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-/* Copyright (C) 1996, 1997 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 a null-terminated string from SRC to DST.
-
-   This is an internal routine used by strcpy, stpcpy, and strcat.
-   As such, it uses special linkage conventions to make implementation
-   of these public functions more efficient.
-
-   On input:
-	t9 = return address
-	a0 = DST
-	a1 = SRC
-
-   On output:
-	t8  = bitmask (with one bit set) indicating the last byte written
-	a0  = unaligned address of the last *word* written
-
-   Furthermore, v0, a3-a5, t11, and t12 are untouched.
-*/
-
-/* This is generally scheduled for the EV5, but should still be pretty
-   good for the EV4 too.  */
-
-#include <sysdep.h>
-
-	.set noat
-	.set noreorder
-
-	.text
-
-/* There is a problem with either gdb (as of 4.16) or gas (as of 2.7) that
-   doesn't like putting the entry point for a procedure somewhere in the
-   middle of the procedure descriptor.  Work around this by putting the
-   aligned copy in its own procedure descriptor */
-
-	.ent stxcpy_aligned
-	.align 3
-stxcpy_aligned:
-	.frame sp, 0, t9
-	.prologue 0
-
-	/* On entry to this basic block:
-	   t0 == the first destination word for masking back in
-	   t1 == the first source word.  */
-
-	/* Create the 1st output word and detect 0's in the 1st input word.  */
-	lda	t2, -1		# e1    : build a mask against false zero
-	mskqh	t2, a1, t2	# e0    :   detection in the src word
-	mskqh	t1, a1, t3	# e0    :
-	ornot	t1, t2, t2	# .. e1 :
-	mskql	t0, a1, t0	# e0    : assemble the first output word
-	cmpbge	zero, t2, t7	# .. e1 : bits set iff null found
-	or	t0, t3, t1	# e0    :
-	bne	t7, $a_eos	# .. e1 :
-
-	/* On entry to this basic block:
-	   t0 == the first destination word for masking back in
-	   t1 == a source word not containing a null.  */
-
-$a_loop:
-	stq_u	t1, 0(a0)	# e0    :
-	addq	a0, 8, a0	# .. e1 :
-	ldq_u	t1, 0(a1)	# e0    :
-	addq	a1, 8, a1	# .. e1 :
-	cmpbge	zero, t1, t7	# e0 (stall)
-	beq	t7, $a_loop	# .. e1 (zdb)
-
-	/* Take care of the final (partial) word store.
-	   On entry to this basic block we have:
-	   t1 == the source word containing the null
-	   t7 == the cmpbge mask that found it.  */
-$a_eos:
-	negq	t7, t6		# e0    : find low bit set
-	and	t7, t6, t8	# e1 (stall)
-
-	/* For the sake of the cache, don't read a destination word
-	   if we're not going to need it.  */
-	and	t8, 0x80, t6	# e0    :
-	bne	t6, 1f		# .. e1 (zdb)
-
-	/* We're doing a partial word store and so need to combine
-	   our source and original destination words.  */
-	ldq_u	t0, 0(a0)	# e0    :
-	subq	t8, 1, t6	# .. e1 :
-	zapnot	t1, t6, t1	# e0    : clear src bytes >= null
-	or	t8, t6, t7	# .. e1 :
-	zap	t0, t7, t0	# e0    : clear dst bytes <= null
-	or	t0, t1, t1	# e1    :
-
-1:	stq_u	t1, 0(a0)	# e0    :
-	ret	(t9)		# .. e1 :
-
-	.end stxcpy_aligned
-
-	.align 3
-	.ent __stxcpy
-	.globl __stxcpy
-__stxcpy:
-	.frame sp, 0, t9
-	.prologue 0
-
-	/* Are source and destination co-aligned?  */
-	xor	a0, a1, t0	# e0    :
-	unop			#       :
-	and	t0, 7, t0	# e0    :
-	bne	t0, $unaligned	# .. e1 :
-
-	/* We are co-aligned; take care of a partial first word.  */
-	ldq_u	t1, 0(a1)	# e0    : load first src word
-	and	a0, 7, t0	# .. e1 : take care not to load a word ...
