167 lines
3.6 KiB
C
167 lines
3.6 KiB
C
/* compiler-rt.c - compiler helpers. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010-2014 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/misc.h>
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#include <grub/compiler-rt.h>
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#if defined (__powerpc__)
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union component64
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{
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grub_uint64_t full;
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struct
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{
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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grub_uint32_t high;
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grub_uint32_t low;
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#else
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grub_uint32_t low;
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grub_uint32_t high;
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#endif
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};
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};
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/* Based on libgcc2.c from gcc suite. */
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grub_uint64_t
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__lshrdi3 (grub_uint64_t u, int b)
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{
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if (b == 0)
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return u;
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const union component64 uu = {.full = u};
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const int bm = 32 - b;
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union component64 w;
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if (bm <= 0)
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{
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w.high = 0;
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w.low = (grub_uint32_t) uu.high >> -bm;
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}
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else
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{
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const grub_uint32_t carries = (grub_uint32_t) uu.high << bm;
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w.high = (grub_uint32_t) uu.high >> b;
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w.low = ((grub_uint32_t) uu.low >> b) | carries;
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}
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return w.full;
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}
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/* Based on libgcc2.c from gcc suite. */
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grub_uint64_t
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__ashrdi3 (grub_uint64_t u, int b)
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{
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if (b == 0)
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return u;
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const union component64 uu = {.full = u};
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const int bm = 32 - b;
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union component64 w;
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if (bm <= 0)
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{
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/* w.high = 1..1 or 0..0 */
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w.high = uu.high >> (32 - 1);
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w.low = uu.high >> -bm;
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}
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else
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{
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const grub_uint32_t carries = (grub_uint32_t) uu.high << bm;
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w.high = uu.high >> b;
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w.low = ((grub_uint32_t) uu.low >> b) | carries;
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}
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return w.full;
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}
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/* Based on libgcc2.c from gcc suite. */
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grub_uint64_t
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__ashldi3 (grub_uint64_t u, int b)
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{
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if (b == 0)
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return u;
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const union component64 uu = {.full = u};
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const int bm = 32 - b;
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union component64 w;
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if (bm <= 0)
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{
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w.low = 0;
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w.high = (grub_uint32_t) uu.low << -bm;
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}
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else
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{
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const grub_uint32_t carries = (grub_uint32_t) uu.low >> bm;
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w.low = (grub_uint32_t) uu.low << b;
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w.high = ((grub_uint32_t) uu.high << b) | carries;
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}
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return w.full;
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}
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/* Based on libgcc2.c from gcc suite. */
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int
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__ucmpdi2 (grub_uint64_t a, grub_uint64_t b)
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{
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union component64 ac, bc;
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ac.full = a;
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bc.full = b;
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if (ac.high < bc.high)
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return 0;
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else if (ac.high > bc.high)
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return 2;
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if (ac.low < bc.low)
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return 0;
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else if (ac.low > bc.low)
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return 2;
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return 1;
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}
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/* Based on libgcc2.c from gcc suite. */
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grub_uint32_t
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__bswapsi2 (grub_uint32_t u)
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{
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return ((((u) & 0xff000000) >> 24)
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| (((u) & 0x00ff0000) >> 8)
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| (((u) & 0x0000ff00) << 8)
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| (((u) & 0x000000ff) << 24));
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}
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/* Based on libgcc2.c from gcc suite. */
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grub_uint64_t
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__bswapdi2 (grub_uint64_t u)
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{
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return ((((u) & 0xff00000000000000ull) >> 56)
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| (((u) & 0x00ff000000000000ull) >> 40)
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| (((u) & 0x0000ff0000000000ull) >> 24)
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| (((u) & 0x000000ff00000000ull) >> 8)
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| (((u) & 0x00000000ff000000ull) << 8)
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| (((u) & 0x0000000000ff0000ull) << 24)
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| (((u) & 0x000000000000ff00ull) << 40)
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| (((u) & 0x00000000000000ffull) << 56));
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}
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#endif
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