1 /* outelf.c output routines for the Netwide Assembler to produce
2 * ELF32 (i386 of course) object file format
4 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
5 * Julian Hall. All rights reserved. The software is
6 * redistributable under the license given in the file "LICENSE"
7 * distributed in the NASM archive.
30 R_386_32 = 1, /* ordinary absolute relocation */
31 R_386_PC32 = 2, /* PC-relative relocation */
32 R_386_GOT32 = 3, /* an offset into GOT */
33 R_386_PLT32 = 4, /* a PC-relative offset into PLT */
34 R_386_COPY = 5, /* ??? */
35 R_386_GLOB_DAT = 6, /* ??? */
36 R_386_JUMP_SLOT = 7, /* ??? */
37 R_386_RELATIVE = 8, /* ??? */
38 R_386_GOTOFF = 9, /* an offset from GOT base */
39 R_386_GOTPC = 10, /* a PC-relative offset _to_ GOT */
40 /* These are GNU extensions, but useful */
41 R_386_16 = 20, /* A 16-bit absolute relocation */
42 R_386_PC16 = 21, /* A 16-bit PC-relative relocation */
43 R_386_8 = 22, /* An 8-bit absolute relocation */
44 R_386_PC8 = 23 /* An 8-bit PC-relative relocation */
49 int32_t address; /* relative to _start_ of section */
50 int32_t symbol; /* symbol index */
51 int type; /* type of relocation */
55 int32_t strpos; /* string table position of name */
56 int32_t section; /* section ID of the symbol */
57 int type; /* symbol type */
58 int other; /* symbol visibility */
59 int32_t value; /* address, or COMMON variable align */
60 int32_t size; /* size of symbol */
61 int32_t globnum; /* symbol table offset if global */
62 struct Symbol *next; /* list of globals in each section */
63 struct Symbol *nextfwd; /* list of unresolved-size symbols */
64 char *name; /* used temporarily if in above list */
67 #define SHT_PROGBITS 1
72 #define SHF_EXECINSTR 4
76 uint32_t len, size, nrelocs;
78 int type; /* SHT_PROGBITS or SHT_NOBITS */
79 int align; /* alignment: power of two */
80 uint32_t flags; /* section flags */
84 struct Reloc *head, **tail;
85 struct Symbol *gsyms; /* global symbols in section */
89 static struct Section **sects;
90 static int nsects, sectlen;
92 #define SHSTR_DELTA 256
93 static char *shstrtab;
94 static int shstrtablen, shstrtabsize;
96 static struct SAA *syms;
97 static uint32_t nlocals, nglobs;
99 static int32_t def_seg;
101 static struct RAA *bsym;
103 static struct SAA *strs;
104 static uint32_t strslen;
108 static evalfunc evaluate;
110 static struct Symbol *fwds;
112 static char elf_module[FILENAME_MAX];
114 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
115 static uint8_t elf_abiver = 0; /* Current ABI version */
117 extern struct ofmt of_elf32;
118 extern struct ofmt of_elf;
120 #define SHN_ABS 0xFFF1
121 #define SHN_COMMON 0xFFF2
124 #define SYM_GLOBAL 0x10
126 #define SHT_RELA 4 /* Relocation entries with addends */
128 #define STT_NOTYPE 0 /* Symbol type is unspecified */
129 #define STT_OBJECT 1 /* Symbol is a data object */
130 #define STT_FUNC 2 /* Symbol is a code object */
131 #define STT_SECTION 3 /* Symbol associated with a section */
132 #define STT_FILE 4 /* Symbol's name is file name */
133 #define STT_COMMON 5 /* Symbol is a common data object */
134 #define STT_TLS 6 /* Symbol is thread-local data object*/
135 #define STT_NUM 7 /* Number of defined types. */
137 #define STV_DEFAULT 0
138 #define STV_INTERNAL 1
140 #define STV_PROTECTED 3
142 #define GLOBAL_TEMP_BASE 1048576 /* bigger than any reasonable sym id */
144 #define SEG_ALIGN 16 /* alignment of sections in file */
145 #define SEG_ALIGN_1 (SEG_ALIGN-1)
147 /* Definitions in lieu of dwarf.h */
148 #define DW_TAG_compile_unit 0x11
149 #define DW_TAG_subprogram 0x2e
150 #define DW_AT_name 0x03
151 #define DW_AT_stmt_list 0x10
152 #define DW_AT_low_pc 0x11
153 #define DW_AT_high_pc 0x12
154 #define DW_AT_language 0x13
155 #define DW_AT_producer 0x25
156 #define DW_AT_frame_base 0x40
157 #define DW_FORM_addr 0x01
158 #define DW_FORM_data2 0x05
159 #define DW_FORM_data4 0x06
160 #define DW_FORM_string 0x08
161 #define DW_LNS_extended_op 0
162 #define DW_LNS_advance_pc 2
163 #define DW_LNS_advance_line 3
164 #define DW_LNS_set_file 4
165 #define DW_LNE_end_sequence 1
166 #define DW_LNE_set_address 2
167 #define DW_LNE_define_file 3
168 #define DW_LANG_Mips_Assembler 0x8001
170 #define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
172 static const char align_str[SEG_ALIGN] = ""; /* ANSI will pad this with 0s */
174 static struct ELF_SECTDATA {
179 static int elf_nsect, nsections;
180 static int32_t elf_foffs;
182 static void elf_write(void);
183 static void elf_sect_write(struct Section *, const uint8_t *,
185 static void elf_section_header(int, int, int, void *, bool, int32_t, int, int,
187 static void elf_write_sections(void);
188 static struct SAA *elf_build_symtab(int32_t *, int32_t *);
189 static struct SAA *elf_build_reltab(int32_t *, struct Reloc *);
190 static void add_sectname(char *, char *);
192 /* this stuff is needed for the stabs debugging format */
193 #define N_SO 0x64 /* ID for main source file */
194 #define N_SOL 0x84 /* ID for sub-source file */
198 #define TY_STABSSYMLIN 0x40 /* ouch */
214 int section; /* section index */
215 char *name; /* shallow-copied pointer of section name */
219 struct symlininfo info;
222 struct linelist *next;
223 struct linelist *last;
232 struct sectlist *next;
233 struct sectlist *last;
236 /* common debug variables */
237 static int currentline = 1;
238 static int debug_immcall = 0;
240 /* stabs debug variables */
241 static struct linelist *stabslines = 0;
242 static int numlinestabs = 0;
243 static char *stabs_filename = 0;
244 static int symtabsection;
245 static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
246 static int stablen, stabstrlen, stabrellen;
248 /* dwarf debug variables */
249 static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
250 static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
251 static int dwarf_numfiles = 0, dwarf_nsections;
252 static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
253 *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
254 static int8_t line_base = -5, line_range = 14, opcode_base = 13;
255 static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
256 abbrevlen, linelen, linerellen, framelen, loclen;
257 static int32_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
259 static struct dfmt df_dwarf;
260 static struct dfmt df_stabs;
261 static struct Symbol *lastsym;
263 /* common debugging routines */
264 void debug32_typevalue(int32_t);
265 void debug32_init(struct ofmt *, void *, FILE *, efunc);
266 void debug32_deflabel(char *, int32_t, int64_t, int, char *);
267 void debug32_directive(const char *, const char *);
