?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
nasm: rename nasm_zap_spaces() to nasm_zap_spaces_fwd()
[nasm/avx512.git] / output / outelf32.c
blob47c9d10392dcbdf6c00f444ee6e9291378a8eb54
1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 1996-2009 The NASM Authors - All Rights Reserved
4 * See the file AUTHORS included with the NASM distribution for
5 * the specific copyright holders.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following
9 * conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 * ----------------------------------------------------------------------- */
33
34 /*
35 * outelf32.c output routines for the Netwide Assembler to produce
36 * ELF32 (i386 of course) object file format
37 */
38
39 #include "compiler.h"
40
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <ctype.h>
45 #include <inttypes.h>
46
47 #include "nasm.h"
48 #include "nasmlib.h"
49 #include "saa.h"
50 #include "raa.h"
51 #include "stdscan.h"
52 #include "eval.h"
53 #include "output/outform.h"
54 #include "output/outlib.h"
55 #include "rbtree.h"
56
57 #include "output/elf32.h"
58 #include "output/dwarf.h"
59 #include "output/outelf.h"
60
61 #ifdef OF_ELF32
62
63 /*
64 * Relocation types.
65 */
66 struct Reloc {
67 struct Reloc *next;
68 int32_t address; /* relative to _start_ of section */
69 int32_t symbol; /* symbol index */
70 int type; /* type of relocation */
71 };
72
73 struct Symbol {
74 struct rbtree symv; /* symbol value and symbol rbtree */
75 int32_t strpos; /* string table position of name */
76 int32_t section; /* section ID of the symbol */
77 int type; /* symbol type */
78 int other; /* symbol visibility */
79 int32_t size; /* size of symbol */
80 int32_t globnum; /* symbol table offset if global */
81 struct Symbol *nextfwd; /* list of unresolved-size symbols */
82 char *name; /* used temporarily if in above list */
83 };
84
85 struct Section {
86 struct SAA *data;
87 uint32_t len, size, nrelocs;
88 int32_t index;
89 int type; /* SHT_PROGBITS or SHT_NOBITS */
90 uint32_t align; /* alignment: power of two */
91 uint32_t flags; /* section flags */
92 char *name;
93 struct SAA *rel;
94 int32_t rellen;
95 struct Reloc *head, **tail;
96 struct rbtree *gsyms; /* global symbols in section */
97 };
98
99 #define SECT_DELTA 32
100 static struct Section **sects;
101 static int nsects, sectlen;
102
103 #define SHSTR_DELTA 256
104 static char *shstrtab;
105 static int shstrtablen, shstrtabsize;
106
107 static struct SAA *syms;
108 static uint32_t nlocals, nglobs, ndebugs; /* Symbol counts */
109
110 static int32_t def_seg;
111
112 static struct RAA *bsym;
113
114 static struct SAA *strs;
115 static uint32_t strslen;
116
117 static struct Symbol *fwds;
118
119 static char elf_module[FILENAME_MAX];
120
121 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
122 static uint8_t elf_abiver = 0; /* Current ABI version */
123
124 extern struct ofmt of_elf32;
125 extern struct ofmt of_elf;
126
127 #define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
128
129 static struct ELF_SECTDATA {
130 void *data;
131 int32_t len;
132 bool is_saa;
133 } *elf_sects;
134 static int elf_nsect, nsections;
135 static int32_t elf_foffs;
136
137 static void elf_write(void);
138 static void elf_sect_write(struct Section *, const uint8_t *,
139 uint32_t);
140 static void elf_section_header(int, int, int, void *, bool, int32_t, int, int,
141 int, int);
142 static void elf_write_sections(void);
143 static struct SAA *elf_build_symtab(int32_t *, int32_t *);
144 static struct SAA *elf_build_reltab(int32_t *, struct Reloc *);
145 static void add_sectname(char *, char *);
146
147 struct stabentry {
148 uint32_t n_strx;
149 uint8_t n_type;
150 uint8_t n_other;
151 uint16_t n_desc;
152 uint32_t n_value;
153 };
154
155 struct erel {
156 int offset, info;
157 };
158
159 struct symlininfo {
160 int offset;
161 int section; /* section index */
162 char *name; /* shallow-copied pointer of section name */
163 };
164
165 struct linelist {
166 struct symlininfo info;
167 int line;
168 char *filename;
169 struct linelist *next;
170 struct linelist *last;
171 };
172
173 struct sectlist {
174 struct SAA *psaa;
175 int section;
176 int line;
177 int offset;
178 int file;
179 struct sectlist *next;
180 struct sectlist *last;
181 };
182
183 /* common debug variables */
184 static int currentline = 1;
185 static int debug_immcall = 0;
186
187 /* stabs debug variables */
188 static struct linelist *stabslines = 0;
189 static int numlinestabs = 0;
190 static char *stabs_filename = 0;
191 static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
192 static int stablen, stabstrlen, stabrellen;
193
194 /* dwarf debug variables */
195 static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
196 static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
197 static int dwarf_numfiles = 0, dwarf_nsections;
198 static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
199 *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
200 static int8_t line_base = -5, line_range = 14, opcode_base = 13;
201 static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
202 abbrevlen, linelen, linerellen, framelen, loclen;
203 static int32_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
204
205 static struct dfmt df_dwarf;
206 static struct dfmt df_stabs;
207 static struct Symbol *lastsym;
208
209 /* common debugging routines */
210 static void debug32_typevalue(int32_t);
211 static void debug32_deflabel(char *, int32_t, int64_t, int, char *);
212 static void debug32_directive(const char *, const char *);
213
214 /* stabs debugging routines */
215 static void stabs32_linenum(const char *filename, int32_t linenumber, int32_t);
216 static void stabs32_output(int, void *);
217 static void stabs32_generate(void);
218 static void stabs32_cleanup(void);
219
220 /* dwarf debugging routines */
221 static void dwarf32_init(void);
222 static void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t);
223 static void dwarf32_output(int, void *);
224 static void dwarf32_generate(void);
225 static void dwarf32_cleanup(void);
226 static void dwarf32_findfile(const char *);
227 static void dwarf32_findsect(const int);
228
229 /*
230 * Special NASM section numbers which are used to define ELF special
231 * symbols, which can be used with WRT to provide PIC and TLS
232 * relocation types.
233 */
234 static int32_t elf_gotpc_sect, elf_gotoff_sect;
235 static int32_t elf_got_sect, elf_plt_sect;
236 static int32_t elf_sym_sect, elf_tlsie_sect;
237
238 static void elf_init(void)
239 {
240 sects = NULL;
241 nsects = sectlen = 0;
242 syms = saa_init((int32_t)sizeof(struct Symbol));
243 nlocals = nglobs = ndebugs = 0;
244 bsym = raa_init();
245 strs = saa_init(1L);
246 saa_wbytes(strs, "\0", 1L);
247 saa_wbytes(strs, elf_module, strlen(elf_module)+1);
248 strslen = 2 + strlen(elf_module);
249 shstrtab = NULL;
250 shstrtablen = shstrtabsize = 0;;
251 add_sectname("", "");
252
253 fwds = NULL;
254
255 elf_gotpc_sect = seg_alloc();
256 define_label("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false);
257 elf_gotoff_sect = seg_alloc();
258 define_label("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false);
259 elf_got_sect = seg_alloc();
260 define_label("..got", elf_got_sect + 1, 0L, NULL, false, false);
261 elf_plt_sect = seg_alloc();
262 define_label("..plt", elf_plt_sect + 1, 0L, NULL, false, false);
263 elf_sym_sect = seg_alloc();
264 define_label("..sym", elf_sym_sect + 1, 0L, NULL, false, false);
265 elf_tlsie_sect = seg_alloc();
266 define_label("..tlsie", elf_tlsie_sect + 1, 0L, NULL, false, false);
267
268 def_seg = seg_alloc();
269 }
270
271 static void elf_init_hack(void)
272 {
273 of_elf32.current_dfmt = of_elf.current_dfmt; /* Sync debugging format */
274 elf_init();
275 }
276
277 static void elf_cleanup(int debuginfo)
278 {
279 struct Reloc *r;
280 int i;
281
282 (void)debuginfo;
283
284 elf_write();
285 for (i = 0; i < nsects; i++) {
286 if (sects[i]->type != SHT_NOBITS)
287 saa_free(sects[i]->data);
288 if (sects[i]->head)
289 saa_free(sects[i]->rel);
290 while (sects[i]->head) {
291 r = sects[i]->head;
292 sects[i]->head = sects[i]->head->next;
293 nasm_free(r);
294 }
295 }
296 nasm_free(sects);
297 saa_free(syms);
298 raa_free(bsym);
299 saa_free(strs);
300 if (of_elf32.current_dfmt) {
301 of_elf32.current_dfmt->cleanup();
302 }
303 }
304
305 static void add_sectname(char *firsthalf, char *secondhalf)
306 {
307 int len = strlen(firsthalf) + strlen(secondhalf);
308 while (shstrtablen + len + 1 > shstrtabsize)
309 shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
310 strcpy(shstrtab + shstrtablen, firsthalf);
311 strcat(shstrtab + shstrtablen, secondhalf);
312 shstrtablen += len + 1;
313 }
314
315 static int elf_make_section(char *name, int type, int flags, int align)
316 {
317 struct Section *s;
318
319 s = nasm_malloc(sizeof(*s));
320
321 if (type != SHT_NOBITS)
322 s->data = saa_init(1L);
323 s->head = NULL;
324 s->tail = &s->head;
325 s->len = s->size = 0;
326 s->nrelocs = 0;
327 if (!strcmp(name, ".text"))
328 s->index = def_seg;
329 else
330 s->index = seg_alloc();
331 add_sectname("", name);
332 s->name = nasm_malloc(1 + strlen(name));
333 strcpy(s->name, name);
334 s->type = type;
335 s->flags = flags;
336 s->align = align;
337 s->gsyms = NULL;
338
339 if (nsects >= sectlen)
340 sects = nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
341 sects[nsects++] = s;
342
343 return nsects - 1;
344 }
345
346
347 static int32_t elf_section_names(char *name, int pass, int *bits)
348 {
349 char *p;
350 uint32_t flags, flags_and, flags_or;
351 uint32_t align;
352 int type, i;
353
354 /*
355 * Default is 32 bits.
