1 /* ELF object file format
2 Copyright (C) 1992-2014 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3,
9 or (at your option) any later version.
11 GAS is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 #define OBJ_HEADER "obj-elf.h"
23 #include "safe-ctype.h"
26 #include "struc-symbol.h"
27 #include "dwarf2dbg.h"
29 #ifndef ECOFF_DEBUGGING
30 #define ECOFF_DEBUGGING 0
32 #define NEED_ECOFF_DEBUG
35 #ifdef NEED_ECOFF_DEBUG
40 #include "elf/alpha.h"
56 #include "elf/x86-64.h"
64 #include "elf/nios2.h"
67 static void obj_elf_line (int);
68 static void obj_elf_size (int);
69 static void obj_elf_type (int);
70 static void obj_elf_ident (int);
71 static void obj_elf_weak (int);
72 static void obj_elf_local (int);
73 static void obj_elf_visibility (int);
74 static void obj_elf_symver (int);
75 static void obj_elf_subsection (int);
76 static void obj_elf_popsection (int);
77 static void obj_elf_gnu_attribute (int);
78 static void obj_elf_tls_common (int);
79 static void obj_elf_lcomm (int);
80 static void obj_elf_struct (int);
82 static const pseudo_typeS elf_pseudo_table
[] =
84 {"comm", obj_elf_common
, 0},
85 {"common", obj_elf_common
, 1},
86 {"ident", obj_elf_ident
, 0},
87 {"lcomm", obj_elf_lcomm
, 0},
88 {"local", obj_elf_local
, 0},
89 {"previous", obj_elf_previous
, 0},
90 {"section", obj_elf_section
, 0},
91 {"section.s", obj_elf_section
, 0},
92 {"sect", obj_elf_section
, 0},
93 {"sect.s", obj_elf_section
, 0},
94 {"pushsection", obj_elf_section
, 1},
95 {"popsection", obj_elf_popsection
, 0},
96 {"size", obj_elf_size
, 0},
97 {"type", obj_elf_type
, 0},
98 {"version", obj_elf_version
, 0},
99 {"weak", obj_elf_weak
, 0},
101 /* These define symbol visibility. */
102 {"internal", obj_elf_visibility
, STV_INTERNAL
},
103 {"hidden", obj_elf_visibility
, STV_HIDDEN
},
104 {"protected", obj_elf_visibility
, STV_PROTECTED
},
106 /* These are used for stabs-in-elf configurations. */
107 {"line", obj_elf_line
, 0},
109 /* This is a GNU extension to handle symbol versions. */
110 {"symver", obj_elf_symver
, 0},
112 /* A GNU extension to change subsection only. */
113 {"subsection", obj_elf_subsection
, 0},
115 /* These are GNU extensions to aid in garbage collecting C++ vtables. */
116 {"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit
, 0},
117 {"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry
, 0},
119 /* A GNU extension for object attributes. */
120 {"gnu_attribute", obj_elf_gnu_attribute
, 0},
122 /* These are used for dwarf. */
126 /* These are used for dwarf2. */
127 { "file", (void (*) (int)) dwarf2_directive_file
, 0 },
128 { "loc", dwarf2_directive_loc
, 0 },
129 { "loc_mark_labels", dwarf2_directive_loc_mark_labels
, 0 },
131 /* We need to trap the section changing calls to handle .previous. */
132 {"data", obj_elf_data
, 0},
133 {"offset", obj_elf_struct
, 0},
134 {"struct", obj_elf_struct
, 0},
135 {"text", obj_elf_text
, 0},
137 {"tls_common", obj_elf_tls_common
, 0},
143 static const pseudo_typeS ecoff_debug_pseudo_table
[] =
145 #ifdef NEED_ECOFF_DEBUG
146 /* COFF style debugging information for ECOFF. .ln is not used; .loc
148 { "def", ecoff_directive_def
, 0 },
149 { "dim", ecoff_directive_dim
, 0 },
150 { "endef", ecoff_directive_endef
, 0 },
151 { "file", ecoff_directive_file
, 0 },
152 { "scl", ecoff_directive_scl
, 0 },
153 { "tag", ecoff_directive_tag
, 0 },
154 { "val", ecoff_directive_val
, 0 },
156 /* COFF debugging requires pseudo-ops .size and .type, but ELF
157 already has meanings for those. We use .esize and .etype
158 instead. These are only generated by gcc anyhow. */
159 { "esize", ecoff_directive_size
, 0 },
160 { "etype", ecoff_directive_type
, 0 },
162 /* ECOFF specific debugging information. */
163 { "begin", ecoff_directive_begin
, 0 },
164 { "bend", ecoff_directive_bend
, 0 },
165 { "end", ecoff_directive_end
, 0 },
166 { "ent", ecoff_directive_ent
, 0 },
167 { "fmask", ecoff_directive_fmask
, 0 },
168 { "frame", ecoff_directive_frame
, 0 },
169 { "loc", ecoff_directive_loc
, 0 },
170 { "mask", ecoff_directive_mask
, 0 },
172 /* Other ECOFF directives. */
173 { "extern", ecoff_directive_extern
, 0 },
175 /* These are used on Irix. I don't know how to implement them. */
176 { "alias", s_ignore
, 0 },
177 { "bgnb", s_ignore
, 0 },
178 { "endb", s_ignore
, 0 },
179 { "lab", s_ignore
, 0 },
180 { "noalias", s_ignore
, 0 },
181 { "verstamp", s_ignore
, 0 },
182 { "vreg", s_ignore
, 0 },
185 {NULL
, NULL
, 0} /* end sentinel */
189 #include "aout/aout64.h"
191 /* This is called when the assembler starts. */
193 asection
*elf_com_section_ptr
;
200 /* Add symbols for the known sections to the symbol table. */
201 s
= bfd_get_section_by_name (stdoutput
, TEXT_SECTION_NAME
);
202 symbol_table_insert (section_symbol (s
));
203 s
= bfd_get_section_by_name (stdoutput
, DATA_SECTION_NAME
);
204 symbol_table_insert (section_symbol (s
));
205 s
= bfd_get_section_by_name (stdoutput
, BSS_SECTION_NAME
);
206 symbol_table_insert (section_symbol (s
));
207 elf_com_section_ptr
= bfd_com_section_ptr
;
211 elf_pop_insert (void)
213 pop_insert (elf_pseudo_table
);
215 pop_insert (ecoff_debug_pseudo_table
);
219 elf_s_get_size (symbolS
*sym
)
221 return S_GET_SIZE (sym
);
225 elf_s_set_size (symbolS
*sym
, bfd_vma sz
)
227 S_SET_SIZE (sym
, sz
);
231 elf_s_get_align (symbolS
*sym
)
233 return S_GET_ALIGN (sym
);
237 elf_s_set_align (symbolS
*sym
, bfd_vma align
)
239 S_SET_ALIGN (sym
, align
);
243 elf_s_get_other (symbolS
*sym
)
245 return elf_symbol (symbol_get_bfdsym (sym
))->internal_elf_sym
.st_other
;
249 elf_s_set_other (symbolS
*sym
, int other
)
251 S_SET_OTHER (sym
, other
);
255 elf_sec_sym_ok_for_reloc (asection
*sec
)
257 return obj_sec_sym_ok_for_reloc (sec
);
261 elf_file_symbol (const char *s
, int appfile
)
264 || symbol_rootP
== NULL
265 || symbol_rootP
->bsym
== NULL
266 || (symbol_rootP
->bsym
->flags
& BSF_FILE
) == 0)
269 unsigned int name_length
;
271 sym
= symbol_new (s
, absolute_section
, 0, NULL
);
272 symbol_set_frag (sym
, &zero_address_frag
);
274 name_length
= strlen (s
);
275 if (name_length
> strlen (S_GET_NAME (sym
)))
277 obstack_grow (¬es
, s
, name_length
+ 1);
278 S_SET_NAME (sym
, (const char *) obstack_finish (¬es
));
281 strcpy ((char *) S_GET_NAME (sym
), s
);
283 symbol_get_bfdsym (sym
)->flags
|= BSF_FILE
;
285 if (symbol_rootP
!= sym
)
287 symbol_remove (sym
, &symbol_rootP
, &symbol_lastP
);
288 symbol_insert (sym
, symbol_rootP
, &symbol_rootP
, &symbol_lastP
);
290 verify_symbol_chain (symbol_rootP
, symbol_lastP
);
295 #ifdef NEED_ECOFF_DEBUG
296 ecoff_new_file (s
, appfile
);
300 /* Called from read.c:s_comm after we've parsed .comm symbol, size.
301 Parse a possible alignment value. */
304 elf_common_parse (int ignore ATTRIBUTE_UNUSED
, symbolS
*symbolP
, addressT size
)
307 int is_local
= symbol_get_obj (symbolP
)->local
;
309 if (*input_line_pointer
== ',')
311 char *save
= input_line_pointer
;
313 input_line_pointer
++;
316 if (*input_line_pointer
== '"')
318 /* For sparc. Accept .common symbol, length, "bss" */
319 input_line_pointer
++;
320 /* Some use the dot, some don't. */
321 if (*input_line_pointer
== '.')
