src/native_client/src/trusted/validator/x86/ncval_reg_sfi/address_sets_inl.c

   1 /*
   2  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7 /*
   8  * address_sets_inl.c - Holds inline routines for commonly used (simple)
   9  * functions in address_sets.h. Used to speed up code. Inlined routines
  10  * correspond to the following functions in address_sets.h, but with
  11  * an 'Inline' suffix:
  12  *
  13  *   NaClAddressSetAdd
  14  */
  15
  16 #ifndef NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_X86_NCVAL_REG_SFI_ADDRESS_SETS_INL_C__
  17 #define NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_X86_NCVAL_REG_SFI_ADDRESS_SETS_INL_C__
  18
  19 #include "native_client/src/trusted/validator/x86/ncval_reg_sfi/address_sets.h"
  20
  21 /* Model the offset created by removing the bottom three bits of a PcAddress. */
  22 typedef NaClPcAddress NaClPcOffset;
  23
  24 /* Model the set of possible 3-bit tails of possible PcAddresses. */
  25 static const uint8_t nacl_pc_address_masks[8] = {
  26   0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
  27
  28 /* Convert the 3 lower bits of an address into the corresponding address mask
  29  * to use.
  30  */
  31 static INLINE uint8_t NaClPcAddressToMask(NaClPcAddress address) {
  32   return nacl_pc_address_masks[(int) (address & (NaClPcAddress)0x7)];
  33 }
  34
  35 /* Convert an address into the corresponding offset in an address table.
  36  * That is, strip off the last three bits, since these remaining bits
  37  * will be encoded using the union of address masks in the address table.
  38  */
  39 static INLINE NaClPcOffset NaClPcAddressToOffset(NaClPcAddress address) {
  40   return address >> 3;
  41 }
  42
  43 /* Returns true if the given address is within the code segment. Generates
  44  * error messages if it isn't.
  45  */
  46 static INLINE Bool NaClCheckAddressRange(NaClPcAddress address,
  47                                          NaClValidatorState* state) {
  48   if (address >= state->codesize) {
  49     NaClValidatorPcAddressMessage(LOG_ERROR, state, address,
  50                                   "Jump to address outside code segment.\n");
  51     return FALSE;
  52   }
  53   return TRUE;
  54 }
  55
  56 static INLINE void NaClAddressSetAddInline(NaClAddressSet set,
  57                                            NaClPcAddress address,
  58                                            NaClValidatorState* state) {
  59   if (NaClCheckAddressRange(address, state)) {
  60     DEBUG(NaClLog(LOG_INFO,
  61                   "Address set add: %"NACL_PRIxNaClPcAddress"\n",
  62                   address));
  63     set[NaClPcAddressToOffset(address)] |= NaClPcAddressToMask(address);
  64   }
  65 }
  66
  67 #endif  /* NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_X86_NCVAL_REG_SFI_ADDRESS_SETS_INL_C__ */