[S390] Add missing compat system call wrappers.

Add wrapper functions for the following compat system calls:
* readahead
* sendfile64
* tkill
* tgkill
* keyctl
This ensures that the high order bits of the parameter registers are correctly
sign extended.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 6035cd20c7a7..62c706eb0de6 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1767,3 +1767,41 @@ sys_dup3_wrapper:
 sys_epoll_create1_wrapper:
         lgfr    %r2,%r2                 # int
         jg      sys_epoll_create1       # branch to system call
+
+        .globl  sys32_readahead_wrapper
+sys32_readahead_wrapper:
+        lgfr    %r2,%r2                 # int
+        llgfr   %r3,%r3                 # u32
+        llgfr   %r4,%r4                 # u32
+        lgfr    %r5,%r5                 # s32
+        jg      sys32_readahead         # branch to system call
+
+        .globl  sys32_sendfile64_wrapper
+sys32_sendfile64_wrapper:
+        lgfr    %r2,%r2                 # int
+        lgfr    %r3,%r3                 # int
+        llgtr   %r4,%r4                 # compat_loff_t *
+        lgfr    %r5,%r5                 # s32
+        jg      sys32_sendfile64        # branch to system call
+
+        .globl  sys_tkill_wrapper
+sys_tkill_wrapper:
+        lgfr    %r2,%r2                 # pid_t
+        lgfr    %r3,%r3                 # int
+        jg      sys_tkill               # branch to system call
+
+        .globl  sys_tgkill_wrapper
+sys_tgkill_wrapper:
+        lgfr    %r2,%r2                 # pid_t
+        lgfr    %r3,%r3                 # pid_t
+        lgfr    %r4,%r4                 # int
+        jg      sys_tgkill              # branch to system call
+
+        .globl  compat_sys_keyctl_wrapper
+compat_sys_keyctl_wrapper:
+        llgfr   %r2,%r2                 # u32
+        llgfr   %r3,%r3                 # u32
+        llgfr   %r4,%r4                 # u32
+        llgfr   %r5,%r5                 # u32
+        llgfr   %r6,%r6                 # u32
+        jg      compat_sys_keyctl       # branch to system call