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linux/arch/arm64/crypto/aes-modes.S
Mark Brown b8e505484e arm64: crypto: Modernize names for AES function macros 
Now that the rest of the code has been converted to the modern START/END
macros the AES_ENTRY() and AES_ENDPROC() macros look out of place and
like they need updating. Rename them to AES_FUNC_START() and AES_FUNC_END()
to line up with the modern style assembly macros.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2020-03-09 17:35:04 +00:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES
*
* Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
*/
/* included by aes-ce.S and aes-neon.S */
.text
.align 4
#ifndef MAX_STRIDE
#define MAX_STRIDE 4
#endif
#if MAX_STRIDE == 4
#define ST4(x...) x
#define ST5(x...)
#else
#define ST4(x...)
#define ST5(x...) x
#endif
SYM_FUNC_START_LOCAL(aes_encrypt_block4x)
encrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7
ret
SYM_FUNC_END(aes_encrypt_block4x)
SYM_FUNC_START_LOCAL(aes_decrypt_block4x)
decrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7
ret
SYM_FUNC_END(aes_decrypt_block4x)
#if MAX_STRIDE == 5
SYM_FUNC_START_LOCAL(aes_encrypt_block5x)
encrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7
ret
SYM_FUNC_END(aes_encrypt_block5x)
SYM_FUNC_START_LOCAL(aes_decrypt_block5x)
decrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7
ret
SYM_FUNC_END(aes_decrypt_block5x)
#endif
/*
* aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks)
* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks)
*/
AES_FUNC_START(aes_ecb_encrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
enc_prepare w3, x2, x5
.LecbencloopNx:
subs w4, w4, #MAX_STRIDE
bmi .Lecbenc1x
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
ST4( bl aes_encrypt_block4x )
ST5( ld1 {v4.16b}, [x1], #16 )
ST5( bl aes_encrypt_block5x )
st1 {v0.16b-v3.16b}, [x0], #64
ST5( st1 {v4.16b}, [x0], #16 )
b .LecbencloopNx
.Lecbenc1x:
adds w4, w4, #MAX_STRIDE
beq .Lecbencout
.Lecbencloop:
ld1 {v0.16b}, [x1], #16 /* get next pt block */
encrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lecbencloop
.Lecbencout:
ldp x29, x30, [sp], #16
ret
AES_FUNC_END(aes_ecb_encrypt)
AES_FUNC_START(aes_ecb_decrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
dec_prepare w3, x2, x5
.LecbdecloopNx:
subs w4, w4, #MAX_STRIDE
bmi .Lecbdec1x
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
ST4( bl aes_decrypt_block4x )
ST5( ld1 {v4.16b}, [x1], #16 )
ST5( bl aes_decrypt_block5x )
st1 {v0.16b-v3.16b}, [x0], #64
ST5( st1 {v4.16b}, [x0], #16 )
b .LecbdecloopNx
.Lecbdec1x:
adds w4, w4, #MAX_STRIDE
beq .Lecbdecout
.Lecbdecloop:
ld1 {v0.16b}, [x1], #16 /* get next ct block */
decrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lecbdecloop
.Lecbdecout:
ldp x29, x30, [sp], #16
ret
AES_FUNC_END(aes_ecb_decrypt)
/*
* aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
* aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[],
* int rounds, int blocks, u8 iv[],
* u32 const rk2[]);
* aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[],
* int rounds, int blocks, u8 iv[],
* u32 const rk2[]);
*/
AES_FUNC_START(aes_essiv_cbc_encrypt)
ld1 {v4.16b}, [x5] /* get iv */
mov w8, #14 /* AES-256: 14 rounds */
enc_prepare w8, x6, x7
encrypt_block v4, w8, x6, x7, w9
enc_switch_key w3, x2, x6
b .Lcbcencloop4x
AES_FUNC_START(aes_cbc_encrypt)
ld1 {v4.16b}, [x5] /* get iv */
enc_prepare w3, x2, x6
.Lcbcencloop4x:
subs w4, w4, #4
bmi .Lcbcenc1x
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
eor v0.16b, v0.16b, v4.16b /* ..and xor with iv */
encrypt_block v0, w3, x2, x6, w7
eor v1.16b, v1.16b, v0.16b
encrypt_block v1, w3, x2, x6, w7
eor v2.16b, v2.16b, v1.16b
encrypt_block v2, w3, x2, x6, w7
eor v3.16b, v3.16b, v2.16b
encrypt_block v3, w3, x2, x6, w7
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v3.16b
b .Lcbcencloop4x
.Lcbcenc1x:
adds w4, w4, #4
beq .Lcbcencout
.Lcbcencloop:
ld1 {v0.16b}, [x1], #16 /* get next pt block */
eor v4.16b, v4.16b, v0.16b /* ..and xor with iv */
encrypt_block v4, w3, x2, x6, w7
st1 {v4.16b}, [x0], #16
subs w4, w4, #1
bne .Lcbcencloop
.Lcbcencout:
st1 {v4.16b}, [x5] /* return iv */
ret
AES_FUNC_END(aes_cbc_encrypt)
AES_FUNC_END(aes_essiv_cbc_encrypt)
AES_FUNC_START(aes_essiv_cbc_decrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
ld1 {cbciv.16b}, [x5] /* get iv */
mov w8, #14 /* AES-256: 14 rounds */
enc_prepare w8, x6, x7
encrypt_block cbciv, w8, x6, x7, w9
b .Lessivcbcdecstart
AES_FUNC_START(aes_cbc_decrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
ld1 {cbciv.16b}, [x5] /* get iv */
.Lessivcbcdecstart:
dec_prepare w3, x2, x6
.LcbcdecloopNx:
subs w4, w4, #MAX_STRIDE
bmi .Lcbcdec1x
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
#if MAX_STRIDE == 5
ld1 {v4.16b}, [x1], #16 /* get 1 ct block */
mov v5.16b, v0.16b
mov v6.16b, v1.16b
mov v7.16b, v2.16b
bl aes_decrypt_block5x
sub x1, x1, #32
eor v0.16b, v0.16b, cbciv.16b
eor v1.16b, v1.16b, v5.16b
ld1 {v5.16b}, [x1], #16 /* reload 1 ct block */
ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */
eor v2.16b, v2.16b, v6.16b
eor v3.16b, v3.16b, v7.16b
eor v4.16b, v4.16b, v5.16b
#else
mov v4.16b, v0.16b
mov v5.16b, v1.16b
mov v6.16b, v2.16b
bl aes_decrypt_block4x
sub x1, x1, #16
eor v0.16b, v0.16b, cbciv.16b
eor v1.16b, v1.16b, v4.16b
ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */
eor v2.16b, v2.16b, v5.16b
eor v3.16b, v3.16b, v6.16b
#endif
st1 {v0.16b-v3.16b}, [x0], #64
ST5( st1 {v4.16b}, [x0], #16 )
b .LcbcdecloopNx
.Lcbcdec1x:
adds w4, w4, #MAX_STRIDE
beq .Lcbcdecout
.Lcbcdecloop:
ld1 {v1.16b}, [x1], #16 /* get next ct block */
mov v0.16b, v1.16b /* ...and copy to v0 */
decrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, cbciv.16b /* xor with iv => pt */
mov cbciv.16b, v1.16b /* ct is next iv */
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lcbcdecloop
.Lcbcdecout:
st1 {cbciv.16b}, [x5] /* return iv */
ldp x29, x30, [sp], #16
ret
AES_FUNC_END(aes_cbc_decrypt)
AES_FUNC_END(aes_essiv_cbc_decrypt)
/*
* aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[],
