SYS-OSS/FRET-qemu
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fuzz multiple interrupts

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This commit is contained in:
Alwin Berger 2023-03-02 15:32:24 +01:00
parent 2f09bc50b6
commit 21249ee504
1 changed files with 16 additions and 11 deletions
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27
hw/timer/armv7m_systick.c
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@ -310,9 +310,11 @@ static void armv7m_systick_register_types(void)
type_init(armv7m_systick_register_types)
/* Begin LibAFL instrumentation */
#define MAX_NUM_INTERRUPT 32
extern void libafl_send_irq(int irqn);
volatile unsigned int libafl_int_offset = 0;
static ptimer_state* mytimer;
volatile uint32_t libafl_interrupt_offsets[MAX_NUM_INTERRUPT];
volatile uint64_t libafl_num_interrupts;
static ptimer_state* libafl_interrupt_timers[MAX_NUM_INTERRUPT] = {0};
/* This can be moved to a helper function later */
static void libafl_timed_int_hook(void*);
static void libafl_timed_int_hook(void* arg)
@ -321,15 +323,18 @@ static void libafl_timed_int_hook(void* arg)
}
void libafl_start_int_timer( void );
void libafl_start_int_timer( void ) {
if (libafl_int_offset==0) {return;}
if (!mytimer) {
mytimer = ptimer_init(&libafl_timed_int_hook, NULL, 0);
if (libafl_num_interrupts == 0) {return;}
for (int i=0; i<libafl_num_interrupts && i<MAX_NUM_INTERRUPT; i++) {
if (libafl_interrupt_offsets[i] == 0) {continue;}
if (!libafl_interrupt_timers[i]) {
libafl_interrupt_timers[i] = ptimer_init(&libafl_timed_int_hook, NULL, 0);
}
ptimer_transaction_begin(libafl_interrupt_timers[i]);
ptimer_stop(libafl_interrupt_timers[i]);
ptimer_set_period(libafl_interrupt_timers[i], libafl_interrupt_offsets[i]);
ptimer_set_count(libafl_interrupt_timers[i], 16); // needs to be in sync with shift
ptimer_run(libafl_interrupt_timers[i], 1);
ptimer_transaction_commit(libafl_interrupt_timers[i]);
}
ptimer_transaction_begin(mytimer);
ptimer_stop(mytimer);
ptimer_set_period(mytimer, libafl_int_offset);
ptimer_set_count(mytimer, 8);
ptimer_run(mytimer, 1);
ptimer_transaction_commit(mytimer);
}
/* End LibAFL instrumentation */