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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// SHA1 block routine. See sha1block.go for Go equivalent.
//
// There are 80 rounds of 4 types:
// - rounds 0-15 are type 1 and load data (ROUND1 macro).
// - rounds 16-19 are type 1 and do not load data (ROUND1x macro).
// - rounds 20-39 are type 2 and do not load data (ROUND2 macro).
// - rounds 40-59 are type 3 and do not load data (ROUND3 macro).
// - rounds 60-79 are type 4 and do not load data (ROUND4 macro).
//
// Each round loads or shuffles the data, then computes a per-round
// function of b, c, d, and then mixes the result into and rotates the
// five registers a, b, c, d, e holding the intermediate results.
//
// The register rotation is implemented by rotating the arguments to
// the round macros instead of by explicit move instructions.
#define LOAD(index) \
MOVL (index*4)(SI), R10; \
BSWAPL R10; \
MOVL R10, (index*4)(SP)
#define SHUFFLE(index) \
MOVL (((index)&0xf)*4)(SP), R10; \
XORL (((index-3)&0xf)*4)(SP), R10; \
XORL (((index-8)&0xf)*4)(SP), R10; \
XORL (((index-14)&0xf)*4)(SP), R10; \
ROLL $1, R10; \
MOVL R10, (((index)&0xf)*4)(SP)
#define FUNC1(a, b, c, d, e) \
MOVL d, R9; \
XORL c, R9; \
ANDL b, R9; \
XORL d, R9
#define FUNC2(a, b, c, d, e) \
MOVL b, R9; \
XORL c, R9; \
XORL d, R9
#define FUNC3(a, b, c, d, e) \
MOVL b, R8; \
ORL c, R8; \
ANDL d, R8; \
MOVL b, R9; \
ANDL c, R9; \
ORL R8, R9
#define FUNC4 FUNC2
#define MIX(a, b, c, d, e, const) \
ROLL $30, b; \
ADDL R9, e; \
MOVL a, R8; \
ROLL $5, R8; \
LEAL const(e)(R10*1), e; \
ADDL R8, e
#define ROUND1(a, b, c, d, e, index) \
LOAD(index); \
FUNC1(a, b, c, d, e); \
MIX(a, b, c, d, e, 0x5A827999)
#define ROUND1x(a, b, c, d, e, index) \
SHUFFLE(index); \
FUNC1(a, b, c, d, e); \
MIX(a, b, c, d, e, 0x5A827999)
#define ROUND2(a, b, c, d, e, index) \
SHUFFLE(index); \
FUNC2(a, b, c, d, e); \
MIX(a, b, c, d, e, 0x6ED9EBA1)
#define ROUND3(a, b, c, d, e, index) \
SHUFFLE(index); \
FUNC3(a, b, c, d, e); \
MIX(a, b, c, d, e, 0x8F1BBCDC)
#define ROUND4(a, b, c, d, e, index) \
SHUFFLE(index); \
FUNC4(a, b, c, d, e); \
MIX(a, b, c, d, e, 0xCA62C1D6)
TEXT ·block(SB),NOSPLIT,$64-32
MOVQ dig+0(FP), BP
MOVQ p_base+8(FP), SI
MOVQ p_len+16(FP), DX
SHRQ $6, DX
SHLQ $6, DX
LEAQ (SI)(DX*1), DI
MOVL (0*4)(BP), AX
MOVL (1*4)(BP), BX
MOVL (2*4)(BP), CX
MOVL (3*4)(BP), DX
MOVL (4*4)(BP), BP
CMPQ SI, DI
JEQ end
loop:
MOVL AX, R11
MOVL BX, R12
MOVL CX, R13
MOVL DX, R14
MOVL BP, R15
ROUND1(AX, BX, CX, DX, BP, 0)
ROUND1(BP, AX, BX, CX, DX, 1)
ROUND1(DX, BP, AX, BX, CX, 2)
ROUND1(CX, DX, BP, AX, BX, 3)
ROUND1(BX, CX, DX, BP, AX, 4)
