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More GCC assembly

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Signed-off-by: Kevin Bracey <kevin.bracey@arm.com>
This commit is contained in:
Kevin Bracey 2020-10-09 12:54:28 +03:00
parent 06060330d8
commit 4aea62569b
1 changed files with 122 additions and 0 deletions
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122
tinycrypt/ecc.c
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@ -387,6 +387,68 @@ __asm uECC_word_t uECC_vli_sub(uECC_word_t *result, const uECC_word_t *left,
POP {r4-r8,pc}
#endif
}
#elif defined MBEDTLS_HAVE_ASM && defined __GNUC__ && defined __arm__
uECC_word_t uECC_vli_sub(uECC_word_t *result, const uECC_word_t *left,
const uECC_word_t *right)
{
#if NUM_ECC_WORDS != 8
#error adjust ARM assembly to handle NUM_ECC_WORDS != 8
#endif
register uECC_word_t *r0 asm ("r0") = result;
register const uECC_word_t *r1 asm ("r1") = left;
register const uECC_word_t *r2 asm ("r2") = right;
asm volatile (
#if defined __thumb__ && !defined __thumb2__
".syntax unified \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"SUBS r3,r5 \n\t"
"SBCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"SBCS r3,r5 \n\t"
"SBCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"SBCS r3,r5 \n\t"
"SBCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"SBCS r3,r5 \n\t"
"SBCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"SBCS r0,r0 \n\t" // r0 := r0 - r0 - borrow = -borrow
"RSBS r0,r0,#0 \n\t" // r0 := borrow
: "+r" (r0), "+r" (r1), "+r" (r2)
:
: "r3", "r4", "r5", "r6", "cc", "memory"
#else
"LDMIA r1!,{r3-r6} \n\t"
"LDMIA r2!,{r7,r8,r12,lr} \n\t"
"SUBS r3,r7 \n\t"
"SBCS r4,r8 \n\t"
"SBCS r5,r12 \n\t"
"SBCS r6,lr \n\t"
"STMIA r0!,{r3-r6} \n\t"
"LDMIA r1!,{r3-r6} \n\t"
"LDMIA r2!,{r7,r8,r12,lr} \n\t"
"SBCS r3,r7 \n\t"
"SBCS r4,r8 \n\t"
"SBCS r5,r12 \n\t"
"SBCS r6,lr \n\t"
"STMIA r0!,{r3-r6} \n\t"
"SBCS r0,r0 \n\t" // r0 := r0 - r0 - borrow = -borrow
"RSBS r0,r0,#0 \n\t" // r0 := borrow
: "+r" (r0), "+r" (r1), "+r" (r2)
:
: "r3", "r4", "r5", "r6", "r7", "r8", "r12", "lr", "cc", "memory"
#endif
);
return (uECC_word_t) r0;
}
#else
uECC_word_t uECC_vli_sub(uECC_word_t *result, const uECC_word_t *left,
const uECC_word_t *right)
@ -461,6 +523,66 @@ static __asm uECC_word_t uECC_vli_add(uECC_word_t *result, const uECC_word_t *le
POP {r4-r8,pc}
#endif
}
#elif defined MBEDTLS_HAVE_ASM && defined __GNUC__ && defined __arm__
static uECC_word_t uECC_vli_add(uECC_word_t *result, const uECC_word_t *left,
const uECC_word_t *right)
{
register uECC_word_t *r0 asm ("r0") = result;
register const uECC_word_t *r1 asm ("r1") = left;
register const uECC_word_t *r2 asm ("r2") = right;
asm volatile (
#if defined __thumb__ && !defined __thumb2__
".syntax unified \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"ADDS r3,r5 \n\t"
"ADCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"ADCS r3,r5 \n\t"
"ADCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"ADCS r3,r5 \n\t"
"ADCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"LDMIA r1!,{r3,r4} \n\t"
"LDMIA r2!,{r5,r6} \n\t"
"ADCS r3,r5 \n\t"
"ADCS r4,r6 \n\t"
"STMIA r0!,{r3,r4} \n\t"
"MOVS r0,#0 \n\t" // does not affect C flag
"ADCS r0,r0 \n\t" // r0 := 0 + 0 + C = carry
: "+r" (r0), "+r" (r1), "+r" (r2)
:
: "r3", "r4", "r5", "r6", "cc", "memory"
#else
"LDMIA r1!,{r3-r6} \n\t"
"LDMIA r2!,{r7,r8,r12,lr} \n\t"
"ADDS r3,r7 \n\t"
"ADCS r4,r8 \n\t"
"ADCS r5,r12 \n\t"
"ADCS r6,lr \n\t"
"STMIA r0!,{r3-r6} \n\t"
"LDMIA r1!,{r3-r6} \n\t"
"LDMIA r2!,{r7,r8,r12,lr} \n\t"
"ADCS r3,r7 \n\t"
"ADCS r4,r8 \n\t"
"ADCS r5,r12 \n\t"
"ADCS r6,lr \n\t"
"STMIA r0!,{r3-r6} \n\t"
"MOVS r0,#0 \n\t" // does not affect C flag
"ADCS r0,r0 \n\t" // r0 := 0 + 0 + C = carry
: "+r" (r0), "+r" (r1), "+r" (r2)
:
: "r3", "r4", "r5", "r6", "r7", "r8", "r12", "lr", "cc", "memory"
#endif
);
return (uECC_word_t) r0;
}
#else
static uECC_word_t uECC_vli_add(uECC_word_t *result, const uECC_word_t *left,
const uECC_word_t *right)