hostregs_helper.h

   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