1 /* ----------------------------------------------------------------------- *
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.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following
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.
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.
32 * ----------------------------------------------------------------------- */
35 * outelf32.c output routines for the Netwide Assembler to produce
36 * ELF32 (i386 of course) object file format
53 #include "output/outform.h"
54 #include "output/outlib.h"
57 #include "output/dwarf.h"
58 #include "output/elf.h"
59 #include "output/outelf.h"
68 int32_t address; /* relative to _start_ of section */
69 int32_t symbol; /* symbol index */
70 int type; /* type of relocation */
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 */
87 uint32_t len, size, nrelocs;
89 int type; /* SHT_PROGBITS or SHT_NOBITS */
90 uint32_t align; /* alignment: power of two */
91 uint32_t flags; /* section flags */
95 struct Reloc *head, **tail;
96 struct rbtree *gsyms; /* global symbols in section */
100 static struct Section **sects;
101 static int nsects, sectlen;
103 #define SHSTR_DELTA 256
104 static char *shstrtab;
105 static int shstrtablen, shstrtabsize;
107 static struct SAA *syms;
108 static uint32_t nlocals, nglobs, ndebugs; /* Symbol counts */
110 static int32_t def_seg;
112 static struct RAA *bsym;
114 static struct SAA *strs;
115 static uint32_t strslen;
117 static struct Symbol *fwds;
119 static char elf_module[FILENAME_MAX];
121 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
122 static uint8_t elf_abiver = 0; /* Current ABI version */
124 extern struct ofmt of_elf32;
125 extern struct ofmt of_elf;
127 #define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
129 static struct ELF_SECTDATA {
134 static int elf_nsect, nsections;
135 static int32_t elf_foffs;
137 static void elf_write(void);
138 static void elf_sect_write(struct Section *, const uint8_t *,
140 static void elf_section_header(int, int, int, void *, bool, int32_t, 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 *);
161 int section; /* section index */
162 char *name; /* shallow-copied pointer of section name */
166 struct symlininfo info;
169 struct linelist *next;
170 struct linelist *last;
179 struct sectlist *next;
180 struct sectlist *last;
183 /* common debug variables */
184 static int currentline = 1;
185 static int debug_immcall = 0;
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;
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;
205 static struct dfmt df_dwarf;
206 static struct dfmt df_stabs;
207 static struct Symbol *lastsym;
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 *);
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);
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);
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
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;
238 static void elf_init(void)
241 nsects = sectlen = 0;
242 syms = saa_init((int32_t)sizeof(struct Symbol));
243 nlocals = nglobs = ndebugs = 0;
246 saa_wbytes(strs, "\0", 1L);
247 saa_wbytes(strs, elf_module, strlen(elf_module)+1);
248 strslen = 2 + strlen(elf_module);
250 shstrtablen = shstrtabsize = 0;;
251 add_sectname("", "");
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);
268 def_seg = seg_alloc();
271 static void elf_init_hack(void)
273 of_elf32.current_dfmt = of_elf.current_dfmt; /* Sync debugging format */
277 static void elf_cleanup(int debuginfo)
285 for (i = 0; i < nsects; i++) {
286 if (sects[i]->type != SHT_NOBITS)
287 saa_free(sects[i]->data);
289 saa_free(sects[i]->rel);
290 while (sects[i]->head) {
292 sects[i]->head = sects[i]->head->next;
300 if (of_elf32.current_dfmt) {
301 of_elf32.current_dfmt->cleanup();
305 static void add_sectname(char *firsthalf, char *secondhalf)
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;
315 static int elf_make_section(char *name, int type, int flags, int align)
319 s = nasm_malloc(sizeof(*s));
321 if (type != SHT_NOBITS)
322 s->data = saa_init(1L);
325 s->len = s->size = 0;
327 if (!strcmp(name, ".text"))
330 s->index = seg_alloc();
331 add_sectname("", name);
332 s->name = nasm_malloc(1 + strlen(name));
333 strcpy(s->name, name);
339 if (nsects >= sectlen)
340 sects = nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
347 static int32_t elf_section_names(char *name, int pass, int *bits)
350 uint32_t flags, flags_and, flags_or;
355 * Default is 32 bits.
362 p = nasm_skip_word(name);
365 flags_and = flags_or = type = align = 0;
367 p = nasm_skip_spaces(p);
370 p = nasm_skip_word(p);
373 p = nasm_skip_spaces(p);
375 if (!nasm_strnicmp(q, "align=", 6)) {
379 if ((align - 1) & align) { /* means it's not a power of two */
380 nasm_error(ERR_NONFATAL, "section alignment %d is not"
381 " a power of two", align);
384 } else if (!nasm_stricmp(q, "alloc")) {
385 flags_and |= SHF_ALLOC;
386 flags_or |= SHF_ALLOC;
387 } else if (!nasm_stricmp(q, "noalloc")) {
388 flags_and |= SHF_ALLOC;
389 flags_or &= ~SHF_ALLOC;
390 } else if (!nasm_stricmp(q, "exec")) {
391 flags_and |= SHF_EXECINSTR;
392 flags_or |= SHF_EXECINSTR;
393 } else if (!nasm_stricmp(q, "noexec")) {
394 flags_and |= SHF_EXECINSTR;
395 flags_or &= ~SHF_EXECINSTR;
396 } else if (!nasm_stricmp(q, "write")) {
397 flags_and |= SHF_WRITE;
398 flags_or |= SHF_WRITE;
399 } else if (!nasm_stricmp(q, "tls")) {
400 flags_and |= SHF_TLS;
402 } else if (!nasm_stricmp(q, "nowrite")) {
403 flags_and |= SHF_WRITE;
404 flags_or &= ~SHF_WRITE;
405 } else if (!nasm_stricmp(q, "progbits")) {
407 } else if (!nasm_stricmp(q, "nobits")) {
409 } else if (pass == 1) {
410 nasm_error(ERR_WARNING, "Unknown section attribute '%s' ignored on"
411 " declaration of section `%s'", q, name);
415 if (!strcmp(name, ".shstrtab") ||
416 !strcmp(name, ".symtab") ||
417 !strcmp(name, ".strtab")) {
418 nasm_error(ERR_NONFATAL, "attempt to redefine reserved section"
423 for (i = 0; i < nsects; i++)
424 if (!strcmp(name, sects[i]->name))
427 const struct elf_known_section *ks = elf_known_sections;
430 if (!strcmp(name, ks->name))
435 type = type ? type : ks->type;
436 align = align ? align : ks->align;
437 flags = (ks->flags & ~flags_and) | flags_or;
439 i = elf_make_section(name, type, flags, align);
440 } else if (pass == 1) {
441 if ((type && sects[i]->type != type)
442 || (align && sects[i]->align != align)
443 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
444 nasm_error(ERR_WARNING, "section attributes ignored on"
445 " redeclaration of section `%s'", name);
448 return sects[i]->index;
451 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
452 int is_global, char *special)
456 bool special_used = false;
458 #if defined(DEBUG) && DEBUG>2
459 nasm_error(ERR_DEBUG,
460 " elf_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n",
461 name, segment, offset, is_global, special);
463 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
465 * This is a NASM special symbol. We never allow it into
466 * the ELF symbol table, even if it's a valid one. If it
467 * _isn't_ a valid one, we should barf immediately.
