1 /* ELF object file format
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 3,
11 or (at your option) any later version.
13 GAS is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 the GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 #define OBJ_HEADER "obj-elf.h"
25 #include "safe-ctype.h"
28 #include "struc-symbol.h"
29 #include "dwarf2dbg.h"
31 #ifndef ECOFF_DEBUGGING
32 #define ECOFF_DEBUGGING 0
34 #define NEED_ECOFF_DEBUG
37 #ifdef NEED_ECOFF_DEBUG
42 #include "elf/alpha.h"
58 #include "elf/x86-64.h"
65 static void obj_elf_line (int);
66 static void obj_elf_size (int);
67 static void obj_elf_type (int);
68 static void obj_elf_ident (int);
69 static void obj_elf_weak (int);
70 static void obj_elf_local (int);
71 static void obj_elf_visibility (int);
72 static void obj_elf_symver (int);
73 static void obj_elf_subsection (int);
74 static void obj_elf_popsection (int);
75 static void obj_elf_tls_common (int);
76 static void obj_elf_lcomm (int);
77 static void obj_elf_struct (int);
79 static const pseudo_typeS elf_pseudo_table[] =
81 {"comm", obj_elf_common, 0},
82 {"common", obj_elf_common, 1},
83 {"ident", obj_elf_ident, 0},
84 {"lcomm", obj_elf_lcomm, 0},
85 {"local", obj_elf_local, 0},
86 {"previous", obj_elf_previous, 0},
87 {"section", obj_elf_section, 0},
88 {"section.s", obj_elf_section, 0},
89 {"sect", obj_elf_section, 0},
90 {"sect.s", obj_elf_section, 0},
91 {"pushsection", obj_elf_section, 1},
92 {"popsection", obj_elf_popsection, 0},
93 {"size", obj_elf_size, 0},
94 {"type", obj_elf_type, 0},
95 {"version", obj_elf_version, 0},
96 {"weak", obj_elf_weak, 0},
98 /* These define symbol visibility. */
99 {"internal", obj_elf_visibility, STV_INTERNAL},
100 {"hidden", obj_elf_visibility, STV_HIDDEN},
101 {"protected", obj_elf_visibility, STV_PROTECTED},
103 /* These are used for stabs-in-elf configurations. */
104 {"line", obj_elf_line, 0},
106 /* This is a GNU extension to handle symbol versions. */
107 {"symver", obj_elf_symver, 0},
109 /* A GNU extension to change subsection only. */
110 {"subsection", obj_elf_subsection, 0},
112 /* These are GNU extensions to aid in garbage collecting C++ vtables. */
113 {"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit, 0},
114 {"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry, 0},
116 /* These are used for dwarf. */
120 /* These are used for dwarf2. */
121 { "file", (void (*) (int)) dwarf2_directive_file, 0 },
122 { "loc", dwarf2_directive_loc, 0 },
123 { "loc_mark_labels", dwarf2_directive_loc_mark_labels, 0 },
125 /* We need to trap the section changing calls to handle .previous. */
126 {"data", obj_elf_data, 0},
127 {"offset", obj_elf_struct, 0},
128 {"struct", obj_elf_struct, 0},
129 {"text", obj_elf_text, 0},
131 {"tls_common", obj_elf_tls_common, 0},
137 static const pseudo_typeS ecoff_debug_pseudo_table[] =
139 #ifdef NEED_ECOFF_DEBUG
140 /* COFF style debugging information for ECOFF. .ln is not used; .loc
142 { "def", ecoff_directive_def, 0 },
143 { "dim", ecoff_directive_dim, 0 },
144 { "endef", ecoff_directive_endef, 0 },
145 { "file", ecoff_directive_file, 0 },
146 { "scl", ecoff_directive_scl, 0 },
147 { "tag", ecoff_directive_tag, 0 },
148 { "val", ecoff_directive_val, 0 },
150 /* COFF debugging requires pseudo-ops .size and .type, but ELF
151 already has meanings for those. We use .esize and .etype
152 instead. These are only generated by gcc anyhow. */
153 { "esize", ecoff_directive_size, 0 },
154 { "etype", ecoff_directive_type, 0 },
156 /* ECOFF specific debugging information. */
157 { "begin", ecoff_directive_begin, 0 },
158 { "bend", ecoff_directive_bend, 0 },
159 { "end", ecoff_directive_end, 0 },
160 { "ent", ecoff_directive_ent, 0 },
161 { "fmask", ecoff_directive_fmask, 0 },
162 { "frame", ecoff_directive_frame, 0 },
163 { "loc", ecoff_directive_loc, 0 },
164 { "mask", ecoff_directive_mask, 0 },
166 /* Other ECOFF directives. */
167 { "extern", ecoff_directive_extern, 0 },
169 /* These are used on Irix. I don't know how to implement them. */
170 { "alias", s_ignore, 0 },
171 { "bgnb", s_ignore, 0 },
172 { "endb", s_ignore, 0 },
173 { "lab", s_ignore, 0 },
174 { "noalias", s_ignore, 0 },
175 { "verstamp", s_ignore, 0 },
176 { "vreg", s_ignore, 0 },
179 {NULL, NULL, 0} /* end sentinel */
183 #include "aout/aout64.h"
185 /* This is called when the assembler starts. */
187 asection *elf_com_section_ptr;
194 /* Add symbols for the known sections to the symbol table. */
195 s = bfd_get_section_by_name (stdoutput, TEXT_SECTION_NAME);
196 symbol_table_insert (section_symbol (s));
197 s = bfd_get_section_by_name (stdoutput, DATA_SECTION_NAME);
198 symbol_table_insert (section_symbol (s));
199 s = bfd_get_section_by_name (stdoutput, BSS_SECTION_NAME);
200 symbol_table_insert (section_symbol (s));
201 elf_com_section_ptr = bfd_com_section_ptr;
205 elf_pop_insert (void)
207 pop_insert (elf_pseudo_table);
209 pop_insert (ecoff_debug_pseudo_table);
213 elf_s_get_size (symbolS *sym)
215 return S_GET_SIZE (sym);
219 elf_s_set_size (symbolS *sym, bfd_vma sz)
221 S_SET_SIZE (sym, sz);
225 elf_s_get_align (symbolS *sym)
227 return S_GET_ALIGN (sym);
231 elf_s_set_align (symbolS *sym, bfd_vma align)
233 S_SET_ALIGN (sym, align);
237 elf_s_get_other (symbolS *sym)
239 return elf_symbol (symbol_get_bfdsym (sym))->internal_elf_sym.st_other;
243 elf_s_set_other (symbolS *sym, int other)
245 S_SET_OTHER (sym, other);
249 elf_sec_sym_ok_for_reloc (asection *sec)
251 return obj_sec_sym_ok_for_reloc (sec);
255 elf_file_symbol (const char *s, int appfile)
258 || symbol_rootP == NULL
259 || symbol_rootP->bsym == NULL
260 || (symbol_rootP->bsym->flags & BSF_FILE) == 0)
264 sym = symbol_new (s, absolute_section, 0, NULL);
265 symbol_set_frag (sym, &zero_address_frag);
266 symbol_get_bfdsym (sym)->flags |= BSF_FILE;
268 if (symbol_rootP != sym)
270 symbol_remove (sym, &symbol_rootP, &symbol_lastP);
271 symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP);
273 verify_symbol_chain (symbol_rootP, symbol_lastP);
278 #ifdef NEED_ECOFF_DEBUG
279 ecoff_new_file (s, appfile);
283 /* Called from read.c:s_comm after we've parsed .comm symbol, size.
