From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/hexagon/mm/copy_user_template.S | 172 +++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 arch/hexagon/mm/copy_user_template.S

(limited to 'arch/hexagon/mm/copy_user_template.S')

diff --git a/arch/hexagon/mm/copy_user_template.S b/arch/hexagon/mm/copy_user_template.S
new file mode 100644
index 000000000..d297df01b
--- /dev/null
+++ b/arch/hexagon/mm/copy_user_template.S
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
+ */
+
+/* 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
-- 
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