summaryrefslogtreecommitdiff
path: root/hw/xfree86/loader/aoutloader.c
blob: 941ede83ba81582fe35459ce91b9aa8d12adf362 (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
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
/* $XFree86$ */

/*
 *
 * Copyright (c) 1997 Matthieu Herrb
 * Copyright 1995-1998 Metro Link, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Metro Link, Inc. not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Metro Link, Inc. makes no
 * representations about the suitability of this software for any purpose.
 *  It is provided "as is" without express or implied warranty.
 *
 * METRO LINK, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL METRO LINK, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 * Modified 21/02/97 by Sebastien Marineau to support OS/2 a.out objects
 */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef __QNX__
#include <fcntl.h>
#else
#include <sys/fcntl.h>
#endif
#include <sys/stat.h>
#include <netinet/in.h>

#ifdef DBMALLOC
#include <debug/malloc.h>
#define Xalloc(size) malloc(size)
#define Xcalloc(size) calloc(1,(size))
#define Xfree(size) free(size)
#endif

#include "Xos.h"
#include "os.h"
#include "aout.h"

#include "sym.h"
#include "loader.h"
#include "aoutloader.h"

#ifndef LOADERDEBUG
#define LOADERDEBUG 0
#endif

#if LOADERDEBUG
#define AOUTDEBUG ErrorF
#endif

#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif

/*
 * This structure contains all of the information about a module
 * that has been loaded.
 */

typedef struct {
    int handle;
    int module;
    int fd;
    loader_funcs *funcs;
    AOUTHDR *header;		/* file header */
    unsigned char *text;	/* Start address of the text section */
    unsigned int textsize;	/* Size of the text section */
    unsigned char *data;	/* Start address of the data section */
    unsigned int datasize;	/* Size of the data section */
    unsigned char *bss;		/* Start address of the bss data */
    unsigned int bsssize;	/* Size of the bss section */
    struct relocation_info *txtrel;	/* Start address of the text relocation table */
    struct relocation_info *datarel;	/* Start address of the data relocation table */
    AOUT_nlist *symtab;		/* Start address of the symbol table */
    unsigned char *strings;	/* Start address of the string table */
    unsigned long strsize;	/* size of string table */
    unsigned char *common;	/* Start address of the common data */
    unsigned long comsize;	/* size of common data */
} AOUTModuleRec, *AOUTModulePtr;

/*
 * If an relocation is unable to be satisfied, then put it on a list
 * to try later after more modules have been loaded.
 */
typedef struct AOUT_RELOC {
    AOUTModulePtr file;
    struct relocation_info *rel;
    int type;			/* AOUT_TEXT or AOUT_DATA */
    struct AOUT_RELOC *next;
} AOUTRelocRec;

/*
 * Symbols with a section number of 0 (N_UNDF) but a value of non-zero
 * need to have space allocated for them.
 *
 * Gather all of these symbols together, and allocate one chunk when we
 * are done.
 */

typedef struct AOUT_COMMON {
    struct AOUT_nlist *sym;
    int index;
    struct AOUT_COMMON *next;
} AOUTCommonRec;

static AOUTCommonPtr listCOMMON = NULL;

/* prototypes for static functions */
static int AOUTHashCleanOut(void *, itemPtr);
static char *AOUTGetSymbolName(AOUTModulePtr, struct AOUT_nlist *);
static void *AOUTGetSymbolValue(AOUTModulePtr, int);
static AOUTCommonPtr AOUTAddCommon(struct AOUT_nlist *, int);
static LOOKUP *AOUTCreateCommon(AOUTModulePtr);
static LOOKUP *AOUT_GetSymbols(AOUTModulePtr);
static AOUTRelocPtr AOUTDelayRelocation(AOUTModulePtr, int,
					struct relocation_info_i386 *);
static AOUTRelocPtr AOUTCollectRelocations(AOUTModulePtr);
static void AOUT_Relocate(unsigned long *, unsigned long, int);
static AOUTRelocPtr AOUT_RelocateEntry(AOUTModulePtr, int,
				       struct relocation_info_i386 *);

