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/*
* Just like strncpy() except for the return value. If no fault occurs during
* the copying, the number of bytes copied is returned. If a fault occurs,
* -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, 1999 Hewlett-Packard Co
* Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
*/
#define EX(x...) \
99: x; \
.section __ex_table,"a"; \
data4 @gprel(99b); \
data4 .Lexit-99b; \
.previous
.text
.psr abi64
.psr lsb
.lsb
.align 32
.global __strncpy_from_user
.proc __strncpy_from_user
__strncpy_from_user:
alloc r11=ar.pfs,3,0,0,0
mov r9=in1
add r10=in1,in2
// XXX braindead copy loop---this needs to be optimized
.Loop1:
EX(ld1 r8=[in1],1)
;;
st1 [in0]=r8,1
cmp.ltu p6,p0=in1,r10
;;
(p6) cmp.ne.and p6,p0=r8,r0
;;
(p6) br.cond.dpnt.few .Loop1
1: sub r8=in1,r9 // length of string (including NUL character)
.Lexit:
mov ar.pfs=r11
br.ret.sptk.few rp
.endp __strncpy_from_user
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