269 /* stabs debugging routines */
270 void stabs32_linenum(const char *filename, int32_t linenumber, int32_t);
271 void stabs32_output(int, void *);
272 void stabs32_generate(void);
273 void stabs32_cleanup(void);
275 /* dwarf debugging routines */
276 void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t);
277 void dwarf32_output(int, void *);
278 void dwarf32_generate(void);
279 void dwarf32_cleanup(void);
280 void dwarf32_findfile(const char *);
281 void dwarf32_findsect(const int);
282 void saa_wleb128u(struct SAA *, int);
283 void saa_wleb128s(struct SAA *, int);
286 * Special section numbers which are used to define ELF special
287 * symbols, which can be used with WRT to provide PIC relocation
290 static int32_t elf_gotpc_sect, elf_gotoff_sect;
291 static int32_t elf_got_sect, elf_plt_sect;
292 static int32_t elf_sym_sect;
294 static void elf_init(FILE * fp, efunc errfunc, ldfunc ldef, evalfunc eval)
296 if (of_elf.current_dfmt != &null_debug_form)
297 of_elf32.current_dfmt = of_elf.current_dfmt;
301 (void)ldef; /* placate optimisers */
303 nsects = sectlen = 0;
304 syms = saa_init((int32_t)sizeof(struct Symbol));
305 nlocals = nglobs = 0;
308 saa_wbytes(strs, "\0", 1L);
309 saa_wbytes(strs, elf_module, strlen(elf_module)+1);
310 strslen = 2 + strlen(elf_module);
312 shstrtablen = shstrtabsize = 0;;
313 add_sectname("", "");
317 elf_gotpc_sect = seg_alloc();
318 ldef("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false, &of_elf32,
320 elf_gotoff_sect = seg_alloc();
321 ldef("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false, &of_elf32,
323 elf_got_sect = seg_alloc();
324 ldef("..got", elf_got_sect + 1, 0L, NULL, false, false, &of_elf32,
326 elf_plt_sect = seg_alloc();
327 ldef("..plt", elf_plt_sect + 1, 0L, NULL, false, false, &of_elf32,
329 elf_sym_sect = seg_alloc();
330 ldef("..sym", elf_sym_sect + 1, 0L, NULL, false, false, &of_elf32,
333 def_seg = seg_alloc();
336 static void elf_cleanup(int debuginfo)
345 for (i = 0; i < nsects; i++) {
346 if (sects[i]->type != SHT_NOBITS)
347 saa_free(sects[i]->data);
349 saa_free(sects[i]->rel);
350 while (sects[i]->head) {
352 sects[i]->head = sects[i]->head->next;
360 if (of_elf32.current_dfmt) {
361 of_elf32.current_dfmt->cleanup();
365 static void add_sectname(char *firsthalf, char *secondhalf)
367 int len = strlen(firsthalf) + strlen(secondhalf);
368 while (shstrtablen + len + 1 > shstrtabsize)
369 shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
370 strcpy(shstrtab + shstrtablen, firsthalf);
371 strcat(shstrtab + shstrtablen, secondhalf);
372 shstrtablen += len + 1;
375 static int elf_make_section(char *name, int type, int flags, int align)
379 s = nasm_malloc(sizeof(*s));
381 if (type != SHT_NOBITS)
382 s->data = saa_init(1L);
385 s->len = s->size = 0;
387 if (!strcmp(name, ".text"))
390 s->index = seg_alloc();
391 add_sectname("", name);
392 s->name = nasm_malloc(1 + strlen(name));
393 strcpy(s->name, name);
399 if (nsects >= sectlen)
401 nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
407 static int32_t elf_section_names(char *name, int pass, int *bits)
410 unsigned flags_and, flags_or;
414 * Default is 32 bits.
422 while (*p && !isspace(*p))
426 flags_and = flags_or = type = align = 0;
428 while (*p && isspace(*p))
432 while (*p && !isspace(*p))
436 while (*p && isspace(*p))
439 if (!nasm_strnicmp(q, "align=", 6)) {
443 if ((align - 1) & align) { /* means it's not a power of two */
444 error(ERR_NONFATAL, "section alignment %d is not"
445 " a power of two", align);
448 } else if (!nasm_stricmp(q, "alloc")) {
449 flags_and |= SHF_ALLOC;
450 flags_or |= SHF_ALLOC;
451 } else if (!nasm_stricmp(q, "noalloc")) {
452 flags_and |= SHF_ALLOC;
453 flags_or &= ~SHF_ALLOC;
454 } else if (!nasm_stricmp(q, "exec")) {
455 flags_and |= SHF_EXECINSTR;
456 flags_or |= SHF_EXECINSTR;
457 } else if (!nasm_stricmp(q, "noexec")) {
458 flags_and |= SHF_EXECINSTR;
459 flags_or &= ~SHF_EXECINSTR;
460 } else if (!nasm_stricmp(q, "write")) {
461 flags_and |= SHF_WRITE;
462 flags_or |= SHF_WRITE;
463 } else if (!nasm_stricmp(q, "nowrite")) {
464 flags_and |= SHF_WRITE;
465 flags_or &= ~SHF_WRITE;
466 } else if (!nasm_stricmp(q, "progbits")) {
468 } else if (!nasm_stricmp(q, "nobits")) {
473 if (!strcmp(name, ".comment") ||
474 !strcmp(name, ".shstrtab") ||
475 !strcmp(name, ".symtab") || !strcmp(name, ".strtab")) {
476 error(ERR_NONFATAL, "attempt to redefine reserved section"
481 for (i = 0; i < nsects; i++)
482 if (!strcmp(name, sects[i]->name))
485 if (!strcmp(name, ".text"))
486 i = elf_make_section(name, SHT_PROGBITS,
487 SHF_ALLOC | SHF_EXECINSTR, 16);
488 else if (!strcmp(name, ".rodata"))
489 i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 4);
490 else if (!strcmp(name, ".data"))
491 i = elf_make_section(name, SHT_PROGBITS,
492 SHF_ALLOC | SHF_WRITE, 4);
493 else if (!strcmp(name, ".bss"))
494 i = elf_make_section(name, SHT_NOBITS,
495 SHF_ALLOC | SHF_WRITE, 4);
497 i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 1);
499 sects[i]->type = type;
501 sects[i]->align = align;
502 sects[i]->flags &= ~flags_and;
503 sects[i]->flags |= flags_or;
504 } else if (pass == 1) {
505 if ((type && sects[i]->type != type)
506 || (align && sects[i]->align != align)
507 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
508 error(ERR_WARNING, "section attributes ignored on"
509 " redeclaration of section `%s'", name);
512 return sects[i]->index;
515 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
516 int is_global, char *special)
520 bool special_used = false;
522 #if defined(DEBUG) && DEBUG>2
524 " elf_deflabel: %s, seg=%ld, off=%ld, is_global=%d, %s\n",
525 name, segment, offset, is_global, special);
527 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
529 * This is a NASM special symbol. We never allow it into
530 * the ELF symbol table, even if it's a valid one. If it
531 * _isn't_ a valid one, we should barf immediately.
533 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
534 strcmp(name, "..got") && strcmp(name, "..plt") &&
535 strcmp(name, "..sym"))
536 error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
540 if (is_global == 3) {
543 * Fix up a forward-reference symbol size from the first
546 for (s = &fwds; *s; s = &(*s)->nextfwd)
547 if (!strcmp((*s)->name, name)) {
548 struct tokenval tokval;
552 while (*p && !isspace(*p))
554 while (*p && isspace(*p))
558 tokval.t_type = TOKEN_INVALID;
559 e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
562 error(ERR_NONFATAL, "cannot use relocatable"
563 " expression as symbol size");
565 (*s)->size = reloc_value(e);
569 * Remove it from the list of unresolved sizes.
