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