356 */
357 if (!name) {
358 *bits = 32;
359 return def_seg;
360 }
361
362 p = name;
363 while (*p && !nasm_isspace(*p))
364 p++;
365 if (*p)
366 *p++ = '\0';
367 flags_and = flags_or = type = align = 0;
368
369 while (*p && nasm_isspace(*p))
370 p++;
371 while (*p) {
372 char *q = p;
373 while (*p && !nasm_isspace(*p))
374 p++;
375 if (*p)
376 *p++ = '\0';
377 while (*p && nasm_isspace(*p))
378 p++;
379
380 if (!nasm_strnicmp(q, "align=", 6)) {
381 align = atoi(q + 6);
382 if (align == 0)
383 align = 1;
384 if ((align - 1) & align) { /* means it's not a power of two */
385 nasm_error(ERR_NONFATAL, "section alignment %d is not"
386 " a power of two", align);
387 align = 1;
388 }
389 } else if (!nasm_stricmp(q, "alloc")) {
390 flags_and |= SHF_ALLOC;
391 flags_or |= SHF_ALLOC;
392 } else if (!nasm_stricmp(q, "noalloc")) {
393 flags_and |= SHF_ALLOC;
394 flags_or &= ~SHF_ALLOC;
395 } else if (!nasm_stricmp(q, "exec")) {
396 flags_and |= SHF_EXECINSTR;
397 flags_or |= SHF_EXECINSTR;
398 } else if (!nasm_stricmp(q, "noexec")) {
399 flags_and |= SHF_EXECINSTR;
400 flags_or &= ~SHF_EXECINSTR;
401 } else if (!nasm_stricmp(q, "write")) {
402 flags_and |= SHF_WRITE;
403 flags_or |= SHF_WRITE;
404 } else if (!nasm_stricmp(q, "tls")) {
405 flags_and |= SHF_TLS;
406 flags_or |= SHF_TLS;
407 } else if (!nasm_stricmp(q, "nowrite")) {
408 flags_and |= SHF_WRITE;
409 flags_or &= ~SHF_WRITE;
410 } else if (!nasm_stricmp(q, "progbits")) {
411 type = SHT_PROGBITS;
412 } else if (!nasm_stricmp(q, "nobits")) {
413 type = SHT_NOBITS;
414 } else if (pass == 1) {
415 nasm_error(ERR_WARNING, "Unknown section attribute '%s' ignored on"
416 " declaration of section `%s'", q, name);
417 }
418 }
419
420 if (!strcmp(name, ".shstrtab") ||
421 !strcmp(name, ".symtab") ||
422 !strcmp(name, ".strtab")) {
423 nasm_error(ERR_NONFATAL, "attempt to redefine reserved section"
424 "name `%s'", name);
425 return NO_SEG;
426 }
427
428 for (i = 0; i < nsects; i++)
429 if (!strcmp(name, sects[i]->name))
430 break;
431 if (i == nsects) {
432 const struct elf_known_section *ks = elf_known_sections;
433
434 while (ks->name) {
435 if (!strcmp(name, ks->name))
436 break;
437 ks++;
438 }
439
440 type = type ? type : ks->type;
441 align = align ? align : ks->align;
442 flags = (ks->flags & ~flags_and) | flags_or;
443
444 i = elf_make_section(name, type, flags, align);
445 } else if (pass == 1) {
446 if ((type && sects[i]->type != type)
447 || (align && sects[i]->align != align)
448 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
449 nasm_error(ERR_WARNING, "section attributes ignored on"
450 " redeclaration of section `%s'", name);
451 }
452
453 return sects[i]->index;
454 }
455
456 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
457 int is_global, char *special)
458 {
459 int pos = strslen;
460 struct Symbol *sym;
461 bool special_used = false;
462
463 #if defined(DEBUG) && DEBUG>2
464 nasm_error(ERR_DEBUG,
465 " elf_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n",
466 name, segment, offset, is_global, special);
467 #endif
468 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
469 /*
470 * This is a NASM special symbol. We never allow it into
471 * the ELF symbol table, even if it's a valid one. If it
472 * _isn't_ a valid one, we should barf immediately.
473 */
474 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
475 strcmp(name, "..got") && strcmp(name, "..plt") &&
476 strcmp(name, "..sym") && strcmp(name, "..tlsie"))
477 nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
478 return;
479 }
480
481 if (is_global == 3) {
482 struct Symbol **s;
483 /*
484 * Fix up a forward-reference symbol size from the first
485 * pass.
486 */
487 for (s = &fwds; *s; s = &(*s)->nextfwd)
488 if (!strcmp((*s)->name, name)) {
489 struct tokenval tokval;
490 expr *e;
491 char *p = special;
492
493 while (*p && !nasm_isspace(*p))
494 p++;
495 while (*p && nasm_isspace(*p))
496 p++;
497 stdscan_reset();
498 stdscan_bufptr = p;
499 tokval.t_type = TOKEN_INVALID;
500 e = evaluate(stdscan, NULL, &tokval, NULL, 1, nasm_error, NULL);
501 if (e) {
502 if (!is_simple(e))
503 nasm_error(ERR_NONFATAL, "cannot use relocatable"
504 " expression as symbol size");
505 else
506 (*s)->size = reloc_value(e);
507 }
508
509 /*
510 * Remove it from the list of unresolved sizes.
511 */
512 nasm_free((*s)->name);
513 *s = (*s)->nextfwd;
514 return;
515 }
516 return; /* it wasn't an important one */
517 }
518
519 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
520 strslen += 1 + strlen(name);
521
522 lastsym = sym = saa_wstruct(syms);
523
524 memset(&sym->symv, 0, sizeof(struct rbtree));
525
526 sym->strpos = pos;
527 sym->type = is_global ? SYM_GLOBAL : 0;
528 sym->other = STV_DEFAULT;
529 sym->size = 0;
530 if (segment == NO_SEG)
531 sym->section = SHN_ABS;
532 else {
533 int i;
534 sym->section = SHN_UNDEF;
535 if (nsects == 0 && segment == def_seg) {
536 int tempint;
537 if (segment != elf_section_names(".text", 2, &tempint))
538 nasm_error(ERR_PANIC,
539 "strange segment conditions in ELF driver");
540 sym->section = nsects;
541 } else {
542 for (i = 0; i < nsects; i++)
543 if (segment == sects[i]->index) {
544 sym->section = i + 1;
545 break;
546 }
547 }
548 }
549
550 if (is_global == 2) {
551 sym->size = offset;
552 sym->symv.key = 0;
553 sym->section = SHN_COMMON;
554 /*
555 * We have a common variable. Check the special text to see
556 * if it's a valid number and power of two; if so, store it
557 * as the alignment for the common variable.
558 */
559 if (special) {
560 bool err;
561 sym->symv.key = readnum(special, &err);
562 if (err)
563 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
564 " valid number", special);
565 else if ((sym->symv.key | (sym->symv.key - 1)) != 2 * sym->symv.key - 1)
566 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
567 " power of two", special);
568 }
569 special_used = true;
570 } else
571 sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
572
573 if (sym->type == SYM_GLOBAL) {
574 /*
575 * If sym->section == SHN_ABS, then the first line of the
576 * else section would cause a core dump, because its a reference
577 * beyond the end of the section array.
578 * This behaviour is exhibited by this code:
579 * GLOBAL crash_nasm
580 * crash_nasm equ 0
581 * To avoid such a crash, such requests are silently discarded.
582 * This may not be the best solution.
583 */
584 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
585 bsym = raa_write(bsym, segment, nglobs);
586 } else if (sym->section != SHN_ABS) {
587 /*
588 * This is a global symbol; so we must add it to the rbtree
589 * of global symbols in its section.
590 *
591 * In addition, we check the special text for symbol
592 * type and size information.
