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 *
  28 memset (
  29   void    *dest,
  30   int     ch,
  31   size_t  count
  32   )
  33 {
  34   //
  35   // NOTE: Here we use one base implementation for memset, instead of the direct
  36   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  37   //       without whole program optimization option, and there will be some
  38   //       potential register usage errors when calling other optimized codes.
  39   //
  40
  41   //
  42   // Declare the local variables that actually move the data elements as
  43   // volatile to prevent the optimizer from replacing this function with
  44   // the intrinsic memset()
  45   //
  46   volatile UINT8  *Pointer;
  47
  48   Pointer = (UINT8 *)dest;
  49   while (count-- != 0) {
  50     *(Pointer++) = (UINT8)ch;
  51   }
  52
  53   return dest;
  54 }
  55
  56 /* Compare bytes in two buffers. */
  57 int
  58 memcmp (
  59   const void  *buf1,
  60   const void  *buf2,
  61   size_t      count
  62   )
  63 {
  64   return (int)CompareMem (buf1, buf2, count);
  65 }
  66
  67 int
  68 strcmp (
  69   const char  *s1,
  70   const char  *s2
  71   )
  72 {
  73   return (int)AsciiStrCmp (s1, s2);
  74 }