1 /* ELF object file format
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 3,
11 or (at your option) any later version.
13 GAS is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 the GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 #define OBJ_HEADER "obj-elf.h"
25 #include "safe-ctype.h"
28 #include "struc-symbol.h"
29 #include "dwarf2dbg.h"
31 #ifndef ECOFF_DEBUGGING
32 #define ECOFF_DEBUGGING 0
34 #define NEED_ECOFF_DEBUG
37 #ifdef NEED_ECOFF_DEBUG
42 #include "elf/alpha.h"
58 #include "elf/x86-64.h"
65 static void obj_elf_line (int);
66 static void obj_elf_size (int);
67 static void obj_elf_type (int);
68 static void obj_elf_ident (int);
69 static void obj_elf_weak (int);
70 static void obj_elf_local (int);
71 static void obj_elf_visibility (int);
72 static void obj_elf_symver (int);
73 static void obj_elf_subsection (int);
74 static void obj_elf_popsection (int);
75 static void obj_elf_tls_common (int);
76 static void obj_elf_lcomm (int);
77 static void obj_elf_struct (int);
79 static const pseudo_typeS elf_pseudo_table
[] =
81 {"comm", obj_elf_common
, 0},
82 {"common", obj_elf_common
, 1},
83 {"ident", obj_elf_ident
, 0},
84 {"lcomm", obj_elf_lcomm
, 0},
85 {"local", obj_elf_local
, 0},
86 {"previous", obj_elf_previous
, 0},
87 {"section", obj_elf_section
, 0},
88 {"section.s", obj_elf_section
, 0},
89 {"sect", obj_elf_section
, 0},
90 {"sect.s", obj_elf_section
, 0},
91 {"pushsection", obj_elf_section
, 1},
92 {"popsection", obj_elf_popsection
, 0},
93 {"size", obj_elf_size
, 0},
94 {"type", obj_elf_type
, 0},
95 {"version", obj_elf_version
, 0},
96 {"weak", obj_elf_weak
, 0},
98 /* These define symbol visibility. */
99 {"internal", obj_elf_visibility
, STV_INTERNAL
},
100 {"hidden", obj_elf_visibility
, STV_HIDDEN
},
101 {"protected", obj_elf_visibility
, STV_PROTECTED
},
103 /* These are used for stabs-in-elf configurations. */
104 {"line", obj_elf_line
, 0},
106 /* This is a GNU extension to handle symbol versions. */
107 {"symver", obj_elf_symver
, 0},
109 /* A GNU extension to change subsection only. */
110 {"subsection", obj_elf_subsection
, 0},
112 /* These are GNU extensions to aid in garbage collecting C++ vtables. */
113 {"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit
, 0},
114 {"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry
, 0},
116 /* These are used for dwarf. */
120 /* These are used for dwarf2. */
121 { "file", (void (*) (int)) dwarf2_directive_file
, 0 },
122 { "loc", dwarf2_directive_loc
, 0 },
123 { "loc_mark_labels", dwarf2_directive_loc_mark_labels
, 0 },
125 /* We need to trap the section changing calls to handle .previous. */
126 {"data", obj_elf_data
, 0},
127 {"offset", obj_elf_struct
, 0},
128 {"struct", obj_elf_struct
, 0},
129 {"text", obj_elf_text
, 0},
131 {"tls_common", obj_elf_tls_common
, 0},
137 static const pseudo_typeS ecoff_debug_pseudo_table
[] =
139 #ifdef NEED_ECOFF_DEBUG
140 /* COFF style debugging information for ECOFF. .ln is not used; .loc
142 { "def", ecoff_directive_def
, 0 },
143 { "dim", ecoff_directive_dim
, 0 },
144 { "endef", ecoff_directive_endef
, 0 },
145 { "file", ecoff_directive_file
, 0 },
146 { "scl", ecoff_directive_scl
, 0 },
147 { "tag", ecoff_directive_tag
, 0 },
148 { "val", ecoff_directive_val
, 0 },
150 /* COFF debugging requires pseudo-ops .size and .type, but ELF
151 already has meanings for those. We use .esize and .etype
152 instead. These are only generated by gcc anyhow. */
153 { "esize", ecoff_directive_size
, 0 },
154 { "etype", ecoff_directive_type
, 0 },
156 /* ECOFF specific debugging information. */
157 { "begin", ecoff_directive_begin
, 0 },
158 { "bend", ecoff_directive_bend
, 0 },
159 { "end", ecoff_directive_end
, 0 },
160 { "ent", ecoff_directive_ent
, 0 },
161 { "fmask", ecoff_directive_fmask
, 0 },
162 { "frame", ecoff_directive_frame
, 0 },
163 { "loc", ecoff_directive_loc
, 0 },
164 { "mask", ecoff_directive_mask
, 0 },
166 /* Other ECOFF directives. */
167 { "extern", ecoff_directive_extern
, 0 },
169 /* These are used on Irix. I don't know how to implement them. */
170 { "alias", s_ignore
, 0 },
171 { "bgnb", s_ignore
, 0 },
172 { "endb", s_ignore
, 0 },
173 { "lab", s_ignore
, 0 },
174 { "noalias", s_ignore
, 0 },
175 { "verstamp", s_ignore
, 0 },
176 { "vreg", s_ignore
, 0 },
179 {NULL
, NULL
, 0} /* end sentinel */
183 #include "aout/aout64.h"
185 /* This is called when the assembler starts. */
187 asection
*elf_com_section_ptr
;
194 /* Add symbols for the known sections to the symbol table. */
195 s
= bfd_get_section_by_name (stdoutput
, TEXT_SECTION_NAME
);
196 symbol_table_insert (section_symbol (s
));
197 s
= bfd_get_section_by_name (stdoutput
, DATA_SECTION_NAME
);
198 symbol_table_insert (section_symbol (s
));
199 s
= bfd_get_section_by_name (stdoutput
, BSS_SECTION_NAME
);
200 symbol_table_insert (section_symbol (s
));
201 elf_com_section_ptr
= bfd_com_section_ptr
;
205 elf_pop_insert (void)
207 pop_insert (elf_pseudo_table
);
209 pop_insert (ecoff_debug_pseudo_table
);
213 elf_s_get_size (symbolS
*sym
)
215 return S_GET_SIZE (sym
);
219 elf_s_set_size (symbolS
*sym
, bfd_vma sz
)
221 S_SET_SIZE (sym
, sz
);
225 elf_s_get_align (symbolS
*sym
)
227 return S_GET_ALIGN (sym
);
231 elf_s_set_align (symbolS
*sym
, bfd_vma align
)
233 S_SET_ALIGN (sym
, align
);
237 elf_s_get_other (symbolS
*sym
)
239 return elf_symbol (symbol_get_bfdsym (sym
))->internal_elf_sym
.st_other
;
243 elf_s_set_other (symbolS
*sym
, int other
)
245 S_SET_OTHER (sym
, other
);
249 elf_sec_sym_ok_for_reloc (asection
*sec
)
251 return obj_sec_sym_ok_for_reloc (sec
);
255 elf_file_symbol (const char *s
, int appfile
)
258 || symbol_rootP
== NULL
259 || symbol_rootP
->bsym
== NULL
260 || (symbol_rootP
->bsym
->flags
& BSF_FILE
) == 0)
264 sym
= symbol_new (s
, absolute_section
, 0, NULL
);
265 symbol_set_frag (sym
, &zero_address_frag
);
266 symbol_get_bfdsym (sym
)->flags
|= BSF_FILE
;
268 if (symbol_rootP
!= sym
)
270 symbol_remove (sym
, &symbol_rootP
, &symbol_lastP
);
271 symbol_insert (sym
, symbol_rootP
, &symbol_rootP
, &symbol_lastP
);
273 verify_symbol_chain (symbol_rootP
, symbol_lastP
);
278 #ifdef NEED_ECOFF_DEBUG
279 ecoff_new_file (s
, appfile
);
283 /* Called from read.c:s_comm after we've parsed .comm symbol, size.
