patch-2.4.2 linux/arch/s390x/lib/strncpy.S

• Lines: 31
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/arch/s390x/lib/strncpy.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/s390x/lib/strncpy.S linux/arch/s390x/lib/strncpy.S
@@ -0,0 +1,30 @@
+/*
+ *  arch/s390/kernel/strncpy.S
+ *    S390 strncpy routine
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ */
+
+/*
+ * R2 = address of destination
+ * R3 = address of source string
+ * R4 = max number of bytes to copy
+ */
+        .globl   strncpy
+strncpy:
+        LGR     1,2            # don't touch address in R2
+	LTR     4,4
+        JZ      strncpy_exit   # 0 bytes -> nothing to do
+	SGR     0,0
+strncpy_loop:
+        ICM     0,1,0(3)       # ICM sets the cc, IC does not
+	LA      3,1(3)
+        STC     0,0(1)
+	LA      1,1(1)
+        JZ      strncpy_exit   # ICM inserted a 0x00
+        BRCTG   4,strncpy_loop # R4 -= 1, jump to strncpy_loop if > 0
+strncpy_exit:
+        BR      14
+