54 lines
1.5 KiB
ArmAsm
54 lines
1.5 KiB
ArmAsm
// 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
|