469 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
470 strcmp(name, "..got") && strcmp(name, "..plt") &&
471 strcmp(name, "..sym") && strcmp(name, "..tlsie"))
472 nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
476 if (is_global == 3) {
479 * Fix up a forward-reference symbol size from the first
482 for (s = &fwds; *s; s = &(*s)->nextfwd)
483 if (!strcmp((*s)->name, name)) {
484 struct tokenval tokval;
486 char *p = nasm_skip_spaces(nasm_skip_word(special));
490 tokval.t_type = TOKEN_INVALID;
491 e = evaluate(stdscan, NULL, &tokval, NULL, 1, nasm_error, NULL);
494 nasm_error(ERR_NONFATAL, "cannot use relocatable"
495 " expression as symbol size");
497 (*s)->size = reloc_value(e);
501 * Remove it from the list of unresolved sizes.
503 nasm_free((*s)->name);
507 return; /* it wasn't an important one */
510 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
511 strslen += 1 + strlen(name);
513 lastsym = sym = saa_wstruct(syms);
515 memset(&sym->symv, 0, sizeof(struct rbtree));
518 sym->type = is_global ? SYM_GLOBAL : 0;
519 sym->other = STV_DEFAULT;
521 if (segment == NO_SEG)
522 sym->section = SHN_ABS;
525 sym->section = SHN_UNDEF;
526 if (nsects == 0 && segment == def_seg) {
528 if (segment != elf_section_names(".text", 2, &tempint))
529 nasm_error(ERR_PANIC,
530 "strange segment conditions in ELF driver");
531 sym->section = nsects;
533 for (i = 0; i < nsects; i++)
534 if (segment == sects[i]->index) {
535 sym->section = i + 1;
541 if (is_global == 2) {
544 sym->section = SHN_COMMON;
546 * We have a common variable. Check the special text to see
547 * if it's a valid number and power of two; if so, store it
548 * as the alignment for the common variable.
552 sym->symv.key = readnum(special, &err);
554 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
555 " valid number", special);
556 else if ((sym->symv.key | (sym->symv.key - 1)) != 2 * sym->symv.key - 1)
557 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
558 " power of two", special);
562 sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
564 if (sym->type == SYM_GLOBAL) {
566 * If sym->section == SHN_ABS, then the first line of the
567 * else section would cause a core dump, because its a reference
568 * beyond the end of the section array.
569 * This behaviour is exhibited by this code:
572 * To avoid such a crash, such requests are silently discarded.
573 * This may not be the best solution.
575 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
576 bsym = raa_write(bsym, segment, nglobs);
577 } else if (sym->section != SHN_ABS) {
579 * This is a global symbol; so we must add it to the rbtree
580 * of global symbols in its section.
582 * In addition, we check the special text for symbol
583 * type and size information.
585 sects[sym->section-1]->gsyms =
586 rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
589 int n = strcspn(special, " \t");
591 if (!nasm_strnicmp(special, "function", n))
592 sym->type |= STT_FUNC;
593 else if (!nasm_strnicmp(special, "data", n) ||
594 !nasm_strnicmp(special, "object", n))
595 sym->type |= STT_OBJECT;
596 else if (!nasm_strnicmp(special, "notype", n))
597 sym->type |= STT_NOTYPE;
599 nasm_error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
603 special = nasm_skip_spaces(special);
605 n = strcspn(special, " \t");
606 if (!nasm_strnicmp(special, "default", n))
607 sym->other = STV_DEFAULT;
608 else if (!nasm_strnicmp(special, "internal", n))
609 sym->other = STV_INTERNAL;
610 else if (!nasm_strnicmp(special, "hidden", n))
611 sym->other = STV_HIDDEN;
612 else if (!nasm_strnicmp(special, "protected", n))
613 sym->other = STV_PROTECTED;
620 struct tokenval tokval;
623 char *saveme = stdscan_get();
625 while (special[n] && nasm_isspace(special[n]))
628 * We have a size expression; attempt to
632 stdscan_set(special + n);
633 tokval.t_type = TOKEN_INVALID;
634 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, nasm_error,
639 sym->name = nasm_strdup(name);
642 nasm_error(ERR_NONFATAL, "cannot use relocatable"
643 " expression as symbol size");
645 sym->size = reloc_value(e);
652 * If TLS segment, mark symbol accordingly.
654 if (sects[sym->section - 1]->flags & SHF_TLS) {
656 sym->type |= STT_TLS;
659 sym->globnum = nglobs;
664 if (special && !special_used)
665 nasm_error(ERR_NONFATAL, "no special symbol features supported here");
668 static void elf_add_reloc(struct Section *sect, int32_t segment, int type)
672 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
673 sect->tail = &r->next;
676 r->address = sect->len;
677 if (segment == NO_SEG)
682 for (i = 0; i < nsects; i++)
683 if (segment == sects[i]->index)
686 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
694 * This routine deals with ..got and ..sym relocations: the more
695 * complicated kinds. In shared-library writing, some relocations
696 * with respect to global symbols must refer to the precise symbol
697 * rather than referring to an offset from the base of the section
698 * _containing_ the symbol. Such relocations call to this routine,
699 * which searches the symbol list for the symbol in question.
701 * R_386_GOT32 references require the _exact_ symbol address to be
702 * used; R_386_32 references can be at an offset from the symbol.
703 * The boolean argument `exact' tells us this.
705 * Return value is the adjusted value of `addr', having become an
706 * offset from the symbol rather than the section. Should always be
707 * zero when returning from an exact call.
