asm9_unix2_amd64.s

     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);
    15  TEXT	·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
    42  ok9:
    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
    48
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