Next: Memory Usage, Previous: Error reporting, Up: BFD front end
bfd_get_reloc_upper_boundSynopsis
long bfd_get_reloc_upper_bound (bfd *abfd, asection *sect);
Description
Return the number of bytes required to store the
relocation information associated with section sect
attached to bfd abfd. If an error occurs, return -1.
bfd_canonicalize_relocSynopsis
long bfd_canonicalize_reloc
(bfd *abfd, asection *sec, arelent **loc, asymbol **syms);
Description
Call the back end associated with the open BFD
abfd and translate the external form of the relocation
information attached to sec into the internal canonical
form. Place the table into memory at loc, which has
been preallocated, usually by a call to
bfd_get_reloc_upper_bound. Returns the number of relocs, or
-1 on error.
The syms table is also needed for horrible internal magic reasons.
bfd_set_relocSynopsis
void bfd_set_reloc
(bfd *abfd, asection *sec, arelent **rel, unsigned int count);
Description
Set the relocation pointer and count within
section sec to the values rel and count.
The argument abfd is ignored.
bfd_set_file_flagsSynopsis
bfd_boolean bfd_set_file_flags (bfd *abfd, flagword flags);
Description
Set the flag word in the BFD abfd to the value flags.
Possible errors are:
bfd_error_wrong_format - The target bfd was not of object format.
bfd_error_invalid_operation - The target bfd was open for reading.
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 D_PAGED bit
on a BFD format which does not support demand paging.
bfd_get_arch_sizeSynopsis
int bfd_get_arch_size (bfd *abfd);
Description
Returns the normalized architecture address size, in bits, as
determined by the object file's format. By normalized, we mean
either 32 or 64. For ELF, this information is included in the
header. Use bfd_arch_bits_per_address for number of bits in
the architecture address.
Returns
Returns the arch size in bits if known, -1 otherwise.
bfd_get_sign_extend_vmaSynopsis
int bfd_get_sign_extend_vma (bfd *abfd);
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.
Returns
Returns 1 if the target architecture is known to sign
extend addresses, 0 if the target architecture is known to
not sign extend addresses, and -1 otherwise.
bfd_set_start_addressSynopsis
bfd_boolean bfd_set_start_address (bfd *abfd, bfd_vma vma);
Description
Make vma the entry point of output BFD abfd.
Returns
Returns TRUE on success, FALSE otherwise.
bfd_get_gp_sizeSynopsis
unsigned int bfd_get_gp_size (bfd *abfd);
Description
Return the maximum size of objects to be optimized using the GP
register under MIPS ECOFF. This is typically set by the -G
argument to the compiler, assembler or linker.
bfd_set_gp_sizeSynopsis
void bfd_set_gp_size (bfd *abfd, unsigned int i);
Description
Set the maximum size of objects to be optimized using the GP
register under ECOFF or MIPS ELF. This is typically set by
the -G argument to the compiler, assembler or linker.
bfd_scan_vmaSynopsis
bfd_vma bfd_scan_vma (const char *string, const char **end, int base);
Description
Convert, like strtoul, a numerical expression
string into a bfd_vma integer, and return that integer.
(Though without as many bells and whistles as strtoul.)
The expression is assumed to be unsigned (i.e., positive).
If given a base, it is used as the base for conversion.
A base of 0 causes the function to interpret the string
in hex if a leading "0x" or "0X" is found, otherwise
in octal if a leading zero is found, otherwise in decimal.
If the value would overflow, the maximum bfd_vma value is
returned.
bfd_copy_private_header_dataSynopsis
bfd_boolean bfd_copy_private_header_data (bfd *ibfd, bfd *obfd);
Description
Copy private BFD header information from the BFD ibfd to the
the BFD obfd. This copies information that may require
sections to exist, but does not require symbol tables. Return
true on success, false on error.
Possible error returns are:
bfd_error_no_memory -
Not enough memory exists to create private data for obfd.
#define bfd_copy_private_header_data(ibfd, obfd) \
BFD_SEND (obfd, _bfd_copy_private_header_data, \
(ibfd, obfd))
bfd_copy_private_bfd_dataSynopsis
bfd_boolean bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd);
Description
Copy private BFD information from the BFD ibfd to the
the BFD obfd. Return TRUE on success, FALSE on error.
Possible error returns are:
bfd_error_no_memory -
Not enough memory exists to create private data for obfd.
