binutils-gdb/sim/m32c/opc2c.c
Andrew Burgess 1d506c26d9 Update copyright year range in header of all files managed by GDB
This commit is the result of the following actions:

  - Running gdb/copyright.py to update all of the copyright headers to
    include 2024,

  - Manually updating a few files the copyright.py script told me to
    update, these files had copyright headers embedded within the
    file,

  - Regenerating gdbsupport/Makefile.in to refresh it's copyright
    date,

  - Using grep to find other files that still mentioned 2023.  If
    these files were updated last year from 2022 to 2023 then I've
    updated them this year to 2024.

I'm sure I've probably missed some dates.  Feel free to fix them up as
you spot them.
2024-01-12 15:49:57 +00:00

731 lines
16 KiB
C

/* opc2c.c --- generate C simulator code from from .opc file
Copyright (C) 2005-2024 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of the GNU simulators.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This must come before any other includes. */
#include "defs.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
static int errors = 0;
#define MAX_BYTES 10
typedef struct
{
int varyno:16;
int byte:8;
int shift:8;
} VaryRef;
typedef struct
{
char nbytes;
char dbytes;
char id[MAX_BYTES * 8 + 1];
unsigned char var_start[MAX_BYTES * 8 + 1];
struct
{
unsigned char decodable_mask;
unsigned char decodable_bits;
} b[MAX_BYTES];
char *comment;
int lineno;
int nlines;
char **lines;
struct Indirect *last_ind;
int semantics_label;
int nvaries;
VaryRef *vary;
} opcode;
static int n_opcodes;
static opcode **opcodes;
static opcode *op;
typedef struct
{
char *name;
int nlen;
unsigned char mask;
int n_patterns;
unsigned char *patterns;
} Vary;
static Vary **vary = 0;
static int n_varies = 0;
static unsigned char cur_bits[MAX_BYTES + 1];
static char *orig_filename;
static FILE *sim_log = 0;
#define lprintf if (sim_log) fprintf
static opcode prefix_text, suffix_text;
typedef enum
{
T_unused,
T_op,
T_indirect,
T_done
} OpType;
typedef struct Indirect
{
OpType type;
union
{
struct Indirect *ind;
opcode *op;
} u;
} Indirect;
static Indirect indirect[256];
static int
next_varybits (int bits, opcode * op, int byte)
{
int mask = op->b[byte].decodable_mask;
int i;
for (i = 0; i < 8; i++)
if (!(mask & (1 << i)))
{
if (bits & (1 << i))
{
bits &= ~(1 << i);
}
else
{
bits |= (1 << i);
return bits;
}
}
return 0;
}
static int
valid_varybits (int bits, opcode * op, int byte)
{
if (op->nvaries)
{
int vn;
for (vn = 0; vn < op->nvaries; vn++)
{
int found = 0;
int i;
int ob;
Vary *v;
if (byte != op->vary[vn].byte)
continue;
v = vary[op->vary[vn].varyno];
ob = (bits >> op->vary[vn].shift) & v->mask;
lprintf (sim_log, "varybits: vary %s ob %x\n", v->name, ob);
for (i = 0; i < v->n_patterns; i++)
if (ob == v->patterns[i])
{
lprintf (sim_log, " found at %d\n", i);
found = 1;
break;
}
if (!found)
return 0;
}
}
return 1;
}
static char *
prmb (int mask, int bits)
{
static char buf[8][30];
static int bn = 0;
char *bp;
int i;
bn = (bn + 1) % 8;
bp = buf[bn];
for (i = 0; i < 8; i++)
{
int bit = 0x80 >> i;
if (!(mask & bit))
*bp++ = '-';
else if (bits & bit)
*bp++ = '1';
else
*bp++ = '0';
if (i % 4 == 3)
*bp++ = ' ';
}
*--bp = 0;
return buf[bn];
}
static int
op_cmp (const void *va, const void *vb)
{
const opcode *a = *(const opcode **) va;
const opcode *b = *(const opcode **) vb;
if (a->nbytes != b->nbytes)
