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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.
//go:build libfuzzer
// +build libfuzzer
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
// Based on race_amd64.s; see commentary there.
#ifdef GOOS_windows
#define RARG0 CX
#define RARG1 DX
#else
#define RARG0 DI
#define RARG1 SI
#endif
// void 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
MOVQ fn+0(FP), AX
MOVQ arg0+8(FP), RARG0
MOVQ arg1+16(FP), RARG1
get_tls(R12)
MOVQ g(R12), R14
MOVQ g_m(R14), R13
// Switch to g0 stack.
MOVQ SP, R12 // callee-saved, preserved across the CALL
MOVQ m_g0(R13), R10
CMPQ R10, R14
JE call // already on g0
MOVQ (g_sched+gobuf_sp)(R10), SP
call:
ANDQ $~15, SP // alignment for gcc ABI
CALL AX
MOVQ R12, SP
RET
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