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// 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
#ifdef GOEXPERIMENT_regabiargs
MOVV R4, R11 // syscall entry
MOVV R5, R4
MOVV R6, R5
MOVV R7, R6
MOVV R8, R7
MOVV R9, R8
MOVV R10, R9
#else
MOVV num+0(FP), R11 // syscall entry
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV a4+32(FP), R7
MOVV a5+40(FP), R8
MOVV a6+48(FP), R9
#endif
SYSCALL
#ifdef GOEXPERIMENT_regabiargs
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
#else
MOVW $-4096, R12
BGEU R12, R4, ok
MOVV $-1, R12
MOVV R12, r1+56(FP)
MOVV R0, r2+64(FP)
SUBVU R4, R0, R4
MOVV R4, errno+72(FP)
#endif
RET
ok:
#ifdef GOEXPERIMENT_regabiargs
// r1 already in R4
MOVV R0, R6 // errno
#else
MOVV R4, r1+56(FP)
MOVV R0, r2+64(FP) // r2 is not used. Always set to 0.
MOVV R0, errno+72(FP)
#endif
RET
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