737 lines
18 KiB
C
737 lines
18 KiB
C
/* Generic BFD library interface and support routines.
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Copyright (C) 1990, 1991, 1992, 1993 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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$Id: bfd.c,v 1.1 1994/01/28 12:37:38 pk Exp $
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*/
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/*
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SECTION
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<<typedef bfd>>
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A BFD is has type <<bfd>>; objects of this type are the
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cornerstone of any application using <<libbfd>>. References
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though the BFD and to data in the BFD give the entire BFD
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functionality.
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Here is the struct used to define the type <<bfd>>. This
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contains the major data about the file, and contains 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 being cached *}
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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 what matching algorithm
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. to use to chose 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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.
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. file_ptr where;
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.
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. {* and here:*}
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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.*}
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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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. 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*}
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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;
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. struct _bfd *next;
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. struct _bfd *archive_head;
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. boolean has_armap;
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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 hppa_data_struct *hppa_data;
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. struct hpux_core_struct *hpux_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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. 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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. {* Is this really needed in addition to usrdata? *}
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. asymbol **ld_symbols;
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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 "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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#undef strerror
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extern char *strerror();
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/** Error handling
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o - Most functions return nonzero on success (check doc for
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precise semantics); 0 or NULL on error.
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o - Internal errors are documented by the value of bfd_error.
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If that is system_call_error then check errno.
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o - The easiest way to report this to the user is to use bfd_perror.
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*/
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bfd_ec 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 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 relocation info",
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"No more archived files",
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"Malformed archive",
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"Symbol not found",
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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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static
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void
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DEFUN(bfd_nonrepresentable_section,(abfd, name),
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CONST bfd * CONST abfd AND
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CONST char * CONST name)
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{
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fprintf(stderr,
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"bfd error writing file %s, format %s can't represent section %s\n",
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abfd->filename,
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abfd->xvec->name,
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name);
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exit(1);
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}
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/*ARGSUSED*/
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static
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void
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DEFUN(bfd_undefined_symbol,(relent, seclet),
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CONST arelent *relent AND
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CONST struct bfd_seclet *seclet)
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{
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asymbol *symbol = *(relent->sym_ptr_ptr);
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fprintf(stderr, "bfd error relocating, symbol %s is undefined\n",
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symbol->name);
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exit(1);
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}
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/*ARGSUSED*/
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static
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void
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DEFUN(bfd_reloc_value_truncated,(relent, seclet),
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CONST arelent *relent AND
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struct bfd_seclet *seclet)
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{
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fprintf(stderr, "bfd error relocating, value truncated\n");
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exit(1);
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}
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/*ARGSUSED*/
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static
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void
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DEFUN(bfd_reloc_is_dangerous,(relent, seclet),
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CONST arelent *relent AND
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CONST struct bfd_seclet *seclet)
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{
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fprintf(stderr, "bfd error relocating, dangerous\n");
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exit(1);
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}
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bfd_error_vector_type bfd_error_vector =
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{
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bfd_nonrepresentable_section ,
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bfd_undefined_symbol,
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bfd_reloc_value_truncated,
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bfd_reloc_is_dangerous,
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};
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CONST char *
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bfd_errmsg (error_tag)
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bfd_ec 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 == system_call_error)
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return strerror (errno);
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if ((((int)error_tag <(int) no_error) ||
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((int)error_tag > (int)invalid_error_code)))
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error_tag = invalid_error_code;/* sanity check */
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return bfd_errmsgs [(int)error_tag];
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}
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void
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DEFUN (bfd_default_error_trap, (error_tag),
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bfd_ec error_tag)
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{
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fprintf(stderr, "bfd assert fail (%s)\n", bfd_errmsg(error_tag));
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}
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void (*bfd_error_trap) PARAMS ((bfd_ec)) = bfd_default_error_trap;
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void (*bfd_error_nonrepresentabltrap) PARAMS ((bfd_ec)) = bfd_default_error_trap;
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void
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DEFUN(bfd_perror,(message),
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CONST char *message)
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{
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if (bfd_error == system_call_error)
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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_error));
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else
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fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_error));
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}
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}
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/** Symbols */
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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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unsigned int bfd_get_reloc_upper_bound(bfd *abfd, asection *sect);
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DESCRIPTION
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This function return the number of bytes required to store the
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relocation information associated with section <<sect>>
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attached to bfd <<abfd>>
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*/
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unsigned int
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DEFUN(bfd_get_reloc_upper_bound,(abfd, asect),
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bfd *abfd AND
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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_error = invalid_operation;
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return 0;
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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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unsigned int 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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This function calls the back end associated with the open
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<<abfd>> and translates the external form of the relocation
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information attached to <<sec>> into the internal canonical
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form. The table is placed into memory at <<loc>>, which has
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been preallocated, usually by a call to
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<<bfd_get_reloc_upper_bound>>.
