qemu/hostregs_helper.h
Anthony Liguori c227f0995e Revert "Get rid of _t suffix"
In the very least, a change like this requires discussion on the list.

The naming convention is goofy and it causes a massive merge problem.  Something
like this _must_ be presented on the list first so people can provide input
and cope with it.

This reverts commit 99a0949b72.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-01 16:12:16 -05:00

62 lines
1.8 KiB
C

/*
* Save/restore host registers.
*
* Copyright (c) 2007 CodeSourcery
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/* The GCC global register variable extension is used to reserve some
host registers for use by generated code. However only the core parts of
the translation engine are compiled with these settings. We must manually
save/restore these registers when called from regular code.
It is not sufficient to save/restore T0 et. al. as these may be declared
with a datatype smaller than the actual register. */
#if defined(DECLARE_HOST_REGS)
#define DO_REG(REG) \
register host_reg_t reg_AREG##REG asm(AREG##REG); \
volatile host_reg_t saved_AREG##REG;
#elif defined(SAVE_HOST_REGS)
#define DO_REG(REG) \
__asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \
saved_AREG##REG = reg_AREG##REG;
#else
#define DO_REG(REG) \
reg_AREG##REG = saved_AREG##REG; \
__asm__ __volatile__ ("" : : "r" (reg_AREG##REG));
#endif
#ifdef AREG0
DO_REG(0)
#endif
#ifdef AREG1
DO_REG(1)
#endif
#ifdef AREG2
DO_REG(2)
#endif
#undef SAVE_HOST_REGS
#undef DECLARE_HOST_REGS
#undef DO_REG