/*
 * Return 1 if the symbol in item belongs to aoutfile
 */
static int
AOUTHashCleanOut(void *voidptr, itemPtr item)
{
    AOUTModulePtr aoutfile = (AOUTModulePtr) voidptr;

    return (aoutfile->handle == item->handle);
}

/*
 * Manage listResolv 
 */
static AOUTRelocPtr
AOUTDelayRelocation(AOUTModulePtr aoutfile, int type,
		    struct relocation_info *rel)
{
    AOUTRelocPtr reloc;

    if ((reloc = xf86loadermalloc(sizeof(AOUTRelocRec))) == NULL) {
	ErrorF("AOUTDelayRelocation() Unable to allocate memory\n");
	return NULL;
    }
    if ((unsigned long)rel < 0x200) {
	ErrorF("bug");
    }
    reloc->file = aoutfile;
    reloc->type = type;
    reloc->rel = rel;
    reloc->next = 0;
    return reloc;
}

/*
 * Manage listCOMMON
 */

static AOUTCommonPtr
AOUTAddCommon(struct AOUT_nlist *sym, int index)
{
    AOUTCommonPtr common;

    if ((common = xf86loadermalloc(sizeof(AOUTCommonRec))) == NULL) {
	ErrorF("AOUTAddCommon() Unable to allocate memory\n");
	return 0;
    }
    common->sym = sym;
    common->index = index;
    common->next = 0;
    return common;
}

static LOOKUP *
AOUTCreateCommon(AOUTModulePtr aoutfile)
{
    int numsyms = 0, size = 0, l = 0;
    int offset = 0;
    AOUTCommonPtr common;
    LOOKUP *lookup;

    if (listCOMMON == NULL)
	return NULL;

    common = listCOMMON;
    for (common = listCOMMON; common; common = common->next) {
	/* Ensure long word alignment */
	if ((common->sym->n_value & (sizeof(long) - 1)) != 0)
	    common->sym->n_value = (common->sym->n_value + (sizeof(long) - 1))
		    & ~(sizeof(long) - 1);

	/* accumulate the sizes */
	size += common->sym->n_value;
	numsyms++;
    }				/* while */

#ifdef AOUTDEBUG
    AOUTDEBUG("AOUTCreateCommon() %d entries (%d bytes) of COMMON data\n",
	      numsyms, size);
#endif

    if ((lookup = xf86loadermalloc((numsyms + 1) * sizeof(LOOKUP))) == NULL) {
	ErrorF("AOUTCreateCommon() Unable to allocate memory\n");
	return NULL;
    }

    aoutfile->comsize = size;
    if ((aoutfile->common = xf86loadercalloc(1, size)) == NULL) {
	ErrorF("AOUTCreateCommon() Unable to allocate memory\n");
	return NULL;
    }

    while (listCOMMON) {
	common = listCOMMON;
	lookup[l].symName = AOUTGetSymbolName(aoutfile, common->sym);
	lookup[l].offset = (funcptr) (aoutfile->common + offset);
#ifdef AOUTDEBUG
	AOUTDEBUG("Adding %p %s\n", (void *)lookup[l].offset,
		  lookup[l].symName);
#endif
	listCOMMON = common->next;
	offset += common->sym->n_value;
	xf86loaderfree(common);
	l++;
    }				/* while */
    /* listCOMMON == NULL */

    lookup[l].symName = NULL;	/* Terminate the list */
    return lookup;
}

/*
 * Symbol Table
 */

static char *
AOUTGetString(AOUTModulePtr aoutfile, int index)
{
    char *symname = (char *)&(aoutfile->strings[index]);

    if (symname[0] == '_') {
	symname++;
    }

    return symname;
}

/*
 * Return the name of a symbol 
 */
static char *
AOUTGetSymbolName(AOUTModulePtr aoutfile, struct AOUT_nlist *sym)
{
    char *symname = AOUTGetString(aoutfile, sym->n_un.n_strx);
    char *name;

