9deaaaf1b3
* bfd.c (bfd_free_cached_info): Define. * bfd-in.h (JUMP_TABLE): Add _bfd_free_cached_info. * bfd-in2.h: Rebuilt. * All backends: Initialize bfd_free_cached_info entry point to bfd_true.
813 lines
20 KiB
C
813 lines
20 KiB
C
/* Generic BFD library interface and support routines.
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Copyright (C) 1990, 91, 92, 93, 94 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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SECTION
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<<typedef bfd>>
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A BFD has type <<bfd>>; objects of this type are the
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cornerstone of any application using BFD. Using BFD
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consists of making references though the BFD and to data in the BFD.
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Here is the structure that defines the type <<bfd>>. It
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contains the major data about the file and pointers
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to the rest of the data.
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CODE_FRAGMENT
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.
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.struct _bfd
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.{
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. {* The filename the application opened the BFD with. *}
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. CONST char *filename;
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.
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. {* A pointer to the target jump table. *}
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. struct bfd_target *xvec;
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.
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. {* To avoid dragging too many header files into every file that
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. includes `<<bfd.h>>', IOSTREAM has been declared as a "char
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. *", and MTIME as a "long". Their correct types, to which they
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. are cast when used, are "FILE *" and "time_t". The iostream
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. is the result of an fopen on the filename. *}
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. char *iostream;
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.
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. {* Is the file descriptor being cached? That is, can it be closed as
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. needed, and re-opened when accessed later? *}
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.
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. boolean cacheable;
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.
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. {* Marks whether there was a default target specified when the
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. BFD was opened. This is used to select which matching algorithm
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. to use to choose the back end. *}
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.
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. boolean target_defaulted;
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.
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. {* The caching routines use these to maintain a
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. least-recently-used list of BFDs *}
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.
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. struct _bfd *lru_prev, *lru_next;
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.
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. {* When a file is closed by the caching routines, BFD retains
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. state information on the file here: *}
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.
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. file_ptr where;
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.
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. {* and here: (``once'' means at least once) *}
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.
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. boolean opened_once;
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.
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. {* Set if we have a locally maintained mtime value, rather than
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. getting it from the file each time: *}
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.
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. boolean mtime_set;
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.
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. {* File modified time, if mtime_set is true: *}
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.
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. long mtime;
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.
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. {* Reserved for an unimplemented file locking extension.*}
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.
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. int ifd;
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.
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. {* The format which belongs to the BFD. (object, core, etc.) *}
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.
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. bfd_format format;
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.
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. {* The direction the BFD was opened with*}
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.
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. enum bfd_direction {no_direction = 0,
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. read_direction = 1,
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. write_direction = 2,
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. both_direction = 3} direction;
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.
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. {* Format_specific flags*}
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.
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. flagword flags;
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.
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. {* Currently my_archive is tested before adding origin to
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. anything. I believe that this can become always an add of
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. origin, with origin set to 0 for non archive files. *}
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.
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. file_ptr origin;
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.
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. {* Remember when output has begun, to stop strange things
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. from happening. *}
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. boolean output_has_begun;
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.
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. {* Pointer to linked list of sections*}
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. struct sec *sections;
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.
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. {* The number of sections *}
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. unsigned int section_count;
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.
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. {* Stuff only useful for object files:
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. The start address. *}
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. bfd_vma start_address;
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.
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. {* Used for input and output*}
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. unsigned int symcount;
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.
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. {* Symbol table for output BFD (with symcount entries) *}
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. struct symbol_cache_entry **outsymbols;
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.
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. {* Pointer to structure which contains architecture information*}
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. struct bfd_arch_info *arch_info;
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.
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. {* Stuff only useful for archives:*}
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. PTR arelt_data;
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. struct _bfd *my_archive; {* The containing archive BFD. *}
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. struct _bfd *next; {* The next BFD in the archive. *}
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. struct _bfd *archive_head; {* The first BFD in the archive. *}
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. boolean has_armap;
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.
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. {* A chain of BFD structures involved in a link. *}
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. struct _bfd *link_next;
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.
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. {* A field used by _bfd_generic_link_add_archive_symbols. This will
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. be used only for archive elements. *}
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. int archive_pass;
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.
