summaryrefslogtreecommitdiff
path: root/nasmlib.c
blob: b4ca34e4f6bbf909352b0b9def90d0bbfa41bc18 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
/* ----------------------------------------------------------------------- *
 *   
 *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
 *   See the file AUTHORS included with the NASM distribution for
 *   the specific copyright holders.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following
 *   conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *     
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ----------------------------------------------------------------------- */

/*
 * nasmlib.c	library routines for the Netwide Assembler
 */

#include "compiler.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <inttypes.h>

#include "nasm.h"
#include "nasmlib.h"
#include "insns.h"

int globalbits = 0;    /* defined in nasm.h, works better here for ASM+DISASM */
static vefunc nasm_verror;	/* Global error handling function */

#ifdef LOGALLOC
static FILE *logfp;
#endif

/* Uninitialized -> all zero by C spec */
const uint8_t zero_buffer[ZERO_BUF_SIZE];

/*
 * Prepare a table of tolower() results.  This avoids function calls
 * on some platforms.
 */

unsigned char nasm_tolower_tab[256];

void tolower_init(void)
{
    int i;

    for (i = 0; i < 256; i++)
	nasm_tolower_tab[i] = tolower(i);
}

void nasm_set_verror(vefunc ve)
{
    nasm_verror = ve;
}

void nasm_error(int severity, const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    nasm_verror(severity, fmt, ap);
    va_end(ap);
}

void nasm_init_malloc_error(void)
{
#ifdef LOGALLOC
    logfp = fopen("malloc.log", "w");
    setvbuf(logfp, NULL, _IOLBF, BUFSIZ);
    fprintf(logfp, "null pointer is %p\n", NULL);
#endif
}

#ifdef LOGALLOC
void *nasm_malloc_log(const char *file, int line, size_t size)
#else
void *nasm_malloc(size_t size)
#endif
{
    void *p = malloc(size);
    if (!p)
        nasm_error(ERR_FATAL | ERR_NOFILE, "out of memory");
#ifdef LOGALLOC
    else
        fprintf(logfp, "%s %d malloc(%ld) returns %p\n",
                file, line, (long)size, p);
#endif
    return p;
}

#ifdef LOGALLOC
void *nasm_zalloc_log(const char *file, int line, size_t size)
#else
void *nasm_zalloc(size_t size)
#endif
{
    void *p = calloc(size, 1);
    if (!p)
        nasm_error(ERR_FATAL | ERR_NOFILE, "out of memory");
#ifdef LOGALLOC
    else
        fprintf(logfp, "%s %d calloc(%ld, 1) returns %p\n",
                file, line, (long)size, p);
#endif
    return p;
}

#ifdef LOGALLOC
void *nasm_realloc_log(const char *file, int line, void *q, size_t size)
#else
void *nasm_realloc(void *q, size_t size)
#endif
{
    void *p = q ? realloc(q, size) : malloc(size);
    if (!p)
        nasm_error(ERR_FATAL | ERR_NOFILE, "out of memory");
#ifdef LOGALLOC
    else if (q)
        fprintf(logfp, "%s %d realloc(%p,%ld) returns %p\n",
                file, line, q, (long)size, p);
    else
        fprintf(logfp, "%s %d malloc(%ld) returns %p\n",
                file, line, (long)size, p);
#endif
    return p;
}

#ifdef LOGALLOC
void nasm_free_log(const char *file, int line, void *q)
#else
void nasm_free(void *q)
#endif
{
    if (q) {
#ifdef LOGALLOC
        fprintf(logfp, "%s %d free(%p)\n", file, line, q);
#endif
        free(q);
    }
}

#ifdef LOGALLOC
char *nasm_strdup_log(const char *file, int line, const char *s)
#else
char *nasm_strdup(const char *s)
#endif
{
    char *p;
    int size = strlen(s) + 1;

    p = malloc(size);
    if (!p)
        nasm_error(ERR_FATAL | ERR_NOFILE, "out of memory");
#ifdef LOGALLOC
    else
        fprintf(logfp, "%s %d strdup(%ld) returns %p\n",
                file, line, (long)size, p);
#endif
    strcpy(p, s);
    return p;
}

