549 lines
23 KiB
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549 lines
23 KiB
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<title>bfd_target - Untitled</title>
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<!--
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This file documents the BFD library.
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Copyright (C) 1991, 2000, 2001, 2003, 2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``GNU General Public License'' and ``Funding
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<div class="node">
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<p>
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<a name="bfd_005ftarget"></a>Previous: <a rel="previous" accesskey="p" href="Targets.html#Targets">Targets</a>,
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Up: <a rel="up" accesskey="u" href="Targets.html#Targets">Targets</a>
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<hr><br>
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</div>
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<h4 class="subsection">2.12.1 bfd_target</h4>
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<p><strong>Description</strong><br>
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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, and which
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routines to call to do various operations.
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<p>Every BFD points to a target structure with its <code>xvec</code>
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member.
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<p>The macros below are used to dispatch to functions through the
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<code>bfd_target</code> vector. They are used in a number of macros further
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down in <span class="file">bfd.h</span>, and are also used when calling various
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routines by hand inside the BFD implementation. The <var>arglist</var>
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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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<p>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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<pre class="example"> #define BFD_SEND(bfd, message, arglist) \
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((*((bfd)->xvec->message)) arglist)
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#ifdef DEBUG_BFD_SEND
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#undef BFD_SEND
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#define BFD_SEND(bfd, message, arglist) \
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(((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \
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((*((bfd)->xvec->message)) arglist) : \
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(bfd_assert (__FILE__,__LINE__), NULL))
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#endif
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</pre>
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<p>For operations which index on the BFD format:
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<pre class="example"> #define BFD_SEND_FMT(bfd, message, arglist) \
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(((bfd)->xvec->message[(int) ((bfd)->format)]) arglist)
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#ifdef DEBUG_BFD_SEND
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#undef BFD_SEND_FMT
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#define BFD_SEND_FMT(bfd, message, arglist) \
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(((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \
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(((bfd)->xvec->message[(int) ((bfd)->format)]) arglist) : \
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(bfd_assert (__FILE__,__LINE__), NULL))
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#endif
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</pre>
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<p>This is the structure which defines the type of BFD this is. The
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<code>xvec</code> member of the struct <code>bfd</code> 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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<p>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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<pre class="example"> enum bfd_flavour
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{
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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_xcoff_flavour,
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bfd_target_elf_flavour,
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bfd_target_ieee_flavour,
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bfd_target_nlm_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_ihex_flavour,
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bfd_target_som_flavour,
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bfd_target_os9k_flavour,
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bfd_target_versados_flavour,
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bfd_target_msdos_flavour,
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bfd_target_ovax_flavour,
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bfd_target_evax_flavour,
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bfd_target_mmo_flavour,
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bfd_target_mach_o_flavour,
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bfd_target_pef_flavour,
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bfd_target_pef_xlib_flavour,
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bfd_target_sym_flavour
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};
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enum bfd_endian { BFD_ENDIAN_BIG, BFD_ENDIAN_LITTLE, BFD_ENDIAN_UNKNOWN };
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/* Forward declaration. */
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typedef struct bfd_link_info _bfd_link_info;
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typedef struct bfd_target
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{
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/* Identifies the kind of target, e.g., SunOS4, Ultrix, etc. */
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char *name;
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/* The "flavour" of a back end is a general indication about
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the contents of a file. */
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enum bfd_flavour flavour;
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/* The order of bytes within the data area of a file. */
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enum bfd_endian byteorder;
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/* The order of bytes within the header parts of a file. */
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enum bfd_endian header_byteorder;
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/* A mask of all the flags which an executable may have set -
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from the set <code>BFD_NO_FLAGS</code>, <code>HAS_RELOC</code>, ...<code>D_PAGED</code>. */
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flagword object_flags;
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/* A mask of all the flags which a section may have set - from
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the set <code>SEC_NO_FLAGS</code>, <code>SEC_ALLOC</code>, ...<code>SET_NEVER_LOAD</code>. */
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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 file names 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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/* Entries for byte swapping for data. These are different from the
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other entry points, since they don't take a BFD as the first argument.