709 * Limitation: if you define two symbols at the same place,
710 * confusion will occur.
712 * Inefficiency: we search, currently, using a linked list which
713 * isn't even necessarily sorted.
715 static int32_t elf_add_gsym_reloc(struct Section *sect,
716 int32_t segment, uint32_t offset,
717 int type, bool exact)
726 * First look up the segment/offset pair and find a global
727 * symbol corresponding to it. If it's not one of our segments,
728 * then it must be an external symbol, in which case we're fine
729 * doing a normal elf_add_reloc after first sanity-checking
730 * that the offset from the symbol is zero.
733 for (i = 0; i < nsects; i++)
734 if (segment == sects[i]->index) {
739 if (exact && offset != 0)
740 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
741 " for this reference");
743 elf_add_reloc(sect, segment, type);
747 srb = rb_search(s->gsyms, offset);
748 if (!srb || (exact && srb->key != offset)) {
749 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
750 " for this reference");
753 sym = container_of(srb, struct Symbol, symv);
755 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
756 sect->tail = &r->next;
759 r->address = sect->len;
760 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
765 return offset - sym->symv.key;
768 static void elf_out(int32_t segto, const void *data,
769 enum out_type type, uint64_t size,
770 int32_t segment, int32_t wrt)
774 uint8_t mydata[4], *p;
776 static struct symlininfo sinfo;
779 * handle absolute-assembly (structure definitions)
781 if (segto == NO_SEG) {
782 if (type != OUT_RESERVE)
783 nasm_error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
789 for (i = 0; i < nsects; i++)
790 if (segto == sects[i]->index) {
795 int tempint; /* ignored */
796 if (segto != elf_section_names(".text", 2, &tempint))
797 nasm_error(ERR_PANIC, "strange segment conditions in ELF driver");
799 s = sects[nsects - 1];
804 /* again some stabs debugging stuff */
805 if (of_elf32.current_dfmt) {
806 sinfo.offset = s->len;
808 sinfo.name = s->name;
809 of_elf32.current_dfmt->debug_output(TY_STABSSYMLIN, &sinfo);
811 /* end of debugging stuff */
813 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
814 nasm_error(ERR_WARNING, "attempt to initialize memory in"
815 " BSS section `%s': ignored", s->name);
816 s->len += realsize(type, size);
820 if (type == OUT_RESERVE) {
821 if (s->type == SHT_PROGBITS) {
822 nasm_error(ERR_WARNING, "uninitialized space declared in"
823 " non-BSS section `%s': zeroing", s->name);
824 elf_sect_write(s, NULL, size);
827 } else if (type == OUT_RAWDATA) {
828 if (segment != NO_SEG)
829 nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
830 elf_sect_write(s, data, size);
831 } else if (type == OUT_ADDRESS) {
833 addr = *(int64_t *)data;
834 if (segment != NO_SEG) {
836 nasm_error(ERR_NONFATAL, "ELF format does not support"
837 " segment base references");
842 elf_add_reloc(s, segment, R_386_16);
844 elf_add_reloc(s, segment, R_386_32);
846 } else if (wrt == elf_gotpc_sect + 1) {
848 * The user will supply GOT relative to $$. ELF
849 * will let us have GOT relative to $. So we
850 * need to fix up the data item by $-$$.
853 elf_add_reloc(s, segment, R_386_GOTPC);
854 } else if (wrt == elf_gotoff_sect + 1) {
855 elf_add_reloc(s, segment, R_386_GOTOFF);
856 } else if (wrt == elf_tlsie_sect + 1) {
857 addr = elf_add_gsym_reloc(s, segment, addr,
859 } else if (wrt == elf_got_sect + 1) {
860 addr = elf_add_gsym_reloc(s, segment, addr,
862 } else if (wrt == elf_sym_sect + 1) {
865 addr = elf_add_gsym_reloc(s, segment, addr,
868 addr = elf_add_gsym_reloc(s, segment, addr,
871 } else if (wrt == elf_plt_sect + 1) {
872 nasm_error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
873 "relative PLT references");
875 nasm_error(ERR_NONFATAL, "ELF format does not support this"
877 wrt = NO_SEG; /* we can at least _try_ to continue */
883 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
884 "16-bit relocations in ELF is a GNU extension");
887 if (size != 4 && segment != NO_SEG) {
888 nasm_error(ERR_NONFATAL,
889 "Unsupported non-32-bit ELF relocation");
893 elf_sect_write(s, mydata, size);
894 } else if (type == OUT_REL2ADR) {
895 if (segment == segto)
896 nasm_error(ERR_PANIC, "intra-segment OUT_REL2ADR");
897 if (segment != NO_SEG && segment % 2) {
898 nasm_error(ERR_NONFATAL, "ELF format does not support"
899 " segment base references");
902 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
903 "16-bit relocations in ELF is a GNU extension");
904 elf_add_reloc(s, segment, R_386_PC16);
906 nasm_error(ERR_NONFATAL,
907 "Unsupported non-32-bit ELF relocation");
911 WRITESHORT(p, *(int64_t *)data - size);
912 elf_sect_write(s, mydata, 2L);
913 } else if (type == OUT_REL4ADR) {
914 if (segment == segto)
915 nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR");
916 if (segment != NO_SEG && segment % 2) {
917 nasm_error(ERR_NONFATAL, "ELF format does not support"
918 " segment base references");
921 elf_add_reloc(s, segment, R_386_PC32);
922 } else if (wrt == elf_plt_sect + 1) {
923 elf_add_reloc(s, segment, R_386_PLT32);
924 } else if (wrt == elf_gotpc_sect + 1 ||
925 wrt == elf_gotoff_sect + 1 ||
926 wrt == elf_got_sect + 1) {
927 nasm_error(ERR_NONFATAL, "ELF format cannot produce PC-"
928 "relative GOT references");
930 nasm_error(ERR_NONFATAL, "ELF format does not support this"
932 wrt = NO_SEG; /* we can at least _try_ to continue */
936 WRITELONG(p, *(int64_t *)data - size);
937 elf_sect_write(s, mydata, 4L);
941 static void elf_write(void)
948 int32_t symtablen, symtablocal;
951 * Work out how many sections we will have. We have SHN_UNDEF,
952 * then the flexible user sections, then the fixed sections
953 * `.shstrtab', `.symtab' and `.strtab', then optionally
954 * relocation sections for the user sections.
