forked from OSchip/llvm-project
151 lines
4.8 KiB
C++
151 lines
4.8 KiB
C++
//===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Linux-specific syscall wrappers and classes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#ifndef SANITIZER_LINUX_H
|
|
#define SANITIZER_LINUX_H
|
|
|
|
#include "sanitizer_platform.h"
|
|
#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
|
|
SANITIZER_SOLARIS
|
|
#include "sanitizer_common.h"
|
|
#include "sanitizer_internal_defs.h"
|
|
#include "sanitizer_platform_limits_netbsd.h"
|
|
#include "sanitizer_platform_limits_posix.h"
|
|
#include "sanitizer_platform_limits_solaris.h"
|
|
#include "sanitizer_posix.h"
|
|
|
|
struct link_map; // Opaque type returned by dlopen().
|
|
|
|
namespace __sanitizer {
|
|
// Dirent structure for getdents(). Note that this structure is different from
|
|
// the one in <dirent.h>, which is used by readdir().
|
|
struct linux_dirent;
|
|
|
|
struct ProcSelfMapsBuff {
|
|
char *data;
|
|
uptr mmaped_size;
|
|
uptr len;
|
|
};
|
|
|
|
struct MemoryMappingLayoutData {
|
|
ProcSelfMapsBuff proc_self_maps;
|
|
const char *current;
|
|
};
|
|
|
|
void ReadProcMaps(ProcSelfMapsBuff *proc_maps);
|
|
|
|
// Syscall wrappers.
|
|
uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
|
|
uptr internal_sigaltstack(const void* ss, void* oss);
|
|
uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
|
|
__sanitizer_sigset_t *oldset);
|
|
uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp);
|
|
|
|
// Linux-only syscalls.
|
|
#if SANITIZER_LINUX
|
|
uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
|
|
// Used only by sanitizer_stoptheworld. Signal handlers that are actually used
|
|
// (like the process-wide error reporting SEGV handler) must use
|
|
// internal_sigaction instead.
|
|
int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
|
|
#if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
|
|
// Uses a raw system call to avoid interceptors.
|
|
int internal_sigaction_syscall(int signum, const void *act, void *oldact);
|
|
#endif
|
|
void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
|
|
#if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
|
|
|| defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \
|
|
|| defined(__arm__)
|
|
uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
int *parent_tidptr, void *newtls, int *child_tidptr);
|
|
#endif
|
|
#endif // SANITIZER_LINUX
|
|
|
|
// This class reads thread IDs from /proc/<pid>/task using only syscalls.
|
|
class ThreadLister {
|
|
public:
|
|
explicit ThreadLister(int pid);
|
|
~ThreadLister();
|
|
// GetNextTID returns -1 if the list of threads is exhausted, or if there has
|
|
// been an error.
|
|
int GetNextTID();
|
|
void Reset();
|
|
bool error();
|
|
|
|
private:
|
|
bool GetDirectoryEntries();
|
|
|
|
int pid_;
|
|
int descriptor_;
|
|
InternalScopedBuffer<char> buffer_;
|
|
bool error_;
|
|
struct linux_dirent* entry_;
|
|
int bytes_read_;
|
|
};
|
|
|
|
// Exposed for testing.
|
|
uptr ThreadDescriptorSize();
|
|
uptr ThreadSelf();
|
|
uptr ThreadSelfOffset();
|
|
|
|
// Matches a library's file name against a base name (stripping path and version
|
|
// information).
|
|
bool LibraryNameIs(const char *full_name, const char *base_name);
|
|
|
|
// Call cb for each region mapped by map.
|
|
void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
|
|
|
|
#if SANITIZER_ANDROID
|
|
|
|
#if defined(__aarch64__)
|
|
# define __get_tls() \
|
|
({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
|
|
#elif defined(__arm__)
|
|
# define __get_tls() \
|
|
({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
|
|
#elif defined(__mips__)
|
|
// On mips32r1, this goes via a kernel illegal instruction trap that's
|
|
// optimized for v1.
|
|
# define __get_tls() \
|
|
({ register void** __v asm("v1"); \
|
|
__asm__(".set push\n" \
|
|
".set mips32r2\n" \
|
|
"rdhwr %0,$29\n" \
|
|
".set pop\n" : "=r"(__v)); \
|
|
__v; })
|
|
#elif defined(__i386__)
|
|
# define __get_tls() \
|
|
({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
|
|
#elif defined(__x86_64__)
|
|
# define __get_tls() \
|
|
({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
|
|
#else
|
|
#error "Unsupported architecture."
|
|
#endif
|
|
|
|
// The Android Bionic team has allocated a TLS slot for TSan starting with N,
|
|
// given that Android currently doesn't support ELF TLS. It is used to store
|
|
// Sanitizers thread specific data.
|
|
static const int TLS_SLOT_TSAN = 8;
|
|
|
|
ALWAYS_INLINE uptr *get_android_tls_ptr() {
|
|
return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_TSAN]);
|
|
}
|
|
|
|
#endif // SANITIZER_ANDROID
|
|
|
|
} // namespace __sanitizer
|
|
|
|
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD ||
|
|
// SANITIZER_SOLARIS
|
|
#endif // SANITIZER_LINUX_H
|