copy_user_template.S
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/*
* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/* Numerology:
* WXYZ
* W: width in bytes
* X: Load=0, Store=1
* Y: Location 0=preamble,8=loop,9=epilog
* Z: Location=0,handler=9
*/
.text
.global FUNCNAME
.type FUNCNAME, @function
.p2align 5
FUNCNAME:
{
p0 = cmp.gtu(bytes,#0)
if (!p0.new) jump:nt .Ldone
r3 = or(dst,src)
r4 = xor(dst,src)
}
{
p1 = cmp.gtu(bytes,#15)
p0 = bitsclr(r3,#7)
if (!p0.new) jump:nt .Loop_not_aligned_8
src_dst_sav = combine(src,dst)
}
{
loopcount = lsr(bytes,#3)
if (!p1) jump .Lsmall
}
p3=sp1loop0(.Loop8,loopcount)
.Loop8:
8080:
8180:
{
if (p3) memd(dst++#8) = d_dbuf
d_dbuf = memd(src++#8)
}:endloop0
8190:
{
memd(dst++#8) = d_dbuf
bytes -= asl(loopcount,#3)
jump .Lsmall
}
.Loop_not_aligned_8:
{
p0 = bitsclr(r4,#7)
if (p0.new) jump:nt .Lalign
}
{
p0 = bitsclr(r3,#3)
if (!p0.new) jump:nt .Loop_not_aligned_4
p1 = cmp.gtu(bytes,#7)
}
{
if (!p1) jump .Lsmall
loopcount = lsr(bytes,#2)
}
p3=sp1loop0(.Loop4,loopcount)
.Loop4:
4080:
4180:
{
if (p3) memw(dst++#4) = w_dbuf
w_dbuf = memw(src++#4)
}:endloop0
4190:
{
memw(dst++#4) = w_dbuf
bytes -= asl(loopcount,#2)
jump .Lsmall
}
.Loop_not_aligned_4:
{
p0 = bitsclr(r3,#1)
if (!p0.new) jump:nt .Loop_not_aligned
p1 = cmp.gtu(bytes,#3)
}
{
if (!p1) jump .Lsmall
loopcount = lsr(bytes,#1)
}
p3=sp1loop0(.Loop2,loopcount)
.Loop2:
2080:
2180:
{
if (p3) memh(dst++#2) = w_dbuf
w_dbuf = memuh(src++#2)
}:endloop0
2190:
{
memh(dst++#2) = w_dbuf
bytes -= asl(loopcount,#1)
jump .Lsmall
}
.Loop_not_aligned: /* Works for as small as one byte */
p3=sp1loop0(.Loop1,bytes)
.Loop1:
1080:
1180:
{
if (p3) memb(dst++#1) = w_dbuf
w_dbuf = memub(src++#1)
}:endloop0
/* Done */
1190:
{
memb(dst) = w_dbuf
jumpr r31
r0 = #0
}
.Lsmall:
{
p0 = cmp.gtu(bytes,#0)
if (p0.new) jump:nt .Loop_not_aligned
}
.Ldone:
{
r0 = #0
jumpr r31
}
.falign
.Lalign:
1000:
{
if (p0.new) w_dbuf = memub(src)
p0 = tstbit(src,#0)
if (!p1) jump .Lsmall
}
1100:
{
if (p0) memb(dst++#1) = w_dbuf
if (p0) bytes = add(bytes,#-1)
if (p0) src = add(src,#1)
}
2000:
{
if (p0.new) w_dbuf = memuh(src)
p0 = tstbit(src,#1)
if (!p1) jump .Lsmall
}
2100:
{
if (p0) memh(dst++#2) = w_dbuf
if (p0) bytes = add(bytes,#-2)
if (p0) src = add(src,#2)
}
4000:
{
if (p0.new) w_dbuf = memw(src)
p0 = tstbit(src,#2)
if (!p1) jump .Lsmall
}
4100:
{
if (p0) memw(dst++#4) = w_dbuf
if (p0) bytes = add(bytes,#-4)
if (p0) src = add(src,#4)
jump FUNCNAME
}
.size FUNCNAME,.-FUNCNAME