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  */
  31 extern int do_signal(int canrestart, struct pt_regs *regs);
  32
  33
  34 void 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
  47 void 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 }