mirror of
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578 lines
20 KiB
Plaintext
578 lines
20 KiB
Plaintext
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@example
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/* Set to N to open the next N BFDs using an alternate id space. */
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extern unsigned int bfd_use_reserved_id;
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@end example
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@section Opening and closing BFDs
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@subsection Functions for opening and closing
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@findex bfd_fopen
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@subsubsection @code{bfd_fopen}
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@strong{Synopsis}
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@example
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bfd *bfd_fopen (const char *filename, const char *target,
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const char *mode, int fd);
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@end example
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@strong{Description}@*
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Open the file @var{filename} with the target @var{target}.
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Return a pointer to the created BFD. If @var{fd} is not -1,
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then @code{fdopen} is used to open the file; otherwise, @code{fopen}
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is used. @var{mode} is passed directly to @code{fopen} or
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@code{fdopen}.
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Calls @code{bfd_find_target}, so @var{target} is interpreted as by
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that function.
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The new BFD is marked as cacheable iff @var{fd} is -1.
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If @code{NULL} is returned then an error has occured. Possible errors
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are @code{bfd_error_no_memory}, @code{bfd_error_invalid_target} or
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@code{system_call} error.
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On error, @var{fd} is always closed.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_openr
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@subsubsection @code{bfd_openr}
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@strong{Synopsis}
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@example
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bfd *bfd_openr (const char *filename, const char *target);
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@end example
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@strong{Description}@*
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Open the file @var{filename} (using @code{fopen}) with the target
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@var{target}. Return a pointer to the created BFD.
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Calls @code{bfd_find_target}, so @var{target} is interpreted as by
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that function.
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If @code{NULL} is returned then an error has occured. Possible errors
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are @code{bfd_error_no_memory}, @code{bfd_error_invalid_target} or
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@code{system_call} error.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_fdopenr
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@subsubsection @code{bfd_fdopenr}
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@strong{Synopsis}
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@example
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bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
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@end example
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@strong{Description}@*
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@code{bfd_fdopenr} is to @code{bfd_fopenr} much like @code{fdopen} is to
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@code{fopen}. It opens a BFD on a file already described by the
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@var{fd} supplied.
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When the file is later @code{bfd_close}d, the file descriptor will
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be closed. If the caller desires that this file descriptor be
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cached by BFD (opened as needed, closed as needed to free
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descriptors for other opens), with the supplied @var{fd} used as
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an initial file descriptor (but subject to closure at any time),
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call bfd_set_cacheable(bfd, 1) on the returned BFD. The default
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is to assume no caching; the file descriptor will remain open
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until @code{bfd_close}, and will not be affected by BFD operations
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on other files.
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Possible errors are @code{bfd_error_no_memory},
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@code{bfd_error_invalid_target} and @code{bfd_error_system_call}.
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On error, @var{fd} is closed.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_fdopenw
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@subsubsection @code{bfd_fdopenw}
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@strong{Synopsis}
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@example
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bfd *bfd_fdopenw (const char *filename, const char *target, int fd);
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@end example
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@strong{Description}@*
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@code{bfd_fdopenw} is exactly like @code{bfd_fdopenr} with the exception that
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the resulting BFD is suitable for output.
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@findex bfd_openstreamr
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@subsubsection @code{bfd_openstreamr}
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@strong{Synopsis}
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@example
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bfd *bfd_openstreamr (const char * filename, const char * target,
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void * stream);
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@end example
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@strong{Description}@*
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Open a BFD for read access on an existing stdio stream. When
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the BFD is passed to @code{bfd_close}, the stream will be closed.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_openr_iovec
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@subsubsection @code{bfd_openr_iovec}
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@strong{Synopsis}
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@example
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bfd *bfd_openr_iovec (const char *filename, const char *target,
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void *(*open_func) (struct bfd *nbfd,
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void *open_closure),
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void *open_closure,
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file_ptr (*pread_func) (struct bfd *nbfd,
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void *stream,
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void *buf,
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file_ptr nbytes,
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file_ptr offset),
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int (*close_func) (struct bfd *nbfd,
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void *stream),
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int (*stat_func) (struct bfd *abfd,
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void *stream,
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struct stat *sb));
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@end example
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@strong{Description}@*
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Create and return a BFD backed by a read-only @var{stream}.