284 Parse a possible alignment value. */
287 elf_common_parse (int ignore ATTRIBUTE_UNUSED
, symbolS
*symbolP
, addressT size
)
290 int is_local
= symbol_get_obj (symbolP
)->local
;
292 if (*input_line_pointer
== ',')
294 char *save
= input_line_pointer
;
296 input_line_pointer
++;
299 if (*input_line_pointer
== '"')
301 /* For sparc. Accept .common symbol, length, "bss" */
302 input_line_pointer
++;
303 /* Some use the dot, some don't. */
304 if (*input_line_pointer
== '.')
305 input_line_pointer
++;
306 /* Some say data, some say bss. */
307 if (strncmp (input_line_pointer
, "bss\"", 4) == 0)
308 input_line_pointer
+= 4;
309 else if (strncmp (input_line_pointer
, "data\"", 5) == 0)
310 input_line_pointer
+= 5;
313 char *p
= input_line_pointer
;
318 while (!is_end_of_line
[(unsigned char) *input_line_pointer
])
319 if (*input_line_pointer
++ == '"')
321 c
= *input_line_pointer
;
322 *input_line_pointer
= '\0';
323 as_bad (_("bad .common segment %s"), p
);
324 *input_line_pointer
= c
;
325 ignore_rest_of_line ();
328 /* ??? Don't ask me why these are always global. */
333 input_line_pointer
= save
;
334 align
= parse_align (is_local
);
335 if (align
== (addressT
) -1)
342 bss_alloc (symbolP
, size
, align
);
343 S_CLEAR_EXTERNAL (symbolP
);
347 S_SET_VALUE (symbolP
, size
);
348 S_SET_ALIGN (symbolP
, align
);
349 S_SET_EXTERNAL (symbolP
);
350 S_SET_SEGMENT (symbolP
, elf_com_section_ptr
);
353 symbol_get_bfdsym (symbolP
)->flags
|= BSF_OBJECT
;
359 obj_elf_common (int is_common
)
361 if (flag_mri
&& is_common
)
364 s_comm_internal (0, elf_common_parse
);
368 obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED
)
370 symbolS
*symbolP
= s_comm_internal (0, elf_common_parse
);
373 symbol_get_bfdsym (symbolP
)->flags
|= BSF_THREAD_LOCAL
;
377 obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED
)
379 symbolS
*symbolP
= s_comm_internal (0, s_lcomm_internal
);
382 symbol_get_bfdsym (symbolP
)->flags
|= BSF_OBJECT
;
386 obj_elf_local (int ignore ATTRIBUTE_UNUSED
)
394 name
= input_line_pointer
;
395 c
= get_symbol_end ();
396 symbolP
= symbol_find_or_make (name
);
397 *input_line_pointer
= c
;
399 S_CLEAR_EXTERNAL (symbolP
);
400 symbol_get_obj (symbolP
)->local
= 1;
403 input_line_pointer
++;
405 if (*input_line_pointer
== '\n')
410 demand_empty_rest_of_line ();
414 obj_elf_weak (int ignore ATTRIBUTE_UNUSED
)
422 name
= input_line_pointer
;
423 c
= get_symbol_end ();
424 symbolP
= symbol_find_or_make (name
);
425 *input_line_pointer
= c
;
427 S_SET_WEAK (symbolP
);
428 symbol_get_obj (symbolP
)->local
= 1;
431 input_line_pointer
++;
433 if (*input_line_pointer
== '\n')
438 demand_empty_rest_of_line ();
442 obj_elf_visibility (int visibility
)
448 elf_symbol_type
*elfsym
;
452 name
= input_line_pointer
;
453 c
= get_symbol_end ();
454 symbolP
= symbol_find_or_make (name
);
455 *input_line_pointer
= c
;
459 bfdsym
= symbol_get_bfdsym (symbolP
);
460 elfsym
= elf_symbol_from (bfd_asymbol_bfd (bfdsym
), bfdsym
);
464 elfsym
->internal_elf_sym
.st_other
&= ~3;
465 elfsym
->internal_elf_sym
.st_other
|= visibility
;
469 input_line_pointer
++;
473 if (*input_line_pointer
== '\n')
479 demand_empty_rest_of_line ();
482 static segT previous_section
;
483 static int previous_subsection
;
487 struct section_stack
*next
;
489 int subseg
, prev_subseg
;
492 static struct section_stack
*section_stack
;
495 get_section (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
497 const char *gname
= inf
;
498 const char *group_name
= elf_group_name (sec
);
500 return (group_name
== gname
501 || (group_name
!= NULL
503 && strcmp (group_name
, gname
) == 0));
506 /* Handle the .section pseudo-op. This code supports two different
509 The first is found on Solaris, and looks like
510 .section ".sec1",#alloc,#execinstr,#write
511 Here the names after '#' are the SHF_* flags to turn on for the
512 section. I'm not sure how it determines the SHT_* type (BFD
513 doesn't really give us control over the type, anyhow).
515 The second format is found on UnixWare, and probably most SVR4
516 machines, and looks like
517 .section .sec1,"a",@progbits
518 The quoted string may contain any combination of a, w, x, and
519 represents the SHF_* flags to turn on for the section. The string
520 beginning with '@' can be progbits or nobits. There should be
521 other possibilities, but I don't know what they are. In any case,
522 BFD doesn't really let us set the section type. */
525 obj_elf_change_section (const char *name
,
529 const char *group_name
,
536 const struct elf_backend_data
*bed
;
537 const struct bfd_elf_special_section
*ssect
;
539 #ifdef md_flush_pending_output
540 md_flush_pending_output ();
543 /* Switch to the section, creating it if necessary. */
546 struct section_stack
*elt
;
547 elt
= xmalloc (sizeof (struct section_stack
));
548 elt
->next
= section_stack
;
550 elt
->prev_seg
= previous_section
;
551 elt
->subseg
= now_subseg
;
552 elt
->prev_subseg
= previous_subsection
;
555 previous_section
= now_seg
;
556 previous_subsection
= now_subseg
;
558 old_sec
= bfd_get_section_by_name_if (stdoutput
, name
, get_section
,
559 (void *) group_name
);
566 sec
= subseg_force_new (name
, 0);
568 bed
= get_elf_backend_data (stdoutput
);
569 ssect
= (*bed
->get_sec_type_attr
) (stdoutput
, sec
);
573 bfd_boolean override
= FALSE
;
575 if (type
== SHT_NULL
)
577 else if (type
!= ssect
->type
)
580 /* FIXME: gcc, as of 2002-10-22, will emit
582 .section .init_array,"aw",@progbits
584 for __attribute__ ((section (".init_array"))).
585 "@progbits" is incorrect. Also for x86-64 large bss
586 sections, gcc, as of 2005-07-06, will emit
588 .section .lbss,"aw",@progbits
590 "@progbits" is incorrect. */
592 && (bed
->s
->arch_size
!= 64
593 || !(ssect
->attr
& SHF_X86_64_LARGE
))
595 && ssect
->type
!= SHT_INIT_ARRAY
596 && ssect
->type
!= SHT_FINI_ARRAY
597 && ssect
->type
!= SHT_PREINIT_ARRAY
)
599 /* We allow to specify any type for a .note section. */
600 if (ssect
->type
!= SHT_NOTE
)
601 as_warn (_("setting incorrect section type for %s"),
606 as_warn (_("ignoring incorrect section type for %s"),
612 if (old_sec
== NULL
&& (attr
& ~ssect
->attr
) != 0)
614 /* As a GNU extension, we permit a .note section to be
615 allocatable. If the linker sees an allocatable .note
616 section, it will create a PT_NOTE segment in the output
617 file. We also allow "x" for .note.GNU-stack. */
618 if (ssect
->type
== SHT_NOTE
619 && (attr
== SHF_ALLOC
|| attr
== SHF_EXECINSTR
))
621 /* Allow different SHF_MERGE and SHF_STRINGS if we have
622 something like .rodata.str. */
623 else if (ssect
->suffix_length
== -2
624 && name
[ssect
->prefix_length
] == '.'