322 input_line_pointer
++;
323 /* Some say data, some say bss. */
324 if (strncmp (input_line_pointer
, "bss\"", 4) == 0)
325 input_line_pointer
+= 4;
326 else if (strncmp (input_line_pointer
, "data\"", 5) == 0)
327 input_line_pointer
+= 5;
330 char *p
= input_line_pointer
;
335 while (!is_end_of_line
[(unsigned char) *input_line_pointer
])
336 if (*input_line_pointer
++ == '"')
338 c
= *input_line_pointer
;
339 *input_line_pointer
= '\0';
340 as_bad (_("bad .common segment %s"), p
);
341 *input_line_pointer
= c
;
342 ignore_rest_of_line ();
345 /* ??? Don't ask me why these are always global. */
350 input_line_pointer
= save
;
351 align
= parse_align (is_local
);
352 if (align
== (addressT
) -1)
359 bss_alloc (symbolP
, size
, align
);
360 S_CLEAR_EXTERNAL (symbolP
);
364 S_SET_VALUE (symbolP
, size
);
365 S_SET_ALIGN (symbolP
, align
);
366 S_SET_EXTERNAL (symbolP
);
367 S_SET_SEGMENT (symbolP
, elf_com_section_ptr
);
370 symbol_get_bfdsym (symbolP
)->flags
|= BSF_OBJECT
;
376 obj_elf_common (int is_common
)
378 if (flag_mri
&& is_common
)
381 s_comm_internal (0, elf_common_parse
);
385 obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED
)
387 symbolS
*symbolP
= s_comm_internal (0, elf_common_parse
);
390 symbol_get_bfdsym (symbolP
)->flags
|= BSF_THREAD_LOCAL
;
394 obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED
)
396 symbolS
*symbolP
= s_comm_internal (0, s_lcomm_internal
);
399 symbol_get_bfdsym (symbolP
)->flags
|= BSF_OBJECT
;
403 get_sym_from_input_line_and_check (void)
409 name
= input_line_pointer
;
410 c
= get_symbol_end ();
411 sym
= symbol_find_or_make (name
);
412 *input_line_pointer
= c
;
415 /* There is no symbol name if input_line_pointer has not moved. */
416 if (name
== input_line_pointer
)
417 as_bad (_("Missing symbol name in directive"));
422 obj_elf_local (int ignore ATTRIBUTE_UNUSED
)
429 symbolP
= get_sym_from_input_line_and_check ();
430 c
= *input_line_pointer
;
431 S_CLEAR_EXTERNAL (symbolP
);
432 symbol_get_obj (symbolP
)->local
= 1;
435 input_line_pointer
++;
437 if (*input_line_pointer
== '\n')
442 demand_empty_rest_of_line ();
446 obj_elf_weak (int ignore ATTRIBUTE_UNUSED
)
453 symbolP
= get_sym_from_input_line_and_check ();
454 c
= *input_line_pointer
;
455 S_SET_WEAK (symbolP
);
458 input_line_pointer
++;
460 if (*input_line_pointer
== '\n')
465 demand_empty_rest_of_line ();
469 obj_elf_visibility (int visibility
)
474 elf_symbol_type
*elfsym
;
478 symbolP
= get_sym_from_input_line_and_check ();
480 bfdsym
= symbol_get_bfdsym (symbolP
);
481 elfsym
= elf_symbol_from (bfd_asymbol_bfd (bfdsym
), bfdsym
);
485 elfsym
->internal_elf_sym
.st_other
&= ~3;
486 elfsym
->internal_elf_sym
.st_other
|= visibility
;
488 c
= *input_line_pointer
;
491 input_line_pointer
++;
495 if (*input_line_pointer
== '\n')
501 demand_empty_rest_of_line ();
504 static segT previous_section
;
505 static int previous_subsection
;
509 struct section_stack
*next
;
511 int subseg
, prev_subseg
;
514 static struct section_stack
*section_stack
;
517 get_section (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
519 const char *gname
= (const char *) inf
;
520 const char *group_name
= elf_group_name (sec
);
522 return (group_name
== gname
523 || (group_name
!= NULL
525 && strcmp (group_name
, gname
) == 0));
528 /* Handle the .section pseudo-op. This code supports two different
531 The first is found on Solaris, and looks like
532 .section ".sec1",#alloc,#execinstr,#write
533 Here the names after '#' are the SHF_* flags to turn on for the
534 section. I'm not sure how it determines the SHT_* type (BFD
535 doesn't really give us control over the type, anyhow).
537 The second format is found on UnixWare, and probably most SVR4
538 machines, and looks like
539 .section .sec1,"a",@progbits
540 The quoted string may contain any combination of a, w, x, and
541 represents the SHF_* flags to turn on for the section. The string
542 beginning with '@' can be progbits or nobits. There should be
543 other possibilities, but I don't know what they are. In any case,
544 BFD doesn't really let us set the section type. */
547 obj_elf_change_section (const char *name
,
551 const char *group_name
,
558 const struct elf_backend_data
*bed
;
559 const struct bfd_elf_special_section
*ssect
;
561 #ifdef md_flush_pending_output
562 md_flush_pending_output ();
565 /* Switch to the section, creating it if necessary. */
568 struct section_stack
*elt
;
569 elt
= (struct section_stack
*) xmalloc (sizeof (struct section_stack
));
570 elt
->next
= section_stack
;
572 elt
->prev_seg
= previous_section
;
573 elt
->subseg
= now_subseg
;
574 elt
->prev_subseg
= previous_subsection
;
577 previous_section
= now_seg
;
578 previous_subsection
= now_subseg
;
580 old_sec
= bfd_get_section_by_name_if (stdoutput
, name
, get_section
,
581 (void *) group_name
);
588 sec
= subseg_force_new (name
, 0);
590 bed
= get_elf_backend_data (stdoutput
);
591 ssect
= (*bed
->get_sec_type_attr
) (stdoutput
, sec
);
595 bfd_boolean override
= FALSE
;
597 if (type
== SHT_NULL
)
599 else if (type
!= ssect
->type
)
602 /* Some older versions of gcc will emit
604 .section .init_array,"aw",@progbits
606 for __attribute__ ((section (".init_array"))).
607 "@progbits" is incorrect. Also for x86-64 large bss
608 sections, some older versions of gcc will emit
610 .section .lbss,"aw",@progbits
612 "@progbits" is incorrect. */
614 && (bed
->s
->arch_size
!= 64
615 || !(ssect
->attr
& SHF_X86_64_LARGE
))
617 && ssect
->type
!= SHT_INIT_ARRAY
618 && ssect
->type
!= SHT_FINI_ARRAY
619 && ssect
->type
!= SHT_PREINIT_ARRAY
)
621 /* We allow to specify any type for a .note section. */
622 if (ssect
->type
!= SHT_NOTE
)
623 as_warn (_("setting incorrect section type for %s"),
628 as_warn (_("ignoring incorrect section type for %s"),
634 if (old_sec
== NULL
&& (attr
& ~ssect
->attr
) != 0)
636 /* As a GNU extension, we permit a .note section to be
637 allocatable. If the linker sees an allocatable .note
638 section, it will create a PT_NOTE segment in the output
639 file. We also allow "x" for .note.GNU-stack. */
640 if (ssect
->type
== SHT_NOTE
641 && (attr
== SHF_ALLOC
|| attr
== SHF_EXECINSTR
))
643 /* Allow different SHF_MERGE and SHF_STRINGS if we have
644 something like .rodata.str. */
645 else if (ssect
->suffix_length
== -2
646 && name
[ssect
->prefix_length
] == '.'
