summaryrefslogtreecommitdiff
path: root/arch/s390/kernel/entry.S
diff options
context:
space:
mode:
authorSven Schnelle <svens@linux.ibm.com>2021-05-05 22:01:09 +0200
committerVasily Gorbik <gor@linux.ibm.com>2021-06-07 17:06:58 +0200
commitaf9ad82290a58b3f1cc02d12459e3396eee04187 (patch)
tree44afe92bec4d71da8118b1057767a1ec5a795c12 /arch/s390/kernel/entry.S
parentd460bb6c6417588dd8b0907d34f69b237918812a (diff)
s390/entry: use assignment to read intcode / asm to copy gprs
arch/s390/kernel/syscall.c: In function __do_syscall: arch/s390/kernel/syscall.c:147:9: warning: memcpy reading 64 bytes from a region of size 0 [-Wstringop-overread] 147 | memcpy(&regs->gprs[8], S390_lowcore.save_area_sync, 8 * sizeof(unsigned long)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/s390/kernel/syscall.c:148:9: warning: memcpy reading 4 bytes from a region of size 0 [-Wstringop-overread] 148 | memcpy(&regs->int_code, &S390_lowcore.svc_ilc, sizeof(regs->int_code)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fix this by moving the gprs restore from C to assembly, and use a assignment for int_code instead of memcpy. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry.S')
-rw-r--r--arch/s390/kernel/entry.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 12de7a9c85b3..e7094ab8eb2c 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -276,6 +276,7 @@ ENTRY(system_call)
xgr %r10,%r10
xgr %r11,%r11
la %r2,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
+ mvc __PT_R8(64,%r2),__LC_SAVE_AREA_SYNC
lgr %r3,%r14
brasl %r14,__do_syscall
lctlg %c1,%c1,__LC_USER_ASCE