The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* |
David 'Digit' Turner | 2910f18 | 2010-05-10 18:48:35 -0700 | [diff] [blame] | 2 | * Save/restore host registers. |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 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 |
David 'Digit' Turner | 2910f18 | 2010-05-10 18:48:35 -0700 | [diff] [blame] | 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 18 | */ |
| 19 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 20 | /* The GCC global register variable extension is used to reserve some |
| 21 | host registers for use by generated code. However only the core parts of |
| 22 | the translation engine are compiled with these settings. We must manually |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 23 | save/restore these registers when called from regular code. |
| 24 | It is not sufficient to save/restore T0 et. al. as these may be declared |
| 25 | with a datatype smaller than the actual register. */ |
| 26 | |
| 27 | #if defined(DECLARE_HOST_REGS) |
| 28 | |
| 29 | #define DO_REG(REG) \ |
| 30 | register host_reg_t reg_AREG##REG asm(AREG##REG); \ |
| 31 | volatile host_reg_t saved_AREG##REG; |
| 32 | |
| 33 | #elif defined(SAVE_HOST_REGS) |
| 34 | |
| 35 | #define DO_REG(REG) \ |
| 36 | __asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \ |
| 37 | saved_AREG##REG = reg_AREG##REG; |
| 38 | |
| 39 | #else |
| 40 | |
| 41 | #define DO_REG(REG) \ |
| 42 | reg_AREG##REG = saved_AREG##REG; \ |
| 43 | __asm__ __volatile__ ("" : : "r" (reg_AREG##REG)); |
| 44 | |
| 45 | #endif |
| 46 | |
| 47 | #ifdef AREG0 |
| 48 | DO_REG(0) |
| 49 | #endif |
| 50 | |
| 51 | #ifdef AREG1 |
| 52 | DO_REG(1) |
| 53 | #endif |
| 54 | |
| 55 | #ifdef AREG2 |
| 56 | DO_REG(2) |
| 57 | #endif |
| 58 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 59 | #undef SAVE_HOST_REGS |
| 60 | #undef DECLARE_HOST_REGS |
| 61 | #undef DO_REG |