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| author | Dickon Hood <dickon.hood@codethink.co.uk> | 2023-04-28 15:47:46 +0100 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2023-05-02 12:36:46 -0700 |
| commit | 8841c815a93a2da3e60fb8173d9c5dc01f552dab (patch) | |
| tree | 0ebf6cb98461c94cc35c3473509ca30bb0e2971f /include/qemu | |
| parent | ac01ec6fe59458978b32624a6e93b5f2e55b593f (diff) | |
| download | qemu-8841c815a93a2da3e60fb8173d9c5dc01f552dab.zip qemu-8841c815a93a2da3e60fb8173d9c5dc01f552dab.tar.gz qemu-8841c815a93a2da3e60fb8173d9c5dc01f552dab.tar.bz2 | |
qemu/bitops.h: Limit rotate amounts
Rotates have been fixed up to only allow for reasonable rotate amounts
(ie, no rotates >7 on an 8b value etc.) This fixes a problem with riscv
vector rotate instructions.
Signed-off-by: Dickon Hood <dickon.hood@codethink.co.uk>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230428144757.57530-9-lawrence.hunter@codethink.co.uk>
[rth: Mask shifts in both directions.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'include/qemu')
| -rw-r--r-- | include/qemu/bitops.h | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 03213ce..cb3526d 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -218,7 +218,7 @@ static inline unsigned long find_first_zero_bit(const unsigned long *addr, */ static inline uint8_t rol8(uint8_t word, unsigned int shift) { - return (word << shift) | (word >> ((8 - shift) & 7)); + return (word << (shift & 7)) | (word >> (-shift & 7)); } /** @@ -228,7 +228,7 @@ static inline uint8_t rol8(uint8_t word, unsigned int shift) */ static inline uint8_t ror8(uint8_t word, unsigned int shift) { - return (word >> shift) | (word << ((8 - shift) & 7)); + return (word >> (shift & 7)) | (word << (-shift & 7)); } /** @@ -238,7 +238,7 @@ static inline uint8_t ror8(uint8_t word, unsigned int shift) */ static inline uint16_t rol16(uint16_t word, unsigned int shift) { - return (word << shift) | (word >> ((16 - shift) & 15)); + return (word << (shift & 15)) | (word >> (-shift & 15)); } /** @@ -248,7 +248,7 @@ static inline uint16_t rol16(uint16_t word, unsigned int shift) */ static inline uint16_t ror16(uint16_t word, unsigned int shift) { - return (word >> shift) | (word << ((16 - shift) & 15)); + return (word >> (shift & 15)) | (word << (-shift & 15)); } /** @@ -258,7 +258,7 @@ static inline uint16_t ror16(uint16_t word, unsigned int shift) */ static inline uint32_t rol32(uint32_t word, unsigned int shift) { - return (word << shift) | (word >> ((32 - shift) & 31)); + return (word << (shift & 31)) | (word >> (-shift & 31)); } /** @@ -268,7 +268,7 @@ static inline uint32_t rol32(uint32_t word, unsigned int shift) */ static inline uint32_t ror32(uint32_t word, unsigned int shift) { - return (word >> shift) | (word << ((32 - shift) & 31)); + return (word >> (shift & 31)) | (word << (-shift & 31)); } /** @@ -278,7 +278,7 @@ static inline uint32_t ror32(uint32_t word, unsigned int shift) */ static inline uint64_t rol64(uint64_t word, unsigned int shift) { - return (word << shift) | (word >> ((64 - shift) & 63)); + return (word << (shift & 63)) | (word >> (-shift & 63)); } /** @@ -288,7 +288,7 @@ static inline uint64_t rol64(uint64_t word, unsigned int shift) */ static inline uint64_t ror64(uint64_t word, unsigned int shift) { - return (word >> shift) | (word << ((64 - shift) & 63)); + return (word >> (shift & 63)) | (word << (-shift & 63)); } /** |