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x86: Issue reset on triple faults (Jan Kiszka) 

As discussed a few times on this list: A triple fault causes a system
reset on x86, and some guests make use of this (e.g. 386BSD). To keep
the chance of tracing unexpected resets, log them if CPU_LOG_RESET is
set.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6453 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-26 19:54:36 +00:00
parent eca1bdf415
commit f55761a0c4
1 changed files with 15 additions and 2 deletions
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17
target-i386/op_helper.c
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@ -1251,6 +1251,9 @@ void do_interrupt(int intno, int is_int, int error_code,
}
}
/* This should come from sysemu.h - if we could include it here... */
void qemu_system_reset_request(void);
/*
* Check nested exceptions and change to double or triple fault if
* needed. It should only be called, if this is not an interrupt.
@ -1267,8 +1270,18 @@ static int check_exception(int intno, int *error_code)
qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n",
env->old_exception, intno);
if (env->old_exception == EXCP08_DBLE)
cpu_abort(env, "triple fault");
#if !defined(CONFIG_USER_ONLY)
if (env->old_exception == EXCP08_DBLE) {
if (env->hflags & HF_SVMI_MASK)
helper_vmexit(SVM_EXIT_SHUTDOWN, 0); /* does not return */
if (loglevel & CPU_LOG_RESET)
fprintf(logfile, "Triple fault\n");
qemu_system_reset_request();
return EXCP_HLT;
}
#endif
if ((first_contributory && second_contributory)
|| (env->old_exception == EXCP0E_PAGE &&