#ifdef LOGALLOC
char *nasm_strndup_log(const char *file, int line, const char *s, size_t len)
#else
char *nasm_strndup(const char *s, size_t len)
#endif
{
    char *p;
    int size = len + 1;

    p = malloc(size);
    if (!p)
        nasm_error(ERR_FATAL | ERR_NOFILE, "out of memory");
#ifdef LOGALLOC
    else
        fprintf(logfp, "%s %d strndup(%ld) returns %p\n",
                file, line, (long)size, p);
#endif
    strncpy(p, s, len);
    p[len] = '\0';
    return p;
}

no_return nasm_assert_failed(const char *file, int line, const char *msg)
{
    nasm_error(ERR_FATAL, "assertion %s failed at %s:%d", msg, file, line);
    exit(1);
}

#ifndef nasm_stricmp
int nasm_stricmp(const char *s1, const char *s2)
{
    unsigned char c1, c2;
    int d;

    while (1) {
	c1 = nasm_tolower(*s1++);
	c2 = nasm_tolower(*s2++);
	d = c1-c2;

	if (d)
	    return d;
	if (!c1)
	    break;
    }
    return 0;
}
#endif

#ifndef nasm_strnicmp
int nasm_strnicmp(const char *s1, const char *s2, size_t n)
{
    unsigned char c1, c2;
    int d;

    while (n--) {
	c1 = nasm_tolower(*s1++);
	c2 = nasm_tolower(*s2++);
	d = c1-c2;

	if (d)
	    return d;
	if (!c1)
	    break;
    }
    return 0;
}
#endif

int nasm_memicmp(const char *s1, const char *s2, size_t n)
{
    unsigned char c1, c2;
    int d;

    while (n--) {
	c1 = nasm_tolower(*s1++);
	c2 = nasm_tolower(*s2++);
	d = c1-c2;
	if (d)
	    return d;
    }
    return 0;
}

#ifndef nasm_strsep
char *nasm_strsep(char **stringp, const char *delim)
{
        char *s = *stringp;
        char *e;

        if (!s)
                return NULL;

        e = strpbrk(s, delim);
        if (e)
                *e++ = '\0';

        *stringp = e;
        return s;
}
#endif


#define lib_isnumchar(c)   (nasm_isalnum(c) || (c) == '$' || (c) == '_')
#define numvalue(c)  ((c)>='a' ? (c)-'a'+10 : (c)>='A' ? (c)-'A'+10 : (c)-'0')

static int radix_letter(char c)
{
    switch (c) {
    case 'b': case 'B':
    case 'y': case 'Y':
	return 2;		/* Binary */
    case 'o': case 'O':
    case 'q': case 'Q':
	return 8;		/* Octal */
    case 'h': case 'H':
    case 'x': case 'X':
	return 16;		/* Hexadecimal */
    case 'd': case 'D':
    case 't': case 'T':
	return 10;		/* Decimal */
    default:
	return 0;		/* Not a known radix letter */
    }
}

int64_t readnum(char *str, bool *error)
{
    char *r = str, *q;
    int32_t pradix, sradix, radix;
    int plen, slen, len;
    uint64_t result, checklimit;
    int digit, last;
    bool warn = false;
    int sign = 1;

    *error = false;

    while (nasm_isspace(*r))
        r++;                    /* find start of number */

    /*
     * If the number came from make_tok_num (as a result of an %assign), it
     * might have a '-' built into it (rather than in a preceeding token).
     */
    if (*r == '-') {
        r++;
        sign = -1;
    }

    q = r;

    while (lib_isnumchar(*q))
        q++;                    /* find end of number */

    len = q-r;
    if (!len) {
	/* Not numeric */
	*error = true;
	return 0;
    }

    /*
     * Handle radix formats:
     *
     * 0<radix-letter><string>
     * $<string>		(hexadecimal)
     * <string><radix-letter>
     */
    pradix = sradix = 0;
    plen = slen = 0;

    if (len > 2 && *r == '0' && (pradix = radix_letter(r[1])) != 0)
	plen = 2;
    else if (len > 1 && *r == '$')
	pradix = 16, plen = 1;

    if (len > 1 && (sradix = radix_letter(q[-1])) != 0)
	slen = 1;

    if (pradix > sradix) {
	radix = pradix;
	r += plen;
    } else if (sradix > pradix) {
	radix = sradix;
	q -= slen;
    } else {
	/* Either decimal, or invalid -- if invalid, we'll trip up
	   further down. */
	radix = 10;
    }

