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| <a name="Implementation-details"></a> |
| <h3 class="section">2.15 Implementation details</h3> |
| |
| |
| <a name="Internal-functions"></a> |
| <h4 class="subsection">2.15.1 Internal functions</h4> |
| |
| |
| <p><strong>Description</strong><br> |
| These routines are used within BFD. |
| They are not intended for export, but are documented here for |
| completeness. |
| </p> |
| <a name="index-bfd_005fwrite_005fbigendian_005f4byte_005fint"></a> |
| <a name="bfd_005fwrite_005fbigendian_005f4byte_005fint"></a> |
| <h4 class="subsubsection">2.15.1.1 <code>bfd_write_bigendian_4byte_int</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_write_bigendian_4byte_int (bfd *, unsigned int); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Write a 4 byte integer <var>i</var> to the output BFD <var>abfd</var>, in big |
| endian order regardless of what else is going on. This is useful in |
| archives. |
| </p> |
| <a name="index-bfd_005fput_005fsize"></a> |
| <a name="bfd_005fput_005fsize"></a> |
| <h4 class="subsubsection">2.15.1.2 <code>bfd_put_size</code></h4> |
| <a name="index-bfd_005fget_005fsize-1"></a> |
| <a name="bfd_005fget_005fsize-1"></a> |
| <h4 class="subsubsection">2.15.1.3 <code>bfd_get_size</code></h4> |
| <p><strong>Description</strong><br> |
| 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, <samp>libaout.h</samp> defines <code>GET_WORD</code> |
| to either <code>bfd_get_32</code> or <code>bfd_get_64</code>. |
| </p> |
| <p>In the put routines, <var>val</var> must be a <code>bfd_vma</code>. 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</code> |
| or <code>gcc -Wall</code> from detecting sins such as passing a pointer. |
| To detect calling these with less than a <code>bfd_vma</code>, use |
| <code>gcc -Wconversion</code> on a host with 64 bit <code>bfd_vma</code>’s. |
| </p><div class="example"> |
| <pre class="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) \ |
| (*(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_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)) |
| |
| </pre></div> |
| |
| <a name="index-bfd_005fh_005fput_005fsize"></a> |
| <a name="bfd_005fh_005fput_005fsize"></a> |
| <h4 class="subsubsection">2.15.1.4 <code>bfd_h_put_size</code></h4> |
| <p><strong>Description</strong><br> |
| These macros have the same function as their <code>bfd_get_x</code> |
| 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. |
| </p><div class="example"> |
| <pre class="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 |
| |
| |
| </pre></div> |
| |
| <a name="index-bfd_005flog2"></a> |
| <a name="bfd_005flog2"></a> |
| <h4 class="subsubsection">2.15.1.5 <code>bfd_log2</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">unsigned int bfd_log2 (bfd_vma x); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Return the log base 2 of the value supplied, rounded up. E.g., an |
| <var>x</var> of 1025 returns 11. A <var>x</var> of 0 returns 0. |
| </p> |
| |
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