CryptoPkg IntrinsicLib: Make _fltused always be used

[mirror_edk2.git] / CryptoPkg / Library / IntrinsicLib / MemoryIntrinsics.c

/** @file\r
  Intrinsic Memory Routines Wrapper Implementation for OpenSSL-based\r
  Cryptographic Library.\r
\r
Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Base.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/BaseLib.h>\r
\r
typedef UINTN  size_t;\r
\r
#if defined(__GNUC__) || defined(__clang__)\r
  #define GLOBAL_USED __attribute__((used))\r
#else\r
  #define GLOBAL_USED\r
#endif\r
\r
/* OpenSSL will use floating point support, and C compiler produces the _fltused\r
   symbol by default. Simply define this symbol here to satisfy the linker. */\r
int  GLOBAL_USED _fltused = 1;\r
\r
/* Sets buffers to a specified character */\r
void * memset (void *dest, int ch, size_t count)\r
{\r
  //\r
  // NOTE: Here we use one base implementation for memset, instead of the direct\r
  //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built\r
  //       without whole program optimization option, and there will be some\r
  //       potential register usage errors when calling other optimized codes.\r
  //\r
\r
  //\r
  // Declare the local variables that actually move the data elements as\r
  // volatile to prevent the optimizer from replacing this function with\r
  // the intrinsic memset()\r
  //\r
  volatile UINT8  *Pointer;\r
\r
  Pointer = (UINT8 *)dest;\r
  while (count-- != 0) {\r
    *(Pointer++) = (UINT8)ch;\r
  }\r
\r
  return dest;\r
}\r
\r
/* Compare bytes in two buffers. */\r
int memcmp (const void *buf1, const void *buf2, size_t count)\r
{\r
  return (int)CompareMem(buf1, buf2, count);\r
}\r
\r
int strcmp (const char *s1, const char *s2)\r
{\r
  return (int)AsciiStrCmp(s1, s2);\r
}\r