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-rw-r--r--lib/xray/xray_powerpc64.cpp111
1 files changed, 111 insertions, 0 deletions
diff --git a/lib/xray/xray_powerpc64.cpp b/lib/xray/xray_powerpc64.cpp
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+++ b/lib/xray/xray_powerpc64.cpp
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+//===-- 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 {
+ if (Enable) {
+ // lis 0, FuncId[16..32]
+ // li 0, FuncId[0..15]
+ *reinterpret_cast<uint64_t *>(Sled.Address) =
+ (0x3c000000ull + (FuncId >> 16)) +
+ ((0x60000000ull + (FuncId & 0xffff)) << 32);
+ } else {
+ // b +JumpOverInstNum instructions.
+ *reinterpret_cast<uint32_t *>(Sled.Address) =
+ 0x48000000ull + (JumpOverInstNum << 2);
+ }
+ clearCache(reinterpret_cast<void *>(Sled.Address), 8);
+ return true;
+}
+
+bool patchFunctionExit(const bool Enable, uint32_t FuncId,
+ const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
+ if (Enable) {
+ // lis 0, FuncId[16..32]
+ // li 0, FuncId[0..15]
+ *reinterpret_cast<uint64_t *>(Sled.Address) =
+ (0x3c000000ull + (FuncId >> 16)) +
+ ((0x60000000ull + (FuncId & 0xffff)) << 32);
+ } else {
+ // Copy the blr/b instruction after JumpOverInstNum instructions.
+ *reinterpret_cast<uint32_t *>(Sled.Address) =
+ *(reinterpret_cast<uint32_t *>(Sled.Address) + JumpOverInstNum);
+ }
+ clearCache(reinterpret_cast<void *>(Sled.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
+}