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. {* Used by the back end to hold private data. *}
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.
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. union
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. {
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. struct aout_data_struct *aout_data;
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. struct artdata *aout_ar_data;
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. struct _oasys_data *oasys_obj_data;
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. struct _oasys_ar_data *oasys_ar_data;
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. struct coff_tdata *coff_obj_data;
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. struct ecoff_tdata *ecoff_obj_data;
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. struct ieee_data_struct *ieee_data;
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. struct ieee_ar_data_struct *ieee_ar_data;
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. struct srec_data_struct *srec_data;
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. struct tekhex_data_struct *tekhex_data;
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. struct elf_obj_tdata *elf_obj_data;
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. struct nlm_obj_tdata *nlm_obj_data;
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. struct bout_data_struct *bout_data;
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. struct sun_core_struct *sun_core_data;
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. struct trad_core_struct *trad_core_data;
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. struct som_data_struct *som_data;
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. struct hpux_core_struct *hpux_core_data;
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. struct hppabsd_core_struct *hppabsd_core_data;
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. struct sgi_core_struct *sgi_core_data;
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. struct lynx_core_struct *lynx_core_data;
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. struct osf_core_struct *osf_core_data;
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. struct cisco_core_struct *cisco_core_data;
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. PTR any;
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. } tdata;
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.
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. {* Used by the application to hold private data*}
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. PTR usrdata;
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.
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. {* Where all the allocated stuff under this BFD goes *}
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. struct obstack memory;
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.};
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.
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*/
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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#include "coff/internal.h"
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#include "coff/sym.h"
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#include "libcoff.h"
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#include "libecoff.h"
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#undef obj_symbols
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#include "libelf.h"
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/*
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SECTION
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Error reporting
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Most BFD functions return nonzero on success (check their
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individual documentation for precise semantics). On an error,
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they call <<bfd_set_error>> to set an error condition that callers
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can check by calling <<bfd_get_error>>.
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If that returns <<bfd_error_system_call>>, then check
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<<errno>>.
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The easiest way to report a BFD error to the user is to
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use <<bfd_perror>>.
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SUBSECTION
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Type <<bfd_error_type>>
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The values returned by <<bfd_get_error>> are defined by the
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enumerated type <<bfd_error_type>>.
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CODE_FRAGMENT
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.
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.typedef enum bfd_error
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.{
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. bfd_error_no_error = 0,
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. bfd_error_system_call,
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. bfd_error_invalid_target,
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. bfd_error_wrong_format,
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. bfd_error_invalid_operation,
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. bfd_error_no_memory,
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. bfd_error_no_symbols,
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. bfd_error_no_more_archived_files,
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. bfd_error_malformed_archive,
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. bfd_error_file_not_recognized,
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. bfd_error_file_ambiguously_recognized,
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. bfd_error_no_contents,
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. bfd_error_nonrepresentable_section,
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. bfd_error_no_debug_section,
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. bfd_error_bad_value,
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. bfd_error_file_truncated,
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. bfd_error_invalid_error_code
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.} bfd_error_type;
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.
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*/
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#undef strerror
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extern char *strerror();
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static bfd_error_type bfd_error = bfd_error_no_error;
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CONST char *CONST bfd_errmsgs[] = {
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"No error",
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"System call error",
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"Invalid bfd target",
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"File in wrong format",
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"Invalid operation",
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"Memory exhausted",
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"No symbols",
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"No more archived files",
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"Malformed archive",
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"File format not recognized",
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"File format is ambiguous",
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"Section has no contents",
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"Nonrepresentable section on output",
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"Symbol needs debug section which does not exist",
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"Bad value",
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"File truncated",
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"#<Invalid error code>"
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};
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/*
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FUNCTION
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bfd_get_error
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SYNOPSIS
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bfd_error_type bfd_get_error (void);
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DESCRIPTION
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Return the current BFD error condition.
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*/
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bfd_error_type
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bfd_get_error ()
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{
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return bfd_error;
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}
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/*
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FUNCTION
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bfd_set_error
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SYNOPSIS
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void bfd_set_error (bfd_error_type error_tag);
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DESCRIPTION
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Set the BFD error condition to be @var{error_tag}.
