tile: support GENERIC_KERNEL_THREAD and GENERIC_KERNEL_EXECVE

Also provide an optimized current_pt_regs() while we're at it.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index 6943515100f..58aad519b7d 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -1291,6 +1291,21 @@ STD_ENTRY(ret_from_fork)
         }
         STD_ENDPROC(ret_from_fork)
 
+STD_ENTRY(ret_from_kernel_thread)
+        jal     sim_notify_fork
+        jal     schedule_tail
+        FEEDBACK_REENTER(ret_from_fork)
+        {
+         move   r0, r31
+         jalr   r30
+        }
+        FEEDBACK_REENTER(ret_from_kernel_thread)
+        {
+         movei  r30, 0               /* not an NMI */
+         j      .Lresume_userspace   /* jump into middle of interrupt_return */
+        }
+        STD_ENDPROC(ret_from_kernel_thread)
+
         /*
          * Code for ill interrupt.
          */