628 & ~SHF_STRINGS
) == 0)
630 /* .interp, .strtab and .symtab can have SHF_ALLOC. */
631 else if (attr
== SHF_ALLOC
632 && (strcmp (name
, ".interp") == 0
633 || strcmp (name
, ".strtab") == 0
634 || strcmp (name
, ".symtab") == 0))
636 /* .note.GNU-stack can have SHF_EXECINSTR. */
637 else if (attr
== SHF_EXECINSTR
638 && strcmp (name
, ".note.GNU-stack") == 0)
641 /* A section on Alpha may have SHF_ALPHA_GPREL. */
642 else if ((attr
& ~ssect
->attr
) == SHF_ALPHA_GPREL
)
647 if (group_name
== NULL
)
648 as_warn (_("setting incorrect section attributes for %s"),
653 if (!override
&& old_sec
== NULL
)
657 /* Convert ELF type and flags to BFD flags. */
659 | ((attr
& SHF_WRITE
) ? 0 : SEC_READONLY
)
660 | ((attr
& SHF_ALLOC
) ? SEC_ALLOC
: 0)
661 | (((attr
& SHF_ALLOC
) && type
!= SHT_NOBITS
) ? SEC_LOAD
: 0)
662 | ((attr
& SHF_EXECINSTR
) ? SEC_CODE
: 0)
663 | ((attr
& SHF_MERGE
) ? SEC_MERGE
: 0)
664 | ((attr
& SHF_STRINGS
) ? SEC_STRINGS
: 0)
665 | ((attr
& SHF_TLS
) ? SEC_THREAD_LOCAL
: 0));
666 #ifdef md_elf_section_flags
667 flags
= md_elf_section_flags (flags
, attr
, type
);
671 flags
|= SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_DISCARD
;
677 elf_section_type (sec
) = type
;
678 elf_section_flags (sec
) = attr
;
680 /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */
681 if (type
== SHT_NOBITS
)
682 seg_info (sec
)->bss
= 1;
684 bfd_set_section_flags (stdoutput
, sec
, flags
);
685 if (flags
& SEC_MERGE
)
686 sec
->entsize
= entsize
;
687 elf_group_name (sec
) = group_name
;
689 /* Add a symbol for this section to the symbol table. */
690 secsym
= symbol_find (name
);
692 symbol_set_bfdsym (secsym
, sec
->symbol
);
694 symbol_table_insert (section_symbol (sec
));
699 && (unsigned) type
!= elf_section_type (old_sec
))
700 as_warn (_("ignoring changed section type for %s"), name
);
704 /* If section attributes are specified the second time we see a
705 particular section, then check that they are the same as we
706 saw the first time. */
707 if (((old_sec
->flags
^ flags
)
708 & (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_CODE
709 | SEC_EXCLUDE
| SEC_SORT_ENTRIES
| SEC_MERGE
| SEC_STRINGS
710 | SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_DISCARD
711 | SEC_THREAD_LOCAL
)))
712 as_warn (_("ignoring changed section attributes for %s"), name
);
713 if ((flags
& SEC_MERGE
) && old_sec
->entsize
!= (unsigned) entsize
)
714 as_warn (_("ignoring changed section entity size for %s"), name
);
718 #ifdef md_elf_section_change_hook
719 md_elf_section_change_hook ();
724 obj_elf_parse_section_letters (char *str
, size_t len
)
739 attr
|= SHF_EXECINSTR
;
755 if (*(str
- 1) == 'a')
758 if (len
> 1 && str
[1] == 's')
767 char *bad_msg
= _("unrecognized .section attribute: want a,w,x,M,S,G,T");
768 #ifdef md_elf_section_letter
769 int md_attr
= md_elf_section_letter (*str
, &bad_msg
);
774 as_fatal ("%s", bad_msg
);
785 obj_elf_section_type (char *str
, size_t len
, bfd_boolean warn
)
787 if (len
== 8 && strncmp (str
, "progbits", 8) == 0)
789 if (len
== 6 && strncmp (str
, "nobits", 6) == 0)
791 if (len
== 4 && strncmp (str
, "note", 4) == 0)
793 if (len
== 10 && strncmp (str
, "init_array", 10) == 0)
794 return SHT_INIT_ARRAY
;
795 if (len
== 10 && strncmp (str
, "fini_array", 10) == 0)
796 return SHT_FINI_ARRAY
;
797 if (len
== 13 && strncmp (str
, "preinit_array", 13) == 0)
798 return SHT_PREINIT_ARRAY
;
800 #ifdef md_elf_section_type
802 int md_type
= md_elf_section_type (str
, len
);
809 as_warn (_("unrecognized section type"));
814 obj_elf_section_word (char *str
, size_t len
, int *type
)
818 if (len
== 5 && strncmp (str
, "write", 5) == 0)
820 if (len
== 5 && strncmp (str
, "alloc", 5) == 0)
822 if (len
== 9 && strncmp (str
, "execinstr", 9) == 0)
823 return SHF_EXECINSTR
;
824 if (len
== 3 && strncmp (str
, "tls", 3) == 0)
827 #ifdef md_elf_section_word
829 int md_attr
= md_elf_section_word (str
, len
);
835 ret
= obj_elf_section_type (str
, len
, FALSE
);
839 as_warn (_("unrecognized section attribute"));
844 /* Get name of section. */
846 obj_elf_section_name (void)
851 if (*input_line_pointer
== '"')
855 name
= demand_copy_C_string (&dummy
);
858 ignore_rest_of_line ();
864 char *end
= input_line_pointer
;
866 while (0 == strchr ("\n\t,; ", *end
))
868 if (end
== input_line_pointer
)
870 as_bad (_("missing name"));
871 ignore_rest_of_line ();
875 name
= xmalloc (end
- input_line_pointer
+ 1);
876 memcpy (name
, input_line_pointer
, end
- input_line_pointer
);
877 name
[end
- input_line_pointer
] = '\0';
878 #ifdef tc_canonicalize_section_name
879 name
= tc_canonicalize_section_name (name
);
881 input_line_pointer
= end
;
888 obj_elf_section (int push
)
890 char *name
, *group_name
, *beg
;
891 int type
, attr
, dummy
;
894 subsegT new_subsection
= -1;
901 #ifdef md_flush_pending_output
902 md_flush_pending_output ();
905 previous_section
= now_seg
;
906 previous_subsection
= now_subseg
;
908 s_mri_sect (&mri_type
);
910 #ifdef md_elf_section_change_hook
911 md_elf_section_change_hook ();
916 #endif /* ! defined (TC_I370) */
918 name
= obj_elf_section_name ();
927 if (*input_line_pointer
== ',')
929 /* Skip the comma. */
930 ++input_line_pointer
;
933 if (push
&& ISDIGIT (*input_line_pointer
))
935 /* .pushsection has an optional subsection. */
936 new_subsection
= (subsegT
) get_absolute_expression ();
940 /* Stop if we don't see a comma. */
941 if (*input_line_pointer
!= ',')
944 /* Skip the comma. */
945 ++input_line_pointer
;
949 if (*input_line_pointer
== '"')
951 beg
= demand_copy_C_string (&dummy
);
954 ignore_rest_of_line ();
957 attr
|= obj_elf_parse_section_letters (beg
, strlen (beg
));
960 if (*input_line_pointer
== ',')
963 char *save
= input_line_pointer
;
965 ++input_line_pointer
;
967 c
= *input_line_pointer
;
970 beg
= demand_copy_C_string (&dummy
);
973 ignore_rest_of_line ();
976 type
= obj_elf_section_type (beg
, strlen (beg
), TRUE
);
978 else if (c
== '@' || c
== '%')
980 beg
= ++input_line_pointer
;
981 c
= get_symbol_end ();
982 *input_line_pointer
= c
;
983 type
= obj_elf_section_type (beg
