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35 lines
917 B
ArmAsm
35 lines
917 B
ArmAsm
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// func featureCheck() bool
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TEXT ·featureCheck(SB),NOSPLIT,$16-1
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LA tmp-16(SP), R1
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XOR R0, R0 // query function code is 0
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WORD $0xB93E0006 // KIMD (R6 is ignored)
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MOVBZ tmp-16(SP), R4 // get the first byte
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AND $0x20, R4 // bit 2 (big endian) for SHA256
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CMPBEQ R4, $0, nosha256
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MOVB $1, ret+0(FP)
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RET
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nosha256:
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MOVB $0, ret+0(FP)
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RET
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// func block(dig *digest, p []byte)
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TEXT ·block(SB),NOSPLIT,$0-32
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MOVBZ ·useAsm(SB), R4
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LMG dig+0(FP), R1, R3 // R2 = &p[0], R3 = len(p)
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CMPBNE R4, $1, generic
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MOVBZ $2, R0 // SHA256 function code
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loop:
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WORD $0xB93E0002 // KIMD R2
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BVS loop // continue if interrupted
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done:
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XOR R0, R0 // restore R0
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RET
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generic:
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BR ·blockGeneric(SB)
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