Detect support for unaligned memory access
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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1 changed files with 19 additions and 0 deletions
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@ -69,6 +69,18 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
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*/
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#define MBEDTLS_ALLOW_PRIVATE_ACCESS
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/** Detect architectures where unaligned memory accesses are safe and performant.
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*
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* This list is incomplete.
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*/
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#if defined(__i386__) || defined(__amd64__) || defined( __x86_64__) \
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|| defined(__ARM_FEATURE_UNALIGNED) \
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|| defined(__aarch64__) \
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|| defined(__ARM_ARCH_8__) || defined(__ARM_ARCH_8A__) || defined(__ARM_ARCH_8M__) \
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|| defined(__ARM_ARCH_7A__)
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#define MBEDTLS_ALLOW_UNALIGNED_ACCESS
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#endif
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/** Byte Reading Macros
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*
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* Given a multi-byte integer \p x, MBEDTLS_BYTE_n retrieves the n-th
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@ -404,6 +416,7 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
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*/
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static inline void mbedtls_xor( unsigned char* r, unsigned char const *a, unsigned char const *b, size_t n )
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{
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#if defined(MBEDTLS_ALLOW_UNALIGNED_ACCESS)
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uint32_t *a32 = (uint32_t*)a;
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uint32_t *b32 = (uint32_t*)b;
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uint32_t *r32 = (uint32_t*)r;
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@ -415,6 +428,12 @@ static inline void mbedtls_xor( unsigned char* r, unsigned char const *a, unsign
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{
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r[i] = a[i] ^ b[i];
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}
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#else
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for ( size_t i = 0; i < n; i++ )
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{
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r[i] = a[i] ^ b[i];
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}
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#endif
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}
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/* Fix MSVC C99 compatible issue
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