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[XRay][AArch64] An attempt to fix test patching-unpatching.cc by flushing the instruction cache after code modification 

Summary: This patch attempts to fix test patching-unpatching.cc . The new code flushes the instruction cache after modifying the program at runtime.

Reviewers: dberris, rengolin

Subscribers: llvm-commits, iid_iunknown, aemerson

Differential Revision: https://reviews.llvm.org/D27996

llvm-svn: 290452
This commit is contained in:
Serge Rogatch 2016-12-23 21:21:01 +00:00
parent b322d1e6f0
commit 4ee228bf73
2 changed files with 6 additions and 2 deletions
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7
compiler-rt/lib/xray/xray_AArch64.cc
View File

@ -19,6 +19,8 @@
#include <atomic>
#include <cassert>
extern void __clear_cache(void* start, void* end);
namespace __xray {
uint64_t cycleFrequency() XRAY_NEVER_INSTRUMENT {
@ -75,8 +77,8 @@ inline static bool patchSled(const bool Enable, const uint32_t FuncId,
// B #32
uint32_t *FirstAddress = reinterpret_cast<uint32_t *>(Sled.Address);
uint32_t *CurAddress = FirstAddress + 1;
if (Enable) {
uint32_t *CurAddress = FirstAddress + 1;
*CurAddress = uint32_t(PatchOpcodes::PO_LdrW0_12);
CurAddress++;
*CurAddress = uint32_t(PatchOpcodes::PO_LdrX16_12);
@ -88,6 +90,7 @@ inline static bool patchSled(const bool Enable, const uint32_t FuncId,
*reinterpret_cast<void (**)()>(CurAddress) = TracingHook;
CurAddress += 2;
*CurAddress = uint32_t(PatchOpcodes::PO_LdpX0X30SP_16);
CurAddress++;
std::atomic_store_explicit(
reinterpret_cast<std::atomic<uint32_t> *>(FirstAddress),
uint32_t(PatchOpcodes::PO_StpX0X30SP_m16e), std::memory_order_release);
@ -96,6 +99,8 @@ inline static bool patchSled(const bool Enable, const uint32_t FuncId,
reinterpret_cast<std::atomic<uint32_t> *>(FirstAddress),
uint32_t(PatchOpcodes::PO_B32), std::memory_order_release);
}
__clear_cache(reinterpret_cast<char*>(FirstAddress),
reinterpret_cast<char*>(CurAddress));
return true;
}

1
compiler-rt/test/xray/TestCases/Linux/patching-unpatching.cc
View File

@ -3,7 +3,6 @@
//
// RUN: %clangxx_xray -fxray-instrument -std=c++11 %s -o %t
// RUN: XRAY_OPTIONS="patch_premain=false" %run %t 2>&1 | FileCheck %s
// REQUIRES: stable-runtime
#include "xray/xray_interface.h"