root/src/pkg/crypto/sha1/sha1block_amd64.s

// 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 "../../../cmd/ld/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