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Certain other handlers could do the same. */
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bfd_uint64_t (*bfd_getx64) (const void *);
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bfd_int64_t (*bfd_getx_signed_64) (const void *);
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void (*bfd_putx64) (bfd_uint64_t, void *);
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bfd_vma (*bfd_getx32) (const void *);
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bfd_signed_vma (*bfd_getx_signed_32) (const void *);
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void (*bfd_putx32) (bfd_vma, void *);
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bfd_vma (*bfd_getx16) (const void *);
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bfd_signed_vma (*bfd_getx_signed_16) (const void *);
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void (*bfd_putx16) (bfd_vma, void *);
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/* Byte swapping for the headers. */
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bfd_uint64_t (*bfd_h_getx64) (const void *);
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bfd_int64_t (*bfd_h_getx_signed_64) (const void *);
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void (*bfd_h_putx64) (bfd_uint64_t, void *);
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bfd_vma (*bfd_h_getx32) (const void *);
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bfd_signed_vma (*bfd_h_getx_signed_32) (const void *);
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void (*bfd_h_putx32) (bfd_vma, void *);
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bfd_vma (*bfd_h_getx16) (const void *);
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bfd_signed_vma (*bfd_h_getx_signed_16) (const void *);
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void (*bfd_h_putx16) (bfd_vma, void *);
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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 a <code>bfd_target *</code> or zero. */
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const struct bfd_target *(*_bfd_check_format[bfd_type_end]) (bfd *);
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/* Set the format of a file being written. */
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bfd_boolean (*_bfd_set_format[bfd_type_end]) (bfd *);
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/* Write cached information into a file being written, at <code>bfd_close</code>. */
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bfd_boolean (*_bfd_write_contents[bfd_type_end]) (bfd *);
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</pre>
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<p>The general target vector. These vectors are initialized using the
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BFD_JUMP_TABLE macros.
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<pre class="example">
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/* Generic entry points. */
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#define BFD_JUMP_TABLE_GENERIC(NAME) \
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NAME##_close_and_cleanup, \
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NAME##_bfd_free_cached_info, \
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NAME##_new_section_hook, \
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NAME##_get_section_contents, \
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NAME##_get_section_contents_in_window
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/* Called when the BFD is being closed to do any necessary cleanup. */
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bfd_boolean (*_close_and_cleanup) (bfd *);
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/* Ask the BFD to free all cached information. */
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bfd_boolean (*_bfd_free_cached_info) (bfd *);
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/* Called when a new section is created. */
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bfd_boolean (*_new_section_hook) (bfd *, sec_ptr);
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/* Read the contents of a section. */
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bfd_boolean (*_bfd_get_section_contents)
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(bfd *, sec_ptr, void *, file_ptr, bfd_size_type);
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bfd_boolean (*_bfd_get_section_contents_in_window)
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(bfd *, sec_ptr, bfd_window *, file_ptr, bfd_size_type);
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/* Entry points to copy private data. */
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#define BFD_JUMP_TABLE_COPY(NAME) \
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NAME##_bfd_copy_private_bfd_data, \
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NAME##_bfd_merge_private_bfd_data, \
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_bfd_generic_init_private_section_data, \
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NAME##_bfd_copy_private_section_data, \
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NAME##_bfd_copy_private_symbol_data, \
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NAME##_bfd_copy_private_header_data, \
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NAME##_bfd_set_private_flags, \
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NAME##_bfd_print_private_bfd_data
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/* Called to copy BFD general private data from one object file
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to another. */
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bfd_boolean (*_bfd_copy_private_bfd_data) (bfd *, bfd *);
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/* Called to merge BFD general private data from one object file
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to a common output file when linking. */
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bfd_boolean (*_bfd_merge_private_bfd_data) (bfd *, bfd *);
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/* Called to initialize BFD private section data from one object file
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to another. */
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#define bfd_init_private_section_data(ibfd, isec, obfd, osec, link_info) \
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BFD_SEND (obfd, _bfd_init_private_section_data, (ibfd, isec, obfd, osec, link_info))
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bfd_boolean (*_bfd_init_private_section_data)
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(bfd *, sec_ptr, bfd *, sec_ptr, struct bfd_link_info *);
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/* Called to copy BFD private section data from one object file
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to another. */
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bfd_boolean (*_bfd_copy_private_section_data)
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(bfd *, sec_ptr, bfd *, sec_ptr);
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/* Called to copy BFD private symbol data from one symbol
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to another. */
