;
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}
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return rv;
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}
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static void
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process_vary (char * line)
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{
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char * cp;
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char * ep;
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Vary * v = (Vary *) malloc (sizeof (Vary));
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n_varies++;
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if (vary)
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vary = (Vary **) realloc (vary, n_varies * sizeof (Vary *));
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else
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vary = (Vary **) malloc (n_varies * sizeof (Vary *));
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vary[n_varies - 1] = v;
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cp = line;
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for (cp = line; isspace (*cp); cp++);
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for (ep = cp; *ep && !isspace (*ep); ep++);
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v->name = pv_dup (cp, ep);
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v->nlen = strlen (v->name);
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v->mask = (1 << v->nlen) - 1;
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v->n_patterns = 0;
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v->patterns = (unsigned char *) malloc (1);
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while (1)
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{
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for (cp = ep; isspace (*cp); cp++);
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if (!isdigit (*cp))
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break;
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for (ep = cp; *ep && !isspace (*ep); ep++);
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v->n_patterns++;
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v->patterns = (unsigned char *) realloc (v->patterns, v->n_patterns);
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v->patterns[v->n_patterns - 1] = str2mask (cp, ep);
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}
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}
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static int
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fieldcmp (opcode * op, int bit, char *name)
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{
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int n = strlen (name);
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if (memcmp (op->id + bit, name, n) == 0
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&& (!isalpha (op->id[bit + n]) || op->var_start[bit + n]))
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return 1;
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return 0;
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}
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static void
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log_indirect (Indirect * ind, int byte)
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{
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int i, j;
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char * last_c = 0;
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for (i = 0; i < 256; i++)
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{
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for (j = 0; j < byte; j++)
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fprintf (sim_log, "%s ", prmb (255, cur_bits[j]));
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fprintf (sim_log, "%s ", prmb (255, i));
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switch (ind[i].type)
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{
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case T_op:
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case T_done:
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if (last_c && (ind[i].u.op->comment == last_c))
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fprintf (sim_log, "''\n");
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else
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fprintf (sim_log, "%s\n", ind[i].u.op->comment);
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last_c = ind[i].u.op->comment;
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break;
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case T_unused:
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fprintf (sim_log, "unused\n");
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break;
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case T_indirect:
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fprintf (sim_log, "indirect\n");
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cur_bits[byte] = i;
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log_indirect (ind[i].u.ind, byte + 1);
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last_c = 0;
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break;
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}
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}
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}
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int
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main (int argc, char ** argv)
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{
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char * line;
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FILE * in;
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int lineno = 0;
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int i;
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VaryRef * vlist;
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int skipping_section = 0;
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if (argc < 2)
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{
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fprintf (stderr, "usage: opc2c infile.opc > outfile.opc\n");
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exit (1);
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}
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orig_filename = lbasename (argv[1]);
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in = fopen (argv[1], "r");
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if (!in)
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{
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fprintf (stderr, "Unable to open file %s for reading: %s\n", argv[1],
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xstrerror (errno));
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exit (1);
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}
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n_opcodes = 0;
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opcodes = (opcode **) malloc (sizeof (opcode *));
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op = &prefix_text;
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op->lineno = 0;
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while ((line = safe_fgets (in)) != 0)
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{
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lineno++;
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if (strncmp (line, "/*?* ", 5) == 0)
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{
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skipping_section = 1;
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continue;
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}
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if (strncmp (line, " /** ", 6) == 0
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&& (isdigit (line[6]) || memcmp (line + 6, "VARY", 4) == 0))
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line += 2;
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if (line[0] == '/' && line[1] == '*' && line[2] == '*')
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{
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skipping_section = 0;
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if (strncmp (line, "/** */", 6) == 0)
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{
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op = &suffix_text;
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op->lineno = lineno;
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}
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else if (strncmp (line, "/** VARY ", 9) == 0)
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process_vary (line + 9);
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else
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{
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char * lp;
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int i, bit, byte;
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int var_start = 1;
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n_opcodes++;
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opcodes =
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(opcode **) realloc (opcodes, n_opcodes * sizeof (opcode *));
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op = (opcode *) malloc (sizeof (opcode));
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opcodes[n_opcodes - 1] = op;
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op->nbytes = op->dbytes = 0;
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memset (op->id, 0, sizeof (op->id));
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memset (op->var_start, 0, sizeof (op->var_start));
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for (i = 0; i < MAX_BYTES; i++)
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{
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op->b[i].decodable_mask = 0;
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op->b[i].decodable_bits = 0;
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}
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op->comment = strdup (line);
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op->comment[strlen (op->comment) - 1] = 0;
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while (op->comment[0] && isspace (op->comment[0]))
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op->comment++;
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op->lineno = lineno;
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op->nlines = 0;