956 nsections = sec_numspecial + 1;
957 if (of_elf32.current_dfmt == &df_stabs)
959 else if (of_elf32.current_dfmt == &df_dwarf)
962 add_sectname("", ".shstrtab");
963 add_sectname("", ".symtab");
964 add_sectname("", ".strtab");
965 for (i = 0; i < nsects; i++) {
966 nsections++; /* for the section itself */
967 if (sects[i]->head) {
968 nsections++; /* for its relocations */
969 add_sectname(".rel", sects[i]->name);
973 if (of_elf32.current_dfmt == &df_stabs) {
974 /* in case the debug information is wanted, just add these three sections... */
975 add_sectname("", ".stab");
976 add_sectname("", ".stabstr");
977 add_sectname(".rel", ".stab");
978 } else if (of_elf32.current_dfmt == &df_dwarf) {
979 /* the dwarf debug standard specifies the following ten sections,
980 not all of which are currently implemented,
981 although all of them are defined. */
982 add_sectname("", ".debug_aranges");
983 add_sectname(".rela", ".debug_aranges");
984 add_sectname("", ".debug_pubnames");
985 add_sectname("", ".debug_info");
986 add_sectname(".rela", ".debug_info");
987 add_sectname("", ".debug_abbrev");
988 add_sectname("", ".debug_line");
989 add_sectname(".rela", ".debug_line");
990 add_sectname("", ".debug_frame");
991 add_sectname("", ".debug_loc");
995 * Output the ELF header.
997 fwrite("\177ELF\1\1\1", 7, 1, ofile);
998 fputc(elf_osabi, ofile);
999 fputc(elf_abiver, ofile);
1000 fwritezero(7, ofile);
1001 fwriteint16_t(1, ofile); /* ET_REL relocatable file */
1002 fwriteint16_t(3, ofile); /* EM_386 processor ID */
1003 fwriteint32_t(1L, ofile); /* EV_CURRENT file format version */
1004 fwriteint32_t(0L, ofile); /* no entry point */
1005 fwriteint32_t(0L, ofile); /* no program header table */
1006 fwriteint32_t(0x40L, ofile); /* section headers straight after
1007 * ELF header plus alignment */
1008 fwriteint32_t(0L, ofile); /* 386 defines no special flags */
1009 fwriteint16_t(0x34, ofile); /* size of ELF header */
1010 fwriteint16_t(0, ofile); /* no program header table, again */
1011 fwriteint16_t(0, ofile); /* still no program header table */
1012 fwriteint16_t(0x28, ofile); /* size of section header */
1013 fwriteint16_t(nsections, ofile); /* number of sections */
1014 fwriteint16_t(sec_shstrtab, ofile); /* string table section index for
1015 * section header table */
1016 fwriteint32_t(0L, ofile); /* align to 0x40 bytes */
1017 fwriteint32_t(0L, ofile);
1018 fwriteint32_t(0L, ofile);
1021 * Build the symbol table and relocation tables.
1023 symtab = elf_build_symtab(&symtablen, &symtablocal);
1024 for (i = 0; i < nsects; i++)
1026 sects[i]->rel = elf_build_reltab(§s[i]->rellen,
1030 * Now output the section header table.
1033 elf_foffs = 0x40 + 0x28 * nsections;
1034 align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
1037 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1040 elf_section_header(0, SHT_NULL, 0, NULL, false, 0, SHN_UNDEF, 0, 0, 0);
1043 /* The normal sections */
1044 for (i = 0; i < nsects; i++) {
1045 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1046 (sects[i]->type == SHT_PROGBITS ?
1047 sects[i]->data : NULL), true,
1048 sects[i]->len, 0, 0, sects[i]->align, 0);
1053 elf_section_header(p - shstrtab, SHT_STRTAB, 0, shstrtab, false,
1054 shstrtablen, 0, 0, 1, 0);
1058 elf_section_header(p - shstrtab, SHT_SYMTAB, 0, symtab, true,
1059 symtablen, sec_strtab, symtablocal, 4, 16);
1063 elf_section_header(p - shstrtab, SHT_STRTAB, 0, strs, true,
1064 strslen, 0, 0, 1, 0);
1067 /* The relocation sections */
1068 for (i = 0; i < nsects; i++)
1069 if (sects[i]->head) {
1070 elf_section_header(p - shstrtab, SHT_REL, 0, sects[i]->rel, true,
1071 sects[i]->rellen, sec_symtab, i + 1, 4, 8);
1075 if (of_elf32.current_dfmt == &df_stabs) {
1076 /* for debugging information, create the last three sections
1077 which are the .stab , .stabstr and .rel.stab sections respectively */
1079 /* this function call creates the stab sections in memory */
1082 if (stabbuf && stabstrbuf && stabrelbuf) {
1083 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, stabbuf, false,
1084 stablen, sec_stabstr, 0, 4, 12);
1087 elf_section_header(p - shstrtab, SHT_STRTAB, 0, stabstrbuf, false,
1088 stabstrlen, 0, 0, 4, 0);
1091 /* link -> symtable info -> section to refer to */
1092 elf_section_header(p - shstrtab, SHT_REL, 0, stabrelbuf, false,
1093 stabrellen, sec_symtab, sec_stab, 4, 8);
1096 } else if (of_elf32.current_dfmt == &df_dwarf) {
1097 /* for dwarf debugging information, create the ten dwarf sections */
1099 /* this function call creates the dwarf sections in memory */
1103 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1104 arangeslen, 0, 0, 1, 0);
1107 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1108 arangesrellen, sec_symtab, sec_debug_aranges,
1112 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf,
1113 false, pubnameslen, 0, 0, 1, 0);
1116 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1117 infolen, 0, 0, 1, 0);
1120 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1121 inforellen, sec_symtab, sec_debug_info, 1, 12);
1124 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1125 abbrevlen, 0, 0, 1, 0);
1128 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1129 linelen, 0, 0, 1, 0);
1132 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1133 linerellen, sec_symtab, sec_debug_line, 1, 12);
1136 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1137 framelen, 0, 0, 8, 0);
1140 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1141 loclen, 0, 0, 1, 0);
1144 fwritezero(align, ofile);
1147 * Now output the sections.
1149 elf_write_sections();
1151 nasm_free(elf_sects);
1155 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1157 struct SAA *s = saa_init(1L);
1159 uint8_t entry[16], *p;
1165 * First, an all-zeros entry, required by the ELF spec.
