libfuzzer_arm64.s

     1  // Copyright 2019 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  //go:build libfuzzer
     6  
     7  #include "go_asm.h"
     8  #include "textflag.h"
     9  
    10  // Based on race_arm64.s; see commentary there.
    11  
    12  // func runtime·libfuzzerCall(fn, arg0, arg1 uintptr)
    13  // Calls C function fn from libFuzzer and passes 2 arguments to it.
    14  TEXT	runtime·libfuzzerCall(SB), NOSPLIT, $0-24
    15  	MOVD	fn+0(FP), R9
    16  	MOVD	arg0+8(FP), R0
    17  	MOVD	arg1+16(FP), R1
    18  
    19  	MOVD	g_m(g), R10
    20  
    21  	// Switch to g0 stack.
    22  	MOVD	RSP, R19	// callee-saved, preserved across the CALL
    23  	MOVD	m_g0(R10), R11
    24  	CMP	R11, g
    25  	BEQ	call	// already on g0
    26  	MOVD	(g_sched+gobuf_sp)(R11), R12
    27  	MOVD	R12, RSP
    28  call:
    29  	BL	R9
    30  	MOVD	R19, RSP
    31  	RET
    32
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