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 32 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 } 36 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 const XRaySledEntry *End; 63 }; 64 } 65 66 namespace __xray { 67 68 struct XRaySledMap { 69 const XRaySledEntry *Sleds; 70 size_t Entries; 71 const XRayFunctionSledIndex *SledsIndex; 72 size_t Functions; 73 }; 74 75 bool patchFunctionEntry(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled, 76 void (*Trampoline)()); 77 bool patchFunctionExit(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled); 78 bool patchFunctionTailExit(bool Enable, uint32_t FuncId, 79 const XRaySledEntry &Sled); 80 bool patchCustomEvent(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled); 81 bool patchTypedEvent(bool Enable, uint32_t FuncId, const XRaySledEntry &Sled); 82 83 } // namespace __xray 84 85 extern "C" { 86 // The following functions have to be defined in assembler, on a per-platform 87 // basis. See xray_trampoline_*.S files for implementations. 88 extern void __xray_FunctionEntry(); 89 extern void __xray_FunctionExit(); 90 extern void __xray_FunctionTailExit(); 91 extern void __xray_ArgLoggerEntry(); 92 extern void __xray_CustomEvent(); 93 extern void __xray_TypedEvent(); 94 } 95 96 #endif 97