asm_amd64.s RawHistoryFolder

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
19#ifndef GOOS_windows
20	MOVQ DI, 0x0(SP) // fn
21	MOVQ SI, 0x8(SP) // arg
22
23	// Skip n in DX.
24	MOVQ CX, 0x10(SP) // ctxt
25
26#else
27	MOVQ CX, 0x0(SP) // fn
28	MOVQ DX, 0x8(SP) // arg
29
30	// Skip n in R8.
31	MOVQ R9, 0x10(SP) // ctxt
32
33#endif
34
35	CALL runtime·cgocallback(SB)
36
37	ADJSP $-0x18
38	POP_REGS_HOST_TO_ABI0()
39	RET