2 files changed, 100 insertions, 1 deletions

diff --git a/ipc/Makefile b/ipc/Makefile
index 4e1955ea815d..9075e172e52c 100644
--- a/ipc/Makefile
+++ b/ipc/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-$(CONFIG_SYSVIPC_COMPAT) += compat.o
-obj-$(CONFIG_SYSVIPC) += util.o msgutil.o msg.o sem.o shm.o ipcns_notifier.o
+obj-$(CONFIG_SYSVIPC) += util.o msgutil.o msg.o sem.o shm.o ipcns_notifier.o syscall.o
 obj-$(CONFIG_SYSVIPC_SYSCTL) += ipc_sysctl.o
 obj_mq-$(CONFIG_COMPAT) += compat_mq.o
 obj-$(CONFIG_POSIX_MQUEUE) += mqueue.o msgutil.o $(obj_mq-y)
diff --git a/ipc/syscall.c b/ipc/syscall.c
new file mode 100644
index 000000000000..355a3da9ec73
--- /dev/null
+++ b/ipc/syscall.c
@@ -0,0 +1,99 @@
+/*
+ * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
+ *
+ * This is really horribly ugly, and new architectures should just wire up
+ * the individual syscalls instead.
+ */
+#include <linux/unistd.h>
+
+#ifdef __ARCH_WANT_SYS_IPC
+#include <linux/errno.h>
+#include <linux/ipc.h>
+#include <linux/shm.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, int, second,
+                unsigned long, third, void __user *, ptr, long, fifth)
+{
+        int version, ret;
+
+        version = call >> 16; /* hack for backward compatibility */
+        call &= 0xffff;
+
+        switch (call) {
+        case SEMOP:
+                return sys_semtimedop(first, (struct sembuf __user *)ptr,
+                                      second, NULL);
+        case SEMTIMEDOP:
+                return sys_semtimedop(first, (struct sembuf __user *)ptr,
+                                      second,
+                                      (const struct timespec __user *)fifth);
+
+        case SEMGET:
+                return sys_semget(first, second, third);
+        case SEMCTL: {
+                union semun fourth;
+                if (!ptr)
+                        return -EINVAL;
+                if (get_user(fourth.__pad, (void __user * __user *) ptr))
+                        return -EFAULT;
+                return sys_semctl(first, second, third, fourth);
+        }
+
+        case MSGSND:
+                return sys_msgsnd(first, (struct msgbuf __user *) ptr,
+                                  second, third);
+        case MSGRCV:
+                switch (version) {
+                case 0: {
+                        struct ipc_kludge tmp;
+                        if (!ptr)
+                                return -EINVAL;
+
+                        if (copy_from_user(&tmp,
+                                           (struct ipc_kludge __user *) ptr,
+                                           sizeof(tmp)))
+                                return -EFAULT;
+                        return sys_msgrcv(first, tmp.msgp, second,
+                                           tmp.msgtyp, third);
+                }
+                default:
+                        return sys_msgrcv(first,
+                                           (struct msgbuf __user *) ptr,
+                                           second, fifth, third);
+                }
+        case MSGGET:
+                return sys_msgget((key_t) first, second);
+        case MSGCTL:
+                return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
+
+        case SHMAT:
+                switch (version) {
+                default: {
+                        unsigned long raddr;
+                        ret = do_shmat(first, (char __user *)ptr,
+                                       second, &raddr);
+                        if (ret)
+                                return ret;
+                        return put_user(raddr, (unsigned long __user *) third);
+                }
+                case 1:
+                        /*
+                         * This was the entry point for kernel-originating calls
+                         * from iBCS2 in 2.2 days.
+                         */
+                        return -EINVAL;
+                }
+        case SHMDT:
+                return sys_shmdt((char __user *)ptr);
+        case SHMGET:
+                return sys_shmget(first, second, third);
+        case SHMCTL:
+                return sys_shmctl(first, second,
+                                   (struct shmid_ds __user *) ptr);
+        default:
+                return -ENOSYS;
+        }
+}
+#endif