* int rounds, int bytes, u8 const iv[])
* aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[],
* int rounds, int bytes, u8 const iv[])
*/
AES_FUNC_START(aes_cbc_cts_encrypt)
adr_l x8, .Lcts_permute_table
sub x4, x4, #16
add x9, x8, #32
add x8, x8, x4
sub x9, x9, x4
ld1 {v3.16b}, [x8]
ld1 {v4.16b}, [x9]
ld1 {v0.16b}, [x1], x4 /* overlapping loads */
ld1 {v1.16b}, [x1]
ld1 {v5.16b}, [x5] /* get iv */
enc_prepare w3, x2, x6
eor v0.16b, v0.16b, v5.16b /* xor with iv */
tbl v1.16b, {v1.16b}, v4.16b
encrypt_block v0, w3, x2, x6, w7
eor v1.16b, v1.16b, v0.16b
tbl v0.16b, {v0.16b}, v3.16b
encrypt_block v1, w3, x2, x6, w7
add x4, x0, x4
st1 {v0.16b}, [x4] /* overlapping stores */
st1 {v1.16b}, [x0]
ret
AES_FUNC_END(aes_cbc_cts_encrypt)
AES_FUNC_START(aes_cbc_cts_decrypt)
adr_l x8, .Lcts_permute_table
sub x4, x4, #16
add x9, x8, #32
add x8, x8, x4
sub x9, x9, x4
ld1 {v3.16b}, [x8]
ld1 {v4.16b}, [x9]
ld1 {v0.16b}, [x1], x4 /* overlapping loads */
ld1 {v1.16b}, [x1]
ld1 {v5.16b}, [x5] /* get iv */
dec_prepare w3, x2, x6
decrypt_block v0, w3, x2, x6, w7
tbl v2.16b, {v0.16b}, v3.16b
eor v2.16b, v2.16b, v1.16b
tbx v0.16b, {v1.16b}, v4.16b
decrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, v5.16b /* xor with iv */
add x4, x0, x4
st1 {v2.16b}, [x4] /* overlapping stores */
st1 {v0.16b}, [x0]
ret
AES_FUNC_END(aes_cbc_cts_decrypt)
.section ".rodata", "a"
.align 6
.Lcts_permute_table:
.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
.byte 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7
.byte 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf
.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
.previous
/*
* aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 ctr[])
*/
AES_FUNC_START(aes_ctr_encrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
enc_prepare w3, x2, x6
ld1 {vctr.16b}, [x5]
umov x6, vctr.d[1] /* keep swabbed ctr in reg */
rev x6, x6
cmn w6, w4 /* 32 bit overflow? */
bcs .Lctrloop
.LctrloopNx:
subs w4, w4, #MAX_STRIDE
bmi .Lctr1x
add w7, w6, #1
mov v0.16b, vctr.16b
add w8, w6, #2
mov v1.16b, vctr.16b
add w9, w6, #3
mov v2.16b, vctr.16b
add w9, w6, #3
rev w7, w7
mov v3.16b, vctr.16b
rev w8, w8
ST5( mov v4.16b, vctr.16b )
mov v1.s[3], w7
rev w9, w9
ST5( add w10, w6, #4 )
mov v2.s[3], w8
ST5( rev w10, w10 )
mov v3.s[3], w9
ST5( mov v4.s[3], w10 )
ld1 {v5.16b-v7.16b}, [x1], #48 /* get 3 input blocks */
ST4( bl aes_encrypt_block4x )
ST5( bl aes_encrypt_block5x )
eor v0.16b, v5.16b, v0.16b
ST4( ld1 {v5.16b}, [x1], #16 )
eor v1.16b, v6.16b, v1.16b
ST5( ld1 {v5.16b-v6.16b}, [x1], #32 )
eor v2.16b, v7.16b, v2.16b
eor v3.16b, v5.16b, v3.16b
ST5( eor v4.16b, v6.16b, v4.16b )
st1 {v0.16b-v3.16b}, [x0], #64
ST5( st1 {v4.16b}, [x0], #16 )
add x6, x6, #MAX_STRIDE
rev x7, x6
ins vctr.d[1], x7
cbz w4, .Lctrout
b .LctrloopNx
.Lctr1x:
adds w4, w4, #MAX_STRIDE
beq .Lctrout
.Lctrloop:
mov v0.16b, vctr.16b
encrypt_block v0, w3, x2, x8, w7
adds x6, x6, #1 /* increment BE ctr */
rev x7, x6
ins vctr.d[1], x7
bcs .Lctrcarry /* overflow? */
.Lctrcarrydone:
subs w4, w4, #1
bmi .Lctrtailblock /* blocks <0 means tail block */
ld1 {v3.16b}, [x1], #16
eor v3.16b, v0.16b, v3.16b
st1 {v3.16b}, [x0], #16
bne .Lctrloop
.Lctrout:
st1 {vctr.16b}, [x5] /* return next CTR value */
ldp x29, x30, [sp], #16
ret
.Lctrtailblock:
st1 {v0.16b}, [x0]
b .Lctrout
.Lctrcarry:
umov x7, vctr.d[0] /* load upper word of ctr */
rev x7, x7 /* ... to handle the carry */
add x7, x7, #1
rev x7, x7
ins vctr.d[0], x7
b .Lctrcarrydone
AES_FUNC_END(aes_ctr_encrypt)
/*
* aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int bytes, u8 const rk2[], u8 iv[], int first)
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int bytes, u8 const rk2[], u8 iv[], int first)
*/
.macro next_tweak, out, in, tmp
sshr \tmp\().2d, \in\().2d, #63
and \tmp\().16b, \tmp\().16b, xtsmask.16b
add \out\().2d, \in\().2d, \in\().2d
ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
eor \out\().16b, \out\().16b, \tmp\().16b
.endm
.macro xts_load_mask, tmp
movi xtsmask.2s, #0x1
movi \tmp\().2s, #0x87
uzp1 xtsmask.4s, xtsmask.4s, \tmp\().4s
.endm
AES_FUNC_START(aes_xts_encrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
ld1 {v4.16b}, [x6]
xts_load_mask v8
cbz w7, .Lxtsencnotfirst
enc_prepare w3, x5, x8
xts_cts_skip_tw w7, .LxtsencNx
encrypt_block v4, w3, x5, x8, w7 /* first tweak */
enc_switch_key w3, x2, x8
b .LxtsencNx
.Lxtsencnotfirst:
enc_prepare w3, x2, x8
.LxtsencloopNx:
next_tweak v4, v4, v8
.LxtsencNx:
subs w4, w4, #64
bmi .Lxtsenc1x
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
next_tweak v5, v4, v8
eor v0.16b, v0.16b, v4.16b
next_tweak v6, v5, v8
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
next_tweak v7, v6, v8
eor v3.16b, v3.16b, v7.16b
bl aes_encrypt_block4x
eor v3.16b, v3.16b, v7.16b
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v7.16b
cbz w4, .Lxtsencret
xts_reload_mask v8
b .LxtsencloopNx
.Lxtsenc1x:
adds w4, w4, #64
beq .Lxtsencout
subs w4, w4, #16
bmi .LxtsencctsNx
.Lxtsencloop:
ld1 {v0.16b}, [x1], #16
.Lxtsencctsout:
eor v0.16b, v0.16b, v4.16b
encrypt_block v0, w3, x2, x8, w7
eor v0.16b, v0.16b, v4.16b
cbz w4, .Lxtsencout
subs w4, w4, #16
next_tweak v4, v4, v8
bmi .Lxtsenccts
st1 {v0.16b}, [x0], #16
b .Lxtsencloop
.Lxtsencout:
st1 {v0.16b}, [x0]
.Lxtsencret:
st1 {v4.16b}, [x6]
ldp x29, x30, [sp], #16
ret
.LxtsencctsNx:
mov v0.16b, v3.16b
sub x0, x0, #16
.Lxtsenccts:
adr_l x8, .Lcts_permute_table
add x1, x1, w4, sxtw /* rewind input pointer */
add w4, w4, #16 /* # bytes in final block */
add x9, x8, #32
add x8, x8, x4
sub x9, x9, x4
add x4, x0, x4 /* output address of final block */
ld1 {v1.16b}, [x1] /* load final block */
ld1 {v2.16b}, [x8]
ld1 {v3.16b}, [x9]
tbl v2.16b, {v0.16b}, v2.16b
tbx v0.16b, {v1.16b}, v3.16b
st1 {v2.16b}, [x4] /* overlapping stores */
mov w4, wzr
b .Lxtsencctsout
AES_FUNC_END(aes_xts_encrypt)
AES_FUNC_START(aes_xts_decrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
/* subtract 16 bytes if we are doing CTS */
sub w8, w4, #0x10
tst w4, #0xf
csel w4, w4, w8, eq
ld1 {v4.16b}, [x6]
xts_load_mask v8