284 Parse a possible alignment value. */
287 elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP, addressT size)
290 int is_local = symbol_get_obj (symbolP)->local;
292 if (*input_line_pointer == ',')
294 char *save = input_line_pointer;
296 input_line_pointer++;
299 if (*input_line_pointer == '"')
301 /* For sparc. Accept .common symbol, length, "bss" */
302 input_line_pointer++;
303 /* Some use the dot, some don't. */
304 if (*input_line_pointer == '.')
305 input_line_pointer++;
306 /* Some say data, some say bss. */
307 if (strncmp (input_line_pointer, "bss\"", 4) == 0)
308 input_line_pointer += 4;
309 else if (strncmp (input_line_pointer, "data\"", 5) == 0)
310 input_line_pointer += 5;
313 char *p = input_line_pointer;
318 while (!is_end_of_line[(unsigned char) *input_line_pointer])
319 if (*input_line_pointer++ == '"')
321 c = *input_line_pointer;
322 *input_line_pointer = '\0';
323 as_bad (_("bad .common segment %s"), p);
324 *input_line_pointer = c;
325 ignore_rest_of_line ();
328 /* ??? Don't ask me why these are always global. */
333 input_line_pointer = save;
334 align = parse_align (is_local);
335 if (align == (addressT) -1)
342 bss_alloc (symbolP, size, align);
343 S_CLEAR_EXTERNAL (symbolP);
347 S_SET_VALUE (symbolP, size);
348 S_SET_ALIGN (symbolP, align);
349 S_SET_EXTERNAL (symbolP);
350 S_SET_SEGMENT (symbolP, elf_com_section_ptr);
353 symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
359 obj_elf_common (int is_common)
361 if (flag_mri && is_common)
364 s_comm_internal (0, elf_common_parse);
368 obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED)
370 symbolS *symbolP = s_comm_internal (0, elf_common_parse);
373 symbol_get_bfdsym (symbolP)->flags |= BSF_THREAD_LOCAL;
377 obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED)
379 symbolS *symbolP = s_comm_internal (0, s_lcomm_internal);
382 symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
386 obj_elf_local (int ignore ATTRIBUTE_UNUSED)
394 name = input_line_pointer;
395 c = get_symbol_end ();
396 symbolP = symbol_find_or_make (name);
397 *input_line_pointer = c;
399 S_CLEAR_EXTERNAL (symbolP);
400 symbol_get_obj (symbolP)->local = 1;
403 input_line_pointer++;
405 if (*input_line_pointer == '\n')
410 demand_empty_rest_of_line ();
414 obj_elf_weak (int ignore ATTRIBUTE_UNUSED)
422 name = input_line_pointer;
423 c = get_symbol_end ();
424 symbolP = symbol_find_or_make (name);
425 *input_line_pointer = c;
427 S_SET_WEAK (symbolP);
428 symbol_get_obj (symbolP)->local = 1;
431 input_line_pointer++;
433 if (*input_line_pointer == '\n')
438 demand_empty_rest_of_line ();
442 obj_elf_visibility (int visibility)
448 elf_symbol_type *elfsym;
452 name = input_line_pointer;
453 c = get_symbol_end ();
454 symbolP = symbol_find_or_make (name);
455 *input_line_pointer = c;
459 bfdsym = symbol_get_bfdsym (symbolP);
460 elfsym = elf_symbol_from (bfd_asymbol_bfd (bfdsym), bfdsym);
464 elfsym->internal_elf_sym.st_other &= ~3;
465 elfsym->internal_elf_sym.st_other |= visibility;
469 input_line_pointer ++;
473 if (*input_line_pointer == '\n')
479 demand_empty_rest_of_line ();
482 static segT previous_section;
483 static int previous_subsection;
487 struct section_stack *next;
489 int subseg, prev_subseg;
492 static struct section_stack *section_stack;
495 get_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
497 const char *gname = inf;
498 const char *group_name = elf_group_name (sec);
500 return (group_name == gname
501 || (group_name != NULL
503 && strcmp (group_name, gname) == 0));
506 /* Handle the .section pseudo-op. This code supports two different
509 The first is found on Solaris, and looks like
510 .section ".sec1",#alloc,#execinstr,#write
511 Here the names after '#' are the SHF_* flags to turn on for the
512 section. I'm not sure how it determines the SHT_* type (BFD
513 doesn't really give us control over the type, anyhow).
515 The second format is found on UnixWare, and probably most SVR4
516 machines, and looks like
517 .section .sec1,"a",@progbits
518 The quoted string may contain any combination of a, w, x, and
519 represents the SHF_* flags to turn on for the section. The string
520 beginning with '@' can be progbits or nobits. There should be
521 other possibilities, but I don't know what they are. In any case,
522 BFD doesn't really let us set the section type. */
525 obj_elf_change_section (const char *name,
529 const char *group_name,
536 const struct elf_backend_data *bed;
537 const struct bfd_elf_special_section *ssect;
539 #ifdef md_flush_pending_output
540 md_flush_pending_output ();
543 /* Switch to the section, creating it if necessary. */
546 struct section_stack *elt;
547 elt = xmalloc (sizeof (struct section_stack));
548 elt->next = section_stack;
550 elt->prev_seg = previous_section;
551 elt->subseg = now_subseg;
552 elt->prev_subseg = previous_subsection;
555 previous_section = now_seg;
556 previous_subsection = now_subseg;
558 old_sec = bfd_get_section_by_name_if (stdoutput, name, get_section,
559 (void *) group_name);
566 sec = subseg_force_new (name, 0);
568 bed = get_elf_backend_data (stdoutput);
569 ssect = (*bed->get_sec_type_attr) (stdoutput, sec);
573 bfd_boolean override = FALSE;
575 if (type == SHT_NULL)
577 else if (type != ssect->type)
580 /* FIXME: gcc, as of 2002-10-22, will emit
582 .section .init_array,"aw",@progbits
584 for __attribute__ ((section (".init_array"))).
585 "@progbits" is incorrect. Also for x86-64 large bss
586 sections, gcc, as of 2005-07-06, will emit
588 .section .lbss,"aw",@progbits
590 "@progbits" is incorrect. */
592 && (bed->s->arch_size != 64
593 || !(ssect->attr & SHF_X86_64_LARGE))
595 && ssect->type != SHT_INIT_ARRAY
596 && ssect->type != SHT_FINI_ARRAY
597 && ssect->type != SHT_PREINIT_ARRAY)
599 /* We allow to specify any type for a .note section. */
600 if (ssect->type != SHT_NOTE)
601 as_warn (_("setting incorrect section type for %s"),
606 as_warn (_("ignoring incorrect section type for %s"),
612 if (old_sec == NULL && (attr & ~ssect->attr) != 0)
614 /* As a GNU extension, we permit a .note section to be
615 allocatable. If the linker sees an allocatable .note
616 section, it will create a PT_NOTE segment in the output
617 file. We also allow "x" for .note.GNU-stack. */
618 if (ssect->type == SHT_NOTE
619 && (attr == SHF_ALLOC || attr == SHF_EXECINSTR))
621 /* Allow different SHF_MERGE and SHF_STRINGS if we have
622 something like .rodata.str. */
623 else if (ssect->suffix_length == -2
624 && name[ssect->prefix_length] == '.'
