patch-2.4.2 linux/arch/s390x/kernel/sys_s390.c

• Lines: 206
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/arch/s390x/kernel/sys_s390.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/s390x/kernel/sys_s390.c linux/arch/s390x/kernel/sys_s390.c
@@ -0,0 +1,205 @@
+/*
+ *  arch/s390/kernel/sys_s390.c
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *
+ *  Derived from "arch/i386/kernel/sys_i386.c"
+ *
+ *  This file contains various random system calls that
+ *  have a non-standard calling sequence on the Linux/s390
+ *  platform.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/mman.h>
+#include <linux/file.h>
+#include <linux/utsname.h>
+
+#include <asm/uaccess.h>
+#include <asm/ipc.h>
+
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way Unix traditionally does this, though.
+ */
+asmlinkage long sys_pipe(unsigned long * fildes)
+{
+	int fd[2];
+	int error;
+
+	error = do_pipe(fd);
+	if (!error) {
+		if (copy_to_user(fildes, fd, 2*sizeof(int)))
+			error = -EFAULT;
+	}
+	return error;
+}
+
+/* common code for old and new mmaps */
+static inline long do_mmap2(
+	unsigned long addr, unsigned long len,
+	unsigned long prot, unsigned long flags,
+	unsigned long fd, unsigned long pgoff)
+{
+	long error = -EBADF;
+	struct file * file = NULL;
+
+	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+	if (!(flags & MAP_ANONYMOUS)) {
+		file = fget(fd);
+		if (!file)
+			goto out;
+	}
+
+	down(&current->mm->mmap_sem);
+	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+	up(&current->mm->mmap_sem);
+
+	if (file)
+		fput(file);
+out:
+	return error;
+}
+
+/*
+ * Perform the select(nd, in, out, ex, tv) and mmap() system
+ * calls. Linux/i386 didn't use to be able to handle more than
+ * 4 system call parameters, so these system calls used a memory
+ * block for parameter passing..
+ */
+
+struct mmap_arg_struct {
+	unsigned long addr;
+	unsigned long len;
+	unsigned long prot;
+	unsigned long flags;
+	unsigned long fd;
+	unsigned long offset;
+};
+
+asmlinkage long sys_mmap2(struct mmap_arg_struct *arg)
+{
+	struct mmap_arg_struct a;
+	int error = -EFAULT;
+
+	if (copy_from_user(&a, arg, sizeof(a)))
+		goto out;
+	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
+out:
+	return error;
+}
+
+asmlinkage long old_mmap(struct mmap_arg_struct *arg)
+{
+	struct mmap_arg_struct a;
+	long error = -EFAULT;
+
+	if (copy_from_user(&a, arg, sizeof(a)))
+		goto out;
+
+	error = -EINVAL;
+	if (a.offset & ~PAGE_MASK)
+		goto out;
+
+	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
+out:
+	return error;
+}
+
+extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+asmlinkage int sys_ipc (uint call, int first, int second, 
+                        unsigned long third, void *ptr)
+{
+        struct ipc_kludge tmp;
+	int ret;
+
+        switch (call) {
+        case SEMOP:
+                return sys_semop (first, (struct sembuf *)ptr, second);
+        case SEMGET:
+                return sys_semget (first, second, third);
+        case SEMCTL: {
+                union semun fourth;
+                if (!ptr)
+                        return -EINVAL;
+                if (get_user(fourth.__pad, (void **) ptr))
+                        return -EFAULT;
+                return sys_semctl (first, second, third, fourth);
+        } 
+        case MSGSND:
+		return sys_msgsnd (first, (struct msgbuf *) ptr, 
+                                   second, third);
+		break;
+        case MSGRCV:
+                if (!ptr)
+                        return -EINVAL;
+                if (copy_from_user (&tmp, (struct ipc_kludge *) ptr,
+                                    sizeof (struct ipc_kludge)))
+                        return -EFAULT;
+                return sys_msgrcv (first, tmp.msgp,
+                                   second, tmp.msgtyp, third);
+        case MSGGET:
+                return sys_msgget ((key_t) first, second);
+        case MSGCTL:
+                return sys_msgctl (first, second, (struct msqid_ds *) ptr);
+                
+	case SHMAT: {
+		ulong raddr;
+		ret = sys_shmat (first, (char *) ptr, second, &raddr);
+		if (ret)
+			return ret;
+		return put_user (raddr, (ulong *) third);
+		break;
+        }
+	case SHMDT: 
+		return sys_shmdt ((char *)ptr);
+	case SHMGET:
+		return sys_shmget (first, second, third);
+	case SHMCTL:
+		return sys_shmctl (first, second,
+                                   (struct shmid_ds *) ptr);
+	default:
+		return -EINVAL;
+
+	}
+        
+	return -EINVAL;
+}
+
+/*
+ * Old cruft
+ */
+asmlinkage int sys_uname(struct old_utsname * name)
+{
+	int err;
+	if (!name)
+		return -EFAULT;
+	down_read(&uts_sem);
+	err=copy_to_user(name, &system_utsname, sizeof (*name));
+	up_read(&uts_sem);
+	return err?-EFAULT:0;
+}
+
+asmlinkage int sys_pause(void)
+{
+	set_current_state(TASK_INTERRUPTIBLE);
+	schedule();
+	return -ERESTARTNOHAND;
+}
+