1// Copyright 2022 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 loong64, Linux
9//
10
11// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
12TEXT ·rawVforkSyscall(SB),NOSPLIT,$0-48
13	MOVV	a1+8(FP), R4
14	MOVV	a2+16(FP), R5
15	MOVV	a3+24(FP), R6
16	MOVV	$0, R7
17	MOVV	$0, R8
18	MOVV	$0, R9
19	MOVV	trap+0(FP), R11	// syscall entry
20	SYSCALL
21	MOVW	$-4096, R12
22	BGEU	R12, R4, ok
23	MOVV	$-1, R12
24	MOVV	R12, r1+32(FP)	// r1
25	SUBVU	R4, R0, R4
26	MOVV	R4, err+40(FP)	// errno
27	RET
28ok:
29	MOVV	R4, r1+32(FP)	// r1
30	MOVV	R0, err+40(FP)	// errno
31	RET
32
33TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
34	MOVV	a1+8(FP), R4
35	MOVV	a2+16(FP), R5
36	MOVV	a3+24(FP), R6
37	MOVV	R0, R7
38	MOVV	R0, R8
39	MOVV	R0, R9
40	MOVV	trap+0(FP), R11	// syscall entry
41	SYSCALL
42	MOVV	R4, r1+32(FP)
43	MOVV	R0, r2+40(FP)	// r2 is not used. Always set to 0.
44	RET
45