1 /* ELF object file format
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 2,
10 or (at your option) any later version.
12 GAS is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 the GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
22 #define OBJ_HEADER "obj-elf.h"
24 #include "safe-ctype.h"
27 #include "struc-symbol.h"
28 #include "dwarf2dbg.h"
30 #ifndef ECOFF_DEBUGGING
31 #define ECOFF_DEBUGGING 0
33 #define NEED_ECOFF_DEBUG
36 #ifdef NEED_ECOFF_DEBUG
41 #include "elf/alpha.h"
57 #include "elf/x86-64.h"
64 static void obj_elf_line (int);
65 static void obj_elf_size (int);
66 static void obj_elf_type (int);
67 static void obj_elf_ident (int);
68 static void obj_elf_weak (int);
69 static void obj_elf_local (int);
70 static void obj_elf_visibility (int);
71 static void obj_elf_symver (int);
72 static void obj_elf_subsection (int);
73 static void obj_elf_popsection (int);
74 static void obj_elf_tls_common (int);
75 static void obj_elf_lcomm (int);
76 static void obj_elf_struct (int);
78 static const pseudo_typeS elf_pseudo_table[] =
80 {"comm", obj_elf_common, 0},
81 {"common", obj_elf_common, 1},
82 {"ident", obj_elf_ident, 0},
83 {"lcomm", obj_elf_lcomm, 0},
84 {"local", obj_elf_local, 0},
85 {"previous", obj_elf_previous, 0},
86 {"section", obj_elf_section, 0},
87 {"section.s", obj_elf_section, 0},
88 {"sect", obj_elf_section, 0},
89 {"sect.s", obj_elf_section, 0},
90 {"pushsection", obj_elf_section, 1},
91 {"popsection", obj_elf_popsection, 0},
92 {"size", obj_elf_size, 0},
93 {"type", obj_elf_type, 0},
94 {"version", obj_elf_version, 0},
95 {"weak", obj_elf_weak, 0},
97 /* These define symbol visibility. */
98 {"internal", obj_elf_visibility, STV_INTERNAL},
99 {"hidden", obj_elf_visibility, STV_HIDDEN},
100 {"protected", obj_elf_visibility, STV_PROTECTED},
102 /* These are used for stabs-in-elf configurations. */
103 {"line", obj_elf_line, 0},
105 /* This is a GNU extension to handle symbol versions. */
106 {"symver", obj_elf_symver, 0},
108 /* A GNU extension to change subsection only. */
109 {"subsection", obj_elf_subsection, 0},
111 /* These are GNU extensions to aid in garbage collecting C++ vtables. */
112 {"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit, 0},
113 {"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry, 0},
115 /* These are used for dwarf. */
119 /* These are used for dwarf2. */
120 { "file", (void (*) (int)) dwarf2_directive_file, 0 },
121 { "loc", dwarf2_directive_loc, 0 },
122 { "loc_mark_labels", dwarf2_directive_loc_mark_labels, 0 },
124 /* We need to trap the section changing calls to handle .previous. */
125 {"data", obj_elf_data, 0},
126 {"offset", obj_elf_struct, 0},
127 {"struct", obj_elf_struct, 0},
128 {"text", obj_elf_text, 0},
130 {"tls_common", obj_elf_tls_common, 0},
136 static const pseudo_typeS ecoff_debug_pseudo_table[] =
138 #ifdef NEED_ECOFF_DEBUG
139 /* COFF style debugging information for ECOFF. .ln is not used; .loc
141 { "def", ecoff_directive_def, 0 },
142 { "dim", ecoff_directive_dim, 0 },
143 { "endef", ecoff_directive_endef, 0 },
144 { "file", ecoff_directive_file, 0 },
145 { "scl", ecoff_directive_scl, 0 },
146 { "tag", ecoff_directive_tag, 0 },
147 { "val", ecoff_directive_val, 0 },
149 /* COFF debugging requires pseudo-ops .size and .type, but ELF
150 already has meanings for those. We use .esize and .etype
151 instead. These are only generated by gcc anyhow. */
152 { "esize", ecoff_directive_size, 0 },
153 { "etype", ecoff_directive_type, 0 },
155 /* ECOFF specific debugging information. */
156 { "begin", ecoff_directive_begin, 0 },
157 { "bend", ecoff_directive_bend, 0 },
158 { "end", ecoff_directive_end, 0 },
159 { "ent", ecoff_directive_ent, 0 },
160 { "fmask", ecoff_directive_fmask, 0 },
161 { "frame", ecoff_directive_frame, 0 },
162 { "loc", ecoff_directive_loc, 0 },
163 { "mask", ecoff_directive_mask, 0 },
165 /* Other ECOFF directives. */
166 { "extern", ecoff_directive_extern, 0 },
168 /* These are used on Irix. I don't know how to implement them. */
169 { "alias", s_ignore, 0 },
170 { "bgnb", s_ignore, 0 },
171 { "endb", s_ignore, 0 },
172 { "lab", s_ignore, 0 },
173 { "noalias", s_ignore, 0 },
174 { "verstamp", s_ignore, 0 },
175 { "vreg", s_ignore, 0 },
178 {NULL, NULL, 0} /* end sentinel */
182 #include "aout/aout64.h"
184 /* This is called when the assembler starts. */
186 asection *elf_com_section_ptr;
193 /* Add symbols for the known sections to the symbol table. */
194 s = bfd_get_section_by_name (stdoutput, TEXT_SECTION_NAME);
195 symbol_table_insert (section_symbol (s));
196 s = bfd_get_section_by_name (stdoutput, DATA_SECTION_NAME);
197 symbol_table_insert (section_symbol (s));
198 s = bfd_get_section_by_name (stdoutput, BSS_SECTION_NAME);
199 symbol_table_insert (section_symbol (s));
200 elf_com_section_ptr = bfd_com_section_ptr;
204 elf_pop_insert (void)
206 pop_insert (elf_pseudo_table);
208 pop_insert (ecoff_debug_pseudo_table);
212 elf_s_get_size (symbolS *sym)
214 return S_GET_SIZE (sym);
218 elf_s_set_size (symbolS *sym, bfd_vma sz)
220 S_SET_SIZE (sym, sz);
224 elf_s_get_align (symbolS *sym)
226 return S_GET_ALIGN (sym);
230 elf_s_set_align (symbolS *sym, bfd_vma align)
232 S_SET_ALIGN (sym, align);
236 elf_s_get_other (symbolS *sym)
238 return elf_symbol (symbol_get_bfdsym (sym))->internal_elf_sym.st_other;
242 elf_s_set_other (symbolS *sym, int other)
244 S_SET_OTHER (sym, other);
248 elf_sec_sym_ok_for_reloc (asection *sec)
250 return obj_sec_sym_ok_for_reloc (sec);
254 elf_file_symbol (const char *s, int appfile)
257 || symbol_rootP == NULL
258 || symbol_rootP->bsym == NULL
259 || (symbol_rootP->bsym->flags & BSF_FILE) == 0)
263 sym = symbol_new (s, absolute_section, 0, NULL);
264 symbol_set_frag (sym, &zero_address_frag);
265 symbol_get_bfdsym (sym)->flags |= BSF_FILE;
267 if (symbol_rootP != sym)
269 symbol_remove (sym, &symbol_rootP, &symbol_lastP);
270 symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP);
272 verify_symbol_chain (symbol_rootP, symbol_lastP);
277 #ifdef NEED_ECOFF_DEBUG
278 ecoff_new_file (s, appfile);
282 /* Called from read.c:s_comm after we've parsed .comm symbol, size.