650 & ~SHF_STRINGS
) == 0)
652 /* .interp, .strtab and .symtab can have SHF_ALLOC. */
653 else if (attr
== SHF_ALLOC
654 && (strcmp (name
, ".interp") == 0
655 || strcmp (name
, ".strtab") == 0
656 || strcmp (name
, ".symtab") == 0))
658 /* .note.GNU-stack can have SHF_EXECINSTR. */
659 else if (attr
== SHF_EXECINSTR
660 && strcmp (name
, ".note.GNU-stack") == 0)
663 /* A section on Alpha may have SHF_ALPHA_GPREL. */
664 else if ((attr
& ~ssect
->attr
) == SHF_ALPHA_GPREL
)
668 else if (attr
== (SHF_EXECINSTR
| SHF_WRITE
| SHF_ALLOC
)
669 && (ssect
->type
== SHT_INIT_ARRAY
670 || ssect
->type
== SHT_FINI_ARRAY
671 || ssect
->type
== SHT_PREINIT_ARRAY
))
672 /* RX init/fini arrays can and should have the "awx" attributes set. */
677 if (group_name
== NULL
)
678 as_warn (_("setting incorrect section attributes for %s"),
683 if (!override
&& old_sec
== NULL
)
687 /* Convert ELF type and flags to BFD flags. */
689 | ((attr
& SHF_WRITE
) ? 0 : SEC_READONLY
)
690 | ((attr
& SHF_ALLOC
) ? SEC_ALLOC
: 0)
691 | (((attr
& SHF_ALLOC
) && type
!= SHT_NOBITS
) ? SEC_LOAD
: 0)
692 | ((attr
& SHF_EXECINSTR
) ? SEC_CODE
: 0)
693 | ((attr
& SHF_MERGE
) ? SEC_MERGE
: 0)
694 | ((attr
& SHF_STRINGS
) ? SEC_STRINGS
: 0)
695 | ((attr
& SHF_EXCLUDE
) ? SEC_EXCLUDE
: 0)
696 | ((attr
& SHF_TLS
) ? SEC_THREAD_LOCAL
: 0));
697 #ifdef md_elf_section_flags
698 flags
= md_elf_section_flags (flags
, attr
, type
);
702 flags
|= SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_DISCARD
;
708 if (type
== SHT_NULL
)
709 type
= bfd_elf_get_default_section_type (flags
);
710 elf_section_type (sec
) = type
;
711 elf_section_flags (sec
) = attr
;
713 /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */
714 if (type
== SHT_NOBITS
)
715 seg_info (sec
)->bss
= 1;
717 bfd_set_section_flags (stdoutput
, sec
, flags
);
718 if (flags
& SEC_MERGE
)
719 sec
->entsize
= entsize
;
720 elf_group_name (sec
) = group_name
;
722 /* Add a symbol for this section to the symbol table. */
723 secsym
= symbol_find (name
);
725 symbol_set_bfdsym (secsym
, sec
->symbol
);
727 symbol_table_insert (section_symbol (sec
));
732 && (unsigned) type
!= elf_section_type (old_sec
))
733 as_warn (_("ignoring changed section type for %s"), name
);
737 /* If section attributes are specified the second time we see a
738 particular section, then check that they are the same as we
739 saw the first time. */
740 if (((old_sec
->flags
^ flags
)
741 & (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_CODE
742 | SEC_EXCLUDE
| SEC_SORT_ENTRIES
| SEC_MERGE
| SEC_STRINGS
743 | SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_DISCARD
744 | SEC_THREAD_LOCAL
)))
745 as_warn (_("ignoring changed section attributes for %s"), name
);
746 if ((flags
& SEC_MERGE
) && old_sec
->entsize
!= (unsigned) entsize
)
747 as_warn (_("ignoring changed section entity size for %s"), name
);
751 #ifdef md_elf_section_change_hook
752 md_elf_section_change_hook ();
757 obj_elf_parse_section_letters (char *str
, size_t len
, bfd_boolean
*is_clone
)
776 attr
|= SHF_EXECINSTR
;
795 if (*(str
- 1) == 'a')
798 if (len
> 1 && str
[1] == 's')
807 char *bad_msg
= _("unrecognized .section attribute: want a,e,w,x,M,S,G,T");
808 #ifdef md_elf_section_letter
809 bfd_vma md_attr
= md_elf_section_letter (*str
, &bad_msg
);
810 if (md_attr
!= (bfd_vma
) -1)
814 as_fatal ("%s", bad_msg
);
825 obj_elf_section_type (char *str
, size_t len
, bfd_boolean warn
)
827 if (len
== 8 && strncmp (str
, "progbits", 8) == 0)
829 if (len
== 6 && strncmp (str
, "nobits", 6) == 0)
831 if (len
== 4 && strncmp (str
, "note", 4) == 0)
833 if (len
== 10 && strncmp (str
, "init_array", 10) == 0)
834 return SHT_INIT_ARRAY
;
835 if (len
== 10 && strncmp (str
, "fini_array", 10) == 0)
836 return SHT_FINI_ARRAY
;
837 if (len
== 13 && strncmp (str
, "preinit_array", 13) == 0)
838 return SHT_PREINIT_ARRAY
;
840 #ifdef md_elf_section_type
842 int md_type
= md_elf_section_type (str
, len
);
849 as_warn (_("unrecognized section type"));
854 obj_elf_section_word (char *str
, size_t len
, int *type
)
858 if (len
== 5 && strncmp (str
, "write", 5) == 0)
860 if (len
== 5 && strncmp (str
, "alloc", 5) == 0)
862 if (len
== 9 && strncmp (str
, "execinstr", 9) == 0)
863 return SHF_EXECINSTR
;
864 if (len
== 7 && strncmp (str
, "exclude", 7) == 0)
866 if (len
== 3 && strncmp (str
, "tls", 3) == 0)
869 #ifdef md_elf_section_word
871 bfd_vma md_attr
= md_elf_section_word (str
, len
);
877 ret
= obj_elf_section_type (str
, len
, FALSE
);
881 as_warn (_("unrecognized section attribute"));
886 /* Get name of section. */
888 obj_elf_section_name (void)
893 if (*input_line_pointer
== '"')
897 name
= demand_copy_C_string (&dummy
);
900 ignore_rest_of_line ();
906 char *end
= input_line_pointer
;
908 while (0 == strchr ("\n\t,; ", *end
))
910 if (end
== input_line_pointer
)
912 as_bad (_("missing name"));
913 ignore_rest_of_line ();
917 name
= (char *) xmalloc (end
- input_line_pointer
+ 1);
918 memcpy (name
, input_line_pointer
, end
- input_line_pointer
);
919 name
[end
- input_line_pointer
] = '\0';
920 #ifdef tc_canonicalize_section_name
921 name
= tc_canonicalize_section_name (name
);
923 input_line_pointer
= end
;
930 obj_elf_section (int push
)
932 char *name
, *group_name
, *beg
;
937 subsegT new_subsection
= -1;
944 #ifdef md_flush_pending_output
945 md_flush_pending_output ();
948 previous_section
= now_seg
;
949 previous_subsection
= now_subseg
;
951 s_mri_sect (&mri_type
);
953 #ifdef md_elf_section_change_hook
954 md_elf_section_change_hook ();
959 #endif /* ! defined (TC_I370) */
961 name
= obj_elf_section_name ();
970 if (*input_line_pointer
== ',')
972 /* Skip the comma. */
973 ++input_line_pointer
;
976 if (push
&& ISDIGIT (*input_line_pointer
))
978 /* .pushsection has an optional subsection. */
979 new_subsection
= (subsegT
) get_absolute_expression ();
983 /* Stop if we don't see a comma. */
984 if (*input_line_pointer
!= ',')
987 /* Skip the comma. */
988 ++input_line_pointer
;
992 if (*input_line_pointer
== '"')
994 bfd_boolean is_clone
;
996 beg
= demand_copy_C_string (&dummy
);
999 ignore_rest_of_line ();
1002 attr
|= obj_elf_parse_section_letters (beg
, strlen (beg
), &is_clone
);
1005 if (*input_line_pointer
== ',')
1008 char *save
= input_line_pointer
;
1010 ++input_line_pointer
;
1012 c
= *input_line_pointer
;
1015 beg
= demand_copy_C_string (&dummy
);
1018 ignore_rest_of_line ();
1021 type
= obj_elf_section_type (beg
, strlen (beg
), TRUE
);
1023 else if (c
== '@' || c
== '%')
1025 beg
= ++input_line_pointer
;
1026 c
= get_symbol_end ();
1027 *input_line_pointer
= c
;
1028 type
= obj_elf_section_type (beg
, input_line_pointer
- beg
, TRUE
);
1031 input_line_pointer
= save
;
1035 if ((attr
& SHF_MERGE
) != 0 && *input_line_pointer
== ',')
1037 ++input_line_pointer
;
1039 entsize
= get_absolute_expression ();
1043 as_warn (_("invalid merge entity size"));
1048 else if ((attr
& SHF_MERGE
) != 0)
1050 as_warn (_("entity size for SHF_MERGE not specified"));
1054 if ((attr
& SHF_GROUP
) != 0 && is_clone
)
1056 as_warn (_("? section flag ignored with G present"));
1059 if ((attr
& SHF_GROUP
) != 0 && *input_line_pointer
== ',')
1061 ++input_line_pointer
;
1062 group_name
= obj_elf_section_name ();
1063 if (group_name
== NULL
)
1065 else if (*input_line_pointer
== ',')
1067 ++input_line_pointer
;
1069 if (strncmp (input_line_pointer
, "comdat", 6) == 0)
1071 input_line_pointer
+= 6;
1075 else if (strncmp (name
, ".gnu.linkonce", 13) == 0)
1078 else if ((attr
& SHF_GROUP
) != 0)
1080 as_warn (_("group name for SHF_GROUP not specified"));
1086 const char *now_group
