projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1057eaa7 PB |
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 | |
| fad6cb1a | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA |
| 1057eaa7 PB |
19 | */ |
| 20 | ||
| 54604f74 AJ |
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 | |
| 1057eaa7 PB |
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 |