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strncpy.S
Package: linux-2.4.20.tar.gz [view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 1k
Category:
Linux-Unix program
Development Platform:
Unix_Linux
- /*
- * 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