283 Parse a possible alignment value. */
286 elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP, addressT size)
289 int is_local = symbol_get_obj (symbolP)->local;
291 if (*input_line_pointer == ',')
293 char *save = input_line_pointer;
295 input_line_pointer++;
298 if (*input_line_pointer == '"')
300 /* For sparc. Accept .common symbol, length, "bss" */
301 input_line_pointer++;
302 /* Some use the dot, some don't. */
303 if (*input_line_pointer == '.')
304 input_line_pointer++;
305 /* Some say data, some say bss. */
306 if (strncmp (input_line_pointer, "bss\"", 4) == 0)
307 input_line_pointer += 4;
308 else if (strncmp (input_line_pointer, "data\"", 5) == 0)
309 input_line_pointer += 5;
312 char *p = input_line_pointer;
317 while (!is_end_of_line[(unsigned char) *input_line_pointer])
318 if (*input_line_pointer++ == '"')
320 c = *input_line_pointer;
321 *input_line_pointer = '\0';
322 as_bad (_("bad .common segment %s"), p);
323 *input_line_pointer = c;
324 ignore_rest_of_line ();
327 /* ??? Don't ask me why these are always global. */
332 input_line_pointer = save;
333 align = parse_align (is_local);
334 if (align == (addressT) -1)
341 bss_alloc (symbolP, size, align);
342 S_CLEAR_EXTERNAL (symbolP);
346 S_SET_VALUE (symbolP, size);
347 S_SET_ALIGN (symbolP, align);
348 S_SET_EXTERNAL (symbolP);
349 S_SET_SEGMENT (symbolP, elf_com_section_ptr);
352 symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
358 obj_elf_common (int is_common)
360 if (flag_mri && is_common)
363 s_comm_internal (0, elf_common_parse);
367 obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED)
369 symbolS *symbolP = s_comm_internal (0, elf_common_parse);
372 symbol_get_bfdsym (symbolP)->flags |= BSF_THREAD_LOCAL;
376 obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED)
378 symbolS *symbolP = s_comm_internal (0, s_lcomm_internal);
381 symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
385 obj_elf_local (int ignore ATTRIBUTE_UNUSED)
393 name = input_line_pointer;
394 c = get_symbol_end ();
395 symbolP = symbol_find_or_make (name);
396 *input_line_pointer = c;
398 S_CLEAR_EXTERNAL (symbolP);
399 symbol_get_obj (symbolP)->local = 1;
402 input_line_pointer++;
404 if (*input_line_pointer == '\n')
409 demand_empty_rest_of_line ();
413 obj_elf_weak (int ignore ATTRIBUTE_UNUSED)
421 name = input_line_pointer;
422 c = get_symbol_end ();
423 symbolP = symbol_find_or_make (name);
424 *input_line_pointer = c;
426 S_SET_WEAK (symbolP);
427 symbol_get_obj (symbolP)->local = 1;
430 input_line_pointer++;
432 if (*input_line_pointer == '\n')
437 demand_empty_rest_of_line ();
441 obj_elf_visibility (int visibility)
447 elf_symbol_type *elfsym;
451 name = input_line_pointer;
452 c = get_symbol_end ();
453 symbolP = symbol_find_or_make (name);
454 *input_line_pointer = c;
458 bfdsym = symbol_get_bfdsym (symbolP);
459 elfsym = elf_symbol_from (bfd_asymbol_bfd (bfdsym), bfdsym);
463 elfsym->internal_elf_sym.st_other &= ~3;
464 elfsym->internal_elf_sym.st_other |= visibility;
468 input_line_pointer ++;
472 if (*input_line_pointer == '\n')
478 demand_empty_rest_of_line ();
481 static segT previous_section;
482 static int previous_subsection;
486 struct section_stack *next;
488 int subseg, prev_subseg;
491 static struct section_stack *section_stack;
494 get_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
496 const char *gname = inf;
497 const char *group_name = elf_group_name (sec);
499 return (group_name == gname
500 || (group_name != NULL
502 && strcmp (group_name, gname) == 0));
505 /* Handle the .section pseudo-op. This code supports two different
508 The first is found on Solaris, and looks like
509 .section ".sec1",#alloc,#execinstr,#write
510 Here the names after '#' are the SHF_* flags to turn on for the
511 section. I'm not sure how it determines the SHT_* type (BFD
512 doesn't really give us control over the type, anyhow).
514 The second format is found on UnixWare, and probably most SVR4
515 machines, and looks like
516 .section .sec1,"a",@progbits
517 The quoted string may contain any combination of a, w, x, and
518 represents the SHF_* flags to turn on for the section. The string
519 beginning with '@' can be progbits or nobits. There should be
520 other possibilities, but I don't know what they are. In any case,
521 BFD doesn't really let us set the section type. */
524 obj_elf_change_section (const char *name,
528 const char *group_name,
535 const struct elf_backend_data *bed;
536 const struct bfd_elf_special_section *ssect;
538 #ifdef md_flush_pending_output
539 md_flush_pending_output ();
542 /* Switch to the section, creating it if necessary. */
545 struct section_stack *elt;
546 elt = xmalloc (sizeof (struct section_stack));
547 elt->next = section_stack;
549 elt->prev_seg = previous_section;
550 elt->subseg = now_subseg;
551 elt->prev_subseg = previous_subsection;
554 previous_section = now_seg;
555 previous_subsection = now_subseg;
557 old_sec = bfd_get_section_by_name_if (stdoutput, name, get_section,
558 (void *) group_name);
565 sec = subseg_force_new (name, 0);
567 bed = get_elf_backend_data (stdoutput);
568 ssect = (*bed->get_sec_type_attr) (stdoutput, sec);
572 bfd_boolean override = FALSE;
574 if (type == SHT_NULL)
576 else if (type != ssect->type)
579 /* FIXME: gcc, as of 2002-10-22, will emit
581 .section .init_array,"aw",@progbits
583 for __attribute__ ((section (".init_array"))).
584 "@progbits" is incorrect. Also for x86-64 large bss
585 sections, gcc, as of 2005-07-06, will emit
587 .section .lbss,"aw",@progbits
589 "@progbits" is incorrect. */
591 && (bed->s->arch_size != 64
592 || !(ssect->attr & SHF_X86_64_LARGE))
594 && ssect->type != SHT_INIT_ARRAY
595 && ssect->type != SHT_FINI_ARRAY
596 && ssect->type != SHT_PREINIT_ARRAY)
598 /* We allow to specify any type for a .note section. */
599 if (ssect->type != SHT_NOTE)
600 as_warn (_("setting incorrect section type for %s"),
605 as_warn (_("ignoring incorrect section type for %s"),
611 if (old_sec == NULL && (attr & ~ssect->attr) != 0)
613 /* As a GNU extension, we permit a .note section to be
614 allocatable. If the linker sees an allocatable .note
615 section, it will create a PT_NOTE segment in the output
616 file. We also allow "x" for .note.GNU-stack. */
617 if (ssect->type == SHT_NOTE
618 && (attr == SHF_ALLOC || attr == SHF_EXECINSTR))
620 /* Allow different SHF_MERGE and SHF_STRINGS if we have
621 something like .rodata.str. */
622 else if (ssect->suffix_length == -2
623 && name[ssect->prefix_length] == '.'
