CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c

   1 /** @file
   2   Intrinsic Memory Routines Wrapper Implementation for OpenSSL-based
   3   Cryptographic Library.
   4
   5 Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Base.h>
  11 #include <Library/BaseMemoryLib.h>
  12 #include <Library/BaseLib.h>
  13
  14 typedef UINTN  size_t;
  15
  16 #if defined(__GNUC__) || defined(__clang__)
  17   #define GLOBAL_USED __attribute__((used))
  18 #else
  19   #define GLOBAL_USED
  20 #endif
  21
  22 /* OpenSSL will use floating point support, and C compiler produces the _fltused
  23    symbol by default. Simply define this symbol here to satisfy the linker. */
  24 int  GLOBAL_USED _fltused = 1;
  25
  26 /* Sets buffers to a specified character */
  27 void * memset (void *dest, int ch, size_t count)
  28 {
  29   //
  30   // NOTE: Here we use one base implementation for memset, instead of the direct
  31   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  32   //       without whole program optimization option, and there will be some
  33   //       potential register usage errors when calling other optimized codes.
  34   //
  35
  36   //
  37   // Declare the local variables that actually move the data elements as
  38   // volatile to prevent the optimizer from replacing this function with
  39   // the intrinsic memset()
  40   //
  41   volatile UINT8  *Pointer;
  42
  43   Pointer = (UINT8 *)dest;
  44   while (count-- != 0) {
  45     *(Pointer++) = (UINT8)ch;
  46   }
  47
  48   return dest;
  49 }
  50
  51 /* Compare bytes in two buffers. */
  52 int memcmp (const void *buf1, const void *buf2, size_t count)
  53 {
  54   return (int)CompareMem(buf1, buf2, count);
  55 }
  56
  57 int strcmp (const char *s1, const char *s2)
  58 {
  59   return (int)AsciiStrCmp(s1, s2);
  60 }