    /*
     * `checklimit' must be 2**64 / radix. We can't do that in
     * 64-bit arithmetic, which we're (probably) using, so we
     * cheat: since we know that all radices we use are even, we
     * can divide 2**63 by radix/2 instead.
     */
    checklimit = 0x8000000000000000ULL / (radix >> 1);

    /*
     * Calculate the highest allowable value for the last digit of a
     * 64-bit constant... in radix 10, it is 6, otherwise it is 0
     */
    last = (radix == 10 ? 6 : 0);

    result = 0;
    while (*r && r < q) {
	if (*r != '_') {
	    if (*r < '0' || (*r > '9' && *r < 'A')
		|| (digit = numvalue(*r)) >= radix) {
		*error = true;
		return 0;
	    }
	    if (result > checklimit ||
		(result == checklimit && digit >= last)) {
		warn = true;
	    }

	    result = radix * result + digit;
	}
        r++;
    }

    if (warn)
        nasm_error(ERR_WARNING | ERR_PASS1 | ERR_WARN_NOV,
		   "numeric constant %s does not fit in 64 bits",
		   str);

    return result * sign;
}

int64_t readstrnum(char *str, int length, bool *warn)
{
    int64_t charconst = 0;
    int i;

    *warn = false;

    str += length;
    if (globalbits == 64) {
        for (i = 0; i < length; i++) {
            if (charconst & 0xFF00000000000000ULL)
                *warn = true;
            charconst = (charconst << 8) + (uint8_t)*--str;
        }
    } else {
        for (i = 0; i < length; i++) {
            if (charconst & 0xFF000000UL)
                *warn = true;
            charconst = (charconst << 8) + (uint8_t)*--str;
        }
    }
    return charconst;
}

static int32_t next_seg;

void seg_init(void)
{
    next_seg = 0;
}

int32_t seg_alloc(void)
{
    return (next_seg += 2) - 2;
}

#ifdef WORDS_LITTLEENDIAN

void fwriteint16_t(uint16_t data, FILE * fp)
{
    fwrite(&data, 1, 2, fp);
}

void fwriteint32_t(uint32_t data, FILE * fp)
{
    fwrite(&data, 1, 4, fp);
}

void fwriteint64_t(uint64_t data, FILE * fp)
{
    fwrite(&data, 1, 8, fp);
}

void fwriteaddr(uint64_t data, int size, FILE * fp)
{
    fwrite(&data, 1, size, fp);
}

#else /* not WORDS_LITTLEENDIAN */

void fwriteint16_t(uint16_t data, FILE * fp)
{
    char buffer[2], *p = buffer;
    WRITESHORT(p, data);
    fwrite(buffer, 1, 2, fp);
}

void fwriteint32_t(uint32_t data, FILE * fp)
{
    char buffer[4], *p = buffer;
    WRITELONG(p, data);
    fwrite(buffer, 1, 4, fp);
}

void fwriteint64_t(uint64_t data, FILE * fp)
{
    char buffer[8], *p = buffer;
    WRITEDLONG(p, data);
    fwrite(buffer, 1, 8, fp);
}

void fwriteaddr(uint64_t data, int size, FILE * fp)
{
    char buffer[8], *p = buffer;
    WRITEADDR(p, data, size);
    fwrite(buffer, 1, size, fp);
}

#endif

size_t fwritezero(size_t bytes, FILE *fp)
{
    size_t count = 0;
    size_t blksize;
    size_t rv;

    while (bytes) {
	blksize = (bytes < ZERO_BUF_SIZE) ? bytes : ZERO_BUF_SIZE;

	rv = fwrite(zero_buffer, 1, blksize, fp);
	if (!rv)
	    break;

	count += rv;
	bytes -= rv;
    }

    return count;
}

void standard_extension(char *inname, char *outname, char *extension)
{
    char *p, *q;

    if (*outname)               /* file name already exists, */
        return;                 /* so do nothing */
    q = inname;
    p = outname;
    while (*q)
        *p++ = *q++;            /* copy, and find end of string */
    *p = '\0';                  /* terminate it */
    while (p > outname && *--p != '.') ;        /* find final period (or whatever) */
    if (*p != '.')
        while (*p)
            p++;                /* go back to end if none found */
    if (!strcmp(p, extension)) {        /* is the extension already there? */
        if (*extension)
            nasm_error(ERR_WARNING | ERR_NOFILE,
		       "file name already ends in `%s': "
		       "output will be in `nasm.out'", extension);
        else
            nasm_error(ERR_WARNING | ERR_NOFILE,
		       "file name already has no extension: "
		       "output will be in `nasm.out'");
        strcpy(outname, "nasm.out");
    } else
        strcpy(p, extension);
}

