aboutsummaryrefslogtreecommitdiff
path: root/target/i386/excp_helper.c
diff options
context:
space:
mode:
Diffstat (limited to 'target/i386/excp_helper.c')
-rw-r--r--target/i386/excp_helper.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/target/i386/excp_helper.c b/target/i386/excp_helper.c
new file mode 100644
index 0000000000..f0dc4996c1
--- /dev/null
+++ b/target/i386/excp_helper.c
@@ -0,0 +1,137 @@
+/*
+ * 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 "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/exec-all.h"
+#include "qemu/log.h"
+#include "sysemu/sysemu.h"
+#include "exec/helper-proto.h"
+
+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,
+ uintptr_t retaddr)
+{
+ CPUState *cs = CPU(x86_env_get_cpu(env));
+
+ 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);
+ }
+
+ cs->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_restore(cs, retaddr);
+}
+
+/* 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, 0);
+}
+
+void raise_exception_err(CPUX86State *env, int exception_index,
+ int error_code)
+{
+ raise_interrupt2(env, exception_index, 0, error_code, 0, 0);
+}
+
+void raise_exception_err_ra(CPUX86State *env, int exception_index,
+ int error_code, uintptr_t retaddr)
+{
+ raise_interrupt2(env, exception_index, 0, error_code, 0, retaddr);
+}
+
+void raise_exception(CPUX86State *env, int exception_index)
+{
+ raise_interrupt2(env, exception_index, 0, 0, 0, 0);
+}
+
+void raise_exception_ra(CPUX86State *env, int exception_index, uintptr_t retaddr)
+{
+ raise_interrupt2(env, exception_index, 0, 0, 0, retaddr);
+}