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The @var{stream} is created using @var{open_func}, accessed using
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@var{pread_func} and destroyed using @var{close_func}.
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Calls @code{bfd_find_target}, so @var{target} is interpreted as by
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that function.
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Calls @var{open_func} (which can call @code{bfd_zalloc} and
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@code{bfd_get_filename}) to obtain the read-only stream backing
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the BFD. @var{open_func} either succeeds returning the
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non-@code{NULL} @var{stream}, or fails returning @code{NULL}
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(setting @code{bfd_error}).
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Calls @var{pread_func} to request @var{nbytes} of data from
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@var{stream} starting at @var{offset} (e.g., via a call to
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@code{bfd_read}). @var{pread_func} either succeeds returning the
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number of bytes read (which can be less than @var{nbytes} when
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end-of-file), or fails returning -1 (setting @code{bfd_error}).
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Calls @var{close_func} when the BFD is later closed using
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@code{bfd_close}. @var{close_func} either succeeds returning 0, or
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fails returning -1 (setting @code{bfd_error}).
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Calls @var{stat_func} to fill in a stat structure for bfd_stat,
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bfd_get_size, and bfd_get_mtime calls. @var{stat_func} returns 0
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on success, or returns -1 on failure (setting @code{bfd_error}).
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If @code{bfd_openr_iovec} returns @code{NULL} then an error has
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occurred. Possible errors are @code{bfd_error_no_memory},
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@code{bfd_error_invalid_target} and @code{bfd_error_system_call}.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_openw
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@subsubsection @code{bfd_openw}
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@strong{Synopsis}
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@example
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bfd *bfd_openw (const char *filename, const char *target);
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@end example
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@strong{Description}@*
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Create a BFD, associated with file @var{filename}, using the
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file format @var{target}, and return a pointer to it.
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Possible errors are @code{bfd_error_system_call}, @code{bfd_error_no_memory},
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@code{bfd_error_invalid_target}.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_close
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@subsubsection @code{bfd_close}
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@strong{Synopsis}
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@example
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bool bfd_close (bfd *abfd);
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@end example
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@strong{Description}@*
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Close a BFD. If the BFD was open for writing, then pending
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operations are completed and the file written out and closed.
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If the created file is executable, then @code{chmod} is called
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to mark it as such.
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All memory attached to the BFD is released.
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The file descriptor associated with the BFD is closed (even
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if it was passed in to BFD by @code{bfd_fdopenr}).
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_close_all_done
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@subsubsection @code{bfd_close_all_done}
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@strong{Synopsis}
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@example
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bool bfd_close_all_done (bfd *);
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@end example
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@strong{Description}@*
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Close a BFD. Differs from @code{bfd_close} since it does not
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complete any pending operations. This routine would be used
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if the application had just used BFD for swapping and didn't
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want to use any of the writing code.
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If the created file is executable, then @code{chmod} is called
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to mark it as such.
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All memory attached to the BFD is released.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_create
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@subsubsection @code{bfd_create}
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@strong{Synopsis}
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@example
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bfd *bfd_create (const char *filename, bfd *templ);
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@end example
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@strong{Description}@*
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Create a new BFD in the manner of @code{bfd_openw}, but without
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opening a file. The new BFD takes the target from the target
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used by @var{templ}. The format is always set to @code{bfd_object}.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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@findex bfd_make_writable
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@subsubsection @code{bfd_make_writable}
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@strong{Synopsis}
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@example
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bool bfd_make_writable (bfd *abfd);
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@end example
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@strong{Description}@*
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Takes a BFD as created by @code{bfd_create} and converts it
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into one like as returned by @code{bfd_openw}. It does this
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by converting the BFD to BFD_IN_MEMORY. It's assumed that
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you will call @code{bfd_make_readable} on this bfd later.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_make_readable
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@subsubsection @code{bfd_make_readable}
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@strong{Synopsis}
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@example
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bool bfd_make_readable (bfd *abfd);
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@end example
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@strong{Description}@*
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Takes a BFD as created by @code{bfd_create} and
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@code{bfd_make_writable} and converts it into one like as
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returned by @code{bfd_openr}. It does this by writing the
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contents out to the memory buffer, then reversing the
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direction.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_alloc
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@subsubsection @code{bfd_alloc}
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@strong{Synopsis}
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@example
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void *bfd_alloc (bfd *abfd, bfd_size_type wanted);
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@end example
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@strong{Description}@*
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Allocate a block of @var{wanted} bytes of memory attached to
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@code{abfd} and return a pointer to it.