627 & ~SHF_STRINGS) == 0)
629 /* .interp, .strtab and .symtab can have SHF_ALLOC. */
630 else if (attr == SHF_ALLOC
631 && (strcmp (name, ".interp") == 0
632 || strcmp (name, ".strtab") == 0
633 || strcmp (name, ".symtab") == 0))
635 /* .note.GNU-stack can have SHF_EXECINSTR. */
636 else if (attr == SHF_EXECINSTR
637 && strcmp (name, ".note.GNU-stack") == 0)
640 /* A section on Alpha may have SHF_ALPHA_GPREL. */
641 else if ((attr & ~ssect->attr) == SHF_ALPHA_GPREL)
646 if (group_name == NULL)
647 as_warn (_("setting incorrect section attributes for %s"),
652 if (!override && old_sec == NULL)
656 /* Convert ELF type and flags to BFD flags. */
658 | ((attr & SHF_WRITE) ? 0 : SEC_READONLY)
659 | ((attr & SHF_ALLOC) ? SEC_ALLOC : 0)
660 | (((attr & SHF_ALLOC) && type != SHT_NOBITS) ? SEC_LOAD : 0)
661 | ((attr & SHF_EXECINSTR) ? SEC_CODE : 0)
662 | ((attr & SHF_MERGE) ? SEC_MERGE : 0)
663 | ((attr & SHF_STRINGS) ? SEC_STRINGS : 0)
664 | ((attr & SHF_TLS) ? SEC_THREAD_LOCAL : 0));
665 #ifdef md_elf_section_flags
666 flags = md_elf_section_flags (flags, attr, type);
670 flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
676 elf_section_type (sec) = type;
677 elf_section_flags (sec) = attr;
679 /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */
680 if (type == SHT_NOBITS)
681 seg_info (sec)->bss = 1;
683 bfd_set_section_flags (stdoutput, sec, flags);
684 if (flags & SEC_MERGE)
685 sec->entsize = entsize;
686 elf_group_name (sec) = group_name;
688 /* Add a symbol for this section to the symbol table. */
689 secsym = symbol_find (name);
691 symbol_set_bfdsym (secsym, sec->symbol);
693 symbol_table_insert (section_symbol (sec));
698 && (unsigned) type != elf_section_type (old_sec))
699 as_warn (_("ignoring changed section type for %s"), name);
703 /* If section attributes are specified the second time we see a
704 particular section, then check that they are the same as we
705 saw the first time. */
706 if (((old_sec->flags ^ flags)
707 & (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
708 | SEC_EXCLUDE | SEC_SORT_ENTRIES | SEC_MERGE | SEC_STRINGS
709 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
710 | SEC_THREAD_LOCAL)))
711 as_warn (_("ignoring changed section attributes for %s"), name);
712 if ((flags & SEC_MERGE) && old_sec->entsize != (unsigned) entsize)
713 as_warn (_("ignoring changed section entity size for %s"), name);
717 #ifdef md_elf_section_change_hook
718 md_elf_section_change_hook ();
723 obj_elf_parse_section_letters (char *str, size_t len)
738 attr |= SHF_EXECINSTR;
754 if (*(str - 1) == 'a')
757 if (len > 1 && str[1] == 's')
766 char *bad_msg = _("unrecognized .section attribute: want a,w,x,M,S,G,T");
767 #ifdef md_elf_section_letter
768 int md_attr = md_elf_section_letter (*str, &bad_msg);
773 as_fatal ("%s", bad_msg);
784 obj_elf_section_word (char *str, size_t len)
786 if (len == 5 && strncmp (str, "write", 5) == 0)
788 if (len == 5 && strncmp (str, "alloc", 5) == 0)
790 if (len == 9 && strncmp (str, "execinstr", 9) == 0)
791 return SHF_EXECINSTR;
792 if (len == 3 && strncmp (str, "tls", 3) == 0)
795 #ifdef md_elf_section_word
797 int md_attr = md_elf_section_word (str, len);
803 as_warn (_("unrecognized section attribute"));
808 obj_elf_section_type (char *str, size_t len)
810 if (len == 8 && strncmp (str, "progbits", 8) == 0)
812 if (len == 6 && strncmp (str, "nobits", 6) == 0)
814 if (len == 4 && strncmp (str, "note", 4) == 0)
816 if (len == 10 && strncmp (str, "init_array", 10) == 0)
817 return SHT_INIT_ARRAY;
818 if (len == 10 && strncmp (str, "fini_array", 10) == 0)
819 return SHT_FINI_ARRAY;
820 if (len == 13 && strncmp (str, "preinit_array", 13) == 0)
821 return SHT_PREINIT_ARRAY;
823 #ifdef md_elf_section_type
825 int md_type = md_elf_section_type (str, len);
831 as_warn (_("unrecognized section type"));
835 /* Get name of section. */
837 obj_elf_section_name (void)
842 if (*input_line_pointer == '"')
846 name = demand_copy_C_string (&dummy);
849 ignore_rest_of_line ();
855 char *end = input_line_pointer;
857 while (0 == strchr ("\n\t,; ", *end))
859 if (end == input_line_pointer)
861 as_bad (_("missing name"));
862 ignore_rest_of_line ();
866 name = xmalloc (end - input_line_pointer + 1);
867 memcpy (name, input_line_pointer, end - input_line_pointer);
868 name[end - input_line_pointer] = '\0';
869 #ifdef tc_canonicalize_section_name
870 name = tc_canonicalize_section_name (name);
872 input_line_pointer = end;
879 obj_elf_section (int push)
881 char *name, *group_name, *beg;
882 int type, attr, dummy;
891 #ifdef md_flush_pending_output
892 md_flush_pending_output ();
895 previous_section = now_seg;
896 previous_subsection = now_subseg;
898 s_mri_sect (&mri_type);
900 #ifdef md_elf_section_change_hook
901 md_elf_section_change_hook ();
