[S390] cleanup system call parameter setup
Do the setup of the stack overflow argument for the sixth system
call parameter right before the branch to the system call function.
That simplifies the system call parameter access code.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 736d701..5efce72 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -254,12 +254,11 @@
bnl BASED(sysc_nr_ok)
lr %r7,%r1 # copy svc number to %r7
sysc_nr_ok:
- mvc SP_ARGS(4,%r15),SP_R7(%r15)
-sysc_do_restart:
sth %r7,SP_SVCNR(%r15)
sll %r7,2 # svc number *4
l %r8,BASED(.Lsysc_table)
tm __TI_flags+2(%r9),_TIF_SYSCALL
+ mvc SP_ARGS(4,%r15),SP_R7(%r15)
l %r8,0(%r7,%r8) # get system call addr.
bnz BASED(sysc_tracesys)
basr %r14,%r8 # call sys_xxxx
@@ -347,7 +346,7 @@
l %r7,SP_R2(%r15) # load new svc number
mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
lm %r2,%r6,SP_R2(%r15) # load svc arguments
- b BASED(sysc_do_restart) # restart svc
+ b BASED(sysc_nr_ok) # restart svc
#
# _TIF_SINGLE_STEP is set, call do_single_step
@@ -380,6 +379,7 @@
l %r8,0(%r7,%r8)
sysc_tracego:
lm %r3,%r6,SP_R3(%r15)
+ mvc SP_ARGS(4,%r15),SP_R7(%r15)
l %r2,SP_ORIG_R2(%r15)
basr %r14,%r8 # call sys_xxx
st %r2,SP_R2(%r15) # store return value
