score: Add support for Sunplus S+core architecture

This is the complete set of new arch Score's files for linux.
Score instruction set support 16bits, 32bits and 64bits instruction,
Score SOC had been used in game machine and LCD TV.

Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

10 files changed, 771 insertions, 0 deletions

diff --git a/arch/score/lib/Makefile b/arch/score/lib/Makefile
new file mode 100644
index 00000000000..553e30e81fa
--- /dev/null
+++ b/arch/score/lib/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for SCORE-specific library files..
+#
+
+lib-y += string.o checksum.o checksum_copy.o
+
+# libgcc-style stuff needed in the kernel
+obj-y += ashldi3.o ashrdi3.o cmpdi2.o lshrdi3.o ucmpdi2.o
diff --git a/arch/score/lib/ashldi3.c b/arch/score/lib/ashldi3.c
new file mode 100644
index 00000000000..15691a91043
--- /dev/null
+++ b/arch/score/lib/ashldi3.c
@@ -0,0 +1,46 @@
+/*
+ * arch/score/lib/ashldi3.c
+ *
+ * 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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include "libgcc.h"
+
+long long __ashldi3(long long u, word_type b)
+{
+	DWunion uu, w;
+	word_type bm;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+	bm = 32 - b;
+
+	if (bm <= 0) {
+		w.s.low = 0;
+		w.s.high = (unsigned int) uu.s.low << -bm;
+	} else {
+		const unsigned int carries = (unsigned int) uu.s.low >> bm;
+
+		w.s.low = (unsigned int) uu.s.low << b;
+		w.s.high = ((unsigned int) uu.s.high << b) | carries;
+	}
+
+	return w.ll;
+}
+EXPORT_SYMBOL(__ashldi3);
diff --git a/arch/score/lib/ashrdi3.c b/arch/score/lib/ashrdi3.c
new file mode 100644
index 00000000000..d9814a5d8d3
--- /dev/null
+++ b/arch/score/lib/ashrdi3.c
@@ -0,0 +1,48 @@
+/*
+ * arch/score/lib/ashrdi3.c
+ *
+ * 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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include "libgcc.h"
+
+long long __ashrdi3(long long u, word_type b)
+{
+	DWunion uu, w;
+	word_type bm;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+	bm = 32 - b;
+
+	if (bm <= 0) {
+		/* w.s.high = 1..1 or 0..0 */
+		w.s.high =
+		    uu.s.high >> 31;
+		w.s.low = uu.s.high >> -bm;
+	} else {
+		const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+		w.s.high = uu.s.high >> b;
+		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+	}
+
+	return w.ll;
+}
+EXPORT_SYMBOL(__ashrdi3);
diff --git a/arch/score/lib/checksum.S b/arch/score/lib/checksum.S
new file mode 100644
index 00000000000..706157edc7d
--- /dev/null
+++ b/arch/score/lib/checksum.S
@@ -0,0 +1,255 @@
+/*
+ * arch/score/lib/csum_partial.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *  Chen Liqin <liqin.chen@sunplusct.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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/linkage.h>
+