906 #endif /* ! defined (TC_I370) */
908 name = obj_elf_section_name ();
917 if (*input_line_pointer == ',')
919 /* Skip the comma. */
920 ++input_line_pointer;
923 if (*input_line_pointer == '"')
925 beg = demand_copy_C_string (&dummy);
928 ignore_rest_of_line ();
931 attr |= obj_elf_parse_section_letters (beg, strlen (beg));
934 if (*input_line_pointer == ',')
937 char *save = input_line_pointer;
939 ++input_line_pointer;
941 c = *input_line_pointer;
944 beg = demand_copy_C_string (&dummy);
947 ignore_rest_of_line ();
950 type = obj_elf_section_type (beg, strlen (beg));
952 else if (c == '@' || c == '%')
954 beg = ++input_line_pointer;
955 c = get_symbol_end ();
956 *input_line_pointer = c;
957 type = obj_elf_section_type (beg, input_line_pointer - beg);
960 input_line_pointer = save;
964 if ((attr & SHF_MERGE) != 0 && *input_line_pointer == ',')
966 ++input_line_pointer;
968 entsize = get_absolute_expression ();
972 as_warn (_("invalid merge entity size"));
977 else if ((attr & SHF_MERGE) != 0)
979 as_warn (_("entity size for SHF_MERGE not specified"));
983 if ((attr & SHF_GROUP) != 0 && *input_line_pointer == ',')
985 ++input_line_pointer;
986 group_name = obj_elf_section_name ();
987 if (group_name == NULL)
989 else if (strncmp (input_line_pointer, ",comdat", 7) == 0)
991 input_line_pointer += 7;
994 else if (strncmp (name, ".gnu.linkonce", 13) == 0)
997 else if ((attr & SHF_GROUP) != 0)
999 as_warn (_("group name for SHF_GROUP not specified"));
1010 if (*input_line_pointer != '#')
1012 as_bad (_("character following name is not '#'"));
1013 ignore_rest_of_line ();
1016 beg = ++input_line_pointer;
1017 c = get_symbol_end ();
1018 *input_line_pointer = c;
1020 attr |= obj_elf_section_word (beg, input_line_pointer - beg);
1024 while (*input_line_pointer++ == ',');
1025 --input_line_pointer;
1029 demand_empty_rest_of_line ();
1031 obj_elf_change_section (name, type, attr, entsize, group_name, linkonce, push);
1034 /* Change to the .data section. */
1037 obj_elf_data (int i)
1039 #ifdef md_flush_pending_output
1040 md_flush_pending_output ();
1043 previous_section = now_seg;
1044 previous_subsection = now_subseg;
1047 #ifdef md_elf_section_change_hook
1048 md_elf_section_change_hook ();
1052 /* Change to the .text section. */
1055 obj_elf_text (int i)
1057 #ifdef md_flush_pending_output
1058 md_flush_pending_output ();
1061 previous_section = now_seg;
1062 previous_subsection = now_subseg;
1065 #ifdef md_elf_section_change_hook
1066 md_elf_section_change_hook ();
1070 /* Change to the *ABS* section. */
1073 obj_elf_struct (int i)
1075 #ifdef md_flush_pending_output
1076 md_flush_pending_output ();
1079 previous_section = now_seg;
1080 previous_subsection = now_subseg;
1083 #ifdef md_elf_section_change_hook
1084 md_elf_section_change_hook ();
1089 obj_elf_subsection (int ignore ATTRIBUTE_UNUSED)
1093 #ifdef md_flush_pending_output
1094 md_flush_pending_output ();
1097 previous_section = now_seg;
1098 previous_subsection = now_subseg;
1100 temp = get_absolute_expression ();
1101 subseg_set (now_seg, (subsegT) temp);
1102 demand_empty_rest_of_line ();
1104 #ifdef md_elf_section_change_hook
1105 md_elf_section_change_hook ();
1109 /* This can be called from the processor backends if they change
1113 obj_elf_section_change_hook (void)
1115 previous_section = now_seg;
1116 previous_subsection = now_subseg;
1120 obj_elf_previous (int ignore ATTRIBUTE_UNUSED)
1125 if (previous_section == 0)
1127 as_warn (_(".previous without corresponding .section; ignored"));
1131 #ifdef md_flush_pending_output
1132 md_flush_pending_output ();
1135 new_section = previous_section;
1136 new_subsection = previous_subsection;
1137 previous_section = now_seg;
1138 previous_subsection = now_subseg;
1139 subseg_set (new_section, new_subsection);
1141 #ifdef md_elf_section_change_hook
1142 md_elf_section_change_hook ();
1147 obj_elf_popsection (int xxx ATTRIBUTE_UNUSED)
1149 struct section_stack *top = section_stack;
1153 as_warn (_(".popsection without corresponding .pushsection; ignored"));
1157 #ifdef md_flush_pending_output
1158 md_flush_pending_output ();
1161 section_stack = top->next;
1162 previous_section = top->prev_seg;
1163 previous_subsection = top->prev_subseg;
1164 subseg_set (top->seg, top->subseg);
1167 #ifdef md_elf_section_change_hook
1168 md_elf_section_change_hook ();
1173 obj_elf_line (int ignore ATTRIBUTE_UNUSED)
1175 /* Assume delimiter is part of expression. BSD4.2 as fails with
1176 delightful bug, so we are not being incompatible here. */
1177 new_logical_line (NULL, get_absolute_expression ());
1178 demand_empty_rest_of_line ();
1181 /* This handles the .symver pseudo-op, which is used to specify a
1182 symbol version. The syntax is ``.symver NAME,SYMVERNAME''.
