asm9_unix2_amd64.s raw

   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