asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
{
- unsigned int correction = thumb_mode(regs) ? 2 : 4;
unsigned int instr;
siginfo_t info;
void __user *pc;
- /*
- * According to the ARM ARM, PC is 2 or 4 bytes ahead,
- * depending whether we're in Thumb mode or not.
- * Correct this offset.
- */
- regs->ARM_pc -= correction;
-
pc = (void __user *)instruction_pointer(regs);
if (processor_mode(regs) == SVC_MODE) {
#endif
instr = *(u32 *) pc;
} else if (thumb_mode(regs)) {
- get_user(instr, (u16 __user *)pc);
+ if (get_user(instr, (u16 __user *)pc))
+ goto die_sig;
if (is_wide_instruction(instr)) {
unsigned int instr2;
- get_user(instr2, (u16 __user *)pc+1);
+ if (get_user(instr2, (u16 __user *)pc+1))
+ goto die_sig;
instr <<= 16;
instr |= instr2;
}
- } else {
- get_user(instr, (u32 __user *)pc);
+ } else if (get_user(instr, (u32 __user *)pc)) {
+ goto die_sig;
}
if (call_undef_hook(regs, instr) == 0)
return;
+die_sig:
#ifdef CONFIG_DEBUG_USER
if (user_debug & UDBG_UNDEFINED) {
printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n",
if (end > vma->vm_end)
end = vma->vm_end;
- flush_cache_user_range(vma, start, end);
+ up_read(&mm->mmap_sem);
+ flush_cache_user_range(start, end);
+ return;
}
up_read(&mm->mmap_sem);
}