patch-2.4.2 linux/arch/cris/kernel/sys_cris.c

• Lines: 202
• Date: Thu Feb 8 16:32:44 2001
• Orig file: v2.4.1/linux/arch/cris/kernel/sys_cris.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/cris/kernel/sys_cris.c linux/arch/cris/kernel/sys_cris.c
@@ -0,0 +1,201 @@
+/* $Id: sys_cris.c,v 1.3 2000/08/02 13:59:02 bjornw Exp $
+ *
+ * linux/arch/cris/kernel/sys_etrax.c
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on some platforms.
+ * Since we don't have to do any backwards compatibility, our
+ * versions are done in the most "normal" way possible.
+ *
+ */
+
+#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 <asm/uaccess.h>
+#include <asm/ipc.h>
+#include <asm/segment.h>
+
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way Unix traditionally does this, though.
+ */
+asmlinkage int sys_pipe(unsigned long * fildes)
+{
+        int fd[2];
+        int error;
+
+        lock_kernel();
+        error = do_pipe(fd);
+        unlock_kernel();
+        if (!error) {
+                if (copy_to_user(fildes, fd, 2*sizeof(int)))
+                        error = -EFAULT;
+        }
+        return error;
+}
+
+/* sys_mmap used to take a ptr to a buffer instead containing the args
+ * but we support syscalls with 6 arguments now 
+ */
+
+asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
+				  unsigned long prot, unsigned long flags,
+                                  unsigned long fd, off_t offset)
+{
+	struct file * file = NULL;
+        int ret = -EBADF;
+	
+        lock_kernel();
+        if (!(flags & MAP_ANONYMOUS)) {
+                if (!(file = fget(fd)))
+                        goto out;
+        }
+        
+        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+        down(&current->mm->mmap_sem);
+        ret = do_mmap(file, addr, len, prot, flags, offset);
+        up(&current->mm->mmap_sem);
+        if (file)
+                fput(file);
+ out:
+        unlock_kernel();
+        return ret;
+}
+
+/* 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)
+{
+        int 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;
+}
+
+asmlinkage unsigned long old_mmap(unsigned long addr, size_t len, int prot,
+                                  int flags, int fd, off_t offset)
+{
+        return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+}
+
+asmlinkage long
+sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
+          unsigned long flags, unsigned long fd, unsigned long pgoff)
+{
+        return do_mmap2(addr, len, prot, flags, fd, pgoff);
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly. (same as arch/i386)
+ */
+
+asmlinkage int sys_ipc (uint call, int first, int second,
+			int third, void *ptr, long fifth)
+{
+	int version, ret;
+
+	version = call >> 16; /* hack for backward compatibility */
+	call &= 0xffff;
+
+	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);
+	case MSGRCV:
+		switch (version) {
+		case 0: {
+			struct ipc_kludge tmp;
+			if (!ptr)
+				return -EINVAL;
+			
+			if (copy_from_user(&tmp,
+					   (struct ipc_kludge *) ptr, 
+					   sizeof (tmp)))
+				return -EFAULT;
+			return sys_msgrcv (first, tmp.msgp, second,
+					   tmp.msgtyp, third);
+		}
+		default:
+			return sys_msgrcv (first,
+					   (struct msgbuf *) ptr,
+					   second, fifth, third);
+		}
+	case MSGGET:
+		return sys_msgget ((key_t) first, second);
+	case MSGCTL:
+		return sys_msgctl (first, second, (struct msqid_ds *) ptr);
+
+	case SHMAT:
+		switch (version) {
+		default: {
+			ulong raddr;
+			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			if (ret)
+				return ret;
+			return put_user (raddr, (ulong *) third);
+		}
+		case 1:	/* iBCS2 emulator entry point */
+			if (!segment_eq(get_fs(), get_ds()))
+				return -EINVAL;
+			return sys_shmat (first, (char *) ptr, second, (ulong *) third);
+		}
+	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;
+	}
+}
+
+/* apparently this is legacy - if we don't need this in Linux/CRIS we can remove it. */
+
+asmlinkage int sys_pause(void)
+{
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        return -ERESTARTNOHAND;
+}