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sha3: use x/sys/cpu for s390x feature detection

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Use the recently added CPU feature detection API rather than custom
assembly.

While we are here also make vet happy by renaming params in the asm
file to chain to match the go function declaration.

Change-Id: Ide0171793c9fa5ef6671b394e97a27f2c6e44a9f
Reviewed-on: https://go-review.googlesource.com/c/164381
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Michael Munday
2019-02-28 16:14:30 +00:00
parent 31a3858548
commit e37aea1ec3
2 changed files with 12 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sha3/sha3_s390x.go
+8 -13
View File
@@ -12,6 +12,8 @@ package sha3
import (
"hash"
"golang.org/x/sys/cpu"
)
// codes represent 7-bit KIMD/KLMD function codes as defined in
@@ -29,13 +31,6 @@ const (
nopad = 0x100
)
// hasMSA6 reports whether the machine supports the SHA-3 and SHAKE function
// codes, as defined in message-security-assist extension 6.
func hasMSA6() bool
// hasAsm caches the result of hasMSA6 (which might be expensive to call).
var hasAsm = hasMSA6()
// kimd is a wrapper for the 'compute intermediate message digest' instruction.
// src must be a multiple of the rate for the given function code.
//go:noescape
@@ -237,7 +232,7 @@ func (s *asmState) Clone() ShakeHash {
// new224Asm returns an assembly implementation of SHA3-224 if available,
// otherwise it returns nil.
func new224Asm() hash.Hash {
if hasAsm {
if cpu.S390X.HasSHA3 {
return newAsmState(sha3_224)
}
return nil
@@ -246,7 +241,7 @@ func new224Asm() hash.Hash {
// new256Asm returns an assembly implementation of SHA3-256 if available,
// otherwise it returns nil.
func new256Asm() hash.Hash {
if hasAsm {
if cpu.S390X.HasSHA3 {
return newAsmState(sha3_256)
}
return nil
@@ -255,7 +250,7 @@ func new256Asm() hash.Hash {
// new384Asm returns an assembly implementation of SHA3-384 if available,
// otherwise it returns nil.
func new384Asm() hash.Hash {
if hasAsm {
if cpu.S390X.HasSHA3 {
return newAsmState(sha3_384)
}
return nil
@@ -264,7 +259,7 @@ func new384Asm() hash.Hash {
// new512Asm returns an assembly implementation of SHA3-512 if available,
// otherwise it returns nil.
func new512Asm() hash.Hash {
if hasAsm {
if cpu.S390X.HasSHA3 {
return newAsmState(sha3_512)
}
return nil
@@ -273,7 +268,7 @@ func new512Asm() hash.Hash {
// newShake128Asm returns an assembly implementation of SHAKE-128 if available,
// otherwise it returns nil.
func newShake128Asm() ShakeHash {
if hasAsm {
if cpu.S390X.HasSHA3 {
return newAsmState(shake_128)
}
return nil
@@ -282,7 +277,7 @@ func newShake128Asm() ShakeHash {
// newShake256Asm returns an assembly implementation of SHAKE-256 if available,
// otherwise it returns nil.
func newShake256Asm() ShakeHash {
if hasAsm {
if cpu.S390X.HasSHA3 {
return newAsmState(shake_256)
}
return nil
sha3/sha3_s390x.s
+4 -20
View File
@@ -6,26 +6,10 @@
#include "textflag.h"
TEXT ·hasMSA6(SB), NOSPLIT, $16-1
MOVD $0, R0 // KIMD-Query function code
MOVD $tmp-16(SP), R1 // parameter block
XC $16, (R1), (R1) // clear the parameter block
WORD $0xB93E0002 // KIMD --, --
WORD $0x91FC1004 // TM 4(R1), 0xFC (test bits [32-37])
BVS yes
no:
MOVB $0, ret+0(FP)
RET
yes:
MOVB $1, ret+0(FP)
RET
// func kimd(function code, params *[200]byte, src []byte)
// func kimd(function code, chain *[200]byte, src []byte)
TEXT ·kimd(SB), NOFRAME|NOSPLIT, $0-40
MOVD function+0(FP), R0
MOVD params+8(FP), R1
MOVD chain+8(FP), R1
LMG src+16(FP), R2, R3 // R2=base, R3=len
continue:
@@ -34,11 +18,11 @@ continue:
MOVD $0, R0 // reset R0 for pre-go1.8 compilers
RET
// func klmd(function code, params *[200]byte, dst, src []byte)
// func klmd(function code, chain *[200]byte, dst, src []byte)
TEXT ·klmd(SB), NOFRAME|NOSPLIT, $0-64
// TODO: SHAKE support
MOVD function+0(FP), R0
MOVD params+8(FP), R1
MOVD chain+8(FP), R1
LMG dst+16(FP), R2, R3 // R2=base, R3=len
LMG src+40(FP), R4, R5 // R4=base, R5=len