mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 23:32:06 +00:00
180 lines
5.8 KiB
Plaintext
180 lines
5.8 KiB
Plaintext
@section Implementation details
|
|
|
|
|
|
@subsection Internal functions
|
|
|
|
|
|
@strong{Description}@*
|
|
These routines are used within BFD.
|
|
They are not intended for export, but are documented here for
|
|
completeness.
|
|
|
|
@findex bfd_write_bigendian_4byte_int
|
|
@subsubsection @code{bfd_write_bigendian_4byte_int}
|
|
@strong{Synopsis}
|
|
@example
|
|
bfd_boolean bfd_write_bigendian_4byte_int (bfd *, unsigned int);
|
|
@end example
|
|
@strong{Description}@*
|
|
Write a 4 byte integer @var{i} to the output BFD @var{abfd}, in big
|
|
endian order regardless of what else is going on. This is useful in
|
|
archives.
|
|
|
|
@findex bfd_put_size
|
|
@subsubsection @code{bfd_put_size}
|
|
@findex bfd_get_size
|
|
@subsubsection @code{bfd_get_size}
|
|
@strong{Description}@*
|
|
These macros as used for reading and writing raw data in
|
|
sections; each access (except for bytes) is vectored through
|
|
the target format of the BFD and mangled accordingly. The
|
|
mangling performs any necessary endian translations and
|
|
removes alignment restrictions. Note that types accepted and
|
|
returned by these macros are identical so they can be swapped
|
|
around in macros---for example, @file{libaout.h} defines @code{GET_WORD}
|
|
to either @code{bfd_get_32} or @code{bfd_get_64}.
|
|
|
|
In the put routines, @var{val} must be a @code{bfd_vma}. If we are on a
|
|
system without prototypes, the caller is responsible for making
|
|
sure that is true, with a cast if necessary. We don't cast
|
|
them in the macro definitions because that would prevent @code{lint}
|
|
or @code{gcc -Wall} from detecting sins such as passing a pointer.
|
|
To detect calling these with less than a @code{bfd_vma}, use
|
|
@code{gcc -Wconversion} on a host with 64 bit @code{bfd_vma}'s.
|
|
@example
|
|
|
|
/* Byte swapping macros for user section data. */
|
|
|
|
#define bfd_put_8(abfd, val, ptr) \
|
|
((void) (*((unsigned char *) (ptr)) = (val) & 0xff))
|
|
#define bfd_put_signed_8 \
|
|
bfd_put_8
|
|
#define bfd_get_8(abfd, ptr) \
|
|
(*(unsigned char *) (ptr) & 0xff)
|
|
#define bfd_get_signed_8(abfd, ptr) \
|
|
(((*(unsigned char *) (ptr) & 0xff) ^ 0x80) - 0x80)
|
|
|
|
#define bfd_put_16(abfd, val, ptr) \
|
|
BFD_SEND (abfd, bfd_putx16, ((val),(ptr)))
|
|
#define bfd_put_signed_16 \
|
|
bfd_put_16
|
|
#define bfd_get_16(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_getx16, (ptr))
|
|
#define bfd_get_signed_16(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_getx_signed_16, (ptr))
|
|
|
|
#define bfd_put_32(abfd, val, ptr) \
|
|
BFD_SEND (abfd, bfd_putx32, ((val),(ptr)))
|
|
#define bfd_put_signed_32 \
|
|
bfd_put_32
|
|
#define bfd_get_32(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_getx32, (ptr))
|
|
#define bfd_get_signed_32(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_getx_signed_32, (ptr))
|
|
|
|
#define bfd_put_64(abfd, val, ptr) \
|
|
BFD_SEND (abfd, bfd_putx64, ((val), (ptr)))
|
|
#define bfd_put_signed_64 \
|
|
bfd_put_64
|
|
#define bfd_get_64(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_getx64, (ptr))
|
|
#define bfd_get_signed_64(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_getx_signed_64, (ptr))
|
|
|
|
#define bfd_get(bits, abfd, ptr) \
|
|
((bits) == 8 ? (bfd_vma) bfd_get_8 (abfd, ptr) \
|
|
: (bits) == 16 ? bfd_get_16 (abfd, ptr) \
|
|
: (bits) == 32 ? bfd_get_32 (abfd, ptr) \
|
|
: (bits) == 64 ? bfd_get_64 (abfd, ptr) \
|
|
: (abort (), (bfd_vma) - 1))
|
|
|
|
#define bfd_put(bits, abfd, val, ptr) \
|
|
((bits) == 8 ? bfd_put_8 (abfd, val, ptr) \
|
|
: (bits) == 16 ? bfd_put_16 (abfd, val, ptr) \
|
|
: (bits) == 32 ? bfd_put_32 (abfd, val, ptr) \
|
|
: (bits) == 64 ? bfd_put_64 (abfd, val, ptr) \
|
|
: (abort (), (void) 0))
|
|
|
|
@end example
|
|
|
|
@findex bfd_h_put_size
|
|
@subsubsection @code{bfd_h_put_size}
|
|
@strong{Description}@*
|
|
These macros have the same function as their @code{bfd_get_x}
|
|
brethren, except that they are used for removing information
|
|
for the header records of object files. Believe it or not,
|
|
some object files keep their header records in big endian
|
|
order and their data in little endian order.
