src/lib/gcc.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2009 coresystems GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc.
  18  */
  19
  20 #include <arch/cpu.h>
  21
  22 /* GCC's libgcc handling is quite broken. While the libgcc functions
  23  * are always regparm(0) the code that calls them uses whatever the
  24  * compiler call specifies. Therefore we need a wrapper around those
  25  * functions. See gcc bug PR41055 for more information.
  26  */
  27
  28 /* TODO: maybe this code should move to arch/x86 as architecture
  29  * specific implementations may vary
  30  */
  31 #define WRAP_LIBGCC_CALL(type, name) \
  32         type __real_##name(type a, type b) asmlinkage; \
  33         type __wrap_##name(type a, type b); \
  34         type __wrap_##name(type a, type b) { return __real_##name(a, b); }
  35
  36 WRAP_LIBGCC_CALL(long long, __divdi3)
  37 WRAP_LIBGCC_CALL(unsigned long long, __udivdi3)
  38 WRAP_LIBGCC_CALL(long long, __moddi3)
  39 WRAP_LIBGCC_CALL(unsigned long long, __umoddi3)