root / hostregs_helper.h @ c4c38c8c
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1 | 1057eaa7 | pbrook | /*
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2 | cc5f688d | Stefan Weil | * Save/restore host registers.
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3 | 1057eaa7 | pbrook | *
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4 | 1057eaa7 | pbrook | * Copyright (c) 2007 CodeSourcery
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5 | 1057eaa7 | pbrook | *
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6 | 1057eaa7 | pbrook | * This library is free software; you can redistribute it and/or
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7 | 1057eaa7 | pbrook | * modify it under the terms of the GNU Lesser General Public
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8 | 1057eaa7 | pbrook | * License as published by the Free Software Foundation; either
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9 | 1057eaa7 | pbrook | * version 2 of the License, or (at your option) any later version.
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10 | 1057eaa7 | pbrook | *
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11 | 1057eaa7 | pbrook | * This library is distributed in the hope that it will be useful,
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12 | 1057eaa7 | pbrook | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 1057eaa7 | pbrook | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 1057eaa7 | pbrook | * Lesser General Public License for more details.
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15 | 1057eaa7 | pbrook | *
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16 | 1057eaa7 | pbrook | * You should have received a copy of the GNU Lesser General Public
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17 | 8167ee88 | Blue Swirl | * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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18 | 1057eaa7 | pbrook | */
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19 | 1057eaa7 | pbrook | |
20 | 54604f74 | aurel32 | /* The GCC global register variable extension is used to reserve some
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21 | 54604f74 | aurel32 | host registers for use by generated code. However only the core parts of
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22 | 54604f74 | aurel32 | the translation engine are compiled with these settings. We must manually
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23 | 1057eaa7 | pbrook | save/restore these registers when called from regular code.
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24 | 1057eaa7 | pbrook | It is not sufficient to save/restore T0 et. al. as these may be declared
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25 | 1057eaa7 | pbrook | with a datatype smaller than the actual register. */
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26 | 1057eaa7 | pbrook | |
27 | 1057eaa7 | pbrook | #if defined(DECLARE_HOST_REGS)
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28 | 1057eaa7 | pbrook | |
29 | 1057eaa7 | pbrook | #define DO_REG(REG) \
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30 | c227f099 | Anthony Liguori | register host_reg_t reg_AREG##REG asm(AREG##REG); \ |
31 | c227f099 | Anthony Liguori | volatile host_reg_t saved_AREG##REG; |
32 | 1057eaa7 | pbrook | |
33 | 1057eaa7 | pbrook | #elif defined(SAVE_HOST_REGS)
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34 | 1057eaa7 | pbrook | |
35 | 1057eaa7 | pbrook | #define DO_REG(REG) \
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36 | 1057eaa7 | pbrook | __asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \ |
37 | 1057eaa7 | pbrook | saved_AREG##REG = reg_AREG##REG; |
38 | 1057eaa7 | pbrook | |
39 | 1057eaa7 | pbrook | #else
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40 | 1057eaa7 | pbrook | |
41 | 1057eaa7 | pbrook | #define DO_REG(REG) \
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42 | 1057eaa7 | pbrook | reg_AREG##REG = saved_AREG##REG; \ |
43 | 1057eaa7 | pbrook | __asm__ __volatile__ ("" : : "r" (reg_AREG##REG)); |
44 | 1057eaa7 | pbrook | |
45 | 1057eaa7 | pbrook | #endif
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46 | 1057eaa7 | pbrook | |
47 | 1057eaa7 | pbrook | #ifdef AREG0
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48 | 1057eaa7 | pbrook | DO_REG(0)
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49 | 1057eaa7 | pbrook | #endif
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50 | 1057eaa7 | pbrook | |
51 | 1057eaa7 | pbrook | #ifdef AREG1
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52 | 1057eaa7 | pbrook | DO_REG(1)
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53 | 1057eaa7 | pbrook | #endif
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54 | 1057eaa7 | pbrook | |
55 | 1057eaa7 | pbrook | #ifdef AREG2
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56 | 1057eaa7 | pbrook | DO_REG(2)
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57 | 1057eaa7 | pbrook | #endif
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58 | 1057eaa7 | pbrook | |
59 | 1057eaa7 | pbrook | #undef SAVE_HOST_REGS
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60 | 1057eaa7 | pbrook | #undef DECLARE_HOST_REGS
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61 | 1057eaa7 | pbrook | #undef DO_REG |