Merge glibc-ports into ports/ directory. glibc-2.16.90 glibc-2.16-ports-merge

1 files changed, 314 insertions, 0 deletions

diff --git a/ports/sysdeps/alpha/alphaev6/stxcpy.S b/ports/sysdeps/alpha/alphaev6/stxcpy.S
new file mode 100644
index 0000000000..bdc8e72eb6
--- /dev/null
+++ b/ports/sysdeps/alpha/alphaev6/stxcpy.S
@@ -0,0 +1,314 @@
+/* Copyright (C) 2000-2012 Free Software Foundation, Inc.
+   Contributed by Richard Henderson (rth@tamu.edu)
+   EV6 optimized by Rick Gorton <rick.gorton@alpha-processor.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 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* 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.
+*/
+
+
+#include <sysdep.h>
+
+	.arch ev6
+	.set noat
+	.set noreorder
+
+	.text
+	.type	__stxcpy, @function
+	.globl	__stxcpy
+	.usepv	__stxcpy, no
+
+	cfi_startproc
+	cfi_return_column (t9)
+
+	/* On entry to this basic block:
+	   t0 == the first destination word for masking back in
+	   t1 == the first source word.  */
+	.align 4
+stxcpy_aligned:
+	/* Create the 1st output word and detect 0's in the 1st input word.  */
+	lda	t2, -1		# E : build a mask against false zero
+	mskqh	t2, a1, t2	# U :   detection in the src word (stall)
+	mskqh	t1, a1, t3	# U :
+	ornot	t1, t2, t2	# E : (stall)
+
+	mskql	t0, a1, t0	# U : assemble the first output word
+	cmpbge	zero, t2, t10	# E : bits set iff null found
+	or	t0, t3, t1	# E : (stall)
+	bne	t10, $a_eos	# U : (stall)
+
+	/* On entry to this basic block:
+	   t0 == the first destination word for masking back in
+	   t1 == a source word not containing a null.  */
+	/* Nops here to separate store quads from load quads */
+
+$a_loop:
+	stq_u	t1, 0(a0)	# L :
+	addq	a0, 8, a0	# E :
+	nop
+	nop
+
+	ldq_u	t1, 0(a1)	# L : Latency=3
+	addq	a1, 8, a1	# E :
+	cmpbge	zero, t1, t10	# E : (3 cycle stall)
+	beq	t10, $a_loop	# U : (stall for t10)
+
+	/* Take care of the final (partial) word store.
+	   On entry to this basic block we have:
+	   t1 == the source word containing the null
+	   t10 == the cmpbge mask that found it.  */
+$a_eos:
+	negq	t10, t6		# E : find low bit set
+	and	t10, t6, t8	# E : (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	# E : (stall)
+	bne	t6, 1f		# U : (stall)
+
+	/* We're doing a partial word store and so need to combine
+	   our source and original destination words.  */
+	ldq_u	t0, 0(a0)	# L : Latency=3
+	subq	t8, 1, t6	# E :
+	zapnot	t1, t6, t1	# U : clear src bytes >= null (stall)
+	or	t8, t6, t10	# E : (stall)
+
+	zap	t0, t10, t0	# E : clear dst bytes <= null
+	or	t0, t1, t1	# E : (stall)
+	nop
+	nop
+
+1:	stq_u	t1, 0(a0)	# L :
+	ret	(t9)		# L0 : Latency=3
+	nop
+	nop
+
+	.align 4
+__stxcpy:
+	/* Are source and destination co-aligned?  */
+	xor	a0, a1, t0	# E :
+	unop			# E :
+	and	t0, 7, t0	# E : (stall)
+	bne	t0, $unaligned	# U : (stall)
+
+	/* We are co-aligned; take care of a partial first word.  */
+	ldq_u	t1, 0(a1)		# L : load first src word
+	and	a0, 7, t0		# E : take care not to load a word ...
+	addq	a1, 8, a1		# E :
+	beq	t0, stxcpy_aligned	# U : ... if we wont need it (stall)
+
+	ldq_u	t0, 0(a0)	# L :
+	br	stxcpy_aligned	# L0 : Latency=3
+	nop
+	nop
+
+
+/* The source and destination are not co-aligned.  Align the destination
+   and cope.  We have to be very careful about not reading too much and
+   causing a SEGV.  */
+
+	.align 4
+$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)	# L :
+	addq	a1, 8, a1	# E :
+	extql	t1, a1, t1	# U : (stall on a1)
+	extqh	t2, a1, t4	# U : (stall on a1)
+
+	mskql	t0, a0, t0	# U :
+	or	t1, t4, t1	# E :
+	mskqh	t1, a0, t1	# U : (stall on t1)
+	or	t0, t1, t1	# E : (stall on t1)
+
+	or	t1, t6, t6	# E :
+	cmpbge	zero, t6, t10	# E : (stall)
+	lda	t6, -1		# E : for masking just below
+	bne	t10, $u_final	# U : (stall)
+
+	mskql	t6, a1, t6		# U : mask out the bits we have
+	or	t6, t2, t2		# E :   already extracted before (stall)
+	cmpbge	zero, t2, t10		# E :   testing eos (stall)
+	bne	t10, $u_late_head_exit	# U : (stall)
+
+	/* 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)	# L : store first output word
+	addq	a0, 8, a0	# E :
+	extql	t2, a1, t0	# U : position ho-bits of lo word
+	ldq_u	t2, 8(a1)	# U : read next high-order source word
+
+	addq	a1, 8, a1	# E :
+	cmpbge	zero, t2, t10	# E : (stall for t2)
+	nop			# E :
+	bne	t10, $u_eos	# U : (stall)
+
+	/* Unaligned copy main loop.  In order to avoid reading too much,
+	   the loop is structured to detect zeros in aligned source words.
