/* * x86 exception helpers * * Copyright (c) 2003 Fabrice Bellard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ #include "cpu.h" #include "qemu/log.h" #include "sysemu/sysemu.h" #include "helper.h" #if 0 #define raise_exception_err(env, a, b) \ do { \ qemu_log("raise_exception line=%d\n", __LINE__); \ (raise_exception_err)(env, a, b); \ } while (0) #endif void helper_raise_interrupt(CPUX86State *env, int intno, int next_eip_addend) { raise_interrupt(env, intno, 1, 0, next_eip_addend); } void helper_raise_exception(CPUX86State *env, int exception_index) { raise_exception(env, exception_index); } /* * Check nested exceptions and change to double or triple fault if * needed. It should only be called, if this is not an interrupt. * Returns the new exception number. */ static int check_exception(CPUX86State *env, int intno, int *error_code) { int first_contributory = env->old_exception == 0 || (env->old_exception >= 10 && env->old_exception <= 13); int second_contributory = intno == 0 || (intno >= 10 && intno <= 13); qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n", env->old_exception, intno); #if !defined(CONFIG_USER_ONLY) if (env->old_exception == EXCP08_DBLE) { if (env->hflags & HF_SVMI_MASK) { cpu_vmexit(env, SVM_EXIT_SHUTDOWN, 0); /* does not return */ } qemu_log_mask(CPU_LOG_RESET, "Triple fault\n"); qemu_system_reset_request(); return EXCP_HLT; } #endif if ((first_contributory && second_contributory) || (env->old_exception == EXCP0E_PAGE && (second_contributory || (intno == EXCP0E_PAGE)))) { intno = EXCP08_DBLE; *error_code = 0; } if (second_contributory || (intno == EXCP0E_PAGE) || (intno == EXCP08_DBLE)) { env->old_exception = intno; } return intno; } /* * Signal an interruption. It is executed in the main CPU loop. * is_int is TRUE if coming from the int instruction. next_eip is the * env->eip value AFTER the interrupt instruction. It is only relevant if * is_int is TRUE. */ static void QEMU_NORETURN raise_interrupt2(CPUX86State *env, int intno, int is_int, int error_code, int next_eip_addend) { if (!is_int) { cpu_svm_check_intercept_param(env, SVM_EXIT_EXCP_BASE + intno, error_code); intno = check_exception(env, intno, &error_code); } else { cpu_svm_check_intercept_param(env, SVM_EXIT_SWINT, 0); } env->exception_index = intno; env->error_code = error_code; env->exception_is_int = is_int; env->exception_next_eip = env->eip + next_eip_addend; cpu_loop_exit(env); } /* shortcuts to generate exceptions */ void QEMU_NORETURN raise_interrupt(CPUX86State *env, int intno, int is_int, int error_code, int next_eip_addend) { raise_interrupt2(env, intno, is_int, error_code, next_eip_addend); } void raise_exception_err(CPUX86State *env, int exception_index, int error_code) { raise_interrupt2(env, exception_index, 0, error_code, 0); } void raise_exception(CPUX86State *env, int exception_index) { raise_interrupt2(env, exception_index, 0, 0, 0); }