[S390] Convert sys_clone to function with parameters.

Use function parameters instead of accessing the pt_regs structure
to get the parameters.
Also merge the 31 and 64 bit versions since they are identical.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

6 files changed, 13 insertions, 28 deletions

diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 9ab188d67a3d..f741cd49111a 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -801,23 +801,6 @@ asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
         return sys_write(fd, buf, count);
 }
 
-asmlinkage long sys32_clone(void)
-{
-        struct pt_regs *regs = task_pt_regs(current);
-        unsigned long clone_flags;
-        unsigned long newsp;
-        int __user *parent_tidptr, *child_tidptr;
-
-        clone_flags = regs->gprs[3] & 0xffffffffUL;
-        newsp = regs->orig_gpr2 & 0x7fffffffUL;
-        parent_tidptr = compat_ptr(regs->gprs[4]);
-        child_tidptr = compat_ptr(regs->gprs[5]);
-        if (!newsp)
-                newsp = regs->gprs[15];
-        return do_fork(clone_flags, newsp, regs, 0,
-                       parent_tidptr, child_tidptr);
-}
-
 /*
  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
diff --git a/arch/s390/kernel/compat_linux.h b/arch/s390/kernel/compat_linux.h
index 836a28842900..7cceb67ff8a2 100644
--- a/arch/s390/kernel/compat_linux.h
+++ b/arch/s390/kernel/compat_linux.h
@@ -222,7 +222,6 @@ unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg);
 long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg);
 long sys32_read(unsigned int fd, char __user * buf, size_t count);
 long sys32_write(unsigned int fd, char __user * buf, size_t count);
-long sys32_clone(void);
 long sys32_fadvise64(int fd, loff_t offset, size_t len, int advise);
 long sys32_fadvise64_64(struct fadvise64_64_args __user *args);
 long sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 624790042d41..28f8440d2ec3 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1840,3 +1840,11 @@ sys_perf_event_open_wrapper:
         lgfr    %r5,%r5                 # int
         llgfr   %r6,%r6                 # unsigned long
         jg      sys_perf_event_open     # branch to system call
+
+        .globl  sys_clone_wrapper
+sys_clone_wrapper:
+        llgfr   %r2,%r2                 # unsigned long
+        llgfr   %r3,%r3                 # unsigned long
+        llgtr   %r4,%r4                 # int *
+        llgtr   %r5,%r5                 # int *
+        jg      sys_clone               # branch to system call
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index 950c59c6688b..91fd78839c57 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -42,7 +42,8 @@ long sys_s390_fadvise64_64(struct fadvise64_64_args __user *args);
 long sys_s390_fallocate(int fd, int mode, loff_t offset, u32 len_high,
                         u32 len_low);
 long sys_fork(void);
-long sys_clone(void);
+long sys_clone(unsigned long newsp, unsigned long clone_flags,
+               int __user *parent_tidptr, int __user *child_tidptr);
 long sys_vfork(void);
 void execve_tail(void);
 long sys_execve(void);
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 5a43f27eec13..189d978f76d6 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -230,17 +230,11 @@ SYSCALL_DEFINE0(fork)
         return do_fork(SIGCHLD, regs->gprs[15], regs, 0, NULL, NULL);
 }
 
-SYSCALL_DEFINE0(clone)
+SYSCALL_DEFINE4(clone, unsigned long, newsp, unsigned long, clone_flags,
+                int __user *, parent_tidptr, int __user *, child_tidptr)
 {
         struct pt_regs *regs = task_pt_regs(current);
-        unsigned long clone_flags;
-        unsigned long newsp;
-        int __user *parent_tidptr, *child_tidptr;
 
-        clone_flags = regs->gprs[3];
-        newsp = regs->orig_gpr2;
-        parent_tidptr = (int __user *) regs->gprs[4];
-        child_tidptr = (int __user *) regs->gprs[5];
         if (!newsp)
                 newsp = regs->gprs[15];
         return do_fork(clone_flags, newsp, regs, 0,
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index 0b5083681e77..ff79d58e0eb3 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -128,7 +128,7 @@ SYSCALL(sys_sysinfo,sys_sysinfo,compat_sys_sysinfo_wrapper)
 SYSCALL(sys_ipc,sys_ipc,sys32_ipc_wrapper)
 SYSCALL(sys_fsync,sys_fsync,sys32_fsync_wrapper)
 SYSCALL(sys_sigreturn,sys_sigreturn,sys32_sigreturn)
-SYSCALL(sys_clone,sys_clone,sys32_clone)                        /* 120 */
+SYSCALL(sys_clone,sys_clone,sys_clone_wrapper)                  /* 120 */
 SYSCALL(sys_setdomainname,sys_setdomainname,sys32_setdomainname_wrapper)
 SYSCALL(sys_newuname,sys_s390_newuname,sys32_newuname_wrapper)
 NI_SYSCALL                                                      /* modify_ldt for i386 */