asm_linux_riscv64.s

     1  // Copyright 2019 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  //
     8  // System calls for riscv64, Linux
     9  //
    10  
    11  // func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
    12  TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
    13  	MOV	a1+8(FP), A0
    14  	MOV	a2+16(FP), A1
    15  	MOV	a3+24(FP), A2
    16  	MOV	ZERO, A3
    17  	MOV	ZERO, A4
    18  	MOV	ZERO, A5
    19  	MOV	trap+0(FP), A7	// syscall entry
    20  	ECALL
    21  	MOV	$-4096, T0
    22  	BLTU	T0, A0, err
    23  	MOV	A0, r1+32(FP)	// r1
    24  	MOV	ZERO, err+40(FP)	// errno
    25  	RET
    26  err:
    27  	MOV	$-1, T0
    28  	MOV	T0, r1+32(FP)	// r1
    29  	SUB	A0, ZERO, A0
    30  	MOV	A0, err+40(FP)	// errno
    31  	RET
    32  
    33  TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
    34  	MOV	a1+8(FP), A0
    35  	MOV	a2+16(FP), A1
    36  	MOV	a3+24(FP), A2
    37  	MOV	trap+0(FP), A7	// syscall entry
    38  	ECALL
    39  	MOV	A0, r1+32(FP)
    40  	MOV	A1, r2+40(FP)
    41  	RET
    42
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