[git commit] tls: P256: tweak arm assembly (currently disabled)
Denys Vlasenko
vda.linux at googlemail.com
Wed Oct 6 14:10:49 UTC 2021
commit: https://git.busybox.net/busybox/commit/?id=22fd8fd3f4c271d6037753165131c7c35a039762
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
networking/tls_sp_c32.c | 177 ++++++++++++++++++++++++------------------------
1 file changed, 89 insertions(+), 88 deletions(-)
diff --git a/networking/tls_sp_c32.c b/networking/tls_sp_c32.c
index 76f0770c2..532047739 100644
--- a/networking/tls_sp_c32.c
+++ b/networking/tls_sp_c32.c
@@ -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
-
- str r10, [%[a], #0] # a[0] = r10
- str r14, [%[a], #4] # a[1] = r14
+ # 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]
+ 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;
}
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