bfdt.texi

这个是LINUX下的GDB调度工具的源码

@example
bfd_boolean bfd_set_file_flags (bfd *abfd, flagword flags);
@end example
@strong{Description}@*
Set the flag word in the BFD @var{abfd} to the value @var{flags}.

Possible errors are:
@itemize @bullet

@item
@code{bfd_error_wrong_format} - The target bfd was not of object format.
@item
@code{bfd_error_invalid_operation} - The target bfd was open for reading.
@item
@code{bfd_error_invalid_operation} -
The flag word contained a bit which was not applicable to the
type of file.  E.g., an attempt was made to set the @code{D_PAGED} bit
on a BFD format which does not support demand paging.
@end itemize

@findex bfd_get_arch_size
@subsubsection @code{bfd_get_arch_size}
@strong{Synopsis}
@example
int bfd_get_arch_size (bfd *abfd);
@end example
@strong{Description}@*
Returns the architecture address size, in bits, as determined
by the object file's format.  For ELF, this information is
included in the header.

@strong{Returns}@*
Returns the arch size in bits if known, @code{-1} otherwise.

@findex bfd_get_sign_extend_vma
@subsubsection @code{bfd_get_sign_extend_vma}
@strong{Synopsis}
@example
int bfd_get_sign_extend_vma (bfd *abfd);
@end example
@strong{Description}@*
Indicates if the target architecture "naturally" sign extends
an address.  Some architectures implicitly sign extend address
values when they are converted to types larger than the size
of an address.  For instance, bfd_get_start_address() will
return an address sign extended to fill a bfd_vma when this is
the case.

@strong{Returns}@*
Returns @code{1} if the target architecture is known to sign
extend addresses, @code{0} if the target architecture is known to
not sign extend addresses, and @code{-1} otherwise.

@findex bfd_set_start_address
@subsubsection @code{bfd_set_start_address}
@strong{Synopsis}
@example
bfd_boolean bfd_set_start_address (bfd *abfd, bfd_vma vma);
@end example
@strong{Description}@*
Make @var{vma} the entry point of output BFD @var{abfd}.

@strong{Returns}@*
Returns @code{TRUE} on success, @code{FALSE} otherwise.

@findex bfd_get_gp_size
@subsubsection @code{bfd_get_gp_size}
@strong{Synopsis}
@example
unsigned int bfd_get_gp_size (bfd *abfd);
@end example
@strong{Description}@*
Return the maximum size of objects to be optimized using the GP
register under MIPS ECOFF.  This is typically set by the @code{-G}
argument to the compiler, assembler or linker.

@findex bfd_set_gp_size
@subsubsection @code{bfd_set_gp_size}
@strong{Synopsis}
@example
void bfd_set_gp_size (bfd *abfd, unsigned int i);
@end example
@strong{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 @code{-G} argument to the compiler, assembler or linker.

@findex bfd_scan_vma
@subsubsection @code{bfd_scan_vma}
@strong{Synopsis}
@example
bfd_vma bfd_scan_vma (const char *string, const char **end, int base);
@end example
@strong{Description}@*
Convert, like @code{strtoul}, a numerical expression
@var{string} into a @code{bfd_vma} integer, and return that integer.
(Though without as many bells and whistles as @code{strtoul}.)
The expression is assumed to be unsigned (i.e., positive).
If given a @var{base}, it is used as the base for conversion.
A base of 0 causes the function to interpret the string
in hex if a leading "0x" or "0X" is found, otherwise
in octal if a leading zero is found, otherwise in decimal.

If the value would overflow, the maximum @code{bfd_vma} value is
returned.