/*
 * Common list of prefix names
 */
static const char *prefix_names[] = {
    "a16", "a32", "a64", "asp", "lock", "o16", "o32", "o64", "osp",
    "rep", "repe", "repne", "repnz", "repz", "times", "wait"
};

const char *prefix_name(int token)
{
    unsigned int prefix = token-PREFIX_ENUM_START;
    if (prefix > elements(prefix_names))
	return NULL;

    return prefix_names[prefix];
}

/*
 * Binary search.
 */
int bsi(const char *string, const char **array, int size)
{
    int i = -1, j = size;       /* always, i < index < j */
    while (j - i >= 2) {
        int k = (i + j) / 2;
        int l = strcmp(string, array[k]);
        if (l < 0)              /* it's in the first half */
            j = k;
        else if (l > 0)         /* it's in the second half */
            i = k;
        else                    /* we've got it :) */
            return k;
    }
    return -1;                  /* we haven't got it :( */
}

int bsii(const char *string, const char **array, int size)
{
    int i = -1, j = size;       /* always, i < index < j */
    while (j - i >= 2) {
        int k = (i + j) / 2;
        int l = nasm_stricmp(string, array[k]);
        if (l < 0)              /* it's in the first half */
            j = k;
        else if (l > 0)         /* it's in the second half */
            i = k;
        else                    /* we've got it :) */
            return k;
    }
    return -1;                  /* we haven't got it :( */
}

static char *file_name = NULL;
static int32_t line_number = 0;

char *src_set_fname(char *newname)
{
    char *oldname = file_name;
    file_name = newname;
    return oldname;
}

int32_t src_set_linnum(int32_t newline)
{
    int32_t oldline = line_number;
    line_number = newline;
    return oldline;
}

int32_t src_get_linnum(void)
{
    return line_number;
}

int src_get(int32_t *xline, char **xname)
{
    if (!file_name || !*xname || strcmp(*xname, file_name)) {
        nasm_free(*xname);
        *xname = file_name ? nasm_strdup(file_name) : NULL;
        *xline = line_number;
        return -2;
    }
    if (*xline != line_number) {
        int32_t tmp = line_number - *xline;
        *xline = line_number;
        return tmp;
    }
    return 0;
}

char *nasm_strcat(const char *one, const char *two)
{
    char *rslt;
    int l1 = strlen(one);
    rslt = nasm_malloc(l1 + strlen(two) + 1);
    strcpy(rslt, one);
    strcpy(rslt + l1, two);
    return rslt;
}

/* skip leading spaces */
char *nasm_skip_spaces(const char *p)
{
    if (p)
        while (*p && nasm_isspace(*p))
            p++;
    return (char *)p;
}

/* skip leading non-spaces */
char *nasm_skip_word(const char *p)
{
    if (p)
        while (*p && !nasm_isspace(*p))
            p++;
    return (char *)p;
}

/* zap leading spaces with zero */
char *nasm_zap_spaces_fwd(char *p)
{
    if (p)
        while (*p && nasm_isspace(*p))
            *p++ = 0x0;
    return p;
}

/* zap spaces with zero in reverse order */
char *nasm_zap_spaces_rev(char *p)
{
    if (p)
        while (*p && nasm_isspace(*p))
            *p-- = 0x0;
    return p;
}

/*
 * initialized data bytes length from opcode
 */
int idata_bytes(int opcode)
{
    int ret;
    switch (opcode) {
    case I_DB:
        ret = 1;
        break;
    case I_DW:
        ret = 2;
        break;
    case I_DD:
        ret = 4;
        break;
    case I_DQ:
        ret = 8;
        break;
    case I_DT:
        ret = 10;
        break;
    case I_DO:
        ret = 16;
        break;
    case I_DY:
        ret = 32;
        break;
    case I_none:
        ret = -1;
        break;
    default:
        ret = 0;
        break;
    }
    return ret;
}