Archipelago » qemu

/*

 *  Save/restore host registrs.

 *

 *  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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

/* The GCC global register vairable extension is used to reserve some

   host registers for use by dyngen.  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

#ifdef AREG3

DO_REG(3)

#endif

#ifdef AREG4

DO_REG(4)

#endif

#ifdef AREG5

DO_REG(5)

#endif

#ifdef AREG6

DO_REG(6)

#endif

#ifdef AREG7

DO_REG(7)

#endif

#ifdef AREG8

DO_REG(8)

#endif

#ifdef AREG9

DO_REG(9)

#endif

#ifdef AREG10

DO_REG(10)

#endif

#ifdef AREG11

DO_REG(11)

#endif

#undef SAVE_HOST_REGS

#undef DECLARE_HOST_REGS

#undef DO_REG