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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>
master
Dickon Hood 2023-04-28 15:47:46 +01:00 committed by Richard Henderson
parent ac01ec6fe5
commit 8841c815a9
1 changed files with 8 additions and 8 deletions
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16
include/qemu/bitops.h
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@ -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));
}
/**