#define bfd_copy_private_bfd_data(ibfd, obfd) \
BFD_SEND (obfd, _bfd_copy_private_bfd_data, \
(ibfd, obfd))
bfd_merge_private_bfd_dataSynopsis
bfd_boolean bfd_merge_private_bfd_data (bfd *ibfd, bfd *obfd);
Description
Merge private BFD information from the BFD ibfd to the
the output file BFD obfd when linking. Return TRUE
on success, FALSE on error. Possible error returns are:
bfd_error_no_memory -
Not enough memory exists to create private data for obfd.
#define bfd_merge_private_bfd_data(ibfd, obfd) \
BFD_SEND (obfd, _bfd_merge_private_bfd_data, \
(ibfd, obfd))
bfd_set_private_flagsSynopsis
bfd_boolean bfd_set_private_flags (bfd *abfd, flagword flags);
Description
Set private BFD flag information in the BFD abfd.
Return TRUE on success, FALSE on error. Possible error
returns are:
bfd_error_no_memory -
Not enough memory exists to create private data for obfd.
#define bfd_set_private_flags(abfd, flags) \
BFD_SEND (abfd, _bfd_set_private_flags, (abfd, flags))
Other functionsDescription
The following functions exist but have not yet been documented.
#define bfd_sizeof_headers(abfd, info) \
BFD_SEND (abfd, _bfd_sizeof_headers, (abfd, info))
#define bfd_find_nearest_line(abfd, sec, syms, off, file, func, line) \
BFD_SEND (abfd, _bfd_find_nearest_line, \
(abfd, syms, sec, off, file, func, line, NULL))
#define bfd_find_nearest_line_discriminator(abfd, sec, syms, off, file, func, \
line, disc) \
BFD_SEND (abfd, _bfd_find_nearest_line, \
(abfd, syms, sec, off, file, func, line, disc))
#define bfd_find_line(abfd, syms, sym, file, line) \
BFD_SEND (abfd, _bfd_find_line, \
(abfd, syms, sym, file, line))
#define bfd_find_inliner_info(abfd, file, func, line) \
BFD_SEND (abfd, _bfd_find_inliner_info, \
(abfd, 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_lookup_section_flags(link_info, flag_info, section) \
BFD_SEND (abfd, _bfd_lookup_section_flags, (link_info, flag_info, section))
#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_add_symbols(abfd, info) \
BFD_SEND (abfd, _bfd_link_add_symbols, (abfd, info))
#define bfd_link_just_syms(abfd, 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 **);
bfd_alt_mach_codeSynopsis
bfd_boolean bfd_alt_mach_code (bfd *abfd, int alternative);
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.
bfd_emul_get_maxpagesizeSynopsis
bfd_vma bfd_emul_get_maxpagesize (const char *);
Description
Returns the maximum page size, in bytes, as determined by
emulation.
Returns
Returns the maximum page size in bytes for ELF, 0 otherwise.
bfd_emul_set_maxpagesizeSynopsis
void bfd_emul_set_maxpagesize (const char *, bfd_vma);
Description
For ELF, set the maximum page size for the emulation. It is
a no-op for other formats.
bfd_emul_get_commonpagesizeSynopsis
bfd_vma bfd_emul_get_commonpagesize (const char *);
Description
Returns the common page size, in bytes, as determined by
emulation.
Returns
Returns the common page size in bytes for ELF, 0 otherwise.
bfd_emul_set_commonpagesizeSynopsis
void bfd_emul_set_commonpagesize (const char *, bfd_vma);
Description
For ELF, set the common page size for the emulation. It is
a no-op for other formats.
bfd_demangleSynopsis
char *bfd_demangle (bfd *, const char *, int);
Description
Wrapper around cplus_demangle. Strips leading underscores and
other such chars that would otherwise confuse the demangler.
If passed a g++ v3 ABI mangled name, returns a buffer allocated
with malloc holding the demangled name. Returns NULL otherwise
and on memory alloc failure.
bfd_update_compression_headerSynopsis
void bfd_update_compression_header
(bfd *abfd, bfd_byte *contents, asection *sec);
Description
Set the compression header at CONTENTS of SEC in ABFD and update
elf_section_flags for compression.
bfd_check_compression_headerSynopsis
bfd_boolean bfd_check_compression_header
(bfd *abfd, bfd_byte *contents, asection *sec,
bfd_size_type *uncompressed_size);
Description
Check the compression header at CONTENTS of SEC in ABFD and
store the uncompressed size in UNCOMPRESSED_SIZE if the
compression header is valid.
