Text file
src/syscall/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
6 // +build dragonfly freebsd
7
8 #include "textflag.h"
9 #include "funcdata.h"
10
11 //
12 // Syscall9 support for AMD64, DragonFly and FreeBSD
13 //
14
15 // func Syscall9(trap int64, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int64);
16 TEXT ·Syscall9(SB),NOSPLIT,$0-104
17 CALL runtime·entersyscall(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
26 // shift around the last three arguments so they're at the
27 // top of the stack when the syscall is called.
28 // note that we are scribbling over the Go arguments now.
29 MOVQ SP, CX // hide (SP) writes from vet
30 MOVQ a7+56(FP), R11 // arg 7
31 MOVQ R11, 8(CX)
32 MOVQ a8+64(FP), R11 // arg 8
33 MOVQ R11, 16(CX)
34 MOVQ a9+72(FP), R11 // arg 9
35 MOVQ R11, 24(CX)
36
37 SYSCALL
38 JCC ok9
39 MOVQ $-1, r1+80(FP) // r1
40 MOVQ $0, r2+88(FP) // r2
41 MOVQ AX, err+96(FP) // errno
42 CALL runtime·exitsyscall(SB)
43 RET
44 ok9:
45 MOVQ AX, r1+80(FP) // r1
46 MOVQ DX, r2+88(FP) // r2
47 MOVQ $0, err+96(FP) // errno
48 CALL runtime·exitsyscall(SB)
49 RET
50
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