ROUND1(AX, BX, CX, DX, BP, 5)
ROUND1(BP, AX, BX, CX, DX, 6)
ROUND1(DX, BP, AX, BX, CX, 7)
ROUND1(CX, DX, BP, AX, BX, 8)
ROUND1(BX, CX, DX, BP, AX, 9)
ROUND1(AX, BX, CX, DX, BP, 10)
ROUND1(BP, AX, BX, CX, DX, 11)
ROUND1(DX, BP, AX, BX, CX, 12)
ROUND1(CX, DX, BP, AX, BX, 13)
ROUND1(BX, CX, DX, BP, AX, 14)
ROUND1(AX, BX, CX, DX, BP, 15)
ROUND1x(BP, AX, BX, CX, DX, 16)
ROUND1x(DX, BP, AX, BX, CX, 17)
ROUND1x(CX, DX, BP, AX, BX, 18)
ROUND1x(BX, CX, DX, BP, AX, 19)
ROUND2(AX, BX, CX, DX, BP, 20)
ROUND2(BP, AX, BX, CX, DX, 21)
ROUND2(DX, BP, AX, BX, CX, 22)
ROUND2(CX, DX, BP, AX, BX, 23)
ROUND2(BX, CX, DX, BP, AX, 24)
ROUND2(AX, BX, CX, DX, BP, 25)
ROUND2(BP, AX, BX, CX, DX, 26)
ROUND2(DX, BP, AX, BX, CX, 27)
ROUND2(CX, DX, BP, AX, BX, 28)
ROUND2(BX, CX, DX, BP, AX, 29)
ROUND2(AX, BX, CX, DX, BP, 30)
ROUND2(BP, AX, BX, CX, DX, 31)
ROUND2(DX, BP, AX, BX, CX, 32)
ROUND2(CX, DX, BP, AX, BX, 33)
ROUND2(BX, CX, DX, BP, AX, 34)
ROUND2(AX, BX, CX, DX, BP, 35)
ROUND2(BP, AX, BX, CX, DX, 36)
ROUND2(DX, BP, AX, BX, CX, 37)
ROUND2(CX, DX, BP, AX, BX, 38)
ROUND2(BX, CX, DX, BP, AX, 39)
ROUND3(AX, BX, CX, DX, BP, 40)
ROUND3(BP, AX, BX, CX, DX, 41)
ROUND3(DX, BP, AX, BX, CX, 42)
ROUND3(CX, DX, BP, AX, BX, 43)
ROUND3(BX, CX, DX, BP, AX, 44)
ROUND3(AX, BX, CX, DX, BP, 45)
ROUND3(BP, AX, BX, CX, DX, 46)
ROUND3(DX, BP, AX, BX, CX, 47)
ROUND3(CX, DX, BP, AX, BX, 48)
ROUND3(BX, CX, DX, BP, AX, 49)
ROUND3(AX, BX, CX, DX, BP, 50)
ROUND3(BP, AX, BX, CX, DX, 51)
ROUND3(DX, BP, AX, BX, CX, 52)
ROUND3(CX, DX, BP, AX, BX, 53)
ROUND3(BX, CX, DX, BP, AX, 54)
ROUND3(AX, BX, CX, DX, BP, 55)
ROUND3(BP, AX, BX, CX, DX, 56)
ROUND3(DX, BP, AX, BX, CX, 57)
ROUND3(CX, DX, BP, AX, BX, 58)
ROUND3(BX, CX, DX, BP, AX, 59)
ROUND4(AX, BX, CX, DX, BP, 60)
ROUND4(BP, AX, BX, CX, DX, 61)
ROUND4(DX, BP, AX, BX, CX, 62)
ROUND4(CX, DX, BP, AX, BX, 63)
ROUND4(BX, CX, DX, BP, AX, 64)
ROUND4(AX, BX, CX, DX, BP, 65)
ROUND4(BP, AX, BX, CX, DX, 66)
ROUND4(DX, BP, AX, BX, CX, 67)
ROUND4(CX, DX, BP, AX, BX, 68)
ROUND4(BX, CX, DX, BP, AX, 69)
ROUND4(AX, BX, CX, DX, BP, 70)
ROUND4(BP, AX, BX, CX, DX, 71)
ROUND4(DX, BP, AX, BX, CX, 72)
ROUND4(CX, DX, BP, AX, BX, 73)
ROUND4(BX, CX, DX, BP, AX, 74)
ROUND4(AX, BX, CX, DX, BP, 75)
ROUND4(BP, AX, BX, CX, DX, 76)
ROUND4(DX, BP, AX, BX, CX, 77)
ROUND4(CX, DX, BP, AX, BX, 78)
ROUND4(BX, CX, DX, BP, AX, 79)
ADDL R11, AX
ADDL R12, BX
ADDL R13, CX
ADDL R14, DX
ADDL R15, BP
ADDQ $64, SI
CMPQ SI, DI
JB loop
end:
MOVQ dig+0(FP), DI
MOVL AX, (0*4)(DI)
MOVL BX, (1*4)(DI)
MOVL CX, (2*4)(DI)
MOVL DX, (3*4)(DI)
MOVL BP, (4*4)(DI)
RET
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