arch/cris/kernel/ptrace.c

   1 /*
   2  *  linux/arch/cris/kernel/ptrace.c
   3  *
   4  * Parts taken from the m68k port.
   5  *
   6  * Copyright (c) 2000, 2001, 2002 Axis Communications AB
   7  *
   8  * Authors:   Bjorn Wesen
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/smp.h>
  16 #include <linux/errno.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/tracehook.h>
  20
  21 #include <linux/uaccess.h>
  22 #include <asm/page.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/processor.h>
  25
  26
  27 /* notification of userspace execution resumption
  28  * - triggered by current->work.notify_resume
  29  */
  30 extern int do_signal(int canrestart, struct pt_regs *regs);
  31
  32
  33 void do_notify_resume(int canrestart, struct pt_regs *regs,
  34                       __u32 thread_info_flags)
  35 {
  36         /* deal with pending signal delivery */
  37         if (thread_info_flags & _TIF_SIGPENDING)
  38                 do_signal(canrestart,regs);
  39
  40         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
  41                 clear_thread_flag(TIF_NOTIFY_RESUME);
  42                 tracehook_notify_resume(regs);
  43         }
  44 }
  45
  46 void do_work_pending(int syscall, struct pt_regs *regs,
  47                      unsigned int thread_flags)
  48 {
  49         do {
  50                 if (likely(thread_flags & _TIF_NEED_RESCHED)) {
  51                         schedule();
  52                 } else {
  53                         if (unlikely(!user_mode(regs)))
  54                                 return;
  55                         local_irq_enable();
  56                         if (thread_flags & _TIF_SIGPENDING) {
  57                                 do_signal(syscall, regs);
  58                                 syscall = 0;
  59                         } else {
  60                                 clear_thread_flag(TIF_NOTIFY_RESUME);
  61                                 tracehook_notify_resume(regs);
  62                         }
  63                 }
  64                 local_irq_disable();
  65                 thread_flags = current_thread_info()->flags;
  66         } while (thread_flags & _TIF_WORK_MASK);
  67 }