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C x86_64/poly1305-blocks.asm
ifelse(`
Copyright (C) 2022 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
')
.file "poly1305-blocks.asm"
define(`CTX', `%rdi') C First argument to all functions
define(`BLOCKS', `%rsi')
define(`MP_PARAM', `%rdx') C Moved to MP, to not collide with mul instruction.
define(`MP', `%r8') C May clobber, both with unix and windows conventions.
define(`T0', `%rbx')
define(`T1', `%rcx')
define(`H0', `%rbp')
define(`H1', `%r9')
define(`H2', `%r10')
define(`F0', `%r11')
define(`F1', `%r12')
C const uint8_t *
C _nettle_poly1305_blocks (struct poly1305_ctx *ctx, size_t blocks, const uint8_t *m)
PROLOGUE(_nettle_poly1305_blocks)
W64_ENTRY(3, 0)
mov MP_PARAM, MP
test BLOCKS, BLOCKS
jz .Lend
push %rbx
push %rbp
push %r12
mov P1305_H0 (CTX), H0
mov P1305_H1 (CTX), H1
mov P1305_H2 (CTX), H2
ALIGN(16)
.Loop:
mov (MP), T0
mov 8(MP), T1
add $16, MP
add H0, T0
adc H1, T1
adc $1, H2
mov P1305_R1 (CTX), %rax
mul T0 C R1*T0
mov %rax, F0
mov %rdx, F1
mov T0, %rax C Last use of T0 input
mov P1305_R0 (CTX), T0
mul T0 C R0*T0
mov %rax, H0
mov %rdx, H1
mov T1, %rax
mul T0 C R0*T1
add %rax, F0
adc %rdx, F1
mov P1305_S1 (CTX), T0
mov T1, %rax C Last use of T1 input
mul T0 C S1*T1
add %rax, H0
adc %rdx, H1
mov H2, %rax
mul T0 C S1*H2
add %rax, F0
adc %rdx, F1
mov H2, T0
and $3, H2
shr $2, T0
mov P1305_S0 (CTX), %rax
mul T0 C S0*(H2 >> 2)
add %rax, H0
adc %rdx, H1
imul P1305_R0 (CTX), H2 C R0*(H2 & 3)
add F0, H1
adc F1, H2
dec BLOCKS
jnz .Loop
mov H0, P1305_H0 (CTX)
mov H1, P1305_H1 (CTX)
mov H2, P1305_H2 (CTX)
pop %r12
pop %rbp
pop %rbx
.Lend:
mov MP, %rax
W64_EXIT(3, 0)
ret
EPILOGUE(_nettle_poly1305_blocks)
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