1//===-- sanitizer_procmaps_linux.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// Information about the process mappings (Linux-specific parts).
11//===----------------------------------------------------------------------===//
12
13#include "sanitizer_platform.h"
14#if SANITIZER_LINUX
15#include "sanitizer_common.h"
16#include "sanitizer_procmaps.h"
17
18namespace __sanitizer {
19
20void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
21  CHECK(ReadFileToBuffer("/proc/self/maps", &proc_maps->data,
22                         &proc_maps->mmaped_size, &proc_maps->len));
23}
24
25static bool IsOneOf(char c, char c1, char c2) {
26  return c == c1 || c == c2;
27}
28
29bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
30                               char filename[], uptr filename_size,
31                               uptr *protection) {
32  char *last = proc_self_maps_.data + proc_self_maps_.len;
33  if (current_ >= last) return false;
34  uptr dummy;
35  if (!start) start = &dummy;
36  if (!end) end = &dummy;
37  if (!offset) offset = &dummy;
38  if (!protection) protection = &dummy;
39  char *next_line = (char*)internal_memchr(current_, '\n', last - current_);
40  if (next_line == 0)
41    next_line = last;
42  // Example: 08048000-08056000 r-xp 00000000 03:0c 64593   /foo/bar
43  *start = ParseHex(&current_);
44  CHECK_EQ(*current_++, '-');
45  *end = ParseHex(&current_);
46  CHECK_EQ(*current_++, ' ');
47  CHECK(IsOneOf(*current_, '-', 'r'));
48  *protection = 0;
49  if (*current_++ == 'r')
50    *protection |= kProtectionRead;
51  CHECK(IsOneOf(*current_, '-', 'w'));
52  if (*current_++ == 'w')
53    *protection |= kProtectionWrite;
54  CHECK(IsOneOf(*current_, '-', 'x'));
55  if (*current_++ == 'x')
56    *protection |= kProtectionExecute;
57  CHECK(IsOneOf(*current_, 's', 'p'));
58  if (*current_++ == 's')
59    *protection |= kProtectionShared;
60  CHECK_EQ(*current_++, ' ');
61  *offset = ParseHex(&current_);
62  CHECK_EQ(*current_++, ' ');
63  ParseHex(&current_);
64  CHECK_EQ(*current_++, ':');
65  ParseHex(&current_);
66  CHECK_EQ(*current_++, ' ');
67  while (IsDecimal(*current_))
68    current_++;
69  // Qemu may lack the trailing space.
70  // https://github.com/google/sanitizers/issues/160
71  // CHECK_EQ(*current_++, ' ');
72  // Skip spaces.
73  while (current_ < next_line && *current_ == ' ')
74    current_++;
75  // Fill in the filename.
76  uptr i = 0;
77  while (current_ < next_line) {
78    if (filename && i < filename_size - 1)
79      filename[i++] = *current_;
80    current_++;
81  }
82  if (filename && i < filename_size)
83    filename[i] = 0;
84  current_ = next_line + 1;
85  return true;
86}
87
88}  // namespace __sanitizer
89
90#endif  // SANITIZER_LINUX
91