github.com/mtsmfm/go/src@v0.0.0-20221020090648-44bdcb9f8fde/syscall/asm9_unix2_amd64.s (about)

     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
     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);
    15  TEXT	·Syscall9(SB),NOSPLIT,$0-104
    16  	CALL	runtime·entersyscall<ABIInternal>(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  	// note that we are scribbling over the Go arguments now.
    28  	MOVQ	SP, CX	// hide (SP) writes from vet
    29  	MOVQ	a7+56(FP), R11 // arg 7
    30  	MOVQ	R11, 8(CX)
    31  	MOVQ	a8+64(FP), R11 // arg 8
    32  	MOVQ	R11, 16(CX)
    33  	MOVQ	a9+72(FP), R11 // arg 9
    34  	MOVQ	R11, 24(CX)
    35  
    36  	SYSCALL
    37  	JCC	ok9
    38  	MOVQ	$-1, r1+80(FP)	// r1
    39  	MOVQ	$0, r2+88(FP)	// r2
    40  	MOVQ	AX, err+96(FP)	// errno
    41  	CALL	runtime·exitsyscall<ABIInternal>(SB)
    42  	RET
    43  ok9:
    44  	MOVQ	AX, r1+80(FP)	// r1
    45  	MOVQ	DX, r2+88(FP)	// r2
    46  	MOVQ	$0, err+96(FP)	// errno
    47  	CALL	runtime·exitsyscall<ABIInternal>(SB)
    48  	RET