+#define ADDC(sum,reg)			\
+	add	sum, sum, reg;		\
+	cmp.c	reg, sum;		\
+	bleu	9f;			\
+	addi	sum, 0x1;		\
+9:
+
+#define CSUM_BIGCHUNK(src, offset, sum)		\
+	lw	r8, [src, offset + 0x00];	\
+	lw	r9, [src, offset + 0x04];	\
+	lw	r10, [src, offset + 0x08];	\
+	lw	r11, [src, offset + 0x0c];	\
+	ADDC(sum, r8);				\
+	ADDC(sum, r9);				\
+	ADDC(sum, r10);				\
+	ADDC(sum, r11);				\
+	lw	r8, [src, offset + 0x10];	\
+	lw	r9, [src, offset + 0x14];	\
+	lw	r10, [src, offset + 0x18]; 	\
+	lw	r11, [src, offset + 0x1c]; 	\
+	ADDC(sum, r8);				\
+	ADDC(sum, r9);				\
+	ADDC(sum, r10);				\
+	ADDC(sum, r11);				\
+
+#define src r4
+#define dest r5
+#define sum r27
+
+	.text
+/* unknown src alignment and < 8 bytes to go */
+small_csumcpy:
+	mv	r5, r10
+	ldi	r9, 0x0
+	cmpi.c	r25, 0x1
+	beq pass_small_set_t7	/*already set, jump to pass_small_set_t7*/
+	andri.c	r25,r4 , 0x1	/*Is src 2 bytes aligned?*/
+
+pass_small_set_t7:
+	beq	aligned
+	cmpi.c	r5, 0x0
+	beq	fold
+	lbu	r9, [src]
+	slli	r9,r9, 0x8	/*Little endian*/
+	ADDC(sum, r9)
+	addi	src, 0x1
+	subi.c	r5, 0x1
+
+	/*len still a full word */
+aligned:
+	andri.c r8, r5, 0x4	/*Len >= 4?*/
+	beq	len_less_4bytes
+
+	/* Still a full word (4byte) to go,and the src is word aligned.*/
+	andri.c	r8, src, 0x3	/*src is 4bytes aligned, so use LW!!*/
+	beq	four_byte_aligned
+	lhu 	r9, [src]
+	addi	src, 2
+	ADDC(sum, r9)
+	lhu 	r9, [src]
+	addi	src, 2
+	ADDC(sum, r9)
+	b len_less_4bytes
+
+four_byte_aligned:		/* Len >=4 and four byte aligned */
+	lw	r9, [src]
+	addi	src, 4
+	ADDC(sum, r9)
+
+len_less_4bytes:		/* 2 byte aligned aligned and length<4B */
+	andri.c r8, r5, 0x2
+	beq	len_less_2bytes
+	lhu	r9, [src]
+	addi	src, 0x2	/* src+=2 */
+	ADDC(sum, r9)
+
+len_less_2bytes:		/* len = 1 */
+	andri.c r8, r5, 0x1
+	beq 	fold		/* less than 2 and not equal 1--> len=0 -> fold */
+	lbu	r9, [src]
+
+fold_ADDC:
+	ADDC(sum, r9)
+fold:
+	/* fold checksum */
+	slli	r26, sum, 16
+	add	sum, sum, r26
+	cmp.c	r26, sum
+	srli	sum, sum, 16
+	bleu 	1f 		/* if r26<=sum */
+	addi	sum, 0x1 	/* r26>sum */
+1:
+	/* odd buffer alignment? r25 was set in csum_partial */
+	cmpi.c	r25, 0x0
+	beq	1f
+	slli	r26, sum, 8
+	srli	sum, sum, 8
+	or	sum, sum, r26
+	andi	sum, 0xffff
+1:
+	.set	optimize
+	/* Add the passed partial csum. */
+	ADDC(sum, r6)
+	mv	r4, sum
+	br	r3
+	.set	volatile
+
+	.align	5
+ENTRY(csum_partial)
+	ldi sum, 0
+	ldi r25, 0
+	mv r10, r5
+	cmpi.c	r5, 0x8
+	blt	small_csumcpy		/* < 8(singed) bytes to copy */
+	cmpi.c	r5, 0x0
+	beq	out
+	andri.c	r25, src, 0x1		/* odd buffer? */
+
+	beq	word_align
+hword_align:				/* 1 byte */
+	lbu	r8, [src]
+	subi	r5, 0x1
+	slli	r8, r8, 8
+	ADDC(sum, r8)
+	addi	src, 0x1
+
+word_align:				/* 2 bytes */
+	andri.c r8, src, 0x2		/* 4bytes(dword)_aligned? */
+	beq	dword_align		/* not, maybe dword_align */
