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-rw-r--r--sysdeps/alpha/strncpy.S88
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diff --git a/sysdeps/alpha/strncpy.S b/sysdeps/alpha/strncpy.S
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-/* Copyright (C) 1996, 1997, 2003 Free Software Foundation, Inc.
- Contributed by Richard Henderson (rth@tamu.edu)
- 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* Copy no more than COUNT bytes of the null-terminated string from
- SRC to DST. If SRC does not cover all of COUNT, the balance is
- zeroed. */
-
-#include <sysdep.h>
-
- .set noat
- .set noreorder
-
- .text
-
-ENTRY(strncpy)
- ldgp gp, 0(pv)
-#ifdef PROF
- lda AT, _mcount
- jsr AT, (AT), _mcount
-#endif
- .prologue 1
-
- mov a0, v0 # set return value now
- beq a2, $zerocount
- jsr t9, __stxncpy # do the work of the copy
-
- bne a2, $multiword # do we have full words left?
-
- .align 3
- subq t8, 1, t2 # e0 : guess not
- subq t10, 1, t3 # .. e1 :
- or t2, t8, t2 # e0 : clear the bits between the last
- or t3, t10, t3 # .. e1 : written byte and the last byte in
- andnot t3, t2, t3 # e0 : COUNT
- zap t0, t3, t0 # e1 :
- stq_u t0, 0(a0) # e0 :
- ret # .. e1 :
-
-$multiword:
- subq t8, 1, t7 # e0 : clear the final bits in the prev
- or t7, t8, t7 # e1 : word
- zapnot t0, t7, t0 # e0 :
- subq a2, 1, a2 # .. e1 :
- stq_u t0, 0(a0) # e0 :
- addq a0, 8, a0 # .. e1 :
-
- beq a2, 1f # e1 :
- blbc a2, 0f # e1 :
-
- stq_u zero, 0(a0) # e0 : zero one word
- subq a2, 1, a2 # .. e1 :
- addq a0, 8, a0 # e0 :
- beq a2, 1f # .. e1 :
-
-0: stq_u zero, 0(a0) # e0 : zero two words
- subq a2, 2, a2 # .. e1 :
- stq_u zero, 8(a0) # e0 :
- addq a0, 16, a0 # .. e1 :
- bne a2, 0b # e1 :
- unop
-
-1: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final
- subq t10, 1, t7 # .. e1 : word
- or t7, t10, t7 # e0 :
- zap t0, t7, t0 # e1 (stall)
- stq_u t0, 0(a0) # e0 :
-
-$zerocount:
- ret # .. e1 :
-
- END(strncpy)
-libc_hidden_builtin_def (strncpy)