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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 | AX | AX // a1 | BX | DI // a2 | CX | SI // a3 | DI | DX // a4 | SI | R10 // a5 | R8 | R8 // a6 | R9 | R9 // // r1 | AX | AX // r2 | BX | DX // err | CX | part of AX // // Note that this differs from "standard" ABI convention, which would pass 4th // arg in CX, not R10. TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0 // a6 already in R9. // a5 already in R8. MOVQ SI, R10 // a4 MOVQ DI, DX // a3 MOVQ CX, SI // a2 MOVQ BX, DI // a1 // num already in AX. SYSCALL CMPQ AX, $0xfffffffffffff001 JLS ok NEGQ AX MOVQ AX, CX // errno MOVQ $-1, AX // r1 MOVQ $0, BX // r2 RET ok: // r1 already in AX. MOVQ DX, BX // r2 MOVQ $0, CX // errno RET