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bfd_boolean (*_bfd_copy_private_symbol_data)
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(bfd *, asymbol *, bfd *, asymbol *);
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/* Called to copy BFD private header data from one object file
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to another. */
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bfd_boolean (*_bfd_copy_private_header_data)
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(bfd *, bfd *);
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/* Called to set private backend flags. */
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bfd_boolean (*_bfd_set_private_flags) (bfd *, flagword);
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/* Called to print private BFD data. */
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bfd_boolean (*_bfd_print_private_bfd_data) (bfd *, void *);
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/* Core file entry points. */
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#define BFD_JUMP_TABLE_CORE(NAME) \
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NAME##_core_file_failing_command, \
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NAME##_core_file_failing_signal, \
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NAME##_core_file_matches_executable_p
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char * (*_core_file_failing_command) (bfd *);
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int (*_core_file_failing_signal) (bfd *);
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bfd_boolean (*_core_file_matches_executable_p) (bfd *, bfd *);
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/* Archive entry points. */
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#define BFD_JUMP_TABLE_ARCHIVE(NAME) \
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NAME##_slurp_armap, \
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NAME##_slurp_extended_name_table, \
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NAME##_construct_extended_name_table, \
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NAME##_truncate_arname, \
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NAME##_write_armap, \
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NAME##_read_ar_hdr, \
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NAME##_openr_next_archived_file, \
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NAME##_get_elt_at_index, \
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NAME##_generic_stat_arch_elt, \
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NAME##_update_armap_timestamp
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bfd_boolean (*_bfd_slurp_armap) (bfd *);
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bfd_boolean (*_bfd_slurp_extended_name_table) (bfd *);
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bfd_boolean (*_bfd_construct_extended_name_table)
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(bfd *, char **, bfd_size_type *, const char **);
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void (*_bfd_truncate_arname) (bfd *, const char *, char *);
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bfd_boolean (*write_armap)
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(bfd *, unsigned int, struct orl *, unsigned int, int);
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void * (*_bfd_read_ar_hdr_fn) (bfd *);
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bfd * (*openr_next_archived_file) (bfd *, bfd *);
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#define bfd_get_elt_at_index(b,i) BFD_SEND (b, _bfd_get_elt_at_index, (b,i))
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bfd * (*_bfd_get_elt_at_index) (bfd *, symindex);
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int (*_bfd_stat_arch_elt) (bfd *, struct stat *);
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bfd_boolean (*_bfd_update_armap_timestamp) (bfd *);
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/* Entry points used for symbols. */
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#define BFD_JUMP_TABLE_SYMBOLS(NAME) \
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NAME##_get_symtab_upper_bound, \
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NAME##_canonicalize_symtab, \
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NAME##_make_empty_symbol, \
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NAME##_print_symbol, \
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NAME##_get_symbol_info, \
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NAME##_bfd_is_local_label_name, \
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NAME##_bfd_is_target_special_symbol, \
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NAME##_get_lineno, \
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NAME##_find_nearest_line, \
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_bfd_generic_find_line, \
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NAME##_find_inliner_info, \
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NAME##_bfd_make_debug_symbol, \
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NAME##_read_minisymbols, \
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NAME##_minisymbol_to_symbol
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long (*_bfd_get_symtab_upper_bound) (bfd *);
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long (*_bfd_canonicalize_symtab)
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(bfd *, struct bfd_symbol **);
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struct bfd_symbol *
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(*_bfd_make_empty_symbol) (bfd *);
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void (*_bfd_print_symbol)
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(bfd *, void *, struct bfd_symbol *, 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)
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(bfd *, struct bfd_symbol *, 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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bfd_boolean (*_bfd_is_local_label_name) (bfd *, const char *);
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bfd_boolean (*_bfd_is_target_special_symbol) (bfd *, asymbol *);
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alent * (*_get_lineno) (bfd *, struct bfd_symbol *);
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bfd_boolean (*_bfd_find_nearest_line)
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(bfd *, struct bfd_section *, struct bfd_symbol **, bfd_vma,
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const char **, const char **, unsigned int *);
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bfd_boolean (*_bfd_find_line)
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(bfd *, struct bfd_symbol **, struct bfd_symbol *,
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const char **, unsigned int *);
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bfd_boolean (*_bfd_find_inliner_info)
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(bfd *, const char **, const char **, unsigned int *);
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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)
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(bfd *, void *, unsigned long size);
