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start interrupt timer on start

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This commit is contained in:
Alwin Berger 2022-05-04 22:58:30 +02:00
parent a5a49c3292
commit 3493dfa219
2 changed files with 31 additions and 23 deletions
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48
hw/timer/armv7m_systick.c
View File

@ -38,31 +38,8 @@ static inline int64_t systick_scale(SysTickState *s)
return 1000;
}
}
/* Begin LibAFL instrumentation */
extern void libafl_send_irq(int irqn);
extern int64_t libafl_get_clock( void );
volatile unsigned int libafl_int_offset = 0;
volatile bool libafl_int_done = false;
/* This can be moved to a helper function later */
inline void libafl_exec_systick_hook(void);
inline void libafl_exec_systick_hook(void)
{
if (libafl_int_offset!=0 && libafl_int_offset) {
if (libafl_get_clock() >= libafl_int_offset) {
if (!libafl_int_done) {
libafl_int_done = true;
libafl_send_irq(0);
}
} else {
libafl_int_done = false;
}
}
}
static void systick_timer_tick(void *opaque)
{
libafl_exec_systick_hook();
/* End LibAFL instrumentation */
SysTickState *s = (SysTickState *)opaque;
trace_systick_timer_tick();
@ -270,3 +247,28 @@ static void armv7m_systick_register_types(void)
}
type_init(armv7m_systick_register_types)
/* Begin LibAFL instrumentation */
extern void libafl_send_irq(int irqn);
volatile unsigned int libafl_int_offset = 0;
static ptimer_state* mytimer;
/* This can be moved to a helper function later */
static void libafl_timed_int_hook(void*);
static void libafl_timed_int_hook(void* arg)
{
libafl_send_irq(0);
}
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);
}
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 */

6
softmmu/main.c
View File

@ -66,8 +66,14 @@ void libafl_phys_read(vaddr, uint8_t*, int);
void libafl_phys_write(vaddr, uint8_t*, int);
int64_t libafl_get_clock( void );
#ifdef TARGET_ARM
extern void libafl_start_int_timer(void);
#endif
void libafl_qemu_main_loop( void )
{
#ifdef TARGET_ARM
libafl_start_int_timer();
#endif
vm_start();
qemu_main_loop();
}