diff options
Diffstat (limited to 'sysdeps/s390/s390-64/memcpy.S')
| -rw-r--r-- | sysdeps/s390/s390-64/memcpy.S | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/sysdeps/s390/s390-64/memcpy.S b/sysdeps/s390/s390-64/memcpy.S index c59d3fbb79..008f026909 100644 --- a/sysdeps/s390/s390-64/memcpy.S +++ b/sysdeps/s390/s390-64/memcpy.S @@ -1,7 +1,6 @@ -/* Set a block of memory to some byte value. 64 bit S/390 version. - Copyright (C) 2001 Free Software Foundation, Inc. +/* memcpy - copy a block from source to destination. 64 bit S/390 version. + Copyright (C) 2000, 2001 Free Software Foundation, Inc. Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). - This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as @@ -19,8 +18,8 @@ Boston, MA 02111-1307, USA. */ /* INPUT PARAMETERS - %r2 = address to destination memory area - %r3 = address to source memory area + %r2 = address of destination memory area + %r3 = address of source memory area %r4 = number of bytes to copy. */ #include "sysdep.h" @@ -28,14 +27,19 @@ .text ENTRY(memcpy) - ltgr %r5,%r4 + ltgr %r4,%r4 + jz .L3 + aghi %r4,-1 # length - 1 + lgr %r1,%r2 # copy destination address + srag %r5,%r4,8 jz .L1 - lgr %r4,%r3 # %r4/%r5 = source ptr/len - lgr %r3,%r5 # %r2/%r3 = dest ptr/len - lgr %r0,%r2 # save source address -.L0: mvcle %r2,%r4,0 # thats it, MVCLE is your friend - jo .L0 - lgr %r2,%r0 # return value is source address -.L1: - br %r14 -END(memset) +.L0: mvc 0(256,%r1),0(%r3) # move in 256 byte chunks + la %r1,256(%r1) + la %r3,256(%r3) + brctg %r5,.L0 +.L1: bras %r5,.L2 # setup base pointer for execute + mvc 0(1,%r1),0(%r3) # instruction for execute +.L2: ex %r4,0(%r5) # execute mvc with length ((%r4)&255)+1 +.L3: br %r14 +END(memcpy) + |