628 & ~SHF_STRINGS) == 0)
630 /* .interp, .strtab and .symtab can have SHF_ALLOC. */
631 else if (attr == SHF_ALLOC
632 && (strcmp (name, ".interp") == 0
633 || strcmp (name, ".strtab") == 0
634 || strcmp (name, ".symtab") == 0))
636 /* .note.GNU-stack can have SHF_EXECINSTR. */
637 else if (attr == SHF_EXECINSTR
638 && strcmp (name, ".note.GNU-stack") == 0)
641 /* A section on Alpha may have SHF_ALPHA_GPREL. */
642 else if ((attr & ~ssect->attr) == SHF_ALPHA_GPREL)
647 if (group_name == NULL)
648 as_warn (_("setting incorrect section attributes for %s"),
653 if (!override && old_sec == NULL)
657 /* Convert ELF type and flags to BFD flags. */
659 | ((attr & SHF_WRITE) ? 0 : SEC_READONLY)
660 | ((attr & SHF_ALLOC) ? SEC_ALLOC : 0)
661 | (((attr & SHF_ALLOC) && type != SHT_NOBITS) ? SEC_LOAD : 0)
662 | ((attr & SHF_EXECINSTR) ? SEC_CODE : 0)
663 | ((attr & SHF_MERGE) ? SEC_MERGE : 0)
664 | ((attr & SHF_STRINGS) ? SEC_STRINGS : 0)
665 | ((attr & SHF_TLS) ? SEC_THREAD_LOCAL : 0));
666 #ifdef md_elf_section_flags
667 flags = md_elf_section_flags (flags, attr, type);
671 flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
677 elf_section_type (sec) = type;
678 elf_section_flags (sec) = attr;
680 /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */
681 if (type == SHT_NOBITS)
682 seg_info (sec)->bss = 1;
684 bfd_set_section_flags (stdoutput, sec, flags);
685 if (flags & SEC_MERGE)
686 sec->entsize = entsize;
687 elf_group_name (sec) = group_name;
689 /* Add a symbol for this section to the symbol table. */
690 secsym = symbol_find (name);
692 symbol_set_bfdsym (secsym, sec->symbol);
694 symbol_table_insert (section_symbol (sec));
699 && (unsigned) type != elf_section_type (old_sec))
700 as_warn (_("ignoring changed section type for %s"), name);
704 /* If section attributes are specified the second time we see a
705 particular section, then check that they are the same as we
706 saw the first time. */
707 if (((old_sec->flags ^ flags)
708 & (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
709 | SEC_EXCLUDE | SEC_SORT_ENTRIES | SEC_MERGE | SEC_STRINGS
710 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
711 | SEC_THREAD_LOCAL)))
712 as_warn (_("ignoring changed section attributes for %s"), name);
713 if ((flags & SEC_MERGE) && old_sec->entsize != (unsigned) entsize)
714 as_warn (_("ignoring changed section entity size for %s"), name);
718 #ifdef md_elf_section_change_hook
719 md_elf_section_change_hook ();
724 obj_elf_parse_section_letters (char *str, size_t len)
739 attr |= SHF_EXECINSTR;
755 if (*(str - 1) == 'a')
758 if (len > 1 && str[1] == 's')
767 char *bad_msg = _("unrecognized .section attribute: want a,w,x,M,S,G,T");
768 #ifdef md_elf_section_letter
769 int md_attr = md_elf_section_letter (*str, &bad_msg);
774 as_fatal ("%s", bad_msg);
785 obj_elf_section_word (char *str, size_t len)
787 if (len == 5 && strncmp (str, "write", 5) == 0)
789 if (len == 5 && strncmp (str, "alloc", 5) == 0)
791 if (len == 9 && strncmp (str, "execinstr", 9) == 0)
792 return SHF_EXECINSTR;
793 if (len == 3 && strncmp (str, "tls", 3) == 0)
796 #ifdef md_elf_section_word
798 int md_attr = md_elf_section_word (str, len);
804 as_warn (_("unrecognized section attribute"));
809 obj_elf_section_type (char *str, size_t len)
811 if (len == 8 && strncmp (str, "progbits", 8) == 0)
813 if (len == 6 && strncmp (str, "nobits", 6) == 0)
815 if (len == 4 && strncmp (str, "note", 4) == 0)
817 if (len == 10 && strncmp (str, "init_array", 10) == 0)
818 return SHT_INIT_ARRAY;
819 if (len == 10 && strncmp (str, "fini_array", 10) == 0)
820 return SHT_FINI_ARRAY;
821 if (len == 13 && strncmp (str, "preinit_array", 13) == 0)
822 return SHT_PREINIT_ARRAY;
824 #ifdef md_elf_section_type
826 int md_type = md_elf_section_type (str, len);
832 as_warn (_("unrecognized section type"));
836 /* Get name of section. */
838 obj_elf_section_name (void)
843 if (*input_line_pointer == '"')
847 name = demand_copy_C_string (&dummy);
850 ignore_rest_of_line ();
856 char *end = input_line_pointer;
858 while (0 == strchr ("\n\t,; ", *end))
860 if (end == input_line_pointer)
862 as_bad (_("missing name"));
863 ignore_rest_of_line ();
867 name = xmalloc (end - input_line_pointer + 1);
868 memcpy (name, input_line_pointer, end - input_line_pointer);
869 name[end - input_line_pointer] = '\0';
870 #ifdef tc_canonicalize_section_name
871 name = tc_canonicalize_section_name (name);
873 input_line_pointer = end;
880 obj_elf_section (int push)
882 char *name, *group_name, *beg;
883 int type, attr, dummy;
886 subsegT new_subsection = -1;
893 #ifdef md_flush_pending_output
894 md_flush_pending_output ();
897 previous_section = now_seg;
898 previous_subsection = now_subseg;
900 s_mri_sect (&mri_type);
902 #ifdef md_elf_section_change_hook
903 md_elf_section_change_hook ();
908 #endif /* ! defined (TC_I370) */
