1 //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
6 //===----------------------------------------------------------------------===//
8 // Linux-specific syscall wrappers and classes.
10 //===----------------------------------------------------------------------===//
11 #ifndef SANITIZER_LINUX_H
12 #define SANITIZER_LINUX_H
14 #include "sanitizer_platform.h"
15 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
16 SANITIZER_OPENBSD || SANITIZER_SOLARIS
17 #include "sanitizer_common.h"
18 #include "sanitizer_internal_defs.h"
19 #include "sanitizer_platform_limits_netbsd.h"
20 #include "sanitizer_platform_limits_openbsd.h"
21 #include "sanitizer_platform_limits_posix.h"
22 #include "sanitizer_platform_limits_solaris.h"
23 #include "sanitizer_posix.h"
25 struct link_map
; // Opaque type returned by dlopen().
27 namespace __sanitizer
{
28 // Dirent structure for getdents(). Note that this structure is different from
29 // the one in <dirent.h>, which is used by readdir().
32 struct ProcSelfMapsBuff
{
38 struct MemoryMappingLayoutData
{
39 ProcSelfMapsBuff proc_self_maps
;
43 void ReadProcMaps(ProcSelfMapsBuff
*proc_maps
);
46 uptr
internal_getdents(fd_t fd
, struct linux_dirent
*dirp
, unsigned int count
);
47 uptr
internal_sigaltstack(const void* ss
, void* oss
);
48 uptr
internal_sigprocmask(int how
, __sanitizer_sigset_t
*set
,
49 __sanitizer_sigset_t
*oldset
);
50 uptr
internal_clock_gettime(__sanitizer_clockid_t clk_id
, void *tp
);
52 // Linux-only syscalls.
54 uptr
internal_prctl(int option
, uptr arg2
, uptr arg3
, uptr arg4
, uptr arg5
);
55 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used
56 // (like the process-wide error reporting SEGV handler) must use
57 // internal_sigaction instead.
58 int internal_sigaction_norestorer(int signum
, const void *act
, void *oldact
);
59 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
60 // Uses a raw system call to avoid interceptors.
61 int internal_sigaction_syscall(int signum
, const void *act
, void *oldact
);
63 void internal_sigdelset(__sanitizer_sigset_t
*set
, int signum
);
64 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
65 || defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \
67 uptr
internal_clone(int (*fn
)(void *), void *child_stack
, int flags
, void *arg
,
68 int *parent_tidptr
, void *newtls
, int *child_tidptr
);
70 #elif SANITIZER_FREEBSD
71 void internal_sigdelset(__sanitizer_sigset_t
*set
, int signum
);
72 #endif // SANITIZER_LINUX
74 // This class reads thread IDs from /proc/<pid>/task using only syscalls.
77 explicit ThreadLister(pid_t pid
);
84 Result
ListThreads(InternalMmapVector
<tid_t
> *threads
);
87 bool IsAlive(int tid
);
91 InternalMmapVector
<char> buffer_
;
94 // Exposed for testing.
95 uptr
ThreadDescriptorSize();
97 uptr
ThreadSelfOffset();
99 // Matches a library's file name against a base name (stripping path and version
101 bool LibraryNameIs(const char *full_name
, const char *base_name
);
103 // Call cb for each region mapped by map.
104 void ForEachMappedRegion(link_map
*map
, void (*cb
)(const void *, uptr
));
106 #if SANITIZER_ANDROID
108 #if defined(__aarch64__)
109 # define __get_tls() \
110 ({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
111 #elif defined(__arm__)
112 # define __get_tls() \
113 ({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
114 #elif defined(__mips__)
115 // On mips32r1, this goes via a kernel illegal instruction trap that's
117 # define __get_tls() \
118 ({ register void** __v asm("v1"); \
119 __asm__(".set push\n" \
122 ".set pop\n" : "=r"(__v)); \
124 #elif defined(__i386__)
125 # define __get_tls() \
126 ({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
127 #elif defined(__x86_64__)
128 # define __get_tls() \
129 ({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
131 #error "Unsupported architecture."
134 // The Android Bionic team has allocated a TLS slot for TSan starting with N,
135 // given that Android currently doesn't support ELF TLS. It is used to store
136 // Sanitizers thread specific data.
137 static const int TLS_SLOT_TSAN
= 8;
139 ALWAYS_INLINE uptr
*get_android_tls_ptr() {
140 return reinterpret_cast<uptr
*>(&__get_tls()[TLS_SLOT_TSAN
]);
143 #endif // SANITIZER_ANDROID
145 } // namespace __sanitizer
148 #endif // SANITIZER_LINUX_H