sanitizer_posix.cc revision b84ee029ada36949c30c57c5f701191783990574 
1//===-- sanitizer_posix.cc ------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is shared between AddressSanitizer and ThreadSanitizer
11// run-time libraries and implements POSIX-specific functions from
12// sanitizer_libc.h.
13//===----------------------------------------------------------------------===//
14#if defined(__linux__) || defined(__APPLE__)
15
16#include "sanitizer_common.h"
17#include "sanitizer_libc.h"
18#include "sanitizer_procmaps.h"
19
20#include <pthread.h>
21#include <stdarg.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <sys/mman.h>
25#include <sys/resource.h>
26#include <sys/time.h>
27#include <sys/types.h>
28#include <unistd.h>
29
30#ifdef ANDROID
31#include <sys/atomics.h>
32#endif
33
34namespace __sanitizer {
35
36// ------------- sanitizer_common.h
37
38int GetPid() {
39  return getpid();
40}
41
42uptr GetThreadSelf() {
43  return (uptr)pthread_self();
44}
45
46void *MmapOrDie(uptr size, const char *mem_type) {
47  size = RoundUpTo(size, kPageSize);
48  void *res = internal_mmap(0, size,
49                            PROT_READ | PROT_WRITE,
50                            MAP_PRIVATE | MAP_ANON, -1, 0);
51  if (res == (void*)-1) {
52    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s\n",
53           size, size, mem_type);
54    CHECK("unable to mmap" && 0);
55  }
56  return res;
57}
58
59void UnmapOrDie(void *addr, uptr size) {
60  if (!addr || !size) return;
61  int res = internal_munmap(addr, size);
62  if (res != 0) {
63    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
64           size, size, addr);
65    CHECK("unable to unmap" && 0);
66  }
67}
68
69void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
70  return internal_mmap((void*)fixed_addr, size,
71                      PROT_READ | PROT_WRITE,
72                      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
73                      0, 0);
74}
75
76void *Mprotect(uptr fixed_addr, uptr size) {
77  return internal_mmap((void*)fixed_addr, size,
78                       PROT_NONE,
79                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
80                       0, 0);
81}
82
83static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
84                                        uptr start2, uptr end2) {
85  CHECK(start1 <= end1);
86  CHECK(start2 <= end2);
87  return (end1 < start2) || (end2 < start1);
88}
89
90// FIXME: this is thread-unsafe, but should not cause problems most of the time.
91// When the shadow is mapped only a single thread usually exists (plus maybe
92// several worker threads on Mac, which aren't expected to map big chunks of
93// memory).
94bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
95  ProcessMaps procmaps;
96  uptr start, end;
97  while (procmaps.Next(&start, &end,
98                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
99    if (!IntervalsAreSeparate(start, end, range_start, range_end))
100      return false;
101  }
102  return true;
103}
104
105void DumpProcessMap() {
106  ProcessMaps proc_maps;
107  uptr start, end;
108  const sptr kBufSize = 4095;
109  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
110  Report("Process memory map follows:\n");
111  while (proc_maps.Next(&start, &end, /* file_offset */0,
112                        filename, kBufSize)) {
113    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
114  }
115  Report("End of process memory map.\n");
116  UnmapOrDie(filename, kBufSize);
117}
118
119void DisableCoreDumper() {
120  struct rlimit nocore;
121  nocore.rlim_cur = 0;
122  nocore.rlim_max = 0;
123  setrlimit(RLIMIT_CORE, &nocore);
124}
125
126void SleepForSeconds(int seconds) {
127  sleep(seconds);
128}
129
130void Exit(int exitcode) {
131  _exit(exitcode);
132}
133
134void Abort() {
135  abort();
136}
137
138int Atexit(void (*function)(void)) {
139  return atexit(function);
140}
141
142int AtomicInc(int *a) {
143#ifdef ANDROID
144  return __atomic_inc(a) + 1;
145#else
146  return __sync_add_and_fetch(a, 1);
147#endif
148}
149
150u16 AtomicExchange(u16 *a, u16 new_val) {
151  return __sync_lock_test_and_set(a, new_val);
152}
153
154u8 AtomicExchange(u8 *a, u8 new_val) {
155  return __sync_lock_test_and_set(a, new_val);
156}
157
158// -------------- sanitizer_libc.h
159
160int internal_sscanf(const char *str, const char *format, ...) {
161  va_list args;
162  va_start(args, format);
163  int res = vsscanf(str, format, args);
164  va_end(args);
165  return res;
166}
167
168}  // namespace __sanitizer
169
170#endif  // __linux__ || __APPLE_
171