571 nasm_free((*s)->name);
575 return; /* it wasn't an important one */
578 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
579 strslen += 1 + strlen(name);
581 lastsym = sym = saa_wstruct(syms);
584 sym->type = is_global ? SYM_GLOBAL : 0;
585 sym->other = STV_DEFAULT;
587 if (segment == NO_SEG)
588 sym->section = SHN_ABS;
591 sym->section = SHN_UNDEF;
592 if (nsects == 0 && segment == def_seg) {
594 if (segment != elf_section_names(".text", 2, &tempint))
596 "strange segment conditions in ELF driver");
597 sym->section = nsects;
599 for (i = 0; i < nsects; i++)
600 if (segment == sects[i]->index) {
601 sym->section = i + 1;
607 if (is_global == 2) {
610 sym->section = SHN_COMMON;
612 * We have a common variable. Check the special text to see
613 * if it's a valid number and power of two; if so, store it
614 * as the alignment for the common variable.
618 sym->value = readnum(special, &err);
620 error(ERR_NONFATAL, "alignment constraint `%s' is not a"
621 " valid number", special);
622 else if ((sym->value | (sym->value - 1)) != 2 * sym->value - 1)
623 error(ERR_NONFATAL, "alignment constraint `%s' is not a"
624 " power of two", special);
628 sym->value = (sym->section == SHN_UNDEF ? 0 : offset);
630 if (sym->type == SYM_GLOBAL) {
632 * If sym->section == SHN_ABS, then the first line of the
633 * else section would cause a core dump, because its a reference
634 * beyond the end of the section array.
635 * This behaviour is exhibited by this code:
638 * To avoid such a crash, such requests are silently discarded.
639 * This may not be the best solution.
641 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
642 bsym = raa_write(bsym, segment, nglobs);
643 } else if (sym->section != SHN_ABS) {
645 * This is a global symbol; so we must add it to the linked
646 * list of global symbols in its section. We'll push it on
647 * the beginning of the list, because it doesn't matter
648 * much which end we put it on and it's easier like this.
650 * In addition, we check the special text for symbol
651 * type and size information.
653 sym->next = sects[sym->section - 1]->gsyms;
654 sects[sym->section - 1]->gsyms = sym;
657 int n = strcspn(special, " \t");
659 if (!nasm_strnicmp(special, "function", n))
660 sym->type |= STT_FUNC;
661 else if (!nasm_strnicmp(special, "data", n) ||
662 !nasm_strnicmp(special, "object", n))
663 sym->type |= STT_OBJECT;
664 else if (!nasm_strnicmp(special, "notype", n))
665 sym->type |= STT_NOTYPE;
667 error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
671 while (isspace(*special))
674 n = strcspn(special, " \t");
675 if (!nasm_strnicmp(special, "default", n))
676 sym->other = STV_DEFAULT;
677 else if (!nasm_strnicmp(special, "internal", n))
678 sym->other = STV_INTERNAL;
679 else if (!nasm_strnicmp(special, "hidden", n))
680 sym->other = STV_HIDDEN;
681 else if (!nasm_strnicmp(special, "protected", n))
682 sym->other = STV_PROTECTED;
689 struct tokenval tokval;
692 char *saveme = stdscan_bufptr; /* bugfix? fbk 8/10/00 */
694 while (special[n] && isspace(special[n]))
697 * We have a size expression; attempt to
701 stdscan_bufptr = special + n;
702 tokval.t_type = TOKEN_INVALID;
703 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error,
708 sym->name = nasm_strdup(name);
711 error(ERR_NONFATAL, "cannot use relocatable"
712 " expression as symbol size");
714 sym->size = reloc_value(e);
716 stdscan_bufptr = saveme; /* bugfix? fbk 8/10/00 */
721 sym->globnum = nglobs;
726 if (special && !special_used)
727 error(ERR_NONFATAL, "no special symbol features supported here");
730 static void elf_add_reloc(struct Section *sect, int32_t segment, int type)
734 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
735 sect->tail = &r->next;
738 r->address = sect->len;
739 if (segment == NO_SEG)
744 for (i = 0; i < nsects; i++)
745 if (segment == sects[i]->index)
748 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
756 * This routine deals with ..got and ..sym relocations: the more
757 * complicated kinds. In shared-library writing, some relocations
758 * with respect to global symbols must refer to the precise symbol
759 * rather than referring to an offset from the base of the section
760 * _containing_ the symbol. Such relocations call to this routine,
761 * which searches the symbol list for the symbol in question.
763 * R_386_GOT32 references require the _exact_ symbol address to be
764 * used; R_386_32 references can be at an offset from the symbol.
765 * The boolean argument `exact' tells us this.
767 * Return value is the adjusted value of `addr', having become an
768 * offset from the symbol rather than the section. Should always be
769 * zero when returning from an exact call.
771 * Limitation: if you define two symbols at the same place,
772 * confusion will occur.
774 * Inefficiency: we search, currently, using a linked list which
775 * isn't even necessarily sorted.
777 static int32_t elf_add_gsym_reloc(struct Section *sect,
778 int32_t segment, int32_t offset,
779 int type, bool exact)
783 struct Symbol *sym, *sm;
787 * First look up the segment/offset pair and find a global
788 * symbol corresponding to it. If it's not one of our segments,
789 * then it must be an external symbol, in which case we're fine
790 * doing a normal elf_add_reloc after first sanity-checking
791 * that the offset from the symbol is zero.
794 for (i = 0; i < nsects; i++)
795 if (segment == sects[i]->index) {
800 if (exact && offset != 0)
801 error(ERR_NONFATAL, "unable to find a suitable global symbol"
802 " for this reference");
804 elf_add_reloc(sect, segment, type);
810 * Find a symbol pointing _exactly_ at this one.
812 for (sym = s->gsyms; sym; sym = sym->next)
813 if (sym->value == offset)
817 * Find the nearest symbol below this one.
820 for (sm = s->gsyms; sm; sm = sm->next)
821 if (sm->value <= offset && (!sym || sm->value > sym->value))
825 error(ERR_NONFATAL, "unable to find a suitable global symbol"
826 " for this reference");
830 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
831 sect->tail = &r->next;
834 r->address = sect->len;
835 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
840 return offset - sym->value;
843 static void elf_out(int32_t segto, const void *data,
844 enum out_type type, uint64_t size,
845 int32_t segment, int32_t wrt)
849 uint8_t mydata[4], *p;
851 static struct symlininfo sinfo;
854 * handle absolute-assembly (structure definitions)
856 if (segto == NO_SEG) {
857 if (type != OUT_RESERVE)
858 error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
864 for (i = 0; i < nsects; i++)
865 if (segto == sects[i]->index) {
870 int tempint; /* ignored */
871 if (segto != elf_section_names(".text", 2, &tempint))
872 error(ERR_PANIC, "strange segment conditions in ELF driver");
874 s = sects[nsects - 1];
879 /* again some stabs debugging stuff */
880 if (of_elf32.current_dfmt) {
881 sinfo.offset = s->len;
883 sinfo.name = s->name;
884 of_elf32.current_dfmt->debug_output(TY_STABSSYMLIN, &sinfo);
886 /* end of debugging stuff */
888 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
889 error(ERR_WARNING, "attempt to initialize memory in"
890 " BSS section `%s': ignored", s->name);
891 if (type == OUT_REL2ADR)
893 else if (type == OUT_REL4ADR)
899 if (type == OUT_RESERVE) {
900 if (s->type == SHT_PROGBITS) {
901 error(ERR_WARNING, "uninitialized space declared in"
902 " non-BSS section `%s': zeroing", s->name);
903 elf_sect_write(s, NULL, size);
906 } else if (type == OUT_RAWDATA) {
907 if (segment != NO_SEG)
908 error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
909 elf_sect_write(s, data, size);
910 } else if (type == OUT_ADDRESS) {
912 addr = *(int64_t *)data;
913 if (segment != NO_SEG) {
915 error(ERR_NONFATAL, "ELF format does not support"
916 " segment base references");
921 elf_add_reloc(s, segment, R_386_16);
923 elf_add_reloc(s, segment, R_386_32);
925 } else if (wrt == elf_gotpc_sect + 1) {
927 * The user will supply GOT relative to $$. ELF
928 * will let us have GOT relative to $. So we
929 * need to fix up the data item by $-$$.