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*/
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void
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bfd_set_error (error_tag)
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bfd_error_type error_tag;
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{
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bfd_error = error_tag;
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}
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/*
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FUNCTION
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bfd_errmsg
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SYNOPSIS
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CONST char *bfd_errmsg (bfd_error_type error_tag);
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DESCRIPTION
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Return a string describing the error @var{error_tag}, or
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the system error if @var{error_tag} is <<bfd_error_system_call>>.
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*/
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CONST char *
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bfd_errmsg (error_tag)
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bfd_error_type error_tag;
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{
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#ifndef errno
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extern int errno;
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#endif
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if (error_tag == bfd_error_system_call)
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return strerror (errno);
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if ((((int)error_tag <(int) bfd_error_no_error) ||
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((int)error_tag > (int)bfd_error_invalid_error_code)))
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error_tag = bfd_error_invalid_error_code;/* sanity check */
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return bfd_errmsgs [(int)error_tag];
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}
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/*
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FUNCTION
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bfd_perror
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SYNOPSIS
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void bfd_perror (CONST char *message);
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DESCRIPTION
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Print to the standard error stream a string describing the
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last BFD error that occurred, or the last system error if
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the last BFD error was a system call failure. If @var{message}
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is non-NULL and non-empty, the error string printed is preceded
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by @var{message}, a colon, and a space. It is followed by a newline.
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*/
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void
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bfd_perror (message)
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CONST char *message;
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{
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if (bfd_get_error () == bfd_error_system_call)
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perror((char *)message); /* must be system error then... */
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else {
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if (message == NULL || *message == '\0')
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fprintf (stderr, "%s\n", bfd_errmsg (bfd_get_error ()));
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else
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fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_get_error ()));
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}
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}
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/*
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SECTION
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Symbols
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*/
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/*
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FUNCTION
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bfd_get_reloc_upper_bound
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SYNOPSIS
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long bfd_get_reloc_upper_bound(bfd *abfd, asection *sect);
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DESCRIPTION
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Return the number of bytes required to store the
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relocation information associated with section @var{sect}
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attached to bfd @var{abfd}. If an error occurs, return -1.
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*/
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long
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bfd_get_reloc_upper_bound (abfd, asect)
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bfd *abfd;
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sec_ptr asect;
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{
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if (abfd->format != bfd_object) {
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bfd_set_error (bfd_error_invalid_operation);
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return -1;
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}
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return BFD_SEND (abfd, _get_reloc_upper_bound, (abfd, asect));
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}
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/*
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FUNCTION
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bfd_canonicalize_reloc
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SYNOPSIS
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long bfd_canonicalize_reloc
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(bfd *abfd,
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asection *sec,
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arelent **loc,
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asymbol **syms);
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DESCRIPTION
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Call the back end associated with the open BFD
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@var{abfd} and translate the external form of the relocation
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information attached to @var{sec} into the internal canonical
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form. Place the table into memory at @var{loc}, which has
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been preallocated, usually by a call to
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<<bfd_get_reloc_upper_bound>>. Returns the number of relocs, or
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-1 on error.
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The @var{syms} table is also needed for horrible internal magic
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reasons.
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*/
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long
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bfd_canonicalize_reloc (abfd, asect, location, symbols)
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bfd *abfd;
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sec_ptr asect;
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arelent **location;
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asymbol **symbols;
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{
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if (abfd->format != bfd_object) {
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bfd_set_error (bfd_error_invalid_operation);
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return -1;
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}
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return BFD_SEND (abfd, _bfd_canonicalize_reloc,
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(abfd, asect, location, symbols));
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}
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/*
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FUNCTION
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bfd_set_reloc
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SYNOPSIS
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void bfd_set_reloc
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(bfd *abfd, asection *sec, arelent **rel, unsigned int count)
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DESCRIPTION
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Set the relocation pointer and count within
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section @var{sec} to the values @var{rel} and @var{count}.
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The argument @var{abfd} is ignored.