= elf_group_name (now_seg
);
1087 if (now_group
!= NULL
)
1089 group_name
= xstrdup (now_group
);
1090 linkonce
= (now_seg
->flags
& SEC_LINK_ONCE
) != 0;
1101 if (*input_line_pointer
!= '#')
1103 as_bad (_("character following name is not '#'"));
1104 ignore_rest_of_line ();
1107 beg
= ++input_line_pointer
;
1108 c
= get_symbol_end ();
1109 *input_line_pointer
= c
;
1111 attr
|= obj_elf_section_word (beg
, input_line_pointer
- beg
, & type
);
1115 while (*input_line_pointer
++ == ',');
1116 --input_line_pointer
;
1121 demand_empty_rest_of_line ();
1123 obj_elf_change_section (name
, type
, attr
, entsize
, group_name
, linkonce
, push
);
1125 if (push
&& new_subsection
!= -1)
1126 subseg_set (now_seg
, new_subsection
);
1129 /* Change to the .data section. */
1132 obj_elf_data (int i
)
1134 #ifdef md_flush_pending_output
1135 md_flush_pending_output ();
1138 previous_section
= now_seg
;
1139 previous_subsection
= now_subseg
;
1142 #ifdef md_elf_section_change_hook
1143 md_elf_section_change_hook ();
1147 /* Change to the .text section. */
1150 obj_elf_text (int i
)
1152 #ifdef md_flush_pending_output
1153 md_flush_pending_output ();
1156 previous_section
= now_seg
;
1157 previous_subsection
= now_subseg
;
1160 #ifdef md_elf_section_change_hook
1161 md_elf_section_change_hook ();
1165 /* Change to the *ABS* section. */
1168 obj_elf_struct (int i
)
1170 #ifdef md_flush_pending_output
1171 md_flush_pending_output ();
1174 previous_section
= now_seg
;
1175 previous_subsection
= now_subseg
;
1178 #ifdef md_elf_section_change_hook
1179 md_elf_section_change_hook ();
1184 obj_elf_subsection (int ignore ATTRIBUTE_UNUSED
)
1188 #ifdef md_flush_pending_output
1189 md_flush_pending_output ();
1192 previous_section
= now_seg
;
1193 previous_subsection
= now_subseg
;
1195 temp
= get_absolute_expression ();
1196 subseg_set (now_seg
, (subsegT
) temp
);
1197 demand_empty_rest_of_line ();
1199 #ifdef md_elf_section_change_hook
1200 md_elf_section_change_hook ();
1204 /* This can be called from the processor backends if they change
1208 obj_elf_section_change_hook (void)
1210 previous_section
= now_seg
;
1211 previous_subsection
= now_subseg
;
1215 obj_elf_previous (int ignore ATTRIBUTE_UNUSED
)
1220 if (previous_section
== 0)
1222 as_warn (_(".previous without corresponding .section; ignored"));
1226 #ifdef md_flush_pending_output
1227 md_flush_pending_output ();
1230 new_section
= previous_section
;
1231 new_subsection
= previous_subsection
;
1232 previous_section
= now_seg
;
1233 previous_subsection
= now_subseg
;
1234 subseg_set (new_section
, new_subsection
);
1236 #ifdef md_elf_section_change_hook
1237 md_elf_section_change_hook ();
1242 obj_elf_popsection (int xxx ATTRIBUTE_UNUSED
)
1244 struct section_stack
*top
= section_stack
;
1248 as_warn (_(".popsection without corresponding .pushsection; ignored"));
1252 #ifdef md_flush_pending_output
1253 md_flush_pending_output ();
1256 section_stack
= top
->next
;
1257 previous_section
= top
->prev_seg
;
1258 previous_subsection
= top
->prev_subseg
;
1259 subseg_set (top
->seg
, top
->subseg
);
1262 #ifdef md_elf_section_change_hook
1263 md_elf_section_change_hook ();
1268 obj_elf_line (int ignore ATTRIBUTE_UNUSED
)
1270 /* Assume delimiter is part of expression. BSD4.2 as fails with
1271 delightful bug, so we are not being incompatible here. */
1272 new_logical_line (NULL
, get_absolute_expression ());
1273 demand_empty_rest_of_line ();
1276 /* This handles the .symver pseudo-op, which is used to specify a
1277 symbol version. The syntax is ``.symver NAME,SYMVERNAME''.
1278 SYMVERNAME may contain ELF_VER_CHR ('@') characters. This
1279 pseudo-op causes the assembler to emit a symbol named SYMVERNAME
1280 with the same value as the symbol NAME. */
1283 obj_elf_symver (int ignore ATTRIBUTE_UNUSED
)
1290 sym
= get_sym_from_input_line_and_check ();
1292 if (*input_line_pointer
!= ',')
1294 as_bad (_("expected comma after name in .symver"));
1295 ignore_rest_of_line ();
1299 ++input_line_pointer
;
1301 name
= input_line_pointer
;
1303 /* Temporarily include '@' in symbol names. */
1304 old_lexat
= lex_type
[(unsigned char) '@'];
1305 lex_type
[(unsigned char) '@'] |= LEX_NAME
;
1306 c
= get_symbol_end ();
1307 lex_type
[(unsigned char) '@'] = old_lexat
;
1309 if (symbol_get_obj (sym
)->versioned_name
== NULL
)
1311 symbol_get_obj (sym
)->versioned_name
= xstrdup (name
);
1313 *input_line_pointer
= c
;
1315 if (strchr (symbol_get_obj (sym
)->versioned_name
,
1316 ELF_VER_CHR
) == NULL
)
1318 as_bad (_("missing version name in `%s' for symbol `%s'"),
1319 symbol_get_obj (sym
)->versioned_name
,
1321 ignore_rest_of_line ();
1327 if (strcmp (symbol_get_obj (sym
)->versioned_name
, name
))
1329 as_bad (_("multiple versions [`%s'|`%s'] for symbol `%s'"),
1330 name
, symbol_get_obj (sym
)->versioned_name
,
1332 ignore_rest_of_line ();
1336 *input_line_pointer
= c
;
1339 demand_empty_rest_of_line ();
1342 /* This handles the .vtable_inherit pseudo-op, which is used to indicate
1343 to the linker the hierarchy in which a particular table resides. The
1344 syntax is ".vtable_inherit CHILDNAME, PARENTNAME". */
1347 obj_elf_vtable_inherit (int ignore ATTRIBUTE_UNUSED
)
1349 char *cname
, *pname
;
1350 symbolS
*csym
, *psym
;
1353 if (*input_line_pointer
== '#')
1354 ++input_line_pointer
;
1356 cname
= input_line_pointer
;
1357 c
= get_symbol_end ();
1358 csym
= symbol_find (cname
);
1360 /* GCFIXME: should check that we don't have two .vtable_inherits for
1361 the same child symbol. Also, we can currently only do this if the
1362 child symbol is already exists and is placed in a fragment. */
1364 if (csym
== NULL
|| symbol_get_frag (csym
) == NULL
)
1366 as_bad (_("expected `%s' to have already been set for .vtable_inherit"),
1371 *input_line_pointer
= c
;
1374 if (*input_line_pointer
!= ',')
1376 as_bad (_("expected comma after name in .vtable_inherit"));
1377 ignore_rest_of_line ();
1381 ++input_line_pointer
;
1384 if (*input_line_pointer
== '#')
1385 ++input_line_pointer
;
1387 if (input_line_pointer
[0] == '0'
1388 && (input_line_pointer
[1] == '\0'
1389 || ISSPACE (input_line_pointer
[1])))
1391 psym
= section_symbol (absolute_section
);
1392 ++input_line_pointer
;
1396 pname
= input_line_pointer
;
1397 c
= get_symbol_end ();
1398 psym
= symbol_find_or_make (pname
);
1399 *input_line_pointer
= c
;
1402 demand_empty_rest_of_line ();
1407 gas_assert (symbol_get_value_expression (csym
)->X_op
== O_constant
);
1408 return fix_new (symbol_get_frag (csym
),
1409 symbol_get_value_expression (csym
)->X_add_number
,
1410 0, psym
, 0, 0, BFD_RELOC_VTABLE_INHERIT
);
1413 /* This handles the .vtable_entry pseudo-op, which is used to indicate
1414 to the linker that a vtable slot was used. The syntax is
1415 ".vtable_entry tablename, offset". */
1418 obj_elf_vtable_entry (int ignore ATTRIBUTE_UNUSED
)
1423 if (*input_line_pointer
== '#')
1424 ++input_line_pointer
;
1426 sym
= get_sym_from_input_line_and_check ();
1427 if (*input_line_pointer
!= ',')
1429 as_bad (_("expected comma after name in .vtable_entry"));
1430 ignore_rest_of_line ();
1434 ++input_line_pointer
;
1435 if (*input_line_pointer
== '#')
1436 ++input_line_pointer
;
1438 offset
= get_absolute_expression ();
1440 demand_empty_rest_of_line ();
1442 return fix_new (frag_now
, frag_now_fix (), 0, sym
, offset
, 0,
1443 BFD_RELOC_VTABLE_ENTRY
);
1446 #define skip_whitespace(str) do { if (*(str) == ' ') ++(str); } while (0)
1449 skip_past_char (char ** str
, char c
)
1459 #define skip_past_comma(str) skip_past_char (str, ',')
1461 /* Parse an attribute directive for VENDOR.