1167 saa_wbytes(s, NULL, 16L); /* null symbol table entry */
1172 * Next, an entry for the file name.
1175 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1176 WRITELONG(p, 0); /* no value */
1177 WRITELONG(p, 0); /* no size either */
1178 WRITESHORT(p, STT_FILE); /* type FILE */
1179 WRITESHORT(p, SHN_ABS);
1180 saa_wbytes(s, entry, 16L);
1185 * Now some standard symbols defining the segments, for relocation
1188 for (i = 1; i <= nsects; i++) {
1190 WRITELONG(p, 0); /* no symbol name */
1191 WRITELONG(p, 0); /* offset zero */
1192 WRITELONG(p, 0); /* size zero */
1193 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1194 WRITESHORT(p, i); /* section id */
1195 saa_wbytes(s, entry, 16L);
1201 * Now the other local symbols.
1204 while ((sym = saa_rstruct(syms))) {
1205 if (sym->type & SYM_GLOBAL)
1208 WRITELONG(p, sym->strpos);
1209 WRITELONG(p, sym->symv.key);
1210 WRITELONG(p, sym->size);
1211 WRITECHAR(p, sym->type); /* type and binding */
1212 WRITECHAR(p, sym->other); /* visibility */
1213 WRITESHORT(p, sym->section);
1214 saa_wbytes(s, entry, 16L);
1219 * dwarf needs symbols for debug sections
1220 * which are relocation targets.
1222 //*** fix for 32 bit
1223 if (of_elf32.current_dfmt == &df_dwarf) {
1224 dwarf_infosym = *local;
1226 WRITELONG(p, 0); /* no symbol name */
1227 WRITELONG(p, (uint32_t) 0); /* offset zero */
1228 WRITELONG(p, (uint32_t) 0); /* size zero */
1229 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1230 WRITESHORT(p, sec_debug_info); /* section id */
1231 saa_wbytes(s, entry, 16L);
1234 dwarf_abbrevsym = *local;
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_abbrev); /* section id */
1241 saa_wbytes(s, entry, 16L);
1244 dwarf_linesym = *local;
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_line); /* section id */
1251 saa_wbytes(s, entry, 16L);
1257 * Now the global symbols.
1260 while ((sym = saa_rstruct(syms))) {
1261 if (!(sym->type & SYM_GLOBAL))
1264 WRITELONG(p, sym->strpos);
1265 WRITELONG(p, sym->symv.key);
1266 WRITELONG(p, sym->size);
1267 WRITECHAR(p, sym->type); /* type and binding */
1268 WRITECHAR(p, sym->other); /* visibility */
1269 WRITESHORT(p, sym->section);
1270 saa_wbytes(s, entry, 16L);
1277 static struct SAA *elf_build_reltab(int32_t *len, struct Reloc *r)
1280 uint8_t *p, entry[8];
1281 int32_t global_offset;
1290 * How to onvert from a global placeholder to a real symbol index;
1291 * the +2 refers to the two special entries, the null entry and
1292 * the filename entry.
1294 global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
1297 int32_t sym = r->symbol;
1300 * Create a real symbol index; the +2 refers to the two special
1301 * entries, the null entry and the filename entry.
1303 if (sym >= GLOBAL_TEMP_BASE)
1304 sym += global_offset;
1307 WRITELONG(p, r->address);
1308 WRITELONG(p, (sym << 8) + r->type);
1309 saa_wbytes(s, entry, 8L);
1318 static void elf_section_header(int name, int type, int flags,
1319 void *data, bool is_saa, int32_t datalen,
1320 int link, int info, int align, int eltsize)
1322 elf_sects[elf_nsect].data = data;
1323 elf_sects[elf_nsect].len = datalen;
1324 elf_sects[elf_nsect].is_saa = is_saa;
1327 fwriteint32_t((int32_t)name, ofile);
1328 fwriteint32_t((int32_t)type, ofile);
1329 fwriteint32_t((int32_t)flags, ofile);
1330 fwriteint32_t(0L, ofile); /* no address, ever, in object files */
1331 fwriteint32_t(type == 0 ? 0L : elf_foffs, ofile);
1332 fwriteint32_t(datalen, ofile);
1334 elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1335 fwriteint32_t((int32_t)link, ofile);
1336 fwriteint32_t((int32_t)info, ofile);
1337 fwriteint32_t((int32_t)align, ofile);
1338 fwriteint32_t((int32_t)eltsize, ofile);
1341 static void elf_write_sections(void)
1344 for (i = 0; i < elf_nsect; i++)
1345 if (elf_sects[i].data) {
1346 int32_t len = elf_sects[i].len;
1347 int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1348 int32_t align = reallen - len;
1349 if (elf_sects[i].is_saa)
1350 saa_fpwrite(elf_sects[i].data, ofile);
1352 fwrite(elf_sects[i].data, len, 1, ofile);
1353 fwritezero(align, ofile);
1357 static void elf_sect_write(struct Section *sect,
1358 const uint8_t *data, uint32_t len)
1360 saa_wbytes(sect->data, data, len);
1364 static int32_t elf_segbase(int32_t segment)
1369 static int elf_directive(enum directives directive, char *value, int pass)
1375 switch (directive) {
1378 return 1; /* ignore in pass 2 */
1380 n = readnum(value, &err);
1382 nasm_error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1385 if (n < 0 || n > 255) {
1386 nasm_error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1392 if ((p = strchr(value,',')) == NULL)
1395 n = readnum(p+1, &err);
1396 if (err || n < 0 || n > 255) {
1397 nasm_error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1409 static void elf_filename(char *inname, char *outname)
1411 strcpy(elf_module, inname);
1412 standard_extension(inname, outname, ".o");
1415 extern macros_t elf_stdmac[];
1417 static int elf_set_info(enum geninfo type, char **val)
1423 static struct dfmt df_dwarf = {
1424 "ELF32 (i386) dwarf debug format for Linux/Unix",
1434 static struct dfmt df_stabs = {
1435 "ELF32 (i386) stabs debug format for Linux/Unix",
1446 struct dfmt *elf32_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
1448 struct ofmt of_elf32 = {
1449 "ELF32 (i386) object files (e.g. Linux)",
1466 struct ofmt of_elf = {
1467 "ELF (short name for ELF32) ",
1483 /* again, the stabs debugging stuff (code) */
1485 static void stabs32_linenum(const char *filename, int32_t linenumber,
1490 if (!stabs_filename) {
1491 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1492 strcpy(stabs_filename, filename);
1494 if (strcmp(stabs_filename, filename)) {
1496 * yep, a memory leak...this program is one-shot anyway, so who cares...
