561 lines
17 KiB
C
561 lines
17 KiB
C
/* Generic target-file-type support for the BFD library.
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Copyright 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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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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/*
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SECTION
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Targets
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DESCRIPTION
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Each port of BFD to a different machine requries the creation
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of a target back end. All the back end provides to the root
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part of BFD is a structure containing pointers to functions
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which perform certain low level operations on files. BFD
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translates the applications's requests through a pointer into
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calls to the back end routines.
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When a file is opened with <<bfd_openr>>, its format and
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target are unknown. BFD uses various mechanisms to determine
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how to interpret the file. The operations performed are:
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o First a BFD is created by calling the internal routine
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<<new_bfd>>, then <<bfd_find_target>> is called with the
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target string supplied to <<bfd_openr>> and the new BFD pointer.
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o If a null target string was provided to <<bfd_find_target>>,
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it looks up the environment variable <<GNUTARGET>> and uses
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that as the target string.
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o If the target string is still NULL, or the target string is
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<<default>>, then the first item in the target vector is used
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as the target type, and <<target_defaulted>> is set to
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cause <<bfd_check_format>> to loop through all the targets.
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@xref{bfd_target}. @xref{Formats}.
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o Otherwise, the elements in the target vector are inspected
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one by one, until a match on target name is found. When found,
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that is used.
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o Otherwise the error <<invalid_target>> is returned to
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<<bfd_openr>>.
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o <<bfd_openr>> attempts to open the file using
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<<bfd_open_file>>, and returns the BFD.
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Once the BFD has been opened and the target selected, the file
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format may be determined. This is done by calling
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<<bfd_check_format>> on the BFD with a suggested format.
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If <<target_defaulted>> has been set, each possible target
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type is tried to see if it recognizes the specified format. The
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routine returns <<true>> when the application guesses right.
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@menu
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@* bfd_target::
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@end menu
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*/
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/*
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INODE
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bfd_target, , Targets, Targets
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DOCDD
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SUBSECTION
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bfd_target
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DESCRIPTION
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This structure contains everything that BFD knows about a
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target. It includes things like its byte order, name, what
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routines to call to do various operations, etc.
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Every BFD points to a target structure with its <<xvec>>
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member.
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These macros are used to dispatch to functions through the
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bfd_target vector. They are used in a number of macros further
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down in @file{bfd.h}, and are also used when calling various
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routines by hand inside the BFD implementation. The "arglist"
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argument must be parenthesized; it contains all the arguments
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to the called function.
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They make the documentation (more) unpleasant to read, so if
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someone wants to fix this and not break the above, please do.
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.#define BFD_SEND(bfd, message, arglist) \
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. ((*((bfd)->xvec->message)) arglist)
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For operations which index on the BFD format
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.#define BFD_SEND_FMT(bfd, message, arglist) \
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. (((bfd)->xvec->message[(int)((bfd)->format)]) arglist)
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This is the struct which defines the type of BFD this is. The
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<<xvec>> member of the struct <<bfd>> itself points here. Each
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module that implements access to a different target under BFD,
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defines one of these.
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FIXME, these names should be rationalised with the names of
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the entry points which call them. Too bad we can't have one
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macro to define them both!
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.typedef struct bfd_target
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.{
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Identifies the kind of target, eg SunOS4, Ultrix, etc.
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. char *name;
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The "flavour" of a back end is a general indication about the contents
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of a file.
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. enum target_flavour {
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. bfd_target_unknown_flavour,
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. bfd_target_aout_flavour,
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. bfd_target_coff_flavour,
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. bfd_target_ecoff_flavour,
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. bfd_target_elf_flavour,
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. bfd_target_ieee_flavour,
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. bfd_target_oasys_flavour,
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. bfd_target_tekhex_flavour,
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. bfd_target_srec_flavour,
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. bfd_target_hppa_flavour} flavour;
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The order of bytes within the data area of a file.
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. boolean byteorder_big_p;
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The order of bytes within the header parts of a file.
