114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//===-- xray_powerpc64.cpp --------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a dynamic runtime instrumentation system.
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//
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// Implementation of powerpc64 and powerpc64le routines.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_common.h"
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#include "xray_defs.h"
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#include "xray_interface_internal.h"
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#include "xray_utils.h"
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#include <atomic>
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#include <cassert>
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#include <cstring>
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#ifndef __LITTLE_ENDIAN__
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#error powerpc64 big endian is not supported for now.
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#endif
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namespace {
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constexpr unsigned long long JumpOverInstNum = 7;
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void clearCache(void *Addr, size_t Len) {
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const size_t LineSize = 32;
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const intptr_t Mask = ~(LineSize - 1);
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const intptr_t StartLine = ((intptr_t)Addr) & Mask;
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const intptr_t EndLine = ((intptr_t)Addr + Len + LineSize - 1) & Mask;
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for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
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asm volatile("dcbf 0, %0" : : "r"(Line));
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asm volatile("sync");
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for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
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asm volatile("icbi 0, %0" : : "r"(Line));
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asm volatile("isync");
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}
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} // namespace
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extern "C" void __clear_cache(void *start, void *end);
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namespace __xray {
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bool patchFunctionEntry(const bool Enable, uint32_t FuncId,
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const XRaySledEntry &Sled,
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void (*Trampoline)()) XRAY_NEVER_INSTRUMENT {
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const uint64_t Address = Sled.address();
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if (Enable) {
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// lis 0, FuncId[16..32]
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// li 0, FuncId[0..15]
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*reinterpret_cast<uint64_t *>(Address) =
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(0x3c000000ull + (FuncId >> 16)) +
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((0x60000000ull + (FuncId & 0xffff)) << 32);
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} else {
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// b +JumpOverInstNum instructions.
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*reinterpret_cast<uint32_t *>(Address) =
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0x48000000ull + (JumpOverInstNum << 2);
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}
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clearCache(reinterpret_cast<void *>(Address), 8);
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return true;
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}
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bool patchFunctionExit(const bool Enable, uint32_t FuncId,
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const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
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const uint64_t Address = Sled.address();
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if (Enable) {
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// lis 0, FuncId[16..32]
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// li 0, FuncId[0..15]
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*reinterpret_cast<uint64_t *>(Address) =
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(0x3c000000ull + (FuncId >> 16)) +
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((0x60000000ull + (FuncId & 0xffff)) << 32);
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} else {
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// Copy the blr/b instruction after JumpOverInstNum instructions.
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*reinterpret_cast<uint32_t *>(Address) =
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*(reinterpret_cast<uint32_t *>(Address) + JumpOverInstNum);
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}
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clearCache(reinterpret_cast<void *>(Address), 8);
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return true;
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}
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bool patchFunctionTailExit(const bool Enable, const uint32_t FuncId,
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const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
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return patchFunctionExit(Enable, FuncId, Sled);
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}
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// FIXME: Maybe implement this better?
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bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
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bool patchCustomEvent(const bool Enable, const uint32_t FuncId,
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const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
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// FIXME: Implement in powerpc64?
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return false;
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}
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bool patchTypedEvent(const bool Enable, const uint32_t FuncId,
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const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
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// FIXME: Implement in powerpc64?
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return false;
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}
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} // namespace __xray
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extern "C" void __xray_ArgLoggerEntry() XRAY_NEVER_INSTRUMENT {
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// FIXME: this will have to be implemented in the trampoline assembly file
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}
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