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7df8d16475
Avoid excessive scheduling delays under a preemptible kernel by yielding the NEON after every block of input. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
167 lines
3.4 KiB
ArmAsm
167 lines
3.4 KiB
ArmAsm
/*
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* sha1-ce-core.S - SHA-1 secure hash using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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.arch armv8-a+crypto
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k0 .req v0
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k1 .req v1
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k2 .req v2
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k3 .req v3
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t0 .req v4
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t1 .req v5
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dga .req q6
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dgav .req v6
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dgb .req s7
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dgbv .req v7
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dg0q .req q12
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dg0s .req s12
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dg0v .req v12
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dg1s .req s13
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dg1v .req v13
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dg2s .req s14
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.macro add_only, op, ev, rc, s0, dg1
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.ifc \ev, ev
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add t1.4s, v\s0\().4s, \rc\().4s
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sha1h dg2s, dg0s
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.ifnb \dg1
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sha1\op dg0q, \dg1, t0.4s
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.else
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sha1\op dg0q, dg1s, t0.4s
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.endif
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.else
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.ifnb \s0
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add t0.4s, v\s0\().4s, \rc\().4s
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.endif
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sha1h dg1s, dg0s
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sha1\op dg0q, dg2s, t1.4s
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.endif
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.endm
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.macro add_update, op, ev, rc, s0, s1, s2, s3, dg1
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sha1su0 v\s0\().4s, v\s1\().4s, v\s2\().4s
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add_only \op, \ev, \rc, \s1, \dg1
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sha1su1 v\s0\().4s, v\s3\().4s
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.endm
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.macro loadrc, k, val, tmp
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movz \tmp, :abs_g0_nc:\val
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movk \tmp, :abs_g1:\val
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dup \k, \tmp
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.endm
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/*
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* void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
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* int blocks)
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*/
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ENTRY(sha1_ce_transform)
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frame_push 3
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mov x19, x0
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mov x20, x1
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mov x21, x2
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/* load round constants */
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0: loadrc k0.4s, 0x5a827999, w6
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loadrc k1.4s, 0x6ed9eba1, w6
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loadrc k2.4s, 0x8f1bbcdc, w6
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loadrc k3.4s, 0xca62c1d6, w6
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/* load state */
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ld1 {dgav.4s}, [x19]
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ldr dgb, [x19, #16]
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/* load sha1_ce_state::finalize */
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ldr_l w4, sha1_ce_offsetof_finalize, x4
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ldr w4, [x19, x4]
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/* load input */
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1: ld1 {v8.4s-v11.4s}, [x20], #64
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sub w21, w21, #1
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CPU_LE( rev32 v8.16b, v8.16b )
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CPU_LE( rev32 v9.16b, v9.16b )
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CPU_LE( rev32 v10.16b, v10.16b )
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CPU_LE( rev32 v11.16b, v11.16b )
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2: add t0.4s, v8.4s, k0.4s
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mov dg0v.16b, dgav.16b
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add_update c, ev, k0, 8, 9, 10, 11, dgb
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add_update c, od, k0, 9, 10, 11, 8
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add_update c, ev, k0, 10, 11, 8, 9
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add_update c, od, k0, 11, 8, 9, 10
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add_update c, ev, k1, 8, 9, 10, 11
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add_update p, od, k1, 9, 10, 11, 8
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add_update p, ev, k1, 10, 11, 8, 9
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add_update p, od, k1, 11, 8, 9, 10
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add_update p, ev, k1, 8, 9, 10, 11
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add_update p, od, k2, 9, 10, 11, 8
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add_update m, ev, k2, 10, 11, 8, 9
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add_update m, od, k2, 11, 8, 9, 10
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add_update m, ev, k2, 8, 9, 10, 11
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add_update m, od, k2, 9, 10, 11, 8
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add_update m, ev, k3, 10, 11, 8, 9
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add_update p, od, k3, 11, 8, 9, 10
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add_only p, ev, k3, 9
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add_only p, od, k3, 10
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add_only p, ev, k3, 11
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add_only p, od
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/* update state */
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add dgbv.2s, dgbv.2s, dg1v.2s
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add dgav.4s, dgav.4s, dg0v.4s
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cbz w21, 3f
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if_will_cond_yield_neon
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st1 {dgav.4s}, [x19]
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str dgb, [x19, #16]
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do_cond_yield_neon
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b 0b
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endif_yield_neon
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b 1b
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/*
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* Final block: add padding and total bit count.
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* Skip if the input size was not a round multiple of the block size,
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* the padding is handled by the C code in that case.
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*/
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3: cbz x4, 4f
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ldr_l w4, sha1_ce_offsetof_count, x4
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ldr x4, [x19, x4]
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movi v9.2d, #0
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mov x8, #0x80000000
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movi v10.2d, #0
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ror x7, x4, #29 // ror(lsl(x4, 3), 32)
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fmov d8, x8
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mov x4, #0
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mov v11.d[0], xzr
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mov v11.d[1], x7
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b 2b
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/* store new state */
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4: st1 {dgav.4s}, [x19]
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str dgb, [x19, #16]
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frame_pop
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ret
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ENDPROC(sha1_ce_transform)
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