1 /* 2 * Save/restore host registers. 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, see <http://www.gnu.org/licenses/>. 18 */ 19 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 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 59 #undef SAVE_HOST_REGS 60 #undef DECLARE_HOST_REGS 61 #undef DO_REG 62
