powerpc: switch to generic sys_execve()/kernel_execve()

the only non-obvious part is that current_pt_regs() is really needed
here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace
uses (the thing task_pt_regs() is intended for), but not for us.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d7f4fafc7515..1ca3d9fa48c4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -380,6 +380,12 @@ _GLOBAL(ret_from_kernel_thread)
         li      r3,0
         b       .do_exit        # no return
 
+_GLOBAL(__ret_from_kernel_execve)
+        addi    r1,r3,-STACK_FRAME_OVERHEAD
+        li      r10,1
+        std     r10,SOFTE(r1)
+        b       syscall_exit
+
         .section        ".toc","aw"
 DSCR_DEFAULT:
         .tc dscr_default[TC],dscr_default