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| author | Serge Rogatch <srogatch@accesssoftek.com> | 2016-12-23 21:21:01 +0000 |
|---|---|---|
| committer | Serge Rogatch <srogatch@accesssoftek.com> | 2016-12-23 21:21:01 +0000 |
| commit | 7e0e37bd699e06c20dd5ba2adecbc8bffeacb3bd (patch) | |
| tree | ef1ae615163977f1f2db71f899c613b67973ae89 /lib/xray | |
| parent | 23f7d5a6ee27e8be5c1f01289059c27cc9bcddda (diff) | |
[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
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@290452 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/xray')
| -rw-r--r-- | lib/xray/xray_AArch64.cc | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/xray/xray_AArch64.cc b/lib/xray/xray_AArch64.cc index 8f24610da..5547ef730 100644 --- a/lib/xray/xray_AArch64.cc +++ b/lib/xray/xray_AArch64.cc @@ -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; } |