593 */
594 sects[sym->section-1]->gsyms =
595 rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
596
597 if (special) {
598 int n = strcspn(special, " \t");
599
600 if (!nasm_strnicmp(special, "function", n))
601 sym->type |= STT_FUNC;
602 else if (!nasm_strnicmp(special, "data", n) ||
603 !nasm_strnicmp(special, "object", n))
604 sym->type |= STT_OBJECT;
605 else if (!nasm_strnicmp(special, "notype", n))
606 sym->type |= STT_NOTYPE;
607 else
608 nasm_error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
609 n, special);
610 special += n;
611
612 while (nasm_isspace(*special))
613 ++special;
614 if (*special) {
615 n = strcspn(special, " \t");
616 if (!nasm_strnicmp(special, "default", n))
617 sym->other = STV_DEFAULT;
618 else if (!nasm_strnicmp(special, "internal", n))
619 sym->other = STV_INTERNAL;
620 else if (!nasm_strnicmp(special, "hidden", n))
621 sym->other = STV_HIDDEN;
622 else if (!nasm_strnicmp(special, "protected", n))
623 sym->other = STV_PROTECTED;
624 else
625 n = 0;
626 special += n;
627 }
628
629 if (*special) {
630 struct tokenval tokval;
631 expr *e;
632 int fwd = 0;
633 char *saveme = stdscan_bufptr; /* bugfix? fbk 8/10/00 */
634
635 while (special[n] && nasm_isspace(special[n]))
636 n++;
637 /*
638 * We have a size expression; attempt to
639 * evaluate it.
640 */
641 stdscan_reset();
642 stdscan_bufptr = special + n;
643 tokval.t_type = TOKEN_INVALID;
644 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, nasm_error,
645 NULL);
646 if (fwd) {
647 sym->nextfwd = fwds;
648 fwds = sym;
649 sym->name = nasm_strdup(name);
650 } else if (e) {
651 if (!is_simple(e))
652 nasm_error(ERR_NONFATAL, "cannot use relocatable"
653 " expression as symbol size");
654 else
655 sym->size = reloc_value(e);
656 }
657 stdscan_bufptr = saveme; /* bugfix? fbk 8/10/00 */
658 }
659 special_used = true;
660 }
661 /*
662 * If TLS segment, mark symbol accordingly.
663 */
664 if (sects[sym->section - 1]->flags & SHF_TLS) {
665 sym->type &= 0xf0;
666 sym->type |= STT_TLS;
667 }
668 }
669 sym->globnum = nglobs;
670 nglobs++;
671 } else
672 nlocals++;
673
674 if (special && !special_used)
675 nasm_error(ERR_NONFATAL, "no special symbol features supported here");
676 }
677
678 static void elf_add_reloc(struct Section *sect, int32_t segment, int type)
679 {
680 struct Reloc *r;
681
682 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
683 sect->tail = &r->next;
684 r->next = NULL;
685
686 r->address = sect->len;
687 if (segment == NO_SEG)
688 r->symbol = 0;
689 else {
690 int i;
691 r->symbol = 0;
692 for (i = 0; i < nsects; i++)
693 if (segment == sects[i]->index)
694 r->symbol = i + 2;
695 if (!r->symbol)
696 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
697 }
698 r->type = type;
699
700 sect->nrelocs++;
701 }
702
703 /*
704 * This routine deals with ..got and ..sym relocations: the more
705 * complicated kinds. In shared-library writing, some relocations
706 * with respect to global symbols must refer to the precise symbol
707 * rather than referring to an offset from the base of the section
708 * _containing_ the symbol. Such relocations call to this routine,
709 * which searches the symbol list for the symbol in question.
710 *
711 * R_386_GOT32 references require the _exact_ symbol address to be
712 * used; R_386_32 references can be at an offset from the symbol.
713 * The boolean argument `exact' tells us this.
714 *
715 * Return value is the adjusted value of `addr', having become an
716 * offset from the symbol rather than the section. Should always be
717 * zero when returning from an exact call.
718 *
719 * Limitation: if you define two symbols at the same place,
720 * confusion will occur.
721 *
722 * Inefficiency: we search, currently, using a linked list which
723 * isn't even necessarily sorted.
724 */
725 static int32_t elf_add_gsym_reloc(struct Section *sect,
726 int32_t segment, uint32_t offset,
727 int type, bool exact)
728 {
729 struct Reloc *r;
730 struct Section *s;
731 struct Symbol *sym;
732 struct rbtree *srb;
733 int i;
734
735 /*
736 * First look up the segment/offset pair and find a global
737 * symbol corresponding to it. If it's not one of our segments,
738 * then it must be an external symbol, in which case we're fine
739 * doing a normal elf_add_reloc after first sanity-checking
740 * that the offset from the symbol is zero.
741 */
742 s = NULL;
743 for (i = 0; i < nsects; i++)
744 if (segment == sects[i]->index) {
745 s = sects[i];
746 break;
747 }
748 if (!s) {
749 if (exact && offset != 0)
750 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
751 " for this reference");
752 else
753 elf_add_reloc(sect, segment, type);
754 return offset;
755 }
756
757 srb = rb_search(s->gsyms, offset);
758 if (!srb || (exact && srb->key != offset)) {
759 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
760 " for this reference");
761 return 0;
762 }
763 sym = container_of(srb, struct Symbol, symv);
764
765 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
766 sect->tail = &r->next;
767 r->next = NULL;
768
769 r->address = sect->len;
770 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
771 r->type = type;
772
773 sect->nrelocs++;
774
775 return offset - sym->symv.key;
776 }
777
778 static void elf_out(int32_t segto, const void *data,
779 enum out_type type, uint64_t size,
780 int32_t segment, int32_t wrt)
781 {
782 struct Section *s;
783 int32_t addr;
784 uint8_t mydata[4], *p;
785 int i;
786 static struct symlininfo sinfo;
787
788 /*
789 * handle absolute-assembly (structure definitions)
790 */
791 if (segto == NO_SEG) {
792 if (type != OUT_RESERVE)
793 nasm_error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
794 " space");
795 return;
796 }
797
798 s = NULL;
799 for (i = 0; i < nsects; i++)
800 if (segto == sects[i]->index) {
801 s = sects[i];
802 break;
803 }
804 if (!s) {
805 int tempint; /* ignored */
806 if (segto != elf_section_names(".text", 2, &tempint))
807 nasm_error(ERR_PANIC, "strange segment conditions in ELF driver");
808 else {
809 s = sects[nsects - 1];
810 i = nsects - 1;
811 }
812 }
813
814 /* again some stabs debugging stuff */
815 if (of_elf32.current_dfmt) {
816 sinfo.offset = s->len;
817 sinfo.section = i;
818 sinfo.name = s->name;
819 of_elf32.current_dfmt->debug_output(TY_STABSSYMLIN, &sinfo);
820 }
821 /* end of debugging stuff */
822
823 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
824 nasm_error(ERR_WARNING, "attempt to initialize memory in"
825 " BSS section `%s': ignored", s->name);
826 s->len += realsize(type, size);
827 return;
828 }
829
830 if (type == OUT_RESERVE) {
831 if (s->type == SHT_PROGBITS) {
832 nasm_error(ERR_WARNING, "uninitialized space declared in"
833 " non-BSS section `%s': zeroing", s->name);
834 elf_sect_write(s, NULL, size);
835 } else
836 s->len += size;
837 } else if (type == OUT_RAWDATA) {
838 if (segment != NO_SEG)
839 nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
840 elf_sect_write(s, data, size);
841 } else if (type == OUT_ADDRESS) {
842 bool gnu16 = false;
843 addr = *(int64_t *)data;
844 if (segment != NO_SEG) {
845 if (segment % 2) {
846 nasm_error(ERR_NONFATAL, "ELF format does not support"
847 " segment base references");
848 } else {
849 if (wrt == NO_SEG) {
850 if (size == 2) {
851 gnu16 = true;
852 elf_add_reloc(s, segment, R_386_16);
853 } else {
854 elf_add_reloc(s, segment, R_386_32);
855 }
856 } else if (wrt == elf_gotpc_sect + 1) {
857 /*
858 * The user will supply GOT relative to $$. ELF
859 * will let us have GOT relative to $. So we
860 * need to fix up the data item by $-$$.