-	addq	a1, 8, a1		# e0    :
-	beq	t0, stxcpy_aligned	# .. e1 : ... if we wont need it
-	ldq_u	t0, 0(a0)	# e0    :
-	br	stxcpy_aligned	# .. e1 :
-
-
-/* The source and destination are not co-aligned.  Align the destination
-   and cope.  We have to be very careful about not reading too much and
-   causing a SEGV.  */
-
-	.align 3
-$u_head:
-	/* We know just enough now to be able to assemble the first
-	   full source word.  We can still find a zero at the end of it
-	   that prevents us from outputting the whole thing.
-
-	   On entry to this basic block:
-	   t0 == the first dest word, for masking back in, if needed else 0
-	   t1 == the low bits of the first source word
-	   t6 == bytemask that is -1 in dest word bytes */
-
-	ldq_u	t2, 8(a1)	# e0    :
-	addq	a1, 8, a1	# .. e1 :
-
-	extql	t1, a1, t1	# e0    :
-	extqh	t2, a1, t4	# e0    :
-	mskql	t0, a0, t0	# e0    :
-	or	t1, t4, t1	# .. e1 :
-	mskqh	t1, a0, t1	# e0    :
-	or	t0, t1, t1	# e1    :
-
-	or	t1, t6, t6	# e0    :
-	cmpbge	zero, t6, t7	# .. e1 :
-	lda	t6, -1		# e0    : for masking just below
-	bne	t7, $u_final	# .. e1 :
-
-	mskql	t6, a1, t6		# e0    : mask out the bits we have
-	or	t6, t2, t2		# e1    :   already extracted before
-	cmpbge	zero, t2, t7		# e0    :   testing eos
-	bne	t7, $u_late_head_exit	# .. e1 (zdb)
-
-	/* Finally, we've got all the stupid leading edge cases taken care
-	   of and we can set up to enter the main loop.  */
-
-	stq_u	t1, 0(a0)	# e0    : store first output word
-	addq	a0, 8, a0	# .. e1 :
-	extql	t2, a1, t0	# e0    : position ho-bits of lo word
-	ldq_u	t2, 8(a1)	# .. e1 : read next high-order source word
-	addq	a1, 8, a1	# e0    :
-	cmpbge	zero, t2, t7	# .. e1 :
-	nop			# e0    :
-	bne	t7, $u_eos	# .. e1 :
-
-	/* Unaligned copy main loop.  In order to avoid reading too much,
-	   the loop is structured to detect zeros in aligned source words.
-	   This has, unfortunately, effectively pulled half of a loop
-	   iteration out into the head and half into the tail, but it does
-	   prevent nastiness from accumulating in the very thing we want
-	   to run as fast as possible.
-
-	   On entry to this basic block:
-	   t0 == the shifted high-order bits from the previous source word
-	   t2 == the unshifted current source word
-
-	   We further know that t2 does not contain a null terminator.  */
-
-	.align 3
-$u_loop:
-	extqh	t2, a1, t1	# e0    : extract high bits for current word
-	addq	a1, 8, a1	# .. e1 :
-	extql	t2, a1, t3	# e0    : extract low bits for next time
-	addq	a0, 8, a0	# .. e1 :
-	or	t0, t1, t1	# e0    : current dst word now complete
-	ldq_u	t2, 0(a1)	# .. e1 : load high word for next time
-	stq_u	t1, -8(a0)	# e0    : save the current word
-	mov	t3, t0		# .. e1 :
-	cmpbge	zero, t2, t7	# e0    : test new word for eos
-	beq	t7, $u_loop	# .. e1 :
-
-	/* We've found a zero somewhere in the source word we just read.
-	   If it resides in the lower half, we have one (probably partial)
-	   word to write out, and if it resides in the upper half, we
-	   have one full and one partial word left to write out.
