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| author | Michael Brown <mcb30@ipxe.org> | 2025-02-13 14:18:15 +0000 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2025-02-13 15:25:35 +0000 |
| commit | 5056e8ad936742ba410031cff14c0f72d87805fc (patch) | |
| tree | 843fe48d0e4eeea4d78e4c30e31c16268def5ff3 /src/arch/loong64/include/bits/bigint.h | |
| parent | bd90abf487a6b0500f457193f86ff54fd2be3143 (diff) | |
| download | ipxe-5056e8ad936742ba410031cff14c0f72d87805fc.tar.gz | |
[crypto] Expose shifted out bit from big integer shifts
Expose the bit shifted out as a result of shifting a big integer left
or right.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/loong64/include/bits/bigint.h')
| -rw-r--r-- | src/arch/loong64/include/bits/bigint.h | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/src/arch/loong64/include/bits/bigint.h b/src/arch/loong64/include/bits/bigint.h index 0222354df..6a879503a 100644 --- a/src/arch/loong64/include/bits/bigint.h +++ b/src/arch/loong64/include/bits/bigint.h @@ -144,26 +144,27 @@ bigint_subtract_raw ( const uint64_t *subtrahend0, uint64_t *value0, * * @v value0 Element 0 of big integer * @v size Number of elements + * @ret out Bit shifted out */ -static inline __attribute__ (( always_inline )) void +static inline __attribute__ (( always_inline )) int bigint_shl_raw ( uint64_t *value0, unsigned int size ) { bigint_t ( size ) __attribute__ (( may_alias )) *value = ( ( void * ) value0 ); uint64_t *discard_value; uint64_t discard_value_i; - uint64_t discard_carry; uint64_t discard_temp; unsigned int discard_size; + uint64_t carry; __asm__ __volatile__ ( "\n1:\n\t" /* Load value[i] */ "ld.d %2, %0, 0\n\t" /* Shift left */ "rotri.d %2, %2, 63\n\t" - "andi %4, %2, 1\n\t" - "xor %2, %2, %4\n\t" - "or %2, %2, %3\n\t" - "move %3, %4\n\t" + "andi %3, %2, 1\n\t" + "xor %2, %2, %3\n\t" + "or %2, %2, %4\n\t" + "move %4, %3\n\t" /* Store value[i] */ "st.d %2, %0, 0\n\t" /* Loop */ @@ -173,11 +174,12 @@ bigint_shl_raw ( uint64_t *value0, unsigned int size ) { : "=r" ( discard_value ), "=r" ( discard_size ), "=r" ( discard_value_i ), - "=r" ( discard_carry ), "=r" ( discard_temp ), + "=r" ( carry ), "+m" ( *value ) - : "0" ( value0 ), "1" ( size ), "3" ( 0 ) + : "0" ( value0 ), "1" ( size ), "4" ( 0 ) : "cc" ); + return ( carry & 1 ); } /** @@ -185,25 +187,26 @@ bigint_shl_raw ( uint64_t *value0, unsigned int size ) { * * @v value0 Element 0 of big integer * @v size Number of elements + * @ret out Bit shifted out */ -static inline __attribute__ (( always_inline )) void +static inline __attribute__ (( always_inline )) int bigint_shr_raw ( uint64_t *value0, unsigned int size ) { bigint_t ( size ) __attribute__ (( may_alias )) *value = ( ( void * ) value0 ); uint64_t *discard_value; uint64_t discard_value_i; - uint64_t discard_carry; uint64_t discard_temp; unsigned int discard_size; + uint64_t carry; __asm__ __volatile__ ( "\n1:\n\t" /* Load value[i] */ "ld.d %2, %0, -8\n\t" /* Shift right */ - "andi %4, %2, 1\n\t" - "xor %2, %2, %4\n\t" - "or %2, %2, %3\n\t" - "move %3, %4\n\t" + "andi %3, %2, 1\n\t" + "xor %2, %2, %3\n\t" + "or %2, %2, %4\n\t" + "move %4, %3\n\t" "rotri.d %2, %2, 1\n\t" /* Store value[i] */ "st.d %2, %0, -8\n\t" @@ -214,11 +217,12 @@ bigint_shr_raw ( uint64_t *value0, unsigned int size ) { : "=r" ( discard_value ), "=r" ( discard_size ), "=r" ( discard_value_i ), - "=r" ( discard_carry ), "=r" ( discard_temp ), + "=r" ( carry ), "+m" ( *value ) - : "0" ( value0 + size ), "1" ( size ), "3" ( 0 ) + : "0" ( value0 + size ), "1" ( size ), "4" ( 0 ) : "cc" ); + return ( carry & 1 ); } /** |