, input_line_pointer
- beg
, TRUE
);
986 input_line_pointer
= save
;
990 if ((attr
& SHF_MERGE
) != 0 && *input_line_pointer
== ',')
992 ++input_line_pointer
;
994 entsize
= get_absolute_expression ();
998 as_warn (_("invalid merge entity size"));
1003 else if ((attr
& SHF_MERGE
) != 0)
1005 as_warn (_("entity size for SHF_MERGE not specified"));
1009 if ((attr
& SHF_GROUP
) != 0 && *input_line_pointer
== ',')
1011 ++input_line_pointer
;
1012 group_name
= obj_elf_section_name ();
1013 if (group_name
== NULL
)
1015 else if (strncmp (input_line_pointer
, ",comdat", 7) == 0)
1017 input_line_pointer
+= 7;
1020 else if (strncmp (name
, ".gnu.linkonce", 13) == 0)
1023 else if ((attr
& SHF_GROUP
) != 0)
1025 as_warn (_("group name for SHF_GROUP not specified"));
1036 if (*input_line_pointer
!= '#')
1038 as_bad (_("character following name is not '#'"));
1039 ignore_rest_of_line ();
1042 beg
= ++input_line_pointer
;
1043 c
= get_symbol_end ();
1044 *input_line_pointer
= c
;
1046 attr
|= obj_elf_section_word (beg
, input_line_pointer
- beg
, & type
);
1050 while (*input_line_pointer
++ == ',');
1051 --input_line_pointer
;
1056 demand_empty_rest_of_line ();
1058 obj_elf_change_section (name
, type
, attr
, entsize
, group_name
, linkonce
, push
);
1060 if (push
&& new_subsection
!= -1)
1061 subseg_set (now_seg
, new_subsection
);
1064 /* Change to the .data section. */
1067 obj_elf_data (int i
)
1069 #ifdef md_flush_pending_output
1070 md_flush_pending_output ();
1073 previous_section
= now_seg
;
1074 previous_subsection
= now_subseg
;
1077 #ifdef md_elf_section_change_hook
1078 md_elf_section_change_hook ();
1082 /* Change to the .text section. */
1085 obj_elf_text (int i
)
1087 #ifdef md_flush_pending_output
1088 md_flush_pending_output ();
1091 previous_section
= now_seg
;
1092 previous_subsection
= now_subseg
;
1095 #ifdef md_elf_section_change_hook
1096 md_elf_section_change_hook ();
1100 /* Change to the *ABS* section. */
1103 obj_elf_struct (int i
)
1105 #ifdef md_flush_pending_output
1106 md_flush_pending_output ();
1109 previous_section
= now_seg
;
1110 previous_subsection
= now_subseg
;
1113 #ifdef md_elf_section_change_hook
1114 md_elf_section_change_hook ();
1119 obj_elf_subsection (int ignore ATTRIBUTE_UNUSED
)
1123 #ifdef md_flush_pending_output
1124 md_flush_pending_output ();
1127 previous_section
= now_seg
;
1128 previous_subsection
= now_subseg
;
1130 temp
= get_absolute_expression ();
1131 subseg_set (now_seg
, (subsegT
) temp
);
1132 demand_empty_rest_of_line ();
1134 #ifdef md_elf_section_change_hook
1135 md_elf_section_change_hook ();
1139 /* This can be called from the processor backends if they change
1143 obj_elf_section_change_hook (void)
1145 previous_section
= now_seg
;
1146 previous_subsection
= now_subseg
;
1150 obj_elf_previous (int ignore ATTRIBUTE_UNUSED
)
1155 if (previous_section
== 0)
1157 as_warn (_(".previous without corresponding .section; ignored"));
1161 #ifdef md_flush_pending_output
1162 md_flush_pending_output ();
1165 new_section
= previous_section
;
1166 new_subsection
= previous_subsection
;
1167 previous_section
= now_seg
;
1168 previous_subsection
= now_subseg
;
1169 subseg_set (new_section
, new_subsection
);
1171 #ifdef md_elf_section_change_hook
1172 md_elf_section_change_hook ();
1177 obj_elf_popsection (int xxx ATTRIBUTE_UNUSED
)
1179 struct section_stack
*top
= section_stack
;
1183 as_warn (_(".popsection without corresponding .pushsection; ignored"));
1187 #ifdef md_flush_pending_output
1188 md_flush_pending_output ();
1191 section_stack
= top
->next
;
1192 previous_section
= top
->prev_seg
;
1193 previous_subsection
= top
->prev_subseg
;
1194 subseg_set (top
->seg
, top
->subseg
);
1197 #ifdef md_elf_section_change_hook
1198 md_elf_section_change_hook ();
1203 obj_elf_line (int ignore ATTRIBUTE_UNUSED
)
1205 /* Assume delimiter is part of expression. BSD4.2 as fails with
1206 delightful bug, so we are not being incompatible here. */
1207 new_logical_line (NULL
, get_absolute_expression ());
1208 demand_empty_rest_of_line ();
1211 /* This handles the .symver pseudo-op, which is used to specify a
1212 symbol version. The syntax is ``.symver NAME,SYMVERNAME''.
1213 SYMVERNAME may contain ELF_VER_CHR ('@') characters. This
1214 pseudo-op causes the assembler to emit a symbol named SYMVERNAME
1215 with the same value as the symbol NAME. */
1218 obj_elf_symver (int ignore ATTRIBUTE_UNUSED
)
1225 name
= input_line_pointer
;
1226 c
= get_symbol_end ();
1228 sym
= symbol_find_or_make (name
);
1230 *input_line_pointer
= c
;
1233 if (*input_line_pointer
!= ',')
1235 as_bad (_("expected comma after name in .symver"));
1236 ignore_rest_of_line ();
1240 ++input_line_pointer
;
1242 name
= input_line_pointer
;
1244 /* Temporarily include '@' in symbol names. */
1245 old_lexat
= lex_type
[(unsigned char) '@'];
1246 lex_type
[(unsigned char) '@'] |= LEX_NAME
;
1247 c
= get_symbol_end ();
1248 lex_type
[(unsigned char) '@'] = old_lexat
;
1250 if (symbol_get_obj (sym
)->versioned_name
== NULL
)
1252 symbol_get_obj (sym
)->versioned_name
= xstrdup (name
);
1254 *input_line_pointer
= c
;
1256 if (strchr (symbol_get_obj (sym
)->versioned_name
,
1257 ELF_VER_CHR
) == NULL
)
1259 as_bad (_("missing version name in `%s' for symbol `%s'"),
1260 symbol_get_obj (sym
)->versioned_name
,
1262 ignore_rest_of_line ();
1268 if (strcmp (symbol_get_obj (sym
)->versioned_name
, name
))
1270 as_bad (_("multiple versions [`%s'|`%s'] for symbol `%s'"),
1271 name
, symbol_get_obj (sym
)->versioned_name
,
1273 ignore_rest_of_line ();
1277 *input_line_pointer
= c
;
1280 demand_empty_rest_of_line ();
1283 /* This handles the .vtable_inherit pseudo-op, which is used to indicate
1284 to the linker the hierarchy in which a particular table resides. The
1285 syntax is ".vtable_inherit CHILDNAME, PARENTNAME". */
1288 obj_elf_vtable_inherit (int ignore ATTRIBUTE_UNUSED
)
1290 char *cname
, *pname
;
1291 symbolS
*csym
, *psym
;
1294 if (*input_line_pointer
== '#')
1295 ++input_line_pointer
;
1297 cname
= input_line_pointer
;
1298 c
= get_symbol_end ();
