forked from luck/tmp_suning_uos_patched
e007c53397
Here we have another kind of deviation from the default case - a difference between exporting functions and non-functions. EXPORT_DATA_SYMBOL... is really different from EXPORT_SYMBOL... on ia64, and we need to use the right one when moving exports from *.c where C compiler has the required information to *.S, where we need to supply it manually. parisc64 will be another one like that. Tested-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
47 lines
1.2 KiB
ArmAsm
47 lines
1.2 KiB
ArmAsm
/*
|
|
* Just like strncpy() except that if a fault occurs during copying,
|
|
* -EFAULT is returned.
|
|
*
|
|
* Inputs:
|
|
* in0: address of destination buffer
|
|
* in1: address of string to be copied
|
|
* in2: length of buffer in bytes
|
|
* Outputs:
|
|
* r8: -EFAULT in case of fault or number of bytes copied if no fault
|
|
*
|
|
* Copyright (C) 1998-2001 Hewlett-Packard Co
|
|
* Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
|
|
*
|
|
* 00/03/06 D. Mosberger Fixed to return proper return value (bug found by
|
|
* by Andreas Schwab <schwab@suse.de>).
|
|
*/
|
|
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/export.h>
|
|
|
|
GLOBAL_ENTRY(__strncpy_from_user)
|
|
alloc r2=ar.pfs,3,0,0,0
|
|
mov r8=0
|
|
mov r9=in1
|
|
;;
|
|
add r10=in1,in2
|
|
cmp.eq p6,p0=r0,in2
|
|
(p6) br.ret.spnt.many rp
|
|
|
|
// XXX braindead copy loop---this needs to be optimized
|
|
.Loop1:
|
|
EX(.Lexit, ld1 r8=[in1],1)
|
|
;;
|
|
EX(.Lexit, st1 [in0]=r8,1)
|
|
cmp.ne p6,p7=r8,r0
|
|
;;
|
|
(p6) cmp.ne.unc p8,p0=in1,r10
|
|
(p8) br.cond.dpnt.few .Loop1
|
|
;;
|
|
(p6) mov r8=in2 // buffer filled up---return buffer length
|
|
(p7) sub r8=in1,r9,1 // return string length (excluding NUL character)
|
|
[.Lexit:]
|
|
br.ret.sptk.many rp
|
|
END(__strncpy_from_user)
|
|
EXPORT_SYMBOL(__strncpy_from_user)
|