861 */
862 addr += s->len;
863 elf_add_reloc(s, segment, R_386_GOTPC);
864 } else if (wrt == elf_gotoff_sect + 1) {
865 elf_add_reloc(s, segment, R_386_GOTOFF);
866 } else if (wrt == elf_tlsie_sect + 1) {
867 addr = elf_add_gsym_reloc(s, segment, addr,
868 R_386_TLS_IE, true);
869 } else if (wrt == elf_got_sect + 1) {
870 addr = elf_add_gsym_reloc(s, segment, addr,
871 R_386_GOT32, true);
872 } else if (wrt == elf_sym_sect + 1) {
873 if (size == 2) {
874 gnu16 = true;
875 addr = elf_add_gsym_reloc(s, segment, addr,
876 R_386_16, false);
877 } else {
878 addr = elf_add_gsym_reloc(s, segment, addr,
879 R_386_32, false);
880 }
881 } else if (wrt == elf_plt_sect + 1) {
882 nasm_error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
883 "relative PLT references");
884 } else {
885 nasm_error(ERR_NONFATAL, "ELF format does not support this"
886 " use of WRT");
887 wrt = NO_SEG; /* we can at least _try_ to continue */
888 }
889 }
890 }
891 p = mydata;
892 if (gnu16) {
893 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
894 "16-bit relocations in ELF is a GNU extension");
895 WRITESHORT(p, addr);
896 } else {
897 if (size != 4 && segment != NO_SEG) {
898 nasm_error(ERR_NONFATAL,
899 "Unsupported non-32-bit ELF relocation");
900 }
901 WRITELONG(p, addr);
902 }
903 elf_sect_write(s, mydata, size);
904 } else if (type == OUT_REL2ADR) {
905 if (segment == segto)
906 nasm_error(ERR_PANIC, "intra-segment OUT_REL2ADR");
907 if (segment != NO_SEG && segment % 2) {
908 nasm_error(ERR_NONFATAL, "ELF format does not support"
909 " segment base references");
910 } else {
911 if (wrt == NO_SEG) {
912 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
913 "16-bit relocations in ELF is a GNU extension");
914 elf_add_reloc(s, segment, R_386_PC16);
915 } else {
916 nasm_error(ERR_NONFATAL,
917 "Unsupported non-32-bit ELF relocation");
918 }
919 }
920 p = mydata;
921 WRITESHORT(p, *(int64_t *)data - size);
922 elf_sect_write(s, mydata, 2L);
923 } else if (type == OUT_REL4ADR) {
924 if (segment == segto)
925 nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR");
926 if (segment != NO_SEG && segment % 2) {
927 nasm_error(ERR_NONFATAL, "ELF format does not support"
928 " segment base references");
929 } else {
930 if (wrt == NO_SEG) {
931 elf_add_reloc(s, segment, R_386_PC32);
932 } else if (wrt == elf_plt_sect + 1) {
933 elf_add_reloc(s, segment, R_386_PLT32);
934 } else if (wrt == elf_gotpc_sect + 1 ||
935 wrt == elf_gotoff_sect + 1 ||
936 wrt == elf_got_sect + 1) {
937 nasm_error(ERR_NONFATAL, "ELF format cannot produce PC-"
938 "relative GOT references");
939 } else {
940 nasm_error(ERR_NONFATAL, "ELF format does not support this"
941 " use of WRT");
942 wrt = NO_SEG; /* we can at least _try_ to continue */
943 }
944 }
945 p = mydata;
946 WRITELONG(p, *(int64_t *)data - size);
947 elf_sect_write(s, mydata, 4L);
948 }
949 }
950
951 static void elf_write(void)
952 {
953 int align;
954 char *p;
955 int i;
956
957 struct SAA *symtab;
958 int32_t symtablen, symtablocal;
959
960 /*
961 * Work out how many sections we will have. We have SHN_UNDEF,
962 * then the flexible user sections, then the fixed sections
963 * `.shstrtab', `.symtab' and `.strtab', then optionally
964 * relocation sections for the user sections.
965 */
966 nsections = sec_numspecial + 1;
967 if (of_elf32.current_dfmt == &df_stabs)
968 nsections += 3;
969 else if (of_elf32.current_dfmt == &df_dwarf)
970 nsections += 10;
971
972 add_sectname("", ".shstrtab");
973 add_sectname("", ".symtab");
974 add_sectname("", ".strtab");
975 for (i = 0; i < nsects; i++) {
976 nsections++; /* for the section itself */
977 if (sects[i]->head) {
978 nsections++; /* for its relocations */
979 add_sectname(".rel", sects[i]->name);
980 }
981 }
982
983 if (of_elf32.current_dfmt == &df_stabs) {
984 /* in case the debug information is wanted, just add these three sections... */
985 add_sectname("", ".stab");
986 add_sectname("", ".stabstr");
987 add_sectname(".rel", ".stab");
988 } else if (of_elf32.current_dfmt == &df_dwarf) {
989 /* the dwarf debug standard specifies the following ten sections,
990 not all of which are currently implemented,
991 although all of them are defined. */
992 add_sectname("", ".debug_aranges");
993 add_sectname(".rela", ".debug_aranges");
994 add_sectname("", ".debug_pubnames");
995 add_sectname("", ".debug_info");
996 add_sectname(".rela", ".debug_info");
997 add_sectname("", ".debug_abbrev");
998 add_sectname("", ".debug_line");
999 add_sectname(".rela", ".debug_line");
1000 add_sectname("", ".debug_frame");
1001 add_sectname("", ".debug_loc");
1002 }
1003
1004 /*
1005 * Output the ELF header.
1006 */
1007 fwrite("\177ELF\1\1\1", 7, 1, ofile);
1008 fputc(elf_osabi, ofile);
1009 fputc(elf_abiver, ofile);
1010 fwritezero(7, ofile);
1011 fwriteint16_t(1, ofile); /* ET_REL relocatable file */
1012 fwriteint16_t(3, ofile); /* EM_386 processor ID */
1013 fwriteint32_t(1L, ofile); /* EV_CURRENT file format version */
1014 fwriteint32_t(0L, ofile); /* no entry point */
1015 fwriteint32_t(0L, ofile); /* no program header table */
1016 fwriteint32_t(0x40L, ofile); /* section headers straight after
1017 * ELF header plus alignment */
1018 fwriteint32_t(0L, ofile); /* 386 defines no special flags */
1019 fwriteint16_t(0x34, ofile); /* size of ELF header */
1020 fwriteint16_t(0, ofile); /* no program header table, again */
1021 fwriteint16_t(0, ofile); /* still no program header table */
1022 fwriteint16_t(0x28, ofile); /* size of section header */
1023 fwriteint16_t(nsections, ofile); /* number of sections */
1024 fwriteint16_t(sec_shstrtab, ofile); /* string table section index for
1025 * section header table */
1026 fwriteint32_t(0L, ofile); /* align to 0x40 bytes */
1027 fwriteint32_t(0L, ofile);
1028 fwriteint32_t(0L, ofile);
1029
1030 /*
1031 * Build the symbol table and relocation tables.
1032 */
1033 symtab = elf_build_symtab(&symtablen, &symtablocal);
1034 for (i = 0; i < nsects; i++)
1035 if (sects[i]->head)
1036 sects[i]->rel = elf_build_reltab(&sects[i]->rellen,
1037 sects[i]->head);
1038
1039 /*
1040 * Now output the section header table.
1041 */
1042
1043 elf_foffs = 0x40 + 0x28 * nsections;
1044 align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
1045 elf_foffs += align;
1046 elf_nsect = 0;
1047 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1048
1049 /* SHN_UNDEF */
1050 elf_section_header(0, SHT_NULL, 0, NULL, false, 0, SHN_UNDEF, 0, 0, 0);
1051 p = shstrtab + 1;
1052
1053 /* The normal sections */
1054 for (i = 0; i < nsects; i++) {
1055 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1056 (sects[i]->type == SHT_PROGBITS ?
1057 sects[i]->data : NULL), true,
1058 sects[i]->len, 0, 0, sects[i]->align, 0);
1059 p += strlen(p) + 1;
1060 }
1061
1062 /* .shstrtab */
1063 elf_section_header(p - shstrtab, SHT_STRTAB, 0, shstrtab, false,
1064 shstrtablen, 0, 0, 1, 0);
1065 p += strlen(p) + 1;
1066
1067 /* .symtab */
1068 elf_section_header(p - shstrtab, SHT_SYMTAB, 0, symtab, true,
1069 symtablen, sec_strtab, symtablocal, 4, 16);
1070 p += strlen(p) + 1;
1071
1072 /* .strtab */
1073 elf_section_header(p - shstrtab, SHT_STRTAB, 0, strs, true,
1074 strslen, 0, 0, 1, 0);
1075 p += strlen(p) + 1;
1076
1077 /* The relocation sections */
1078 for (i = 0; i < nsects; i++)
1079 if (sects[i]->head) {
1080 elf_section_header(p - shstrtab, SHT_REL, 0, sects[i]->rel, true,
1081 sects[i]->rellen, sec_symtab, i + 1, 4, 8);
1082 p += strlen(p) + 1;
1083 }
1084
1085 if (of_elf32.current_dfmt == &df_stabs) {
1086 /* for debugging information, create the last three sections
1087 which are the .stab , .stabstr and .rel.stab sections respectively */
1088
1089 /* this function call creates the stab sections in memory */
1090 stabs32_generate();
1091
1092 if (stabbuf && stabstrbuf && stabrelbuf) {
1093 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, stabbuf, false,
1094 stablen, sec_stabstr, 0, 4, 12);
1095 p += strlen(p) + 1;
1096
1097 elf_section_header(p - shstrtab, SHT_STRTAB, 0, stabstrbuf, false,
1098 stabstrlen, 0, 0, 4, 0);
1099 p += strlen(p) + 1;
1100
1101 /* link -> symtable info -> section to refer to */
1102 elf_section_header(p - shstrtab, SHT_REL, 0, stabrelbuf, false,
1103 stabrellen, sec_symtab, sec_stab, 4, 8);
1104 p += strlen(p) + 1;
1105 }
1106 } else if (of_elf32.current_dfmt == &df_dwarf) {
1107 /* for dwarf debugging information, create the ten dwarf sections */
1108
1109 /* this function call creates the dwarf sections in memory */
1110 if (dwarf_fsect)
1111 dwarf32_generate();
1112
1113 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1114 arangeslen, 0, 0, 1, 0);
1115 p += strlen(p) + 1;
1116
1117 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1118 arangesrellen, sec_symtab, sec_debug_aranges,
1119 1, 12);
1120 p += strlen(p) + 1;
1121
1122 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf,
1123 false, pubnameslen, 0, 0, 1, 0);
1124 p += strlen(p) + 1;
1125
1126 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1127 infolen, 0, 0, 1, 0);
1128 p += strlen(p) + 1;
1129
1130 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1131 inforellen, sec_symtab, sec_debug_info, 1, 12);
1132 p += strlen(p) + 1;
1133
1134 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1135 abbrevlen, 0, 0, 1, 0);
1136 p += strlen(p) + 1;
1137
1138 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1139 linelen, 0, 0, 1, 0);
1140 p += strlen(p) + 1;
1141
1142 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1143 linerellen, sec_symtab, sec_debug_line, 1, 12);
1144 p += strlen(p) + 1;
1145
1146 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1147 framelen, 0, 0, 8, 0);
1148 p += strlen(p) + 1;
1149
1150 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1151 loclen, 0, 0, 1, 0);
1152 p += strlen(p) + 1;
1153 }
1154 fwritezero(align, ofile);
1155
1156 /*
1157 * Now output the sections.
