asm_linux_arm64.s

     1  // Copyright 2015 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  #include "textflag.h"
     6  
     7  // func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
     8  TEXT ·rawVforkSyscall(SB),NOSPLIT,$0-48
     9  	MOVD	a1+8(FP), R0
    10  	MOVD	a2+16(FP), R1
    11  	MOVD	a3+24(FP), R2
    12  	MOVD	$0, R3
    13  	MOVD	$0, R4
    14  	MOVD	$0, R5
    15  	MOVD	trap+0(FP), R8	// syscall entry
    16  	SVC
    17  	CMN	$4095, R0
    18  	BCC	ok
    19  	MOVD	$-1, R4
    20  	MOVD	R4, r1+32(FP)	// r1
    21  	NEG	R0, R0
    22  	MOVD	R0, err+40(FP)	// errno
    23  	RET
    24  ok:
    25  	MOVD	R0, r1+32(FP)	// r1
    26  	MOVD	ZR, err+40(FP)	// errno
    27  	RET
    28  
    29  // func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
    30  TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
    31  	MOVD	a1+8(FP), R0
    32  	MOVD	a2+16(FP), R1
    33  	MOVD	a3+24(FP), R2
    34  	MOVD	$0, R3
    35  	MOVD	$0, R4
    36  	MOVD	$0, R5
    37  	MOVD	trap+0(FP), R8	// syscall entry
    38  	SVC
    39  	MOVD	R0, r1+32(FP)
    40  	MOVD	R1, r2+40(FP)
    41  	RET
    42
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