m32r: convert to generic sys_ptrace

Convert m32r to the generic sys_ptrace.  The conversion requires an
architecture hook after ptrace_attach which this patch adds.  The hook
will also be needed for a conersion of ia64 to the generic ptrace code.

Thanks to Hirokazu Takata for fixing a bug in the first version of this
code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 39 deletions

diff --git a/arch/m32r/kernel/ptrace.c b/arch/m32r/kernel/ptrace.c
index abbeaf8f6d0..ed4d0756c5d 100644
--- a/arch/m32r/kernel/ptrace.c
+++ b/arch/m32r/kernel/ptrace.c
@@ -570,7 +570,7 @@ withdraw_debug_trap(struct pt_regs *regs)
         }
 }
 
-static void
+void
 init_debug_traps(struct task_struct *child)
 {
         struct debug_trap *p = &child->thread.debug_trap;
@@ -593,8 +593,8 @@ void ptrace_disable(struct task_struct *child)
         /* nothing to do.. */
 }
 
-static int
-do_ptrace(long request, struct task_struct *child, long addr, long data)
+long
+arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
         int ret;
 
@@ -720,42 +720,6 @@ do_ptrace(long request, struct task_struct *child, long addr, long data)
         return ret;
 }
 
-asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
-{
-        struct task_struct *child;
-        int ret;
-
-        lock_kernel();
-        if (request == PTRACE_TRACEME) {
-                ret = ptrace_traceme();
-                goto out;
-        }
-
-        child = ptrace_get_task_struct(pid);
-        if (IS_ERR(child)) {
-                ret = PTR_ERR(child);
-                goto out;
-        }
-
-        if (request == PTRACE_ATTACH) {
-                ret = ptrace_attach(child);
-                if (ret == 0)
-                        init_debug_traps(child);
-                goto out_tsk;
-        }
-
-        ret = ptrace_check_attach(child, request == PTRACE_KILL);
-        if (ret == 0)
-                ret = do_ptrace(request, child, addr, data);
-
-out_tsk:
-        put_task_struct(child);
-out:
-        unlock_kernel();
-
-        return ret;
-}
-
 /* notification of system call entry/exit
  * - triggered by current->work.syscall_trace
  */