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. boolean header_byteorder_big_p;
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This is a mask of all the flags which an executable may have set -
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from the set <<NO_FLAGS>>, <<HAS_RELOC>>, ...<<D_PAGED>>.
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. flagword object_flags;
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This is a mask of all the flags which a section may have set - from
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the set <<SEC_NO_FLAGS>>, <<SEC_ALLOC>>, ...<<SET_NEVER_LOAD>>.
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. flagword section_flags;
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The character normally found at the front of a symbol
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(if any), perhaps _.
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. char symbol_leading_char;
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The pad character for filenames within an archive header.
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. char ar_pad_char;
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The maximum number of characters in an archive header.
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. unsigned short ar_max_namelen;
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The minimum alignment restriction for any section.
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. unsigned int align_power_min;
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Entries for byte swapping for data. These are different to the other
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entry points, since they don't take BFD as first arg. Certain other handlers
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could do the same.
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. bfd_vma (*bfd_getx64) PARAMS ((bfd_byte *));
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. bfd_signed_vma (*bfd_getx_signed_64) PARAMS ((bfd_byte *));
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. void (*bfd_putx64) PARAMS ((bfd_vma, bfd_byte *));
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. bfd_vma (*bfd_getx32) PARAMS ((bfd_byte *));
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. bfd_signed_vma (*bfd_getx_signed_32) PARAMS ((bfd_byte *));
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. void (*bfd_putx32) PARAMS ((bfd_vma, bfd_byte *));
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. bfd_vma (*bfd_getx16) PARAMS ((bfd_byte *));
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. bfd_signed_vma (*bfd_getx_signed_16) PARAMS ((bfd_byte *));
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. void (*bfd_putx16) PARAMS ((bfd_vma, bfd_byte *));
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Byte swapping for the headers
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. bfd_vma (*bfd_h_getx64) PARAMS ((bfd_byte *));
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. bfd_signed_vma (*bfd_h_getx_signed_64) PARAMS ((bfd_byte *));
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. void (*bfd_h_putx64) PARAMS ((bfd_vma, bfd_byte *));
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. bfd_vma (*bfd_h_getx32) PARAMS ((bfd_byte *));
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. bfd_signed_vma (*bfd_h_getx_signed_32) PARAMS ((bfd_byte *));
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. void (*bfd_h_putx32) PARAMS ((bfd_vma, bfd_byte *));
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. bfd_vma (*bfd_h_getx16) PARAMS ((bfd_byte *));
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. bfd_signed_vma (*bfd_h_getx_signed_16) PARAMS ((bfd_byte *));
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. void (*bfd_h_putx16) PARAMS ((bfd_vma, bfd_byte *));
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Format dependent routines: these are vectors of entry points
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within the target vector structure, one for each format to check.
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Check the format of a file being read. Return bfd_target * or zero.
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. struct bfd_target * (*_bfd_check_format[bfd_type_end]) PARAMS ((bfd *));
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Set the format of a file being written.
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. boolean (*_bfd_set_format[bfd_type_end]) PARAMS ((bfd *));
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Write cached information into a file being written, at bfd_close.
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. boolean (*_bfd_write_contents[bfd_type_end]) PARAMS ((bfd *));
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The following functions are defined in <<JUMP_TABLE>>. The idea is
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that the back end writer of <<foo>> names all the routines
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<<foo_>>@var{entry_point}, <<JUMP_TABLE>> will built the entries
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in this structure in the right order.
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Core file entry points
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. char * (*_core_file_failing_command) PARAMS ((bfd *));
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. int (*_core_file_failing_signal) PARAMS ((bfd *));
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. boolean (*_core_file_matches_executable_p) PARAMS ((bfd *, bfd *));
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Archive entry points
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. boolean (*_bfd_slurp_armap) PARAMS ((bfd *));
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. boolean (*_bfd_slurp_extended_name_table) PARAMS ((bfd *));
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. void (*_bfd_truncate_arname) PARAMS ((bfd *, CONST char *, char *));
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. boolean (*write_armap) PARAMS ((bfd *arch,
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. unsigned int elength,
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. struct orl *map,
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. unsigned int orl_count,
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. int stridx));
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Standard stuff.