1183 SYMVERNAME may contain ELF_VER_CHR ('@') characters. This
1184 pseudo-op causes the assembler to emit a symbol named SYMVERNAME
1185 with the same value as the symbol NAME. */
1188 obj_elf_symver (int ignore ATTRIBUTE_UNUSED)
1195 name = input_line_pointer;
1196 c = get_symbol_end ();
1198 sym = symbol_find_or_make (name);
1200 *input_line_pointer = c;
1203 if (*input_line_pointer != ',')
1205 as_bad (_("expected comma after name in .symver"));
1206 ignore_rest_of_line ();
1210 ++input_line_pointer;
1212 name = input_line_pointer;
1214 /* Temporarily include '@' in symbol names. */
1215 old_lexat = lex_type[(unsigned char) '@'];
1216 lex_type[(unsigned char) '@'] |= LEX_NAME;
1217 c = get_symbol_end ();
1218 lex_type[(unsigned char) '@'] = old_lexat;
1220 if (symbol_get_obj (sym)->versioned_name == NULL)
1222 symbol_get_obj (sym)->versioned_name = xstrdup (name);
1224 *input_line_pointer = c;
1226 if (strchr (symbol_get_obj (sym)->versioned_name,
1227 ELF_VER_CHR) == NULL)
1229 as_bad (_("missing version name in `%s' for symbol `%s'"),
1230 symbol_get_obj (sym)->versioned_name,
1232 ignore_rest_of_line ();
1238 if (strcmp (symbol_get_obj (sym)->versioned_name, name))
1240 as_bad (_("multiple versions [`%s'|`%s'] for symbol `%s'"),
1241 name, symbol_get_obj (sym)->versioned_name,
1243 ignore_rest_of_line ();
1247 *input_line_pointer = c;
1250 demand_empty_rest_of_line ();
1253 /* This handles the .vtable_inherit pseudo-op, which is used to indicate
1254 to the linker the hierarchy in which a particular table resides. The
1255 syntax is ".vtable_inherit CHILDNAME, PARENTNAME". */
1258 obj_elf_vtable_inherit (int ignore ATTRIBUTE_UNUSED)
1260 char *cname, *pname;
1261 symbolS *csym, *psym;
1264 if (*input_line_pointer == '#')
1265 ++input_line_pointer;
1267 cname = input_line_pointer;
1268 c = get_symbol_end ();
1269 csym = symbol_find (cname);
1271 /* GCFIXME: should check that we don't have two .vtable_inherits for
1272 the same child symbol. Also, we can currently only do this if the
1273 child symbol is already exists and is placed in a fragment. */
1275 if (csym == NULL || symbol_get_frag (csym) == NULL)
1277 as_bad ("expected `%s' to have already been set for .vtable_inherit",
1282 *input_line_pointer = c;
1285 if (*input_line_pointer != ',')
1287 as_bad ("expected comma after name in .vtable_inherit");
1288 ignore_rest_of_line ();
1292 ++input_line_pointer;
1295 if (*input_line_pointer == '#')
1296 ++input_line_pointer;
1298 if (input_line_pointer[0] == '0'
1299 && (input_line_pointer[1] == '\0'
1300 || ISSPACE (input_line_pointer[1])))
1302 psym = section_symbol (absolute_section);
1303 ++input_line_pointer;
1307 pname = input_line_pointer;
1308 c = get_symbol_end ();
1309 psym = symbol_find_or_make (pname);
1310 *input_line_pointer = c;
1313 demand_empty_rest_of_line ();
1318 assert (symbol_get_value_expression (csym)->X_op == O_constant);
1319 return fix_new (symbol_get_frag (csym),
1320 symbol_get_value_expression (csym)->X_add_number,
1321 0, psym, 0, 0, BFD_RELOC_VTABLE_INHERIT);
1324 /* This handles the .vtable_entry pseudo-op, which is used to indicate
1325 to the linker that a vtable slot was used. The syntax is
1326 ".vtable_entry tablename, offset". */
1329 obj_elf_vtable_entry (int ignore ATTRIBUTE_UNUSED)
1336 if (*input_line_pointer == '#')
1337 ++input_line_pointer;
1339 name = input_line_pointer;
1340 c = get_symbol_end ();
1341 sym = symbol_find_or_make (name);
1342 *input_line_pointer = c;
1345 if (*input_line_pointer != ',')
1347 as_bad ("expected comma after name in .vtable_entry");
1348 ignore_rest_of_line ();
1352 ++input_line_pointer;
1353 if (*input_line_pointer == '#')
1354 ++input_line_pointer;
1356 offset = get_absolute_expression ();
1358 demand_empty_rest_of_line ();
1360 return fix_new (frag_now, frag_now_fix (), 0, sym, offset, 0,
1361 BFD_RELOC_VTABLE_ENTRY);
1365 elf_obj_read_begin_hook (void)
1367 #ifdef NEED_ECOFF_DEBUG
1368 if (ECOFF_DEBUGGING)
1369 ecoff_read_begin_hook ();
1374 elf_obj_symbol_new_hook (symbolS *symbolP)
1376 struct elf_obj_sy *sy_obj;
1378 sy_obj = symbol_get_obj (symbolP);
1379 sy_obj->size = NULL;
1380 sy_obj->versioned_name = NULL;
1382 #ifdef NEED_ECOFF_DEBUG
1383 if (ECOFF_DEBUGGING)
1384 ecoff_symbol_new_hook (symbolP);
1388 /* When setting one symbol equal to another, by default we probably
1389 want them to have the same "size", whatever it means in the current
1393 elf_copy_symbol_attributes (symbolS *dest, symbolS *src)
1395 struct elf_obj_sy *srcelf = symbol_get_obj (src);
1396 struct elf_obj_sy *destelf = symbol_get_obj (dest);
1399 if (destelf->size == NULL)
1400 destelf->size = xmalloc (sizeof (expressionS));
1401 *destelf->size = *srcelf->size;
1405 if (destelf->size != NULL)
1406 free (destelf->size);
1407 destelf->size = NULL;
1409 S_SET_SIZE (dest, S_GET_SIZE (src));
1410 /* Don't copy visibility. */
1411 S_SET_OTHER (dest, (ELF_ST_VISIBILITY (S_GET_OTHER (dest))
1412 | (S_GET_OTHER (src) & ~ELF_ST_VISIBILITY (-1))));
1416 obj_elf_version (int ignore ATTRIBUTE_UNUSED)
1421 asection *seg = now_seg;
1422 subsegT subseg = now_subseg;
1423 Elf_Internal_Note i_note;
1424 Elf_External_Note e_note;
1425 asection *note_secp = NULL;
1428 if (*input_line_pointer == '\"')
1432 ++input_line_pointer; /* -> 1st char of string. */
1433 name = input_line_pointer;
1435 while (is_a_char (c = next_char_of_string ()))
1437 c = *input_line_pointer;
1438 *input_line_pointer = '\0';
1439 *(input_line_pointer - 1) = '\0';
1440 *input_line_pointer = c;
1442 /* Create the .note section. */
1443 note_secp = subseg_new (".note", 0);
1444 bfd_set_section_flags (stdoutput,
1446 SEC_HAS_CONTENTS | SEC_READONLY);
1448 /* Process the version string. */
1449 len = strlen (name) + 1;
1451 /* PR 3456: Although the name field is padded out to an 4-byte
1452 boundary, the namesz field should not be adjusted. */
1453 i_note.namesz = len;
1454 i_note.descsz = 0; /* No description. */
1455 i_note.type = NT_VERSION;
1456 p = frag_more (sizeof (e_note.namesz));
1457 md_number_to_chars (p, i_note.namesz, sizeof (e_note.namesz));
1458 p = frag_more (sizeof (e_note.descsz));
1459 md_number_to_chars (p, i_note.descsz, sizeof (e_note.descsz));
1460 p = frag_more (sizeof (e_note.type));
1461 md_number_to_chars (p, i_note.type, sizeof (e_note.type));
1462 p = frag_more (len);
1463 memcpy (p, name, len);
1465 frag_align (2, 0, 0);
1467 subseg_set (seg, subseg);
1470 as_bad (_("expected quoted string"));
1472 demand_empty_rest_of_line ();
1476 obj_elf_size (int ignore ATTRIBUTE_UNUSED)
1478 char *name = input_line_pointer;
1479 char c = get_symbol_end ();
1484 p = input_line_pointer;
1487 if (*input_line_pointer != ',')
1490 as_bad (_("expected comma after name `%s' in .size directive"), name);
1492 ignore_rest_of_line ();
1495 input_line_pointer++;
1497 if (exp.X_op == O_absent)
1499 as_bad (_("missing expression in .size directive"));
1500 exp.X_op = O_constant;
1501 exp.X_add_number = 0;
1504 sym = symbol_find_or_make (name);
1506 if (exp.X_op == O_constant)
1508 S_SET_SIZE (sym, exp.X_add_number);
1509 if (symbol_get_obj (sym)->size)
1511 xfree (symbol_get_obj (sym)->size);
1512 symbol_get_obj (sym)->size = NULL;
1517 symbol_get_obj (sym)->size = xmalloc (sizeof (expressionS));
1518 *symbol_get_obj (sym)->size = exp;
1520 demand_empty_rest_of_line ();
1523 /* Handle the ELF .type pseudo-op. This sets the type of a symbol.
