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6635f6fa94
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6778 c046a42c-6fe2-441c-8c8c-71466251a162
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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* Save/restore host registrs.
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*
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* Copyright (c) 2007 CodeSourcery
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
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*/
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/* The GCC global register variable extension is used to reserve some
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host registers for use by generated code. However only the core parts of
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the translation engine are compiled with these settings. We must manually
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save/restore these registers when called from regular code.
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It is not sufficient to save/restore T0 et. al. as these may be declared
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with a datatype smaller than the actual register. */
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#if defined(DECLARE_HOST_REGS)
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#define DO_REG(REG) \
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register host_reg_t reg_AREG##REG asm(AREG##REG); \
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volatile host_reg_t saved_AREG##REG;
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#elif defined(SAVE_HOST_REGS)
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#define DO_REG(REG) \
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__asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \
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saved_AREG##REG = reg_AREG##REG;
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#else
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#define DO_REG(REG) \
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reg_AREG##REG = saved_AREG##REG; \
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__asm__ __volatile__ ("" : : "r" (reg_AREG##REG));
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#endif
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#ifdef AREG0
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DO_REG(0)
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#endif
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#ifdef AREG1
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DO_REG(1)
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#endif
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#ifdef AREG2
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DO_REG(2)
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#endif
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#undef SAVE_HOST_REGS
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#undef DECLARE_HOST_REGS
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#undef DO_REG
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