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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 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 "cpu.h"
21 #include "qemu/log.h"
22 #include "sysemu/sysemu.h"
23 #include "helper.h"
24
25 #if 0
26 #define raise_exception_err(env, a, b) \
27 do { \
28 qemu_log("raise_exception line=%d\n", __LINE__); \
29 (raise_exception_err)(env, a, b); \
30 } while (0)
31 #endif
32
33 void helper_raise_interrupt(CPUX86State *env, int intno, int next_eip_addend)
34 {
35 raise_interrupt(env, intno, 1, 0, next_eip_addend);
36 }
37
38 void helper_raise_exception(CPUX86State *env, int exception_index)
39 {
40 raise_exception(env, exception_index);
41 }
42
43 /*
44 * Check nested exceptions and change to double or triple fault if
45 * needed. It should only be called, if this is not an interrupt.
46 * Returns the new exception number.
47 */
48 static int check_exception(CPUX86State *env, int intno, int *error_code)
49 {
50 int first_contributory = env->old_exception == 0 ||
51 (env->old_exception >= 10 &&
52 env->old_exception <= 13);
53 int second_contributory = intno == 0 ||
54 (intno >= 10 && intno <= 13);
55
56 qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n",
57 env->old_exception, intno);
58
59 #if !defined(CONFIG_USER_ONLY)
60 if (env->old_exception == EXCP08_DBLE) {
61 if (env->hflags & HF_SVMI_MASK) {
62 cpu_vmexit(env, SVM_EXIT_SHUTDOWN, 0); /* does not return */
63 }
64
65 qemu_log_mask(CPU_LOG_RESET, "Triple fault\n");
66
67 qemu_system_reset_request();
68 return EXCP_HLT;
69 }
70 #endif
71
72 if ((first_contributory && second_contributory)
73 || (env->old_exception == EXCP0E_PAGE &&
74 (second_contributory || (intno == EXCP0E_PAGE)))) {
75 intno = EXCP08_DBLE;
76 *error_code = 0;
77 }
78
79 if (second_contributory || (intno == EXCP0E_PAGE) ||
80 (intno == EXCP08_DBLE)) {
81 env->old_exception = intno;
82 }
83
84 return intno;
85 }
86
87 /*
88 * Signal an interruption. It is executed in the main CPU loop.
89 * is_int is TRUE if coming from the int instruction. next_eip is the
90 * EIP value AFTER the interrupt instruction. It is only relevant if
91 * is_int is TRUE.
92 */
93 static void QEMU_NORETURN raise_interrupt2(CPUX86State *env, int intno,
94 int is_int, int error_code,
95 int next_eip_addend)
96 {
97 if (!is_int) {
98 cpu_svm_check_intercept_param(env, SVM_EXIT_EXCP_BASE + intno,
99 error_code);
100 intno = check_exception(env, intno, &error_code);
101 } else {
102 cpu_svm_check_intercept_param(env, SVM_EXIT_SWINT, 0);
103 }
104
105 env->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(env);
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);
118 }
119
120 void raise_exception_err(CPUX86State *env, int exception_index,
121 int error_code)
122 {
123 raise_interrupt2(env, exception_index, 0, error_code, 0);
124 }
125
126 void raise_exception(CPUX86State *env, int exception_index)
127 {
128 raise_interrupt2(env, exception_index, 0, 0, 0);
129 }