1497 * in fact, this leak comes in quite handy to maintain a list of files
1498 * encountered so far in the symbol lines...
1501 /* why not nasm_free(stabs_filename); we're done with the old one */
1503 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1504 strcpy(stabs_filename, filename);
1508 currentline = linenumber;
1511 static void debug32_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1521 static void debug32_directive(const char *directive, const char *params)
1527 static void debug32_typevalue(int32_t type)
1529 int32_t stype, ssize;
1530 switch (TYM_TYPE(type)) {
1573 stype = STT_SECTION;
1588 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1589 lastsym->size = ssize;
1590 lastsym->type = stype;
1594 static void stabs32_output(int type, void *param)
1596 struct symlininfo *s;
1597 struct linelist *el;
1598 if (type == TY_STABSSYMLIN) {
1599 if (debug_immcall) {
1600 s = (struct symlininfo *)param;
1601 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1602 return; /* we are only interested in the text stuff */
1604 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1605 el->info.offset = s->offset;
1606 el->info.section = s->section;
1607 el->info.name = s->name;
1608 el->line = currentline;
1609 el->filename = stabs_filename;
1612 stabslines->last->next = el;
1613 stabslines->last = el;
1616 stabslines->last = el;
1623 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
1625 WRITELONG(p,n_strx); \
1626 WRITECHAR(p,n_type); \
1627 WRITECHAR(p,n_other); \
1628 WRITESHORT(p,n_desc); \
1629 WRITELONG(p,n_value); \
1632 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1634 static void stabs32_generate(void)
1636 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1637 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1641 struct linelist *ptr;
1645 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(char *));
1646 for (i = 0; i < numlinestabs; i++)
1650 if (numfiles == 0) {
1651 allfiles[0] = ptr->filename;
1654 for (i = 0; i < numfiles; i++) {
1655 if (!strcmp(allfiles[i], ptr->filename))
1658 if (i >= numfiles) {
1659 allfiles[i] = ptr->filename;
1666 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1667 for (i = 0; i < numfiles; i++) {
1668 fileidx[i] = strsize;
1669 strsize += strlen(allfiles[i]) + 1;
1672 for (i = 0; i < numfiles; i++) {
1673 if (!strcmp(allfiles[i], elf_module)) {
1680 * worst case size of the stab buffer would be:
1681 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1682 * plus one "ending" entry
1684 sbuf = (uint8_t *)nasm_malloc((numlinestabs * 2 + 4) *
1685 sizeof(struct stabentry));
1686 ssbuf = (uint8_t *)nasm_malloc(strsize);
1687 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3));
1690 for (i = 0; i < numfiles; i++)
1691 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1694 stabstrlen = strsize; /* set global variable for length of stab strings */
1702 * this is the first stab, its strx points to the filename of the
1703 * the source-file, the n_desc field should be set to the number
1704 * of remaining stabs
1706 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1708 /* this is the stab for the main source file */
1709 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1711 /* relocation table entry */
1714 * Since the symbol table has two entries before
1715 * the section symbols, the index in the info.section
1716 * member must be adjusted by adding 2
1719 WRITELONG(rptr, (sptr - sbuf) - 4);
1720 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1723 currfile = mainfileindex;
1727 if (strcmp(allfiles[currfile], ptr->filename)) {
1728 /* oops file has changed... */
1729 for (i = 0; i < numfiles; i++)
1730 if (!strcmp(allfiles[i], ptr->filename))
1733 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1737 /* relocation table entry */
1738 WRITELONG(rptr, (sptr - sbuf) - 4);
1739 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1742 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1745 /* relocation table entry */
1747 WRITELONG(rptr, (sptr - sbuf) - 4);
1748 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1754 /* this is an "ending" token */
1755 WRITE_STAB(sptr, 0, N_SO, 0, 0, 0);
1758 ((struct stabentry *)sbuf)->n_desc = numstabs;
1760 nasm_free(allfiles);
1763 stablen = (sptr - sbuf);
1764 stabrellen = (rptr - rbuf);
1770 static void stabs32_cleanup(void)
1772 struct linelist *ptr, *del;
1784 nasm_free(stabrelbuf);
1785 nasm_free(stabstrbuf);
1788 /* dwarf routines */
1790 static void dwarf32_init(void)
1792 ndebugs = 3; /* 3 debug symbols */
1795 static void dwarf32_linenum(const char *filename, int32_t linenumber,
1799 dwarf32_findfile(filename);
1801 currentline = linenumber;
1804 /* called from elf_out with type == TY_DEBUGSYMLIN */
1805 static void dwarf32_output(int type, void *param)
1807 int ln, aa, inx, maxln, soc;
1808 struct symlininfo *s;
1813 s = (struct symlininfo *)param;
1815 /* line number info is only gathered for executable sections */
1816 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1819 /* Check if section index has changed */
1820 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1821 dwarf32_findsect(s->section);
1823 /* do nothing unless line or file has changed */
1827 ln = currentline - dwarf_csect->line;
1828 aa = s->offset - dwarf_csect->offset;
1829 inx = dwarf_clist->line;
1830 plinep = dwarf_csect->psaa;
1831 /* check for file change */
1832 if (!(inx == dwarf_csect->file)) {
1833 saa_write8(plinep,DW_LNS_set_file);
1834 saa_write8(plinep,inx);
1835 dwarf_csect->file = inx;
1837 /* check for line change */
1839 /* test if in range of special op code */
1840 maxln = line_base + line_range;
1841 soc = (ln - line_base) + (line_range * aa) + opcode_base;
