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Add GCC vli_rshift1 assembly

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Signed-off-by: Kevin Bracey <kevin.bracey@arm.com>
This commit is contained in:
Kevin Bracey 2020-10-02 17:43:12 +03:00
parent 0a1884bba4
commit 06060330d8
1 changed files with 26 additions and 0 deletions
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26
tinycrypt/ecc.c
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@ -525,6 +525,32 @@ static __asm void uECC_vli_rshift1(uECC_word_t *vli)
BX lr
#endif
}
#elif defined MBEDTLS_HAVE_ASM && defined __GNUC__ && defined __arm__ && defined __thumb2__
static void uECC_vli_rshift1(uECC_word_t *vli)
{
register uECC_word_t *r0 asm ("r0") = vli;
#if NUM_ECC_WORDS != 8
#error adjust ARM assembly to handle NUM_ECC_WORDS != 8
#endif
asm volatile (
"ADDS r0,#32 \n\t"
"LDMDB r0,{r1-r3,ip} \n\t"
"LSRS ip,ip,#1 \n\t"
"RRXS r3,r3 \n\t"
"RRXS r2,r2 \n\t"
"RRXS r1,r1 \n\t"
"STMDB r0!,{r1-r3,ip} \n\t"
"LDMDB r0,{r1-r3,ip} \n\t"
"RRXS ip,ip \n\t"
"RRXS r3,r3 \n\t"
"RRXS r2,r2 \n\t"
"RRX r1,r1 \n\t"
"STMDB r0!,{r1-r3,ip} \n\t"
: "+r" (r0)
:
: "r1", "r2", "r3", "ip", "cc", "memory"
);
}
#else
static void uECC_vli_rshift1(uECC_word_t *vli)
{