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@findex bfd_zalloc
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@subsubsection @code{bfd_zalloc}
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@strong{Synopsis}
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@example
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void *bfd_zalloc (bfd *abfd, bfd_size_type wanted);
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@end example
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@strong{Description}@*
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Allocate a block of @var{wanted} bytes of zeroed memory
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attached to @code{abfd} and return a pointer to it.
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@findex bfd_calc_gnu_debuglink_crc32
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@subsubsection @code{bfd_calc_gnu_debuglink_crc32}
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@strong{Synopsis}
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@example
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unsigned long bfd_calc_gnu_debuglink_crc32
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(unsigned long crc, const unsigned char *buf, bfd_size_type len);
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@end example
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@strong{Description}@*
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Computes a CRC value as used in the .gnu_debuglink section.
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Advances the previously computed @var{crc} value by computing
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and adding in the crc32 for @var{len} bytes of @var{buf}.
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@strong{Returns}@*
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Return the updated CRC32 value.
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@findex bfd_get_debug_link_info_1
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@subsubsection @code{bfd_get_debug_link_info_1}
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@strong{Synopsis}
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@example
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char *bfd_get_debug_link_info_1 (bfd *abfd, void *crc32_out);
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@end example
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@strong{Description}@*
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Extracts the filename and CRC32 value for any separate debug
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information file associated with @var{abfd}.
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The @var{crc32_out} parameter is an untyped pointer because
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this routine is used as a @code{get_func_type} function, but it
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is expected to be an unsigned long pointer.
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@strong{Returns}@*
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The filename of the associated debug information file, or NULL
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if there is no such file. If the filename was found then the
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contents of @var{crc32_out} are updated to hold the corresponding
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CRC32 value for the file.
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The returned filename is allocated with @code{malloc}; freeing
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it is the responsibility of the caller.
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@findex bfd_get_debug_link_info
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@subsubsection @code{bfd_get_debug_link_info}
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@strong{Synopsis}
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@example
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char *bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out);
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@end example
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@strong{Description}@*
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Extracts the filename and CRC32 value for any separate debug
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information file associated with @var{abfd}.
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@strong{Returns}@*
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The filename of the associated debug information file, or NULL
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if there is no such file. If the filename was found then the
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contents of @var{crc32_out} are updated to hold the corresponding
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CRC32 value for the file.
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The returned filename is allocated with @code{malloc}; freeing
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it is the responsibility of the caller.
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@findex bfd_get_alt_debug_link_info
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@subsubsection @code{bfd_get_alt_debug_link_info}
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@strong{Synopsis}
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@example
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char *bfd_get_alt_debug_link_info (bfd * abfd,
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bfd_size_type *buildid_len,
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bfd_byte **buildid_out);
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@end example
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@strong{Description}@*
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Fetch the filename and BuildID value for any alternate debuginfo
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associated with @var{abfd}. Return NULL if no such info found,
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otherwise return filename and update @var{buildid_len} and
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@var{buildid_out}. The returned filename and build_id are
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allocated with @code{malloc}; freeing them is the responsibility
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of the caller.
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@findex separate_debug_file_exists
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@subsubsection @code{separate_debug_file_exists}
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@strong{Synopsis}
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@example
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bool separate_debug_file_exists
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(char *name, void *crc32_p);
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@end example
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@strong{Description}@*
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Checks to see if @var{name} is a file and if its contents
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match @var{crc32}, which is a pointer to an @code{unsigned
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long} containing a CRC32.
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The @var{crc32_p} parameter is an untyped pointer because
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this routine is used as a @code{check_func_type} function.
