--- /dev/null
+/*
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+unsigned long __generic_copy_from_user(void *to, const void __user *from,
+ unsigned long n)
+{
+ unsigned long tmp, res;
+
+ asm volatile ("\n"
+ " tst.l %0\n"
+ " jeq 2f\n"
+ "1: moves.l (%1)+,%3\n"
+ " move.l %3,(%2)+\n"
+ " subq.l #1,%0\n"
+ " jne 1b\n"
+ "2: btst #1,%5\n"
+ " jeq 4f\n"
+ "3: moves.w (%1)+,%3\n"
+ " move.w %3,(%2)+\n"
+ "4: btst #0,%5\n"
+ " jeq 6f\n"
+ "5: moves.b (%1)+,%3\n"
+ " move.b %3,(%2)+\n"
+ "6:\n"
+ " .section .fixup,\"ax\"\n"
+ " .even\n"
+ "10: move.l %0,%3\n"
+ "7: clr.l (%2)+\n"
+ " subq.l #1,%3\n"
+ " jne 7b\n"
+ " lsl.l #2,%0\n"
+ " btst #1,%5\n"
+ " jeq 8f\n"
+ "30: clr.w (%2)+\n"
+ " addq.l #2,%0\n"
+ "8: btst #0,%5\n"
+ " jeq 6b\n"
+ "50: clr.b (%2)+\n"
+ " addq.l #1,%0\n"
+ " jra 6b\n"
+ " .previous\n"
+ "\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 1b,10b\n"
+ " .long 3b,30b\n"
+ " .long 5b,50b\n"
+ " .previous"
+ : "=d" (res), "+a" (from), "+a" (to), "=&r" (tmp)
+ : "0" (n / 4), "d" (n & 3));
+
+ return res;
+}
+EXPORT_SYMBOL(__generic_copy_from_user);
+
+unsigned long __generic_copy_to_user(void __user *to, const void *from,
+ unsigned long n)
+{
+ unsigned long tmp, res;
+
+ asm volatile ("\n"
+ " tst.l %0\n"
+ " jeq 4f\n"
+ "1: move.l (%1)+,%3\n"
+ "2: moves.l %3,(%2)+\n"
+ "3: subq.l #1,%0\n"
+ " jne 1b\n"
+ "4: btst #1,%5\n"
+ " jeq 6f\n"
+ " move.w (%1)+,%3\n"
+ "5: moves.w %3,(%2)+\n"
+ "6: btst #0,%5\n"
+ " jeq 8f\n"
+ " move.b (%1)+,%3\n"
+ "7: moves.b %3,(%2)+\n"
+ "8:\n"
+ " .section .fixup,\"ax\"\n"
+ " .even\n"
+ "20: lsl.l #2,%0\n"
+ "50: add.l %5,%0\n"
+ " jra 7b\n"
+ " .previous\n"
+ "\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 2b,20b\n"
+ " .long 3b,20b\n"
+ " .long 5b,50b\n"
+ " .long 6b,50b\n"
+ " .long 7b,50b\n"
+ " .long 8b,50b\n"
+ " .previous"
+ : "=d" (res), "+a" (from), "+a" (to), "=&r" (tmp)
+ : "0" (n / 4), "d" (n & 3));
+
+ return res;
+}
+EXPORT_SYMBOL(__generic_copy_to_user);
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+long strncpy_from_user(char *dst, const char __user *src, long count)
+{
+ long res;
+ char c;
+
+ if (count <= 0)
+ return count;
+
+ asm volatile ("\n"
+ "1: moves.b (%2)+,%4\n"
+ " move.b %4,(%1)+\n"
+ " jeq 2f\n"
+ " subq.l #1,%3\n"
+ " jne 1b\n"
+ "2: sub.l %3,%0\n"
+ "3:\n"
+ " .section .fixup,\"ax\"\n"
+ " .even\n"
+ "10: move.l %5,%0\n"
+ " jra 3b\n"
+ " .previous\n"
+ "\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 1b,10b\n"
+ " .previous"
+ : "=d" (res), "+a" (dst), "+a" (src), "+r" (count), "=&d" (c)
+ : "i" (-EFAULT), "0" (count));
+
+ return res;
+}
+EXPORT_SYMBOL(strncpy_from_user);
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+long strnlen_user(const char __user *src, long n)
+{
+ char c;
+ long res;
+
+ asm volatile ("\n"
+ "1: subq.l #1,%1\n"
+ " jmi 3f\n"
+ "2: moves.b (%0)+,%2\n"
+ " tst.b %2\n"
+ " jne 1b\n"
+ " jra 4f\n"
+ "\n"
+ "3: addq.l #1,%0\n"
+ "4: sub.l %4,%0\n"
+ "5:\n"
+ " .section .fixup,\"ax\"\n"
+ " .even\n"
+ "20: sub.l %0,%0\n"
+ " jra 5b\n"
+ " .previous\n"
+ "\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 2b,20b\n"
+ " .previous\n"
+ : "=&a" (res), "+d" (n), "=&d" (c)
+ : "0" (src), "r" (src));
+
+ return res;
+}
+EXPORT_SYMBOL(strnlen_user);
+
+/*
+ * Zero Userspace
+ */
+
+unsigned long clear_user(void __user *to, unsigned long n)
+{
+ unsigned long res;
+
+ asm volatile ("\n"
+ " tst.l %0\n"
+ " jeq 3f\n"
+ "1: moves.l %2,(%1)+\n"
+ "2: subq.l #1,%0\n"
+ " jne 1b\n"
+ "3: btst #1,%4\n"
+ " jeq 5f\n"
+ "4: moves.w %2,(%1)+\n"
+ "5: btst #0,%4\n"
+ " jeq 7f\n"
+ "6: moves.b %2,(%1)\n"
+ "7:\n"
+ " .section .fixup,\"ax\"\n"
+ " .even\n"
+ "10: lsl.l #2,%0\n"
+ "40: add.l %4,%0\n"
+ " jra 7b\n"
+ " .previous\n"
+ "\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 1b,10b\n"
+ " .long 2b,10b\n"
+ " .long 4b,40b\n"
+ " .long 5b,40b\n"
+ " .long 6b,40b\n"
+ " .long 7b,40b\n"
+ " .previous"
+ : "=d" (res), "+a" (to)
+ : "r" (0), "0" (n / 4), "d" (n & 3));
+
+ return res;
+}
+EXPORT_SYMBOL(clear_user);
git://git.onelab.eu / linux-2.6.git / blobdiff