diff options
Diffstat (limited to 'src/arch/x86/include/bits/bigint.h')
| -rw-r--r-- | src/arch/x86/include/bits/bigint.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/arch/x86/include/bits/bigint.h b/src/arch/x86/include/bits/bigint.h index 5580030ee..4026ca481 100644 --- a/src/arch/x86/include/bits/bigint.h +++ b/src/arch/x86/include/bits/bigint.h @@ -52,8 +52,9 @@ bigint_init_raw ( uint32_t *value0, unsigned int size, * @v addend0 Element 0 of big integer to add * @v value0 Element 0 of big integer to be added to * @v size Number of elements + * @ret carry Carry flag */ -static inline __attribute__ (( always_inline )) void +static inline __attribute__ (( always_inline )) int bigint_add_raw ( const uint32_t *addend0, uint32_t *value0, unsigned int size ) { bigint_t ( size ) __attribute__ (( may_alias )) *value = @@ -61,17 +62,20 @@ bigint_add_raw ( const uint32_t *addend0, uint32_t *value0, long index; void *discard_S; long discard_c; + int carry; __asm__ __volatile__ ( "xor %0, %0\n\t" /* Zero %0 and clear CF */ "\n1:\n\t" "lodsl\n\t" - "adcl %%eax, (%4,%0,4)\n\t" + "adcl %%eax, (%5,%0,4)\n\t" "inc %0\n\t" /* Does not affect CF */ "loop 1b\n\t" : "=&r" ( index ), "=&S" ( discard_S ), - "=&c" ( discard_c ), "+m" ( *value ) + "=&c" ( discard_c ), "=@ccc" ( carry ), + "+m" ( *value ) : "r" ( value0 ), "1" ( addend0 ), "2" ( size ) : "eax" ); + return carry; } /** @@ -80,8 +84,9 @@ bigint_add_raw ( const uint32_t *addend0, uint32_t *value0, * @v subtrahend0 Element 0 of big integer to subtract * @v value0 Element 0 of big integer to be subtracted from * @v size Number of elements + * @ret borrow Borrow flag */ -static inline __attribute__ (( always_inline )) void +static inline __attribute__ (( always_inline )) int bigint_subtract_raw ( const uint32_t *subtrahend0, uint32_t *value0, unsigned int size ) { bigint_t ( size ) __attribute__ (( may_alias )) *value = @@ -89,18 +94,21 @@ bigint_subtract_raw ( const uint32_t *subtrahend0, uint32_t *value0, long index; void *discard_S; long discard_c; + int borrow; __asm__ __volatile__ ( "xor %0, %0\n\t" /* Zero %0 and clear CF */ "\n1:\n\t" "lodsl\n\t" - "sbbl %%eax, (%4,%0,4)\n\t" + "sbbl %%eax, (%5,%0,4)\n\t" "inc %0\n\t" /* Does not affect CF */ "loop 1b\n\t" : "=&r" ( index ), "=&S" ( discard_S ), - "=&c" ( discard_c ), "+m" ( *value ) + "=&c" ( discard_c ), "=@ccc" ( borrow ), + "+m" ( *value ) : "r" ( value0 ), "1" ( subtrahend0 ), "2" ( size ) : "eax" ); + return borrow; } /** |