asm_riscv64.s RawHistoryFolder

1// Copyright 2020 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#include "textflag.h"
6#include "abi_riscv64.h"
7
8// Called by C code generated by cmd/cgo.
9// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
10// Saves C callee-saved registers and calls cgocallback with three arguments.
11// fn is the PC of a func(a unsafe.Pointer) function.
12TEXT crosscall2(SB), NOSPLIT|NOFRAME, $0
13/*
14 * Push arguments for fn (X10, X11, X13), along with all callee-save
15 * registers. Note that at procedure entry the first argument is at
16 * 8(X2).
17 */
18	ADD $(-8*29), X2
19	MOV X10, (8*1)(X2) // fn unsafe.Pointer
20	MOV X11, (8*2)(X2) // a unsafe.Pointer
21	MOV X13, (8*3)(X2) // ctxt uintptr
22
23	SAVE_GPR((8*4))
24	MOV X1, (8*16)(X2)
25	SAVE_FPR((8*17))
26
27	// Initialize Go ABI environment
28	CALL runtime·load_g(SB)
29	CALL runtime·cgocallback(SB)
30
31	RESTORE_GPR((8*4))
32	MOV (8*16)(X2), X1
33	RESTORE_FPR((8*17))
34
35	ADD $(8*29), X2
36
37	RET