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Make heuristic stack scanning more accurate

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2007-11-18  Soren Sandmann <sandmann@daimi.au.dk>

        * module/sysprof-module.c (heuristic_trace): Make heuristic stack
        scanning more accurate



svn path=/trunk/; revision=393
This commit is contained in:
Soren Sandmann
2007-11-19 03:34:19 +00:00
committed by Søren Sandmann Pedersen
parent 05c4a202b3
commit 8d73f2d391
3 changed files with 50 additions and 5 deletions
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46
module/sysprof-module.c
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@ -177,24 +177,59 @@ heuristic_trace (struct pt_regs *regs,
if (esp < eos - (current->mm->stack_vm << PAGE_SHIFT)) {
/* Stack pointer is not in stack map */
printk (KERN_ALERT "too small stackpointer in %d\n", current->pid);
return;
}
if (eos > esp) {
if (esp < eos) {
#if 0
printk (KERN_ALERT "ok stackpointer\n");
#endif
unsigned long i;
int j;
int n_bytes = minimum (eos - esp, (SYSPROF_MAX_ADDRESSES - 1) * sizeof (void *));
j = 1;
for (i = esp; i < eos && j < SYSPROF_MAX_ADDRESSES; i += sizeof (void *)) {
unsigned long x;
struct vm_area_struct *vma;
if (__copy_from_user_inatomic (&x, (void *)i, sizeof (unsigned long)))
break;
vma = find_vma (current->mm, x);
if (vma && vma->vm_flags & VM_EXEC && vma->vm_start <= x && x <= vma->vm_end) {
trace->addresses[j++] = x;
}
}
#if 0
if (__copy_from_user_inatomic (&(trace->addresses[1]), esp, n_bytes) == 0)
trace->n_addresses = n_bytes / sizeof (void *);
else
trace->n_addresses = 1;
j = 1;
for (i = esp; i < eos && j < SYSPROF_MAX_ADDRESSES; i += sizeof (void *)) {
void *x;
if (__copy_from_user_inatomic (
&x, (char *)i, sizeof (x)) == 0)
trace->addresses[j++] = x;
&x, (char *)i, sizeof (x)) == 0) {
if ((unsigned long)x != 1)
trace->addresses[j++] = x;
}
}
#endif
trace->n_addresses = j;
return;
}
#if 0
printk (KERN_ALERT "too big stackpointer\n");
#endif
}
#ifdef OLD_PROFILE
@ -219,8 +254,9 @@ timer_notify (struct pt_regs *regs)
return 0;
/* 0: locked, 1: unlocked */
if (!atomic_dec_and_test(&in_timer_notify))
if (!atomic_dec_and_test(&in_timer_notify)) {
goto out;
}
is_user = user_mode(regs);