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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-10-25 16:10:40 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-10-25 16:10:19 +0200
commitbaa071588c3ffcc1a8721faf9337140e85d34bf6 (patch)
tree5aefe1db8edbc3dfb956669e657368673ad601ef /arch/s390/kernel
parent178514d7e3e8cfba087b3a208e22a54ce65e8f34 (diff)
downloadlinux-linaro-android-baa071588c3ffcc1a8721faf9337140e85d34bf6.tar.gz
[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>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/entry.S6
-rw-r--r--arch/s390/kernel/entry64.S4
2 files changed, 5 insertions, 5 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 736d7010629..5efce720298 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -254,12 +254,11 @@ sysc_do_svc:
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 @@ sysc_restart:
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 @@ sysc_tracesys:
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
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index e4038ea4dc5..a2be23922f4 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -246,7 +246,6 @@ sysc_saveall:
CREATE_STACK_FRAME __LC_SAVE_AREA
mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW
mvc SP_ILC(4,%r15),__LC_SVC_ILC
- stg %r7,SP_ARGS(%r15)
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
sysc_vtime:
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
@@ -274,6 +273,7 @@ sysc_nr_ok:
sysc_noemu:
#endif
tm __TI_flags+6(%r12),_TIF_SYSCALL
+ mvc SP_ARGS(8,%r15),SP_R7(%r15)
lgf %r8,0(%r7,%r10) # load address of system call routine
jnz sysc_tracesys
basr %r14,%r8 # call sys_xxxx
@@ -387,6 +387,7 @@ sysc_tracesys:
lgf %r8,0(%r7,%r10)
sysc_tracego:
lmg %r3,%r6,SP_R3(%r15)
+ mvc SP_ARGS(8,%r15),SP_R7(%r15)
lg %r2,SP_ORIG_R2(%r15)
basr %r14,%r8 # call sys_xxx
stg %r2,SP_R2(%r15) # store return value
@@ -953,7 +954,6 @@ cleanup_system_call:
CREATE_STACK_FRAME __LC_SAVE_AREA
mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW
mvc SP_ILC(4,%r15),__LC_SVC_ILC
- stg %r7,SP_ARGS(%r15)
mvc 8(8,%r12),__LC_THREAD_INFO
cleanup_vtime:
clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)