1// Copyright 2009 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#include "textflag.h"
6#include "abi_amd64.h"
7
8// Called by C code generated by cmd/cgo.
9// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
10// Saves C callee-saved registers and calls cgocallback with three arguments.
11// fn is the PC of a func(a unsafe.Pointer) function.
12// This signature is known to SWIG, so we can't change it.
13TEXT crosscall2(SB),NOSPLIT,$0-0
14 PUSH_REGS_HOST_TO_ABI0()
15
16 // Make room for arguments to cgocallback.
17 ADJSP $0x18
18#ifndef GOOS_windows
19 MOVQ DI, 0x0(SP) /* fn */
20 MOVQ SI, 0x8(SP) /* arg */
21 // Skip n in DX.
22 MOVQ CX, 0x10(SP) /* ctxt */
23#else
24 MOVQ CX, 0x0(SP) /* fn */
25 MOVQ DX, 0x8(SP) /* arg */
26 // Skip n in R8.
27 MOVQ R9, 0x10(SP) /* ctxt */
28#endif
29
30 CALL runtime·cgocallback(SB)
31
32 ADJSP $-0x18
33 POP_REGS_HOST_TO_ABI0()
34 RET
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