Merge remote-tracking branch 'remotes/jsnow-gitlab/tags/python-pull-request' into...
[qemu.git] / target / i386 / tcg / bpt_helper.c
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 }