nbd: add missed aio_context_acquire in nbd_export_new
[qemu/ar7.git] / target-i386 / excp_helper.c
blob5e347bc46c39782f4f5295a40eb82e085934b1fd
1 /*
2 * x86 exception helpers
4 * Copyright (c) 2003 Fabrice Bellard
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.
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.
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/>.
20 #include "cpu.h"
21 #include "qemu/log.h"
22 #include "sysemu/sysemu.h"
23 #include "exec/helper-proto.h"
25 void helper_raise_interrupt(CPUX86State *env, int intno, int next_eip_addend)
27 raise_interrupt(env, intno, 1, 0, next_eip_addend);
30 void helper_raise_exception(CPUX86State *env, int exception_index)
32 raise_exception(env, exception_index);
36 * Check nested exceptions and change to double or triple fault if
37 * needed. It should only be called, if this is not an interrupt.
38 * Returns the new exception number.
40 static int check_exception(CPUX86State *env, int intno, int *error_code)
42 int first_contributory = env->old_exception == 0 ||
43 (env->old_exception >= 10 &&
44 env->old_exception <= 13);
45 int second_contributory = intno == 0 ||
46 (intno >= 10 && intno <= 13);
48 qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n",
49 env->old_exception, intno);
51 #if !defined(CONFIG_USER_ONLY)
52 if (env->old_exception == EXCP08_DBLE) {
53 if (env->hflags & HF_SVMI_MASK) {
54 cpu_vmexit(env, SVM_EXIT_SHUTDOWN, 0); /* does not return */
57 qemu_log_mask(CPU_LOG_RESET, "Triple fault\n");
59 qemu_system_reset_request();
60 return EXCP_HLT;
62 #endif
64 if ((first_contributory && second_contributory)
65 || (env->old_exception == EXCP0E_PAGE &&
66 (second_contributory || (intno == EXCP0E_PAGE)))) {
67 intno = EXCP08_DBLE;
68 *error_code = 0;
71 if (second_contributory || (intno == EXCP0E_PAGE) ||
72 (intno == EXCP08_DBLE)) {
73 env->old_exception = intno;
76 return intno;
80 * Signal an interruption. It is executed in the main CPU loop.
81 * is_int is TRUE if coming from the int instruction. next_eip is the
82 * env->eip value AFTER the interrupt instruction. It is only relevant if
83 * is_int is TRUE.
85 static void QEMU_NORETURN raise_interrupt2(CPUX86State *env, int intno,
86 int is_int, int error_code,
87 int next_eip_addend,
88 uintptr_t retaddr)
90 CPUState *cs = CPU(x86_env_get_cpu(env));
92 if (!is_int) {
93 cpu_svm_check_intercept_param(env, SVM_EXIT_EXCP_BASE + intno,
94 error_code);
95 intno = check_exception(env, intno, &error_code);
96 } else {
97 cpu_svm_check_intercept_param(env, SVM_EXIT_SWINT, 0);
100 cs->exception_index = intno;
101 env->error_code = error_code;
102 env->exception_is_int = is_int;
103 env->exception_next_eip = env->eip + next_eip_addend;
104 cpu_loop_exit_restore(cs, retaddr);
107 /* shortcuts to generate exceptions */
109 void QEMU_NORETURN raise_interrupt(CPUX86State *env, int intno, int is_int,
110 int error_code, int next_eip_addend)
112 raise_interrupt2(env, intno, is_int, error_code, next_eip_addend, 0);
115 void raise_exception_err(CPUX86State *env, int exception_index,
116 int error_code)
118 raise_interrupt2(env, exception_index, 0, error_code, 0, 0);
121 void raise_exception_err_ra(CPUX86State *env, int exception_index,
122 int error_code, uintptr_t retaddr)
124 raise_interrupt2(env, exception_index, 0, error_code, 0, retaddr);
127 void raise_exception(CPUX86State *env, int exception_index)
129 raise_interrupt2(env, exception_index, 0, 0, 0, 0);
132 void raise_exception_ra(CPUX86State *env, int exception_index, uintptr_t retaddr)
134 raise_interrupt2(env, exception_index, 0, 0, 0, retaddr);