@findex bfd_copy_private_header_data
@subsubsection @code{bfd_copy_private_header_data}
@strong{Synopsis}
@example
bfd_boolean bfd_copy_private_header_data (bfd *ibfd, bfd *obfd);
@end example
@strong{Description}@*
Copy private BFD header information from the BFD @var{ibfd} to the
the BFD @var{obfd}.  This copies information that may require
sections to exist, but does not require symbol tables.  Return
@code{true} on success, @code{false} on error.
Possible error returns are:

@itemize @bullet

@item
@code{bfd_error_no_memory} -
Not enough memory exists to create private data for @var{obfd}.
@end itemize
@example
#define bfd_copy_private_header_data(ibfd, obfd) \
     BFD_SEND (obfd, _bfd_copy_private_header_data, \
               (ibfd, obfd))
@end example

@findex bfd_copy_private_bfd_data
@subsubsection @code{bfd_copy_private_bfd_data}
@strong{Synopsis}
@example
bfd_boolean bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd);
@end example
@strong{Description}@*
Copy private BFD information from the BFD @var{ibfd} to the
the BFD @var{obfd}.  Return @code{TRUE} on success, @code{FALSE} on error.
Possible error returns are:

@itemize @bullet

@item
@code{bfd_error_no_memory} -
Not enough memory exists to create private data for @var{obfd}.
@end itemize
@example
#define bfd_copy_private_bfd_data(ibfd, obfd) \
     BFD_SEND (obfd, _bfd_copy_private_bfd_data, \
               (ibfd, obfd))
@end example

@findex bfd_merge_private_bfd_data
@subsubsection @code{bfd_merge_private_bfd_data}
@strong{Synopsis}
@example
bfd_boolean bfd_merge_private_bfd_data (bfd *ibfd, bfd *obfd);
@end example
@strong{Description}@*
Merge private BFD information from the BFD @var{ibfd} to the
the output file BFD @var{obfd} when linking.  Return @code{TRUE}
on success, @code{FALSE} on error.  Possible error returns are:

@itemize @bullet

@item
@code{bfd_error_no_memory} -
Not enough memory exists to create private data for @var{obfd}.
@end itemize
@example
#define bfd_merge_private_bfd_data(ibfd, obfd) \
     BFD_SEND (obfd, _bfd_merge_private_bfd_data, \
               (ibfd, obfd))
@end example

@findex bfd_set_private_flags
@subsubsection @code{bfd_set_private_flags}
@strong{Synopsis}
@example
bfd_boolean bfd_set_private_flags (bfd *abfd, flagword flags);
@end example
@strong{Description}@*
Set private BFD flag information in the BFD @var{abfd}.
Return @code{TRUE} on success, @code{FALSE} on error.  Possible error
returns are:

@itemize @bullet

@item
@code{bfd_error_no_memory} -
Not enough memory exists to create private data for @var{obfd}.
@end itemize
@example
#define bfd_set_private_flags(abfd, flags) \
     BFD_SEND (abfd, _bfd_set_private_flags, (abfd, flags))
@end example

@findex Other functions
@subsubsection @code{Other functions}
@strong{Description}@*
The following functions exist but have not yet been documented.
@example
#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))

#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_update_armap_timestamp(abfd) \
       BFD_SEND (abfd, _bfd_update_armap_timestamp, (abfd))

#define bfd_set_arch_mach(abfd, arch, mach)\
       BFD_SEND ( abfd, _bfd_set_arch_mach, (abfd, arch, mach))

#define bfd_relax_section(abfd, section, link_info, again) \
       BFD_SEND (abfd, _bfd_relax_section, (abfd, section, link_info, again))

#define bfd_gc_sections(abfd, link_info) \
       BFD_SEND (abfd, _bfd_gc_sections, (abfd, link_info))

#define bfd_merge_sections(abfd, link_info) \
       BFD_SEND (abfd, _bfd_merge_sections, (abfd, link_info))

#define bfd_is_group_section(abfd, sec) \
       BFD_SEND (abfd, _bfd_is_group_section, (abfd, sec))

#define bfd_discard_group(abfd, sec) \
       BFD_SEND (abfd, _bfd_discard_group, (abfd, sec))

#define bfd_link_hash_table_create(abfd) \
       BFD_SEND (abfd, _bfd_link_hash_table_create, (abfd))

#define bfd_link_hash_table_free(abfd, hash) \
       BFD_SEND (abfd, _bfd_link_hash_table_free, (hash))