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*/
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/*ARGSUSED*/
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void
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bfd_set_reloc (ignore_abfd, asect, location, count)
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bfd *ignore_abfd;
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sec_ptr asect;
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arelent **location;
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unsigned int count;
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{
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asect->orelocation = location;
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asect->reloc_count = count;
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}
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/*
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FUNCTION
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bfd_set_file_flags
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SYNOPSIS
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boolean bfd_set_file_flags(bfd *abfd, flagword flags);
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DESCRIPTION
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Set the flag word in the BFD @var{abfd} to the value @var{flags}.
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Possible errors are:
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o <<bfd_error_wrong_format>> - The target bfd was not of object format.
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o <<bfd_error_invalid_operation>> - The target bfd was open for reading.
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o <<bfd_error_invalid_operation>> -
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The flag word contained a bit which was not applicable to the
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type of file. E.g., an attempt was made to set the <<D_PAGED>> bit
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on a BFD format which does not support demand paging.
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*/
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boolean
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bfd_set_file_flags (abfd, flags)
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bfd *abfd;
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flagword flags;
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{
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if (abfd->format != bfd_object) {
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bfd_set_error (bfd_error_wrong_format);
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return false;
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}
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if (bfd_read_p (abfd)) {
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bfd_set_error (bfd_error_invalid_operation);
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return false;
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}
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bfd_get_file_flags (abfd) = flags;
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if ((flags & bfd_applicable_file_flags (abfd)) != flags) {
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bfd_set_error (bfd_error_invalid_operation);
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return false;
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}
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return true;
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}
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void
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bfd_assert(file, line)
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char *file;
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int line;
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{
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fprintf(stderr, "bfd assertion fail %s:%d\n",file,line);
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}
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/*
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FUNCTION
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bfd_set_start_address
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SYNOPSIS
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boolean bfd_set_start_address(bfd *abfd, bfd_vma vma);
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DESCRIPTION
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Make @var{vma} the entry point of output BFD @var{abfd}.
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RETURNS
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Returns <<true>> on success, <<false>> otherwise.
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*/
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boolean
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bfd_set_start_address(abfd, vma)
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bfd *abfd;
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bfd_vma vma;
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{
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abfd->start_address = vma;
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return true;
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}
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/*
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FUNCTION
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bfd_get_mtime
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SYNOPSIS
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long bfd_get_mtime(bfd *abfd);
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DESCRIPTION
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Return the file modification time (as read from the file system, or
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from the archive header for archive members).
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*/
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long
|
||
bfd_get_mtime (abfd)
|
||
bfd *abfd;
|
||
{
|
||
FILE *fp;
|
||
struct stat buf;
|
||
|
||
if (abfd->mtime_set)
|
||
return abfd->mtime;
|
||
|
||
fp = bfd_cache_lookup (abfd);
|
||
if (0 != fstat (fileno (fp), &buf))
|
||
return 0;
|
||
|
||
abfd->mtime = buf.st_mtime; /* Save value in case anyone wants it */
|
||
return buf.st_mtime;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_get_size
|
||
|
||
SYNOPSIS
|
||
long bfd_get_size(bfd *abfd);
|
||
|
||
DESCRIPTION
|
||
Return the file size (as read from file system) for the file
|
||
associated with BFD @var{abfd}.
|
||
|
||
The initial motivation for, and use of, this routine is not
|
||
so we can get the exact size of the object the BFD applies to, since
|
||
that might not be generally possible (archive members for example).
|
||
It would be ideal if someone could eventually modify
|
||
it so that such results were guaranteed.
|
||
|
||
Instead, we want to ask questions like "is this NNN byte sized
|
||
object I'm about to try read from file offset YYY reasonable?"
|
||
As as example of where we might do this, some object formats
|
||
use string tables for which the first <<sizeof(long)>> bytes of the
|
||
table contain the size of the table itself, including the size bytes.
|
||
If an application tries to read what it thinks is one of these
|
||
string tables, without some way to validate the size, and for
|
||
some reason the size is wrong (byte swapping error, wrong location
|
||
for the string table, etc.), the only clue is likely to be a read
|
||
error when it tries to read the table, or a "virtual memory
|
||
exhausted" error when it tries to allocate 15 bazillon bytes
|
||
of space for the 15 bazillon byte table it is about to read.
