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// 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"
// Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
// It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
// Use a local trampoline, to avoid taking the address of a dynamically exported
// function.
TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
MOVL _crosscall2_ptr(SB), AX
MOVL $crosscall2_trampoline<>(SB), BX
MOVL BX, (AX)
RET
TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
JMP crosscall2(SB)
// 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.
TEXT crosscall2(SB),NOSPLIT,$28-16
MOVL BP, 24(SP)
MOVL BX, 20(SP)
MOVL SI, 16(SP)
MOVL DI, 12(SP)
MOVL ctxt+12(FP), AX
MOVL AX, 8(SP)
MOVL a+4(FP), AX
MOVL AX, 4(SP)
MOVL fn+0(FP), AX
MOVL AX, 0(SP)
CALL runtime·cgocallback(SB)
MOVL 12(SP), DI
MOVL 16(SP), SI
MOVL 20(SP), BX
MOVL 24(SP), BP
RET
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