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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-06-27 15:25:38 +01:00
parent 9f4fd28eff
commit 28e2ca51a9
1 changed files with 9 additions and 2 deletions
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11
library/common.h
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@ -170,13 +170,20 @@ inline void mbedtls_xor(unsigned char *r, const unsigned char *a, const unsigned
/* *INDENT-ON* */
/*
* Define the constraint used for pointer operands to asm.
* Define the constraint used for read-only pointer operands to aarch64 asm.
*
* This is normally the usual "r", but for aarch64_32 (aka ILP32,
* as found in watchos), "p" is required to avoid warnings from clang.
*
* Note that clang does not recognise '+p' or '=p', and armclang
* does not recognise 'p' at all.
* does not recognise 'p' at all. Therefore, to update a pointer from
* aarch64 assembly, it is necessary to use something like:
*
* uintptr_t uptr = (uintptr_t) ptr;
* asm( "ldr x4, [%x0], #8" ... : "+r" (uptr) : : )
* ptr = (void*) uptr;
*
* Note that the "x" in "%x0" is neccessary; writing "%0" will cause warnings.
*/
#if defined(__aarch64__) && defined(MBEDTLS_HAVE_ASM)
#if UINTPTR_MAX == 0xfffffffful