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tls: P256: tweak arm assembly (currently disabled)

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-10-06 16:10:49 +02:00
parent d74993d31d
commit 22fd8fd3f4
1 changed files with 88 additions and 87 deletions
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175
networking/tls_sp_c32.c
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@ -393,7 +393,7 @@ static void sp_256_mul_8(sp_digit* r, const sp_digit* a, const sp_digit* b)
"\n subs r3, r5, #28"
"\n movcc r3, #0"
"\n sub r4, r5, r3"
"\n 2:"
"\n 2:"
"\n ldr r14, [%[a], r3]"
"\n ldr r12, [%[b], r4]"
"\n umull r9, r10, r14, r12"
@ -416,7 +416,7 @@ static void sp_256_mul_8(sp_digit* r, const sp_digit* a, const sp_digit* b)
"\n ble 1b"
"\n str r6, [%[r], r5]"
: [r] "r" (tmp), [a] "r" (a), [b] "r" (b)
: "memory", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r14", "r12"
: "memory", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r12", "r14"
);
memcpy(r, tmp, sizeof(tmp));
#else
@ -732,97 +732,98 @@ static void sp_256_mont_reduce_8(sp_digit* a, sp_digit* m, sp_digit mp)
asm volatile (
# i = 0
mov r12, #0 # i = 0
ldr r10, [%[a], #0] # r10 = a[0]
ldr r14, [%[a], #4] # r14 = a[1]
mov r12, #0
ldr r10, [%[a], #0]
ldr r14, [%[a], #4]
1:
# mu = a[i] * mp #
mul r8, %[mp], r10 # mu = a[i] * mp
# a[i+0] += m[0] * mu #
ldr r7, [%[m], #0] # a[i+0] += m[0] * mu
ldr r9, [%[a], #0] #
umull r6, r7, r8, r7 # r7:r6 = mu * m[0]
adds r10, r10, r6 # r5:r10 += r7:r6
adc r5, r7, #0 #
# a[i+1] += m[1] * mu #
ldr r7, [%[m], #4] # a[i+1] += m[1] * mu
ldr r9, [%[a], #4] #
umull r6, r7, r8, r7 # r7:r6 = mu * m[1]
adds r10, r14, r6 # r4:r10 = r7:r14 + r7:r6
adc r4, r7, #0 #
adds r10, r10, r5 # r4:r10 += r5
adc r4, r4, #0 #
# a[i+2] += m[2] * mu #
ldr r7, [%[m], #8] # a[i+2] += m[2] * mu
ldr r14, [%[a], #8] #
umull r6, r7, r8, r7 #
adds r14, r14, r6 #
adc r5, r7, #0 #
adds r14, r14, r4 #
adc r5, r5, #0 #
# a[i+3] += m[3] * mu #
ldr r7, [%[m], #12] # a[i+3] += m[3] * mu
ldr r9, [%[a], #12] #
umull r6, r7, r8, r7 #
adds r9, r9, r6 #
adc r4, r7, #0 #
adds r9, r9, r5 #
str r9, [%[a], #12] # a[3] = r9
adc r4, r4, #0 #
# a[i+4] += m[4] * mu #
ldr r7, [%[m], #16] # a[i+4] += m[4] * mu
ldr r9, [%[a], #16] #
umull r6, r7, r8, r7 #
adds r9, r9, r6 #
adc r5, r7, #0 #
adds r9, r9, r4 #
str r9, [%[a], #16] # a[4] = r9
adc r5, r5, #0 #
# a[i+5] += m[5] * mu #
ldr r7, [%[m], #20] # a[i+5] += m[5] * mu
ldr r9, [%[a], #20] #
umull r6, r7, r8, r7 #
adds r9, r9, r6 #
adc r4, r7, #0 #
adds r9, r9, r5 #
