patch-1.3.48 linux/arch/mips/kernel/sysmips.c

• Lines: 106
• Date: Wed Dec 13 12:39:44 1995
• Orig file: v1.3.47/linux/arch/mips/kernel/sysmips.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.47/linux/arch/mips/kernel/sysmips.c linux/arch/mips/kernel/sysmips.c
@@ -0,0 +1,105 @@
+/*
+ * MIPS specific syscalls
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995 by Ralf Baechle
+ */
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/utsname.h>
+
+#include <asm/cachectl.h>
+#include <asm/segment.h>
+#include <asm/sysmips.h>
+
+static inline size_t
+strnlen_user(const char *s, size_t count)
+{
+	return strnlen(s, count);
+}
+
+/*
+ * How long a hostname can we get from user space?
+ *  -EFAULT if invalid area or too long
+ *  0 if ok
+ *  >0 EFAULT after xx bytes
+ */
+static inline int
+get_max_hostname(unsigned long address)
+{
+	struct vm_area_struct * vma;
+
+	vma = find_vma(current, address);
+	if (!vma || vma->vm_start > address || !(vma->vm_flags & VM_READ))
+		return -EFAULT;
+	address = vma->vm_end - address;
+	if (address > PAGE_SIZE)
+		return 0;
+	if (vma->vm_next && vma->vm_next->vm_start == vma->vm_end &&
+	   (vma->vm_next->vm_flags & VM_READ))
+		return 0;
+	return address;
+}
+
+asmlinkage int
+sys_sysmips(int cmd, int arg1, int arg2, int arg3)
+{
+	int	*p;
+	char	*name;
+	int	flags, len, retval = -EINVAL;
+
+	switch(cmd)
+	{
+	case SETNAME:
+		if (!suser())
+			return -EPERM;
+		name = (char *) arg1;
+		len = get_max_hostname((unsigned long)name);
+		if (retval < 0)
+			return len;
+		len = strnlen_user(name, retval);
+		if (len == 0 || len > __NEW_UTS_LEN)
+			return -EINVAL;
+		memcpy_fromfs(system_utsname.nodename, name, len);
+		system_utsname.nodename[len] = '\0';
+		return 0;
+	case MIPS_ATOMIC_SET:
+		p = (int *) arg1;
+		retval = verify_area(VERIFY_WRITE, p, sizeof(*p));
+		if(retval)
+			return -EINVAL;
+		save_flags(flags);
+		cli();
+		retval = *p;
+		*p = arg2;
+		restore_flags(flags);
+		return retval;
+	case MIPS_FIXADE:
+		if (arg1)
+			current->tss.mflags |= MF_FIXADE;
+		else
+			current->tss.mflags |= MF_FIXADE;
+		retval = 0;
+		break;
+	case FLUSH_CACHE:
+		sys_cacheflush(0, ~0, BCACHE);
+		break;
+	}
+
+	return retval;
+}
+
+/*
+ * No implemented yet ...
+ */
+asmlinkage int
+sys_cachectl(char *addr, int nbytes, int op)
+{
+	return -ENOSYS;
+}