xts_cts_skip_tw w7, .Lxtsdecskiptw
cbz w7, .Lxtsdecnotfirst
enc_prepare w3, x5, x8
encrypt_block v4, w3, x5, x8, w7 /* first tweak */
.Lxtsdecskiptw:
dec_prepare w3, x2, x8
b .LxtsdecNx
.Lxtsdecnotfirst:
dec_prepare w3, x2, x8
.LxtsdecloopNx:
next_tweak v4, v4, v8
.LxtsdecNx:
subs w4, w4, #64
bmi .Lxtsdec1x
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
next_tweak v5, v4, v8
eor v0.16b, v0.16b, v4.16b
next_tweak v6, v5, v8
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
next_tweak v7, v6, v8
eor v3.16b, v3.16b, v7.16b
bl aes_decrypt_block4x
eor v3.16b, v3.16b, v7.16b
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v7.16b
cbz w4, .Lxtsdecout
xts_reload_mask v8
b .LxtsdecloopNx
.Lxtsdec1x:
adds w4, w4, #64
beq .Lxtsdecout
subs w4, w4, #16
.Lxtsdecloop:
ld1 {v0.16b}, [x1], #16
bmi .Lxtsdeccts
.Lxtsdecctsout:
eor v0.16b, v0.16b, v4.16b
decrypt_block v0, w3, x2, x8, w7
eor v0.16b, v0.16b, v4.16b
st1 {v0.16b}, [x0], #16
cbz w4, .Lxtsdecout
subs w4, w4, #16
next_tweak v4, v4, v8
b .Lxtsdecloop
.Lxtsdecout:
st1 {v4.16b}, [x6]
ldp x29, x30, [sp], #16
ret
.Lxtsdeccts:
adr_l x8, .Lcts_permute_table
add x1, x1, w4, sxtw /* rewind input pointer */
add w4, w4, #16 /* # bytes in final block */
add x9, x8, #32
add x8, x8, x4
sub x9, x9, x4
add x4, x0, x4 /* output address of final block */
next_tweak v5, v4, v8
ld1 {v1.16b}, [x1] /* load final block */
ld1 {v2.16b}, [x8]
ld1 {v3.16b}, [x9]
eor v0.16b, v0.16b, v5.16b
decrypt_block v0, w3, x2, x8, w7
eor v0.16b, v0.16b, v5.16b
tbl v2.16b, {v0.16b}, v2.16b
tbx v0.16b, {v1.16b}, v3.16b
st1 {v2.16b}, [x4] /* overlapping stores */
mov w4, wzr
b .Lxtsdecctsout
AES_FUNC_END(aes_xts_decrypt)
/*
* aes_mac_update(u8 const in[], u32 const rk[], int rounds,
* int blocks, u8 dg[], int enc_before, int enc_after)
*/
AES_FUNC_START(aes_mac_update)
frame_push 6
mov x19, x0
mov x20, x1
mov x21, x2
mov x22, x3
mov x23, x4
mov x24, x6
ld1 {v0.16b}, [x23] /* get dg */
enc_prepare w2, x1, x7
cbz w5, .Lmacloop4x
encrypt_block v0, w2, x1, x7, w8
.Lmacloop4x:
subs w22, w22, #4
bmi .Lmac1x
ld1 {v1.16b-v4.16b}, [x19], #64 /* get next pt block */
eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
encrypt_block v0, w21, x20, x7, w8
eor v0.16b, v0.16b, v2.16b
encrypt_block v0, w21, x20, x7, w8
eor v0.16b, v0.16b, v3.16b
encrypt_block v0, w21, x20, x7, w8
eor v0.16b, v0.16b, v4.16b
cmp w22, wzr
csinv x5, x24, xzr, eq
cbz w5, .Lmacout
encrypt_block v0, w21, x20, x7, w8
st1 {v0.16b}, [x23] /* return dg */
cond_yield_neon .Lmacrestart
b .Lmacloop4x
.Lmac1x:
add w22, w22, #4
.Lmacloop:
cbz w22, .Lmacout
ld1 {v1.16b}, [x19], #16 /* get next pt block */
eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
subs w22, w22, #1
csinv x5, x24, xzr, eq
cbz w5, .Lmacout
.Lmacenc:
encrypt_block v0, w21, x20, x7, w8
b .Lmacloop
.Lmacout:
st1 {v0.16b}, [x23] /* return dg */
frame_pop
ret
.Lmacrestart:
ld1 {v0.16b}, [x23] /* get dg */
enc_prepare w21, x20, x0
b .Lmacloop4x
AES_FUNC_END(aes_mac_update)
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