asm_linux_loong64.s

     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)
    12  TEXT ·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
    28  ok:
    29  	MOVV	R4, r1+32(FP)	// r1
    30  	MOVV	R0, err+40(FP)	// errno
    31  	RET
    32  
    33  TEXT ·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
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