43 lines
1.2 KiB
ArmAsm
43 lines
1.2 KiB
ArmAsm
// 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
|