| // 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 |