    name = xf86loadermalloc(strlen(symname) + 1);
    if (!name)
	FatalError("AOUTGetSymbolName: Out of memory\n");

    strcpy(name, symname);

    return name;
}

/*
 * Return the value of a symbol in the loader's symbol table
 */
static void *
AOUTGetSymbolValue(AOUTModulePtr aoutfile, int index)
{
    void *symval = NULL;	/* value of the indicated symbol */
    itemPtr symbol = NULL;	/* name/value of symbol */
    char *name = NULL;

    name = AOUTGetSymbolName(aoutfile, aoutfile->symtab + index);

    if (name)
	symbol = LoaderHashFind(name);

    if (symbol)
	symval = (unsigned char *)symbol->address;

    xf86loaderfree(name);
    return symval;
}

/*
 * Perform the actual relocation 
 */
static void
AOUT_Relocate(unsigned long *destl, unsigned long val, int pcrel)
{
#ifdef AOUTDEBUG
    AOUTDEBUG("AOUT_Relocate %p : %08lx %s",
	      (void *)destl, *destl, pcrel == 1 ? "rel" : "abs");

#endif
    if (pcrel) {
	/* relative to PC */
	*destl = val - ((unsigned long)destl + sizeof(long));
    } else {
	*destl += val;
    }
#ifdef AOUTDEBUG
    AOUTDEBUG(" -> %08lx\n", *destl);
#endif
}

/*
 * Fix the relocation for text or data section
 */
static AOUTRelocPtr
AOUT_RelocateEntry(AOUTModulePtr aoutfile, int type,
		   struct relocation_info *rel)
{
    AOUTHDR *header = aoutfile->header;
    AOUT_nlist *symtab = aoutfile->symtab;
    int symnum;
    void *symval;
    unsigned long *destl;	/* address of the location to be modified */

    symnum = rel->r_symbolnum;
#ifdef AOUTDEBUG
    {
	char *name;

	if (rel->r_extern) {
	    AOUTDEBUG("AOUT_RelocateEntry: extern %s\n",
		      name = AOUTGetSymbolName(aoutfile, symtab + symnum));
	    xf86loaderfree(name);
	} else {
	    AOUTDEBUG("AOUT_RelocateEntry: intern\n");
	}
	AOUTDEBUG("  pcrel: %d", rel->r_pcrel);
	AOUTDEBUG("  length: %d", rel->r_length);
	AOUTDEBUG("  baserel: %d", rel->r_baserel);
	AOUTDEBUG("  jmptable: %d", rel->r_jmptable);
	AOUTDEBUG("  relative: %d", rel->r_relative);
	AOUTDEBUG("  copy: %d\n", rel->r_copy);
    }
#endif /* AOUTDEBUG */

    if (rel->r_length != 2) {
	ErrorF("AOUT_ReloateEntry: length != 2\n");
    }
    /* 
     * First find the address to modify
     */
    switch (type) {
    case AOUT_TEXT:
	/* Check that the relocation offset is in the text segment */
	if (rel->r_address > header->a_text) {
	    ErrorF("AOUT_RelocateEntry(): "
		   "text relocation out of text section\n");
	}
	destl = (unsigned long *)(aoutfile->text + rel->r_address);
	break;
    case AOUT_DATA:
	/* Check that the relocation offset is in the data segment */
	if (rel->r_address > header->a_data) {
	    ErrorF("AOUT_RelocateEntry():"
		   "data relocation out of data section\n");
	}
	destl = (unsigned long *)(aoutfile->data + rel->r_address);
	break;
    default:
	ErrorF("AOUT_RelocateEntry(): unknown section type %d\n", type);
	return 0;
    }				/* switch */

