1    :  // Copyright 2012 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  //
  15    :  // Dummy CRT interceptors for the memory profiler. This is simply for
  16    :  // maintaining ABI compatibility.
  17    :  
  18  m :  extern "C" {
  19    :  
  20    :  // Memory probes are called with EDX on the stack, and the address to be
  21    :  // checked in EDX. Thus, the top of the stack is the return address and below
  22    :  // that is the original value of EDX.
  23    :  #define DEFINE_NULL_MEMORY_PROBE(name)  \
  24  m :    void __declspec(naked) name() {  \
  25  m :      /* Restore the value of EDX. */  \
  26  m :      __asm mov edx, DWORD PTR[esp + 4]  \
  27  m :      /* Return and pop the saved EDX value off the stack. */  \
  28  m :      __asm ret 4  \
  29  m :    }
  30    :  
  31    :  // Special instruction takes their addresses directly in some known registers,
  32    :  // so no extra information gets pushed onto the stack and there's nothing to
  33    :  // clean, we can simply return.
  34    :  #define DEFINE_NULL_SPECIAL_PROBE(name)  \
  35  m :    void __declspec(naked) name() {  \
  36  m :      __asm ret  \
  37  m :    }
  38    :  
  39    :  // Define all of the null memory probes.
  40  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_1_byte_read_access);
  41  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_2_byte_read_access);
  42  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_4_byte_read_access);
  43  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_8_byte_read_access);
  44  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_10_byte_read_access);
  45  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_16_byte_read_access);
  46  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_32_byte_read_access);
  47  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_1_byte_write_access);
  48  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_2_byte_write_access);
  49  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_4_byte_write_access);
  50  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_8_byte_write_access);
  51  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_10_byte_write_access);
  52  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_16_byte_write_access);
  53  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_32_byte_write_access);
  54  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_1_byte_read_access_no_flags);
  55  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_2_byte_read_access_no_flags);
  56  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_4_byte_read_access_no_flags);
  57  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_8_byte_read_access_no_flags);
  58  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_10_byte_read_access_no_flags);
  59  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_16_byte_read_access_no_flags);
  60  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_32_byte_read_access_no_flags);
  61  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_1_byte_write_access_no_flags);
  62  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_2_byte_write_access_no_flags);
  63  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_4_byte_write_access_no_flags);
  64  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_8_byte_write_access_no_flags);
  65  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_10_byte_write_access_no_flags);
  66  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_16_byte_write_access_no_flags);
  67  m :  DEFINE_NULL_MEMORY_PROBE(asan_check_32_byte_write_access_no_flags);
  68  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_1_byte_cmps_access);
  69  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_2_byte_cmps_access);
  70  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_4_byte_cmps_access);
  71  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_1_byte_movs_access);
  72  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_2_byte_movs_access);
  73  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_4_byte_movs_access);
  74  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_1_byte_stos_access);
  75  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_2_byte_stos_access);
  76  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_repz_4_byte_stos_access);
  77  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_1_byte_cmps_access);
  78  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_2_byte_cmps_access);
  79  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_4_byte_cmps_access);
  80  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_1_byte_movs_access);
  81  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_2_byte_movs_access);
  82  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_4_byte_movs_access);
  83  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_1_byte_stos_access);
  84  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_2_byte_stos_access);
  85  m :  DEFINE_NULL_SPECIAL_PROBE(asan_check_4_byte_stos_access);
  86    :  #undef DEFINE_NULL_MEMORY_PROBE
  87    :  #undef DEFINE_NULL_STRING_PROBE
  88    :  
  89  m :  }  // extern "C"