Returns
Return TRUE if the compression header is valid.
bfd_get_compression_header_sizeSynopsis
int bfd_get_compression_header_size (bfd *abfd, asection *sec);
Description
Return the size of the compression header of SEC in ABFD.
Returns
Return the size of the compression header in bytes.
bfd_convert_section_sizeSynopsis
bfd_size_type bfd_convert_section_size
(bfd *ibfd, asection *isec, bfd *obfd, bfd_size_type size);
Description
Convert the size size of the section isec in input
BFD ibfd to the section size in output BFD obfd.
bfd_convert_section_contentsSynopsis
bfd_boolean bfd_convert_section_contents
(bfd *ibfd, asection *isec, bfd *obfd,
bfd_byte **ptr, bfd_size_type *ptr_size);
Description
Convert the contents, stored in *ptr, of the section
isec in input BFD ibfd to output BFD obfd
if needed. The original buffer pointed to by *ptr may
be freed and *ptr is returned with memory malloc'd by this
function, and the new size written to ptr_size.
struct bfd_iovecDescription
The struct bfd_iovec contains the internal file I/O class.
Each BFD has an instance of this class and all file I/O is
routed through it (it is assumed that the instance implements
all methods listed below).
struct bfd_iovec
{
/* To avoid problems with macros, a "b" rather than "f"
prefix is prepended to each method name. */
/* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching
bytes starting at PTR. Return the number of bytes actually
transfered (a read past end-of-file returns less than NBYTES),
or -1 (setting bfd_error) if an error occurs. */
file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes);
file_ptr (*bwrite) (struct bfd *abfd, const void *ptr,
file_ptr nbytes);
/* Return the current IOSTREAM file offset, or -1 (setting bfd_error
if an error occurs. */
file_ptr (*btell) (struct bfd *abfd);
/* For the following, on successful completion a value of 0 is returned.
Otherwise, a value of -1 is returned (and bfd_error is set). */
int (*bseek) (struct bfd *abfd, file_ptr offset, int whence);
int (*bclose) (struct bfd *abfd);
int (*bflush) (struct bfd *abfd);
int (*bstat) (struct bfd *abfd, struct stat *sb);
/* Mmap a part of the files. ADDR, LEN, PROT, FLAGS and OFFSET are the usual
mmap parameter, except that LEN and OFFSET do not need to be page
aligned. Returns (void *)-1 on failure, mmapped address on success.
Also write in MAP_ADDR the address of the page aligned buffer and in
MAP_LEN the size mapped (a page multiple). Use unmap with MAP_ADDR and
MAP_LEN to unmap. */
void *(*bmmap) (struct bfd *abfd, void *addr, bfd_size_type len,
int prot, int flags, file_ptr offset,
void **map_addr, bfd_size_type *map_len);
};
extern const struct bfd_iovec _bfd_memory_iovec;
bfd_get_mtimeSynopsis
long bfd_get_mtime (bfd *abfd);
Description
Return the file modification time (as read from the file system, or
from the archive header for archive members).
bfd_get_sizeSynopsis
file_ptr bfd_get_size (bfd *abfd);
Description
Return the file size (as read from file system) for the file
associated with BFD abfd.
The initial motivation for, and use of, this routine is not so we can get the exact size of the object the BFD applies to, since that might not be generally possible (archive members for example). It would be ideal if someone could eventually modify it so that such results were guaranteed.
Instead, we want to ask questions like "is this NNN byte sized
object I'm about to try read from file offset YYY reasonable?"
As as example of where we might do this, some object formats
use string tables for which the first sizeof (long) bytes of the
table contain the size of the table itself, including the size bytes.
If an application tries to read what it thinks is one of these
string tables, without some way to validate the size, and for
some reason the size is wrong (byte swapping error, wrong location
for the string table, etc.), the only clue is likely to be a read
error when it tries to read the table, or a "virtual memory
exhausted" error when it tries to allocate 15 bazillon bytes
of space for the 15 bazillon byte table it is about to read.
This function at least allows us to answer the question, "is the
size reasonable?".
bfd_mmapSynopsis
void *bfd_mmap (bfd *abfd, void *addr, bfd_size_type len,
int prot, int flags, file_ptr offset,
void **map_addr, bfd_size_type *map_len);
Description
Return mmap()ed region of the file, if possible and implemented.
LEN and OFFSET do not need to be page aligned. The page aligned
address and length are written to MAP_ADDR and MAP_LEN.