// Copyright 2022 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

#include "textflag.h"

// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)

//

// We need to convert to the syscall ABI.

//

// arg | ABIInternal | Syscall

// ---------------------------

// num | R4 | R11

// a1 | R5 | R4

// a2 | R6 | R5

// a3 | R7 | R6

// a4 | R8 | R7

// a5 | R9 | R8

// a6 | R10 | R9

//

// r1 | R4 | R4

// r2 | R5 | R5

// err | R6 | part of R4

TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0-80

MOVV R4, R11 // syscall entry

MOVV R5, R4

MOVV R6, R5

MOVV R7, R6

MOVV R8, R7

MOVV R9, R8

MOVV R10, R9

SYSCALL

MOVV R0, R5 // r2 is not used. Always set to 0.

MOVW $-4096, R12

BGEU R12, R4, ok

SUBVU R4, R0, R6 // errno

MOVV $-1, R4 // r1

RET

ok:

// r1 already in R4

MOVV R0, R6 // errno

RET