1158 */
1159 elf_write_sections();
1160
1161 nasm_free(elf_sects);
1162 saa_free(symtab);
1163 }
1164
1165 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1166 {
1167 struct SAA *s = saa_init(1L);
1168 struct Symbol *sym;
1169 uint8_t entry[16], *p;
1170 int i;
1171
1172 *len = *local = 0;
1173
1174 /*
1175 * First, an all-zeros entry, required by the ELF spec.
1176 */
1177 saa_wbytes(s, NULL, 16L); /* null symbol table entry */
1178 *len += 16;
1179 (*local)++;
1180
1181 /*
1182 * Next, an entry for the file name.
1183 */
1184 p = entry;
1185 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1186 WRITELONG(p, 0); /* no value */
1187 WRITELONG(p, 0); /* no size either */
1188 WRITESHORT(p, STT_FILE); /* type FILE */
1189 WRITESHORT(p, SHN_ABS);
1190 saa_wbytes(s, entry, 16L);
1191 *len += 16;
1192 (*local)++;
1193
1194 /*
1195 * Now some standard symbols defining the segments, for relocation
1196 * purposes.
1197 */
1198 for (i = 1; i <= nsects; i++) {
1199 p = entry;
1200 WRITELONG(p, 0); /* no symbol name */
1201 WRITELONG(p, 0); /* offset zero */
1202 WRITELONG(p, 0); /* size zero */
1203 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1204 WRITESHORT(p, i); /* section id */
1205 saa_wbytes(s, entry, 16L);
1206 *len += 16;
1207 (*local)++;
1208 }
1209
1210 /*
1211 * Now the other local symbols.
1212 */
1213 saa_rewind(syms);
1214 while ((sym = saa_rstruct(syms))) {
1215 if (sym->type & SYM_GLOBAL)
1216 continue;
1217 p = entry;
1218 WRITELONG(p, sym->strpos);
1219 WRITELONG(p, sym->symv.key);
1220 WRITELONG(p, sym->size);
1221 WRITECHAR(p, sym->type); /* type and binding */
1222 WRITECHAR(p, sym->other); /* visibility */
1223 WRITESHORT(p, sym->section);
1224 saa_wbytes(s, entry, 16L);
1225 *len += 16;
1226 (*local)++;
1227 }
1228 /*
1229 * dwarf needs symbols for debug sections
1230 * which are relocation targets.
1231 */
1232 //*** fix for 32 bit
1233 if (of_elf32.current_dfmt == &df_dwarf) {
1234 dwarf_infosym = *local;
1235 p = entry;
1236 WRITELONG(p, 0); /* no symbol name */
1237 WRITELONG(p, (uint32_t) 0); /* offset zero */
1238 WRITELONG(p, (uint32_t) 0); /* size zero */
1239 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1240 WRITESHORT(p, sec_debug_info); /* section id */
1241 saa_wbytes(s, entry, 16L);
1242 *len += 16;
1243 (*local)++;
1244 dwarf_abbrevsym = *local;
1245 p = entry;
1246 WRITELONG(p, 0); /* no symbol name */
1247 WRITELONG(p, (uint32_t) 0); /* offset zero */
1248 WRITELONG(p, (uint32_t) 0); /* size zero */
1249 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1250 WRITESHORT(p, sec_debug_abbrev); /* section id */
1251 saa_wbytes(s, entry, 16L);
1252 *len += 16;
1253 (*local)++;
1254 dwarf_linesym = *local;
1255 p = entry;
1256 WRITELONG(p, 0); /* no symbol name */
1257 WRITELONG(p, (uint32_t) 0); /* offset zero */
1258 WRITELONG(p, (uint32_t) 0); /* size zero */
1259 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1260 WRITESHORT(p, sec_debug_line); /* section id */
1261 saa_wbytes(s, entry, 16L);
1262 *len += 16;
1263 (*local)++;
1264 }
1265
1266 /*
1267 * Now the global symbols.
1268 */
1269 saa_rewind(syms);
1270 while ((sym = saa_rstruct(syms))) {
1271 if (!(sym->type & SYM_GLOBAL))
1272 continue;
1273 p = entry;
1274 WRITELONG(p, sym->strpos);
1275 WRITELONG(p, sym->symv.key);
1276 WRITELONG(p, sym->size);
1277 WRITECHAR(p, sym->type); /* type and binding */
1278 WRITECHAR(p, sym->other); /* visibility */
1279 WRITESHORT(p, sym->section);
1280 saa_wbytes(s, entry, 16L);
1281 *len += 16;
1282 }
1283
1284 return s;
1285 }
1286
1287 static struct SAA *elf_build_reltab(int32_t *len, struct Reloc *r)
1288 {
1289 struct SAA *s;
1290 uint8_t *p, entry[8];
1291 int32_t global_offset;
1292
1293 if (!r)
1294 return NULL;
1295
1296 s = saa_init(1L);
1297 *len = 0;
1298
1299 /*
1300 * How to onvert from a global placeholder to a real symbol index;
1301 * the +2 refers to the two special entries, the null entry and
1302 * the filename entry.
1303 */
1304 global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
1305
1306 while (r) {
1307 int32_t sym = r->symbol;
1308
1309 /*
1310 * Create a real symbol index; the +2 refers to the two special
1311 * entries, the null entry and the filename entry.
1312 */
1313 if (sym >= GLOBAL_TEMP_BASE)
1314 sym += global_offset;
1315
1316 p = entry;
1317 WRITELONG(p, r->address);
1318 WRITELONG(p, (sym << 8) + r->type);
1319 saa_wbytes(s, entry, 8L);
1320 *len += 8;
1321
1322 r = r->next;
1323 }
1324
1325 return s;
1326 }
1327
1328 static void elf_section_header(int name, int type, int flags,
1329 void *data, bool is_saa, int32_t datalen,
1330 int link, int info, int align, int eltsize)
1331 {
1332 elf_sects[elf_nsect].data = data;
1333 elf_sects[elf_nsect].len = datalen;
1334 elf_sects[elf_nsect].is_saa = is_saa;
1335 elf_nsect++;
1336
1337 fwriteint32_t((int32_t)name, ofile);
1338 fwriteint32_t((int32_t)type, ofile);
1339 fwriteint32_t((int32_t)flags, ofile);
1340 fwriteint32_t(0L, ofile); /* no address, ever, in object files */
1341 fwriteint32_t(type == 0 ? 0L : elf_foffs, ofile);
1342 fwriteint32_t(datalen, ofile);
1343 if (data)
1344 elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1345 fwriteint32_t((int32_t)link, ofile);
1346 fwriteint32_t((int32_t)info, ofile);
1347 fwriteint32_t((int32_t)align, ofile);
1348 fwriteint32_t((int32_t)eltsize, ofile);
1349 }
1350
1351 static void elf_write_sections(void)
1352 {
1353 int i;
1354 for (i = 0; i < elf_nsect; i++)
1355 if (elf_sects[i].data) {
1356 int32_t len = elf_sects[i].len;
1357 int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1358 int32_t align = reallen - len;
1359 if (elf_sects[i].is_saa)
1360 saa_fpwrite(elf_sects[i].data, ofile);
1361 else
1362 fwrite(elf_sects[i].data, len, 1, ofile);
1363 fwritezero(align, ofile);
1364 }
1365 }
1366
1367 static void elf_sect_write(struct Section *sect,
1368 const uint8_t *data, uint32_t len)
1369 {
1370 saa_wbytes(sect->data, data, len);
1371 sect->len += len;
1372 }
1373
1374 static int32_t elf_segbase(int32_t segment)
1375 {
1376 return segment;
1377 }
1378
1379 static int elf_directive(enum directives directive, char *value, int pass)
1380 {
1381 bool err;
1382 int64_t n;
1383 char *p;
1384
1385 switch (directive) {
1386 case D_OSABI:
1387 if (pass == 2)
1388 return 1; /* ignore in pass 2 */
1389
1390 n = readnum(value, &err);
1391 if (err) {
1392 nasm_error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1393 return 1;
1394 }
1395 if (n < 0 || n > 255) {
1396 nasm_error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1397 return 1;
1398 }
1399 elf_osabi = n;
1400 elf_abiver = 0;
1401
1402 if ((p = strchr(value,',')) == NULL)
1403 return 1;
1404
1405 n = readnum(p+1, &err);
1406 if (err || n < 0 || n > 255) {
1407 nasm_error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1408 return 1;
1409 }
1410
1411 elf_abiver = n;
1412 return 1;
1413
1414 default:
1415 return 0;
1416 }
1417 }
1418
1419 static void elf_filename(char *inname, char *outname)
1420 {
1421 strcpy(elf_module, inname);
1422 standard_extension(inname, outname, ".o");
1423 }
1424
1425 extern macros_t elf_stdmac[];
1426
1427 static int elf_set_info(enum geninfo type, char **val)
1428 {
1429 (void)type;
1430 (void)val;
1431 return 0;
1432 }
1433 static struct dfmt df_dwarf = {
1434 "ELF32 (i386) dwarf debug format for Linux/Unix",
1435 "dwarf",
1436 dwarf32_init,
1437 dwarf32_linenum,
1438 debug32_deflabel,
1439 debug32_directive,
1440 debug32_typevalue,
1441 dwarf32_output,
1442 dwarf32_cleanup
1443 };