    /*
     * Now handle the relocation 
     */
    if (rel->r_extern) {
	/* Lookup the symbol in the loader's symbol table */
	symval = AOUTGetSymbolValue(aoutfile, symnum);
	if (symval != 0) {
	    /* we've got the value */
	    AOUT_Relocate(destl, (unsigned long)symval, rel->r_pcrel);
	    return 0;
	} else {
	    /* The symbol should be undefined */
	    switch (symtab[symnum].n_type & AOUT_TYPE) {
	    case AOUT_UNDF:
#ifdef AOUTDEBUG
		AOUTDEBUG("  extern AOUT_UNDEF\n");
#endif
		/* Add this relocation back to the global list */
		return AOUTDelayRelocation(aoutfile, type, rel);

	    default:
		ErrorF("AOUT_RelocateEntry():"
		       " impossible intern relocation type: %d\n",
		       symtab[symnum].n_type);
		return 0;
	    }			/* switch */
	}
    } else {
	/* intern */
	switch (rel->r_symbolnum) {
	case AOUT_TEXT:
#ifdef AOUTDEBUG
	    AOUTDEBUG("  AOUT_TEXT\n");
#endif
	    /* Only absolute intern text relocations need to be handled */
	    if (rel->r_pcrel == 0)
		AOUT_Relocate(destl, (unsigned long)aoutfile->text,
			      rel->r_pcrel);
	    return 0;
	case AOUT_DATA:
#ifdef AOUTDEBUG
	    AOUTDEBUG("  AOUT_DATA\n");
#endif
	    if (rel->r_pcrel == 0)
		AOUT_Relocate(destl, (unsigned long)aoutfile->data
			      - header->a_text, rel->r_pcrel);
	    else
		ErrorF("AOUT_RelocateEntry(): "
		       "don't know how to handle data pc-relative reloc\n");

	    return 0;
	case AOUT_BSS:
#ifdef AOUTDEBUG
	    AOUTDEBUG("  AOUT_BSS\n");
#endif
	    if (rel->r_pcrel == 0)
		AOUT_Relocate(destl, (unsigned long)aoutfile->bss
			      - header->a_text - header->a_data,
			      rel->r_pcrel);
	    else
		ErrorF("AOUT_RelocateEntry(): "
		       "don't know how to handle bss pc-relative reloc\n");

	    return 0;
	default:
	    ErrorF("AOUT_RelocateEntry():"
		   " unknown intern relocation type: %d\n", rel->r_symbolnum);
	    return 0;
	}			/* switch */
    }
}				/* AOUT_RelocateEntry */

static AOUTRelocPtr
AOUTCollectRelocations(AOUTModulePtr aoutfile)
{
    AOUTHDR *header = aoutfile->header;
    int i, nreloc;
    struct relocation_info *rel;
    AOUTRelocPtr reloc_head = NULL;
    AOUTRelocPtr tmp;

    /* Text relocations */
    if (aoutfile->text != NULL && aoutfile->txtrel != NULL) {
	nreloc = header->a_trsize / sizeof(struct relocation_info);

	for (i = 0; i < nreloc; i++) {
	    rel = aoutfile->txtrel + i;
	    tmp = AOUTDelayRelocation(aoutfile, AOUT_TEXT, rel);
	    if (tmp) {
		tmp->next = reloc_head;
		reloc_head = tmp;
	    }
	}			/* for */
    }
    /* Data relocations */
    if (aoutfile->data != NULL && aoutfile->datarel != NULL) {
	nreloc = header->a_drsize / sizeof(struct relocation_info);

	for (i = 0; i < nreloc; i++) {
	    rel = aoutfile->datarel + i;
	    tmp = AOUTDelayRelocation(aoutfile, AOUT_DATA, rel);
	    tmp->next = reloc_head;
	    reloc_head = tmp;
	}			/* for */
    }
    return reloc_head;
}				/* AOUTCollectRelocations */

