[IA64] Tighten up unw_unwind_to_user check

Detect user space by the unwind frame with predicate PRED_USER_STACK
set, instead of a user space IP.  Tighten up the last ditch check for
running off the top of the kernel stack.

Based on a suggestion by David Mosberger, reworked to fit the current
tree.  This survives my stress test which used to break 2.6.9 kernels.
Unlike 2.6.11, the stress test now unwinds to the correct point, so
gdb can get the user space registers.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c
index d494ff647cacab37308ecfc4dbfcf34e9510b817..2776a074c6f10e92970c86b14c40af2689e80996 100644 (file)
--- a/arch/ia64/kernel/unwind.c
+++ b/arch/ia64/kernel/unwind.c
@@ -1943,23 +1943,30 @@ EXPORT_SYMBOL(unw_unwind);
 int
 unw_unwind_to_user (struct unw_frame_info *info)
 {
-       unsigned long ip, sp;
+       unsigned long ip, sp, pr = 0;
 
        while (unw_unwind(info) >= 0) {
-               if (unw_get_rp(info, &ip) < 0) {
-                       unw_get_ip(info, &ip);
-                       UNW_DPRINT(0, "unwind.%s: failed to read return pointer (ip=0x%lx)\n",
-                                  __FUNCTION__, ip);
-                       return -1;
-               }
                unw_get_sp(info, &sp);
-               if (sp >= (unsigned long)info->task + IA64_STK_OFFSET)
+               if ((long)((unsigned long)info->task + IA64_STK_OFFSET - sp)
+                   < IA64_PT_REGS_SIZE) {
+                       UNW_DPRINT(0, "unwind.%s: ran off the top of the kernel stack\n",
+                                  __FUNCTION__);
                        break;
-               if (ip < FIXADDR_USER_END)
+               }
+               if (unw_is_intr_frame(info) &&
+                   (pr & (1UL << PRED_USER_STACK)))
                        return 0;
+               if (unw_get_pr (info, &pr) < 0) {
+                       unw_get_rp(info, &ip);
+                       UNW_DPRINT(0, "unwind.%s: failed to read "
+                                  "predicate register (ip=0x%lx)\n",
+                               __FUNCTION__, ip);
+                       return -1;
+               }
        }
        unw_get_ip(info, &ip);
-       UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n", __FUNCTION__, ip);
+       UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n",
+                  __FUNCTION__, ip);
        return -1;
 }
 EXPORT_SYMBOL(unw_unwind_to_user);