From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/frv/lib/memcpy.S | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 arch/frv/lib/memcpy.S

(limited to 'arch/frv/lib/memcpy.S')

diff --git a/arch/frv/lib/memcpy.S b/arch/frv/lib/memcpy.S
new file mode 100644
index 000000000..9c5965273
--- /dev/null
+++ b/arch/frv/lib/memcpy.S
@@ -0,0 +1,135 @@
+/* memcpy.S: optimised assembly memcpy
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+
+        .text
+        .p2align	4
+
+###############################################################################
+#
+# void *memcpy(void *to, const char *from, size_t count)
+#
+# - NOTE: must not use any stack. exception detection performs function return
+#         to caller's fixup routine, aborting the remainder of the copy
+#
+###############################################################################
+        .globl		memcpy,__memcpy_end
+        .type		memcpy,@function
+memcpy:
+	or.p		gr8,gr9,gr4
+	orcc		gr10,gr0,gr0,icc3
+	or.p		gr10,gr4,gr4
+	beqlr		icc3,#0
+
+	# optimise based on best common alignment for to, from & count
+	andicc.p	gr4,#0x0f,gr0,icc0
+	setlos		#8,gr11
+	andicc.p	gr4,#0x07,gr0,icc1
+	beq		icc0,#0,memcpy_16
+	andicc.p	gr4,#0x03,gr0,icc0
+	beq		icc1,#0,memcpy_8
+	andicc.p	gr4,#0x01,gr0,icc1
+	beq		icc0,#0,memcpy_4
+	setlos.p	#1,gr11
+	beq		icc1,#0,memcpy_2
+
+	# do byte by byte copy
+	sub.p		gr8,gr11,gr3
+	sub		gr9,gr11,gr9
+0:	ldubu.p		@(gr9,gr11),gr4
+	subicc		gr10,#1,gr10,icc0
+	stbu.p		gr4,@(gr3,gr11)
+	bne		icc0,#2,0b
+	bralr
+
+	# do halfword by halfword copy
+memcpy_2:
+	setlos		#2,gr11
+	sub.p		gr8,gr11,gr3
+	sub		gr9,gr11,gr9
+0:	lduhu.p		@(gr9,gr11),gr4
+	subicc		gr10,#2,gr10,icc0
+	sthu.p		gr4,@(gr3,gr11)
+	bne		icc0,#2,0b
+	bralr
+
+	# do word by word copy
+memcpy_4:
+	setlos		#4,gr11
+	sub.p		gr8,gr11,gr3
+	sub		gr9,gr11,gr9
+0:	ldu.p		@(gr9,gr11),gr4
+	subicc		gr10,#4,gr10,icc0
+	stu.p		gr4,@(gr3,gr11)
+	bne		icc0,#2,0b
+	bralr
+
+	# do double-word by double-word copy
+memcpy_8:
+	sub.p		gr8,gr11,gr3
+	sub		gr9,gr11,gr9
+0:	lddu.p		@(gr9,gr11),gr4
+	subicc		gr10,#8,gr10,icc0
+	stdu.p		gr4,@(gr3,gr11)
+	bne		icc0,#2,0b
+	bralr
+
+	# do quad-word by quad-word copy
+memcpy_16:
+	sub.p		gr8,gr11,gr3
+	sub		gr9,gr11,gr9
+0:	lddu		@(gr9,gr11),gr4
+	lddu.p		@(gr9,gr11),gr6
+	subicc		gr10,#16,gr10,icc0
+	stdu		gr4,@(gr3,gr11)
+	stdu.p		gr6,@(gr3,gr11)
+	bne		icc0,#2,0b
+	bralr
+__memcpy_end:
+
+	.size		memcpy, __memcpy_end-memcpy
+
+###############################################################################
+#
+# copy to/from userspace
+# - return the number of bytes that could not be copied (0 on complete success)
+#
+# long __memcpy_user(void *dst, const void *src, size_t count)
+#
+###############################################################################
+        .globl		__memcpy_user, __memcpy_user_error_lr, __memcpy_user_error_handler
+        .type		__memcpy_user,@function
+__memcpy_user:
+	movsg		lr,gr7
+	subi.p		sp,#8,sp
+	add		gr8,gr10,gr6		; calculate expected end address
+	stdi		gr6,@(sp,#0)
+
+	# abuse memcpy to do the dirty work
+	call		memcpy
+__memcpy_user_error_lr:
+	ldi.p		@(sp,#4),gr7
+	setlos		#0,gr8
+	jmpl.p		@(gr7,gr0)
+	addi		sp,#8,sp
+
+	# deal any exception generated by memcpy
+	# GR8 - memcpy's current dest address
+	# GR11 - memset's step value (index register for store insns)
+__memcpy_user_error_handler:
+	lddi.p		@(sp,#0),gr4		; load GR4 with dst+count, GR5 with ret addr
+	add		gr11,gr3,gr7
+	sub.p		gr4,gr7,gr8
+
+	addi		sp,#8,sp
+	jmpl		@(gr5,gr0)
+
+	.size		__memcpy_user, .-__memcpy_user
-- 
cgit v1.2.3-54-g00ecf