/*
 * AOUT_GetSymbols()
 * 
 * add the symbols to the loader's symbol table
 */
static LOOKUP *
AOUT_GetSymbols(AOUTModulePtr aoutfile)
{
    int fd = aoutfile->fd;
    AOUTHDR *header = aoutfile->header;
    int nsyms, soff, i, l;
    char *symname;
    AOUT_nlist *s;
    LOOKUP *lookup, *lookup_common;
    AOUTCommonPtr tmp;

    aoutfile->symtab = (AOUT_nlist *) _LoaderFileToMem(fd,
						       AOUT_SYMOFF(header),
						       header->a_syms,
						       "symbols");
    nsyms = header->a_syms / sizeof(AOUT_nlist);
    lookup = xf86loadermalloc(nsyms * sizeof(LOOKUP));
    if (lookup == NULL) {
	ErrorF("AOUT_GetSymbols(): can't allocate memory\n");
	return NULL;
    }
    for (i = 0, l = 0; i < nsyms; i++) {
	s = aoutfile->symtab + i;
	soff = s->n_un.n_strx;
	if (soff == 0 || (s->n_type & AOUT_STAB) != 0)
	    continue;
	symname = AOUTGetSymbolName(aoutfile, s);
#ifdef AOUTDEBUG
	AOUTDEBUG("AOUT_GetSymbols(): %s %02x %02x %08lx\n",
		  symname, s->n_type, s->n_other, s->n_value);
#endif
	switch (s->n_type & AOUT_TYPE) {
	case AOUT_UNDF:
	    if (s->n_value != 0) {
		if (!LoaderHashFind(symname)) {
#ifdef AOUTDEBUG
		    AOUTDEBUG("Adding common %s\n", symname);
#endif
		    tmp = AOUTAddCommon(s, i);
		    if (tmp) {
			tmp->next = listCOMMON;
			listCOMMON = tmp;
		    }
		}
	    } else {
#ifdef AOUTDEBUG
		AOUTDEBUG("Adding undef %s\n", symname);
#endif
	    }
	    xf86loaderfree(symname);
	    break;
	case AOUT_TEXT:
	    if (s->n_type & AOUT_EXT) {
		lookup[l].symName = symname;
		/* text symbols start at 0 */
		lookup[l].offset = (funcptr) (aoutfile->text + s->n_value);
#ifdef AOUTDEBUG
		AOUTDEBUG("Adding text %s %p\n", symname,
			  (void *)lookup[l].offset);
#endif
		l++;
	    } else {
		xf86loaderfree(symname);
	    }
	    break;
	case AOUT_DATA:
	    if (s->n_type & AOUT_EXT) {
		lookup[l].symName = symname;
		/* data symbols are following text */
		lookup[l].offset = (funcptr) (aoutfile->data +
					      s->n_value - header->a_text);
#ifdef AOUTDEBUG
		AOUTDEBUG("Adding data %s %p\n", symname,
			  (void *)lookup[l].offset);
#endif
		l++;
	    } else {
		xf86loaderfree(symname);
	    }
	    break;
	case AOUT_BSS:
	    if (s->n_type & AOUT_EXT) {
		lookup[l].symName = symname;
		/* bss symbols follow both text and data */
		lookup[l].offset = (funcptr) (aoutfile->bss + s->n_value
					      - (header->a_data
						 + header->a_text));
#ifdef AOUTDEBUG
		AOUTDEBUG("Adding bss %s %p\n", symname,
			  (void *)lookup[l].offset);
#endif
		l++;
	    } else {
		xf86loaderfree(symname);
	    }
	    break;
	case AOUT_FN:
#ifdef AOUTDEBUG
	    if (s->n_type & AOUT_EXT) {
		AOUTDEBUG("Ignoring AOUT_FN %s\n", symname);
	    } else {
		AOUTDEBUG("Ignoring AOUT_WARN %s\n", symname);
	    }
#endif
	    xf86loaderfree(symname);
	    break;
	default:
	    ErrorF("Unknown symbol type %x\n", s->n_type & AOUT_TYPE);
	    xf86loaderfree(symname);
	}			/* switch */
    }				/* for */
    lookup[l].symName = NULL;

    lookup_common = AOUTCreateCommon(aoutfile);
    if (lookup_common) {
	LOOKUP *p;

	for (i = 0, p = lookup_common; p->symName; i++, p++) ;
	memcpy(&(lookup[l]), lookup_common, i * sizeof(LOOKUP));

	xf86loaderfree(lookup_common);
	l += i;
	lookup[l].symName = NULL;
    }
    return lookup;
}				/* AOUT_GetSymbols */