|
|
@example
|
|
|
|
/* Byte swapping macros for file header data. */
|
|
|
|
#define bfd_h_put_8(abfd, val, ptr) \
|
|
bfd_put_8 (abfd, val, ptr)
|
|
#define bfd_h_put_signed_8(abfd, val, ptr) \
|
|
bfd_put_8 (abfd, val, ptr)
|
|
#define bfd_h_get_8(abfd, ptr) \
|
|
bfd_get_8 (abfd, ptr)
|
|
#define bfd_h_get_signed_8(abfd, ptr) \
|
|
bfd_get_signed_8 (abfd, ptr)
|
|
|
|
#define bfd_h_put_16(abfd, val, ptr) \
|
|
BFD_SEND (abfd, bfd_h_putx16, (val, ptr))
|
|
#define bfd_h_put_signed_16 \
|
|
bfd_h_put_16
|
|
#define bfd_h_get_16(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_h_getx16, (ptr))
|
|
#define bfd_h_get_signed_16(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_h_getx_signed_16, (ptr))
|
|
|
|
#define bfd_h_put_32(abfd, val, ptr) \
|
|
BFD_SEND (abfd, bfd_h_putx32, (val, ptr))
|
|
#define bfd_h_put_signed_32 \
|
|
bfd_h_put_32
|
|
#define bfd_h_get_32(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_h_getx32, (ptr))
|
|
#define bfd_h_get_signed_32(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_h_getx_signed_32, (ptr))
|
|
|
|
#define bfd_h_put_64(abfd, val, ptr) \
|
|
BFD_SEND (abfd, bfd_h_putx64, (val, ptr))
|
|
#define bfd_h_put_signed_64 \
|
|
bfd_h_put_64
|
|
#define bfd_h_get_64(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_h_getx64, (ptr))
|
|
#define bfd_h_get_signed_64(abfd, ptr) \
|
|
BFD_SEND (abfd, bfd_h_getx_signed_64, (ptr))
|
|
|
|
/* Aliases for the above, which should eventually go away. */
|
|
|
|
#define H_PUT_64 bfd_h_put_64
|
|
#define H_PUT_32 bfd_h_put_32
|
|
#define H_PUT_16 bfd_h_put_16
|
|
#define H_PUT_8 bfd_h_put_8
|
|
#define H_PUT_S64 bfd_h_put_signed_64
|
|
#define H_PUT_S32 bfd_h_put_signed_32
|
|
#define H_PUT_S16 bfd_h_put_signed_16
|
|
#define H_PUT_S8 bfd_h_put_signed_8
|
|
#define H_GET_64 bfd_h_get_64
|
|
#define H_GET_32 bfd_h_get_32
|
|
#define H_GET_16 bfd_h_get_16
|
|
#define H_GET_8 bfd_h_get_8
|
|
#define H_GET_S64 bfd_h_get_signed_64
|
|
#define H_GET_S32 bfd_h_get_signed_32
|
|
#define H_GET_S16 bfd_h_get_signed_16
|
|
#define H_GET_S8 bfd_h_get_signed_8
|
|
|
|
|
|
@end example
|
|
|
|
@findex bfd_log2
|
|
@subsubsection @code{bfd_log2}
|
|
@strong{Synopsis}
|
|
@example
|
|
unsigned int bfd_log2 (bfd_vma x);
|
|
@end example
|
|
@strong{Description}@*
|
|
Return the log base 2 of the value supplied, rounded up. E.g., an
|
|
@var{x} of 1025 returns 11. A @var{x} of 0 returns 0.
|
|
|