1 /* 2 * i386 breakpoint helpers 3 * 4 * Copyright (c) 2003 Fabrice Bellard 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 2.1 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 #include "qemu/osdep.h" 21 #include "cpu.h" 22 #include "exec/helper-proto.h" 23 #include "helper-tcg.h" 24 25 void QEMU_NORETURN helper_single_step(CPUX86State *env) 26 { 27 #ifndef CONFIG_USER_ONLY 28 check_hw_breakpoints(env, true); 29 env->dr[6] |= DR6_BS; 30 #endif 31 raise_exception(env, EXCP01_DB); 32 } 33 34 void helper_rechecking_single_step(CPUX86State *env) 35 { 36 if ((env->eflags & TF_MASK) != 0) { 37 helper_single_step(env); 38 } 39 } 40 41 target_ulong helper_get_dr(CPUX86State *env, int reg) 42 { 43 switch (reg) { 44 case 0: case 1: case 2: case 3: case 6: case 7: 45 return env->dr[reg]; 46 case 4: 47 if (env->cr[4] & CR4_DE_MASK) { 48 break; 49 } else { 50 return env->dr[6]; 51 } 52 case 5: 53 if (env->cr[4] & CR4_DE_MASK) { 54 break; 55 } else { 56 return env->dr[7]; 57 } 58 } 59 raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC()); 60 } 61