1299 csym
= symbol_find (cname
);
1301 /* GCFIXME: should check that we don't have two .vtable_inherits for
1302 the same child symbol. Also, we can currently only do this if the
1303 child symbol is already exists and is placed in a fragment. */
1305 if (csym
== NULL
|| symbol_get_frag (csym
) == NULL
)
1307 as_bad (_("expected `%s' to have already been set for .vtable_inherit"),
1312 *input_line_pointer
= c
;
1315 if (*input_line_pointer
!= ',')
1317 as_bad (_("expected comma after name in .vtable_inherit"));
1318 ignore_rest_of_line ();
1322 ++input_line_pointer
;
1325 if (*input_line_pointer
== '#')
1326 ++input_line_pointer
;
1328 if (input_line_pointer
[0] == '0'
1329 && (input_line_pointer
[1] == '\0'
1330 || ISSPACE (input_line_pointer
[1])))
1332 psym
= section_symbol (absolute_section
);
1333 ++input_line_pointer
;
1337 pname
= input_line_pointer
;
1338 c
= get_symbol_end ();
1339 psym
= symbol_find_or_make (pname
);
1340 *input_line_pointer
= c
;
1343 demand_empty_rest_of_line ();
1348 assert (symbol_get_value_expression (csym
)->X_op
== O_constant
);
1349 return fix_new (symbol_get_frag (csym
),
1350 symbol_get_value_expression (csym
)->X_add_number
,
1351 0, psym
, 0, 0, BFD_RELOC_VTABLE_INHERIT
);
1354 /* This handles the .vtable_entry pseudo-op, which is used to indicate
1355 to the linker that a vtable slot was used. The syntax is
1356 ".vtable_entry tablename, offset". */
1359 obj_elf_vtable_entry (int ignore ATTRIBUTE_UNUSED
)
1366 if (*input_line_pointer
== '#')
1367 ++input_line_pointer
;
1369 name
= input_line_pointer
;
1370 c
= get_symbol_end ();
1371 sym
= symbol_find_or_make (name
);
1372 *input_line_pointer
= c
;
1375 if (*input_line_pointer
!= ',')
1377 as_bad (_("expected comma after name in .vtable_entry"));
1378 ignore_rest_of_line ();
1382 ++input_line_pointer
;
1383 if (*input_line_pointer
== '#')
1384 ++input_line_pointer
;
1386 offset
= get_absolute_expression ();
1388 demand_empty_rest_of_line ();
1390 return fix_new (frag_now
, frag_now_fix (), 0, sym
, offset
, 0,
1391 BFD_RELOC_VTABLE_ENTRY
);
1395 elf_obj_read_begin_hook (void)
1397 #ifdef NEED_ECOFF_DEBUG
1398 if (ECOFF_DEBUGGING
)
1399 ecoff_read_begin_hook ();
1404 elf_obj_symbol_new_hook (symbolS
*symbolP
)
1406 struct elf_obj_sy
*sy_obj
;
1408 sy_obj
= symbol_get_obj (symbolP
);
1409 sy_obj
->size
= NULL
;
1410 sy_obj
->versioned_name
= NULL
;
1412 #ifdef NEED_ECOFF_DEBUG
1413 if (ECOFF_DEBUGGING
)
1414 ecoff_symbol_new_hook (symbolP
);
1418 /* When setting one symbol equal to another, by default we probably
1419 want them to have the same "size", whatever it means in the current
1423 elf_copy_symbol_attributes (symbolS
*dest
, symbolS
*src
)
1425 struct elf_obj_sy
*srcelf
= symbol_get_obj (src
);
1426 struct elf_obj_sy
*destelf
= symbol_get_obj (dest
);
1429 if (destelf
->size
== NULL
)
1430 destelf
->size
= xmalloc (sizeof (expressionS
));
1431 *destelf
->size
= *srcelf
->size
;
1435 if (destelf
->size
!= NULL
)
1436 free (destelf
->size
);
1437 destelf
->size
= NULL
;
1439 S_SET_SIZE (dest
, S_GET_SIZE (src
));
1440 /* Don't copy visibility. */
1441 S_SET_OTHER (dest
, (ELF_ST_VISIBILITY (S_GET_OTHER (dest
))
1442 | (S_GET_OTHER (src
) & ~ELF_ST_VISIBILITY (-1))));
1446 obj_elf_version (int ignore ATTRIBUTE_UNUSED
)
1451 asection
*seg
= now_seg
;
1452 subsegT subseg
= now_subseg
;
1453 Elf_Internal_Note i_note
;
1454 Elf_External_Note e_note
;
1455 asection
*note_secp
= NULL
;
1458 if (*input_line_pointer
== '\"')
1462 ++input_line_pointer
; /* -> 1st char of string. */
1463 name
= input_line_pointer
;
1465 while (is_a_char (c
= next_char_of_string ()))
1467 c
= *input_line_pointer
;
1468 *input_line_pointer
= '\0';
1469 *(input_line_pointer
- 1) = '\0';
1470 *input_line_pointer
= c
;
1472 /* Create the .note section. */
1473 note_secp
= subseg_new (".note", 0);
1474 bfd_set_section_flags (stdoutput
,
1476 SEC_HAS_CONTENTS
| SEC_READONLY
);
1478 /* Process the version string. */
1479 len
= strlen (name
) + 1;
1481 /* PR 3456: Although the name field is padded out to an 4-byte
1482 boundary, the namesz field should not be adjusted. */
1483 i_note
.namesz
= len
;
1484 i_note
.descsz
= 0; /* No description. */
1485 i_note
.type
= NT_VERSION
;
1486 p
= frag_more (sizeof (e_note
.namesz
));
1487 md_number_to_chars (p
, i_note
.namesz
, sizeof (e_note
.namesz
));
1488 p
= frag_more (sizeof (e_note
.descsz
));
1489 md_number_to_chars (p
, i_note
.descsz
, sizeof (e_note
.descsz
));
1490 p
= frag_more (sizeof (e_note
.type
));
1491 md_number_to_chars (p
, i_note
.type
, sizeof (e_note
.type
));
1492 p
= frag_more (len
);
1493 memcpy (p
, name
, len
);
1495 frag_align (2, 0, 0);
1497 subseg_set (seg
, subseg
);
1500 as_bad (_("expected quoted string"));
1502 demand_empty_rest_of_line ();
1506 obj_elf_size (int ignore ATTRIBUTE_UNUSED
)
1508 char *name
= input_line_pointer
;
1509 char c
= get_symbol_end ();
1514 p
= input_line_pointer
;
1517 if (*input_line_pointer
!= ',')
1520 as_bad (_("expected comma after name `%s' in .size directive"), name
);
1522 ignore_rest_of_line ();
1525 input_line_pointer
++;
1527 if (exp
.X_op
== O_absent
)
1529 as_bad (_("missing expression in .size directive"));
1530 exp
.X_op
= O_constant
;
1531 exp
.X_add_number
= 0;
1534 sym
= symbol_find_or_make (name
);
1536 if (exp
.X_op
== O_constant
)
1538 S_SET_SIZE (sym
, exp
.X_add_number
);
1539 if (symbol_get_obj (sym
)->size
)
1541 xfree (symbol_get_obj (sym
)->size
);
1542 symbol_get_obj (sym
)->size
= NULL
;
1547 symbol_get_obj (sym
)->size
= xmalloc (sizeof (expressionS
));
1548 *symbol_get_obj (sym
)->size
= exp
;
1550 demand_empty_rest_of_line ();
1553 /* Handle the ELF .type pseudo-op. This sets the type of a symbol.
1554 There are six syntaxes:
1556 The first (used on Solaris) is
1558 The second (used on UnixWare) is
1560 The third (reportedly to be used on Irix 6.0) is
1562 The fourth (used on NetBSD/Arm and Linux/ARM) is
1564 The fifth (used on SVR4/860) is
1565 .type SYM,"function"
1566 The sixth (emitted by recent SunPRO under Solaris) is
1568 where the integer is the STT_* value.