#define bfd_link_add_symbols(abfd, info) \
       BFD_SEND (abfd, _bfd_link_add_symbols, (abfd, info))

#define bfd_link_just_syms(sec, info) \
       BFD_SEND (abfd, _bfd_link_just_syms, (sec, info))

#define bfd_final_link(abfd, info) \
       BFD_SEND (abfd, _bfd_final_link, (abfd, info))

#define bfd_free_cached_info(abfd) \
       BFD_SEND (abfd, _bfd_free_cached_info, (abfd))

#define bfd_get_dynamic_symtab_upper_bound(abfd) \
       BFD_SEND (abfd, _bfd_get_dynamic_symtab_upper_bound, (abfd))

#define bfd_print_private_bfd_data(abfd, file)\
       BFD_SEND (abfd, _bfd_print_private_bfd_data, (abfd, file))

#define bfd_canonicalize_dynamic_symtab(abfd, asymbols) \
       BFD_SEND (abfd, _bfd_canonicalize_dynamic_symtab, (abfd, asymbols))

#define bfd_get_synthetic_symtab(abfd, count, syms, dyncount, dynsyms, ret) \
       BFD_SEND (abfd, _bfd_get_synthetic_symtab, (abfd, count, syms, \
                                                   dyncount, dynsyms, ret))

#define bfd_get_dynamic_reloc_upper_bound(abfd) \
       BFD_SEND (abfd, _bfd_get_dynamic_reloc_upper_bound, (abfd))

#define bfd_canonicalize_dynamic_reloc(abfd, arels, asyms) \
       BFD_SEND (abfd, _bfd_canonicalize_dynamic_reloc, (abfd, arels, asyms))

extern bfd_byte *bfd_get_relocated_section_contents
  (bfd *, struct bfd_link_info *, struct bfd_link_order *, bfd_byte *,
   bfd_boolean, asymbol **);

@end example

@findex bfd_alt_mach_code
@subsubsection @code{bfd_alt_mach_code}
@strong{Synopsis}
@example
bfd_boolean bfd_alt_mach_code (bfd *abfd, int alternative);
@end example
@strong{Description}@*
When more than one machine code number is available for the
same machine type, this function can be used to switch between
the preferred one (alternative == 0) and any others.  Currently,
only ELF supports this feature, with up to two alternate
machine codes.


@example
struct bfd_preserve
@{
  void *marker;
  void *tdata;
  flagword flags;
  const struct bfd_arch_info *arch_info;
  struct bfd_section *sections;
  struct bfd_section **section_tail;
  unsigned int section_count;
  struct bfd_hash_table section_htab;
@};

@end example
@findex bfd_preserve_save
@subsubsection @code{bfd_preserve_save}
@strong{Synopsis}
@example
bfd_boolean bfd_preserve_save (bfd *, struct bfd_preserve *);
@end example
@strong{Description}@*
When testing an object for compatibility with a particular
target back-end, the back-end object_p function needs to set
up certain fields in the bfd on successfully recognizing the
object.  This typically happens in a piecemeal fashion, with
failures possible at many points.  On failure, the bfd is
supposed to be restored to its initial state, which is
virtually impossible.  However, restoring a subset of the bfd
state works in practice.  This function stores the subset and
reinitializes the bfd.

@findex bfd_preserve_restore
@subsubsection @code{bfd_preserve_restore}
@strong{Synopsis}
@example
void bfd_preserve_restore (bfd *, struct bfd_preserve *);
@end example
@strong{Description}@*
This function restores bfd state saved by bfd_preserve_save.
If MARKER is non-NULL in struct bfd_preserve then that block
and all subsequently bfd_alloc'd memory is freed.

@findex bfd_preserve_finish
@subsubsection @code{bfd_preserve_finish}
@strong{Synopsis}
@example
void bfd_preserve_finish (bfd *, struct bfd_preserve *);
@end example
@strong{Description}@*
This function should be called when the bfd state saved by
bfd_preserve_save is no longer needed.  ie. when the back-end
object_p function returns with success.