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Define UNALIGNED_UINT32_PTR for unaligned access

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2022-11-23 19:14:26 +00:00
parent a6778013b4
commit e7cd137606
1 changed files with 19 additions and 12 deletions
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31
library/common.h
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@ -74,22 +74,29 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
*/
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
/** Detect architectures where unaligned memory accesses are safe and performant.
/** MBEDTLS_ALLOW_UNALIGNED_ACCESS is defined for architectures where unaligned
* memory accesses are safe and performant.
*
* Unaligned accesses must be made via the UNALIGNED_UINT32_PTR type
* defined here.
*
* This list is incomplete.
*/
#if defined(__has_feature)
#if __has_feature(undefined_behavior_sanitizer)
#define MBEDTLS_HAVE_UBSAN
#endif
#endif
#if (defined(__i386__) || defined(__amd64__) || defined( __x86_64__) \
#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__)) && !defined(MBEDTLS_HAVE_UBSAN)
|| defined(__ARM_ARCH_7A__)
#if (defined(__GNUC__) && __GNUC__ >= 4) \
|| (defined(__clang__) && __has_attribute(aligned)) \
|| (defined(__ARMCC_VERSION) && __ARMCC_VERSION >= 5000000 )
#define MBEDTLS_ALLOW_UNALIGNED_ACCESS
__attribute__((aligned(1))) typedef uint32_t unaligned_uint32_t;
#define UNALIGNED_UINT32_PTR unaligned_uint32_t
#elif defined(_MSC_VER)
#define MBEDTLS_ALLOW_UNALIGNED_ACCESS
#define UNALIGNED_UINT32_PTR __declspec(align(1)) uint32_t
#endif
#endif
/** Byte Reading Macros
@ -428,9 +435,9 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
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 *b32 = (uint32_t *)b;
uint32_t *r32 = (uint32_t *)r;
UNALIGNED_UINT32_PTR *a32 = (uint32_t *)a;
UNALIGNED_UINT32_PTR *b32 = (uint32_t *)b;
UNALIGNED_UINT32_PTR *r32 = (uint32_t *)r;
for ( size_t i = 0; i < ( n >> 2 ); i++ )
{
r32[i] = a32[i] ^ b32[i];