github.com/MerlinKodo/gvisor@v0.0.0-20231110090155-957f62ecf90e/pkg/sentry/time/vdso_arm64.s (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include "textflag.h"
    16  
    17  #define SYS_clock_gettime       113
    18  
    19  TEXT ·vdsoClockGettime(SB), NOSPLIT, $0-24
    20  	MOVW clockid+0(FP), R0
    21  	MOVD ts+8(FP), R1
    22  	MOVD runtime·vdsoClockgettimeSym(SB), R2
    23  	CBZ R2, fallback
    24  	BL (R2)
    25  	MOVD R0, ret+16(FP)
    26  	RET
    27  fallback:
    28  	MOVD $SYS_clock_gettime, R8
    29  	SVC
    30  	MOVD R0, ret+16(FP)
    31  	RET