1462 Returns the attribute number read, or zero on error. */
1465 obj_elf_vendor_attribute (int vendor
)
1473 /* Read the first number or name. */
1474 skip_whitespace (input_line_pointer
);
1475 s
= input_line_pointer
;
1476 if (ISDIGIT (*input_line_pointer
))
1479 if (exp
.X_op
!= O_constant
)
1481 tag
= exp
.X_add_number
;
1487 /* A name may contain '_', but no other punctuation. */
1488 for (; ISALNUM (*input_line_pointer
) || *input_line_pointer
== '_';
1489 ++input_line_pointer
)
1494 name
= (char *) alloca (i
+ 1);
1495 memcpy (name
, s
, i
);
1498 #ifndef CONVERT_SYMBOLIC_ATTRIBUTE
1499 #define CONVERT_SYMBOLIC_ATTRIBUTE(a) -1
1502 tag
= CONVERT_SYMBOLIC_ATTRIBUTE (name
);
1505 as_bad (_("Attribute name not recognised: %s"), name
);
1506 ignore_rest_of_line ();
1511 type
= _bfd_elf_obj_attrs_arg_type (stdoutput
, vendor
, tag
);
1513 if (skip_past_comma (&input_line_pointer
) == -1)
1518 if (exp
.X_op
!= O_constant
)
1520 as_bad (_("expected numeric constant"));
1521 ignore_rest_of_line ();
1524 i
= exp
.X_add_number
;
1527 && skip_past_comma (&input_line_pointer
) == -1)
1529 as_bad (_("expected comma"));
1530 ignore_rest_of_line ();
1537 skip_whitespace (input_line_pointer
);
1538 if (*input_line_pointer
!= '"')
1540 s
= demand_copy_C_string (&len
);
1546 bfd_elf_add_obj_attr_int_string (stdoutput
, vendor
, tag
, i
, s
);
1549 bfd_elf_add_obj_attr_string (stdoutput
, vendor
, tag
, s
);
1552 bfd_elf_add_obj_attr_int (stdoutput
, vendor
, tag
, i
);
1558 demand_empty_rest_of_line ();
1561 as_bad (_("bad string constant"));
1562 ignore_rest_of_line ();
1565 as_bad (_("expected <tag> , <value>"));
1566 ignore_rest_of_line ();
1570 /* Parse a .gnu_attribute directive. */
1573 obj_elf_gnu_attribute (int ignored ATTRIBUTE_UNUSED
)
1575 obj_elf_vendor_attribute (OBJ_ATTR_GNU
);
1579 elf_obj_read_begin_hook (void)
1581 #ifdef NEED_ECOFF_DEBUG
1582 if (ECOFF_DEBUGGING
)
1583 ecoff_read_begin_hook ();
1588 elf_obj_symbol_new_hook (symbolS
*symbolP
)
1590 struct elf_obj_sy
*sy_obj
;
1592 sy_obj
= symbol_get_obj (symbolP
);
1593 sy_obj
->size
= NULL
;
1594 sy_obj
->versioned_name
= NULL
;
1596 #ifdef NEED_ECOFF_DEBUG
1597 if (ECOFF_DEBUGGING
)
1598 ecoff_symbol_new_hook (symbolP
);
1602 /* When setting one symbol equal to another, by default we probably
1603 want them to have the same "size", whatever it means in the current
1607 elf_copy_symbol_attributes (symbolS
*dest
, symbolS
*src
)
1609 struct elf_obj_sy
*srcelf
= symbol_get_obj (src
);
1610 struct elf_obj_sy
*destelf
= symbol_get_obj (dest
);
1613 if (destelf
->size
== NULL
)
1614 destelf
->size
= (expressionS
*) xmalloc (sizeof (expressionS
));
1615 *destelf
->size
= *srcelf
->size
;
1619 if (destelf
->size
!= NULL
)
1620 free (destelf
->size
);
1621 destelf
->size
= NULL
;
1623 S_SET_SIZE (dest
, S_GET_SIZE (src
));
1624 /* Don't copy visibility. */
1625 S_SET_OTHER (dest
, (ELF_ST_VISIBILITY (S_GET_OTHER (dest
))
1626 | (S_GET_OTHER (src
) & ~ELF_ST_VISIBILITY (-1))));
1630 obj_elf_version (int ignore ATTRIBUTE_UNUSED
)
1635 asection
*seg
= now_seg
;
1636 subsegT subseg
= now_subseg
;
1637 Elf_Internal_Note i_note
;
1638 Elf_External_Note e_note
;
1639 asection
*note_secp
= NULL
;
1642 if (*input_line_pointer
== '\"')
1646 ++input_line_pointer
; /* -> 1st char of string. */
1647 name
= input_line_pointer
;
1649 while (is_a_char (c
= next_char_of_string ()))
1651 c
= *input_line_pointer
;
1652 *input_line_pointer
= '\0';
1653 *(input_line_pointer
- 1) = '\0';
1654 *input_line_pointer
= c
;
1656 /* Create the .note section. */
1657 note_secp
= subseg_new (".note", 0);
1658 bfd_set_section_flags (stdoutput
,
1660 SEC_HAS_CONTENTS
| SEC_READONLY
);
1662 /* Process the version string. */
1663 len
= strlen (name
) + 1;
1665 /* PR 3456: Although the name field is padded out to an 4-byte
1666 boundary, the namesz field should not be adjusted. */
1667 i_note
.namesz
= len
;
1668 i_note
.descsz
= 0; /* No description. */
1669 i_note
.type
= NT_VERSION
;
1670 p
= frag_more (sizeof (e_note
.namesz
));
1671 md_number_to_chars (p
, i_note
.namesz
, sizeof (e_note
.namesz
));
1672 p
= frag_more (sizeof (e_note
.descsz
));
1673 md_number_to_chars (p
, i_note
.descsz
, sizeof (e_note
.descsz
));
1674 p
= frag_more (sizeof (e_note
.type
));
1675 md_number_to_chars (p
, i_note
.type
, sizeof (e_note
.type
));
1676 p
= frag_more (len
);
1677 memcpy (p
, name
, len
);
1679 frag_align (2, 0, 0);
1681 subseg_set (seg
, subseg
);
1684 as_bad (_("expected quoted string"));
1686 demand_empty_rest_of_line ();
1690 obj_elf_size (int ignore ATTRIBUTE_UNUSED
)
1692 char *name
= input_line_pointer
;
1693 char c
= get_symbol_end ();
1698 p
= input_line_pointer
;
1701 if (*input_line_pointer
!= ',')
1704 as_bad (_("expected comma after name `%s' in .size directive"), name
);
1706 ignore_rest_of_line ();
1709 input_line_pointer
++;
1711 if (exp
.X_op
== O_absent
)
1713 as_bad (_("missing expression in .size directive"));
1714 exp
.X_op
= O_constant
;
1715 exp
.X_add_number
= 0;
1718 sym
= symbol_find_or_make (name
);
1720 if (exp
.X_op
== O_constant
)
1722 S_SET_SIZE (sym
, exp
.X_add_number
);
1723 if (symbol_get_obj (sym
)->size
)
1725 xfree (symbol_get_obj (sym
)->size
);
1726 symbol_get_obj (sym
)->size
= NULL
;
1731 symbol_get_obj (sym
)->size
=
1732 (expressionS
*) xmalloc (sizeof (expressionS
));
1733 *symbol_get_obj (sym
)->size
= exp
;
1735 demand_empty_rest_of_line ();
1738 /* Handle the ELF .type pseudo-op. This sets the type of a symbol.
1739 There are six syntaxes:
1741 The first (used on Solaris) is
1743 The second (used on UnixWare) is
1745 The third (reportedly to be used on Irix 6.0) is
1747 The fourth (used on NetBSD/Arm and Linux/ARM) is
1749 The fifth (used on SVR4/860) is
1750 .type SYM,"function"
1751 The sixth (emitted by recent SunPRO under Solaris) is
1753 where the integer is the STT_* value.