|
||
This function at least allows us to answer the quesion, "is the
|
||
size reasonable?".
|
||
*/
|
||
|
||
long
|
||
bfd_get_size (abfd)
|
||
bfd *abfd;
|
||
{
|
||
FILE *fp;
|
||
struct stat buf;
|
||
|
||
fp = bfd_cache_lookup (abfd);
|
||
if (0 != fstat (fileno (fp), &buf))
|
||
return 0;
|
||
|
||
return buf.st_size;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_get_gp_size
|
||
|
||
SYNOPSIS
|
||
int bfd_get_gp_size(bfd *abfd);
|
||
|
||
DESCRIPTION
|
||
Return the maximum size of objects to be optimized using the GP
|
||
register under MIPS ECOFF. This is typically set by the <<-G>>
|
||
argument to the compiler, assembler or linker.
|
||
*/
|
||
|
||
int
|
||
bfd_get_gp_size (abfd)
|
||
bfd *abfd;
|
||
{
|
||
if (abfd->format == bfd_object)
|
||
{
|
||
if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
|
||
return ecoff_data (abfd)->gp_size;
|
||
else if (abfd->xvec->flavour == bfd_target_elf_flavour)
|
||
return elf_gp_size (abfd);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_set_gp_size
|
||
|
||
SYNOPSIS
|
||
void bfd_set_gp_size(bfd *abfd, int i);
|
||
|
||
DESCRIPTION
|
||
Set the maximum size of objects to be optimized using the GP
|
||
register under ECOFF or MIPS ELF. This is typically set by
|
||
the <<-G>> argument to the compiler, assembler or linker.
|
||
*/
|
||
|
||
void
|
||
bfd_set_gp_size (abfd, i)
|
||
bfd *abfd;
|
||
int i;
|
||
{
|
||
/* Don't try to set GP size on an archive or core file! */
|
||
if (abfd->format != bfd_object)
|
||
return;
|
||
if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
|
||
ecoff_data (abfd)->gp_size = i;
|
||
else if (abfd->xvec->flavour == bfd_target_elf_flavour)
|
||
elf_gp_size (abfd) = i;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_scan_vma
|
||
|
||
SYNOPSIS
|
||
bfd_vma bfd_scan_vma(CONST char *string, CONST char **end, int base);
|
||
|
||
DESCRIPTION
|
||
Convert, like <<strtoul>>, a numerical expression
|
||
@var{string} into a <<bfd_vma>> integer, and return that integer.
|
||
(Though without as many bells and whistles as <<strtoul>>.)
|
||
The expression is assumed to be unsigned (i.e., positive).
|
||
If given a @var{base}, it is used as the base for conversion.
|
||
A base of 0 causes the function to interpret the string
|
||
in hex if a leading "0x" or "0X" is found, otherwise
|
||
in octal if a leading zero is found, otherwise in decimal.
|
||
|
||
Overflow is not detected.
|
||
*/
|
||
|
||
bfd_vma
|
||
bfd_scan_vma (string, end, base)
|
||
CONST char *string;
|
||
CONST char **end;
|
||
int base;
|
||
{
|
||
bfd_vma value;
|
||
int digit;
|
||
|
||
/* Let the host do it if possible. */
|
||
if (sizeof(bfd_vma) <= sizeof(unsigned long))
|
||
return (bfd_vma) strtoul (string, 0, base);
|
||
|
||
/* A negative base makes no sense, and we only need to go as high as hex. */
|
||
if ((base < 0) || (base > 16))
|
||
return (bfd_vma) 0;
|
||
|
||
if (base == 0)
|
||
{
|
||
if (string[0] == '0')
|
||
{
|
||
if ((string[1] == 'x') || (string[1] == 'X'))
|
||
base = 16;
|
||
/* XXX should we also allow "0b" or "0B" to set base to 2? */
|
||
else
|
||
base = 8;
|
||
}
|
||
else
|
||
base = 10;
|
||
}
|
||
if ((base == 16) &&
|
||
(string[0] == '0') && ((string[1] == 'x') || (string[1] == 'X')))
|
||
string += 2;
|
||
/* XXX should we also skip over "0b" or "0B" if base is 2? */
|
||
|
||
/* Speed could be improved with a table like hex_value[] in gas. */
|
||
#define HEX_VALUE(c) \
|
||
(isxdigit(c) ? \
|
||
(isdigit(c) ? \
|
||
(c - '0') : \
|
||
(10 + c - (islower(c) ? 'a' : 'A'))) : \
|
||
42)
|
||
|
||
for (value = 0; (digit = HEX_VALUE(*string)) < base; string++)
|
||
{
|
||
value = value * base + digit;
|
||
}
|
||
|
||
if (end)
|
||
*end = string;
|
||
|
||
return value;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_copy_private_bfd_data
|
||
|
||
SYNOPSIS
|
||
boolean bfd_copy_private_bfd_data(bfd *ibfd, bfd *obfd);
|
||
|
||
DESCRIPTION
|
||
Copy private BFD information from the BFD @var{ibfd} to the
|
||
the BFD @var{obfd}. Return <<true>> on success, <<false>> on error.