910 name = obj_elf_section_name ();
919 if (*input_line_pointer == ',')
921 /* Skip the comma. */
922 ++input_line_pointer;
927 new_subsection = (subsegT) get_absolute_expression ();
929 else if (*input_line_pointer == '"')
931 beg = demand_copy_C_string (&dummy);
934 ignore_rest_of_line ();
937 attr |= obj_elf_parse_section_letters (beg, strlen (beg));
940 if (*input_line_pointer == ',')
943 char *save = input_line_pointer;
945 ++input_line_pointer;
947 c = *input_line_pointer;
950 beg = demand_copy_C_string (&dummy);
953 ignore_rest_of_line ();
956 type = obj_elf_section_type (beg, strlen (beg));
958 else if (c == '@' || c == '%')
960 beg = ++input_line_pointer;
961 c = get_symbol_end ();
962 *input_line_pointer = c;
963 type = obj_elf_section_type (beg, input_line_pointer - beg);
966 input_line_pointer = save;
970 if ((attr & SHF_MERGE) != 0 && *input_line_pointer == ',')
972 ++input_line_pointer;
974 entsize = get_absolute_expression ();
978 as_warn (_("invalid merge entity size"));
983 else if ((attr & SHF_MERGE) != 0)
985 as_warn (_("entity size for SHF_MERGE not specified"));
989 if ((attr & SHF_GROUP) != 0 && *input_line_pointer == ',')
991 ++input_line_pointer;
992 group_name = obj_elf_section_name ();
993 if (group_name == NULL)
995 else if (strncmp (input_line_pointer, ",comdat", 7) == 0)
997 input_line_pointer += 7;
1000 else if (strncmp (name, ".gnu.linkonce", 13) == 0)
1003 else if ((attr & SHF_GROUP) != 0)
1005 as_warn (_("group name for SHF_GROUP not specified"));
1016 if (*input_line_pointer != '#')
1018 as_bad (_("character following name is not '#'"));
1019 ignore_rest_of_line ();
1022 beg = ++input_line_pointer;
1023 c = get_symbol_end ();
1024 *input_line_pointer = c;
1026 attr |= obj_elf_section_word (beg, input_line_pointer - beg);
1030 while (*input_line_pointer++ == ',');
1031 --input_line_pointer;
1035 demand_empty_rest_of_line ();
1037 obj_elf_change_section (name, type, attr, entsize, group_name, linkonce, push);
1039 if (push && new_subsection != -1)
1040 subseg_set (now_seg, new_subsection);
1043 /* Change to the .data section. */
1046 obj_elf_data (int i)
1048 #ifdef md_flush_pending_output
1049 md_flush_pending_output ();
1052 previous_section = now_seg;
1053 previous_subsection = now_subseg;
1056 #ifdef md_elf_section_change_hook
1057 md_elf_section_change_hook ();
1061 /* Change to the .text section. */
1064 obj_elf_text (int i)
1066 #ifdef md_flush_pending_output
1067 md_flush_pending_output ();
1070 previous_section = now_seg;
1071 previous_subsection = now_subseg;
1074 #ifdef md_elf_section_change_hook
1075 md_elf_section_change_hook ();
1079 /* Change to the *ABS* section. */
1082 obj_elf_struct (int i)
1084 #ifdef md_flush_pending_output
1085 md_flush_pending_output ();
1088 previous_section = now_seg;
1089 previous_subsection = now_subseg;
1092 #ifdef md_elf_section_change_hook
1093 md_elf_section_change_hook ();
1098 obj_elf_subsection (int ignore ATTRIBUTE_UNUSED)
1102 #ifdef md_flush_pending_output
1103 md_flush_pending_output ();
1106 previous_section = now_seg;
1107 previous_subsection = now_subseg;
1109 temp = get_absolute_expression ();
1110 subseg_set (now_seg, (subsegT) temp);
1111 demand_empty_rest_of_line ();
1113 #ifdef md_elf_section_change_hook
1114 md_elf_section_change_hook ();
1118 /* This can be called from the processor backends if they change
1122 obj_elf_section_change_hook (void)
1124 previous_section = now_seg;
1125 previous_subsection = now_subseg;
1129 obj_elf_previous (int ignore ATTRIBUTE_UNUSED)
1134 if (previous_section == 0)
1136 as_warn (_(".previous without corresponding .section; ignored"));
1140 #ifdef md_flush_pending_output
1141 md_flush_pending_output ();
1144 new_section = previous_section;
1145 new_subsection = previous_subsection;
1146 previous_section = now_seg;
1147 previous_subsection = now_subseg;
1148 subseg_set (new_section, new_subsection);
1150 #ifdef md_elf_section_change_hook
1151 md_elf_section_change_hook ();
1156 obj_elf_popsection (int xxx ATTRIBUTE_UNUSED)
1158 struct section_stack *top = section_stack;
1162 as_warn (_(".popsection without corresponding .pushsection; ignored"));
1166 #ifdef md_flush_pending_output
1167 md_flush_pending_output ();
1170 section_stack = top->next;
1171 previous_section = top->prev_seg;
1172 previous_subsection = top->prev_subseg;
1173 subseg_set (top->seg, top->subseg);
1176 #ifdef md_elf_section_change_hook
1177 md_elf_section_change_hook ();
1182 obj_elf_line (int ignore ATTRIBUTE_UNUSED)
1184 /* Assume delimiter is part of expression. BSD4.2 as fails with
1185 delightful bug, so we are not being incompatible here. */
1186 new_logical_line (NULL, get_absolute_expression ());
1187 demand_empty_rest_of_line ();
1190 /* This handles the .symver pseudo-op, which is used to specify a
1191 symbol version. The syntax is ``.symver NAME,SYMVERNAME''.