1572 obj_elf_type_name (char *cp
)
1576 p
= input_line_pointer
;
1577 if (*input_line_pointer
>= '0'
1578 && *input_line_pointer
<= '9')
1580 while (*input_line_pointer
>= '0'
1581 && *input_line_pointer
<= '9')
1582 ++input_line_pointer
;
1583 *cp
= *input_line_pointer
;
1584 *input_line_pointer
= '\0';
1587 *cp
= get_symbol_end ();
1593 obj_elf_type (int ignore ATTRIBUTE_UNUSED
)
1598 const char *typename
;
1600 elf_symbol_type
*elfsym
;
1602 name
= input_line_pointer
;
1603 c
= get_symbol_end ();
1604 sym
= symbol_find_or_make (name
);
1605 elfsym
= (elf_symbol_type
*) symbol_get_bfdsym (sym
);
1606 *input_line_pointer
= c
;
1609 if (*input_line_pointer
== ',')
1610 ++input_line_pointer
;
1613 if ( *input_line_pointer
== '#'
1614 || *input_line_pointer
== '@'
1615 || *input_line_pointer
== '"'
1616 || *input_line_pointer
== '%')
1617 ++input_line_pointer
;
1619 typename
= obj_elf_type_name (& c
);
1622 if (strcmp (typename
, "function") == 0
1623 || strcmp (typename
, "2") == 0
1624 || strcmp (typename
, "STT_FUNC") == 0)
1625 type
= BSF_FUNCTION
;
1626 else if (strcmp (typename
, "object") == 0
1627 || strcmp (typename
, "1") == 0
1628 || strcmp (typename
, "STT_OBJECT") == 0)
1630 else if (strcmp (typename
, "tls_object") == 0
1631 || strcmp (typename
, "6") == 0
1632 || strcmp (typename
, "STT_TLS") == 0)
1633 type
= BSF_OBJECT
| BSF_THREAD_LOCAL
;
1634 else if (strcmp (typename
, "notype") == 0
1635 || strcmp (typename
, "0") == 0
1636 || strcmp (typename
, "STT_NOTYPE") == 0)
1638 else if (strcmp (typename
, "common") == 0
1639 || strcmp (typename
, "5") == 0
1640 || strcmp (typename
, "STT_COMMON") == 0)
1644 if (! S_IS_COMMON (sym
))
1646 if (S_IS_VOLATILE (sym
))
1648 sym
= symbol_clone (sym
, 1);
1649 S_SET_SEGMENT (sym
, bfd_com_section_ptr
);
1650 S_SET_VALUE (sym
, 0);
1651 S_SET_EXTERNAL (sym
);
1652 symbol_set_frag (sym
, &zero_address_frag
);
1653 S_CLEAR_VOLATILE (sym
);
1655 else if (S_IS_DEFINED (sym
) || symbol_equated_p (sym
))
1656 as_bad (_("symbol '%s' is already defined"), S_GET_NAME (sym
));
1659 /* FIXME: Is it safe to just change the section ? */
1660 S_SET_SEGMENT (sym
, bfd_com_section_ptr
);
1661 S_SET_VALUE (sym
, 0);
1662 S_SET_EXTERNAL (sym
);
1666 else if (strcmp (typename
, "indirect_function") == 0
1667 || strcmp (typename
, "10") == 0
1668 || strcmp (typename
, "STT_IFUNC") == 0)
1670 const struct elf_backend_data
*bed
;
1672 bed
= get_elf_backend_data (stdoutput
);
1673 if (!(bed
->elf_osabi
== ELFOSABI_LINUX
1674 /* GNU/Linux is still using the default value 0. */
1675 || bed
->elf_osabi
== ELFOSABI_NONE
))
1676 as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
1678 type
= BSF_FUNCTION
| BSF_INDIRECT_FUNCTION
;
1680 #ifdef md_elf_symbol_type
1681 else if ((type
= md_elf_symbol_type (typename
, sym
, elfsym
)) != -1)
1685 as_bad (_("unrecognized symbol type \"%s\""), typename
);
1687 *input_line_pointer
= c
;
1689 if (*input_line_pointer
== '"')
1690 ++input_line_pointer
;
1692 elfsym
->symbol
.flags
|= type
;
1694 demand_empty_rest_of_line ();
1698 obj_elf_ident (int ignore ATTRIBUTE_UNUSED
)
1700 static segT comment_section
;
1701 segT old_section
= now_seg
;
1702 int old_subsection
= now_subseg
;
1704 #ifdef md_flush_pending_output
1705 md_flush_pending_output ();
1708 if (!comment_section
)
1711 comment_section
= subseg_new (".comment", 0);
1712 bfd_set_section_flags (stdoutput
, comment_section
,
1713 SEC_READONLY
| SEC_HAS_CONTENTS
);
1718 subseg_set (comment_section
, 0);
1720 subseg_set (old_section
, old_subsection
);
1723 #ifdef INIT_STAB_SECTION
1725 /* The first entry in a .stabs section is special. */
1728 obj_elf_init_stab_section (segT seg
)
1733 unsigned int stroff
;
1735 /* Force the section to align to a longword boundary. Without this,
1736 UnixWare ar crashes. */
1737 bfd_set_section_alignment (stdoutput
, seg
, 2);
1739 /* Make space for this first symbol. */
1743 as_where (&file
, NULL
);
1744 stabstr_name
= xmalloc (strlen (segment_name (seg
)) + 4);
1745 strcpy (stabstr_name
, segment_name (seg
));
1746 strcat (stabstr_name
, "str");
1747 stroff
= get_stab_string_offset (file
, stabstr_name
);
1749 md_number_to_chars (p
, stroff
, 4);
1750 seg_info (seg
)->stabu
.p
= p
;
1755 /* Fill in the counts in the first entry in a .stabs section. */
1758 adjust_stab_sections (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1765 if (strncmp (".stab", sec
->name
, 5))
1767 if (!strcmp ("str", sec
->name
+ strlen (sec
->name
) - 3))
1770 name
= alloca (strlen (sec
->name
) + 4);
1771 strcpy (name
, sec
->name
);
1772 strcat (name
, "str");
1773 strsec
= bfd_get_section_by_name (abfd
, name
);
1775 strsz
= bfd_section_size (abfd
, strsec
);
1778 nsyms
= bfd_section_size (abfd
, sec
) / 12 - 1;
1780 p
= seg_info (sec
)->stabu
.p
;
1783 bfd_h_put_16 (abfd
, nsyms
, p
+ 6);
1784 bfd_h_put_32 (abfd
, strsz
, p
+ 8);
1787 #ifdef NEED_ECOFF_DEBUG
1789 /* This function is called by the ECOFF code. It is supposed to
1790 record the external symbol information so that the backend can
1791 write it out correctly. The ELF backend doesn't actually handle
1792 this at the moment, so we do it ourselves. We save the information
1795 #ifdef OBJ_MAYBE_ELF
1799 elf_ecoff_set_ext (symbolS
*sym
, struct ecoff_extr
*ext
)
1801 symbol_get_bfdsym (sym
)->udata
.p
= ext
;
1804 /* This function is called by bfd_ecoff_debug_externals. It is
1805 supposed to *EXT to the external symbol information, and return
1806 whether the symbol should be used at all. */
1809 elf_get_extr (asymbol
*sym
, EXTR
*ext
)
1811 if (sym
->udata
.p
== NULL
)
1813 *ext
= *(EXTR
*) sym
->udata
.p
;
1817 /* This function is called by bfd_ecoff_debug_externals. It has
1818 nothing to do for ELF. */
1821 elf_set_index (asymbol
*sym ATTRIBUTE_UNUSED
,
1822 bfd_size_type indx ATTRIBUTE_UNUSED
)
1826 #endif /* NEED_ECOFF_DEBUG */
1829 elf_frob_symbol (symbolS
*symp
, int *puntp
)
1831 struct elf_obj_sy
*sy_obj
;
1833 #ifdef NEED_ECOFF_DEBUG
1834 if (ECOFF_DEBUGGING
)
1835 ecoff_frob_symbol (symp
);
1838 sy_obj
= symbol_get_obj (symp
);
1840 if (sy_obj
->size
!= NULL
)
1842 switch (sy_obj
->size
->X_op
)
1846 (S_GET_VALUE (sy_obj
->size
->X_add_symbol
)
1847 + sy_obj
->size
->X_add_number
1848 - S_GET_VALUE (sy_obj
->size
->X_op_symbol
)));
1852 (S_GET_VALUE (sy_obj
->size
->X_add_symbol
)
1853 + sy_obj
->size
->X_add_number
));
1856 as_bad (_(".size expression too complicated to fix up"));
1859 free (sy_obj
->size
);
1860 sy_obj
->size
= NULL
;
1863 if (sy_obj
->versioned_name
!= NULL
)
1867 p
= strchr (sy_obj
->versioned_name
, ELF_VER_CHR
);
1870 /* This symbol was given a new name with the .symver directive.
