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Detect support for unaligned memory access

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2022-11-22 18:55:17 +00:00
parent 8c18baf8c1
commit fdd967ebdc
1 changed files with 19 additions and 0 deletions
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19
library/common.h
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@@ -69,6 +69,18 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
*/ */
#define MBEDTLS_ALLOW_PRIVATE_ACCESS #define MBEDTLS_ALLOW_PRIVATE_ACCESS
/** Detect architectures where unaligned memory accesses are safe and performant.
*
* This list is incomplete.
*/
#if defined(__i386__) || defined(__amd64__) || defined( __x86_64__) \
|| defined(__ARM_FEATURE_UNALIGNED) \
|| defined(__aarch64__) \
|| defined(__ARM_ARCH_8__) || defined(__ARM_ARCH_8A__) || defined(__ARM_ARCH_8M__) \
|| defined(__ARM_ARCH_7A__)
#define MBEDTLS_ALLOW_UNALIGNED_ACCESS
#endif
/** Byte Reading Macros /** Byte Reading Macros
* *
* Given a multi-byte integer \p x, MBEDTLS_BYTE_n retrieves the n-th * Given a multi-byte integer \p x, MBEDTLS_BYTE_n retrieves the n-th
@@ -404,6 +416,7 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
*/ */
static inline void mbedtls_xor( unsigned char* r, unsigned char const *a, unsigned char const *b, size_t n ) static inline void mbedtls_xor( unsigned char* r, unsigned char const *a, unsigned char const *b, size_t n )
{ {
#if defined(MBEDTLS_ALLOW_UNALIGNED_ACCESS)
uint32_t *a32 = (uint32_t*)a; uint32_t *a32 = (uint32_t*)a;
uint32_t *b32 = (uint32_t*)b; uint32_t *b32 = (uint32_t*)b;
uint32_t *r32 = (uint32_t*)r; uint32_t *r32 = (uint32_t*)r;
@@ -415,6 +428,12 @@ static inline void mbedtls_xor( unsigned char* r, unsigned char const *a, unsign
{ {
r[i] = a[i] ^ b[i]; r[i] = a[i] ^ b[i];
} }
#else
for ( size_t i = 0; i < n; i++ )
{
r[i] = a[i] ^ b[i];
}
#endif
} }
/* Fix MSVC C99 compatible issue /* Fix MSVC C99 compatible issue