932 elf_add_reloc(s, segment, R_386_GOTPC);
933 } else if (wrt == elf_gotoff_sect + 1) {
934 elf_add_reloc(s, segment, R_386_GOTOFF);
935 } else if (wrt == elf_got_sect + 1) {
936 addr = elf_add_gsym_reloc(s, segment, addr,
938 } else if (wrt == elf_sym_sect + 1) {
941 addr = elf_add_gsym_reloc(s, segment, addr,
944 addr = elf_add_gsym_reloc(s, segment, addr,
947 } else if (wrt == elf_plt_sect + 1) {
948 error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
949 "relative PLT references");
951 error(ERR_NONFATAL, "ELF format does not support this"
953 wrt = NO_SEG; /* we can at least _try_ to continue */
959 error(ERR_WARNING | ERR_WARN_GNUELF,
960 "16-bit relocations in ELF is a GNU extension");
963 if (size != 4 && segment != NO_SEG) {
965 "Unsupported non-32-bit ELF relocation");
969 elf_sect_write(s, mydata, size);
970 } else if (type == OUT_REL2ADR) {
971 if (segment == segto)
972 error(ERR_PANIC, "intra-segment OUT_REL2ADR");
973 if (segment != NO_SEG && segment % 2) {
974 error(ERR_NONFATAL, "ELF format does not support"
975 " segment base references");
978 error(ERR_WARNING | ERR_WARN_GNUELF,
979 "16-bit relocations in ELF is a GNU extension");
980 elf_add_reloc(s, segment, R_386_PC16);
983 "Unsupported non-32-bit ELF relocation");
987 WRITESHORT(p, *(int64_t *)data - size);
988 elf_sect_write(s, mydata, 2L);
989 } else if (type == OUT_REL4ADR) {
990 if (segment == segto)
991 error(ERR_PANIC, "intra-segment OUT_REL4ADR");
992 if (segment != NO_SEG && segment % 2) {
993 error(ERR_NONFATAL, "ELF format does not support"
994 " segment base references");
997 elf_add_reloc(s, segment, R_386_PC32);
998 } else if (wrt == elf_plt_sect + 1) {
999 elf_add_reloc(s, segment, R_386_PLT32);
1000 } else if (wrt == elf_gotpc_sect + 1 ||
1001 wrt == elf_gotoff_sect + 1 ||
1002 wrt == elf_got_sect + 1) {
1003 error(ERR_NONFATAL, "ELF format cannot produce PC-"
1004 "relative GOT references");
1006 error(ERR_NONFATAL, "ELF format does not support this"
1008 wrt = NO_SEG; /* we can at least _try_ to continue */
1012 WRITELONG(p, *(int64_t *)data - size);
1013 elf_sect_write(s, mydata, 4L);
1017 static void elf_write(void)
1027 int32_t symtablen, symtablocal;
1030 * Work out how many sections we will have. We have SHN_UNDEF,
1031 * then the flexible user sections, then the four fixed
1032 * sections `.comment', `.shstrtab', `.symtab' and `.strtab',
1033 * then optionally relocation sections for the user sections.
1035 if (of_elf32.current_dfmt == &df_stabs)
1037 else if (of_elf32.current_dfmt == &df_dwarf)
1040 nsections = 5; /* SHN_UNDEF and the fixed ones */
1042 add_sectname("", ".comment");
1043 add_sectname("", ".shstrtab");
1044 add_sectname("", ".symtab");
1045 add_sectname("", ".strtab");
1046 for (i = 0; i < nsects; i++) {
1047 nsections++; /* for the section itself */
1048 if (sects[i]->head) {
1049 nsections++; /* for its relocations */
1050 add_sectname(".rel", sects[i]->name);
1054 if (of_elf32.current_dfmt == &df_stabs) {
1055 /* in case the debug information is wanted, just add these three sections... */
1056 add_sectname("", ".stab");
1057 add_sectname("", ".stabstr");
1058 add_sectname(".rel", ".stab");
1061 else if (of_elf32.current_dfmt == &df_dwarf) {
1062 /* the dwarf debug standard specifies the following ten sections,
1063 not all of which are currently implemented,
1064 although all of them are defined. */
1065 #define debug_aranges (int32_t) (nsections-10)
1066 #define debug_info (int32_t) (nsections-7)
1067 #define debug_abbrev (int32_t) (nsections-5)
1068 #define debug_line (int32_t) (nsections-4)
1069 add_sectname("", ".debug_aranges");
1070 add_sectname(".rela", ".debug_aranges");
1071 add_sectname("", ".debug_pubnames");
1072 add_sectname("", ".debug_info");
1073 add_sectname(".rela", ".debug_info");
1074 add_sectname("", ".debug_abbrev");
1075 add_sectname("", ".debug_line");
1076 add_sectname(".rela", ".debug_line");
1077 add_sectname("", ".debug_frame");
1078 add_sectname("", ".debug_loc");
1086 2 + sprintf(comment + 1, "The Netwide Assembler %s", NASM_VER);
1089 * Output the ELF header.
1091 fwrite("\177ELF\1\1\1", 7, 1, elffp);
1092 fputc(elf_osabi, elffp);
1093 fputc(elf_abiver, elffp);
1094 fwrite("\0\0\0\0\0\0\0", 7, 1, elffp);
1095 fwriteint16_t(1, elffp); /* ET_REL relocatable file */
1096 fwriteint16_t(3, elffp); /* EM_386 processor ID */
1097 fwriteint32_t(1L, elffp); /* EV_CURRENT file format version */
1098 fwriteint32_t(0L, elffp); /* no entry point */
1099 fwriteint32_t(0L, elffp); /* no program header table */
1100 fwriteint32_t(0x40L, elffp); /* section headers straight after
1101 * ELF header plus alignment */
1102 fwriteint32_t(0L, elffp); /* 386 defines no special flags */
1103 fwriteint16_t(0x34, elffp); /* size of ELF header */
1104 fwriteint16_t(0, elffp); /* no program header table, again */
1105 fwriteint16_t(0, elffp); /* still no program header table */
1106 fwriteint16_t(0x28, elffp); /* size of section header */
1107 fwriteint16_t(nsections, elffp); /* number of sections */
1108 fwriteint16_t(nsects + 2, elffp); /* string table section index for
1109 * section header table */
1110 fwriteint32_t(0L, elffp); /* align to 0x40 bytes */
1111 fwriteint32_t(0L, elffp);
1112 fwriteint32_t(0L, elffp);
1115 * Build the symbol table and relocation tables.
1117 symtab = elf_build_symtab(&symtablen, &symtablocal);
1118 for (i = 0; i < nsects; i++)
1120 sects[i]->rel = elf_build_reltab(§s[i]->rellen,
1124 * Now output the section header table.
