asm9_unix2_amd64.s

Documentation: syscall

     1// Copyright 2016 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//go:build dragonfly || freebsd || netbsd
     6
     7#include "textflag.h"
     8#include "funcdata.h"
     9
    10//
    11// Syscall9 support for AMD64, DragonFly, FreeBSD and NetBSD
    12//
    13
    14// func Syscall9(trap int64, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int64);
    15TEXT	·Syscall9(SB),NOSPLIT,$32-104
    16	NO_LOCAL_POINTERS
    17	CALL	runtime·entersyscall<ABIInternal>(SB)
    18	MOVQ	num+0(FP), AX	// syscall entry
    19	MOVQ	a1+8(FP), DI
    20	MOVQ	a2+16(FP), SI
    21	MOVQ	a3+24(FP), DX
    22	MOVQ	a4+32(FP), R10
    23	MOVQ	a5+40(FP), R8
    24	MOVQ	a6+48(FP), R9
    25	MOVQ	a7+56(FP), R11
    26	MOVQ	a8+64(FP), R12
    27	MOVQ	a9+72(FP), R13
    28
    29	// only the first 6 arguments can be passed in registers,
    30	// the last three should be placed at the top of the stack.
    31	MOVQ	R11, 8(SP)	// arg 7
    32	MOVQ	R12, 16(SP)	// arg 8
    33	MOVQ	R13, 24(SP)	// arg 9
    34
    35	SYSCALL
    36	JCC	ok9
    37	MOVQ	$-1, r1+80(FP)	// r1
    38	MOVQ	$0, r2+88(FP)	// r2
    39	MOVQ	AX, err+96(FP)	// errno
    40	CALL	runtime·exitsyscall<ABIInternal>(SB)
    41	RET
    42ok9:
    43	MOVQ	AX, r1+80(FP)	// r1
    44	MOVQ	DX, r2+88(FP)	// r2
    45	MOVQ	$0, err+96(FP)	// errno
    46	CALL	runtime·exitsyscall<ABIInternal>(SB)
    47	RET
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