1 //===-- xray_interface_internal.h -------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of XRay, a dynamic runtime instrumentation system. 10 // 11 // Implementation of the API functions. See also include/xray/xray_interface.h. 12 // 13 //===----------------------------------------------------------------------===// 14 #ifndef XRAY_INTERFACE_INTERNAL_H 15 #define XRAY_INTERFACE_INTERNAL_H 16 17 #include "sanitizer_common/sanitizer_platform.h" 18 #include "xray/xray_interface.h" 19 #include <cstddef> 20 #include <cstdint> 21 22 extern "C" { 23 24 struct XRaySledEntry { 25 #if SANITIZER_WORDSIZE == 64 26 uint64_t Address; 27 uint64_t Function; 28 unsigned char Kind; 29 unsigned char AlwaysInstrument; 30 unsigned char Version; 31 unsigned char Padding[13]; // Need 32 bytes functionXRaySledEntry32 uint64_t function() const { 33 // The target address is relative to the location of the Function variable. 34 return reinterpret_cast<uint64_t>(&Function) + Function; 35 } addressXRaySledEntry36 uint64_t address() const { 37 // The target address is relative to the location of the Address variable. 38 return reinterpret_cast<uint64_t>(&Address) + Address; 39 } 40 #elif SANITIZER_WORDSIZE == 32 41 uint32_t Address; 42 uint32_t Function; 43 unsigned char Kind; 44 unsigned char AlwaysInstrument; 45 unsigned char Version; 46 unsigned char Padding[5]; // Need 16 bytes 47 uint32_t function() const { 48 // The target address is relative to the location of the Function variable. 49 return reinterpret_cast<uint32_t>(&Function) + Function; 50 } 51 uint32_t address() const { 52 // The target address is relative to the location of the Address variable. 53 return reinterpret_cast<uint32_t>(&Address) + Address; 54 } 55 #else 56 #error "Unsupported word size." 57 #endif 58 }; 59 60 struct XRayFunctionSledIndex { 61 const XRaySledEntry *Begin; 62 size_t Size; 63 // For an entry in the xray_fn_idx section, the address is relative to the 64 // location of the Begin variable. fromPCRelativeXRayFunctionSledIndex65 const XRaySledEntry *fromPCRelative() const { 66 return reinterpret_cast<const XRaySledEntry *>(uintptr_t(&Begin) + 67 uintptr_t(Begin)); 68 } 69 }; 70 } 71 72 namespace __xray { 73 74 struct XRaySledMap { 75 const XRaySledEntry *Sleds; 76 size_t Entries; 77 const XRayFunctionSledIndex *SledsIndex; 78 size_t Functions; 79 }; 80 81 bool patchFunctionEntry(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled, 82 void (*Trampoline)()); 83 bool patchFunctionExit(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled); 84 bool patchFunctionTailExit(bool Enable, uint32_t FuncId, 85 const XRaySledEntry &Sled); 86 bool patchCustomEvent(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled); 87 bool patchTypedEvent(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled); 88 89 } // namespace __xray 90 91 extern "C" { 92 // The following functions have to be defined in assembler, on a per-platform 93 // basis. See xray_trampoline_*.S files for implementations. 94 extern void __xray_FunctionEntry(); 95 extern void __xray_FunctionExit(); 96 extern void __xray_FunctionTailExit(); 97 extern void __xray_ArgLoggerEntry(); 98 extern void __xray_CustomEvent(); 99 extern void __xray_TypedEvent(); 100 } 101 102 #endif 103