[SPARC]: Fix several regset and ptrace bugs.

1) ptrace should pass 'current' to task_user_regset_view()

2) When fetching general registers using a 64-bit view, and
   the target is 32-bit, we have to convert.

3) Skip the whole register window get/set code block if
   the user isn't asking to access anything in there.

   Otherwise we have problems if the user doesn't have
   an address space setup.  Fetching ptrace register is
   still valid at such a time, and ptrace does not try
   to access the register window area of the regset.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/sparc/kernel/ptrace.c b/arch/sparc/kernel/ptrace.c
index 5b54f11f4e59..7f44ae69b29e 100644
--- a/arch/sparc/kernel/ptrace.c
+++ b/arch/sparc/kernel/ptrace.c
@@ -325,7 +325,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 	const struct user_regset_view *view;
 	int ret;
 
-	view = task_user_regset_view(child);
+	view = task_user_regset_view(current);
 
 	switch(request) {
 	case PTRACE_GETREGS: {