1872 If this is an external reference, just rename the symbol to
1873 include the version string. This will make the relocs be
1874 against the correct versioned symbol.
1876 If this is a definition, add an alias. FIXME: Using an alias
1877 will permit the debugging information to refer to the right
1878 symbol. However, it's not clear whether it is the best
1881 if (! S_IS_DEFINED (symp
))
1883 /* Verify that the name isn't using the @@ syntax--this is
1884 reserved for definitions of the default version to link
1886 if (p
[1] == ELF_VER_CHR
)
1888 as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"),
1889 sy_obj
->versioned_name
);
1892 S_SET_NAME (symp
, sy_obj
->versioned_name
);
1896 if (p
[1] == ELF_VER_CHR
&& p
[2] == ELF_VER_CHR
)
1900 /* The @@@ syntax is a special case. It renames the
1901 symbol name to versioned_name with one `@' removed. */
1902 l
= strlen (&p
[3]) + 1;
1903 memmove (&p
[2], &p
[3], l
);
1904 S_SET_NAME (symp
, sy_obj
->versioned_name
);
1910 /* FIXME: Creating a new symbol here is risky. We're
1911 in the final loop over the symbol table. We can
1912 get away with it only because the symbol goes to
1913 the end of the list, where the loop will still see
1914 it. It would probably be better to do this in
1915 obj_frob_file_before_adjust. */
1917 symp2
= symbol_find_or_make (sy_obj
->versioned_name
);
1919 /* Now we act as though we saw symp2 = sym. */
1921 S_SET_SEGMENT (symp2
, S_GET_SEGMENT (symp
));
1923 /* Subtracting out the frag address here is a hack
1924 because we are in the middle of the final loop. */
1927 - symbol_get_frag (symp
)->fr_address
));
1929 symbol_set_frag (symp2
, symbol_get_frag (symp
));
1931 /* This will copy over the size information. */
1932 copy_symbol_attributes (symp2
, symp
);
1934 S_SET_OTHER (symp2
, S_GET_OTHER (symp
));
1936 if (S_IS_WEAK (symp
))
1939 if (S_IS_EXTERNAL (symp
))
1940 S_SET_EXTERNAL (symp2
);
1945 /* Double check weak symbols. */
1946 if (S_IS_WEAK (symp
))
1948 if (S_IS_COMMON (symp
))
1949 as_bad (_("symbol `%s' can not be both weak and common"),
1954 /* The Irix 5 and 6 assemblers set the type of any common symbol and
1955 any undefined non-function symbol to STT_OBJECT. We try to be
1956 compatible, since newer Irix 5 and 6 linkers care. However, we
1957 only set undefined symbols to be STT_OBJECT if we are on Irix,
1958 because that is the only time gcc will generate the necessary
1959 .global directives to mark functions. */
1961 if (S_IS_COMMON (symp
))
1962 symbol_get_bfdsym (symp
)->flags
|= BSF_OBJECT
;
1964 if (strstr (TARGET_OS
, "irix") != NULL
1965 && ! S_IS_DEFINED (symp
)
1966 && (symbol_get_bfdsym (symp
)->flags
& BSF_FUNCTION
) == 0)
1967 symbol_get_bfdsym (symp
)->flags
|= BSF_OBJECT
;
1973 asection
**head
; /* Section lists. */
1974 unsigned int *elt_count
; /* Number of sections in each list. */
1975 unsigned int num_group
; /* Number of lists. */
1978 /* Called via bfd_map_over_sections. If SEC is a member of a group,
1979 add it to a list of sections belonging to the group. INF is a
1980 pointer to a struct group_list, which is where we store the head of
1984 build_group_lists (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
1986 struct group_list
*list
= inf
;
1987 const char *group_name
= elf_group_name (sec
);
1990 if (group_name
== NULL
)
1993 /* If this group already has a list, add the section to the head of
1995 for (i
= 0; i
< list
->num_group
; i
++)
1997 if (strcmp (group_name
, elf_group_name (list
->head
[i
])) == 0)
1999 elf_next_in_group (sec
) = list
->head
[i
];
2000 list
->head
[i
] = sec
;
2001 list
->elt_count
[i
] += 1;
2006 /* New group. Make the arrays bigger in chunks to minimize calls to
2008 i
= list
->num_group
;
2011 unsigned int newsize
= i
+ 128;
2012 list
->head
= xrealloc (list
->head
, newsize
* sizeof (*list
->head
));
2013 list
->elt_count
= xrealloc (list
->elt_count
,
2014 newsize
* sizeof (*list
->elt_count
));
2016 list
->head
[i
] = sec
;
2017 list
->elt_count
[i
] = 1;
2018 list
->num_group
+= 1;
2022 elf_frob_file (void)
2024 struct group_list list
;
2027 bfd_map_over_sections (stdoutput
, adjust_stab_sections
, NULL
);
2029 /* Go find section groups. */
2032 list
.elt_count
= NULL
;
2033 bfd_map_over_sections (stdoutput
, build_group_lists
, &list
);
2035 /* Make the SHT_GROUP sections that describe each section group. We
2036 can't set up the section contents here yet, because elf section
2037 indices have yet to be calculated. elf.c:set_group_contents does
2038 the rest of the work. */
2039 for (i
= 0; i
< list
.num_group
; i
++)
2041 const char *group_name
= elf_group_name (list
.head
[i
]);
2042 const char *sec_name
;
2049 flags
= SEC_READONLY
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_GROUP
;
2050 for (s
= list
.head
[i
]; s
!= NULL
; s
= elf_next_in_group (s
))
2051 if ((s
->flags
^ flags
) & SEC_LINK_ONCE
)
2053 flags
|= SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_DISCARD
;
2054 if (s
!= list
.head
[i
])
2056 as_warn (_("assuming all members of group `%s' are COMDAT"),
2062 sec_name
= group_name
;
2063 sy
= symbol_find_exact (group_name
);
2066 && (sy
== symbol_lastP
2067 || (sy
->sy_next
!= NULL
2068 && sy
->sy_next
->sy_previous
== sy
)))
2071 sec_name
= ".group";
2073 s
= subseg_force_new (sec_name
, 0);
2075 || !bfd_set_section_flags (stdoutput
, s
, flags
)
2076 || !bfd_set_section_alignment (stdoutput
, s
, 2))
2078 as_fatal (_("can't create group: %s"),
2079 bfd_errmsg (bfd_get_error ()));
2081 elf_section_type (s
) = SHT_GROUP
;
2083 /* Pass a pointer to the first section in this group. */
2084 elf_next_in_group (s
) = list
.head
[i
];
2086 elf_group_id (s
) = sy
->bsym
;
2088 size
= 4 * (list
.elt_count
[i
] + 1);
2089 bfd_set_section_size (stdoutput
, s
, size
);
2090 s
->contents
= (unsigned char *) frag_more (size
);
2091 frag_now
->fr_fix
= frag_now_fix_octets ();
2092 frag_wane (frag_now
);
2095 #ifdef elf_tc_final_processing
2096 elf_tc_final_processing ();
2100 /* It removes any unneeded versioned symbols from the symbol table. */
2103 elf_frob_file_before_adjust (void)
2109 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
2110 if (!S_IS_DEFINED (symp
))
2112 if (symbol_get_obj (symp
)->versioned_name
)
2116 /* The @@@ syntax is a special case. If the symbol is
2117 not defined, 2 `@'s will be removed from the
2120 p
= strchr (symbol_get_obj (symp
)->versioned_name
,
2123 if (p
[1] == ELF_VER_CHR
&& p
[2] == ELF_VER_CHR
)
2125 size_t l
= strlen (&p
[3]) + 1;
2126 memmove (&p
[1], &p
[3], l
);
2128 if (symbol_used_p (symp
) == 0
2129 && symbol_used_in_reloc_p (symp
