File:  [Qemu by Fabrice Bellard] / qemu / hostregs_helper.h
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:23 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

    1: /*
    2:  *  Save/restore host registrs.
    3:  *
    4:  *  Copyright (c) 2007 CodeSourcery
    5:  *
    6:  * This library is free software; you can redistribute it and/or
    7:  * modify it under the terms of the GNU Lesser General Public
    8:  * License as published by the Free Software Foundation; either
    9:  * version 2 of the License, or (at your option) any later version.
   10:  *
   11:  * This library is distributed in the hope that it will be useful,
   12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14:  * Lesser General Public License for more details.
   15:  *
   16:  * You should have received a copy of the GNU Lesser General Public
   17:  * License along with this library; if not, write to the Free Software
   18:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
   19:  */
   20: 
   21: /* The GCC global register variable extension is used to reserve some
   22:    host registers for use by generated code.  However only the core parts of
   23:    the translation engine are compiled with these settings.  We must manually
   24:    save/restore these registers when called from regular code.
   25:    It is not sufficient to save/restore T0 et. al. as these may be declared
   26:    with a datatype smaller than the actual register.  */
   27: 
   28: #if defined(DECLARE_HOST_REGS)
   29: 
   30: #define DO_REG(REG)					\
   31:     register host_reg_t reg_AREG##REG asm(AREG##REG);	\
   32:     volatile host_reg_t saved_AREG##REG;
   33: 
   34: #elif defined(SAVE_HOST_REGS)
   35: 
   36: #define DO_REG(REG)					\
   37:     __asm__ __volatile__ ("" : "=r" (reg_AREG##REG));	\
   38:     saved_AREG##REG = reg_AREG##REG;
   39: 
   40: #else
   41: 
   42: #define DO_REG(REG)                                     \
   43:     reg_AREG##REG = saved_AREG##REG;		        \
   44:     __asm__ __volatile__ ("" : : "r" (reg_AREG##REG));
   45: 
   46: #endif
   47: 
   48: #ifdef AREG0
   49: DO_REG(0)
   50: #endif
   51: 
   52: #ifdef AREG1
   53: DO_REG(1)
   54: #endif
   55: 
   56: #ifdef AREG2
   57: DO_REG(2)
   58: #endif
   59: 
   60: #ifdef AREG3
   61: DO_REG(3)
   62: #endif
   63: 
   64: #ifdef AREG4
   65: DO_REG(4)
   66: #endif
   67: 
   68: #ifdef AREG5
   69: DO_REG(5)
   70: #endif
   71: 
   72: #ifdef AREG6
   73: DO_REG(6)
   74: #endif
   75: 
   76: #ifdef AREG7
   77: DO_REG(7)
   78: #endif
   79: 
   80: #ifdef AREG8
   81: DO_REG(8)
   82: #endif
   83: 
   84: #ifdef AREG9
   85: DO_REG(9)
   86: #endif
   87: 
   88: #ifdef AREG10
   89: DO_REG(10)
   90: #endif
   91: 
   92: #ifdef AREG11
   93: DO_REG(11)
   94: #endif
   95: 
   96: #undef SAVE_HOST_REGS
   97: #undef DECLARE_HOST_REGS
   98: #undef DO_REG

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