1 files changed, 72 insertions, 0 deletions
diff --git a/src/runtime/cgo/asm_amd64.s b/src/runtime/cgo/asm_amd64.s
new file mode 100644
index 0000000..5dc8e2d
--- /dev/null
+++ b/src/runtime/cgo/asm_amd64.s
@@ -0,0 +1,72 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// Called by C code generated by cmd/cgo.
+// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
+// Saves C callee-saved registers and calls cgocallback with three arguments.
+// fn is the PC of a func(a unsafe.Pointer) function.
+// This signature is known to SWIG, so we can't change it.
+#ifndef GOOS_windows
+TEXT crosscall2(SB),NOSPLIT,$0x50-0 /* keeps stack pointer 32-byte aligned */
+#else
+TEXT crosscall2(SB),NOSPLIT,$0x110-0 /* also need to save xmm6 - xmm15 */
+#endif
+	MOVQ	BX, 0x18(SP)
+	MOVQ	R12, 0x28(SP)
+	MOVQ	R13, 0x30(SP)
+	MOVQ	R14, 0x38(SP)
+	MOVQ	R15, 0x40(SP)
+
+#ifdef GOOS_windows
+	// Win64 save RBX, RBP, RDI, RSI, RSP, R12, R13, R14, R15 and XMM6 -- XMM15.
+	MOVQ	DI, 0x48(SP)
+	MOVQ	SI, 0x50(SP)
+	MOVUPS	X6, 0x60(SP)
+	MOVUPS	X7, 0x70(SP)
+	MOVUPS	X8, 0x80(SP)
+	MOVUPS	X9, 0x90(SP)
+	MOVUPS	X10, 0xa0(SP)
+	MOVUPS	X11, 0xb0(SP)
+	MOVUPS	X12, 0xc0(SP)
+	MOVUPS	X13, 0xd0(SP)
+	MOVUPS	X14, 0xe0(SP)
+	MOVUPS	X15, 0xf0(SP)
+
+	MOVQ	CX, 0x0(SP)	/* fn */
+	MOVQ	DX, 0x8(SP)	/* arg */
+	// Skip n in R8.
+	MOVQ	R9, 0x10(SP)	/* ctxt */
+
+	CALL	runtime·cgocallback(SB)
+
+	MOVQ	0x48(SP), DI
+	MOVQ	0x50(SP), SI
+	MOVUPS	0x60(SP), X6
+	MOVUPS	0x70(SP), X7
+	MOVUPS	0x80(SP), X8
+	MOVUPS	0x90(SP), X9
+	MOVUPS	0xa0(SP), X10
+	MOVUPS	0xb0(SP), X11
+	MOVUPS	0xc0(SP), X12
+	MOVUPS	0xd0(SP), X13
+	MOVUPS	0xe0(SP), X14
+	MOVUPS	0xf0(SP), X15
+#else
+	MOVQ	DI, 0x0(SP)	/* fn */
+	MOVQ	SI, 0x8(SP)	/* arg */
+	// Skip n in DX.
+	MOVQ	CX, 0x10(SP)	/* ctxt */
+
+	CALL	runtime·cgocallback(SB)
+#endif
+
+	MOVQ	0x18(SP), BX
+	MOVQ	0x28(SP), R12
+	MOVQ	0x30(SP), R13
+	MOVQ	0x38(SP), R14
+	MOVQ	0x40(SP), R15
+
+	RET