1444 static struct dfmt df_stabs = {
1445 "ELF32 (i386) stabs debug format for Linux/Unix",
1446 "stabs",
1447 null_debug_init,
1448 stabs32_linenum,
1449 debug32_deflabel,
1450 debug32_directive,
1451 debug32_typevalue,
1452 stabs32_output,
1453 stabs32_cleanup
1454 };
1455
1456 struct dfmt *elf32_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
1457
1458 struct ofmt of_elf32 = {
1459 "ELF32 (i386) object files (e.g. Linux)",
1460 "elf32",
1461 0,
1462 elf32_debugs_arr,
1463 &df_stabs,
1464 elf_stdmac,
1465 elf_init,
1466 elf_set_info,
1467 elf_out,
1468 elf_deflabel,
1469 elf_section_names,
1470 elf_segbase,
1471 elf_directive,
1472 elf_filename,
1473 elf_cleanup
1474 };
1475
1476 struct ofmt of_elf = {
1477 "ELF (short name for ELF32) ",
1478 "elf",
1479 0,
1480 elf32_debugs_arr,
1481 &df_stabs,
1482 elf_stdmac,
1483 elf_init_hack,
1484 elf_set_info,
1485 elf_out,
1486 elf_deflabel,
1487 elf_section_names,
1488 elf_segbase,
1489 elf_directive,
1490 elf_filename,
1491 elf_cleanup
1492 };
1493 /* again, the stabs debugging stuff (code) */
1494
1495 static void stabs32_linenum(const char *filename, int32_t linenumber,
1496 int32_t segto)
1497 {
1498 (void)segto;
1499
1500 if (!stabs_filename) {
1501 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1502 strcpy(stabs_filename, filename);
1503 } else {
1504 if (strcmp(stabs_filename, filename)) {
1505 /*
1506 * yep, a memory leak...this program is one-shot anyway, so who cares...
1507 * in fact, this leak comes in quite handy to maintain a list of files
1508 * encountered so far in the symbol lines...
1509 */
1510
1511 /* why not nasm_free(stabs_filename); we're done with the old one */
1512
1513 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1514 strcpy(stabs_filename, filename);
1515 }
1516 }
1517 debug_immcall = 1;
1518 currentline = linenumber;
1519 }
1520
1521 static void debug32_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1522 char *special)
1523 {
1524 (void)name;
1525 (void)segment;
1526 (void)offset;
1527 (void)is_global;
1528 (void)special;
1529 }
1530
1531 static void debug32_directive(const char *directive, const char *params)
1532 {
1533 (void)directive;
1534 (void)params;
1535 }
1536
1537 static void debug32_typevalue(int32_t type)
1538 {
1539 int32_t stype, ssize;
1540 switch (TYM_TYPE(type)) {
1541 case TY_LABEL:
1542 ssize = 0;
1543 stype = STT_NOTYPE;
1544 break;
1545 case TY_BYTE:
1546 ssize = 1;
1547 stype = STT_OBJECT;
1548 break;
1549 case TY_WORD:
1550 ssize = 2;
1551 stype = STT_OBJECT;
1552 break;
1553 case TY_DWORD:
1554 ssize = 4;
1555 stype = STT_OBJECT;
1556 break;
1557 case TY_FLOAT:
1558 ssize = 4;
1559 stype = STT_OBJECT;
1560 break;
1561 case TY_QWORD:
1562 ssize = 8;
1563 stype = STT_OBJECT;
1564 break;
1565 case TY_TBYTE:
1566 ssize = 10;
1567 stype = STT_OBJECT;
1568 break;
1569 case TY_OWORD:
1570 ssize = 16;
1571 stype = STT_OBJECT;
1572 break;
1573 case TY_YWORD:
1574 ssize = 32;
1575 stype = STT_OBJECT;
1576 break;
1577 case TY_COMMON:
1578 ssize = 0;
1579 stype = STT_COMMON;
1580 break;
1581 case TY_SEG:
1582 ssize = 0;
1583 stype = STT_SECTION;
1584 break;
1585 case TY_EXTERN:
1586 ssize = 0;
1587 stype = STT_NOTYPE;
1588 break;
1589 case TY_EQU:
1590 ssize = 0;
1591 stype = STT_NOTYPE;
1592 break;
1593 default:
1594 ssize = 0;
1595 stype = STT_NOTYPE;
1596 break;
1597 }
1598 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1599 lastsym->size = ssize;
1600 lastsym->type = stype;
1601 }
1602 }
1603
1604 static void stabs32_output(int type, void *param)
1605 {
1606 struct symlininfo *s;
1607 struct linelist *el;
1608 if (type == TY_STABSSYMLIN) {
1609 if (debug_immcall) {
1610 s = (struct symlininfo *)param;
1611 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1612 return; /* we are only interested in the text stuff */
1613 numlinestabs++;
1614 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1615 el->info.offset = s->offset;
1616 el->info.section = s->section;
1617 el->info.name = s->name;
1618 el->line = currentline;
1619 el->filename = stabs_filename;
1620 el->next = 0;
1621 if (stabslines) {
1622 stabslines->last->next = el;
1623 stabslines->last = el;
1624 } else {
1625 stabslines = el;
1626 stabslines->last = el;
1627 }
1628 }
1629 }
1630 debug_immcall = 0;
1631 }
1632
1633 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
1634 do { \
1635 WRITELONG(p,n_strx); \
1636 WRITECHAR(p,n_type); \
1637 WRITECHAR(p,n_other); \
1638 WRITESHORT(p,n_desc); \
1639 WRITELONG(p,n_value); \
1640 } while (0)
1641
1642 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1643
1644 static void stabs32_generate(void)
1645 {
1646 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1647 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1648 char **allfiles;
1649 int *fileidx;
1650
1651 struct linelist *ptr;
1652
1653 ptr = stabslines;
1654
1655 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(char *));
1656 for (i = 0; i < numlinestabs; i++)
1657 allfiles[i] = 0;
1658 numfiles = 0;
1659 while (ptr) {
1660 if (numfiles == 0) {
1661 allfiles[0] = ptr->filename;
1662 numfiles++;
1663 } else {
1664 for (i = 0; i < numfiles; i++) {
1665 if (!strcmp(allfiles[i], ptr->filename))
1666 break;
1667 }
1668 if (i >= numfiles) {
1669 allfiles[i] = ptr->filename;
1670 numfiles++;
1671 }
1672 }
1673 ptr = ptr->next;
1674 }
1675 strsize = 1;
1676 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1677 for (i = 0; i < numfiles; i++) {
1678 fileidx[i] = strsize;
1679 strsize += strlen(allfiles[i]) + 1;
1680 }
1681 mainfileindex = 0;
1682 for (i = 0; i < numfiles; i++) {
1683 if (!strcmp(allfiles[i], elf_module)) {
1684 mainfileindex = i;
1685 break;
1686 }
1687 }
1688
1689 /*
1690 * worst case size of the stab buffer would be:
1691 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1692 * plus one "ending" entry
1693 */
1694 sbuf = (uint8_t *)nasm_malloc((numlinestabs * 2 + 4) *
1695 sizeof(struct stabentry));
1696 ssbuf = (uint8_t *)nasm_malloc(strsize);
1697 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3));
1698 rptr = rbuf;
1699
1700 for (i = 0; i < numfiles; i++)
1701 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1702 ssbuf[0] = 0;
1703
1704 stabstrlen = strsize; /* set global variable for length of stab strings */
1705
1706 sptr = sbuf;
1707 ptr = stabslines;
1708 numstabs = 0;
1709
1710 if (ptr) {
1711 /*
1712 * this is the first stab, its strx points to the filename of the
1713 * the source-file, the n_desc field should be set to the number
1714 * of remaining stabs
1715 */
1716 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1717
1718 /* this is the stab for the main source file */
1719 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1720
1721 /* relocation table entry */
1722
1723 /*
1724 * Since the symbol table has two entries before
1725 * the section symbols, the index in the info.section
1726 * member must be adjusted by adding 2
1727 */
1728
1729 WRITELONG(rptr, (sptr - sbuf) - 4);
1730 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1731
1732 numstabs++;
1733 currfile = mainfileindex;
1734 }
1735
1736 while (ptr) {
1737 if (strcmp(allfiles[currfile], ptr->filename)) {
1738 /* oops file has changed... */
1739 for (i = 0; i < numfiles; i++)
1740 if (!strcmp(allfiles[i], ptr->filename))
1741 break;
1742 currfile = i;
1743 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1744 ptr->info.offset);
1745 numstabs++;
1746
1747 /* relocation table entry */
1748 WRITELONG(rptr, (sptr - sbuf) - 4);
1749 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1750 }
