s390: convert to generic kernel_execve()
same situation as with alpha and arm - only massage needed
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 39c84e6..3d188f7 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -369,32 +369,13 @@
la %r2,0
br %r11 # do_exit
-#
-# kernel_execve function needs to deal with pt_regs that is not
-# at the usual place
-#
-ENTRY(kernel_execve)
- stmg %r12,%r15,96(%r15)
- lgr %r14,%r15
- aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
- stg %r14,__SF_BACKCHAIN(%r15)
- la %r12,STACK_FRAME_OVERHEAD(%r15)
- xc 0(__PT_SIZE,%r12),0(%r12)
- lgr %r5,%r12
- brasl %r14,do_execve
- ltgfr %r2,%r2
- je 0f
- aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
- lmg %r12,%r15,96(%r15)
- br %r14
- # execve succeeded.
-0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
- lg %r15,__LC_KERNEL_STACK # load ksp
- aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
- la %r11,STACK_FRAME_OVERHEAD(%r15)
- mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
- lg %r12,__LC_THREAD_INFO
+ENTRY(ret_from_kernel_execve)
+ ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
+ lgr %r15,%r2
+ lgr %r11,%r2
+ aghi %r15,-STACK_FRAME_OVERHEAD
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
+ lg %r12,__LC_THREAD_INFO
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_return