1192 SYMVERNAME may contain ELF_VER_CHR ('@') characters. This
1193 pseudo-op causes the assembler to emit a symbol named SYMVERNAME
1194 with the same value as the symbol NAME. */
1197 obj_elf_symver (int ignore ATTRIBUTE_UNUSED)
1204 name = input_line_pointer;
1205 c = get_symbol_end ();
1207 sym = symbol_find_or_make (name);
1209 *input_line_pointer = c;
1212 if (*input_line_pointer != ',')
1214 as_bad (_("expected comma after name in .symver"));
1215 ignore_rest_of_line ();
1219 ++input_line_pointer;
1221 name = input_line_pointer;
1223 /* Temporarily include '@' in symbol names. */
1224 old_lexat = lex_type[(unsigned char) '@'];
1225 lex_type[(unsigned char) '@'] |= LEX_NAME;
1226 c = get_symbol_end ();
1227 lex_type[(unsigned char) '@'] = old_lexat;
1229 if (symbol_get_obj (sym)->versioned_name == NULL)
1231 symbol_get_obj (sym)->versioned_name = xstrdup (name);
1233 *input_line_pointer = c;
1235 if (strchr (symbol_get_obj (sym)->versioned_name,
1236 ELF_VER_CHR) == NULL)
1238 as_bad (_("missing version name in `%s' for symbol `%s'"),
1239 symbol_get_obj (sym)->versioned_name,
1241 ignore_rest_of_line ();
1247 if (strcmp (symbol_get_obj (sym)->versioned_name, name))
1249 as_bad (_("multiple versions [`%s'|`%s'] for symbol `%s'"),
1250 name, symbol_get_obj (sym)->versioned_name,
1252 ignore_rest_of_line ();
1256 *input_line_pointer = c;
1259 demand_empty_rest_of_line ();
1262 /* This handles the .vtable_inherit pseudo-op, which is used to indicate
1263 to the linker the hierarchy in which a particular table resides. The
1264 syntax is ".vtable_inherit CHILDNAME, PARENTNAME". */
1267 obj_elf_vtable_inherit (int ignore ATTRIBUTE_UNUSED)
1269 char *cname, *pname;
1270 symbolS *csym, *psym;
1273 if (*input_line_pointer == '#')
1274 ++input_line_pointer;
1276 cname = input_line_pointer;
1277 c = get_symbol_end ();
1278 csym = symbol_find (cname);
1280 /* GCFIXME: should check that we don't have two .vtable_inherits for
1281 the same child symbol. Also, we can currently only do this if the
1282 child symbol is already exists and is placed in a fragment. */
1284 if (csym == NULL || symbol_get_frag (csym) == NULL)
1286 as_bad (_("expected `%s' to have already been set for .vtable_inherit"),
1291 *input_line_pointer = c;
1294 if (*input_line_pointer != ',')
1296 as_bad (_("expected comma after name in .vtable_inherit"));
1297 ignore_rest_of_line ();
1301 ++input_line_pointer;
1304 if (*input_line_pointer == '#')
1305 ++input_line_pointer;
1307 if (input_line_pointer[0] == '0'
1308 && (input_line_pointer[1] == '\0'
1309 || ISSPACE (input_line_pointer[1])))
1311 psym = section_symbol (absolute_section);
1312 ++input_line_pointer;
1316 pname = input_line_pointer;
1317 c = get_symbol_end ();
1318 psym = symbol_find_or_make (pname);
1319 *input_line_pointer = c;
1322 demand_empty_rest_of_line ();
1327 assert (symbol_get_value_expression (csym)->X_op == O_constant);
1328 return fix_new (symbol_get_frag (csym),
1329 symbol_get_value_expression (csym)->X_add_number,
1330 0, psym, 0, 0, BFD_RELOC_VTABLE_INHERIT);
1333 /* This handles the .vtable_entry pseudo-op, which is used to indicate
1334 to the linker that a vtable slot was used. The syntax is
1335 ".vtable_entry tablename, offset". */
1338 obj_elf_vtable_entry (int ignore ATTRIBUTE_UNUSED)
1345 if (*input_line_pointer == '#')
1346 ++input_line_pointer;
1348 name = input_line_pointer;
1349 c = get_symbol_end ();
1350 sym = symbol_find_or_make (name);
1351 *input_line_pointer = c;
1354 if (*input_line_pointer != ',')
1356 as_bad (_("expected comma after name in .vtable_entry"));
1357 ignore_rest_of_line ();
1361 ++input_line_pointer;
1362 if (*input_line_pointer == '#')
1363 ++input_line_pointer;
1365 offset = get_absolute_expression ();
1367 demand_empty_rest_of_line ();
1369 return fix_new (frag_now, frag_now_fix (), 0, sym, offset, 0,
1370 BFD_RELOC_VTABLE_ENTRY);
1374 elf_obj_read_begin_hook (void)
1376 #ifdef NEED_ECOFF_DEBUG
1377 if (ECOFF_DEBUGGING)
1378 ecoff_read_begin_hook ();
1383 elf_obj_symbol_new_hook (symbolS *symbolP)
1385 struct elf_obj_sy *sy_obj;
1387 sy_obj = symbol_get_obj (symbolP);
1388 sy_obj->size = NULL;
1389 sy_obj->versioned_name = NULL;
1391 #ifdef NEED_ECOFF_DEBUG
1392 if (ECOFF_DEBUGGING)
1393 ecoff_symbol_new_hook (symbolP);
1397 /* When setting one symbol equal to another, by default we probably
1398 want them to have the same "size", whatever it means in the current
1402 elf_copy_symbol_attributes (symbolS *dest, symbolS *src)
1404 struct elf_obj_sy *srcelf = symbol_get_obj (src);
1405 struct elf_obj_sy *destelf = symbol_get_obj (dest);
1408 if (destelf->size == NULL)
1409 destelf->size = xmalloc (sizeof (expressionS));
1410 *destelf->size = *srcelf->size;
1414 if (destelf->size != NULL)
1415 free (destelf->size);
1416 destelf->size = NULL;
1418 S_SET_SIZE (dest, S_GET_SIZE (src));
1419 /* Don't copy visibility. */
1420 S_SET_OTHER (dest, (ELF_ST_VISIBILITY (S_GET_OTHER (dest))
1421 | (S_GET_OTHER (src) & ~ELF_ST_VISIBILITY (-1))));
1425 obj_elf_version (int ignore ATTRIBUTE_UNUSED)
1430 asection *seg = now_seg;
1431 subsegT subseg = now_subseg;
1432 Elf_Internal_Note i_note;
1433 Elf_External_Note e_note;
1434 asection *note_secp = NULL;
1437 if (*input_line_pointer == '\"')
1441 ++input_line_pointer; /* -> 1st char of string. */
1442 name = input_line_pointer;
1444 while (is_a_char (c = next_char_of_string ()))
1446 c = *input_line_pointer;
1447 *input_line_pointer = '\0';
1448 *(input_line_pointer - 1) = '\0';
1449 *input_line_pointer = c;
1451 /* Create the .note section. */
1452 note_secp = subseg_new (".note", 0);
1453 bfd_set_section_flags (stdoutput,
1455 SEC_HAS_CONTENTS | SEC_READONLY);
1457 /* Process the version string. */
1458 len = strlen (name) + 1;
1460 /* PR 3456: Although the name field is padded out to an 4-byte
1461 boundary, the namesz field should not be adjusted. */
1462 i_note.namesz = len;
1463 i_note.descsz = 0; /* No description. */
1464 i_note.type = NT_VERSION;
1465 p = frag_more (sizeof (e_note.namesz));
1466 md_number_to_chars (p, i_note.namesz, sizeof (e_note.namesz));
1467 p = frag_more (sizeof (e_note.descsz));
1468 md_number_to_chars (p, i_note.descsz, sizeof (e_note.descsz));
1469 p = frag_more (sizeof (e_note.type));
1470 md_number_to_chars (p, i_note.type, sizeof (e_note.type));
1471 p = frag_more (len);
1472 memcpy (p, name, len);
1474 frag_align (2, 0, 0);
1476 subseg_set (seg, subseg);
1479 as_bad (_("expected quoted string"));
1481 demand_empty_rest_of_line ();
1485 obj_elf_size (int ignore ATTRIBUTE_UNUSED)
1487 char *name = input_line_pointer;
1488 char c = get_symbol_end ();
1493 p = input_line_pointer;
1496 if (*input_line_pointer != ',')
1499 as_bad (_("expected comma after name `%s' in .size directive"), name);
1501 ignore_rest_of_line ();
1504 input_line_pointer++;
1506 if (exp.X_op == O_absent)
1508 as_bad (_("missing expression in .size directive"));
1509 exp.X_op = O_constant;
1510 exp.X_add_number = 0;
1513 sym = symbol_find_or_make (name);
1515 if (exp.X_op == O_constant)
1517 S_SET_SIZE (sym, exp.X_add_number);
1518 if (symbol_get_obj (sym)->size)
1520 xfree (symbol_get_obj (sym)->size);
1521 symbol_get_obj (sym)->size = NULL;
1526 symbol_get_obj (sym)->size = xmalloc (sizeof (expressionS));
1527 *symbol_get_obj (sym)->size = exp;
1529 demand_empty_rest_of_line ();
1532 /* Handle the ELF .type pseudo-op. This sets the type of a symbol.