1751
1752 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1753 numstabs++;
1754
1755 /* relocation table entry */
1756
1757 WRITELONG(rptr, (sptr - sbuf) - 4);
1758 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1759
1760 ptr = ptr->next;
1761
1762 }
1763
1764 /* this is an "ending" token */
1765 WRITE_STAB(sptr, 0, N_SO, 0, 0, 0);
1766 numstabs++;
1767
1768 ((struct stabentry *)sbuf)->n_desc = numstabs;
1769
1770 nasm_free(allfiles);
1771 nasm_free(fileidx);
1772
1773 stablen = (sptr - sbuf);
1774 stabrellen = (rptr - rbuf);
1775 stabrelbuf = rbuf;
1776 stabbuf = sbuf;
1777 stabstrbuf = ssbuf;
1778 }
1779
1780 static void stabs32_cleanup(void)
1781 {
1782 struct linelist *ptr, *del;
1783 if (!stabslines)
1784 return;
1785
1786 ptr = stabslines;
1787 while (ptr) {
1788 del = ptr;
1789 ptr = ptr->next;
1790 nasm_free(del);
1791 }
1792
1793 nasm_free(stabbuf);
1794 nasm_free(stabrelbuf);
1795 nasm_free(stabstrbuf);
1796 }
1797
1798 /* dwarf routines */
1799
1800 static void dwarf32_init(void)
1801 {
1802 ndebugs = 3; /* 3 debug symbols */
1803 }
1804
1805 static void dwarf32_linenum(const char *filename, int32_t linenumber,
1806 int32_t segto)
1807 {
1808 (void)segto;
1809 dwarf32_findfile(filename);
1810 debug_immcall = 1;
1811 currentline = linenumber;
1812 }
1813
1814 /* called from elf_out with type == TY_DEBUGSYMLIN */
1815 static void dwarf32_output(int type, void *param)
1816 {
1817 int ln, aa, inx, maxln, soc;
1818 struct symlininfo *s;
1819 struct SAA *plinep;
1820
1821 (void)type;
1822
1823 s = (struct symlininfo *)param;
1824
1825 /* line number info is only gathered for executable sections */
1826 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1827 return;
1828
1829 /* Check if section index has changed */
1830 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1831 dwarf32_findsect(s->section);
1832
1833 /* do nothing unless line or file has changed */
1834 if (!debug_immcall)
1835 return;
1836
1837 ln = currentline - dwarf_csect->line;
1838 aa = s->offset - dwarf_csect->offset;
1839 inx = dwarf_clist->line;
1840 plinep = dwarf_csect->psaa;
1841 /* check for file change */
1842 if (!(inx == dwarf_csect->file)) {
1843 saa_write8(plinep,DW_LNS_set_file);
1844 saa_write8(plinep,inx);
1845 dwarf_csect->file = inx;
1846 }
1847 /* check for line change */
1848 if (ln) {
1849 /* test if in range of special op code */
1850 maxln = line_base + line_range;
1851 soc = (ln - line_base) + (line_range * aa) + opcode_base;
1852 if (ln >= line_base && ln < maxln && soc < 256) {
1853 saa_write8(plinep,soc);
1854 } else {
1855 if (ln) {
1856 saa_write8(plinep,DW_LNS_advance_line);
1857 saa_wleb128s(plinep,ln);
1858 }
1859 if (aa) {
1860 saa_write8(plinep,DW_LNS_advance_pc);
1861 saa_wleb128u(plinep,aa);
1862 }
1863 }
1864 dwarf_csect->line = currentline;
1865 dwarf_csect->offset = s->offset;
1866 }
1867
1868 /* show change handled */
1869 debug_immcall = 0;
1870 }
1871
1872
1873 static void dwarf32_generate(void)
1874 {
1875 uint8_t *pbuf;
1876 int indx;
1877 struct linelist *ftentry;
1878 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
1879 struct SAA *parangesrel, *plinesrel, *pinforel;
1880 struct sectlist *psect;
1881 size_t saalen, linepoff, totlen, highaddr;
1882
1883 /* write epilogues for each line program range */
1884 /* and build aranges section */
1885 paranges = saa_init(1L);
1886 parangesrel = saa_init(1L);
1887 saa_write16(paranges,2); /* dwarf version */
1888 saa_write32(parangesrel, paranges->datalen+4);
1889 saa_write32(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
1890 saa_write32(parangesrel, 0);
1891 saa_write32(paranges,0); /* offset into info */
1892 saa_write8(paranges,4); /* pointer size */
1893 saa_write8(paranges,0); /* not segmented */
1894 saa_write32(paranges,0); /* padding */
1895 /* iterate though sectlist entries */
1896 psect = dwarf_fsect;
1897 totlen = 0;
1898 highaddr = 0;
1899 for (indx = 0; indx < dwarf_nsections; indx++) {
1900 plinep = psect->psaa;
1901 /* Line Number Program Epilogue */
1902 saa_write8(plinep,2); /* std op 2 */
1903 saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
1904 saa_write8(plinep,DW_LNS_extended_op);
1905 saa_write8(plinep,1); /* operand length */
1906 saa_write8(plinep,DW_LNE_end_sequence);
1907 totlen += plinep->datalen;
1908 /* range table relocation entry */
1909 saa_write32(parangesrel, paranges->datalen + 4);
1910 saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
1911 saa_write32(parangesrel, (uint32_t) 0);
1912 /* range table entry */
1913 saa_write32(paranges,0x0000); /* range start */
1914 saa_write32(paranges,sects[psect->section]->len); /* range length */
1915 highaddr += sects[psect->section]->len;
1916 /* done with this entry */
1917 psect = psect->next;
1918 }
1919 saa_write32(paranges,0); /* null address */
1920 saa_write32(paranges,0); /* null length */
1921 saalen = paranges->datalen;
1922 arangeslen = saalen + 4;
1923 arangesbuf = pbuf = nasm_malloc(arangeslen);
1924 WRITELONG(pbuf,saalen); /* initial length */
1925 saa_rnbytes(paranges, pbuf, saalen);
1926 saa_free(paranges);
1927
1928 /* build rela.aranges section */
1929 arangesrellen = saalen = parangesrel->datalen;
1930 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
1931 saa_rnbytes(parangesrel, pbuf, saalen);
1932 saa_free(parangesrel);
1933
1934 /* build pubnames section */
1935 ppubnames = saa_init(1L);
1936 saa_write16(ppubnames,3); /* dwarf version */
1937 saa_write32(ppubnames,0); /* offset into info */
1938 saa_write32(ppubnames,0); /* space used in info */
1939 saa_write32(ppubnames,0); /* end of list */
1940 saalen = ppubnames->datalen;
1941 pubnameslen = saalen + 4;
1942 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
1943 WRITELONG(pbuf,saalen); /* initial length */
1944 saa_rnbytes(ppubnames, pbuf, saalen);
1945 saa_free(ppubnames);
1946
1947 /* build info section */
1948 pinfo = saa_init(1L);
1949 pinforel = saa_init(1L);
1950 saa_write16(pinfo,2); /* dwarf version */
1951 saa_write32(pinforel, pinfo->datalen + 4);
1952 saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
1953 saa_write32(pinforel, 0);
1954 saa_write32(pinfo,0); /* offset into abbrev */
1955 saa_write8(pinfo,4); /* pointer size */
1956 saa_write8(pinfo,1); /* abbrviation number LEB128u */
1957 saa_write32(pinforel, pinfo->datalen + 4);
1958 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1959 saa_write32(pinforel, 0);
1960 saa_write32(pinfo,0); /* DW_AT_low_pc */
1961 saa_write32(pinforel, pinfo->datalen + 4);
1962 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1963 saa_write32(pinforel, 0);
1964 saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
1965 saa_write32(pinforel, pinfo->datalen + 4);
1966 saa_write32(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
1967 saa_write32(pinforel, 0);
1968 saa_write32(pinfo,0); /* DW_AT_stmt_list */
1969 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
1970 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
1971 saa_write16(pinfo,DW_LANG_Mips_Assembler);
1972 saa_write8(pinfo,2); /* abbrviation number LEB128u */
1973 saa_write32(pinforel, pinfo->datalen + 4);
1974 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1975 saa_write32(pinforel, 0);
1976 saa_write32(pinfo,0); /* DW_AT_low_pc */
1977 saa_write32(pinfo,0); /* DW_AT_frame_base */
1978 saa_write8(pinfo,0); /* end of entries */
1979 saalen = pinfo->datalen;
1980 infolen = saalen + 4;
1981 infobuf = pbuf = nasm_malloc(infolen);
1982 WRITELONG(pbuf,saalen); /* initial length */