1127 elf_foffs = 0x40 + 0x28 * nsections;
1128 align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
1131 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1133 elf_section_header(0, 0, 0, NULL, false, 0L, 0, 0, 0, 0); /* SHN_UNDEF */
1134 scount = 1; /* needed for the stabs debugging to track the symtable section */
1136 for (i = 0; i < nsects; i++) {
1137 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1138 (sects[i]->type == SHT_PROGBITS ?
1139 sects[i]->data : NULL), true,
1140 sects[i]->len, 0, 0, sects[i]->align, 0);
1142 scount++; /* dito */
1144 elf_section_header(p - shstrtab, 1, 0, comment, false, (int32_t)commlen, 0, 0, 1, 0); /* .comment */
1145 scount++; /* dito */
1147 elf_section_header(p - shstrtab, 3, 0, shstrtab, false, (int32_t)shstrtablen, 0, 0, 1, 0); /* .shstrtab */
1148 scount++; /* dito */
1150 elf_section_header(p - shstrtab, 2, 0, symtab, true, symtablen, nsects + 4, symtablocal, 4, 16); /* .symtab */
1151 symtabsection = scount; /* now we got the symtab section index in the ELF file */
1153 elf_section_header(p - shstrtab, 3, 0, strs, true, strslen, 0, 0, 1, 0); /* .strtab */
1154 for (i = 0; i < nsects; i++)
1155 if (sects[i]->head) {
1157 elf_section_header(p - shstrtab, 9, 0, sects[i]->rel, true,
1158 sects[i]->rellen, nsects + 3, i + 1, 4, 8);
1160 if (of_elf32.current_dfmt == &df_stabs) {
1161 /* for debugging information, create the last three sections
1162 which are the .stab , .stabstr and .rel.stab sections respectively */
1164 /* this function call creates the stab sections in memory */
1167 if ((stabbuf) && (stabstrbuf) && (stabrelbuf)) {
1169 elf_section_header(p - shstrtab, 1, 0, stabbuf, false, stablen,
1170 nsections - 2, 0, 4, 12);
1173 elf_section_header(p - shstrtab, 3, 0, stabstrbuf, false,
1174 stabstrlen, 0, 0, 4, 0);
1177 /* link -> symtable info -> section to refer to */
1178 elf_section_header(p - shstrtab, 9, 0, stabrelbuf, false,
1179 stabrellen, symtabsection, nsections - 3, 4,
1183 else if (of_elf32.current_dfmt == &df_dwarf) {
1184 /* for dwarf debugging information, create the ten dwarf sections */
1186 /* this function call creates the dwarf sections in memory */
1187 if (dwarf_fsect) dwarf32_generate();
1190 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1191 arangeslen, 0, 0, 1, 0);
1193 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1194 arangesrellen, symtabsection, debug_aranges, 1, 12);
1196 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf, false,
1197 pubnameslen, 0, 0, 1, 0);
1199 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1200 infolen, 0, 0, 1, 0);
1202 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1203 inforellen, symtabsection, debug_info, 1, 12);
1205 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1206 abbrevlen, 0, 0, 1, 0);
1208 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1209 linelen, 0, 0, 1, 0);
1211 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1212 linerellen, symtabsection, debug_line, 1, 12);
1214 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1215 framelen, 0, 0, 8, 0);
1217 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1218 loclen, 0, 0, 1, 0);
1221 fwrite(align_str, align, 1, elffp);
1224 * Now output the sections.
1226 elf_write_sections();
1228 nasm_free(elf_sects);
1232 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1234 struct SAA *s = saa_init(1L);
1236 uint8_t entry[16], *p;
1242 * First, an all-zeros entry, required by the ELF spec.
1244 saa_wbytes(s, NULL, 16L); /* null symbol table entry */
1249 * Next, an entry for the file name.
1252 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1253 WRITELONG(p, 0); /* no value */
1254 WRITELONG(p, 0); /* no size either */
1255 WRITESHORT(p, STT_FILE); /* type FILE */
1256 WRITESHORT(p, SHN_ABS);
1257 saa_wbytes(s, entry, 16L);
1262 * Now some standard symbols defining the segments, for relocation
1265 for (i = 1; i <= nsects; i++) {
1267 WRITELONG(p, 0); /* no symbol name */
1268 WRITELONG(p, 0); /* offset zero */
1269 WRITELONG(p, 0); /* size zero */
1270 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1271 WRITESHORT(p, i); /* section id */
1272 saa_wbytes(s, entry, 16L);
1278 * Now the other local symbols.
1281 while ((sym = saa_rstruct(syms))) {
1282 if (sym->type & SYM_GLOBAL)
1285 WRITELONG(p, sym->strpos);
1286 WRITELONG(p, sym->value);
1287 WRITELONG(p, sym->size);
1288 WRITECHAR(p, sym->type); /* type and binding */
1289 WRITECHAR(p, sym->other); /* visibility */
1290 WRITESHORT(p, sym->section);
1291 saa_wbytes(s, entry, 16L);
1296 * dwarf needs symbols for debug sections
1297 * which are relocation targets.
1299 //*** fix for 32 bit
1300 if (of_elf32.current_dfmt == &df_dwarf) {
1301 dwarf_infosym = *local;
1303 WRITELONG(p, 0); /* no symbol name */
1304 WRITELONG(p, (uint32_t) 0); /* offset zero */
1305 WRITELONG(p, (uint32_t) 0); /* size zero */
1306 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1307 WRITESHORT(p, debug_info); /* section id */
1308 saa_wbytes(s, entry, 16L);
1311 dwarf_abbrevsym = *local;
1313 WRITELONG(p, 0); /* no symbol name */
1314 WRITELONG(p, (uint32_t) 0); /* offset zero */
1315 WRITELONG(p, (uint32_t) 0); /* size zero */
1316 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1317 WRITESHORT(p, debug_abbrev); /* section id */
1318 saa_wbytes(s, entry, 16L);
1321 dwarf_linesym = *local;
1323 WRITELONG(p, 0); /* no symbol name */
1324 WRITELONG(p, (uint32_t) 0); /* offset zero */
1325 WRITELONG(p, (uint32_t) 0); /* size zero */
1326 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1327 WRITESHORT(p, debug_line); /* section id */
1328 saa_wbytes(s, entry, 16L);
1334 * Now the global symbols.