1757 obj_elf_type_name (char *cp
)
1761 p
= input_line_pointer
;
1762 if (*input_line_pointer
>= '0'
1763 && *input_line_pointer
<= '9')
1765 while (*input_line_pointer
>= '0'
1766 && *input_line_pointer
<= '9')
1767 ++input_line_pointer
;
1768 *cp
= *input_line_pointer
;
1769 *input_line_pointer
= '\0';
1772 *cp
= get_symbol_end ();
1778 obj_elf_type (int ignore ATTRIBUTE_UNUSED
)
1782 const char *type_name
;
1784 elf_symbol_type
*elfsym
;
1786 sym
= get_sym_from_input_line_and_check ();
1787 c
= *input_line_pointer
;
1788 elfsym
= (elf_symbol_type
*) symbol_get_bfdsym (sym
);
1790 if (*input_line_pointer
== ',')
1791 ++input_line_pointer
;
1794 if ( *input_line_pointer
== '#'
1795 || *input_line_pointer
== '@'
1796 || *input_line_pointer
== '"'
1797 || *input_line_pointer
== '%')
1798 ++input_line_pointer
;
1800 type_name
= obj_elf_type_name (& c
);
1803 if (strcmp (type_name
, "function") == 0
1804 || strcmp (type_name
, "2") == 0
1805 || strcmp (type_name
, "STT_FUNC") == 0)
1806 type
= BSF_FUNCTION
;
1807 else if (strcmp (type_name
, "object") == 0
1808 || strcmp (type_name
, "1") == 0
1809 || strcmp (type_name
, "STT_OBJECT") == 0)
1811 else if (strcmp (type_name
, "tls_object") == 0
1812 || strcmp (type_name
, "6") == 0
1813 || strcmp (type_name
, "STT_TLS") == 0)
1814 type
= BSF_OBJECT
| BSF_THREAD_LOCAL
;
1815 else if (strcmp (type_name
, "notype") == 0
1816 || strcmp (type_name
, "0") == 0
1817 || strcmp (type_name
, "STT_NOTYPE") == 0)
1819 else if (strcmp (type_name
, "common") == 0
1820 || strcmp (type_name
, "5") == 0
1821 || strcmp (type_name
, "STT_COMMON") == 0)
1825 if (! S_IS_COMMON (sym
))
1827 if (S_IS_VOLATILE (sym
))
1829 sym
= symbol_clone (sym
, 1);
1830 S_SET_SEGMENT (sym
, bfd_com_section_ptr
);
1831 S_SET_VALUE (sym
, 0);
1832 S_SET_EXTERNAL (sym
);
1833 symbol_set_frag (sym
, &zero_address_frag
);
1834 S_CLEAR_VOLATILE (sym
);
1836 else if (S_IS_DEFINED (sym
) || symbol_equated_p (sym
))
1837 as_bad (_("symbol '%s' is already defined"), S_GET_NAME (sym
));
1840 /* FIXME: Is it safe to just change the section ? */
1841 S_SET_SEGMENT (sym
, bfd_com_section_ptr
);
1842 S_SET_VALUE (sym
, 0);
1843 S_SET_EXTERNAL (sym
);
1847 else if (strcmp (type_name
, "gnu_indirect_function") == 0
1848 || strcmp (type_name
, "10") == 0
1849 || strcmp (type_name
, "STT_GNU_IFUNC") == 0)
1851 const struct elf_backend_data
*bed
;
1853 bed
= get_elf_backend_data (stdoutput
);
1854 if (!(bed
->elf_osabi
== ELFOSABI_GNU
1855 || bed
->elf_osabi
== ELFOSABI_FREEBSD
1856 /* GNU is still using the default value 0. */
1857 || bed
->elf_osabi
== ELFOSABI_NONE
))
1858 as_bad (_("symbol type \"%s\" is supported only by GNU and FreeBSD targets"),
1860 type
= BSF_FUNCTION
| BSF_GNU_INDIRECT_FUNCTION
;
1862 else if (strcmp (type_name
, "gnu_unique_object") == 0)
1864 struct elf_backend_data
*bed
;
1866 bed
= (struct elf_backend_data
*) get_elf_backend_data (stdoutput
);
1867 if (!(bed
->elf_osabi
== ELFOSABI_GNU
1868 /* GNU is still using the default value 0. */
1869 || bed
->elf_osabi
== ELFOSABI_NONE
))
1870 as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
1872 type
= BSF_OBJECT
| BSF_GNU_UNIQUE
;
1873 /* PR 10549: Always set OSABI field to GNU for objects containing unique symbols. */
1874 bed
->elf_osabi
= ELFOSABI_GNU
;
1876 #ifdef md_elf_symbol_type
1877 else if ((type
= md_elf_symbol_type (type_name
, sym
, elfsym
)) != -1)
1881 as_bad (_("unrecognized symbol type \"%s\""), type_name
);
1883 *input_line_pointer
= c
;
1885 if (*input_line_pointer
== '"')
1886 ++input_line_pointer
;
1888 elfsym
->symbol
.flags
|= type
;
1890 demand_empty_rest_of_line ();
1894 obj_elf_ident (int ignore ATTRIBUTE_UNUSED
)
1896 static segT comment_section
;
1897 segT old_section
= now_seg
;
1898 int old_subsection
= now_subseg
;
1900 #ifdef md_flush_pending_output
1901 md_flush_pending_output ();
1904 if (!comment_section
)
1907 comment_section
= subseg_new (".comment", 0);
1908 bfd_set_section_flags (stdoutput
, comment_section
,
1909 SEC_READONLY
| SEC_HAS_CONTENTS
1910 | SEC_MERGE
| SEC_STRINGS
);
1911 comment_section
->entsize
= 1;
1912 #ifdef md_elf_section_change_hook
1913 md_elf_section_change_hook ();
1919 subseg_set (comment_section
, 0);
1921 subseg_set (old_section
, old_subsection
);
1924 #ifdef INIT_STAB_SECTION
1926 /* The first entry in a .stabs section is special. */
1929 obj_elf_init_stab_section (segT seg
)
1934 unsigned int stroff
;
1936 /* Force the section to align to a longword boundary. Without this,
1937 UnixWare ar crashes. */
1938 bfd_set_section_alignment (stdoutput
, seg
, 2);
1940 /* Make space for this first symbol. */
1944 as_where (&file
, NULL
);
1945 stabstr_name
= (char *) xmalloc (strlen (segment_name (seg
)) + 4);
1946 strcpy (stabstr_name
, segment_name (seg
));
1947 strcat (stabstr_name
, "str");
1948 stroff
= get_stab_string_offset (file
, stabstr_name
);
1949 know (stroff
== 1 || (stroff
== 0 && file
[0] == '\0'));
1950 md_number_to_chars (p
, stroff
, 4);
1951 seg_info (seg
)->stabu
.p
= p
;
1956 /* Fill in the counts in the first entry in a .stabs section. */
1959 adjust_stab_sections (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1966 if (strncmp (".stab", sec
->name
, 5))
1968 if (!strcmp ("str", sec
->name
+ strlen (sec
->name
) - 3))
1971 name
= (char *) alloca (strlen (sec
->name
) + 4);
1972 strcpy (name
, sec
->name
);
1973 strcat (name
, "str");
1974 strsec
= bfd_get_section_by_name (abfd
, name
);
1976 strsz
= bfd_section_size (abfd
, strsec
);
1979 nsyms
= bfd_section_size (abfd
, sec
) / 12 - 1;
1981 p
= seg_info (sec
)->stabu
.p
;
1982 gas_assert (p
!= 0);
1984 bfd_h_put_16 (abfd
, nsyms
, p
+ 6);
1985 bfd_h_put_32 (abfd
, strsz
, p
+ 8);
1988 #ifdef NEED_ECOFF_DEBUG
1990 /* This function is called by the ECOFF code. It is supposed to
1991 record the external symbol information so that the backend can
1992 write it out correctly. The ELF backend doesn't actually handle
1993 this at the moment, so we do it ourselves. We save the information
1996 #ifdef OBJ_MAYBE_ELF
2000 elf_ecoff_set_ext (symbolS
*sym
, struct ecoff_extr
*ext
)
2002 symbol_get_bfdsym (sym
)->udata
.p
= ext
;
2005 /* This function is called by bfd_ecoff_debug_externals. It is
2006 supposed to *EXT to the external symbol information, and return
2007 whether the symbol should be used at all. */
2010 elf_get_extr (asymbol
*sym
, EXTR
*ext
)
2012 if (sym
->udata
.p
== NULL
)
2014 *ext
= *(EXTR
*) sym
->udata
.p
;
2018 /* This function is called by bfd_ecoff_debug_externals. It has
2019 nothing to do for ELF. */
2022 elf_set_index (asymbol
*sym ATTRIBUTE_UNUSED
,
2023 bfd_size_type indx ATTRIBUTE_UNUSED
)
2027 #endif /* NEED_ECOFF_DEBUG */
2030 elf_frob_symbol (symbolS
*symp
, int *puntp
)
2032 struct elf_obj_sy
*sy_obj
;
2035 #ifdef NEED_ECOFF_DEBUG
2036 if (ECOFF_DEBUGGING
)
2037 ecoff_frob_symbol (symp
);
2040 sy_obj
= symbol_get_obj (symp
);
2042 size
= sy_obj
->size
;
2045 if (resolve_expression (size
)
2046 && size
->X_op
== O_constant
)
2047 S_SET_SIZE (symp
, size
->X_add_number
);
2050 if (flag_size_check
== size_check_error
)
2051 as_bad (_(".size expression for %s "
2052 "does not evaluate to a constant"), S_GET_NAME (symp
));
2054 as_warn (_(".size expression for %s "
2055 "does not evaluate to a constant"), S_GET_NAME (symp
));
2057 free (sy_obj
->size
);
2058 sy_obj
->size
= NULL
;
2061 if (sy_obj
->versioned_name
!= NULL
)
2065 p
= strchr (sy_obj
->versioned_name
, ELF_VER_CHR
);
2068 /* This symbol was given a new name with the .symver directive.
