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Generate double and triple faults, by Bernhard Kauer. 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2563 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-03-31 20:28:52 +00:00
parent a80274c31b
commit 678dde1323
3 changed files with 42 additions and 0 deletions
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2
cpu-exec.c
View File

@ -360,6 +360,8 @@ int cpu_exec(CPUState *env1)
env->exception_is_int,
env->error_code,
env->exception_next_eip, 0);
/* successfully delivered */
env->old_exception = -1;
#elif defined(TARGET_PPC)
do_interrupt(env);
#elif defined(TARGET_MIPS)

1
target-i386/cpu.h
View File

@ -515,6 +515,7 @@ typedef struct CPUX86State {
uint32_t smbase;
int interrupt_request;
int user_mode_only; /* user mode only simulation */
int old_exception; /* exception in flight */
CPU_COMMON

39
target-i386/helper.c
View File

@ -1192,6 +1192,40 @@ void do_interrupt(int intno, int is_int, int error_code,
}
}
/*
* 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.
*/
int check_exception(int intno, int *error_code)
{
char first_contributory = env->old_exception == 0 ||
(env->old_exception >= 10 &&
env->old_exception <= 13);
char second_contributory = intno == 0 ||
(intno >= 10 && intno <= 13);
if (loglevel & CPU_LOG_INT)
fprintf(logfile, "check_exception old: %x new %x\n",
env->old_exception, intno);
if (env->old_exception == EXCP08_DBLE)
cpu_abort(env, "triple fault");
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
@ -1201,6 +1235,9 @@ void do_interrupt(int intno, int is_int, int error_code,
void raise_interrupt(int intno, int is_int, int error_code,
int next_eip_addend)
{
if (!is_int)
intno = check_exception(intno, &error_code);
env->exception_index = intno;
env->error_code = error_code;
env->exception_is_int = is_int;
@ -1211,6 +1248,8 @@ void raise_interrupt(int intno, int is_int, int error_code,
/* same as raise_exception_err, but do not restore global registers */
static void raise_exception_err_norestore(int exception_index, int error_code)
{
exception_index = check_exception(exception_index, &error_code);
env->exception_index = exception_index;
env->error_code = error_code;
env->exception_is_int = 0;