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Text file src/syscall/asm9_unix2_amd64.s

Documentation: syscall

     1// +build dragonfly freebsd
     2
     3// Copyright 2016 The Go Authors. All rights reserved.
     4// Use of this source code is governed by a BSD-style
     5// license that can be found in the LICENSE file.
     6
     7#include "textflag.h"
     8#include "funcdata.h"
     9
    10//
    11// Syscall9 support for AMD64, DragonFly and FreeBSD
    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,$0-104
    16	CALL	runtime·entersyscall(SB)
    17	MOVQ	num+0(FP), AX	// syscall entry
    18	MOVQ	a1+8(FP), DI
    19	MOVQ	a2+16(FP), SI
    20	MOVQ	a3+24(FP), DX
    21	MOVQ	a4+32(FP), R10
    22	MOVQ	a5+40(FP), R8
    23	MOVQ	a6+48(FP), R9
    24
    25	// shift around the last three arguments so they're at the
    26	// top of the stack when the syscall is called.
    27	MOVQ	a7+56(FP), R11 // arg 7
    28	MOVQ	R11, 8(SP)
    29	MOVQ	a8+64(FP), R11 // arg 8
    30	MOVQ	R11, 16(SP)
    31	MOVQ	a9+72(FP), R11 // arg 9
    32	MOVQ	R11, 24(SP)
    33
    34	SYSCALL
    35	JCC	ok9
    36	MOVQ	$-1, r1+80(FP)	// r1
    37	MOVQ	$0, r2+88(FP)	// r2
    38	MOVQ	AX, err+96(FP)	// errno
    39	CALL	runtime·exitsyscall(SB)
    40	RET
    41ok9:
    42	MOVQ	AX, r1+80(FP)	// r1
    43	MOVQ	DX, r2+88(FP)	// r2
    44	MOVQ	$0, err+96(FP)	// errno
    45	CALL	runtime·exitsyscall(SB)
    46	RET

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