third_party/tcmalloc/vendor/src/malloc_hook_mmap_linux.h

   1 // Copyright (c) 2005, Google Inc.
   2 // All rights reserved.
   3 //
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   5 // modification, are permitted provided that the following conditions are
   6 // met:
   7 //
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   9 // notice, this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above
  11 // copyright notice, this list of conditions and the following disclaimer
  12 // in the documentation and/or other materials provided with the
  13 // distribution.
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  15 // contributors may be used to endorse or promote products derived from
  16 // this software without specific prior written permission.
  17 //
  18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 // ---
  31 // Author: Sanjay Ghemawat <opensource@google.com>
  32
  33 // We define mmap() and mmap64(), which somewhat reimplements libc's mmap
  34 // syscall stubs.  Unfortunately libc only exports the stubs via weak symbols
  35 // (which we're overriding with our mmap64() and mmap() wrappers) so we can't
  36 // just call through to them.
  37
  38 #ifndef __linux
  39 # error Should only be including malloc_hook_mmap_linux.h on linux systems.
  40 #endif
  41
  42 #include <unistd.h>
  43 #include <syscall.h>
  44 #include <sys/mman.h>
  45 #include <errno.h>
  46 #include "base/linux_syscall_support.h"
  47
  48 // The x86-32 case and the x86-64 case differ:
  49 // 32b has a mmap2() syscall, 64b does not.
  50 // 64b and 32b have different calling conventions for mmap().
  51
  52 // I test for 64-bit first so I don't have to do things like
  53 // '#if (defined(__mips__) && !defined(__MIPS64__))' as a mips32 check.
  54 #if defined(__x86_64__) || defined(__PPC64__) || (defined(_MIPS_SIM) && _MIPS_SIM == _ABI64)
  55
  56 static inline void* do_mmap64(void *start, size_t length,
  57                               int prot, int flags,
  58                               int fd, __off64_t offset) __THROW {
  59   return sys_mmap(start, length, prot, flags, fd, offset);
  60 }
  61
  62 #define MALLOC_HOOK_HAVE_DO_MMAP64 1
  63
  64 #elif defined(__i386__) || defined(__PPC__) || defined(__mips__) || \
  65       defined(__arm__)
  66
  67 static inline void* do_mmap64(void *start, size_t length,
  68                               int prot, int flags,
  69                               int fd, __off64_t offset) __THROW {
  70   void *result;
  71
  72   // Try mmap2() unless it's not supported
  73   static bool have_mmap2 = true;
  74   if (have_mmap2) {
  75     static int pagesize = 0;
  76     if (!pagesize) pagesize = getpagesize();
  77
  78     // Check that the offset is page aligned
  79     if (offset & (pagesize - 1)) {
  80       result = MAP_FAILED;
  81       errno = EINVAL;
  82       goto out;
  83     }
  84
  85     result = (void *)syscall(SYS_mmap2,
  86                              start, length, prot, flags, fd,
  87                              (off_t) (offset / pagesize));
  88     if (result != MAP_FAILED || errno != ENOSYS)  goto out;
  89
  90     // We don't have mmap2() after all - don't bother trying it in future
  91     have_mmap2 = false;
  92   }
  93
  94   if (((off_t)offset) != offset) {
  95     // If we're trying to map a 64-bit offset, fail now since we don't
  96     // have 64-bit mmap() support.
  97     result = MAP_FAILED;
  98     errno = EINVAL;
  99     goto out;
 100   }
 101
 102 #ifdef __NR_mmap
 103   {
 104     // Fall back to old 32-bit offset mmap() call
 105     // Old syscall interface cannot handle six args, so pass in an array
 106     int32 args[6] = { (int32) start, (int32) length, prot, flags, fd,
 107                       (off_t) offset };
 108     result = (void *)syscall(SYS_mmap, args);
 109   }
 110 #else
 111   // Some Linux ports like ARM EABI Linux has no mmap, just mmap2.
 112   result = MAP_FAILED;
 113 #endif
 114
 115  out:
 116   return result;
 117 }
 118
 119 #define MALLOC_HOOK_HAVE_DO_MMAP64 1
 120
 121 #endif  // #if defined(__x86_64__)
 122
 123
 124 #ifdef MALLOC_HOOK_HAVE_DO_MMAP64
 125
 126 // We use do_mmap64 abstraction to put MallocHook::InvokeMmapHook
 127 // calls right into mmap and mmap64, so that the stack frames in the caller's
 128 // stack are at the same offsets for all the calls of memory allocating
 129 // functions.