2070 If this is an external reference, just rename the symbol to
2071 include the version string. This will make the relocs be
2072 against the correct versioned symbol.
2074 If this is a definition, add an alias. FIXME: Using an alias
2075 will permit the debugging information to refer to the right
2076 symbol. However, it's not clear whether it is the best
2079 if (! S_IS_DEFINED (symp
))
2081 /* Verify that the name isn't using the @@ syntax--this is
2082 reserved for definitions of the default version to link
2084 if (p
[1] == ELF_VER_CHR
)
2086 as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"),
2087 sy_obj
->versioned_name
);
2090 S_SET_NAME (symp
, sy_obj
->versioned_name
);
2094 if (p
[1] == ELF_VER_CHR
&& p
[2] == ELF_VER_CHR
)
2098 /* The @@@ syntax is a special case. It renames the
2099 symbol name to versioned_name with one `@' removed. */
2100 l
= strlen (&p
[3]) + 1;
2101 memmove (&p
[2], &p
[3], l
);
2102 S_SET_NAME (symp
, sy_obj
->versioned_name
);
2108 /* FIXME: Creating a new symbol here is risky. We're
2109 in the final loop over the symbol table. We can
2110 get away with it only because the symbol goes to
2111 the end of the list, where the loop will still see
2112 it. It would probably be better to do this in
2113 obj_frob_file_before_adjust. */
2115 symp2
= symbol_find_or_make (sy_obj
->versioned_name
);
2117 /* Now we act as though we saw symp2 = sym. */
2119 S_SET_SEGMENT (symp2
, S_GET_SEGMENT (symp
));
2121 /* Subtracting out the frag address here is a hack
2122 because we are in the middle of the final loop. */
2125 - symbol_get_frag (symp
)->fr_address
));
2127 symbol_set_frag (symp2
, symbol_get_frag (symp
));
2129 /* This will copy over the size information. */
2130 copy_symbol_attributes (symp2
, symp
);
2132 S_SET_OTHER (symp2
, S_GET_OTHER (symp
));
2134 if (S_IS_WEAK (symp
))
2137 if (S_IS_EXTERNAL (symp
))
2138 S_SET_EXTERNAL (symp2
);
2143 /* Double check weak symbols. */
2144 if (S_IS_WEAK (symp
))
2146 if (S_IS_COMMON (symp
))
2147 as_bad (_("symbol `%s' can not be both weak and common"),
2152 /* The Irix 5 and 6 assemblers set the type of any common symbol and
2153 any undefined non-function symbol to STT_OBJECT. We try to be
2154 compatible, since newer Irix 5 and 6 linkers care. However, we
2155 only set undefined symbols to be STT_OBJECT if we are on Irix,
2156 because that is the only time gcc will generate the necessary
2157 .global directives to mark functions. */
2159 if (S_IS_COMMON (symp
))
2160 symbol_get_bfdsym (symp
)->flags
|= BSF_OBJECT
;
2162 if (strstr (TARGET_OS
, "irix") != NULL
2163 && ! S_IS_DEFINED (symp
)
2164 && (symbol_get_bfdsym (symp
)->flags
& BSF_FUNCTION
) == 0)
2165 symbol_get_bfdsym (symp
)->flags
|= BSF_OBJECT
;
2171 asection
**head
; /* Section lists. */
2172 unsigned int *elt_count
; /* Number of sections in each list. */
2173 unsigned int num_group
; /* Number of lists. */
2174 struct hash_control
*indexes
; /* Maps group name to index in head array. */
2177 /* Called via bfd_map_over_sections. If SEC is a member of a group,
2178 add it to a list of sections belonging to the group. INF is a
2179 pointer to a struct group_list, which is where we store the head of
2183 build_group_lists (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
2185 struct group_list
*list
= (struct group_list
*) inf
;
2186 const char *group_name
= elf_group_name (sec
);
2188 unsigned int *elem_idx
;
2189 unsigned int *idx_ptr
;
2191 if (group_name
== NULL
)
2194 /* If this group already has a list, add the section to the head of
2196 elem_idx
= (unsigned int *) hash_find (list
->indexes
, group_name
);
2197 if (elem_idx
!= NULL
)
2199 elf_next_in_group (sec
) = list
->head
[*elem_idx
];
2200 list
->head
[*elem_idx
] = sec
;
2201 list
->elt_count
[*elem_idx
] += 1;
2205 /* New group. Make the arrays bigger in chunks to minimize calls to
2207 i
= list
->num_group
;
2210 unsigned int newsize
= i
+ 128;
2211 list
->head
= (asection
**) xrealloc (list
->head
,
2212 newsize
* sizeof (*list
->head
));
2213 list
->elt_count
= (unsigned int *)
2214 xrealloc (list
->elt_count
, newsize
* sizeof (*list
->elt_count
));
2216 list
->head
[i
] = sec
;
2217 list
->elt_count
[i
] = 1;
2218 list
->num_group
+= 1;
2220 /* Add index to hash. */
2221 idx_ptr
= (unsigned int *) xmalloc (sizeof (unsigned int));
2223 hash_insert (list
->indexes
, group_name
, idx_ptr
);
2226 static void free_section_idx (const char *key ATTRIBUTE_UNUSED
, void *val
)
2228 free ((unsigned int *) val
);
2232 elf_adjust_symtab (void)
2234 struct group_list list
;
2237 /* Go find section groups. */
2240 list
.elt_count
= NULL
;
2241 list
.indexes
= hash_new ();
2242 bfd_map_over_sections (stdoutput
, build_group_lists
, &list
);
2244 /* Make the SHT_GROUP sections that describe each section group. We
2245 can't set up the section contents here yet, because elf section
2246 indices have yet to be calculated. elf.c:set_group_contents does
2247 the rest of the work. */
2248 for (i
= 0; i
< list
.num_group
; i
++)
2250 const char *group_name
= elf_group_name (list
.head
[i
]);
2251 const char *sec_name
;
2257 flags
= SEC_READONLY
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_GROUP
;
2258 for (s
= list
.head
[i
]; s
!= NULL
; s
= elf_next_in_group (s
))
2259 if ((s
->flags
^ flags
) & SEC_LINK_ONCE
)
2261 flags
|= SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_DISCARD
;
2262 if (s
!= list
.head
[i
])
2264 as_warn (_("assuming all members of group `%s' are COMDAT"),
2270 sec_name
= ".group";
2271 s
= subseg_force_new (sec_name
, 0);
2273 || !bfd_set_section_flags (stdoutput
, s
, flags
)
2274 || !bfd_set_section_alignment (stdoutput
, s
, 2))
2276 as_fatal (_("can't create group: %s"),
2277 bfd_errmsg (bfd_get_error ()));
2279 elf_section_type (s
) = SHT_GROUP
;
2281 /* Pass a pointer to the first section in this group. */
2282 elf_next_in_group (s
) = list
.head
[i
];
2283 /* Make sure that the signature symbol for the group has the
2284 name of the group. */
2285 sy
= symbol_find_exact (group_name
);
2287 || (sy
!= symbol_lastP
2288 && (sy
->sy_next
== NULL
2289 || sy
->sy_next
->sy_previous
!= sy
)))
2291 /* Create the symbol now. */
2292 sy
= symbol_new (group_name
, now_seg
, (valueT
) 0, frag_now
);
2294 /* Before Solaris 11 build 154, Sun ld rejects local group
2295 signature symbols, so make them weak hidden instead. */
2296 symbol_get_bfdsym (sy
)->flags
|= BSF_WEAK
;
2297 S_SET_OTHER (sy
, STV_HIDDEN
);
2299 symbol_get_obj (sy
)->local
= 1;
2301 symbol_table_insert (sy
);
2303 elf_group_id (s
) = symbol_get_bfdsym (sy
);
2305 size
= 4 * (list
.elt_count
[i
] + 1);
2306 bfd_set_section_size (stdoutput
, s
, size
);
2307 s
->contents
= (unsigned char *) frag_more (size
);
2308 frag_now
->fr_fix
= frag_now_fix_octets ();
2309 frag_wane (frag_now
);
2313 hash_traverse (list
.indexes
, free_section_idx
);
2314 hash_die (list
.indexes
);
2318 elf_frob_file (void)
2320 bfd_map_over_sections (stdoutput
, adjust_stab_sections
, NULL
);
2322 #ifdef elf_tc_final_processing
2323 elf_tc_final_processing ();
2327 /* It removes any unneeded versioned symbols from the symbol table. */
2330 elf_frob_file_before_adjust (void)
2336 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
2337 if (!S_IS_DEFINED (symp
))
2339 if (symbol_get_obj (symp
)->versioned_name
)