1842 if (ln >= line_base && ln < maxln && soc < 256) {
1843 saa_write8(plinep,soc);
1846 saa_write8(plinep,DW_LNS_advance_line);
1847 saa_wleb128s(plinep,ln);
1850 saa_write8(plinep,DW_LNS_advance_pc);
1851 saa_wleb128u(plinep,aa);
1854 dwarf_csect->line = currentline;
1855 dwarf_csect->offset = s->offset;
1858 /* show change handled */
1863 static void dwarf32_generate(void)
1867 struct linelist *ftentry;
1868 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
1869 struct SAA *parangesrel, *plinesrel, *pinforel;
1870 struct sectlist *psect;
1871 size_t saalen, linepoff, totlen, highaddr;
1873 /* write epilogues for each line program range */
1874 /* and build aranges section */
1875 paranges = saa_init(1L);
1876 parangesrel = saa_init(1L);
1877 saa_write16(paranges,2); /* dwarf version */
1878 saa_write32(parangesrel, paranges->datalen+4);
1879 saa_write32(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
1880 saa_write32(parangesrel, 0);
1881 saa_write32(paranges,0); /* offset into info */
1882 saa_write8(paranges,4); /* pointer size */
1883 saa_write8(paranges,0); /* not segmented */
1884 saa_write32(paranges,0); /* padding */
1885 /* iterate though sectlist entries */
1886 psect = dwarf_fsect;
1889 for (indx = 0; indx < dwarf_nsections; indx++) {
1890 plinep = psect->psaa;
1891 /* Line Number Program Epilogue */
1892 saa_write8(plinep,2); /* std op 2 */
1893 saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
1894 saa_write8(plinep,DW_LNS_extended_op);
1895 saa_write8(plinep,1); /* operand length */
1896 saa_write8(plinep,DW_LNE_end_sequence);
1897 totlen += plinep->datalen;
1898 /* range table relocation entry */
1899 saa_write32(parangesrel, paranges->datalen + 4);
1900 saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
1901 saa_write32(parangesrel, (uint32_t) 0);
1902 /* range table entry */
1903 saa_write32(paranges,0x0000); /* range start */
1904 saa_write32(paranges,sects[psect->section]->len); /* range length */
1905 highaddr += sects[psect->section]->len;
1906 /* done with this entry */
1907 psect = psect->next;
1909 saa_write32(paranges,0); /* null address */
1910 saa_write32(paranges,0); /* null length */
1911 saalen = paranges->datalen;
1912 arangeslen = saalen + 4;
1913 arangesbuf = pbuf = nasm_malloc(arangeslen);
1914 WRITELONG(pbuf,saalen); /* initial length */
1915 saa_rnbytes(paranges, pbuf, saalen);
1918 /* build rela.aranges section */
1919 arangesrellen = saalen = parangesrel->datalen;
1920 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
1921 saa_rnbytes(parangesrel, pbuf, saalen);
1922 saa_free(parangesrel);
1924 /* build pubnames section */
1925 ppubnames = saa_init(1L);
1926 saa_write16(ppubnames,3); /* dwarf version */
1927 saa_write32(ppubnames,0); /* offset into info */
1928 saa_write32(ppubnames,0); /* space used in info */
1929 saa_write32(ppubnames,0); /* end of list */
1930 saalen = ppubnames->datalen;
1931 pubnameslen = saalen + 4;
1932 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
1933 WRITELONG(pbuf,saalen); /* initial length */
1934 saa_rnbytes(ppubnames, pbuf, saalen);
1935 saa_free(ppubnames);
1937 /* build info section */
1938 pinfo = saa_init(1L);
1939 pinforel = saa_init(1L);
1940 saa_write16(pinfo,2); /* dwarf version */
1941 saa_write32(pinforel, pinfo->datalen + 4);
1942 saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
1943 saa_write32(pinforel, 0);
1944 saa_write32(pinfo,0); /* offset into abbrev */
1945 saa_write8(pinfo,4); /* pointer size */
1946 saa_write8(pinfo,1); /* abbrviation number LEB128u */
1947 saa_write32(pinforel, pinfo->datalen + 4);
1948 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1949 saa_write32(pinforel, 0);
1950 saa_write32(pinfo,0); /* DW_AT_low_pc */
1951 saa_write32(pinforel, pinfo->datalen + 4);
1952 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1953 saa_write32(pinforel, 0);
1954 saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
1955 saa_write32(pinforel, pinfo->datalen + 4);
1956 saa_write32(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
1957 saa_write32(pinforel, 0);
1958 saa_write32(pinfo,0); /* DW_AT_stmt_list */
1959 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
1960 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
1961 saa_write16(pinfo,DW_LANG_Mips_Assembler);
1962 saa_write8(pinfo,2); /* abbrviation number LEB128u */
1963 saa_write32(pinforel, pinfo->datalen + 4);
1964 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1965 saa_write32(pinforel, 0);
1966 saa_write32(pinfo,0); /* DW_AT_low_pc */
1967 saa_write32(pinfo,0); /* DW_AT_frame_base */
1968 saa_write8(pinfo,0); /* end of entries */
1969 saalen = pinfo->datalen;
1970 infolen = saalen + 4;
1971 infobuf = pbuf = nasm_malloc(infolen);
1972 WRITELONG(pbuf,saalen); /* initial length */
1973 saa_rnbytes(pinfo, pbuf, saalen);
1976 /* build rela.info section */
1977 inforellen = saalen = pinforel->datalen;
1978 inforelbuf = pbuf = nasm_malloc(inforellen);
1979 saa_rnbytes(pinforel, pbuf, saalen);
1982 /* build abbrev section */
1983 pabbrev = saa_init(1L);
1984 saa_write8(pabbrev,1); /* entry number LEB128u */
1985 saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
1986 saa_write8(pabbrev,1); /* has children */
1987 /* the following attributes and forms are all LEB128u values */
1988 saa_write8(pabbrev,DW_AT_low_pc);
1989 saa_write8(pabbrev,DW_FORM_addr);
1990 saa_write8(pabbrev,DW_AT_high_pc);
1991 saa_write8(pabbrev,DW_FORM_addr);
1992 saa_write8(pabbrev,DW_AT_stmt_list);
1993 saa_write8(pabbrev,DW_FORM_data4);
1994 saa_write8(pabbrev,DW_AT_name);
1995 saa_write8(pabbrev,DW_FORM_string);
1996 saa_write8(pabbrev,DW_AT_producer);
1997 saa_write8(pabbrev,DW_FORM_string);
1998 saa_write8(pabbrev,DW_AT_language);
