arch/x86/lib/gcc.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2009 coresystems GmbH
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0
   7  */
   8
   9 #ifdef __GNUC__
  10
  11 /*
  12  * GCC's libgcc handling is quite broken. While the libgcc functions
  13  * are always regparm(0) the code that calls them uses whatever the
  14  * compiler call specifies. Therefore we need a wrapper around those
  15  * functions. See gcc bug PR41055 for more information.
  16  */
  17 #define WRAP_LIBGCC_CALL(type, name) \
  18         type __normal_##name(type a, type b) __attribute__((regparm(0))); \
  19         type __wrap_##name(type a, type b); \
  20         type __attribute__((no_instrument_function)) \
  21                 __wrap_##name(type a, type b) \
  22                  { return __normal_##name(a, b); }
  23
  24 WRAP_LIBGCC_CALL(long long, __divdi3)
  25 WRAP_LIBGCC_CALL(unsigned long long, __udivdi3)
  26 WRAP_LIBGCC_CALL(long long, __moddi3)
  27 WRAP_LIBGCC_CALL(unsigned long long, __umoddi3)
  28
  29 #endif