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@findex separate_alt_debug_file_exists
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@subsubsection @code{separate_alt_debug_file_exists}
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@strong{Synopsis}
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@example
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bool separate_alt_debug_file_exists
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(char *name, void *unused);
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@end example
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@strong{Description}@*
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Checks to see if @var{name} is a file.
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@findex find_separate_debug_file
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@subsubsection @code{find_separate_debug_file}
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@strong{Synopsis}
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@example
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char *find_separate_debug_file
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(bfd *abfd, const char *dir, bool include_dirs,
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get_func_type get, check_func_type check, void *data);
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@end example
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@strong{Description}@*
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Searches for a debug information file corresponding to @var{abfd}.
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The name of the separate debug info file is returned by the
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@var{get} function. This function scans various fixed locations
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in the filesystem, including the file tree rooted at @var{dir}.
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If the @var{include_dirs} parameter is true then the directory
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components of @var{abfd}'s filename will be included in the
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searched locations.
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@var{data} is passed unmodified to the @var{get} and @var{check}
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functions. It is generally used to implement build-id-like
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matching in the callback functions.
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@strong{Returns}@*
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Returns the filename of the first file to be found which
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receives a TRUE result from the @var{check} function.
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Returns NULL if no valid file could be found.
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@findex bfd_follow_gnu_debuglink
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@subsubsection @code{bfd_follow_gnu_debuglink}
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@strong{Synopsis}
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@example
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char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
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@end example
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@strong{Description}@*
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Takes a BFD and searches it for a .gnu_debuglink section. If this
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section is found, it examines the section for the name and checksum
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of a '.debug' file containing auxiliary debugging information. It
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then searches the filesystem for this .debug file in some standard
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locations, including the directory tree rooted at @var{dir}, and if
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found returns the full filename.
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If @var{dir} is NULL, the search will take place starting at
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the current directory.
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@strong{Returns}@*
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@code{NULL} on any errors or failure to locate the .debug file,
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otherwise a pointer to a heap-allocated string containing the
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filename. The caller is responsible for freeing this string.
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@findex bfd_follow_gnu_debugaltlink
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@subsubsection @code{bfd_follow_gnu_debugaltlink}
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@strong{Synopsis}
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@example
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char *bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir);
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@end example
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@strong{Description}@*
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Takes a BFD and searches it for a .gnu_debugaltlink section. If this
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section is found, it examines the section for the name of a file
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containing auxiliary debugging information. It then searches the
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filesystem for this file in a set of standard locations, including
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the directory tree rooted at @var{dir}, and if found returns the
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full filename.
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If @var{dir} is NULL, the search will take place starting at
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the current directory.
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@strong{Returns}@*
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@code{NULL} on any errors or failure to locate the debug file,
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otherwise a pointer to a heap-allocated string containing the
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filename. The caller is responsible for freeing this string.
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@findex bfd_create_gnu_debuglink_section
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@subsubsection @code{bfd_create_gnu_debuglink_section}
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@strong{Synopsis}
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@example
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struct bfd_section *bfd_create_gnu_debuglink_section
|
|
(bfd *abfd, const char *filename);
|
|
@end example
|
|
@strong{Description}@*
|
|
Takes a @var{BFD} and adds a .gnu_debuglink section to it. The
|
|
section is sized to be big enough to contain a link to the specified
|
|
@var{filename}.
|
|
|
|
@strong{Returns}@*
|
|
A pointer to the new section is returned if all is ok. Otherwise
|
|
@code{NULL} is returned and bfd_error is set.
|
|
|
|
@findex bfd_fill_in_gnu_debuglink_section
|
|
@subsubsection @code{bfd_fill_in_gnu_debuglink_section}
|
|
@strong{Synopsis}
|
|
@example
|
|
bool bfd_fill_in_gnu_debuglink_section
|
|
(bfd *abfd, struct bfd_section *sect, const char *filename);
|
|
@end example
|
|
@strong{Description}@*
|
|
Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
|
|
and fills in the contents of the section to contain a link to the
|
|
specified @var{filename}. The filename should be relative to the
|
|
current directory.
|
|
|
|
@strong{Returns}@*
|
|
@code{TRUE} is returned if all is ok. Otherwise @code{FALSE} is returned
|
|
and bfd_error is set.
