patch-2.3.99-pre8 linux/arch/s390/lib/strncpy.S
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- Lines: 31
- Date:
Fri May 12 11:41:45 2000
- Orig file:
v2.3.99-pre7/linux/arch/s390/lib/strncpy.S
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.99-pre7/linux/arch/s390/lib/strncpy.S linux/arch/s390/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:
+ LR 1,2 # don't touch address in R2
+ LTR 4,4
+ JZ strncpy_exit # 0 bytes -> nothing to do
+ SR 0,0
+strncpy_loop:
+ ICM 0,1,0(3) # ICM sets the cc, IC does not
+ LA 3,1(0,3)
+ STC 0,0(0,1)
+ LA 1,1(0,1)
+ JZ strncpy_exit # ICM inserted a 0x00
+ BRCT 4,strncpy_loop # R4 -= 1, jump to strncpy_loop if > 0
+strncpy_exit:
+ BR 14
+
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