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// Copyright 2019 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.
// +build libfuzzer
#include "go_asm.h"
#include "textflag.h"
// Based on race_arm64.s; see commentary there.
// func runtime·libfuzzerCall(fn, arg0, arg1 uintptr)
// Calls C function fn from libFuzzer and passes 2 arguments to it.
TEXT runtime·libfuzzerCall(SB), NOSPLIT, $0-24
MOVD fn+0(FP), R9
MOVD arg0+8(FP), R0
MOVD arg1+16(FP), R1
MOVD g_m(g), R10
// Switch to g0 stack.
MOVD RSP, R19 // callee-saved, preserved across the CALL
MOVD m_g0(R10), R11
CMP R11, g
BEQ call // already on g0
MOVD (g_sched+gobuf_sp)(R11), R12
MOVD R12, RSP
call:
BL R9
MOVD R19, RSP
RET
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