bfd: Internal
2.15 Implementation details
===========================
2.15.1 Internal functions
-------------------------
*Description*
These routines are used within BFD. They are not intended for export,
but are documented here for completeness.
2.15.1.1 'bfd_write_bigendian_4byte_int'
........................................
*Synopsis*
bfd_boolean bfd_write_bigendian_4byte_int (bfd *, unsigned int);
*Description*
Write a 4 byte integer I to the output BFD ABFD, in big endian order
regardless of what else is going on. This is useful in archives.
2.15.1.2 'bfd_put_size'
.......................
2.15.1.3 'bfd_get_size'
.......................
*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, 'libaout.h' defines 'GET_WORD' to
either 'bfd_get_32' or 'bfd_get_64'.
In the put routines, VAL must be a '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 'lint' or 'gcc -Wall' from
detecting sins such as passing a pointer. To detect calling these with
less than a 'bfd_vma', use 'gcc -Wconversion' on a host with 64 bit
'bfd_vma''s.
/* 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) \
(*(const unsigned char *) (ptr) & 0xff)
#define bfd_get_signed_8(abfd, ptr) \
(((*(const 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_24(abfd, val, ptr) \
do \
if (bfd_big_endian (abfd)) \
bfd_putb24 ((val), (ptr)); \
else \
bfd_putl24 ((val), (ptr)); \
while (0)
bfd_vma bfd_getb24 (const void *p);
bfd_vma bfd_getl24 (const void *p);
#define bfd_get_24(abfd, ptr) \
(bfd_big_endian (abfd) ? bfd_getb24 (ptr) : bfd_getl24 (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))
2.15.1.4 'bfd_h_put_size'
.........................
*Description*
These macros have the same function as their '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.
/* 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
2.15.1.5 'bfd_log2'
...................
*Synopsis*
unsigned int bfd_log2 (bfd_vma x);
*Description*
Return the log base 2 of the value supplied, rounded up. E.g., an X of
1025 returns 11. A X of 0 returns 0.
Info Catalog
bfd: Opening and Closing
bfd: BFD front end
bfd: File Caching