Retro68/gcc/libsanitizer/sanitizer_common/sanitizer_procmaps_linux.cc

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2015-08-28 15:33:40 +00:00
//===-- sanitizer_procmaps_linux.cc ---------------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Information about the process mappings (Linux-specific parts).
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_LINUX
#include "sanitizer_common.h"
#include "sanitizer_procmaps.h"
namespace __sanitizer {
void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
proc_maps->len = ReadFileToBuffer("/proc/self/maps", &proc_maps->data,
&proc_maps->mmaped_size, 1 << 26);
}
static bool IsOneOf(char c, char c1, char c2) {
return c == c1 || c == c2;
}
bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
char filename[], uptr filename_size,
uptr *protection) {
char *last = proc_self_maps_.data + proc_self_maps_.len;
if (current_ >= last) return false;
uptr dummy;
if (!start) start = &dummy;
if (!end) end = &dummy;
if (!offset) offset = &dummy;
if (!protection) protection = &dummy;
char *next_line = (char*)internal_memchr(current_, '\n', last - current_);
if (next_line == 0)
next_line = last;
// Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar
*start = ParseHex(&current_);
CHECK_EQ(*current_++, '-');
*end = ParseHex(&current_);
CHECK_EQ(*current_++, ' ');
CHECK(IsOneOf(*current_, '-', 'r'));
*protection = 0;
if (*current_++ == 'r')
*protection |= kProtectionRead;
CHECK(IsOneOf(*current_, '-', 'w'));
if (*current_++ == 'w')
*protection |= kProtectionWrite;
CHECK(IsOneOf(*current_, '-', 'x'));
if (*current_++ == 'x')
*protection |= kProtectionExecute;
CHECK(IsOneOf(*current_, 's', 'p'));
if (*current_++ == 's')
*protection |= kProtectionShared;
CHECK_EQ(*current_++, ' ');
*offset = ParseHex(&current_);
CHECK_EQ(*current_++, ' ');
ParseHex(&current_);
CHECK_EQ(*current_++, ':');
ParseHex(&current_);
CHECK_EQ(*current_++, ' ');
while (IsDecimal(*current_))
current_++;
// Qemu may lack the trailing space.
// http://code.google.com/p/address-sanitizer/issues/detail?id=160
// CHECK_EQ(*current_++, ' ');
// Skip spaces.
while (current_ < next_line && *current_ == ' ')
current_++;
// Fill in the filename.
uptr i = 0;
while (current_ < next_line) {
if (filename && i < filename_size - 1)
filename[i++] = *current_;
current_++;
}
if (filename && i < filename_size)
filename[i] = 0;
current_ = next_line + 1;
return true;
}
} // namespace __sanitizer
#endif // SANITIZER_LINUX