1983 saa_rnbytes(pinfo, pbuf, saalen);
1984 saa_free(pinfo);
1985
1986 /* build rela.info section */
1987 inforellen = saalen = pinforel->datalen;
1988 inforelbuf = pbuf = nasm_malloc(inforellen);
1989 saa_rnbytes(pinforel, pbuf, saalen);
1990 saa_free(pinforel);
1991
1992 /* build abbrev section */
1993 pabbrev = saa_init(1L);
1994 saa_write8(pabbrev,1); /* entry number LEB128u */
1995 saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
1996 saa_write8(pabbrev,1); /* has children */
1997 /* the following attributes and forms are all LEB128u values */
1998 saa_write8(pabbrev,DW_AT_low_pc);
1999 saa_write8(pabbrev,DW_FORM_addr);
2000 saa_write8(pabbrev,DW_AT_high_pc);
2001 saa_write8(pabbrev,DW_FORM_addr);
2002 saa_write8(pabbrev,DW_AT_stmt_list);
2003 saa_write8(pabbrev,DW_FORM_data4);
2004 saa_write8(pabbrev,DW_AT_name);
2005 saa_write8(pabbrev,DW_FORM_string);
2006 saa_write8(pabbrev,DW_AT_producer);
2007 saa_write8(pabbrev,DW_FORM_string);
2008 saa_write8(pabbrev,DW_AT_language);
2009 saa_write8(pabbrev,DW_FORM_data2);
2010 saa_write16(pabbrev,0); /* end of entry */
2011 /* LEB128u usage same as above */
2012 saa_write8(pabbrev,2); /* entry number */
2013 saa_write8(pabbrev,DW_TAG_subprogram);
2014 saa_write8(pabbrev,0); /* no children */
2015 saa_write8(pabbrev,DW_AT_low_pc);
2016 saa_write8(pabbrev,DW_FORM_addr);
2017 saa_write8(pabbrev,DW_AT_frame_base);
2018 saa_write8(pabbrev,DW_FORM_data4);
2019 saa_write16(pabbrev,0); /* end of entry */
2020 abbrevlen = saalen = pabbrev->datalen;
2021 abbrevbuf = pbuf = nasm_malloc(saalen);
2022 saa_rnbytes(pabbrev, pbuf, saalen);
2023 saa_free(pabbrev);
2024
2025 /* build line section */
2026 /* prolog */
2027 plines = saa_init(1L);
2028 saa_write8(plines,1); /* Minimum Instruction Length */
2029 saa_write8(plines,1); /* Initial value of 'is_stmt' */
2030 saa_write8(plines,line_base); /* Line Base */
2031 saa_write8(plines,line_range); /* Line Range */
2032 saa_write8(plines,opcode_base); /* Opcode Base */
2033 /* standard opcode lengths (# of LEB128u operands) */
2034 saa_write8(plines,0); /* Std opcode 1 length */
2035 saa_write8(plines,1); /* Std opcode 2 length */
2036 saa_write8(plines,1); /* Std opcode 3 length */
2037 saa_write8(plines,1); /* Std opcode 4 length */
2038 saa_write8(plines,1); /* Std opcode 5 length */
2039 saa_write8(plines,0); /* Std opcode 6 length */
2040 saa_write8(plines,0); /* Std opcode 7 length */
2041 saa_write8(plines,0); /* Std opcode 8 length */
2042 saa_write8(plines,1); /* Std opcode 9 length */
2043 saa_write8(plines,0); /* Std opcode 10 length */
2044 saa_write8(plines,0); /* Std opcode 11 length */
2045 saa_write8(plines,1); /* Std opcode 12 length */
2046 /* Directory Table */
2047 saa_write8(plines,0); /* End of table */
2048 /* File Name Table */
2049 ftentry = dwarf_flist;
2050 for (indx = 0;indx<dwarf_numfiles;indx++) {
2051 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2052 saa_write8(plines,0); /* directory LEB128u */
2053 saa_write8(plines,0); /* time LEB128u */
2054 saa_write8(plines,0); /* size LEB128u */
2055 ftentry = ftentry->next;
2056 }
2057 saa_write8(plines,0); /* End of table */
2058 linepoff = plines->datalen;
2059 linelen = linepoff + totlen + 10;
2060 linebuf = pbuf = nasm_malloc(linelen);
2061 WRITELONG(pbuf,linelen-4); /* initial length */
2062 WRITESHORT(pbuf,3); /* dwarf version */
2063 WRITELONG(pbuf,linepoff); /* offset to line number program */
2064 /* write line header */
2065 saalen = linepoff;
2066 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2067 pbuf += linepoff;
2068 saa_free(plines);
2069 /* concatonate line program ranges */
2070 linepoff += 13;
2071 plinesrel = saa_init(1L);
2072 psect = dwarf_fsect;
2073 for (indx = 0; indx < dwarf_nsections; indx++) {
2074 saa_write32(plinesrel, linepoff);
2075 saa_write32(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
2076 saa_write32(plinesrel, (uint32_t) 0);
2077 plinep = psect->psaa;
2078 saalen = plinep->datalen;
2079 saa_rnbytes(plinep, pbuf, saalen);
2080 pbuf += saalen;
2081 linepoff += saalen;
2082 saa_free(plinep);
2083 /* done with this entry */
2084 psect = psect->next;
2085 }
2086
2087
2088 /* build rela.lines section */
2089 linerellen =saalen = plinesrel->datalen;
2090 linerelbuf = pbuf = nasm_malloc(linerellen);
2091 saa_rnbytes(plinesrel, pbuf, saalen);
2092 saa_free(plinesrel);
2093
2094 /* build frame section */
2095 framelen = 4;
2096 framebuf = pbuf = nasm_malloc(framelen);
2097 WRITELONG(pbuf,framelen-4); /* initial length */
2098
2099 /* build loc section */
2100 loclen = 16;
2101 locbuf = pbuf = nasm_malloc(loclen);
2102 WRITELONG(pbuf,0); /* null beginning offset */
2103 WRITELONG(pbuf,0); /* null ending offset */
2104 }
2105
2106 static void dwarf32_cleanup(void)
2107 {
2108 nasm_free(arangesbuf);
2109 nasm_free(arangesrelbuf);
2110 nasm_free(pubnamesbuf);
2111 nasm_free(infobuf);
2112 nasm_free(inforelbuf);
2113 nasm_free(abbrevbuf);
2114 nasm_free(linebuf);
2115 nasm_free(linerelbuf);
2116 nasm_free(framebuf);
2117 nasm_free(locbuf);
2118 }
2119
2120 static void dwarf32_findfile(const char * fname)
2121 {
2122 int finx;
2123 struct linelist *match;
2124
2125 /* return if fname is current file name */
2126 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename)))
2127 return;
2128
2129 /* search for match */
2130 match = 0;
2131 if (dwarf_flist) {
2132 match = dwarf_flist;
2133 for (finx = 0; finx < dwarf_numfiles; finx++) {
2134 if (!(strcmp(fname, match->filename))) {
2135 dwarf_clist = match;
2136 return;
2137 }
2138 }
2139 }
2140
2141 /* add file name to end of list */
2142 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2143 dwarf_numfiles++;
2144 dwarf_clist->line = dwarf_numfiles;
2145 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2146 strcpy(dwarf_clist->filename,fname);
2147 dwarf_clist->next = 0;
2148 if (!dwarf_flist) { /* if first entry */
2149 dwarf_flist = dwarf_elist = dwarf_clist;
2150 dwarf_clist->last = 0;
2151 } else { /* chain to previous entry */
2152 dwarf_elist->next = dwarf_clist;
2153 dwarf_elist = dwarf_clist;
2154 }
2155
2156 }
2157
2158 static void dwarf32_findsect(const int index)
2159 {
2160 int sinx;
2161 struct sectlist *match;
2162 struct SAA *plinep;
2163
2164 /* return if index is current section index */
2165 if (dwarf_csect && (dwarf_csect->section == index))
2166 return;
2167
2168 /* search for match */
2169 match = 0;
2170 if (dwarf_fsect) {
2171 match = dwarf_fsect;
2172 for (sinx = 0; sinx < dwarf_nsections; sinx++) {
2173 if ((match->section == index)) {
2174 dwarf_csect = match;
2175 return;
2176 }
2177 match = match->next;
2178 }
2179 }
2180
2181 /* add entry to end of list */
2182 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2183 dwarf_nsections++;
2184 dwarf_csect->psaa = plinep = saa_init(1L);
2185 dwarf_csect->line = 1;
2186 dwarf_csect->offset = 0;
2187 dwarf_csect->file = 1;
2188 dwarf_csect->section = index;
2189 dwarf_csect->next = 0;
2190 /* set relocatable address at start of line program */
2191 saa_write8(plinep,DW_LNS_extended_op);
2192 saa_write8(plinep,5); /* operand length */
2193 saa_write8(plinep,DW_LNE_set_address);
2194 saa_write32(plinep,0); /* Start Address */
2195
2196 if (!dwarf_fsect) { /* if first entry */
2197 dwarf_fsect = dwarf_esect = dwarf_csect;
2198 dwarf_csect->last = 0;
2199 } else { /* chain to previous entry */
2200 dwarf_esect->next = dwarf_csect;
2201 dwarf_esect = dwarf_csect;
2202 }
2203 }
2204
2205 #endif /* OF_ELF */
Adding AVX-512 features