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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 }