1 //===-- asan_internal.h -----------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of AddressSanitizer, an address sanity checker.
12 // ASan-private header which defines various general utilities.
13 //===----------------------------------------------------------------------===//
14 #ifndef ASAN_INTERNAL_H
15 #define ASAN_INTERNAL_H
17 #include "asan_flags.h"
18 #include "asan_interface_internal.h"
19 #include "sanitizer_common/sanitizer_common.h"
20 #include "sanitizer_common/sanitizer_internal_defs.h"
21 #include "sanitizer_common/sanitizer_stacktrace.h"
22 #include "sanitizer_common/sanitizer_libc.h"
24 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
25 # error "The AddressSanitizer run-time should not be"
26 " instrumented by AddressSanitizer"
29 // Build-time configuration options.
31 // If set, asan will intercept C++ exception api call(s).
32 #ifndef ASAN_HAS_EXCEPTIONS
33 # define ASAN_HAS_EXCEPTIONS 1
36 // If set, values like allocator chunk size, as well as defaults for some flags
37 // will be changed towards less memory overhead.
38 #ifndef ASAN_LOW_MEMORY
39 # if SANITIZER_IOS || SANITIZER_ANDROID || SANITIZER_RTEMS
40 # define ASAN_LOW_MEMORY 1
42 # define ASAN_LOW_MEMORY 0
48 # define ASAN_DYNAMIC 1
50 # define ASAN_DYNAMIC 0
54 // All internal functions in asan reside inside the __asan namespace
55 // to avoid namespace collisions with the user programs.
56 // Separate namespace also makes it simpler to distinguish the asan run-time
57 // functions from the instrumented user code in a profile.
61 using __sanitizer::StackTrace;
63 void AsanInitFromRtl();
66 void InitializePlatformExceptionHandlers();
67 // Returns whether an address is a valid allocated system heap block.
68 // 'addr' must point to the beginning of the block.
69 bool IsSystemHeapAddress(uptr addr);
72 void PrintAddressSpaceLayout();
73 void NORETURN ShowStatsAndAbort();
75 // asan_shadow_setup.cc
76 void InitializeShadowMemory();
78 // asan_malloc_linux.cc / asan_malloc_mac.cc
79 void ReplaceSystemMalloc();
81 // asan_linux.cc / asan_mac.cc / asan_rtems.cc / asan_win.cc
82 uptr FindDynamicShadowStart();
83 void *AsanDoesNotSupportStaticLinkage();
84 void AsanCheckDynamicRTPrereqs();
85 void AsanCheckIncompatibleRT();
88 AsanThread *CreateMainThread();
90 // Support function for __asan_(un)register_image_globals. Searches for the
91 // loaded image containing `needle' and then enumerates all global metadata
92 // structures declared in that image, applying `op' (e.g.,
93 // __asan_(un)register_globals) to them.
94 typedef void (*globals_op_fptr)(__asan_global *, uptr);
95 void AsanApplyToGlobals(globals_op_fptr op, const void *needle);
97 void AsanOnDeadlySignal(int, void *siginfo, void *context);
99 void ReadContextStack(void *context, uptr *stack, uptr *ssize);
100 void StopInitOrderChecking();
102 // Wrapper for TLS/TSD.
103 void AsanTSDInit(void (*destructor)(void *tsd));
105 void AsanTSDSet(void *tsd);
106 void PlatformTSDDtor(void *tsd);
108 void AppendToErrorMessageBuffer(const char *buffer);
110 void *AsanDlSymNext(const char *sym);
112 void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name);
114 // Add convenient macro for interface functions that may be represented as
116 #define ASAN_MALLOC_HOOK(ptr, size) \
118 if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(ptr, size); \
119 RunMallocHooks(ptr, size); \
121 #define ASAN_FREE_HOOK(ptr) \
123 if (&__sanitizer_free_hook) __sanitizer_free_hook(ptr); \
126 #define ASAN_ON_ERROR() \
127 if (&__asan_on_error) __asan_on_error()
129 extern int asan_inited;
130 // Used to avoid infinite recursion in __asan_init().
131 extern bool asan_init_is_running;
132 extern void (*death_callback)(void);
133 // These magic values are written to shadow for better error reporting.
134 const int kAsanHeapLeftRedzoneMagic = 0xfa;
135 const int kAsanHeapFreeMagic = 0xfd;
136 const int kAsanStackLeftRedzoneMagic = 0xf1;
137 const int kAsanStackMidRedzoneMagic = 0xf2;
138 const int kAsanStackRightRedzoneMagic = 0xf3;
139 const int kAsanStackAfterReturnMagic = 0xf5;
140 const int kAsanInitializationOrderMagic = 0xf6;
141 const int kAsanUserPoisonedMemoryMagic = 0xf7;
142 const int kAsanContiguousContainerOOBMagic = 0xfc;
143 const int kAsanStackUseAfterScopeMagic = 0xf8;
144 const int kAsanGlobalRedzoneMagic = 0xf9;
145 const int kAsanInternalHeapMagic = 0xfe;
146 const int kAsanArrayCookieMagic = 0xac;
147 const int kAsanIntraObjectRedzone = 0xbb;
148 const int kAsanAllocaLeftMagic = 0xca;
149 const int kAsanAllocaRightMagic = 0xcb;
150 // Used to populate the shadow gap for systems without memory
151 // protection there (i.e. Myriad).
152 const int kAsanShadowGap = 0xcc;
154 static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
155 static const uptr kRetiredStackFrameMagic = 0x45E0360E;
157 } // namespace __asan
159 #endif // ASAN_INTERNAL_H