 130
 131 // Put all callers of MallocHook::Invoke* in this module into
 132 // malloc_hook section,
 133 // so that MallocHook::GetCallerStackTrace can function accurately:
 134
 135 // Make sure mmap doesn't get #define'd away by <sys/mman.h>
 136 # undef mmap
 137
 138 extern "C" {
 139   void* mmap64(void *start, size_t length, int prot, int flags,
 140                int fd, __off64_t offset  ) __THROW
 141     ATTRIBUTE_SECTION(malloc_hook);
 142   void* mmap(void *start, size_t length,int prot, int flags,
 143              int fd, off_t offset) __THROW
 144     ATTRIBUTE_SECTION(malloc_hook);
 145   int munmap(void* start, size_t length) __THROW
 146     ATTRIBUTE_SECTION(malloc_hook);
 147   void* mremap(void* old_addr, size_t old_size, size_t new_size,
 148                int flags, ...) __THROW
 149     ATTRIBUTE_SECTION(malloc_hook);
 150   void* sbrk(ptrdiff_t increment) __THROW
 151     ATTRIBUTE_SECTION(malloc_hook);
 152 }
 153
 154 extern "C" void* mmap64(void *start, size_t length, int prot, int flags,
 155                         int fd, __off64_t offset) __THROW {
 156   MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset);
 157   void *result;
 158   if (!MallocHook::InvokeMmapReplacement(
 159           start, length, prot, flags, fd, offset, &result)) {
 160     result = do_mmap64(start, length, prot, flags, fd, offset);
 161   }
 162   MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset);
 163   return result;
 164 }
 165
 166 # if !defined(__USE_FILE_OFFSET64) || !defined(__REDIRECT_NTH)
 167
 168 extern "C" void* mmap(void *start, size_t length, int prot, int flags,
 169                       int fd, off_t offset) __THROW {
 170   MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset);
 171   void *result;
 172   if (!MallocHook::InvokeMmapReplacement(
 173           start, length, prot, flags, fd, offset, &result)) {
 174     result = do_mmap64(start, length, prot, flags, fd,
 175                        static_cast<size_t>(offset)); // avoid sign extension
 176   }
 177   MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset);
 178   return result;
 179 }
 180
 181 # endif  // !defined(__USE_FILE_OFFSET64) || !defined(__REDIRECT_NTH)
 182
 183 extern "C" int munmap(void* start, size_t length) __THROW {
 184   MallocHook::InvokeMunmapHook(start, length);
 185   int result;
 186   if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
 187     result = sys_munmap(start, length);
 188   }
 189   return result;
 190 }
 191
 192 extern "C" void* mremap(void* old_addr, size_t old_size, size_t new_size,
 193                         int flags, ...) __THROW {
 194   va_list ap;
 195   va_start(ap, flags);
 196   void *new_address = va_arg(ap, void *);
 197   va_end(ap);
 198   void* result = sys_mremap(old_addr, old_size, new_size, flags, new_address);
 199   MallocHook::InvokeMremapHook(result, old_addr, old_size, new_size, flags,
 200                                new_address);
 201   return result;
 202 }
 203
 204 // libc's version:
 205 extern "C" void* __sbrk(ptrdiff_t increment);
 206
 207 extern "C" void* sbrk(ptrdiff_t increment) __THROW {
 208   MallocHook::InvokePreSbrkHook(increment);
 209   void *result = __sbrk(increment);
 210   MallocHook::InvokeSbrkHook(result, increment);
 211   return result;
 212 }
 213
 214 /*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot,
 215                                          int flags, int fd, off_t offset) {
 216   void* result;
 217   if (!MallocHook::InvokeMmapReplacement(
 218           start, length, prot, flags, fd, offset, &result)) {
 219     result = do_mmap64(start, length, prot, flags, fd, offset);
 220   }
 221   return result;
 222 }
 223
 224 /*static*/int MallocHook::UnhookedMUnmap(void *start, size_t length) {
 225   int result;
 226   if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
 227     result = syscall(SYS_munmap, start, length);
 228   }
 229   return result;
 230 }
 231
 232 #undef MALLOC_HOOK_HAVE_DO_MMAP64
 233
 234 #endif  // #ifdef MALLOC_HOOK_HAVE_DO_MMAP64