1533 There are five syntaxes:
1535 The first (used on Solaris) is
1537 The second (used on UnixWare) is
1539 The third (reportedly to be used on Irix 6.0) is
1541 The fourth (used on NetBSD/Arm and Linux/ARM) is
1543 The fifth (used on SVR4/860) is
1544 .type SYM,"function"
1548 obj_elf_type (int ignore ATTRIBUTE_UNUSED)
1553 const char *typename;
1555 elf_symbol_type *elfsym;
1557 name = input_line_pointer;
1558 c = get_symbol_end ();
1559 sym = symbol_find_or_make (name);
1560 elfsym = (elf_symbol_type *) symbol_get_bfdsym (sym);
1561 *input_line_pointer = c;
1564 if (*input_line_pointer == ',')
1565 ++input_line_pointer;
1568 if ( *input_line_pointer == '#'
1569 || *input_line_pointer == '@'
1570 || *input_line_pointer == '"'
1571 || *input_line_pointer == '%')
1572 ++input_line_pointer;
1574 typename = input_line_pointer;
1575 c = get_symbol_end ();
1578 if (strcmp (typename, "function") == 0
1579 || strcmp (typename, "STT_FUNC") == 0)
1580 type = BSF_FUNCTION;
1581 else if (strcmp (typename, "object") == 0
1582 || strcmp (typename, "STT_OBJECT") == 0)
1584 else if (strcmp (typename, "tls_object") == 0
1585 || strcmp (typename, "STT_TLS") == 0)
1586 type = BSF_OBJECT | BSF_THREAD_LOCAL;
1587 else if (strcmp (typename, "notype") == 0
1588 || strcmp (typename, "STT_NOTYPE") == 0)
1590 #ifdef md_elf_symbol_type
1591 else if ((type = md_elf_symbol_type (typename, sym, elfsym)) != -1)
1595 as_bad (_("unrecognized symbol type \"%s\""), typename);
1597 *input_line_pointer = c;
1599 if (*input_line_pointer == '"')
1600 ++input_line_pointer;
1602 elfsym->symbol.flags |= type;
1604 demand_empty_rest_of_line ();
1608 obj_elf_ident (int ignore ATTRIBUTE_UNUSED)
1610 static segT comment_section;
1611 segT old_section = now_seg;
1612 int old_subsection = now_subseg;
1614 #ifdef md_flush_pending_output
1615 md_flush_pending_output ();
1618 if (!comment_section)
1621 comment_section = subseg_new (".comment", 0);
1622 bfd_set_section_flags (stdoutput, comment_section,
1623 SEC_READONLY | SEC_HAS_CONTENTS);
1628 subseg_set (comment_section, 0);
1630 subseg_set (old_section, old_subsection);
1633 #ifdef INIT_STAB_SECTION
1635 /* The first entry in a .stabs section is special. */
1638 obj_elf_init_stab_section (segT seg)
1643 unsigned int stroff;
1645 /* Force the section to align to a longword boundary. Without this,
1646 UnixWare ar crashes. */
1647 bfd_set_section_alignment (stdoutput, seg, 2);
1649 /* Make space for this first symbol. */
1653 as_where (&file, NULL);
1654 stabstr_name = xmalloc (strlen (segment_name (seg)) + 4);
1655 strcpy (stabstr_name, segment_name (seg));
1656 strcat (stabstr_name, "str");
1657 stroff = get_stab_string_offset (file, stabstr_name);
1659 md_number_to_chars (p, stroff, 4);
1660 seg_info (seg)->stabu.p = p;
1665 /* Fill in the counts in the first entry in a .stabs section. */
1668 adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1675 if (strncmp (".stab", sec->name, 5))
1677 if (!strcmp ("str", sec->name + strlen (sec->name) - 3))
1680 name = alloca (strlen (sec->name) + 4);
1681 strcpy (name, sec->name);
1682 strcat (name, "str");
1683 strsec = bfd_get_section_by_name (abfd, name);
1685 strsz = bfd_section_size (abfd, strsec);
1688 nsyms = bfd_section_size (abfd, sec) / 12 - 1;
1690 p = seg_info (sec)->stabu.p;
1693 bfd_h_put_16 (abfd, nsyms, p + 6);
1694 bfd_h_put_32 (abfd, strsz, p + 8);
1697 #ifdef NEED_ECOFF_DEBUG
1699 /* This function is called by the ECOFF code. It is supposed to
1700 record the external symbol information so that the backend can
1701 write it out correctly. The ELF backend doesn't actually handle
1702 this at the moment, so we do it ourselves. We save the information
1705 #ifdef OBJ_MAYBE_ELF
1709 elf_ecoff_set_ext (symbolS *sym, struct ecoff_extr *ext)
1711 symbol_get_bfdsym (sym)->udata.p = ext;
1714 /* This function is called by bfd_ecoff_debug_externals. It is
1715 supposed to *EXT to the external symbol information, and return
1716 whether the symbol should be used at all. */
1719 elf_get_extr (asymbol *sym, EXTR *ext)
1721 if (sym->udata.p == NULL)
1723 *ext = *(EXTR *) sym->udata.p;
1727 /* This function is called by bfd_ecoff_debug_externals. It has
1728 nothing to do for ELF. */
1731 elf_set_index (asymbol *sym ATTRIBUTE_UNUSED,
1732 bfd_size_type indx ATTRIBUTE_UNUSED)
1736 #endif /* NEED_ECOFF_DEBUG */
1739 elf_frob_symbol (symbolS *symp, int *puntp)
1741 struct elf_obj_sy *sy_obj;
1743 #ifdef NEED_ECOFF_DEBUG
1744 if (ECOFF_DEBUGGING)
1745 ecoff_frob_symbol (symp);
1748 sy_obj = symbol_get_obj (symp);
1750 if (sy_obj->size != NULL)
1752 switch (sy_obj->size->X_op)
1756 (S_GET_VALUE (sy_obj->size->X_add_symbol)
1757 + sy_obj->size->X_add_number
1758 - S_GET_VALUE (sy_obj->size->X_op_symbol)));
1762 (S_GET_VALUE (sy_obj->size->X_add_symbol)
1763 + sy_obj->size->X_add_number));
1766 as_bad (_(".size expression too complicated to fix up"));
1769 free (sy_obj->size);
1770 sy_obj->size = NULL;
1773 if (sy_obj->versioned_name != NULL)
1777 p = strchr (sy_obj->versioned_name, ELF_VER_CHR);
1780 /* This symbol was given a new name with the .symver directive.
1782 If this is an external reference, just rename the symbol to
1783 include the version string. This will make the relocs be
1784 against the correct versioned symbol.
