LXR linux/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 <asm/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 */
  30extern int do_signal(int canrestart, struct pt_regs *regs);
  31
  32
  33void 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
  46void 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}
  68