diff options
Diffstat (limited to 'arch/s390/lib/strncpy.S')
| -rw-r--r-- | arch/s390/lib/strncpy.S | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/s390/lib/strncpy.S b/arch/s390/lib/strncpy.S new file mode 100644 index 000000000..83578909c --- /dev/null +++ b/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 + |