Merge remote-tracking branch 'remotes/jsnow-gitlab/tags/python-pull-request' into...
[qemu.git] / target / i386 / tcg / excp_helper.c
1 /*
2 * x86 exception 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/exec-all.h"
23 #include "qemu/log.h"
24 #include "sysemu/runstate.h"
25 #include "exec/helper-proto.h"
26 #include "helper-tcg.h"
27
28 void QEMU_NORETURN helper_raise_interrupt(CPUX86State *env, int intno,
29 int next_eip_addend)
30 {
31 raise_interrupt(env, intno, 1, 0, next_eip_addend);
32 }
33
34 void QEMU_NORETURN helper_raise_exception(CPUX86State *env, int exception_index)
35 {
36 raise_exception(env, exception_index);
37 }
38
39 /*
40 * Check nested exceptions and change to double or triple fault if
41 * needed. It should only be called, if this is not an interrupt.
42 * Returns the new exception number.
43 */
44 static int check_exception(CPUX86State *env, int intno, int *error_code,
45 uintptr_t retaddr)
46 {
47 int first_contributory = env->old_exception == 0 ||
48 (env->old_exception >= 10 &&
49 env->old_exception <= 13);
50 int second_contributory = intno == 0 ||
51 (intno >= 10 && intno <= 13);
52
53 qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n",
54 env->old_exception, intno);
55
56 #if !defined(CONFIG_USER_ONLY)
57 if (env->old_exception == EXCP08_DBLE) {
58 if (env->hflags & HF_GUEST_MASK) {
59 cpu_vmexit(env, SVM_EXIT_SHUTDOWN, 0, retaddr); /* does not return */
60 }
61
62 qemu_log_mask(CPU_LOG_RESET, "Triple fault\n");
63
64 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
65 return EXCP_HLT;
66 }
67 #endif
68
69 if ((first_contributory && second_contributory)
70 || (env->old_exception == EXCP0E_PAGE &&
71 (second_contributory || (intno == EXCP0E_PAGE)))) {
72 intno = EXCP08_DBLE;
73 *error_code = 0;
74 }
75
76 if (second_contributory || (intno == EXCP0E_PAGE) ||
77 (intno == EXCP08_DBLE)) {
78 env->old_exception = intno;
79 }
80
81 return intno;
82 }
83
84 /*
85 * Signal an interruption. It is executed in the main CPU loop.
86 * is_int is TRUE if coming from the int instruction. next_eip is the
87 * env->eip value AFTER the interrupt instruction. It is only relevant if
88 * is_int is TRUE.
89 */
90 static void QEMU_NORETURN raise_interrupt2(CPUX86State *env, int intno,
91 int is_int, int error_code,
92 int next_eip_addend,
93 uintptr_t retaddr)
94 {
95 CPUState *cs = env_cpu(env);
96
97 if (!is_int) {
98 cpu_svm_check_intercept_param(env, SVM_EXIT_EXCP_BASE + intno,
99 error_code, retaddr);
100 intno = check_exception(env, intno, &error_code, retaddr);
101 } else {
102 cpu_svm_check_intercept_param(env, SVM_EXIT_SWINT, 0, retaddr);
103 }
104
105 cs->exception_index = intno;
106 env->error_code = error_code;
107 env->exception_is_int = is_int;
108 env->exception_next_eip = env->eip + next_eip_addend;
109 cpu_loop_exit_restore(cs, retaddr);
110 }
111
112 /* shortcuts to generate exceptions */
113
114 void QEMU_NORETURN raise_interrupt(CPUX86State *env, int intno, int is_int,
115 int error_code, int next_eip_addend)
116 {
117 raise_interrupt2(env, intno, is_int, error_code, next_eip_addend, 0);
118 }
119
120 void QEMU_NORETURN raise_exception_err(CPUX86State *env, int exception_index,
121 int error_code)
122 {
123 raise_interrupt2(env, exception_index, 0, error_code, 0, 0);
124 }
125
126 void QEMU_NORETURN raise_exception_err_ra(CPUX86State *env, int exception_index,
127 int error_code, uintptr_t retaddr)
128 {
129 raise_interrupt2(env, exception_index, 0, error_code, 0, retaddr);
130 }
131
132 void QEMU_NORETURN raise_exception(CPUX86State *env, int exception_index)
133 {
134 raise_interrupt2(env, exception_index, 0, 0, 0, 0);
135 }
136
137 void QEMU_NORETURN raise_exception_ra(CPUX86State *env, int exception_index,
138 uintptr_t retaddr)
139 {
140 raise_interrupt2(env, exception_index, 0, 0, 0, retaddr);
141 }