|
||
Possible error returns are:
|
||
|
||
o <<bfd_error_no_memory>> -
|
||
Not enough memory exists to create private data for @var{obfd}.
|
||
|
||
.#define bfd_copy_private_bfd_data(ibfd, obfd) \
|
||
. BFD_SEND (ibfd, _bfd_copy_private_bfd_data, \
|
||
. (ibfd, obfd))
|
||
|
||
*/
|
||
|
||
/*
|
||
FUNCTION
|
||
stuff
|
||
|
||
DESCRIPTION
|
||
Stuff which should be documented:
|
||
|
||
.#define bfd_sizeof_headers(abfd, reloc) \
|
||
. BFD_SEND (abfd, _bfd_sizeof_headers, (abfd, reloc))
|
||
.
|
||
.#define bfd_find_nearest_line(abfd, sec, syms, off, file, func, line) \
|
||
. BFD_SEND (abfd, _bfd_find_nearest_line, (abfd, sec, syms, off, file, func, line))
|
||
.
|
||
. {* Do these three do anything useful at all, for any back end? *}
|
||
.#define bfd_debug_info_start(abfd) \
|
||
. BFD_SEND (abfd, _bfd_debug_info_start, (abfd))
|
||
.
|
||
.#define bfd_debug_info_end(abfd) \
|
||
. BFD_SEND (abfd, _bfd_debug_info_end, (abfd))
|
||
.
|
||
.#define bfd_debug_info_accumulate(abfd, section) \
|
||
. BFD_SEND (abfd, _bfd_debug_info_accumulate, (abfd, section))
|
||
.
|
||
.
|
||
.#define bfd_stat_arch_elt(abfd, stat) \
|
||
. BFD_SEND (abfd, _bfd_stat_arch_elt,(abfd, stat))
|
||
.
|
||
.#define bfd_set_arch_mach(abfd, arch, mach)\
|
||
. BFD_SEND ( abfd, _bfd_set_arch_mach, (abfd, arch, mach))
|
||
.
|
||
.#define bfd_get_relocated_section_contents(abfd, link_info, link_order, data, relocateable, symbols) \
|
||
. BFD_SEND (abfd, _bfd_get_relocated_section_contents, \
|
||
. (abfd, link_info, link_order, data, relocateable, symbols))
|
||
.
|
||
.#define bfd_relax_section(abfd, section, link_info, again) \
|
||
. BFD_SEND (abfd, _bfd_relax_section, (abfd, section, link_info, again))
|
||
.
|
||
.#define bfd_link_hash_table_create(abfd) \
|
||
. BFD_SEND (abfd, _bfd_link_hash_table_create, (abfd))
|
||
.
|
||
.#define bfd_link_add_symbols(abfd, info) \
|
||
. BFD_SEND (abfd, _bfd_link_add_symbols, (abfd, info))
|
||
.
|
||
.#define bfd_final_link(abfd, info) \
|
||
. BFD_SEND (abfd, _bfd_final_link, (abfd, info))
|
||
.
|
||
.#define bfd_free_cached_info(abfd) \
|
||
. BFD_SEND (abfd, _bfd_free_cached_info, (abfd))
|
||
.
|
||
|
||
*/
|