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The <<syms>> table is also needed for horrible internal magic
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reasons.
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*/
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unsigned int
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DEFUN(bfd_canonicalize_reloc,(abfd, asect, location, symbols),
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bfd *abfd AND
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sec_ptr asect AND
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arelent **location AND
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asymbol **symbols)
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{
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if (abfd->format != bfd_object) {
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bfd_error = invalid_operation;
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return 0;
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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_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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This function attempts to set the flag word in the referenced
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BFD structure to the value supplied.
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Possible errors are:
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o wrong_format - The target bfd was not of object format.
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o invalid_operation - The target bfd was open for reading.
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o 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. eg, 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_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_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_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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/*
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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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This function sets the relocation pointer and count within a
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section to the supplied values.
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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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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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DESCRIPTION
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Marks the entry point of an output BFD.
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RETURNS
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Returns <<true>> on success, <<false>> otherwise.
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SYNOPSIS
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boolean bfd_set_start_address(bfd *, bfd_vma);
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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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The bfd_get_mtime function
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SYNOPSIS
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long bfd_get_mtime(bfd *);
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DESCRIPTION
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Return file modification time (as read from file system, or
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from archive header for archive members).
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*/
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long
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bfd_get_mtime (abfd)
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bfd *abfd;
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{
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FILE *fp;
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struct stat buf;
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if (abfd->mtime_set)
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return abfd->mtime;
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fp = bfd_cache_lookup (abfd);
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if (0 != fstat (fileno (fp), &buf))
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return 0;
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abfd->mtime = buf.st_mtime; /* Save value in case anyone wants it */
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return buf.st_mtime;
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}
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/*
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FUNCTION
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The bfd_get_size function
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SYNOPSIS
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long bfd_get_size(bfd *);
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DESCRIPTION
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Return file size (as read from file system) for the file
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associated with a bfd.
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Note that the initial motivation for, and use of, this routine is not
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so we can get the exact size of the object the bfd applies to, since
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that might not be generally possible (archive members for example?).
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Although it would be ideal if someone could eventually modify
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it so that such results were guaranteed.
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Instead, we want to ask questions like "is this NNN byte sized
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object I'm about to try read from file offset YYY reasonable?"
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As as example of where we might want to do this, some object formats
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use string tables for which the first sizeof(long) bytes of the table
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contain the size of the table itself, including the size bytes.
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If an application tries to read what it thinks is one of these
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string tables, without some way to validate the size, and for
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some reason the size is wrong (byte swapping error, wrong location
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for the string table, etc), the only clue is likely to be a read
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error when it tries to read the table, or a "virtual memory
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exhausted" error when it tries to allocated 15 bazillon bytes
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of space for the 15 bazillon byte table it is about to read.
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This function at least allows us to answer the quesion, "is the
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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
|
||
The bfd_get_gp_size function
|
||
|
||
SYNOPSIS
|
||
int bfd_get_gp_size(bfd *);
|
||
|
||
DESCRIPTION
|
||
Get 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->xvec->flavour == bfd_target_ecoff_flavour)
|
||
return ecoff_data (abfd)->gp_size;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
The bfd_set_gp_size function
|
||
|
||
SYNOPSIS
|
||
void bfd_set_gp_size(bfd *, int);
|
||
|
||
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;
|
||
{
|
||
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
|
||
|
||
DESCRIPTION
|
||
Converts, like strtoul, a numerical expression as a
|
||
string into a bfd_vma integer, and returns that integer.
|
||
(Though without as many bells and whistles as strtoul.)
|
||
The expression is assumed to be unsigned (i.e. positive).
|
||
If given a 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.
|
||
|
||
SYNOPSIS
|
||
bfd_vma bfd_scan_vma(CONST char *string, CONST char **end, int base);
|
||
*/
|
||
|
||
bfd_vma
|
||
DEFUN(bfd_scan_vma,(string, end, base),
|
||
CONST char *string AND
|
||
CONST char **end AND
|
||
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
|
||
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, seclet, data, relocateable) \
|
||
. BFD_SEND (abfd, _bfd_get_relocated_section_contents, (abfd, seclet, data, relocateable))
|
||
.
|
||
.#define bfd_relax_section(abfd, section, symbols) \
|
||
. BFD_SEND (abfd, _bfd_relax_section, (abfd, section, symbols))
|
||
.
|
||
.#define bfd_seclet_link(abfd, data, relocateable) \
|
||
. BFD_SEND (abfd, _bfd_seclet_link, (abfd, data, relocateable))
|
||
|
||
*/
|