diff options
Diffstat (limited to 'src/arch/arm64/include/bits/bigint.h')
| -rw-r--r-- | src/arch/arm64/include/bits/bigint.h | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/src/arch/arm64/include/bits/bigint.h b/src/arch/arm64/include/bits/bigint.h index 50493499e..5f79dc0c3 100644 --- a/src/arch/arm64/include/bits/bigint.h +++ b/src/arch/arm64/include/bits/bigint.h @@ -43,8 +43,9 @@ bigint_init_raw ( uint64_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 out */ -static inline __attribute__ (( always_inline )) void +static inline __attribute__ (( always_inline )) int bigint_add_raw ( const uint64_t *addend0, uint64_t *value0, unsigned int size ) { bigint_t ( size ) __attribute__ (( may_alias )) *value = @@ -54,6 +55,7 @@ bigint_add_raw ( const uint64_t *addend0, uint64_t *value0, uint64_t discard_addend_i; uint64_t discard_value_i; unsigned int discard_size; + int carry; __asm__ __volatile__ ( "cmn xzr, xzr\n\t" /* clear CF */ "\n1:\n\t" @@ -68,9 +70,11 @@ bigint_add_raw ( const uint64_t *addend0, uint64_t *value0, "=r" ( discard_size ), "=r" ( discard_addend_i ), "=r" ( discard_value_i ), + "=@cccs" ( carry ), "+m" ( *value ) - : "0" ( addend0 ), "1" ( value0 ), "2" ( size ) - : "cc" ); + : "0" ( addend0 ), "1" ( value0 ), + "2" ( size ) ); + return carry; } /** @@ -79,8 +83,9 @@ bigint_add_raw ( const uint64_t *addend0, uint64_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 out */ -static inline __attribute__ (( always_inline )) void +static inline __attribute__ (( always_inline )) int bigint_subtract_raw ( const uint64_t *subtrahend0, uint64_t *value0, unsigned int size ) { bigint_t ( size ) __attribute__ (( may_alias )) *value = @@ -90,6 +95,7 @@ bigint_subtract_raw ( const uint64_t *subtrahend0, uint64_t *value0, uint64_t discard_subtrahend_i; uint64_t discard_value_i; unsigned int discard_size; + int borrow; __asm__ __volatile__ ( "cmp xzr, xzr\n\t" /* set CF */ "\n1:\n\t" @@ -104,10 +110,11 @@ bigint_subtract_raw ( const uint64_t *subtrahend0, uint64_t *value0, "=r" ( discard_size ), "=r" ( discard_subtrahend_i ), "=r" ( discard_value_i ), + "=@cccc" ( borrow ), "+m" ( *value ) : "0" ( subtrahend0 ), "1" ( value0 ), - "2" ( size ) - : "cc" ); + "2" ( size ) ); + return borrow; } /** |