1786 If this is a definition, add an alias. FIXME: Using an alias
1787 will permit the debugging information to refer to the right
1788 symbol. However, it's not clear whether it is the best
1791 if (! S_IS_DEFINED (symp))
1793 /* Verify that the name isn't using the @@ syntax--this is
1794 reserved for definitions of the default version to link
1796 if (p[1] == ELF_VER_CHR)
1798 as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"),
1799 sy_obj->versioned_name);
1802 S_SET_NAME (symp, sy_obj->versioned_name);
1806 if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR)
1810 /* The @@@ syntax is a special case. It renames the
1811 symbol name to versioned_name with one `@' removed. */
1812 l = strlen (&p[3]) + 1;
1813 memmove (&p[2], &p[3], l);
1814 S_SET_NAME (symp, sy_obj->versioned_name);
1820 /* FIXME: Creating a new symbol here is risky. We're
1821 in the final loop over the symbol table. We can
1822 get away with it only because the symbol goes to
1823 the end of the list, where the loop will still see
1824 it. It would probably be better to do this in
1825 obj_frob_file_before_adjust. */
1827 symp2 = symbol_find_or_make (sy_obj->versioned_name);
1829 /* Now we act as though we saw symp2 = sym. */
1831 S_SET_SEGMENT (symp2, S_GET_SEGMENT (symp));
1833 /* Subtracting out the frag address here is a hack
1834 because we are in the middle of the final loop. */
1837 - symbol_get_frag (symp)->fr_address));
1839 symbol_set_frag (symp2, symbol_get_frag (symp));
1841 /* This will copy over the size information. */
1842 copy_symbol_attributes (symp2, symp);
1844 S_SET_OTHER (symp2, S_GET_OTHER (symp));
1846 if (S_IS_WEAK (symp))
1849 if (S_IS_EXTERNAL (symp))
1850 S_SET_EXTERNAL (symp2);
1855 /* Double check weak symbols. */
1856 if (S_IS_WEAK (symp))
1858 if (S_IS_COMMON (symp))
1859 as_bad (_("symbol `%s' can not be both weak and common"),
1864 /* The Irix 5 and 6 assemblers set the type of any common symbol and
1865 any undefined non-function symbol to STT_OBJECT. We try to be
1866 compatible, since newer Irix 5 and 6 linkers care. However, we
1867 only set undefined symbols to be STT_OBJECT if we are on Irix,
1868 because that is the only time gcc will generate the necessary
1869 .global directives to mark functions. */
1871 if (S_IS_COMMON (symp))
1872 symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;
1874 if (strstr (TARGET_OS, "irix") != NULL
1875 && ! S_IS_DEFINED (symp)
1876 && (symbol_get_bfdsym (symp)->flags & BSF_FUNCTION) == 0)
1877 symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;
1883 asection **head; /* Section lists. */
1884 unsigned int *elt_count; /* Number of sections in each list. */
1885 unsigned int num_group; /* Number of lists. */
1888 /* Called via bfd_map_over_sections. If SEC is a member of a group,
1889 add it to a list of sections belonging to the group. INF is a
1890 pointer to a struct group_list, which is where we store the head of
1894 build_group_lists (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
1896 struct group_list *list = inf;
1897 const char *group_name = elf_group_name (sec);
1900 if (group_name == NULL)
1903 /* If this group already has a list, add the section to the head of
1905 for (i = 0; i < list->num_group; i++)
1907 if (strcmp (group_name, elf_group_name (list->head[i])) == 0)
1909 elf_next_in_group (sec) = list->head[i];
1910 list->head[i] = sec;
1911 list->elt_count[i] += 1;
1916 /* New group. Make the arrays bigger in chunks to minimize calls to
1918 i = list->num_group;
1921 unsigned int newsize = i + 128;
1922 list->head = xrealloc (list->head, newsize * sizeof (*list->head));
1923 list->elt_count = xrealloc (list->elt_count,
1924 newsize * sizeof (*list->elt_count));
1926 list->head[i] = sec;
1927 list->elt_count[i] = 1;
1928 list->num_group += 1;
1932 elf_frob_file (void)
1934 struct group_list list;
1937 bfd_map_over_sections (stdoutput, adjust_stab_sections, NULL);
1939 /* Go find section groups. */
1942 list.elt_count = NULL;
1943 bfd_map_over_sections (stdoutput, build_group_lists, &list);
1945 /* Make the SHT_GROUP sections that describe each section group. We
1946 can't set up the section contents here yet, because elf section
1947 indices have yet to be calculated. elf.c:set_group_contents does
1948 the rest of the work. */
1949 for (i = 0; i < list.num_group; i++)
1951 const char *group_name = elf_group_name (list.head[i]);
1952 const char *sec_name;
1959 flags = SEC_READONLY | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_GROUP;
1960 for (s = list.head[i]; s != NULL; s = elf_next_in_group (s))
1961 if ((s->flags ^ flags) & SEC_LINK_ONCE)
1963 flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
1964 if (s != list.head[i])
1966 as_warn (_("assuming all members of group `%s' are COMDAT"),
1972 sec_name = group_name;
1973 sy = symbol_find_exact (group_name);
1976 && (sy == symbol_lastP
1977 || (sy->sy_next != NULL
1978 && sy->sy_next->sy_previous == sy)))
1981 sec_name = ".group";
1983 s = subseg_force_new (sec_name, 0);
1985 || !bfd_set_section_flags (stdoutput, s, flags)
1986 || !bfd_set_section_alignment (stdoutput, s, 2))
1988 as_fatal (_("can't create group: %s"),
1989 bfd_errmsg (bfd_get_error ()));
1991 elf_section_type (s) = SHT_GROUP;
1993 /* Pass a pointer to the first section in this group. */
1994 elf_next_in_group (s) = list.head[i];
1996 elf_group_id (s) = sy->bsym;
1998 size = 4 * (list.elt_count[i] + 1);
1999 bfd_set_section_size (stdoutput, s, size);
2000 s->contents = (unsigned char *) frag_more (size);
2001 frag_now->fr_fix = frag_now_fix_octets ();
2002 frag_wane (frag_now);
2005 #ifdef elf_tc_final_processing
2006 elf_tc_final_processing ();
2010 /* It removes any unneeded versioned symbols from the symbol table. */
2013 elf_frob_file_before_adjust (void)
2019 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
2020 if (!S_IS_DEFINED (symp))
2022 if (symbol_get_obj (symp)->versioned_name)
2026 /* The @@@ syntax is a special case. If the symbol is
2027 not defined, 2 `@'s will be removed from the
2030 p = strchr (symbol_get_obj (symp)->versioned_name,
2033 if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR)
2035 size_t l = strlen (&p[3]) + 1;
2036 memmove (&p[1], &p[3], l);
2038 if (symbol_used_p (symp) == 0
2039 && symbol_used_in_reloc_p (symp) == 0)
2040 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2043 /* If there was .weak foo, but foo was neither defined nor