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#define bfd_read_minisymbols(b, d, m, s) \
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BFD_SEND (b, _read_minisymbols, (b, d, m, s))
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long (*_read_minisymbols)
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(bfd *, bfd_boolean, void **, unsigned int *);
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#define bfd_minisymbol_to_symbol(b, d, m, f) \
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BFD_SEND (b, _minisymbol_to_symbol, (b, d, m, f))
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asymbol * (*_minisymbol_to_symbol)
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(bfd *, bfd_boolean, const void *, asymbol *);
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/* Routines for relocs. */
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#define BFD_JUMP_TABLE_RELOCS(NAME) \
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NAME##_get_reloc_upper_bound, \
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NAME##_canonicalize_reloc, \
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NAME##_bfd_reloc_type_lookup, \
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NAME##_bfd_reloc_name_lookup
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long (*_get_reloc_upper_bound) (bfd *, sec_ptr);
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long (*_bfd_canonicalize_reloc)
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(bfd *, sec_ptr, arelent **, struct bfd_symbol **);
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/* See documentation on reloc types. */
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reloc_howto_type *
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(*reloc_type_lookup) (bfd *, bfd_reloc_code_real_type);
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reloc_howto_type *
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(*reloc_name_lookup) (bfd *, const char *);
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/* Routines used when writing an object file. */
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#define BFD_JUMP_TABLE_WRITE(NAME) \
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NAME##_set_arch_mach, \
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NAME##_set_section_contents
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bfd_boolean (*_bfd_set_arch_mach)
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(bfd *, enum bfd_architecture, unsigned long);
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bfd_boolean (*_bfd_set_section_contents)
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(bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
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/* Routines used by the linker. */
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#define BFD_JUMP_TABLE_LINK(NAME) \
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NAME##_sizeof_headers, \
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NAME##_bfd_get_relocated_section_contents, \
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NAME##_bfd_relax_section, \
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NAME##_bfd_link_hash_table_create, \
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NAME##_bfd_link_hash_table_free, \
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NAME##_bfd_link_add_symbols, \
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NAME##_bfd_link_just_syms, \
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NAME##_bfd_final_link, \
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NAME##_bfd_link_split_section, \
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NAME##_bfd_gc_sections, \
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NAME##_bfd_merge_sections, \
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NAME##_bfd_is_group_section, \
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NAME##_bfd_discard_group, \
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NAME##_section_already_linked \
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int (*_bfd_sizeof_headers) (bfd *, struct bfd_link_info *);
|
|
bfd_byte * (*_bfd_get_relocated_section_contents)
|
|
(bfd *, struct bfd_link_info *, struct bfd_link_order *,
|
|
bfd_byte *, bfd_boolean, struct bfd_symbol **);
|
|
|
|
bfd_boolean (*_bfd_relax_section)
|
|
(bfd *, struct bfd_section *, struct bfd_link_info *, bfd_boolean *);
|
|
|
|
/* Create a hash table for the linker. Different backends store
|
|
different information in this table. */
|
|
struct bfd_link_hash_table *
|
|
(*_bfd_link_hash_table_create) (bfd *);
|
|
|
|
/* Release the memory associated with the linker hash table. */
|
|
void (*_bfd_link_hash_table_free) (struct bfd_link_hash_table *);
|
|
|
|
/* Add symbols from this object file into the hash table. */
|
|
bfd_boolean (*_bfd_link_add_symbols) (bfd *, struct bfd_link_info *);
|
|
|
|
/* Indicate that we are only retrieving symbol values from this section. */
|
|
void (*_bfd_link_just_syms) (asection *, struct bfd_link_info *);
|
|
|
|
/* Do a link based on the link_order structures attached to each
|
|
section of the BFD. */
|
|
bfd_boolean (*_bfd_final_link) (bfd *, struct bfd_link_info *);
|
|
|
|
/* Should this section be split up into smaller pieces during linking. */
|
|
bfd_boolean (*_bfd_link_split_section) (bfd *, struct bfd_section *);
|
|
|
|
/* Remove sections that are not referenced from the output. */
|
|
bfd_boolean (*_bfd_gc_sections) (bfd *, struct bfd_link_info *);
|
|
|
|
/* Attempt to merge SEC_MERGE sections. */
|
|
bfd_boolean (*_bfd_merge_sections) (bfd *, struct bfd_link_info *);
|
|
|
|
/* Is this section a member of a group? */
|
|
bfd_boolean (*_bfd_is_group_section) (bfd *, const struct bfd_section *);
|
|
|
|
/* Discard members of a group. */
|
|
bfd_boolean (*_bfd_discard_group) (bfd *, struct bfd_section *);
|
|
|
|
/* Check if SEC has been already linked during a reloceatable or
|
|
final link. */
|
|
void (*_section_already_linked) (bfd *, struct bfd_section *,
|
|
struct bfd_link_info *);
|
|
|
|
/* Routines to handle dynamic symbols and relocs. */
|
|
#define BFD_JUMP_TABLE_DYNAMIC(NAME) \
|
|
NAME##_get_dynamic_symtab_upper_bound, \
|
|
NAME##_canonicalize_dynamic_symtab, \
|
|
NAME##_get_synthetic_symtab, \
|
|
NAME##_get_dynamic_reloc_upper_bound, \
|
|
NAME##_canonicalize_dynamic_reloc
|
|
|
|
/* Get the amount of memory required to hold the dynamic symbols. */
|
|
long (*_bfd_get_dynamic_symtab_upper_bound) (bfd *);
|
|
/* Read in the dynamic symbols. */
|
|
long (*_bfd_canonicalize_dynamic_symtab)
|
|
(bfd *, struct bfd_symbol **);
|
|
/* Create synthetized symbols. */
|
|
long (*_bfd_get_synthetic_symtab)
|
|
(bfd *, long, struct bfd_symbol **, long, struct bfd_symbol **,
|
|
struct bfd_symbol **);
|
|
/* Get the amount of memory required to hold the dynamic relocs. */
|
|
long (*_bfd_get_dynamic_reloc_upper_bound) (bfd *);
|
|
/* Read in the dynamic relocs. */
|
|
long (*_bfd_canonicalize_dynamic_reloc)
|
|
(bfd *, arelent **, struct bfd_symbol **);
|
|
|
|
</pre>
|
|
<p>A pointer to an alternative bfd_target in case the current one is not
|
|
satisfactory. This can happen when the target cpu supports both big
|
|
and little endian code, and target chosen by the linker has the wrong
|
|
endianness. The function open_output() in ld/ldlang.c uses this field
|
|
to find an alternative output format that is suitable.