/*
 * Public API for the a.out implementation of the loader
 */
void *
AOUTLoadModule(loaderPtr modrec, int aoutfd, LOOKUP ** ppLookup)
{
    AOUTModulePtr aoutfile = NULL;
    AOUTHDR *header;
    AOUTRelocPtr reloc, tail;
    void *v;

#ifdef AOUTDEBUG
    AOUTDEBUG("AOUTLoadModule(%s, %d, %d)\n",
	      modrec->name, modrec->handle, aoutfd);
#endif
    if ((aoutfile = xf86loadercalloc(1, sizeof(AOUTModuleRec))) == NULL) {
	ErrorF("Unable to allocate AOUTModuleRec\n");
	return NULL;
    }

    aoutfile->handle = modrec->handle;
    aoutfile->module = modrec->module;
    aoutfile->fd = aoutfd;
    v = aoutfile->funcs = modrec->funcs;

    /*
     *  Get the a.out header
     */
    aoutfile->header =
	    (AOUTHDR *) _LoaderFileToMem(aoutfd, 0, sizeof(AOUTHDR),
					 "header");
    header = (AOUTHDR *) aoutfile->header;

    /* 
     * Load the 6 other sections 
     */
    /* text */
    if (header->a_text != 0) {
	aoutfile->text = _LoaderFileToMem(aoutfile->fd,
					  AOUT_TXTOFF(header),
					  header->a_text, "text");
	aoutfile->textsize = header->a_text;
    } else {
	aoutfile->text = NULL;
    }
    /* data */
    if (header->a_data != 0) {
	aoutfile->data = _LoaderFileToMem(aoutfile->fd,
					  AOUT_DATOFF(header),
					  header->a_data, "data");
	aoutfile->datasize = header->a_data;
    } else {
	aoutfile->data = NULL;
    }
    /* bss */
    if (header->a_bss != 0) {
	aoutfile->bss = xf86loadercalloc(1, header->a_bss);
	aoutfile->bsssize = header->a_bss;
    } else {
	aoutfile->bss = NULL;
    }
    /* Text Relocations */
    if (header->a_trsize != 0) {
	aoutfile->txtrel = _LoaderFileToMem(aoutfile->fd,
					    AOUT_TRELOFF(header),
					    header->a_trsize, "txtrel");
    } else {
	aoutfile->txtrel = NULL;
    }
    /* Data Relocations */
    if (header->a_drsize != 0) {
	aoutfile->datarel = _LoaderFileToMem(aoutfile->fd,
					     AOUT_DRELOFF(header),
					     header->a_drsize, "datarel");
    } else {
	aoutfile->datarel = NULL;
    }
    /* String table */
    _LoaderFileRead(aoutfile->fd, AOUT_STROFF(header),
		    &(aoutfile->strsize), sizeof(int));
    if (aoutfile->strsize != 0) {
	aoutfile->strings = _LoaderFileToMem(aoutfile->fd,
					     AOUT_STROFF(header),
					     aoutfile->strsize, "strings");
    } else {
	aoutfile->strings = NULL;
    }
    /* load symbol table */
    *ppLookup = AOUT_GetSymbols(aoutfile);

    /* Do relocations */
    reloc = AOUTCollectRelocations(aoutfile);

    if (reloc) {
	for (tail = reloc; tail->next; tail = tail->next) ;
	tail->next = _LoaderGetRelocations(v)->aout_reloc;
	_LoaderGetRelocations(v)->aout_reloc = reloc;
    }

    return (void *)aoutfile;
}

void
AOUTResolveSymbols(void *mod)
{
    AOUTRelocPtr newlist, p, tmp;