2044 used anywhere, remove it. */
2046 else if (S_IS_WEAK (symp)
2047 && symbol_used_p (symp) == 0
2048 && symbol_used_in_reloc_p (symp) == 0)
2049 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2054 /* It is required that we let write_relocs have the opportunity to
2055 optimize away fixups before output has begun, since it is possible
2056 to eliminate all fixups for a section and thus we never should
2057 have generated the relocation section. */
2060 elf_frob_file_after_relocs (void)
2062 #ifdef NEED_ECOFF_DEBUG
2063 if (ECOFF_DEBUGGING)
2064 /* Generate the ECOFF debugging information. */
2066 const struct ecoff_debug_swap *debug_swap;
2067 struct ecoff_debug_info debug;
2072 = get_elf_backend_data (stdoutput)->elf_backend_ecoff_debug_swap;
2073 know (debug_swap != NULL);
2074 ecoff_build_debug (&debug.symbolic_header, &buf, debug_swap);
2076 /* Set up the pointers in debug. */
2077 #define SET(ptr, offset, type) \
2078 debug.ptr = (type) (buf + debug.symbolic_header.offset)
2080 SET (line, cbLineOffset, unsigned char *);
2081 SET (external_dnr, cbDnOffset, void *);
2082 SET (external_pdr, cbPdOffset, void *);
2083 SET (external_sym, cbSymOffset, void *);
2084 SET (external_opt, cbOptOffset, void *);
2085 SET (external_aux, cbAuxOffset, union aux_ext *);
2086 SET (ss, cbSsOffset, char *);
2087 SET (external_fdr, cbFdOffset, void *);
2088 SET (external_rfd, cbRfdOffset, void *);
2089 /* ssext and external_ext are set up just below. */
2093 /* Set up the external symbols. */
2094 debug.ssext = debug.ssext_end = NULL;
2095 debug.external_ext = debug.external_ext_end = NULL;
2096 if (! bfd_ecoff_debug_externals (stdoutput, &debug, debug_swap, TRUE,
2097 elf_get_extr, elf_set_index))
2098 as_fatal (_("failed to set up debugging information: %s"),
2099 bfd_errmsg (bfd_get_error ()));
2101 sec = bfd_get_section_by_name (stdoutput, ".mdebug");
2102 assert (sec != NULL);
2104 know (!stdoutput->output_has_begun);
2106 /* We set the size of the section, call bfd_set_section_contents
2107 to force the ELF backend to allocate a file position, and then
2108 write out the data. FIXME: Is this really the best way to do
2110 bfd_set_section_size
2111 (stdoutput, sec, bfd_ecoff_debug_size (stdoutput, &debug, debug_swap));
2113 /* Pass BUF to bfd_set_section_contents because this will
2114 eventually become a call to fwrite, and ISO C prohibits
2115 passing a NULL pointer to a stdio function even if the
2116 pointer will not be used. */
2117 if (! bfd_set_section_contents (stdoutput, sec, buf, 0, 0))
2118 as_fatal (_("can't start writing .mdebug section: %s"),
2119 bfd_errmsg (bfd_get_error ()));
2121 know (stdoutput->output_has_begun);
2122 know (sec->filepos != 0);
2124 if (! bfd_ecoff_write_debug (stdoutput, &debug, debug_swap,
2126 as_fatal (_("could not write .mdebug section: %s"),
2127 bfd_errmsg (bfd_get_error ()));
2129 #endif /* NEED_ECOFF_DEBUG */
2134 /* Heavily plagiarized from obj_elf_version. The idea is to emit the
2135 SCO specific identifier in the .notes section to satisfy the SCO
2138 This looks more complicated than it really is. As opposed to the
2139 "obvious" solution, this should handle the cross dev cases
2140 correctly. (i.e, hosting on a 64 bit big endian processor, but
2141 generating SCO Elf code) Efficiency isn't a concern, as there
2142 should be exactly one of these sections per object module.
2144 SCO OpenServer 5 identifies it's ELF modules with a standard ELF
2147 int_32 namesz = 4 ; Name size
2148 int_32 descsz = 12 ; Descriptive information
2150 char name[4] = "SCO" ; Originator name ALWAYS SCO + NULL
2151 int_32 version = (major ver # << 16) | version of tools ;
2152 int_32 source = (tool_id << 16 ) | 1 ;
2153 int_32 info = 0 ; These are set by the SCO tools, but we
2154 don't know enough about the source
2155 environment to set them. SCO ld currently
2156 ignores them, and recommends we set them
2159 #define SCO_MAJOR_VERSION 0x1
2160 #define SCO_MINOR_VERSION 0x1
2170 asection *seg = now_seg;
2171 subsegT subseg = now_subseg;
2172 Elf_Internal_Note i_note;
2173 Elf_External_Note e_note;
2174 asection *note_secp = NULL;
2177 /* create the .note section */
2179 note_secp = subseg_new (".note", 0);
2180 bfd_set_section_flags (stdoutput,
2182 SEC_HAS_CONTENTS | SEC_READONLY);
2184 /* process the version string */
2187 i_note.descsz = 12; /* 12 descriptive bytes */
2188 i_note.type = NT_VERSION; /* Contains a version string */
2190 p = frag_more (sizeof (i_note.namesz));
2191 md_number_to_chars (p, i_note.namesz, 4);
2193 p = frag_more (sizeof (i_note.descsz));
2194 md_number_to_chars (p, i_note.descsz, 4);
2196 p = frag_more (sizeof (i_note.type));
2197 md_number_to_chars (p, i_note.type, 4);
2202 /* Note: this is the version number of the ELF we're representing */
2204 md_number_to_chars (p, (SCO_MAJOR_VERSION << 16) | (SCO_MINOR_VERSION), 4);
2206 /* Here, we pick a magic number for ourselves (yes, I "registered"
2207 it with SCO. The bottom bit shows that we are compat with the
2210 md_number_to_chars (p, 0x4c520000 | 0x0001, 4);
2212 /* If we knew (or cared) what the source language options were, we'd
2213 fill them in here. SCO has given us permission to ignore these
2214 and just set them to zero. */
2216 md_number_to_chars (p, 0x0000, 4);
2218 frag_align (2, 0, 0);
2220 /* We probably can't restore the current segment, for there likely
2223 subseg_set (seg, subseg);
2227 #endif /* SCO_ELF */
2230 elf_separate_stab_sections (void)
2232 #ifdef NEED_ECOFF_DEBUG
2233 return (!ECOFF_DEBUGGING);
2240 elf_init_stab_section (segT seg)
2242 #ifdef NEED_ECOFF_DEBUG
2243 if (!ECOFF_DEBUGGING)
2245 obj_elf_init_stab_section (seg);
2248 const struct format_ops elf_format_ops =
2250 bfd_target_elf_flavour,
2251 0, /* dfl_leading_underscore */
2252 1, /* emit_section_symbols */
2257 elf_frob_file_before_adjust,
2258 0, /* obj_frob_file_before_fix */
2259 elf_frob_file_after_relocs,
2260 elf_s_get_size, elf_s_set_size,
2261 elf_s_get_align, elf_s_set_align,
2268 elf_copy_symbol_attributes,
2269 #ifdef NEED_ECOFF_DEBUG
2270 ecoff_generate_asm_lineno,
2273 0, /* generate_asm_lineno */
2274 0, /* process_stab */
2276 elf_separate_stab_sections,
2277 elf_init_stab_section,
2278 elf_sec_sym_ok_for_reloc,
2280 #ifdef NEED_ECOFF_DEBUG
2283 0, /* ecoff_set_ext */
2285 elf_obj_read_begin_hook,
2286 elf_obj_symbol_new_hook