|
|
<pre class="example"> /* Opposite endian version of this target. */
|
|
const struct bfd_target * alternative_target;
|
|
|
|
/* Data for use by back-end routines, which isn't
|
|
generic enough to belong in this structure. */
|
|
const void *backend_data;
|
|
|
|
} bfd_target;
|
|
|
|
</pre>
|
|
<p><a name="index-bfd_005fset_005fdefault_005ftarget-1315"></a>
|
|
|
|
<h5 class="subsubsection">2.12.1.1 <code>bfd_set_default_target</code></h5>
|
|
|
|
<p><strong>Synopsis</strong>
|
|
<pre class="example"> bfd_boolean bfd_set_default_target (const char *name);
|
|
</pre>
|
|
<p><strong>Description</strong><br>
|
|
Set the default target vector to use when recognizing a BFD.
|
|
This takes the name of the target, which may be a BFD target
|
|
name or a configuration triplet.
|
|
|
|
<p><a name="index-bfd_005ffind_005ftarget-1316"></a>
|
|
|
|
<h5 class="subsubsection">2.12.1.2 <code>bfd_find_target</code></h5>
|
|
|
|
<p><strong>Synopsis</strong>
|
|
<pre class="example"> const bfd_target *bfd_find_target (const char *target_name, bfd *abfd);
|
|
</pre>
|
|
<p><strong>Description</strong><br>
|
|
Return a pointer to the transfer vector for the object target
|
|
named <var>target_name</var>. If <var>target_name</var> is <code>NULL</code>,
|
|
choose the one in the environment variable <code>GNUTARGET</code>; if
|
|
that is null or not defined, then choose the first entry in the
|
|
target list. Passing in the string "default" or setting the
|
|
environment variable to "default" will cause the first entry in
|
|
the target list to be returned, and "target_defaulted" will be
|
|
set in the BFD if <var>abfd</var> isn't <code>NULL</code>. This causes
|
|
<code>bfd_check_format</code> to loop over all the targets to find the
|
|
one that matches the file being read.
|
|
|
|
<p><a name="index-bfd_005ftarget_005flist-1317"></a>
|
|
|
|
<h5 class="subsubsection">2.12.1.3 <code>bfd_target_list</code></h5>
|
|
|
|
<p><strong>Synopsis</strong>
|
|
<pre class="example"> const char ** bfd_target_list (void);
|
|
</pre>
|
|
<p><strong>Description</strong><br>
|
|
Return a freshly malloced NULL-terminated
|
|
vector of the names of all the valid BFD targets. Do not
|
|
modify the names.
|
|
|
|
<p><a name="index-bfd_005fseach_005ffor_005ftarget-1318"></a>
|
|
|
|
<h5 class="subsubsection">2.12.1.4 <code>bfd_seach_for_target</code></h5>
|
|
|
|
<p><strong>Synopsis</strong>
|
|
<pre class="example"> const bfd_target *bfd_search_for_target
|
|
(int (*search_func) (const bfd_target *, void *),
|
|
void *);
|
|
</pre>
|
|
<p><strong>Description</strong><br>
|
|
Return a pointer to the first transfer vector in the list of
|
|
transfer vectors maintained by BFD that produces a non-zero
|
|
result when passed to the function <var>search_func</var>. The
|
|
parameter <var>data</var> is passed, unexamined, to the search
|
|
function.
|
|
|
|
</body></html>
|
|
|