-
-	   On entry to this basic block:
-	   t0 == the shifted high-order bits from the previous source word
-	   t2 == the unshifted current source word.  */
-$u_eos:
-	extqh	t2, a1, t1	# e0    :
-	or	t0, t1, t1	# e1    : first (partial) source word complete
-
-	cmpbge	zero, t1, t7	# e0    : is the null in this first bit?
-	bne	t7, $u_final	# .. e1 (zdb)
-
-$u_late_head_exit:
-	stq_u	t1, 0(a0)	# e0    : the null was in the high-order bits
-	addq	a0, 8, a0	# .. e1 :
-	extql	t2, a1, t1	# e0    :
-	cmpbge	zero, t1, t7	# .. e1 :
-
-	/* Take care of a final (probably partial) result word.
-	   On entry to this basic block:
-	   t1 == assembled source word
-	   t7 == cmpbge mask that found the null.  */
-$u_final:
-	negq	t7, t6		# e0    : isolate low bit set
-	and	t6, t7, t8	# e1    :
-
-	and	t8, 0x80, t6	# e0    : avoid dest word load if we can
-	bne	t6, 1f		# .. e1 (zdb)
-
-	ldq_u	t0, 0(a0)	# e0    :
-	subq	t8, 1, t6	# .. e1 :
-	or	t6, t8, t7	# e0    :
-	zapnot	t1, t6, t1	# .. e1 : kill source bytes >= null
-	zap	t0, t7, t0	# e0    : kill dest bytes <= null
-	or	t0, t1, t1	# e1    :
-
-1:	stq_u	t1, 0(a0)	# e0    :
-	ret	(t9)		# .. e1 :
-
-	/* Unaligned copy entry point.  */
-	.align 3
-$unaligned:
-
-	ldq_u	t1, 0(a1)	# e0    : load first source word
-
-	and	a0, 7, t4	# .. e1 : find dest misalignment
-	and	a1, 7, t5	# e0    : find src misalignment
-
-	/* Conditionally load the first destination word and a bytemask
-	   with 0xff indicating that the destination byte is sacrosanct.  */
-
-	mov	zero, t0	# .. e1 :
-	mov	zero, t6	# e0    :
-	beq	t4, 1f		# .. e1 :
-	ldq_u	t0, 0(a0)	# e0    :
-	lda	t6, -1		# .. e1 :
-	mskql	t6, a0, t6	# e0    :
-1:
-	subq	a1, t4, a1	# .. e1 : sub dest misalignment from src addr
-
-	/* If source misalignment is larger than dest misalignment, we need
-	   extra startup checks to avoid SEGV.  */
-
-	cmplt	t4, t5, t8	# e0    :
-	beq	t8, $u_head	# .. e1 (zdb)
-
-	lda	t2, -1		# e1    : mask out leading garbage in source
-	mskqh	t2, t5, t2	# e0    :
-	nop			# e0    :
-	ornot	t1, t2, t3	# .. e1 :
-	cmpbge	zero, t3, t7	# e0    : is there a zero?
-	beq	t7, $u_head	# .. e1 (zdb)
-
-	/* At this point we've found a zero in the first partial word of
-	   the source.  We need to isolate the valid source data and mask
-	   it into the original destination data.  (Incidentally, we know
-	   that we'll need at least one byte of that original dest word.) */
-
-	ldq_u	t0, 0(a0)	# e0    :
-
-	negq	t7, t6		# .. e1 : build bitmask of bytes <= zero
-	and	t6, t7, t8	# e0    :
-	and	a1, 7, t5	# .. e1 :
-	subq	t8, 1, t6	# e0    :
-	or	t6, t8, t7	# e1    :
-	srl	t8, t5, t8	# e0    : adjust final null return value
-
-	zapnot	t2, t7, t2	# .. e1 : prepare source word; mirror changes
-	and	t1, t2, t1	# e1    : to source validity mask
-	extql	t2, a1, t2	# .. e0 :
-	extql	t1, a1, t1	# e0    :
-
-	andnot	t0, t2, t0	# .. e1 : zero place for source to reside
-	or	t0, t1, t1	# e1    : and put it there
-	stq_u	t1, 0(a0)	# .. e0 :
-	ret	(t9)
-
-	.end __stxcpy