) == 0)
2130 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2133 /* If there was .weak foo, but foo was neither defined nor
2134 used anywhere, remove it. */
2136 else if (S_IS_WEAK (symp
)
2137 && symbol_used_p (symp
) == 0
2138 && symbol_used_in_reloc_p (symp
) == 0)
2139 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2144 /* It is required that we let write_relocs have the opportunity to
2145 optimize away fixups before output has begun, since it is possible
2146 to eliminate all fixups for a section and thus we never should
2147 have generated the relocation section. */
2150 elf_frob_file_after_relocs (void)
2152 #ifdef NEED_ECOFF_DEBUG
2153 if (ECOFF_DEBUGGING
)
2154 /* Generate the ECOFF debugging information. */
2156 const struct ecoff_debug_swap
*debug_swap
;
2157 struct ecoff_debug_info debug
;
2162 = get_elf_backend_data (stdoutput
)->elf_backend_ecoff_debug_swap
;
2163 know (debug_swap
!= NULL
);
2164 ecoff_build_debug (&debug
.symbolic_header
, &buf
, debug_swap
);
2166 /* Set up the pointers in debug. */
2167 #define SET(ptr, offset, type) \
2168 debug.ptr = (type) (buf + debug.symbolic_header.offset)
2170 SET (line
, cbLineOffset
, unsigned char *);
2171 SET (external_dnr
, cbDnOffset
, void *);
2172 SET (external_pdr
, cbPdOffset
, void *);
2173 SET (external_sym
, cbSymOffset
, void *);
2174 SET (external_opt
, cbOptOffset
, void *);
2175 SET (external_aux
, cbAuxOffset
, union aux_ext
*);
2176 SET (ss
, cbSsOffset
, char *);
2177 SET (external_fdr
, cbFdOffset
, void *);
2178 SET (external_rfd
, cbRfdOffset
, void *);
2179 /* ssext and external_ext are set up just below. */
2183 /* Set up the external symbols. */
2184 debug
.ssext
= debug
.ssext_end
= NULL
;
2185 debug
.external_ext
= debug
.external_ext_end
= NULL
;
2186 if (! bfd_ecoff_debug_externals (stdoutput
, &debug
, debug_swap
, TRUE
,
2187 elf_get_extr
, elf_set_index
))
2188 as_fatal (_("failed to set up debugging information: %s"),
2189 bfd_errmsg (bfd_get_error ()));
2191 sec
= bfd_get_section_by_name (stdoutput
, ".mdebug");
2192 assert (sec
!= NULL
);
2194 know (!stdoutput
->output_has_begun
);
2196 /* We set the size of the section, call bfd_set_section_contents
2197 to force the ELF backend to allocate a file position, and then
2198 write out the data. FIXME: Is this really the best way to do
2200 bfd_set_section_size
2201 (stdoutput
, sec
, bfd_ecoff_debug_size (stdoutput
, &debug
, debug_swap
));
2203 /* Pass BUF to bfd_set_section_contents because this will
2204 eventually become a call to fwrite, and ISO C prohibits
2205 passing a NULL pointer to a stdio function even if the
2206 pointer will not be used. */
2207 if (! bfd_set_section_contents (stdoutput
, sec
, buf
, 0, 0))
2208 as_fatal (_("can't start writing .mdebug section: %s"),
2209 bfd_errmsg (bfd_get_error ()));
2211 know (stdoutput
->output_has_begun
);
2212 know (sec
->filepos
!= 0);
2214 if (! bfd_ecoff_write_debug (stdoutput
, &debug
, debug_swap
,
2216 as_fatal (_("could not write .mdebug section: %s"),
2217 bfd_errmsg (bfd_get_error ()));
2219 #endif /* NEED_ECOFF_DEBUG */
2224 /* Heavily plagiarized from obj_elf_version. The idea is to emit the
2225 SCO specific identifier in the .notes section to satisfy the SCO
2228 This looks more complicated than it really is. As opposed to the
2229 "obvious" solution, this should handle the cross dev cases
2230 correctly. (i.e, hosting on a 64 bit big endian processor, but
2231 generating SCO Elf code) Efficiency isn't a concern, as there
2232 should be exactly one of these sections per object module.
2234 SCO OpenServer 5 identifies it's ELF modules with a standard ELF
2237 int_32 namesz = 4 ; Name size
2238 int_32 descsz = 12 ; Descriptive information
2240 char name[4] = "SCO" ; Originator name ALWAYS SCO + NULL
2241 int_32 version = (major ver # << 16) | version of tools ;
2242 int_32 source = (tool_id << 16 ) | 1 ;
2243 int_32 info = 0 ; These are set by the SCO tools, but we
2244 don't know enough about the source
2245 environment to set them. SCO ld currently
2246 ignores them, and recommends we set them
2249 #define SCO_MAJOR_VERSION 0x1
2250 #define SCO_MINOR_VERSION 0x1
2260 asection
*seg
= now_seg
;
2261 subsegT subseg
= now_subseg
;
2262 Elf_Internal_Note i_note
;
2263 Elf_External_Note e_note
;
2264 asection
*note_secp
= NULL
;
2267 /* create the .note section */
2269 note_secp
= subseg_new (".note", 0);
2270 bfd_set_section_flags (stdoutput
,
2272 SEC_HAS_CONTENTS
| SEC_READONLY
);
2274 /* process the version string */
2277 i_note
.descsz
= 12; /* 12 descriptive bytes */
2278 i_note
.type
= NT_VERSION
; /* Contains a version string */
2280 p
= frag_more (sizeof (i_note
.namesz
));
2281 md_number_to_chars (p
, i_note
.namesz
, 4);
2283 p
= frag_more (sizeof (i_note
.descsz
));
2284 md_number_to_chars (p
, i_note
.descsz
, 4);
2286 p
= frag_more (sizeof (i_note
.type
));
2287 md_number_to_chars (p
, i_note
.type
, 4);
2292 /* Note: this is the version number of the ELF we're representing */
2294 md_number_to_chars (p
, (SCO_MAJOR_VERSION
<< 16) | (SCO_MINOR_VERSION
), 4);
2296 /* Here, we pick a magic number for ourselves (yes, I "registered"
2297 it with SCO. The bottom bit shows that we are compat with the
2300 md_number_to_chars (p
, 0x4c520000 | 0x0001, 4);
2302 /* If we knew (or cared) what the source language options were, we'd
2303 fill them in here. SCO has given us permission to ignore these
2304 and just set them to zero. */
2306 md_number_to_chars (p
, 0x0000, 4);
2308 frag_align (2, 0, 0);
2310 /* We probably can't restore the current segment, for there likely
2313 subseg_set (seg
, subseg
);
2317 #endif /* SCO_ELF */
2320 elf_separate_stab_sections (void)
2322 #ifdef NEED_ECOFF_DEBUG
2323 return (!ECOFF_DEBUGGING
);
2330 elf_init_stab_section (segT seg
)
2332 #ifdef NEED_ECOFF_DEBUG
2333 if (!ECOFF_DEBUGGING
)
2335 obj_elf_init_stab_section (seg
);
2338 const struct format_ops elf_format_ops
=
2340 bfd_target_elf_flavour
,
2341 0, /* dfl_leading_underscore */
2342 1, /* emit_section_symbols */
2347 elf_frob_file_before_adjust
,
2348 0, /* obj_frob_file_before_fix */
2349 elf_frob_file_after_relocs
,
2350 elf_s_get_size
, elf_s_set_size
,
2351 elf_s_get_align
, elf_s_set_align
,
2358 elf_copy_symbol_attributes
,
2359 #ifdef NEED_ECOFF_DEBUG
2360 ecoff_generate_asm_lineno
,
2363 0, /* generate_asm_lineno */
2364 0, /* process_stab */
2366 elf_separate_stab_sections
,
2367 elf_init_stab_section
,
2368 elf_sec_sym_ok_for_reloc
,
2370 #ifdef NEED_ECOFF_DEBUG
2373 0, /* ecoff_set_ext */
2375 elf_obj_read_begin_hook
,
2376 elf_obj_symbol_new_hook