|
|
|
|
@findex get_build_id
|
|
@subsubsection @code{get_build_id}
|
|
@strong{Synopsis}
|
|
@example
|
|
struct bfd_build_id * get_build_id (bfd *abfd);
|
|
@end example
|
|
@strong{Description}@*
|
|
Finds the build-id associated with @var{abfd}. If the build-id is
|
|
extracted from the note section then a build-id structure is built
|
|
for it, using memory allocated to @var{abfd}, and this is then
|
|
attached to the @var{abfd}.
|
|
|
|
@strong{Returns}@*
|
|
Returns a pointer to the build-id structure if a build-id could be
|
|
found. If no build-id is found NULL is returned and error code is
|
|
set.
|
|
|
|
@findex get_build_id_name
|
|
@subsubsection @code{get_build_id_name}
|
|
@strong{Synopsis}
|
|
@example
|
|
char * get_build_id_name (bfd *abfd, void *build_id_out_p)
|
|
@end example
|
|
@strong{Description}@*
|
|
Searches @var{abfd} for a build-id, and then constructs a pathname
|
|
from it. The path is computed as .build-id/NN/NN+NN.debug where
|
|
NNNN+NN is the build-id value as a hexadecimal string.
|
|
|
|
@strong{Returns}@*
|
|
Returns the constructed filename or NULL upon error.
|
|
It is the caller's responsibility to free the memory used to hold the
|
|
filename.
|
|
If a filename is returned then the @var{build_id_out_p}
|
|
parameter (which points to a @code{struct bfd_build_id}
|
|
pointer) is set to a pointer to the build_id structure.
|
|
|
|
@findex check_build_id_file
|
|
@subsubsection @code{check_build_id_file}
|
|
@strong{Synopsis}
|
|
@example
|
|
bool check_build_id_file (char *name, void *buildid_p);
|
|
@end example
|
|
@strong{Description}@*
|
|
Checks to see if @var{name} is a readable file and if its build-id
|
|
matches @var{buildid}.
|
|
|
|
@strong{Returns}@*
|
|
Returns TRUE if the file exists, is readable, and contains a
|
|
build-id which matches the build-id pointed at by
|
|
@var{build_id_p} (which is really a @code{struct bfd_build_id **}).
|
|
|
|
@findex bfd_follow_build_id_debuglink
|
|
@subsubsection @code{bfd_follow_build_id_debuglink}
|
|
@strong{Synopsis}
|
|
@example
|
|
char *bfd_follow_build_id_debuglink (bfd *abfd, const char *dir);
|
|
@end example
|
|
@strong{Description}@*
|
|
Takes @var{abfd} and searches it for a .note.gnu.build-id section.
|
|
If this section is found, it extracts the value of the NT_GNU_BUILD_ID
|
|
note, which should be a hexadecimal value @var{NNNN+NN} (for
|
|
32+ hex digits). It then searches the filesystem for a file named
|
|
@var{.build-id/NN/NN+NN.debug} in a set of standard locations,
|
|
including the directory tree rooted at @var{dir}. The filename
|
|
of the first matching file to be found is returned. A matching
|
|
file should contain a .note.gnu.build-id section with the same
|
|
@var{NNNN+NN} note as @var{abfd}, although this check is currently
|
|
not implemented.
|
|
|
|
If @var{dir} is NULL, the search will take place starting at
|
|
the current directory.
|
|
|
|
@strong{Returns}@*
|
|
@code{NULL} on any errors or failure to locate the debug file,
|
|
otherwise a pointer to a heap-allocated string containing the
|
|
filename. The caller is responsible for freeing this string.
|
|
|
|
@findex bfd_set_filename
|
|
@subsubsection @code{bfd_set_filename}
|
|
@strong{Synopsis}
|
|
@example
|
|
const char *bfd_set_filename (bfd *abfd, const char *filename);
|
|
@end example
|
|
@strong{Description}@*
|
|
Set the filename of @var{abfd}, copying the FILENAME parameter to
|
|
bfd_alloc'd memory owned by @var{abfd}. Returns a pointer the
|
|
newly allocated name, or NULL if the allocation failed.
|
|
|