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. boolean (*_close_and_cleanup) PARAMS ((bfd *));
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. boolean (*_bfd_set_section_contents) PARAMS ((bfd *, sec_ptr, PTR,
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. file_ptr, bfd_size_type));
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. boolean (*_bfd_get_section_contents) PARAMS ((bfd *, sec_ptr, PTR,
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. file_ptr, bfd_size_type));
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. boolean (*_new_section_hook) PARAMS ((bfd *, sec_ptr));
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Symbols and relocations
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. unsigned int (*_get_symtab_upper_bound) PARAMS ((bfd *));
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. unsigned int (*_bfd_canonicalize_symtab) PARAMS ((bfd *,
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. struct symbol_cache_entry **));
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. unsigned int (*_get_reloc_upper_bound) PARAMS ((bfd *, sec_ptr));
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. unsigned int (*_bfd_canonicalize_reloc) PARAMS ((bfd *, sec_ptr, arelent **,
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. struct symbol_cache_entry **));
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. struct symbol_cache_entry *
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. (*_bfd_make_empty_symbol) PARAMS ((bfd *));
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. void (*_bfd_print_symbol) PARAMS ((bfd *, PTR,
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. struct symbol_cache_entry *,
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. bfd_print_symbol_type));
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.#define bfd_print_symbol(b,p,s,e) BFD_SEND(b, _bfd_print_symbol, (b,p,s,e))
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. void (*_bfd_get_symbol_info) PARAMS ((bfd *,
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. struct symbol_cache_entry *,
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. symbol_info *));
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.#define bfd_get_symbol_info(b,p,e) BFD_SEND(b, _bfd_get_symbol_info, (b,p,e))
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. alent * (*_get_lineno) PARAMS ((bfd *, struct symbol_cache_entry *));
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.
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. boolean (*_bfd_set_arch_mach) PARAMS ((bfd *, enum bfd_architecture,
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. unsigned long));
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.
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. bfd * (*openr_next_archived_file) PARAMS ((bfd *arch, bfd *prev));
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.
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. boolean (*_bfd_find_nearest_line) PARAMS ((bfd *abfd,
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. struct sec *section, struct symbol_cache_entry **symbols,
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. bfd_vma offset, CONST char **file, CONST char **func,
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. unsigned int *line));
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.
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. int (*_bfd_stat_arch_elt) PARAMS ((bfd *, struct stat *));
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.
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. int (*_bfd_sizeof_headers) PARAMS ((bfd *, boolean));
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.
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. void (*_bfd_debug_info_start) PARAMS ((bfd *));
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. void (*_bfd_debug_info_end) PARAMS ((bfd *));
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. void (*_bfd_debug_info_accumulate) PARAMS ((bfd *, struct sec *));
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.
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. bfd_byte * (*_bfd_get_relocated_section_contents) PARAMS ((bfd *,
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. struct bfd_seclet *, bfd_byte *data,
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. boolean relocateable));
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.
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. boolean (*_bfd_relax_section) PARAMS ((bfd *, struct sec *,
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. struct symbol_cache_entry **));
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.
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. boolean (*_bfd_seclet_link) PARAMS ((bfd *, PTR data,
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. boolean relocateable));
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. {* See documentation on reloc types. *}
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. CONST struct reloc_howto_struct *
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. (*reloc_type_lookup) PARAMS ((bfd *abfd,
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. bfd_reloc_code_real_type code));
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.
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. {* Back-door to allow format-aware applications to create debug symbols
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. while using BFD for everything else. Currently used by the assembler
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. when creating COFF files. *}
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. asymbol * (*_bfd_make_debug_symbol) PARAMS ((
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. bfd *abfd,
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. void *ptr,
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. unsigned long size));
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Data for use by back-end routines, which isn't generic enough to belong
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in this structure.
