LXR linux/arch/cris/kernel/ptrace.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/arch/cris/kernel/ptrace.c
   4 *
   5 * Parts taken from the m68k port.
   6 *
   7 * Copyright (c) 2000, 2001, 2002 Axis Communications AB
   8 *
   9 * Authors:   Bjorn Wesen
  10 *
  11 */
  12
  13#include <linux/kernel.h>
  14#include <linux/sched.h>
  15#include <linux/mm.h>
  16#include <linux/smp.h>
  17#include <linux/errno.h>
  18#include <linux/ptrace.h>
  19#include <linux/user.h>
  20#include <linux/tracehook.h>
  21
  22#include <linux/uaccess.h>
  23#include <asm/page.h>
  24#include <asm/pgtable.h>
  25#include <asm/processor.h>
  26
  27
  28/* notification of userspace execution resumption
  29 * - triggered by current->work.notify_resume
  30 */
  31extern int do_signal(int canrestart, struct pt_regs *regs);
  32
  33
  34void do_notify_resume(int canrestart, struct pt_regs *regs,
  35                      __u32 thread_info_flags)
  36{
  37        /* deal with pending signal delivery */
  38        if (thread_info_flags & _TIF_SIGPENDING)
  39                do_signal(canrestart,regs);
  40
  41        if (thread_info_flags & _TIF_NOTIFY_RESUME) {
  42                clear_thread_flag(TIF_NOTIFY_RESUME);
  43                tracehook_notify_resume(regs);
  44        }
  45}
  46
  47void do_work_pending(int syscall, struct pt_regs *regs,
  48                     unsigned int thread_flags)
  49{
  50        do {
  51                if (likely(thread_flags & _TIF_NEED_RESCHED)) {
  52                        schedule();
  53                } else {
  54                        if (unlikely(!user_mode(regs)))
  55                                return;
  56                        local_irq_enable();
  57                        if (thread_flags & _TIF_SIGPENDING) {
  58                                do_signal(syscall, regs);
  59                                syscall = 0;
  60                        } else {
  61                                clear_thread_flag(TIF_NOTIFY_RESUME);
  62                                tracehook_notify_resume(regs);
  63                        }
  64                }
  65                local_irq_disable();
  66                thread_flags = current_thread_info()->flags;
  67        } while (thread_flags & _TIF_WORK_MASK);
  68}
  69