1524 There are five syntaxes:
1526 The first (used on Solaris) is
1528 The second (used on UnixWare) is
1530 The third (reportedly to be used on Irix 6.0) is
1532 The fourth (used on NetBSD/Arm and Linux/ARM) is
1534 The fifth (used on SVR4/860) is
1535 .type SYM,"function"
1539 obj_elf_type (int ignore ATTRIBUTE_UNUSED)
1544 const char *typename;
1546 elf_symbol_type *elfsym;
1548 name = input_line_pointer;
1549 c = get_symbol_end ();
1550 sym = symbol_find_or_make (name);
1551 elfsym = (elf_symbol_type *) symbol_get_bfdsym (sym);
1552 *input_line_pointer = c;
1555 if (*input_line_pointer == ',')
1556 ++input_line_pointer;
1559 if ( *input_line_pointer == '#'
1560 || *input_line_pointer == '@'
1561 || *input_line_pointer == '"'
1562 || *input_line_pointer == '%')
1563 ++input_line_pointer;
1565 typename = input_line_pointer;
1566 c = get_symbol_end ();
1569 if (strcmp (typename, "function") == 0
1570 || strcmp (typename, "STT_FUNC") == 0)
1571 type = BSF_FUNCTION;
1572 else if (strcmp (typename, "object") == 0
1573 || strcmp (typename, "STT_OBJECT") == 0)
1575 else if (strcmp (typename, "tls_object") == 0
1576 || strcmp (typename, "STT_TLS") == 0)
1577 type = BSF_OBJECT | BSF_THREAD_LOCAL;
1578 else if (strcmp (typename, "notype") == 0
1579 || strcmp (typename, "STT_NOTYPE") == 0)
1581 #ifdef md_elf_symbol_type
1582 else if ((type = md_elf_symbol_type (typename, sym, elfsym)) != -1)
1586 as_bad (_("unrecognized symbol type \"%s\""), typename);
1588 *input_line_pointer = c;
1590 if (*input_line_pointer == '"')
1591 ++input_line_pointer;
1593 elfsym->symbol.flags |= type;
1595 demand_empty_rest_of_line ();
1599 obj_elf_ident (int ignore ATTRIBUTE_UNUSED)
1601 static segT comment_section;
1602 segT old_section = now_seg;
1603 int old_subsection = now_subseg;
1605 #ifdef md_flush_pending_output
1606 md_flush_pending_output ();
1609 if (!comment_section)
1612 comment_section = subseg_new (".comment", 0);
1613 bfd_set_section_flags (stdoutput, comment_section,
1614 SEC_READONLY | SEC_HAS_CONTENTS);
1619 subseg_set (comment_section, 0);
1621 subseg_set (old_section, old_subsection);
1624 #ifdef INIT_STAB_SECTION
1626 /* The first entry in a .stabs section is special. */
1629 obj_elf_init_stab_section (segT seg)
1634 unsigned int stroff;
1636 /* Force the section to align to a longword boundary. Without this,
1637 UnixWare ar crashes. */
1638 bfd_set_section_alignment (stdoutput, seg, 2);
1640 /* Make space for this first symbol. */
1644 as_where (&file, NULL);
1645 stabstr_name = xmalloc (strlen (segment_name (seg)) + 4);
1646 strcpy (stabstr_name, segment_name (seg));
1647 strcat (stabstr_name, "str");
1648 stroff = get_stab_string_offset (file, stabstr_name);
1650 md_number_to_chars (p, stroff, 4);
1651 seg_info (seg)->stabu.p = p;
1656 /* Fill in the counts in the first entry in a .stabs section. */
1659 adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1666 if (strncmp (".stab", sec->name, 5))
1668 if (!strcmp ("str", sec->name + strlen (sec->name) - 3))
1671 name = alloca (strlen (sec->name) + 4);
1672 strcpy (name, sec->name);
1673 strcat (name, "str");
1674 strsec = bfd_get_section_by_name (abfd, name);
1676 strsz = bfd_section_size (abfd, strsec);
1679 nsyms = bfd_section_size (abfd, sec) / 12 - 1;
1681 p = seg_info (sec)->stabu.p;
1684 bfd_h_put_16 (abfd, nsyms, p + 6);
1685 bfd_h_put_32 (abfd, strsz, p + 8);
1688 #ifdef NEED_ECOFF_DEBUG
1690 /* This function is called by the ECOFF code. It is supposed to
1691 record the external symbol information so that the backend can
1692 write it out correctly. The ELF backend doesn't actually handle
1693 this at the moment, so we do it ourselves. We save the information
1697 elf_ecoff_set_ext (symbolS *sym, struct ecoff_extr *ext)
1699 symbol_get_bfdsym (sym)->udata.p = ext;
1702 /* This function is called by bfd_ecoff_debug_externals. It is
1703 supposed to *EXT to the external symbol information, and return
1704 whether the symbol should be used at all. */
1707 elf_get_extr (asymbol *sym, EXTR *ext)
1709 if (sym->udata.p == NULL)
1711 *ext = *(EXTR *) sym->udata.p;
1715 /* This function is called by bfd_ecoff_debug_externals. It has
1716 nothing to do for ELF. */
1719 elf_set_index (asymbol *sym ATTRIBUTE_UNUSED,
1720 bfd_size_type indx ATTRIBUTE_UNUSED)
1724 #endif /* NEED_ECOFF_DEBUG */
1727 elf_frob_symbol (symbolS *symp, int *puntp)
1729 struct elf_obj_sy *sy_obj;
1731 #ifdef NEED_ECOFF_DEBUG
1732 if (ECOFF_DEBUGGING)
1733 ecoff_frob_symbol (symp);
1736 sy_obj = symbol_get_obj (symp);
1738 if (sy_obj->size != NULL)
1740 switch (sy_obj->size->X_op)
1744 (S_GET_VALUE (sy_obj->size->X_add_symbol)
1745 + sy_obj->size->X_add_number
1746 - S_GET_VALUE (sy_obj->size->X_op_symbol)));
1750 (S_GET_VALUE (sy_obj->size->X_add_symbol)
1751 + sy_obj->size->X_add_number));
1754 as_bad (_(".size expression too complicated to fix up"));
1757 free (sy_obj->size);
1758 sy_obj->size = NULL;
1761 if (sy_obj->versioned_name != NULL)
1765 p = strchr (sy_obj->versioned_name, ELF_VER_CHR);
1768 /* This symbol was given a new name with the .symver directive.
1770 If this is an external reference, just rename the symbol to
1771 include the version string. This will make the relocs be
1772 against the correct versioned symbol.