1337 while ((sym = saa_rstruct(syms))) {
1338 if (!(sym->type & SYM_GLOBAL))
1341 WRITELONG(p, sym->strpos);
1342 WRITELONG(p, sym->value);
1343 WRITELONG(p, sym->size);
1344 WRITECHAR(p, sym->type); /* type and binding */
1345 WRITECHAR(p, sym->other); /* visibility */
1346 WRITESHORT(p, sym->section);
1347 saa_wbytes(s, entry, 16L);
1354 static struct SAA *elf_build_reltab(int32_t *len, struct Reloc *r)
1357 uint8_t *p, entry[8];
1366 int32_t sym = r->symbol;
1368 if (sym >= GLOBAL_TEMP_BASE)
1370 if (of_elf32.current_dfmt == &df_dwarf)
1371 sym += -GLOBAL_TEMP_BASE + (nsects + 5) + nlocals;
1372 else sym += -GLOBAL_TEMP_BASE + (nsects + 2) + nlocals;
1376 WRITELONG(p, r->address);
1377 WRITELONG(p, (sym << 8) + r->type);
1378 saa_wbytes(s, entry, 8L);
1387 static void elf_section_header(int name, int type, int flags,
1388 void *data, bool is_saa, int32_t datalen,
1389 int link, int info, int align, int eltsize)
1391 elf_sects[elf_nsect].data = data;
1392 elf_sects[elf_nsect].len = datalen;
1393 elf_sects[elf_nsect].is_saa = is_saa;
1396 fwriteint32_t((int32_t)name, elffp);
1397 fwriteint32_t((int32_t)type, elffp);
1398 fwriteint32_t((int32_t)flags, elffp);
1399 fwriteint32_t(0L, elffp); /* no address, ever, in object files */
1400 fwriteint32_t(type == 0 ? 0L : elf_foffs, elffp);
1401 fwriteint32_t(datalen, elffp);
1403 elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1404 fwriteint32_t((int32_t)link, elffp);
1405 fwriteint32_t((int32_t)info, elffp);
1406 fwriteint32_t((int32_t)align, elffp);
1407 fwriteint32_t((int32_t)eltsize, elffp);
1410 static void elf_write_sections(void)
1413 for (i = 0; i < elf_nsect; i++)
1414 if (elf_sects[i].data) {
1415 int32_t len = elf_sects[i].len;
1416 int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1417 int32_t align = reallen - len;
1418 if (elf_sects[i].is_saa)
1419 saa_fpwrite(elf_sects[i].data, elffp);
1421 fwrite(elf_sects[i].data, len, 1, elffp);
1422 fwrite(align_str, align, 1, elffp);
1426 static void elf_sect_write(struct Section *sect,
1427 const uint8_t *data, uint32_t len)
1429 saa_wbytes(sect->data, data, len);
1433 static int32_t elf_segbase(int32_t segment)
1438 static int elf_directive(char *directive, char *value, int pass)
1444 if (!strcmp(directive, "osabi")) {
1446 return 1; /* ignore in pass 2 */
1448 n = readnum(value, &err);
1450 error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1453 if (n < 0 || n > 255) {
1454 error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1460 if ((p = strchr(value,',')) == NULL)
1463 n = readnum(p+1, &err);
1464 if (err || n < 0 || n > 255) {
1465 error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1476 static void elf_filename(char *inname, char *outname, efunc error)
1478 strcpy(elf_module, inname);
1479 standard_extension(inname, outname, ".o", error);
1482 static const char *elf_stdmac[] = {
1483 "%define __SECT__ [section .text]",
1484 "%macro __NASM_CDecl__ 1",
1487 "%macro osabi 1+.nolist",
1492 static int elf_set_info(enum geninfo type, char **val)
1498 static struct dfmt df_dwarf = {
1499 "elf32 (X86_64) dwarf debug format for Linux",
1509 static struct dfmt df_stabs = {
1510 "ELF32 (i386) stabs debug format for Linux",
1521 struct dfmt *elf32_debugs_arr[3] = { &df_stabs, &df_dwarf, NULL };
1523 struct ofmt of_elf32 = {
1524 "ELF32 (i386) object files (e.g. Linux)",
1541 struct ofmt of_elf = {
1542 "ELF (short name for ELF32) ",
1558 /* again, the stabs debugging stuff (code) */
1560 void debug32_init(struct ofmt *of, void *id, FILE * fp, efunc error)
1568 void stabs32_linenum(const char *filename, int32_t linenumber, int32_t segto)
1572 if (!stabs_filename) {
1573 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1574 strcpy(stabs_filename, filename);
1576 if (strcmp(stabs_filename, filename)) {
1577 /* yep, a memory leak...this program is one-shot anyway, so who cares...
1578 in fact, this leak comes in quite handy to maintain a list of files
1579 encountered so far in the symbol lines... */
1581 /* why not nasm_free(stabs_filename); we're done with the old one */
1583 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1584 strcpy(stabs_filename, filename);
1588 currentline = linenumber;
1591 void debug32_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1601 void debug32_directive(const char *directive, const char *params)
1607 void debug32_typevalue(int32_t type)
1609 int32_t stype, ssize;
1610 switch (TYM_TYPE(type)) {
1649 stype = STT_SECTION;
1664 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1665 lastsym->size = ssize;
1666 lastsym->type = stype;
1670 void stabs32_output(int type, void *param)
1672 struct symlininfo *s;
1673 struct linelist *el;
1674 if (type == TY_STABSSYMLIN) {
1675 if (debug_immcall) {
1676 s = (struct symlininfo *)param;
1677 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1678 return; /* we are only interested in the text stuff */
1680 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1681 el->info.offset = s->offset;
1682 el->info.section = s->section;
1683 el->info.name = s->name;
1684 el->line = currentline;
1685 el->filename = stabs_filename;
1688 stabslines->last->next = el;
1689 stabslines->last = el;
1692 stabslines->last = el;
1699 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
1701 WRITELONG(p,n_strx); \
1702 WRITECHAR(p,n_type); \
1703 WRITECHAR(p,n_other); \
1704 WRITESHORT(p,n_desc); \
1705 WRITELONG(p,n_value); \
1708 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1710 void stabs32_generate(void)
1712 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1713 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1717 struct linelist *ptr;
1721 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(char *));
1722 for (i = 0; i < numlinestabs; i++)
1726 if (numfiles == 0) {
1727 allfiles[0] = ptr->filename;
1730 for (i = 0; i < numfiles; i++) {
1731 if (!strcmp(allfiles[i], ptr->filename))
1734 if (i >= numfiles) {
1735 allfiles[i] = ptr->filename;
1742 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1743 for (i = 0; i < numfiles; i++) {
1744 fileidx[i] = strsize;
1745 strsize += strlen(allfiles[i]) + 1;
1748 for (i = 0; i < numfiles; i++) {
1749 if (!strcmp(allfiles[i], elf_module)) {
1755 /* worst case size of the stab buffer would be:
1756 the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1759 (uint8_t *)nasm_malloc((numlinestabs * 2 + 3) *
1760 sizeof(struct stabentry));
1762 ssbuf = (uint8_t *)nasm_malloc(strsize);
1764 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3));
1767 for (i = 0; i < numfiles; i++) {
1768 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1772 stabstrlen = strsize; /* set global variable for length of stab strings */
1779 /* this is the first stab, its strx points to the filename of the
1780 the source-file, the n_desc field should be set to the number
