asm_linux_riscv64.s

Documentation: syscall

     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)
    12TEXT ·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
    26err:
    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
    33TEXT ·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
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