#ifdef AOUTDEBUG
    AOUTDEBUG("AOUTResolveSymbols()\n");
#endif

    newlist = 0;
    for (p = _LoaderGetRelocations(mod)->aout_reloc; p;) {
	tmp = AOUT_RelocateEntry(p->file, p->type, p->rel);
	if (tmp) {
	    /* Failed to relocate.  Keep it in the list. */
	    tmp->next = newlist;
	    newlist = tmp;
	}
	tmp = p;
	p = p->next;
	xf86loaderfree(tmp);
    }
    _LoaderGetRelocations(mod)->aout_reloc = newlist;
}				/* AOUTResolveSymbols */

int
AOUTCheckForUnresolved(void *mod)
{
    int symnum;
    AOUTRelocPtr crel;
    char *name;
    int fatalsym = 0, flag;

#ifdef AOUTDEBUG
    AOUTDEBUG("AOUTCheckForUnResolved()\n");
#endif
    if ((crel = _LoaderGetRelocations(mod)->aout_reloc) == NULL)
	return 0;

    while (crel) {
	if (crel->type == AOUT_TEXT) {
	    /* Attempt to make unresolved  text references 
	     * point to a default function */
	    AOUT_Relocate((unsigned long *)(crel->file->text
					    + crel->rel->r_address),
			  (unsigned long)LoaderDefaultFunc,
			  crel->rel->r_pcrel);
	}
	symnum = crel->rel->r_symbolnum;
	name = AOUTGetSymbolName(crel->file, crel->file->symtab + symnum);
	flag = _LoaderHandleUnresolved(name,
				       _LoaderHandleToName(crel->file->
							   handle));
	xf86loaderfree(name);
	if (flag)
	    fatalsym = 1;
	crel = crel->next;
    }
    return fatalsym;
}

void
AOUTUnloadModule(void *modptr)
{
    AOUTModulePtr aoutfile = (AOUTModulePtr) modptr;
    AOUTRelocPtr relptr, *prevptr;

#ifdef AOUTDEBUG
    AOUTDEBUG("AOUTUnLoadModule(0x%p)\n", modptr);
#endif

/*
 * Delete any unresolved relocations
 */

    relptr = _LoaderGetRelocations(aoutfile->funcs)->aout_reloc;
    prevptr = &(_LoaderGetRelocations(aoutfile->funcs)->aout_reloc);

    while (relptr) {
	if (relptr->file == aoutfile) {
	    *prevptr = relptr->next;
	    xf86loaderfree(relptr);
	    relptr = *prevptr;
	} else {
	    prevptr = &(relptr->next);
	    relptr = relptr->next;
	}
    }				/* while */

    /* clean the symbols table */
    LoaderHashTraverse((void *)aoutfile, AOUTHashCleanOut);

#define CheckandFree(ptr,size)  if(ptr) _LoaderFreeFileMem((ptr),(size))

    CheckandFree(aoutfile->strings, aoutfile->strsize);
    CheckandFree(aoutfile->symtab, aoutfile->header->a_syms);
    CheckandFree(aoutfile->datarel, aoutfile->header->a_drsize);
    CheckandFree(aoutfile->txtrel, aoutfile->header->a_trsize);
    CheckandFree(aoutfile->data, aoutfile->header->a_data);
    CheckandFree(aoutfile->text, aoutfile->header->a_text);
    /* Free allocated sections */
    if (aoutfile->bss != NULL) {
	xf86loaderfree(aoutfile->bss);
    }
    if (aoutfile->common != NULL) {
	xf86loaderfree(aoutfile->common);
    }

    /* Free header */
    _LoaderFreeFileMem(aoutfile->header, sizeof(AOUTHDR));

    /* Free the module structure itself */
    xf86loaderfree(aoutfile);

    return;
}

char *
AOUTAddressToSection(void *modptr, unsigned long address)
{
    AOUTModulePtr aoutfile = (AOUTModulePtr) modptr;

    if (address >= (unsigned long)aoutfile->text &&
	address <= (unsigned long)aoutfile->text + aoutfile->textsize) {
	return "text";
    }
    if (address >= (unsigned long)aoutfile->data &&
	address <= (unsigned long)aoutfile->data + aoutfile->datasize) {
	return "data";
    }
    if (address >= (unsigned long)aoutfile->bss &&
	address <= (unsigned long)aoutfile->bss + aoutfile->bsssize) {
	return "bss";
    }

    return NULL;
}