1783 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1785 /* this is the stab for the main source file */
1786 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1788 /* relocation table entry */
1790 /* Since the symbol table has two entries before */
1791 /* the section symbols, the index in the info.section */
1792 /* member must be adjusted by adding 2 */
1794 WRITELONG(rptr, (sptr - sbuf) - 4);
1795 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1798 currfile = mainfileindex;
1802 if (strcmp(allfiles[currfile], ptr->filename)) {
1803 /* oops file has changed... */
1804 for (i = 0; i < numfiles; i++)
1805 if (!strcmp(allfiles[i], ptr->filename))
1808 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1812 /* relocation table entry */
1813 WRITELONG(rptr, (sptr - sbuf) - 4);
1814 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1817 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1820 /* relocation table entry */
1822 WRITELONG(rptr, (sptr - sbuf) - 4);
1823 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1829 ((struct stabentry *)sbuf)->n_desc = numstabs;
1831 nasm_free(allfiles);
1834 stablen = (sptr - sbuf);
1835 stabrellen = (rptr - rbuf);
1841 void stabs32_cleanup(void)
1843 struct linelist *ptr, *del;
1855 nasm_free(stabrelbuf);
1857 nasm_free(stabstrbuf);
1859 /* dwarf routines */
1862 void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t segto)
1865 dwarf32_findfile(filename);
1867 currentline = linenumber;
1870 /* called from elf_out with type == TY_DEBUGSYMLIN */
1871 void dwarf32_output(int type, void *param)
1873 int ln, aa, inx, maxln, soc;
1874 struct symlininfo *s;
1879 s = (struct symlininfo *)param;
1880 /* line number info is only gathered for executable sections */
1881 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1883 /* Check if section index has changed */
1884 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1886 dwarf32_findsect(s->section);
1888 /* do nothing unless line or file has changed */
1891 ln = currentline - dwarf_csect->line;
1892 aa = s->offset - dwarf_csect->offset;
1893 inx = dwarf_clist->line;
1894 plinep = dwarf_csect->psaa;
1895 /* check for file change */
1896 if (!(inx == dwarf_csect->file))
1898 WSAACHAR(plinep,DW_LNS_set_file);
1899 WSAACHAR(plinep,inx);
1900 dwarf_csect->file = inx;
1902 /* check for line change */
1905 /* test if in range of special op code */
1906 maxln = line_base + line_range;
1907 soc = (ln - line_base) + (line_range * aa) + opcode_base;
1908 if (ln >= line_base && ln < maxln && soc < 256)
1910 WSAACHAR(plinep,soc);
1916 WSAACHAR(plinep,DW_LNS_advance_line);
1917 saa_wleb128s(plinep,ln);
1921 WSAACHAR(plinep,DW_LNS_advance_pc);
1922 saa_wleb128u(plinep,aa);
1925 dwarf_csect->line = currentline;
1926 dwarf_csect->offset = s->offset;
1928 /* show change handled */
1934 void dwarf32_generate(void)
1936 static const char nasm_signature[] = "NASM " NASM_VER;
1939 struct linelist *ftentry;
1940 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
1941 struct SAA *parangesrel, *plinesrel, *pinforel;
1942 struct sectlist *psect;
1943 size_t saalen, linepoff, totlen, highaddr;
1945 /* write epilogues for each line program range */
1946 /* and build aranges section */
1947 paranges = saa_init(1L);
1948 parangesrel = saa_init(1L);
1949 WSAASHORT(paranges,2); /* dwarf version */
1950 WSAALONG(parangesrel, paranges->datalen+4);
1951 WSAALONG(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
1952 WSAALONG(parangesrel, 0);
1953 WSAALONG(paranges,0); /* offset into info */
1954 WSAACHAR(paranges,4); /* pointer size */
1955 WSAACHAR(paranges,0); /* not segmented */
1956 WSAALONG(paranges,0); /* padding */
1957 /* iterate though sectlist entries */
1958 psect = dwarf_fsect;
1961 for (indx = 0; indx < dwarf_nsections; indx++)
1963 plinep = psect->psaa;
1964 /* Line Number Program Epilogue */
1965 WSAACHAR(plinep,2); /* std op 2 */
1966 WSAACHAR(plinep,(sects[psect->section]->len)-psect->offset);
1967 WSAACHAR(plinep,DW_LNS_extended_op);
1968 WSAACHAR(plinep,1); /* operand length */
1969 WSAACHAR(plinep,DW_LNE_end_sequence);
1970 totlen += plinep->datalen;
1971 /* range table relocation entry */
1972 WSAALONG(parangesrel, paranges->datalen + 4);
1973 WSAALONG(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
1974 WSAALONG(parangesrel, (uint32_t) 0);
1975 /* range table entry */
1976 WSAALONG(paranges,0x0000); /* range start */
1977 WSAALONG(paranges,sects[psect->section]->len); /* range length */
1978 highaddr += sects[psect->section]->len;
1979 /* done with this entry */
1980 psect = psect->next;
1982 WSAALONG(paranges,0); /* null address */
1983 WSAALONG(paranges,0); /* null length */
1984 saalen = paranges->datalen;
1985 arangeslen = saalen + 4;
1986 arangesbuf = pbuf = nasm_malloc(arangeslen);
1987 WRITELONG(pbuf,saalen); /* initial length */
1988 saa_rnbytes(paranges, pbuf, saalen);
1991 /* build rela.aranges section */
1992 arangesrellen = saalen = parangesrel->datalen;
1993 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
1994 saa_rnbytes(parangesrel, pbuf, saalen);
1995 saa_free(parangesrel);
1997 /* build pubnames section */
1998 ppubnames = saa_init(1L);
1999 WSAASHORT(ppubnames,3); /* dwarf version */
2000 WSAALONG(ppubnames,0); /* offset into info */
2001 WSAALONG(ppubnames,0); /* space used in info */
2002 WSAALONG(ppubnames,0); /* end of list */
2003 saalen = ppubnames->datalen;
2004 pubnameslen = saalen + 4;
2005 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
2006 WRITELONG(pbuf,saalen); /* initial length */
2007 saa_rnbytes(ppubnames, pbuf, saalen);
2008 saa_free(ppubnames);
2010 /* build info section */
2011 pinfo = saa_init(1L);
2012 pinforel = saa_init(1L);
2013 WSAASHORT(pinfo,2); /* dwarf version */
2014 WSAALONG(pinforel, pinfo->datalen + 4);
2015 WSAALONG(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
2016 WSAALONG(pinforel, 0);
2017 WSAALONG(pinfo,0); /* offset into abbrev */
2018 WSAACHAR(pinfo,4); /* pointer size */
2019 WSAACHAR(pinfo,1); /* abbrviation number LEB128u */
2020 WSAALONG(pinforel, pinfo->datalen + 4);
2021 WSAALONG(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
2022 WSAALONG(pinforel, 0);
2023 WSAALONG(pinfo,0); /* DW_AT_low_pc */
2024 WSAALONG(pinforel, pinfo->datalen + 4);
2025 WSAALONG(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
2026 WSAALONG(pinforel, 0);
2027 WSAALONG(pinfo,highaddr); /* DW_AT_high_pc */
2028 WSAALONG(pinforel, pinfo->datalen + 4);
2029 WSAALONG(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
2030 WSAALONG(pinforel, 0);
2031 WSAALONG(pinfo,0); /* DW_AT_stmt_list */
2032 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
2033 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
2034 WSAASHORT(pinfo,DW_LANG_Mips_Assembler);
2035 WSAACHAR(pinfo,2); /* abbrviation number LEB128u */
2036 WSAALONG(pinforel, pinfo->datalen + 4);