1774 If this is a definition, add an alias. FIXME: Using an alias
1775 will permit the debugging information to refer to the right
1776 symbol. However, it's not clear whether it is the best
1779 if (! S_IS_DEFINED (symp))
1781 /* Verify that the name isn't using the @@ syntax--this is
1782 reserved for definitions of the default version to link
1784 if (p[1] == ELF_VER_CHR)
1786 as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"),
1787 sy_obj->versioned_name);
1790 S_SET_NAME (symp, sy_obj->versioned_name);
1794 if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR)
1798 /* The @@@ syntax is a special case. It renames the
1799 symbol name to versioned_name with one `@' removed. */
1800 l = strlen (&p[3]) + 1;
1801 memmove (&p[2], &p[3], l);
1802 S_SET_NAME (symp, sy_obj->versioned_name);
1808 /* FIXME: Creating a new symbol here is risky. We're
1809 in the final loop over the symbol table. We can
1810 get away with it only because the symbol goes to
1811 the end of the list, where the loop will still see
1812 it. It would probably be better to do this in
1813 obj_frob_file_before_adjust. */
1815 symp2 = symbol_find_or_make (sy_obj->versioned_name);
1817 /* Now we act as though we saw symp2 = sym. */
1819 S_SET_SEGMENT (symp2, S_GET_SEGMENT (symp));
1821 /* Subtracting out the frag address here is a hack
1822 because we are in the middle of the final loop. */
1825 - symbol_get_frag (symp)->fr_address));
1827 symbol_set_frag (symp2, symbol_get_frag (symp));
1829 /* This will copy over the size information. */
1830 copy_symbol_attributes (symp2, symp);
1832 S_SET_OTHER (symp2, S_GET_OTHER (symp));
1834 if (S_IS_WEAK (symp))
1837 if (S_IS_EXTERNAL (symp))
1838 S_SET_EXTERNAL (symp2);
1843 /* Double check weak symbols. */
1844 if (S_IS_WEAK (symp))
1846 if (S_IS_COMMON (symp))
1847 as_bad (_("symbol `%s' can not be both weak and common"),
1852 /* The Irix 5 and 6 assemblers set the type of any common symbol and
1853 any undefined non-function symbol to STT_OBJECT. We try to be
1854 compatible, since newer Irix 5 and 6 linkers care. However, we
1855 only set undefined symbols to be STT_OBJECT if we are on Irix,
1856 because that is the only time gcc will generate the necessary
1857 .global directives to mark functions. */
1859 if (S_IS_COMMON (symp))
1860 symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;
1862 if (strstr (TARGET_OS, "irix") != NULL
1863 && ! S_IS_DEFINED (symp)
1864 && (symbol_get_bfdsym (symp)->flags & BSF_FUNCTION) == 0)
1865 symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;
1871 asection **head; /* Section lists. */
1872 unsigned int *elt_count; /* Number of sections in each list. */
1873 unsigned int num_group; /* Number of lists. */
1876 /* Called via bfd_map_over_sections. If SEC is a member of a group,
1877 add it to a list of sections belonging to the group. INF is a
1878 pointer to a struct group_list, which is where we store the head of
1882 build_group_lists (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
1884 struct group_list *list = inf;
1885 const char *group_name = elf_group_name (sec);
1888 if (group_name == NULL)
1891 /* If this group already has a list, add the section to the head of
1893 for (i = 0; i < list->num_group; i++)
1895 if (strcmp (group_name, elf_group_name (list->head[i])) == 0)
1897 elf_next_in_group (sec) = list->head[i];
1898 list->head[i] = sec;
1899 list->elt_count[i] += 1;
1904 /* New group. Make the arrays bigger in chunks to minimize calls to
1906 i = list->num_group;
1909 unsigned int newsize = i + 128;
1910 list->head = xrealloc (list->head, newsize * sizeof (*list->head));
1911 list->elt_count = xrealloc (list->elt_count,
1912 newsize * sizeof (*list->elt_count));
1914 list->head[i] = sec;
1915 list->elt_count[i] = 1;
1916 list->num_group += 1;
1920 elf_frob_file (void)
1922 struct group_list list;
1925 bfd_map_over_sections (stdoutput, adjust_stab_sections, NULL);
1927 /* Go find section groups. */
1930 list.elt_count = NULL;
1931 bfd_map_over_sections (stdoutput, build_group_lists, &list);
1933 /* Make the SHT_GROUP sections that describe each section group. We
1934 can't set up the section contents here yet, because elf section
1935 indices have yet to be calculated. elf.c:set_group_contents does
1936 the rest of the work. */
1937 for (i = 0; i < list.num_group; i++)
1939 const char *group_name = elf_group_name (list.head[i]);
1940 const char *sec_name;
1947 flags = SEC_READONLY | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_GROUP;
1948 for (s = list.head[i]; s != NULL; s = elf_next_in_group (s))
1949 if ((s->flags ^ flags) & SEC_LINK_ONCE)
1951 flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
1952 if (s != list.head[i])
1954 as_warn (_("assuming all members of group `%s' are COMDAT"),
1960 sec_name = group_name;
1961 sy = symbol_find_exact (group_name);
1964 && (sy == symbol_lastP
1965 || (sy->sy_next != NULL
1966 && sy->sy_next->sy_previous == sy)))
1969 sec_name = ".group";
1971 s = subseg_force_new (sec_name, 0);
1973 || !bfd_set_section_flags (stdoutput, s, flags)
1974 || !bfd_set_section_alignment (stdoutput, s, 2))
1976 as_fatal (_("can't create group: %s"),
1977 bfd_errmsg (bfd_get_error ()));
1979 elf_section_type (s) = SHT_GROUP;
1981 /* Pass a pointer to the first section in this group. */
1982 elf_next_in_group (s) = list.head[i];
1984 elf_group_id (s) = sy->bsym;
1986 size = 4 * (list.elt_count[i] + 1);
1987 bfd_set_section_size (stdoutput, s, size);
1988 s->contents = (unsigned char *) frag_more (size);
1989 frag_now->fr_fix = frag_now_fix_octets ();
1990 frag_wane (frag_now);
1993 #ifdef elf_tc_final_processing
1994 elf_tc_final_processing ();
1998 /* It removes any unneeded versioned symbols from the symbol table. */
2001 elf_frob_file_before_adjust (void)
2007 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
2008 if (!S_IS_DEFINED (symp))
2010 if (symbol_get_obj (symp)->versioned_name)
2014 /* The @@@ syntax is a special case. If the symbol is
2015 not defined, 2 `@'s will be removed from the
2018 p = strchr (symbol_get_obj (symp)->versioned_name,
2021 if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR)
2023 size_t l = strlen (&p[3]) + 1;
2024 memmove (&p[1], &p[3], l);
2026 if (symbol_used_p (symp) == 0
2027 && symbol_used_in_reloc_p (symp) == 0)
2028 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2031 /* If there was .weak foo, but foo was neither defined nor
