| // Copyright 2022 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" |
| #include "abi_loong64.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 |
| MOVV _crosscall2_ptr(SB), R5 |
| MOVV $crosscall2_trampoline<>(SB), R6 |
| MOVV R6, (R5) |
| 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|NOFRAME,$0 |
| /* |
| * We still need to save all callee save register as before, and then |
| * push 3 args for fn (R4, R5, R7), skipping R6. |
| * Also note that at procedure entry in gc world, 8(R29) will be the |
| * first arg. |
| */ |
| |
| ADDV $(-23*8), R3 |
| MOVV R4, (1*8)(R3) // fn unsafe.Pointer |
| MOVV R5, (2*8)(R3) // a unsafe.Pointer |
| MOVV R7, (3*8)(R3) // ctxt uintptr |
| |
| SAVE_R22_TO_R31((4*8)) |
| SAVE_F24_TO_F31((14*8)) |
| MOVV R1, (22*8)(R3) |
| |
| // Initialize Go ABI environment |
| JAL runtime·load_g(SB) |
| |
| JAL runtime·cgocallback(SB) |
| |
| RESTORE_R22_TO_R31((4*8)) |
| RESTORE_F24_TO_F31((14*8)) |
| MOVV (22*8)(R3), R1 |
| |
| ADDV $(23*8), R3 |
| |
| RET |
