1 files changed, 44 insertions, 0 deletions

diff --git a/arch/ia64/lib/strncpy_from_user.S b/arch/ia64/lib/strncpy_from_user.S
new file mode 100644
index 00000000000..a504381f31e
--- /dev/null
+++ b/arch/ia64/lib/strncpy_from_user.S
@@ -0,0 +1,44 @@
+/*
+ * Just like strncpy() except that if a fault occurs during copying,
+ * -EFAULT is returned.
+ *
+ * Inputs:
+ *      in0:    address of destination buffer
+ *      in1:    address of string to be copied
+ *      in2:    length of buffer in bytes
+ * Outputs:
+ *      r8:     -EFAULT in case of fault or number of bytes copied if no fault
+ *
+ * Copyright (C) 1998-2001 Hewlett-Packard Co
+ * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by
+ *                       by Andreas Schwab <schwab@suse.de>).
+ */
+
+#include <asm/asmmacro.h>
+
+GLOBAL_ENTRY(__strncpy_from_user)
+        alloc r2=ar.pfs,3,0,0,0
+        mov r8=0
+        mov r9=in1
+        ;;
+        add r10=in1,in2
+        cmp.eq p6,p0=r0,in2
+(p6)    br.ret.spnt.many rp
+
+        // XXX braindead copy loop---this needs to be optimized
+.Loop1:
+        EX(.Lexit, ld1 r8=[in1],1)
+        ;;
+        EX(.Lexit, st1 [in0]=r8,1)
+        cmp.ne p6,p7=r8,r0
+        ;;
+(p6)    cmp.ne.unc p8,p0=in1,r10
+(p8)    br.cond.dpnt.few .Loop1
+        ;;
+(p6)    mov r8=in2              // buffer filled up---return buffer length
+(p7)    sub r8=in1,r9,1         // return string length (excluding NUL character)
+[.Lexit:]
+        br.ret.sptk.many rp
+END(__strncpy_from_user)