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. PTR backend_data;
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.} bfd_target;
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*/
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/* The default is to define a target_vector containing all the targets.
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By setting MINIMIZE=1 on the "make" command line, the user can change this
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to a vector containing just DEFAULT_VECTOR and any required
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traditional-core-file handler. (This is to save space in the executables.)
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The config files can also override the default large vector by giving an
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explicit SELECT_VECS macro. */
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#if MINIMIZE && defined(DEFAULT_VECTOR) && !defined(SELECT_VECS)
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#ifdef TRAD_CORE
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#define SELECT_VECS &DEFAULT_VECTOR,&trad_core_vec
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#else
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#ifdef SCO_CORE
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#define SELECT_VECS &DEFAULT_VECTOR,&sco_core_vec
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#else
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#ifdef AIX386_CORE
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#define SELECT_VECS &DEFAULT_VECTOR,&aix386_core_vec
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#else
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#define SELECT_VECS &DEFAULT_VECTOR
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#endif
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#endif
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#endif
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#endif
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/* All known xvecs. They are listed a second time below, since
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we can't intermix extern's and initializers. */
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extern bfd_target i386lynx_vec;
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extern bfd_target ecoff_little_vec;
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extern bfd_target ecoff_big_vec;
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extern bfd_target aout_mips_little_vec;
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extern bfd_target aout_mips_big_vec;
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extern bfd_target sunos_big_vec;
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extern bfd_target demo_64_vec;
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extern bfd_target srec_vec;
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extern bfd_target symbolsrec_vec;
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extern bfd_target tekhex_vec;
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extern bfd_target a_out_adobe_vec;
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extern bfd_target b_out_vec_little_host;
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extern bfd_target b_out_vec_big_host;
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extern bfd_target icoff_little_vec;
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extern bfd_target icoff_big_vec;
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extern bfd_target bfd_elf32_sparc_vec;
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extern bfd_target bfd_elf32_i386_vec;
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extern bfd_target bfd_elf32_m68k_vec;
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extern bfd_target bfd_elf32_i860_vec;
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extern bfd_target ieee_vec;
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extern bfd_target oasys_vec;
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extern bfd_target m88kbcs_vec;
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extern bfd_target m68kcoff_vec;
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extern bfd_target i386coff_vec;
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extern bfd_target i386aout_vec;
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extern bfd_target i386linux_vec;
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extern bfd_target a29kcoff_big_vec;
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extern bfd_target trad_core_vec;
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extern bfd_target sco_core_vec;
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extern bfd_target aix386_core_vec;
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extern bfd_target rs6000coff_vec;
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extern bfd_target h8300coff_vec;
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extern bfd_target h8500coff_vec;
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extern bfd_target z8kcoff_vec;
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extern bfd_target we32kcoff_vec;
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extern bfd_target shcoff_vec;
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#if defined (HOST_HPPAHPUX) || defined (HOST_HPPABSD)
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extern bfd_target hppa_vec;
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#endif
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#ifdef DEFAULT_VECTOR
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extern bfd_target DEFAULT_VECTOR;
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#endif
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bfd_target *target_vector[] = {
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#ifdef SELECT_VECS
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SELECT_VECS,
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#else /* not SELECT_VECS */
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#ifdef DEFAULT_VECTOR
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&DEFAULT_VECTOR,
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#endif
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&i386coff_vec,
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&i386aout_vec,
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&i386lynx_vec,
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&ecoff_little_vec,
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&ecoff_big_vec,
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&aout_mips_little_vec,
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&aout_mips_big_vec,
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&ieee_vec,
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#if 0
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/* We have no oasys tools anymore, so we can't test any of this
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anymore. If you want to test the stuff yourself, go ahead...
