asm_linux_loong64.s

Documentation: syscall

     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
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