github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/crypto/ecdsa/ecdsa_s390x.s (about)

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build !purego
     6  
     7  #include "textflag.h"
     8  
     9  // func kdsa(fc uint64, params *[4096]byte) (errn uint64)
    10  TEXT ·kdsa(SB), NOSPLIT|NOFRAME, $0-24
    11  	MOVD fc+0(FP), R0     // function code
    12  	MOVD params+8(FP), R1 // address parameter block
    13  
    14  loop:
    15  	KDSA R0, R4      // compute digital signature authentication
    16  	BVS  loop        // branch back if interrupted
    17  	BGT  retry       // signing unsuccessful, but retry with new CSPRN
    18  	BLT  error       // condition code of 1 indicates a failure
    19  
    20  success:
    21  	MOVD $0, errn+16(FP) // return 0 - sign/verify was successful
    22  	RET
    23  
    24  error:
    25  	MOVD $1, errn+16(FP) // return 1 - sign/verify failed
    26  	RET
    27  
    28  retry:
    29  	MOVD $2, errn+16(FP) // return 2 - sign/verify was unsuccessful -- if sign, retry with new RN
    30  	RET