return a->nbytes - b->nbytes;
return strcmp (a->id, b->id);
}
static void
dump_lines (opcode * op, int level, Indirect * ind)
{
char *varnames[40];
int i, vn = 0;
if (op->semantics_label)
{
printf ("%*sgoto op_semantics_%d;\n", level, "", op->semantics_label);
return;
}
if (ind != op->last_ind)
{
static int labelno = 0;
labelno++;
printf ("%*sop_semantics_%d:\n", level, "", labelno);
op->semantics_label = labelno;
}
if (op->comment)
{
level += 2;
printf ("%*s{\n", level, "");
printf ("%*s %s\n", level, "", op->comment);
}
for (i = 0; i < op->nbytes * 8;)
{
if (isalpha (op->id[i]))
{
int byte = i >> 3;
int mask = 0;
int shift = 0;
char name[33];
char *np = name;
while (op->id[i] && isalpha (op->id[i]))
{
mask = (mask << 1) | 1;
shift = 7 - (i & 7);
*np++ = op->id[i++];
if (op->var_start[i])
break;
}
*np = 0;
varnames[vn++] = strdup (name);
printf ("#line %d \"%s\"\n", op->lineno, orig_filename);
if (mask & ~0xff)
{
fprintf (stderr, "Error: variable %s spans bytes: %s\n",
name, op->comment);
errors++;
}
else if (shift && (mask != 0xff))
printf ("%*s int %s ATTRIBUTE_UNUSED = (op[%d] >> %d) & 0x%02x;\n",
level, "", name, byte, shift, mask);
else if (mask != 0xff)
printf ("%*s int %s ATTRIBUTE_UNUSED = op[%d] & 0x%02x;\n",
level, "", name, byte, mask);
else
printf ("%*s int %s ATTRIBUTE_UNUSED = op[%d];\n", level, "", name,
byte);
}
else
i++;
}
if (op->comment)
{
printf ("%*s if (trace) {\n", level, "");
printf ("%*s printf(\"\\033[33m%%s\\033[0m ", level, "");
for (i = 0; i < op->nbytes; i++)
printf (" %%02x");
printf ("\\n\"");
printf (",\n%*s \"%s\"", level, "", op->comment);
for (i = 0; i < op->nbytes; i++)
{
if (i == 0)
printf (",\n%*s op[%d]", level, "", i);
else
printf (", op[%d]", i);
}
printf (");\n");
for (i = 0; i < vn; i++)
printf ("%*s printf(\" %s = 0x%%x%s\", %s);\n", level, "",
varnames[i], (i < vn - 1) ? "," : "\\n", varnames[i]);
printf ("%*s }\n", level, "");
}
printf ("#line %d \"%s\"\n", op->lineno, orig_filename);
for (i = 0; i < op->nlines; i++)
printf ("%*s%s", level, "", op->lines[i]);
if (op->comment)
printf ("%*s}\n", level, "");
}
static void
store_opcode_bits (opcode * op, int byte, Indirect * ind)
{
int bits = op->b[byte].decodable_bits;
do
{
if (!valid_varybits (bits, op, byte))
continue;
switch (ind[bits].type)
{
case T_unused:
if (byte == op->dbytes - 1)
{
ind[bits].type = T_op;
ind[bits].u.op = op;
op->last_ind = ind;
break;
}
else
{
int i2;
ind[bits].type = T_indirect;
ind[bits].u.ind = (Indirect *) malloc (256 * sizeof (Indirect));
for (i2 = 0; i2 < 256; i2++)
ind[bits].u.ind[i2].type = T_unused;
store_opcode_bits (op, byte + 1, ind[bits].u.ind);
}
break;
case T_indirect:
if (byte < op->dbytes - 1)
store_opcode_bits (op, byte + 1, ind[bits].u.ind);
break;
case T_op:
break;
case T_done:
break;
}
}
while ((bits = next_varybits (bits, op, byte)) != 0);
}
static void
emit_indirect (Indirect * ind, int byte)
{
int unsup = 0;
int j, n, mask;
mask = 0;
for (j = 0; j < 256; j++)
{
switch (ind[j].type)
{
case T_indirect:
mask = 0xff;
break;
case T_op:
mask |= ind[j].u.op->b[byte].decodable_mask;
break;
case T_done:
case T_unused:
break;
}
}
printf ("%*s GETBYTE();\n", byte * 6, "");
printf ("%*s switch (op[%d] & 0x%02x) {\n", byte * 6, "", byte, mask);
for (j = 0; j < 256; j++)
if ((j & ~mask) == 0)
{
switch (ind[j].type)
{
case T_done:
break;
case T_unused:
unsup = 1;
break;
case T_op:
for (n = j; n < 256; n++)
if ((n & ~mask) == 0
