| // 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 路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路cgocallback(SB) | |
| MOVL 12(SP), DI | |
| MOVL 16(SP), SI | |
| MOVL 20(SP), BX | |
| MOVL 24(SP), BP | |
| RET | |