Blue Swirl | 599b9a5 | 2012-04-28 19:53:52 +0000 | [diff] [blame] | 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" |
Blue Swirl | 9dd69d6 | 2012-04-29 09:07:22 +0000 | [diff] [blame] | 22 | #include "sysemu.h" |
Blue Swirl | 599b9a5 | 2012-04-28 19:53:52 +0000 | [diff] [blame] | 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 | |
Blue Swirl | 599b9a5 | 2012-04-28 19:53:52 +0000 | [diff] [blame] | 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 | } |