2037 WSAALONG(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
2038 WSAALONG(pinforel, 0);
2039 WSAALONG(pinfo,0); /* DW_AT_low_pc */
2040 WSAALONG(pinfo,0); /* DW_AT_frame_base */
2041 WSAACHAR(pinfo,0); /* end of entries */
2042 saalen = pinfo->datalen;
2043 infolen = saalen + 4;
2044 infobuf = pbuf = nasm_malloc(infolen);
2045 WRITELONG(pbuf,saalen); /* initial length */
2046 saa_rnbytes(pinfo, pbuf, saalen);
2049 /* build rela.info section */
2050 inforellen = saalen = pinforel->datalen;
2051 inforelbuf = pbuf = nasm_malloc(inforellen);
2052 saa_rnbytes(pinforel, pbuf, saalen);
2055 /* build abbrev section */
2056 pabbrev = saa_init(1L);
2057 WSAACHAR(pabbrev,1); /* entry number LEB128u */
2058 WSAACHAR(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
2059 WSAACHAR(pabbrev,1); /* has children */
2060 /* the following attributes and forms are all LEB128u values */
2061 WSAACHAR(pabbrev,DW_AT_low_pc);
2062 WSAACHAR(pabbrev,DW_FORM_addr);
2063 WSAACHAR(pabbrev,DW_AT_high_pc);
2064 WSAACHAR(pabbrev,DW_FORM_addr);
2065 WSAACHAR(pabbrev,DW_AT_stmt_list);
2066 WSAACHAR(pabbrev,DW_FORM_data4);
2067 WSAACHAR(pabbrev,DW_AT_name);
2068 WSAACHAR(pabbrev,DW_FORM_string);
2069 WSAACHAR(pabbrev,DW_AT_producer);
2070 WSAACHAR(pabbrev,DW_FORM_string);
2071 WSAACHAR(pabbrev,DW_AT_language);
2072 WSAACHAR(pabbrev,DW_FORM_data2);
2073 WSAASHORT(pabbrev,0); /* end of entry */
2074 /* LEB128u usage same as above */
2075 WSAACHAR(pabbrev,2); /* entry number */
2076 WSAACHAR(pabbrev,DW_TAG_subprogram);
2077 WSAACHAR(pabbrev,0); /* no children */
2078 WSAACHAR(pabbrev,DW_AT_low_pc);
2079 WSAACHAR(pabbrev,DW_FORM_addr);
2080 WSAACHAR(pabbrev,DW_AT_frame_base);
2081 WSAACHAR(pabbrev,DW_FORM_data4);
2082 WSAASHORT(pabbrev,0); /* end of entry */
2083 abbrevlen = saalen = pabbrev->datalen;
2084 abbrevbuf = pbuf = nasm_malloc(saalen);
2085 saa_rnbytes(pabbrev, pbuf, saalen);
2088 /* build line section */
2090 plines = saa_init(1L);
2091 WSAACHAR(plines,1); /* Minimum Instruction Length */
2092 WSAACHAR(plines,1); /* Initial value of 'is_stmt' */
2093 WSAACHAR(plines,line_base); /* Line Base */
2094 WSAACHAR(plines,line_range); /* Line Range */
2095 WSAACHAR(plines,opcode_base); /* Opcode Base */
2096 /* standard opcode lengths (# of LEB128u operands) */
2097 WSAACHAR(plines,0); /* Std opcode 1 length */
2098 WSAACHAR(plines,1); /* Std opcode 2 length */
2099 WSAACHAR(plines,1); /* Std opcode 3 length */
2100 WSAACHAR(plines,1); /* Std opcode 4 length */
2101 WSAACHAR(plines,1); /* Std opcode 5 length */
2102 WSAACHAR(plines,0); /* Std opcode 6 length */
2103 WSAACHAR(plines,0); /* Std opcode 7 length */
2104 WSAACHAR(plines,0); /* Std opcode 8 length */
2105 WSAACHAR(plines,1); /* Std opcode 9 length */
2106 WSAACHAR(plines,0); /* Std opcode 10 length */
2107 WSAACHAR(plines,0); /* Std opcode 11 length */
2108 WSAACHAR(plines,1); /* Std opcode 12 length */
2109 /* Directory Table */
2110 WSAACHAR(plines,0); /* End of table */
2111 /* File Name Table */
2112 ftentry = dwarf_flist;
2113 for (indx = 0;indx<dwarf_numfiles;indx++)
2115 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2116 WSAACHAR(plines,0); /* directory LEB128u */
2117 WSAACHAR(plines,0); /* time LEB128u */
2118 WSAACHAR(plines,0); /* size LEB128u */
2119 ftentry = ftentry->next;
2121 WSAACHAR(plines,0); /* End of table */
2122 linepoff = plines->datalen;
2123 linelen = linepoff + totlen + 10;
2124 linebuf = pbuf = nasm_malloc(linelen);
2125 WRITELONG(pbuf,linelen-4); /* initial length */
2126 WRITESHORT(pbuf,3); /* dwarf version */
2127 WRITELONG(pbuf,linepoff); /* offset to line number program */
2128 /* write line header */
2130 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2133 /* concatonate line program ranges */
2135 plinesrel = saa_init(1L);
2136 psect = dwarf_fsect;
2137 for (indx = 0; indx < dwarf_nsections; indx++)
2139 WSAALONG(plinesrel, linepoff);
2140 WSAALONG(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
2141 WSAALONG(plinesrel, (uint32_t) 0);
2142 plinep = psect->psaa;
2143 saalen = plinep->datalen;
2144 saa_rnbytes(plinep, pbuf, saalen);
2148 /* done with this entry */
2149 psect = psect->next;
2153 /* build rela.lines section */
2154 linerellen =saalen = plinesrel->datalen;
2155 linerelbuf = pbuf = nasm_malloc(linerellen);
2156 saa_rnbytes(plinesrel, pbuf, saalen);
2157 saa_free(plinesrel);
2159 /* build frame section */
2161 framebuf = pbuf = nasm_malloc(framelen);
2162 WRITELONG(pbuf,framelen-4); /* initial length */
2164 /* build loc section */
2166 locbuf = pbuf = nasm_malloc(loclen);
2167 WRITELONG(pbuf,0); /* null beginning offset */
2168 WRITELONG(pbuf,0); /* null ending offset */
2171 void dwarf32_cleanup(void)
2174 nasm_free(arangesbuf);
2176 nasm_free(arangesrelbuf);
2178 nasm_free(pubnamesbuf);
2182 nasm_free(inforelbuf);
2184 nasm_free(abbrevbuf);
2188 nasm_free(linerelbuf);
2190 nasm_free(framebuf);
2194 void dwarf32_findfile(const char * fname)
2197 struct linelist *match;
2199 /* return if fname is current file name */
2200 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename))) return;
2201 /* search for match */
2207 match = dwarf_flist;
2208 for (finx = 0; finx < dwarf_numfiles; finx++)
2210 if (!(strcmp(fname, match->filename)))
2212 dwarf_clist = match;
2217 /* add file name to end of list */
2218 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2220 dwarf_clist->line = dwarf_numfiles;
2221 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2222 strcpy(dwarf_clist->filename,fname);
2223 dwarf_clist->next = 0;
2224 /* if first entry */
2227 dwarf_flist = dwarf_elist = dwarf_clist;
2228 dwarf_clist->last = 0;
2230 /* chain to previous entry */
2233 dwarf_elist->next = dwarf_clist;
2234 dwarf_elist = dwarf_clist;
2239 void dwarf32_findsect(const int index)
2242 struct sectlist *match;
2244 /* return if index is current section index */
2245 if (dwarf_csect && (dwarf_csect->section == index))
2249 /* search for match */
2255 match = dwarf_fsect;
2256 for (sinx = 0; sinx < dwarf_nsections; sinx++)
2258 if ((match->section == index))
2260 dwarf_csect = match;
2263 match = match->next;
2266 /* add entry to end of list */
2267 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2269 dwarf_csect->psaa = plinep = saa_init(1L);
2270 dwarf_csect->line = 1;
2271 dwarf_csect->offset = 0;
2272 dwarf_csect->file = 1;
2273 dwarf_csect->section = index;
2274 dwarf_csect->next = 0;
2275 /* set relocatable address at start of line program */
2276 WSAACHAR(plinep,DW_LNS_extended_op);
2277 WSAACHAR(plinep,5); /* operand length */
2278 WSAACHAR(plinep,DW_LNE_set_address);
2279 WSAALONG(plinep,0); /* Start Address */
2280 /* if first entry */
2283 dwarf_fsect = dwarf_esect = dwarf_csect;
2284 dwarf_csect->last = 0;
2286 /* chain to previous entry */
2289 dwarf_esect->next = dwarf_csect;
2290 dwarf_esect = dwarf_csect;