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ea0b4e7c7d
This CL extends cmd/compile's experimental libFuzzer support with
calls to __sanitizer_cov_trace_{,const_}cmp{1,2,4,8}. This allows much
more efficient fuzzing of comparisons.
Only supports amd64 and arm64 for now.
Updates #14565.
Change-Id: Ibf82a8d9658f2bc50d955bdb1ae26723a3f0584d
Reviewed-on: https://go-review.googlesource.com/c/go/+/203887
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
32 lines
751 B
ArmAsm
32 lines
751 B
ArmAsm
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build libfuzzer
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#include "go_asm.h"
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#include "textflag.h"
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// Based on race_arm64.s; see commentary there.
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// func runtime·libfuzzerCall(fn, arg0, arg1 uintptr)
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// Calls C function fn from libFuzzer and passes 2 arguments to it.
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TEXT runtime·libfuzzerCall(SB), NOSPLIT, $0-24
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MOVD fn+0(FP), R9
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MOVD arg0+8(FP), R0
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MOVD arg1+16(FP), R1
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MOVD g_m(g), R10
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// Switch to g0 stack.
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MOVD RSP, R19 // callee-saved, preserved across the CALL
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MOVD m_g0(R10), R11
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CMP R11, g
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BEQ call // already on g0
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MOVD (g_sched+gobuf_sp)(R11), R12
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MOVD R12, RSP
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call:
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BL R9
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MOVD R19, RSP
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RET
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