&& ind[n].type == T_op && ind[n].u.op == ind[j].u.op)
{
ind[n].type = T_done;
printf ("%*s case 0x%02x:\n", byte * 6, "", n);
}
for (n = byte; n < ind[j].u.op->nbytes - 1; n++)
printf ("%*s GETBYTE();\n", byte * 6, "");
dump_lines (ind[j].u.op, byte * 6 + 6, ind);
printf ("%*s break;\n", byte * 6, "");
break;
case T_indirect:
printf ("%*s case 0x%02x:\n", byte * 6, "", j);
emit_indirect (ind[j].u.ind, byte + 1);
printf ("%*s break;\n", byte * 6, "");
break;
}
}
if (unsup)
printf ("%*s default: UNSUPPORTED(); break;\n", byte * 6, "");
printf ("%*s }\n", byte * 6, "");
}
static char *
pv_dup (char *p, char *ep)
{
int n = ep - p;
char *rv = (char *) malloc (n + 1);
memcpy (rv, p, n);
rv[n] = 0;
return rv;
}
static unsigned char
str2mask (char *str, char *ep)
{
unsigned char rv = 0;
while (str < ep)
{
rv *= 2;
if (*str == '1')
rv += 1;
str++;
}
return rv;
}
static void
process_vary (char *line)
{
char *cp, *ep;
Vary *v = (Vary *) malloc (sizeof (Vary));
n_varies++;
if (vary)
vary = (Vary **) realloc (vary, n_varies * sizeof (Vary *));
else
vary = (Vary **) malloc (n_varies * sizeof (Vary *));
vary[n_varies - 1] = v;
cp = line;
for (cp = line; isspace (*cp); cp++);
for (ep = cp; *ep && !isspace (*ep); ep++);
v->name = pv_dup (cp, ep);
v->nlen = strlen (v->name);
v->mask = (1 << v->nlen) - 1;
v->n_patterns = 0;
v->patterns = (unsigned char *) malloc (1);
while (1)
{
for (cp = ep; isspace (*cp); cp++);
if (!isdigit (*cp))
break;
for (ep = cp; *ep && !isspace (*ep); ep++);
v->n_patterns++;
v->patterns = (unsigned char *) realloc (v->patterns, v->n_patterns);
v->patterns[v->n_patterns - 1] = str2mask (cp, ep);
}
}
static int
fieldcmp (opcode * op, int bit, char *name)
{
int n = strlen (name);
if (memcmp (op->id + bit, name, n) == 0
&& (!isalpha (op->id[bit + n]) || op->var_start[bit + n]))
return 1;
return 0;
}
static void
log_indirect (Indirect * ind, int byte)
{
int i, j;
char *last_c = 0;
for (i = 0; i < 256; i++)
{
for (j = 0; j < byte; j++)
fprintf (sim_log, "%s ", prmb (255, cur_bits[j]));
fprintf (sim_log, "%s ", prmb (255, i));
switch (ind[i].type)
{
case T_op:
case T_done:
if (last_c && (ind[i].u.op->comment == last_c))
fprintf (sim_log, "''\n");
else
fprintf (sim_log, "%s\n", ind[i].u.op->comment);
last_c = ind[i].u.op->comment;
break;
case T_unused:
fprintf (sim_log, "unused\n");
break;
case T_indirect:
fprintf (sim_log, "indirect\n");
cur_bits[byte] = i;
log_indirect (ind[i].u.ind, byte + 1);
last_c = 0;
break;
}
}
}
int
main (int argc, char **argv)
{
char *linebuf;
FILE *in;
int lineno = 0;
int i;
size_t len;
if (argc > 2 && strcmp (argv[1], "-l") == 0)
{
sim_log = fopen (argv[2], "w");
argc -= 2;
argv += 2;
}
if (argc < 2)
{
fprintf (stderr, "usage: opc2c infile.opc > outfile.opc\n");
exit (1);
}
orig_filename = argv[1];
in = fopen (argv[1], "r");
if (!in)
{
fprintf (stderr, "Unable to open file %s for reading\n", argv[1]);
perror ("The error was");
exit (1);
}
n_opcodes = 0;
opcodes = (opcode **) malloc (sizeof (opcode *));
op = &prefix_text;
op->lineno = 1;
linebuf = NULL;
len = 0;
while (getline (&linebuf, &len, in) >= 0)
{
char *line = linebuf;
lineno++;
if (strncmp (line, " /** ", 6) == 0
&& (isdigit (line[6]) || memcmp (line + 6, "VARY", 4) == 0))
line += 2;
if (line[0] == '/' && line[1] == '*' && line[2] == '*')
{
if (strncmp (line, "/** */", 6) == 0)
{
op = &suffix_text;
op->lineno = lineno;
}
else if (strncmp (line, "/** VARY ", 9) == 0)
process_vary (line + 9);
else
{