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op->lines = 0;
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op->last_ind = 0;
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op->semantics_label = 0;
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op->nvaries = 0;
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op->vary = 0;
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i = 0;
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for (lp = line + 4; *lp; lp++)
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{
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bit = 7 - (i & 7);
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byte = i >> 3;
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if (strncmp (lp, "*/", 2) == 0)
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break;
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else if ((lp[0] == ' ' && lp[1] == ' ') || (lp[0] == '\t'))
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{
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while (*lp == ' ' || *lp == '\t')
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lp ++;
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op->syntax = strdup (lp);
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lp = strstr (op->syntax, "*/");
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if (lp)
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{
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*lp-- = 0;
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while ((*lp == ' ' || *lp == '\t')
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&& lp > op->syntax)
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*lp-- = 0;
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}
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break;
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}
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else if (*lp == ' ')
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var_start = 1;
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else
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{
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if (*lp == '0' || *lp == '1')
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{
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op->b[byte].decodable_mask |= 1 << bit;
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var_start = 1;
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if (op->dbytes < byte + 1)
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op->dbytes = byte + 1;
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}
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else if (var_start)
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{
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op->var_start[i] = 1;
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var_start = 0;
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if (op->dbytes < byte + 1)
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op->dbytes = byte + 1;
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}
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if (*lp == '1')
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op->b[byte].decodable_bits |= 1 << bit;
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op->nbytes = byte + 1;
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op->id[i++] = *lp;
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}
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}
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}
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}
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else if (!skipping_section)
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{
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op->nlines++;
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if (op->lines)
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op->lines =
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(char **) realloc (op->lines, op->nlines * sizeof (char *));
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else
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op->lines = (char **) malloc (op->nlines * sizeof (char *));
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op->lines[op->nlines - 1] = strdup (line);
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}
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}
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{
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int i, j;
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for (i = 0; i < n_varies; i++)
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{
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Vary *v = vary[i];
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lprintf (sim_log, "V[%s] %d\n", v->name, v->nlen);
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for (j = 0; j < v->n_patterns; j++)
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lprintf (sim_log, " P %02x\n", v->patterns[j]);
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}
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}
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for (i = n_opcodes - 2; i >= 0; i--)
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{
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if (opcodes[i]->nlines == 0)
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{
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opcodes[i]->nlines = opcodes[i + 1]->nlines;
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opcodes[i]->lines = opcodes[i + 1]->lines;
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}
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}
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for (i = 0; i < 256; i++)
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indirect[i].type = T_unused;
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qsort (opcodes, n_opcodes, sizeof (opcodes[0]), op_cmp);
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vlist = (VaryRef *) malloc (n_varies * sizeof (VaryRef));
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for (i = 0; i < n_opcodes; i++)
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{
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int j, b, v;
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for (j = 0; j < opcodes[i]->nbytes; j++)
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lprintf (sim_log, "%s ",
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prmb (opcodes[i]->b[j].decodable_mask,
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opcodes[i]->b[j].decodable_bits));
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lprintf (sim_log, " %s\n", opcodes[i]->comment);
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for (j = 0; j < opcodes[i]->nbytes; j++)
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{
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for (b = 0; b < 8; b++)
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if (isalpha (opcodes[i]->id[j * 8 + b]))
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for (v = 0; v < n_varies; v++)
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if (fieldcmp (opcodes[i], j * 8 + b, vary[v]->name))
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{
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int nv = opcodes[i]->nvaries++;
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if (nv)
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opcodes[i]->vary =
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(VaryRef *) realloc (opcodes[i]->vary,
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(nv + 1) * sizeof (VaryRef));
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else
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opcodes[i]->vary =
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(VaryRef *) malloc ((nv + 1) * sizeof (VaryRef));
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opcodes[i]->vary[nv].varyno = v;
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opcodes[i]->vary[nv].byte = j;
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opcodes[i]->vary[nv].shift = 8 - b - vary[v]->nlen;
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lprintf (sim_log, "[vary %s shift %d]\n",
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vary[v]->name, opcodes[i]->vary[nv].shift);
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}
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}
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}
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for (i = 0; i < n_opcodes; i++)
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{
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int i2;
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int bytes = opcodes[i]->dbytes;
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lprintf (sim_log, "\nmask:");
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for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
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lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_mask);
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lprintf (sim_log, "%*s%s\n", 13 - 3 * opcodes[i]->nbytes, "",
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opcodes[i]->comment);
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lprintf (sim_log, "bits:");
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for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
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lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_bits);
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lprintf (sim_log, "%*s(%s) %d byte%s\n", 13 - 3 * opcodes[i]->nbytes,
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"", opcodes[i]->id, bytes, bytes == 1 ? "" : "s");
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store_opcode_bits (opcodes[i], 0, indirect);
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}
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printf ("/* DO NOT EDIT! -*- buffer-read-only: t -*- vi:set ro: */\n");
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dump_lines (&prefix_text, 0, 0);
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emit_indirect (indirect, 0);
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dump_lines (&suffix_text, 0, 0);
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if (sim_log)
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log_indirect (indirect, 0);
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return errors;
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}
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