+	   This has, unfortunately, effectively pulled half of a loop
+	   iteration out into the head and half into the tail, but it does
+	   prevent nastiness from accumulating in the very thing we want
+	   to run as fast as possible.
+
+	   On entry to this basic block:
+	   t0 == the shifted high-order bits from the previous source word
+	   t2 == the unshifted current source word
+
+	   We further know that t2 does not contain a null terminator.  */
+
+	.align 3
+$u_loop:
+	extqh	t2, a1, t1	# U : extract high bits for current word
+	addq	a1, 8, a1	# E : (stall)
+	extql	t2, a1, t3	# U : extract low bits for next time (stall)
+	addq	a0, 8, a0	# E :
+
+	or	t0, t1, t1	# E : current dst word now complete
+	ldq_u	t2, 0(a1)	# L : Latency=3 load high word for next time
+	stq_u	t1, -8(a0)	# L : save the current word (stall)
+	mov	t3, t0		# E :
+
+	cmpbge	zero, t2, t10	# E : test new word for eos
+	beq	t10, $u_loop	# U : (stall)
+	nop
+	nop
+
+	/* We've found a zero somewhere in the source word we just read.
+	   If it resides in the lower half, we have one (probably partial)
+	   word to write out, and if it resides in the upper half, we
+	   have one full and one partial word left to write out.
+
+	   On entry to this basic block:
+	   t0 == the shifted high-order bits from the previous source word
+	   t2 == the unshifted current source word.  */
+$u_eos:
+	extqh	t2, a1, t1	# U :
+	or	t0, t1, t1	# E : first (partial) source word complete (stall)
+	cmpbge	zero, t1, t10	# E : is the null in this first bit? (stall)
+	bne	t10, $u_final	# U : (stall)
+
+$u_late_head_exit:
+	stq_u	t1, 0(a0)	# L : the null was in the high-order bits
+	addq	a0, 8, a0	# E :
+	extql	t2, a1, t1	# U :
+	cmpbge	zero, t1, t10	# E : (stall)
+
+	/* Take care of a final (probably partial) result word.
+	   On entry to this basic block:
+	   t1 == assembled source word
+	   t10 == cmpbge mask that found the null.  */
+$u_final:
+	negq	t10, t6		# E : isolate low bit set
+	and	t6, t10, t8	# E : (stall)
+	and	t8, 0x80, t6	# E : avoid dest word load if we can (stall)
+	bne	t6, 1f		# U : (stall)
+
+	ldq_u	t0, 0(a0)	# E :
+	subq	t8, 1, t6	# E :
+	or	t6, t8, t10	# E : (stall)
+	zapnot	t1, t6, t1	# U : kill source bytes >= null (stall)
+
+	zap	t0, t10, t0	# U : kill dest bytes <= null (2 cycle data stall)
+	or	t0, t1, t1	# E : (stall)
+	nop
+	nop
+
+1:	stq_u	t1, 0(a0)	# L :
+	ret	(t9)		# L0 : Latency=3
+	nop
+	nop
+
+	/* Unaligned copy entry point.  */
+	.align 4
+$unaligned:
+
+	ldq_u	t1, 0(a1)	# L : load first source word
+	and	a0, 7, t4	# E : find dest misalignment
+	and	a1, 7, t5	# E : find src misalignment
+	/* Conditionally load the first destination word and a bytemask
+	   with 0xff indicating that the destination byte is sacrosanct.  */
+	mov	zero, t0	# E :
+
+	mov	zero, t6	# E :
+	beq	t4, 1f		# U :
+	ldq_u	t0, 0(a0)	# L :
+	lda	t6, -1		# E :
+
+	mskql	t6, a0, t6	# U :
+	nop
+	nop
+	nop
+1:
+	subq	a1, t4, a1	# E : 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	# E :
+	beq	t8, $u_head	# U :
+	lda	t2, -1		# E : mask out leading garbage in source
+
+	mskqh	t2, t5, t2	# U :
+	ornot	t1, t2, t3	# E : (stall)
+	cmpbge	zero, t3, t10	# E : is there a zero? (stall)
+	beq	t10, $u_head	# U : (stall)
+
+	/* 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)	# L :
+	negq	t10, t6		# E : build bitmask of bytes <= zero
+	and	t6, t10, t8	# E : (stall)
+	and	a1, 7, t5	# E :
+
+	subq	t8, 1, t6	# E :
+	or	t6, t8, t10	# E : (stall)
+	srl	t8, t5, t8	# U : adjust final null return value
+	zapnot	t2, t10, t2	# U : prepare source word; mirror changes (stall)
+
+	and	t1, t2, t1	# E : to source validity mask
+	extql	t2, a1, t2	# U :
+	extql	t1, a1, t1	# U : (stall)
+	andnot	t0, t2, t0	# .. e1 : zero place for source to reside (stall)
+
+	or	t0, t1, t1	# e1    : and put it there
+	stq_u	t1, 0(a0)	# .. e0 : (stall)
+	ret	(t9)		# e1    :
+
+	cfi_endproc