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  * $Log: ptrace.c,v $
  11  * Revision 1.9  2003/07/04 12:56:11  tobiasa
  12  * Moved arch-specific code to arch-specific files.
  13  *
  14  * Revision 1.8  2003/04/09 05:20:47  starvik
  15  * Merge of Linux 2.5.67
  16  *
  17  * Revision 1.7  2002/11/27 08:42:34  starvik
  18  * Argument to user_regs() is thread_info*
  19  *
  20  * Revision 1.6  2002/11/20 11:56:11  starvik
  21  * Merge of Linux 2.5.48
  22  *
  23  * Revision 1.5  2002/11/18 07:41:19  starvik
  24  * Removed warning
  25  *
  26  * Revision 1.4  2002/11/11 12:47:28  starvik
  27  * SYSCALL_TRACE has been moved to thread flags
  28  *
  29  * Revision 1.3  2002/02/05 15:37:18  bjornw
  30  * * Add do_notify_resume (replaces do_signal in the callchain)
  31  * * syscall_trace is now do_syscall_trace
  32  * * current->ptrace flag PT_TRACESYS -> PT_SYSCALLTRACE
  33  * * Keep track of the current->work.syscall_trace counter
  34  *
  35  * Revision 1.2  2001/12/18 13:35:20  bjornw
  36  * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
  37  *
  38  * Revision 1.8  2001/11/12 18:26:21  pkj
  39  * Fixed compiler warnings.
  40  *
  41  * Revision 1.7  2001/09/26 11:53:49  bjornw
  42  * PTRACE_DETACH works more simple in 2.4.10
  43  *
  44  * Revision 1.6  2001/07/25 16:08:47  bjornw
  45  * PTRACE_ATTACH bulk moved into arch-independent code in 2.4.7
  46  *
  47  * Revision 1.5  2001/03/26 14:24:28  orjanf
  48  * * Changed loop condition.
  49  * * Added comment documenting non-standard ptrace behaviour.
  50  *
  51  * Revision 1.4  2001/03/20 19:44:41  bjornw
  52  * Use the user_regs macro instead of thread.esp0
  53  *
  54  * Revision 1.3  2000/12/18 23:45:25  bjornw
  55  * Linux/CRIS first version
  56  *
  57  *
  58  */
  59
  60 #include <linux/kernel.h>
  61 #include <linux/sched.h>
  62 #include <linux/mm.h>
  63 #include <linux/smp.h>
  64 #include <linux/smp_lock.h>
  65 #include <linux/errno.h>
  66 #include <linux/ptrace.h>
  67 #include <linux/user.h>
  68
  69 #include <asm/uaccess.h>
  70 #include <asm/page.h>
  71 #include <asm/pgtable.h>
  72 #include <asm/system.h>
  73 #include <asm/processor.h>
  74
  75 /*
  76  * Get contents of register REGNO in task TASK.
  77  */
  78 inline long get_reg(struct task_struct *task, unsigned int regno)
  79 {
  80         /* USP is a special case, it's not in the pt_regs struct but
  81          * in the tasks thread struct
  82          */
  83
  84         if (regno == PT_USP)
  85                 return task->thread.usp;
  86         else if (regno < PT_MAX)
  87                 return ((unsigned long *)user_regs(task->thread_info))[regno];
  88         else
  89                 return 0;
  90 }
  91
  92 /*
  93  * Write contents of register REGNO in task TASK.
  94  */
  95 inline int put_reg(struct task_struct *task, unsigned int regno,
  96                           unsigned long data)
  97 {
  98         if (regno == PT_USP)
  99                 task->thread.usp = data;
 100         else if (regno < PT_MAX)
 101                 ((unsigned long *)user_regs(task->thread_info))[regno] = data;
 102         else
 103                 return -1;
 104         return 0;
 105 }
 106
 107 /* notification of userspace execution resumption
 108  * - triggered by current->work.notify_resume
 109  */
 110 extern int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs);
 111
 112
 113 void do_notify_resume(int canrestart, sigset_t *oldset, struct pt_regs *regs,
 114                       __u32 thread_info_flags  )
 115 {
 116         /* deal with pending signal delivery */
 117         if (thread_info_flags & _TIF_SIGPENDING)
 118                 do_signal(canrestart,oldset,regs);
 119 }