| 1 | /*
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| 2 | * Save/restore host registrs.
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| 3 | *
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| 4 | * Copyright (c) 2007 CodeSourcery
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | /*
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| 21 | * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
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| 22 | * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
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| 23 | * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
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| 24 | * a choice of LGPL license versions is made available with the language indicating
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| 25 | * that LGPLv2 or any later version may be used, or where a choice of which version
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| 26 | * of the LGPL is applied is otherwise unspecified.
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| 27 | */
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| 28 |
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| 29 | /* The GCC global register variable extension is used to reserve some
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| 30 | host registers for use by generated code. However only the core parts of
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| 31 | the translation engine are compiled with these settings. We must manually
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| 32 | save/restore these registers when called from regular code.
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| 33 | It is not sufficient to save/restore T0 et. al. as these may be declared
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| 34 | with a datatype smaller than the actual register. */
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| 35 |
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| 36 | #if defined(DECLARE_HOST_REGS)
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| 37 |
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| 38 | #define DO_REG(REG) \
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| 39 | register host_reg_t reg_AREG##REG asm(AREG##REG); \
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| 40 | volatile host_reg_t saved_AREG##REG;
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| 41 |
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| 42 | #elif defined(SAVE_HOST_REGS)
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| 43 |
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| 44 | #define DO_REG(REG) \
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| 45 | __asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \
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| 46 | saved_AREG##REG = reg_AREG##REG;
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| 47 |
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| 48 | #else
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| 49 |
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| 50 | #define DO_REG(REG) \
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| 51 | reg_AREG##REG = saved_AREG##REG; \
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| 52 | __asm__ __volatile__ ("" : : "r" (reg_AREG##REG));
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| 53 |
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| 54 | #endif
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| 55 |
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| 56 | #ifdef AREG0
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| 57 | DO_REG(0)
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| 58 | #endif
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| 59 |
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| 60 | #ifdef AREG1
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| 61 | DO_REG(1)
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| 62 | #endif
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| 63 |
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| 64 | #ifdef AREG2
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| 65 | DO_REG(2)
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| 66 | #endif
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| 67 |
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| 68 | #undef SAVE_HOST_REGS
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| 69 | #undef DECLARE_HOST_REGS
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| 70 | #undef DO_REG
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