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steve@cygnus.com
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Worse, since there is no magic number for archives, there
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can annoying target mis-matches. */
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&oasys_vec,
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#endif
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&sunos_big_vec,
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#ifdef HOST_64_BIT
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&demo_64_vec, /* Only compiled if host has long-long support */
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#endif
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&h8300coff_vec,
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&z8kcoff_vec,
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&m88kbcs_vec,
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&srec_vec,
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&symbolsrec_vec,
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/* &tekhex_vec,*/
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&icoff_little_vec,
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&icoff_big_vec,
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&bfd_elf32_sparc_vec,
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&bfd_elf32_i386_vec,
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&bfd_elf32_m68k_vec,
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&bfd_elf32_i860_vec,
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&a_out_adobe_vec,
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&b_out_vec_little_host,
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&b_out_vec_big_host,
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&m68kcoff_vec,
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&a29kcoff_big_vec,
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&rs6000coff_vec,
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#if defined (HOST_HPPAHPUX) || defined (HOST_HPPABSD)
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&hppa_vec,
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#endif
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&we32kcoff_vec,
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#ifdef TRAD_CORE
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&trad_core_vec,
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#endif
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#ifdef SCO_CORE
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&sco_core_vec,
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#endif
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#ifdef AIX386_CORE
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&aix386_core_vec,
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#endif
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#endif /* not SELECT_VECS */
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NULL, /* end of list marker */
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};
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/* default_vector[0] contains either the address of the default vector,
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if there is one, or zero if there isn't. */
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bfd_target *default_vector[] = {
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#ifdef DEFAULT_VECTOR
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&DEFAULT_VECTOR,
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#endif
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0,
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};
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/*
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FUNCTION
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bfd_find_target
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DESCRIPTION
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Returns a pointer to the transfer vector for the object target
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named target_name. If target_name is NULL, chooses the one in
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the environment variable GNUTARGET; if that is null or not
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defined thenthe first entry in the target list is chosen.
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Passing in the string "default" or setting the environment
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variable to "default" will cause the first entry in the target
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list to be returned, and "target_defaulted" will be set in the
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BFD. This causes <<bfd_check_format>> to loop over all the
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targets to find the one that matches the file being read.
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SYNOPSIS
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bfd_target *bfd_find_target(CONST char *, bfd *);
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*/
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bfd_target *
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DEFUN(bfd_find_target,(target_name, abfd),
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CONST char *target_name AND
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bfd *abfd)
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{
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bfd_target **target;
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extern char *getenv ();
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CONST char *targname = (target_name ? target_name :
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(CONST char *) getenv ("GNUTARGET"));
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/* This is safe; the vector cannot be null */
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if (targname == NULL || !strcmp (targname, "default")) {
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abfd->target_defaulted = true;
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return abfd->xvec = target_vector[0];
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}
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abfd->target_defaulted = false;
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for (target = &target_vector[0]; *target != NULL; target++) {
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if (!strcmp (targname, (*target)->name))
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return abfd->xvec = *target;
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}
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bfd_error = invalid_target;
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return NULL;
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}
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/*
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FUNCTION
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bfd_target_list
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DESCRIPTION
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This function returns a freshly malloced NULL-terminated
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vector of the names of all the valid BFD targets. Do not
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modify the names
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SYNOPSIS
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CONST char **bfd_target_list(void);
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*/
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CONST char **
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DEFUN_VOID(bfd_target_list)
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{
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int vec_length= 0;
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#ifdef NATIVE_HPPAHPUX_COMPILER
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/* The native compiler on the HP9000/700 has a bug which causes it
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to loop endlessly when compiling this file. This avoids it. */
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volatile
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#endif
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bfd_target **target;
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CONST char **name_list, **name_ptr;
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for (target = &target_vector[0]; *target != NULL; target++)
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vec_length++;
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name_ptr =
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name_list = (CONST char **) zalloc ((vec_length + 1) * sizeof (char **));
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if (name_list == NULL) {
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bfd_error = no_memory;
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return NULL;
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}
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for (target = &target_vector[0]; *target != NULL; target++)
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*(name_ptr++) = (*target)->name;
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return name_list;
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}
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