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
do_notify_resume(int canrestart,struct pt_regs * regs,__u32 thread_info_flags)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
do_work_pending(int syscall,struct pt_regs * regs,unsigned int thread_flags)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 }
69