50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* _udivsi3 for Lattice Mico32.
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Contributed by Jon Beniston <jon@beniston.com>
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Copyright (C) 2009-2015 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgcc_lm32.h"
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/* Unsigned integer division. */
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USItype
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__udivsi3 (USItype a, USItype b)
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{
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if (b == 0)
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{
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/* Raise divide by zero exception. */
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int eba, sr;
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/* Save interrupt enable. */
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__asm__ __volatile__ ("rcsr %0, IE":"=r" (sr));
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sr = (sr & 1) << 1;
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__asm__ __volatile__ ("wcsr IE, %0"::"r" (sr));
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/* Branch to exception handler. */
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__asm__ __volatile__ ("rcsr %0, EBA":"=r" (eba));
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eba += 32 * 5;
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__asm__ __volatile__ ("mv ea, ra");
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__asm__ __volatile__ ("b %0"::"r" (eba));
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__builtin_unreachable ();
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}
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return __udivmodsi4 (a, b, 0);
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}
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