2032 used anywhere, remove it. */
2034 else if (S_IS_WEAK (symp)
2035 && symbol_used_p (symp) == 0
2036 && symbol_used_in_reloc_p (symp) == 0)
2037 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2042 /* It is required that we let write_relocs have the opportunity to
2043 optimize away fixups before output has begun, since it is possible
2044 to eliminate all fixups for a section and thus we never should
2045 have generated the relocation section. */
2048 elf_frob_file_after_relocs (void)
2050 #ifdef NEED_ECOFF_DEBUG
2051 if (ECOFF_DEBUGGING)
2052 /* Generate the ECOFF debugging information. */
2054 const struct ecoff_debug_swap *debug_swap;
2055 struct ecoff_debug_info debug;
2060 = get_elf_backend_data (stdoutput)->elf_backend_ecoff_debug_swap;
2061 know (debug_swap != NULL);
2062 ecoff_build_debug (&debug.symbolic_header, &buf, debug_swap);
2064 /* Set up the pointers in debug. */
2065 #define SET(ptr, offset, type) \
2066 debug.ptr = (type) (buf + debug.symbolic_header.offset)
2068 SET (line, cbLineOffset, unsigned char *);
2069 SET (external_dnr, cbDnOffset, void *);
2070 SET (external_pdr, cbPdOffset, void *);
2071 SET (external_sym, cbSymOffset, void *);
2072 SET (external_opt, cbOptOffset, void *);
2073 SET (external_aux, cbAuxOffset, union aux_ext *);
2074 SET (ss, cbSsOffset, char *);
2075 SET (external_fdr, cbFdOffset, void *);
2076 SET (external_rfd, cbRfdOffset, void *);
2077 /* ssext and external_ext are set up just below. */
2081 /* Set up the external symbols. */
2082 debug.ssext = debug.ssext_end = NULL;
2083 debug.external_ext = debug.external_ext_end = NULL;
2084 if (! bfd_ecoff_debug_externals (stdoutput, &debug, debug_swap, TRUE,
2085 elf_get_extr, elf_set_index))
2086 as_fatal (_("failed to set up debugging information: %s"),
2087 bfd_errmsg (bfd_get_error ()));
2089 sec = bfd_get_section_by_name (stdoutput, ".mdebug");
2090 assert (sec != NULL);
2092 know (!stdoutput->output_has_begun);
2094 /* We set the size of the section, call bfd_set_section_contents
2095 to force the ELF backend to allocate a file position, and then
2096 write out the data. FIXME: Is this really the best way to do
2098 bfd_set_section_size
2099 (stdoutput, sec, bfd_ecoff_debug_size (stdoutput, &debug, debug_swap));
2101 /* Pass BUF to bfd_set_section_contents because this will
2102 eventually become a call to fwrite, and ISO C prohibits
2103 passing a NULL pointer to a stdio function even if the
2104 pointer will not be used. */
2105 if (! bfd_set_section_contents (stdoutput, sec, buf, 0, 0))
2106 as_fatal (_("can't start writing .mdebug section: %s"),
2107 bfd_errmsg (bfd_get_error ()));
2109 know (stdoutput->output_has_begun);
2110 know (sec->filepos != 0);
2112 if (! bfd_ecoff_write_debug (stdoutput, &debug, debug_swap,
2114 as_fatal (_("could not write .mdebug section: %s"),
2115 bfd_errmsg (bfd_get_error ()));
2117 #endif /* NEED_ECOFF_DEBUG */
2122 /* Heavily plagiarized from obj_elf_version. The idea is to emit the
2123 SCO specific identifier in the .notes section to satisfy the SCO
2126 This looks more complicated than it really is. As opposed to the
2127 "obvious" solution, this should handle the cross dev cases
2128 correctly. (i.e, hosting on a 64 bit big endian processor, but
2129 generating SCO Elf code) Efficiency isn't a concern, as there
2130 should be exactly one of these sections per object module.
2132 SCO OpenServer 5 identifies it's ELF modules with a standard ELF
2135 int_32 namesz = 4 ; Name size
2136 int_32 descsz = 12 ; Descriptive information
2138 char name[4] = "SCO" ; Originator name ALWAYS SCO + NULL
2139 int_32 version = (major ver # << 16) | version of tools ;
2140 int_32 source = (tool_id << 16 ) | 1 ;
2141 int_32 info = 0 ; These are set by the SCO tools, but we
2142 don't know enough about the source
2143 environment to set them. SCO ld currently
2144 ignores them, and recommends we set them
2147 #define SCO_MAJOR_VERSION 0x1
2148 #define SCO_MINOR_VERSION 0x1
2158 asection *seg = now_seg;
2159 subsegT subseg = now_subseg;
2160 Elf_Internal_Note i_note;
2161 Elf_External_Note e_note;
2162 asection *note_secp = NULL;
2165 /* create the .note section */
2167 note_secp = subseg_new (".note", 0);
2168 bfd_set_section_flags (stdoutput,
2170 SEC_HAS_CONTENTS | SEC_READONLY);
2172 /* process the version string */
2175 i_note.descsz = 12; /* 12 descriptive bytes */
2176 i_note.type = NT_VERSION; /* Contains a version string */
2178 p = frag_more (sizeof (i_note.namesz));
2179 md_number_to_chars (p, i_note.namesz, 4);
2181 p = frag_more (sizeof (i_note.descsz));
2182 md_number_to_chars (p, i_note.descsz, 4);
2184 p = frag_more (sizeof (i_note.type));
2185 md_number_to_chars (p, i_note.type, 4);
2190 /* Note: this is the version number of the ELF we're representing */
2192 md_number_to_chars (p, (SCO_MAJOR_VERSION << 16) | (SCO_MINOR_VERSION), 4);
2194 /* Here, we pick a magic number for ourselves (yes, I "registered"
2195 it with SCO. The bottom bit shows that we are compat with the
2198 md_number_to_chars (p, 0x4c520000 | 0x0001, 4);
2200 /* If we knew (or cared) what the source language options were, we'd
2201 fill them in here. SCO has given us permission to ignore these
2202 and just set them to zero. */
2204 md_number_to_chars (p, 0x0000, 4);
2206 frag_align (2, 0, 0);
2208 /* We probably can't restore the current segment, for there likely
2211 subseg_set (seg, subseg);
2215 #endif /* SCO_ELF */
2218 elf_separate_stab_sections (void)
2220 #ifdef NEED_ECOFF_DEBUG
2221 return (!ECOFF_DEBUGGING);
2228 elf_init_stab_section (segT seg)
2230 #ifdef NEED_ECOFF_DEBUG
2231 if (!ECOFF_DEBUGGING)
2233 obj_elf_init_stab_section (seg);
2236 const struct format_ops elf_format_ops =
2238 bfd_target_elf_flavour,
2239 0, /* dfl_leading_underscore */
2240 1, /* emit_section_symbols */
2245 elf_frob_file_before_adjust,
2246 0, /* obj_frob_file_before_fix */
2247 elf_frob_file_after_relocs,
2248 elf_s_get_size, elf_s_set_size,
2249 elf_s_get_align, elf_s_set_align,
2256 elf_copy_symbol_attributes,
2257 #ifdef NEED_ECOFF_DEBUG
2258 ecoff_generate_asm_lineno,
2261 0, /* generate_asm_lineno */
2262 0, /* process_stab */
2264 elf_separate_stab_sections,
2265 elf_init_stab_section,
2266 elf_sec_sym_ok_for_reloc,
2268 #ifdef NEED_ECOFF_DEBUG
2271 0, /* ecoff_set_ext */
2273 elf_obj_read_begin_hook,
2274 elf_obj_symbol_new_hook