str r9, [%[a], #20] # a[5] = r9
adc r4, r4, #0 #
# a[i+6] += m[6] * mu #
ldr r7, [%[m], #24] # a[i+6] += m[6] * mu
ldr r9, [%[a], #24] #
umull r6, r7, r8, r7 #
adds r9, r9, r6 #
adc r5, r7, #0 #
adds r9, r9, r4 #
str r9, [%[a], #24] # a[6] = r9
adc r5, r5, #0 #
# a[i+7] += m[7] * mu #
ldr r7, [%[m], #28] # a[i+7] += m[7] * mu
ldr r9, [%[a], #28] #
umull r6, r7, r8, r7 #
adds r5, r5, r6 #
adcs r7, r7, %[ca] #
mov %[ca], #0 #
adc %[ca], %[ca], %[ca] # ca = CF
adds r9, r9, r5 #
str r9, [%[a], #28] # a[7] = r9
ldr r9, [%[a], #32] # r9 = a[8]
adcs r9, r9, r7 #
str r9, [%[a], #32] # a[8] = r9
adc %[ca], %[ca], #0 # ca += CF
# i += 1 # i++
add %[a], %[a], #4 # a++
add r12, r12, #4 # i += 4
cmp r12, #32 # if (i < 32)
blt 1b # goto 1
# mu = a[i] * mp
mul r8, %[mp], r10
# a[i+0] += m[0] * mu
ldr r7, [%[m], #0]
ldr r9, [%[a], #0]
umull r6, r7, r8, r7
adds r10, r10, r6
adc r5, r7, #0
# a[i+1] += m[1] * mu
ldr r7, [%[m], #4]
ldr r9, [%[a], #4]
umull r6, r7, r8, r7
adds r10, r14, r6
adc r4, r7, #0
adds r10, r10, r5
adc r4, r4, #0
# a[i+2] += m[2] * mu
ldr r7, [%[m], #8]
ldr r14, [%[a], #8]
umull r6, r7, r8, r7
adds r14, r14, r6
adc r5, r7, #0
adds r14, r14, r4
adc r5, r5, #0
# a[i+3] += m[3] * mu
ldr r7, [%[m], #12]
ldr r9, [%[a], #12]
umull r6, r7, r8, r7
adds r9, r9, r6
adc r4, r7, #0
adds r9, r9, r5
str r9, [%[a], #12]
adc r4, r4, #0
# a[i+4] += m[4] * mu
ldr r7, [%[m], #16]
ldr r9, [%[a], #16]
umull r6, r7, r8, r7
adds r9, r9, r6
adc r5, r7, #0
adds r9, r9, r4
str r9, [%[a], #16]
adc r5, r5, #0
# a[i+5] += m[5] * mu
ldr r7, [%[m], #20]
ldr r9, [%[a], #20]
umull r6, r7, r8, r7
adds r9, r9, r6
adc r4, r7, #0
adds r9, r9, r5
str r9, [%[a], #20]
adc r4, r4, #0
# a[i+6] += m[6] * mu
ldr r7, [%[m], #24]
ldr r9, [%[a], #24]
umull r6, r7, r8, r7
adds r9, r9, r6
adc r5, r7, #0
adds r9, r9, r4
str r9, [%[a], #24]
adc r5, r5, #0
# a[i+7] += m[7] * mu
ldr r7, [%[m], #28]
ldr r9, [%[a], #28]
umull r6, r7, r8, r7
adds r5, r5, r6
adcs r7, r7, %[ca]
mov %[ca], #0
adc %[ca], %[ca], %[ca]
adds r9, r9, r5
str r9, [%[a], #28]
ldr r9, [%[a], #32]
adcs r9, r9, r7
str r9, [%[a], #32]
adc %[ca], %[ca], #0
# i += 1
add %[a], %[a], #4
add r12, r12, #4
cmp r12, #32
blt 1b
str r10, [%[a], #0] # a[0] = r10
str r14, [%[a], #4] # a[1] = r14
str r10, [%[a], #0]
str r14, [%[a], #4]
: [ca] "+r" (ca), [a] "+r" (a)
: [m] "r" (m), [mp] "r" (mp)
: "memory", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r14", "r12"
: "memory", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r12", "r14"
);
memcpy(a, a + 8, 32);
if (ca)
a -= m;
}