1999 saa_write8(pabbrev,DW_FORM_data2);
2000 saa_write16(pabbrev,0); /* end of entry */
2001 /* LEB128u usage same as above */
2002 saa_write8(pabbrev,2); /* entry number */
2003 saa_write8(pabbrev,DW_TAG_subprogram);
2004 saa_write8(pabbrev,0); /* no children */
2005 saa_write8(pabbrev,DW_AT_low_pc);
2006 saa_write8(pabbrev,DW_FORM_addr);
2007 saa_write8(pabbrev,DW_AT_frame_base);
2008 saa_write8(pabbrev,DW_FORM_data4);
2009 saa_write16(pabbrev,0); /* end of entry */
2010 abbrevlen = saalen = pabbrev->datalen;
2011 abbrevbuf = pbuf = nasm_malloc(saalen);
2012 saa_rnbytes(pabbrev, pbuf, saalen);
2015 /* build line section */
2017 plines = saa_init(1L);
2018 saa_write8(plines,1); /* Minimum Instruction Length */
2019 saa_write8(plines,1); /* Initial value of 'is_stmt' */
2020 saa_write8(plines,line_base); /* Line Base */
2021 saa_write8(plines,line_range); /* Line Range */
2022 saa_write8(plines,opcode_base); /* Opcode Base */
2023 /* standard opcode lengths (# of LEB128u operands) */
2024 saa_write8(plines,0); /* Std opcode 1 length */
2025 saa_write8(plines,1); /* Std opcode 2 length */
2026 saa_write8(plines,1); /* Std opcode 3 length */
2027 saa_write8(plines,1); /* Std opcode 4 length */
2028 saa_write8(plines,1); /* Std opcode 5 length */
2029 saa_write8(plines,0); /* Std opcode 6 length */
2030 saa_write8(plines,0); /* Std opcode 7 length */
2031 saa_write8(plines,0); /* Std opcode 8 length */
2032 saa_write8(plines,1); /* Std opcode 9 length */
2033 saa_write8(plines,0); /* Std opcode 10 length */
2034 saa_write8(plines,0); /* Std opcode 11 length */
2035 saa_write8(plines,1); /* Std opcode 12 length */
2036 /* Directory Table */
2037 saa_write8(plines,0); /* End of table */
2038 /* File Name Table */
2039 ftentry = dwarf_flist;
2040 for (indx = 0;indx<dwarf_numfiles;indx++) {
2041 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2042 saa_write8(plines,0); /* directory LEB128u */
2043 saa_write8(plines,0); /* time LEB128u */
2044 saa_write8(plines,0); /* size LEB128u */
2045 ftentry = ftentry->next;
2047 saa_write8(plines,0); /* End of table */
2048 linepoff = plines->datalen;
2049 linelen = linepoff + totlen + 10;
2050 linebuf = pbuf = nasm_malloc(linelen);
2051 WRITELONG(pbuf,linelen-4); /* initial length */
2052 WRITESHORT(pbuf,3); /* dwarf version */
2053 WRITELONG(pbuf,linepoff); /* offset to line number program */
2054 /* write line header */
2056 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2059 /* concatonate line program ranges */
2061 plinesrel = saa_init(1L);
2062 psect = dwarf_fsect;
2063 for (indx = 0; indx < dwarf_nsections; indx++) {
2064 saa_write32(plinesrel, linepoff);
2065 saa_write32(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
2066 saa_write32(plinesrel, (uint32_t) 0);
2067 plinep = psect->psaa;
2068 saalen = plinep->datalen;
2069 saa_rnbytes(plinep, pbuf, saalen);
2073 /* done with this entry */
2074 psect = psect->next;
2078 /* build rela.lines section */
2079 linerellen =saalen = plinesrel->datalen;
2080 linerelbuf = pbuf = nasm_malloc(linerellen);
2081 saa_rnbytes(plinesrel, pbuf, saalen);
2082 saa_free(plinesrel);
2084 /* build frame section */
2086 framebuf = pbuf = nasm_malloc(framelen);
2087 WRITELONG(pbuf,framelen-4); /* initial length */
2089 /* build loc section */
2091 locbuf = pbuf = nasm_malloc(loclen);
2092 WRITELONG(pbuf,0); /* null beginning offset */
2093 WRITELONG(pbuf,0); /* null ending offset */
2096 static void dwarf32_cleanup(void)
2098 nasm_free(arangesbuf);
2099 nasm_free(arangesrelbuf);
2100 nasm_free(pubnamesbuf);
2102 nasm_free(inforelbuf);
2103 nasm_free(abbrevbuf);
2105 nasm_free(linerelbuf);
2106 nasm_free(framebuf);
2110 static void dwarf32_findfile(const char * fname)
2113 struct linelist *match;
2115 /* return if fname is current file name */
2116 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename)))
2119 /* search for match */
2122 match = dwarf_flist;
2123 for (finx = 0; finx < dwarf_numfiles; finx++) {
2124 if (!(strcmp(fname, match->filename))) {
2125 dwarf_clist = match;
2131 /* add file name to end of list */
2132 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2134 dwarf_clist->line = dwarf_numfiles;
2135 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2136 strcpy(dwarf_clist->filename,fname);
2137 dwarf_clist->next = 0;
2138 if (!dwarf_flist) { /* if first entry */
2139 dwarf_flist = dwarf_elist = dwarf_clist;
2140 dwarf_clist->last = 0;
2141 } else { /* chain to previous entry */
2142 dwarf_elist->next = dwarf_clist;
2143 dwarf_elist = dwarf_clist;
2148 static void dwarf32_findsect(const int index)
2151 struct sectlist *match;
2154 /* return if index is current section index */
2155 if (dwarf_csect && (dwarf_csect->section == index))
2158 /* search for match */
2161 match = dwarf_fsect;
2162 for (sinx = 0; sinx < dwarf_nsections; sinx++) {
2163 if ((match->section == index)) {
2164 dwarf_csect = match;
2167 match = match->next;
2171 /* add entry to end of list */
2172 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2174 dwarf_csect->psaa = plinep = saa_init(1L);
2175 dwarf_csect->line = 1;
2176 dwarf_csect->offset = 0;
2177 dwarf_csect->file = 1;
2178 dwarf_csect->section = index;
2179 dwarf_csect->next = 0;
2180 /* set relocatable address at start of line program */
2181 saa_write8(plinep,DW_LNS_extended_op);
2182 saa_write8(plinep,5); /* operand length */
2183 saa_write8(plinep,DW_LNE_set_address);
2184 saa_write32(plinep,0); /* Start Address */
2186 if (!dwarf_fsect) { /* if first entry */
2187 dwarf_fsect = dwarf_esect = dwarf_csect;
2188 dwarf_csect->last = 0;
2189 } else { /* chain to previous entry */
2190 dwarf_esect->next = dwarf_csect;
2191 dwarf_esect = dwarf_csect;