2343 /* The @@@ syntax is a special case. If the symbol is
2344 not defined, 2 `@'s will be removed from the
2347 p
= strchr (symbol_get_obj (symp
)->versioned_name
,
2350 if (p
[1] == ELF_VER_CHR
&& p
[2] == ELF_VER_CHR
)
2352 size_t l
= strlen (&p
[3]) + 1;
2353 memmove (&p
[1], &p
[3], l
);
2355 if (symbol_used_p (symp
) == 0
2356 && symbol_used_in_reloc_p (symp
) == 0)
2357 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2360 /* If there was .weak foo, but foo was neither defined nor
2361 used anywhere, remove it. */
2363 else if (S_IS_WEAK (symp
)
2364 && symbol_used_p (symp
) == 0
2365 && symbol_used_in_reloc_p (symp
) == 0)
2366 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2371 /* It is required that we let write_relocs have the opportunity to
2372 optimize away fixups before output has begun, since it is possible
2373 to eliminate all fixups for a section and thus we never should
2374 have generated the relocation section. */
2377 elf_frob_file_after_relocs (void)
2379 #ifdef NEED_ECOFF_DEBUG
2380 if (ECOFF_DEBUGGING
)
2381 /* Generate the ECOFF debugging information. */
2383 const struct ecoff_debug_swap
*debug_swap
;
2384 struct ecoff_debug_info debug
;
2389 = get_elf_backend_data (stdoutput
)->elf_backend_ecoff_debug_swap
;
2390 know (debug_swap
!= NULL
);
2391 ecoff_build_debug (&debug
.symbolic_header
, &buf
, debug_swap
);
2393 /* Set up the pointers in debug. */
2394 #define SET(ptr, offset, type) \
2395 debug.ptr = (type) (buf + debug.symbolic_header.offset)
2397 SET (line
, cbLineOffset
, unsigned char *);
2398 SET (external_dnr
, cbDnOffset
, void *);
2399 SET (external_pdr
, cbPdOffset
, void *);
2400 SET (external_sym
, cbSymOffset
, void *);
2401 SET (external_opt
, cbOptOffset
, void *);
2402 SET (external_aux
, cbAuxOffset
, union aux_ext
*);
2403 SET (ss
, cbSsOffset
, char *);
2404 SET (external_fdr
, cbFdOffset
, void *);
2405 SET (external_rfd
, cbRfdOffset
, void *);
2406 /* ssext and external_ext are set up just below. */
2410 /* Set up the external symbols. */
2411 debug
.ssext
= debug
.ssext_end
= NULL
;
2412 debug
.external_ext
= debug
.external_ext_end
= NULL
;
2413 if (! bfd_ecoff_debug_externals (stdoutput
, &debug
, debug_swap
, TRUE
,
2414 elf_get_extr
, elf_set_index
))
2415 as_fatal (_("failed to set up debugging information: %s"),
2416 bfd_errmsg (bfd_get_error ()));
2418 sec
= bfd_get_section_by_name (stdoutput
, ".mdebug");
2419 gas_assert (sec
!= NULL
);
2421 know (!stdoutput
->output_has_begun
);
2423 /* We set the size of the section, call bfd_set_section_contents
2424 to force the ELF backend to allocate a file position, and then
2425 write out the data. FIXME: Is this really the best way to do
2427 bfd_set_section_size
2428 (stdoutput
, sec
, bfd_ecoff_debug_size (stdoutput
, &debug
, debug_swap
));
2430 /* Pass BUF to bfd_set_section_contents because this will
2431 eventually become a call to fwrite, and ISO C prohibits
2432 passing a NULL pointer to a stdio function even if the
2433 pointer will not be used. */
2434 if (! bfd_set_section_contents (stdoutput
, sec
, buf
, 0, 0))
2435 as_fatal (_("can't start writing .mdebug section: %s"),
2436 bfd_errmsg (bfd_get_error ()));
2438 know (stdoutput
->output_has_begun
);
2439 know (sec
->filepos
!= 0);
2441 if (! bfd_ecoff_write_debug (stdoutput
, &debug
, debug_swap
,
2443 as_fatal (_("could not write .mdebug section: %s"),
2444 bfd_errmsg (bfd_get_error ()));
2446 #endif /* NEED_ECOFF_DEBUG */
2451 /* Heavily plagiarized from obj_elf_version. The idea is to emit the
2452 SCO specific identifier in the .notes section to satisfy the SCO
2455 This looks more complicated than it really is. As opposed to the
2456 "obvious" solution, this should handle the cross dev cases
2457 correctly. (i.e, hosting on a 64 bit big endian processor, but
2458 generating SCO Elf code) Efficiency isn't a concern, as there
2459 should be exactly one of these sections per object module.
2461 SCO OpenServer 5 identifies it's ELF modules with a standard ELF
2464 int_32 namesz = 4 ; Name size
2465 int_32 descsz = 12 ; Descriptive information
2467 char name[4] = "SCO" ; Originator name ALWAYS SCO + NULL
2468 int_32 version = (major ver # << 16) | version of tools ;
2469 int_32 source = (tool_id << 16 ) | 1 ;
2470 int_32 info = 0 ; These are set by the SCO tools, but we
2471 don't know enough about the source
2472 environment to set them. SCO ld currently
2473 ignores them, and recommends we set them
2476 #define SCO_MAJOR_VERSION 0x1
2477 #define SCO_MINOR_VERSION 0x1
2487 asection
*seg
= now_seg
;
2488 subsegT subseg
= now_subseg
;
2489 Elf_Internal_Note i_note
;
2490 Elf_External_Note e_note
;
2491 asection
*note_secp
= NULL
;
2494 /* create the .note section */
2496 note_secp
= subseg_new (".note", 0);
2497 bfd_set_section_flags (stdoutput
,
2499 SEC_HAS_CONTENTS
| SEC_READONLY
);
2501 /* process the version string */
2504 i_note
.descsz
= 12; /* 12 descriptive bytes */
2505 i_note
.type
= NT_VERSION
; /* Contains a version string */
2507 p
= frag_more (sizeof (i_note
.namesz
));
2508 md_number_to_chars (p
, i_note
.namesz
, 4);
2510 p
= frag_more (sizeof (i_note
.descsz
));
2511 md_number_to_chars (p
, i_note
.descsz
, 4);
2513 p
= frag_more (sizeof (i_note
.type
));
2514 md_number_to_chars (p
, i_note
.type
, 4);
2519 /* Note: this is the version number of the ELF we're representing */
2521 md_number_to_chars (p
, (SCO_MAJOR_VERSION
<< 16) | (SCO_MINOR_VERSION
), 4);
2523 /* Here, we pick a magic number for ourselves (yes, I "registered"
2524 it with SCO. The bottom bit shows that we are compat with the
2527 md_number_to_chars (p
, 0x4c520000 | 0x0001, 4);
2529 /* If we knew (or cared) what the source language options were, we'd
2530 fill them in here. SCO has given us permission to ignore these
2531 and just set them to zero. */
2533 md_number_to_chars (p
, 0x0000, 4);
2535 frag_align (2, 0, 0);
2537 /* We probably can't restore the current segment, for there likely
2540 subseg_set (seg
, subseg
);
2544 #endif /* SCO_ELF */
2547 elf_generate_asm_lineno (void)
2549 #ifdef NEED_ECOFF_DEBUG
2550 if (ECOFF_DEBUGGING
)
2551 ecoff_generate_asm_lineno ();
2556 elf_process_stab (segT sec ATTRIBUTE_UNUSED
,
2557 int what ATTRIBUTE_UNUSED
,
2558 const char *string ATTRIBUTE_UNUSED
,
2559 int type ATTRIBUTE_UNUSED
,
2560 int other ATTRIBUTE_UNUSED
,
2561 int desc ATTRIBUTE_UNUSED
)
2563 #ifdef NEED_ECOFF_DEBUG
2564 if (ECOFF_DEBUGGING
)
2565 ecoff_stab (sec
, what
, string
, type
, other
, desc
);
2570 elf_separate_stab_sections (void)
2572 #ifdef NEED_ECOFF_DEBUG
2573 return (!ECOFF_DEBUGGING
);
2580 elf_init_stab_section (segT seg
)
2582 #ifdef NEED_ECOFF_DEBUG
2583 if (!ECOFF_DEBUGGING
)
2585 obj_elf_init_stab_section (seg
);
2588 const struct format_ops elf_format_ops
=
2590 bfd_target_elf_flavour
,
2591 0, /* dfl_leading_underscore */
2592 1, /* emit_section_symbols */
2597 elf_frob_file_before_adjust
,
2598 0, /* obj_frob_file_before_fix */
2599 elf_frob_file_after_relocs
,
2600 elf_s_get_size
, elf_s_set_size
,
2601 elf_s_get_align
, elf_s_set_align
,
2608 elf_copy_symbol_attributes
,
2609 elf_generate_asm_lineno
,
2611 elf_separate_stab_sections
,
2612 elf_init_stab_section
,
2613 elf_sec_sym_ok_for_reloc
,
2615 #ifdef NEED_ECOFF_DEBUG
2618 0, /* ecoff_set_ext */
2620 elf_obj_read_begin_hook
,
2621 elf_obj_symbol_new_hook
,