char *lp;
int i, bit, byte;
int var_start = 1;
n_opcodes++;
opcodes =
(opcode **) realloc (opcodes, n_opcodes * sizeof (opcode *));
op = (opcode *) malloc (sizeof (opcode));
opcodes[n_opcodes - 1] = op;
op->nbytes = op->dbytes = 0;
memset (op->id, 0, sizeof (op->id));
memset (op->var_start, 0, sizeof (op->var_start));
for (i = 0; i < MAX_BYTES; i++)
{
op->b[i].decodable_mask = 0;
op->b[i].decodable_bits = 0;
}
op->comment = strdup (line);
op->comment[strlen (op->comment) - 1] = 0;
while (op->comment[0] && isspace (op->comment[0]))
op->comment++;
op->lineno = lineno;
op->nlines = 0;
op->lines = 0;
op->last_ind = 0;
op->semantics_label = 0;
op->nvaries = 0;
op->vary = 0;
i = 0;
for (lp = line + 4; *lp; lp++)
{
bit = 7 - (i & 7);
byte = i >> 3;
if (strncmp (lp, "*/", 2) == 0)
break;
else if ((lp[0] == ' ' && lp[1] == ' ') || (lp[0] == '\t'))
break;
else if (*lp == ' ')
var_start = 1;
else
{
if (*lp == '0' || *lp == '1')
{
op->b[byte].decodable_mask |= 1 << bit;
var_start = 1;
if (op->dbytes < byte + 1)
op->dbytes = byte + 1;
}
else if (var_start)
{
op->var_start[i] = 1;
var_start = 0;
}
if (*lp == '1')
op->b[byte].decodable_bits |= 1 << bit;
op->nbytes = byte + 1;
op->id[i++] = *lp;
}
}
}
}
else
{
op->nlines++;
if (op->lines)
op->lines =
(char **) realloc (op->lines, op->nlines * sizeof (char *));
else
op->lines = (char **) malloc (op->nlines * sizeof (char *));
op->lines[op->nlines - 1] = strdup (line);
}
}
free (linebuf);
{
int i, j;
for (i = 0; i < n_varies; i++)
{
Vary *v = vary[i];
lprintf (sim_log, "V[%s] %d\n", v->name, v->nlen);
for (j = 0; j < v->n_patterns; j++)
lprintf (sim_log, " P %02x\n", v->patterns[j]);
}
}
for (i = n_opcodes - 2; i >= 0; i--)
{
if (opcodes[i]->nlines == 0)
{
opcodes[i]->nlines = opcodes[i + 1]->nlines;
opcodes[i]->lines = opcodes[i + 1]->lines;
}
}
for (i = 0; i < 256; i++)
indirect[i].type = T_unused;
qsort (opcodes, n_opcodes, sizeof (opcodes[0]), op_cmp);
for (i = 0; i < n_opcodes; i++)
{
int j, b, v;
for (j = 0; j < opcodes[i]->nbytes; j++)
lprintf (sim_log, "%s ",
prmb (opcodes[i]->b[j].decodable_mask,
opcodes[i]->b[j].decodable_bits));
lprintf (sim_log, " %s\n", opcodes[i]->comment);
for (j = 0; j < opcodes[i]->nbytes; j++)
{
for (b = 0; b < 8; b++)
if (isalpha (opcodes[i]->id[j * 8 + b]))
for (v = 0; v < n_varies; v++)
if (fieldcmp (opcodes[i], j * 8 + b, vary[v]->name))
{
int nv = opcodes[i]->nvaries++;
if (nv)
opcodes[i]->vary =
(VaryRef *) realloc (opcodes[i]->vary,
(nv + 1) * sizeof (VaryRef));
else
opcodes[i]->vary =
(VaryRef *) malloc ((nv + 1) * sizeof (VaryRef));
opcodes[i]->vary[nv].varyno = v;
opcodes[i]->vary[nv].byte = j;
opcodes[i]->vary[nv].shift = 8 - b - vary[v]->nlen;
lprintf (sim_log, "[vary %s shift %d]\n",
vary[v]->name, opcodes[i]->vary[nv].shift);
}
}
}
for (i = 0; i < n_opcodes; i++)
{
int i2;
int bytes = opcodes[i]->dbytes;
lprintf (sim_log, "\nmask:");
for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_mask);
lprintf (sim_log, "%*s%s\n", 13 - 3 * opcodes[i]->nbytes, "",
opcodes[i]->comment);
lprintf (sim_log, "bits:");
for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_bits);
lprintf (sim_log, "%*s(%s) %d byte%s\n", 13 - 3 * opcodes[i]->nbytes,
"", opcodes[i]->id, bytes, bytes == 1 ? "" : "s");
store_opcode_bits (opcodes[i], 0, indirect);
}
dump_lines (&prefix_text, 0, 0);
emit_indirect (indirect, 0);
dump_lines (&suffix_text, 0, 0);
if (sim_log)
log_indirect (indirect, 0);
return errors;
}