+	lhu	r8, [src]
+	subi	r5, 0x2
+	ADDC(sum, r8)
+	addi	src, 0x2
+
+dword_align:				/* 4bytes */
+	mv 	r26, r5			/* maybe useless when len >=56 */
+	ldi 	r8, 56
+	cmp.c	r8, r5
+	bgtu	do_end_words		/* if a1(len)<t0(56) ,unsigned */
+	andri.c	r26, src, 0x4
+	beq	qword_align
+	lw	r8, [src]
+	subi	r5, 0x4
+	ADDC(sum, r8)
+	addi	src, 0x4
+
+qword_align:				/* 8 bytes */
+	andri.c r26, src, 0x8
+	beq	oword_align
+	lw	r8, [src, 0x0]
+	lw	r9, [src, 0x4]
+	subi	r5, 0x8			/* len-=0x8 */
+	ADDC(sum, r8)
+	ADDC(sum, r9)
+	addi	src, 0x8
+
+oword_align:				/* 16bytes */
+	andri.c	r26, src, 0x10
+	beq	begin_movement
+	lw	r10, [src, 0x08]
+	lw	r11, [src, 0x0c]
+	lw	r8, [src, 0x00]
+	lw	r9, [src, 0x04]
+	ADDC(sum, r10)
+	ADDC(sum, r11)
+	ADDC(sum, r8)
+	ADDC(sum, r9)
+	subi	r5, 0x10
+	addi	src, 0x10
+
+begin_movement:
+	srli.c	r26, r5, 0x7		/* len>=128? */
+	beq	1f			/* len<128 */
+
+/* r26 is the result that computed in oword_align */
+move_128bytes:
+	CSUM_BIGCHUNK(src, 0x00, sum)
+	CSUM_BIGCHUNK(src, 0x20, sum)
+	CSUM_BIGCHUNK(src, 0x40, sum)
+	CSUM_BIGCHUNK(src, 0x60, sum)
+	subi.c	r26, 0x01		/* r26 equals len/128 */
+	addi	src, 0x80
+	bne	move_128bytes
+
+1:	/* len<128,we process 64byte here */
+	andri.c	r10, r5, 0x40
+	beq	1f
+
+move_64bytes:
+	CSUM_BIGCHUNK(src, 0x00, sum)
+	CSUM_BIGCHUNK(src, 0x20, sum)
+	addi	src, 0x40
+
+1:					/* len<64 */
+	andri	r26, r5, 0x1c		/* 0x1c=28 */
+	andri.c	r10, r5, 0x20
+	beq	do_end_words		/* decided by andri */
+
+move_32bytes:
+	CSUM_BIGCHUNK(src, 0x00, sum)
+	andri	r26, r5, 0x1c
+	addri	src, src, 0x20
+
+do_end_words:				/* len<32 */
+	/* r26 was set already in dword_align */
+	cmpi.c	r26, 0x0
+	beq	maybe_end_cruft		/* len<28 or len<56 */
+	srli	r26, r26, 0x2
+
+end_words:
+	lw	r8, [src]
+	subi.c	r26, 0x1		/* unit is 4 byte */
+	ADDC(sum, r8)
+	addi	src, 0x4
+	cmpi.c	r26, 0x0
+	bne	end_words		/* r26!=0 */
+
+maybe_end_cruft:			/* len<4 */
+	andri	r10, r5, 0x3
+
+small_memcpy:
+	mv	r5, r10
+	j	small_csumcpy
+
+out:
+	mv	r4, sum
+	br	r3
+
+END(csum_partial)
diff --git a/arch/score/lib/checksum_copy.c b/arch/score/lib/checksum_copy.c
new file mode 100644
index 00000000000..04565dd3ded
--- /dev/null
+++ b/arch/score/lib/checksum_copy.c
@@ -0,0 +1,52 @@
+/*
+ * arch/score/lib/csum_partial_copy.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *  Chen Liqin <liqin.chen@sunplusct.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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <net/checksum.h>
+
+#include <asm/uaccess.h>
+
+unsigned int csum_partial_copy(const char *src, char *dst,
+				int len, unsigned int sum)
+{
+	sum = csum_partial(src, len, sum);
+	memcpy(dst, src, len);
+
+	return sum;
+}
+
+unsigned int csum_partial_copy_from_user(const char *src, char *dst,
+					int len, unsigned int sum,
+					int *err_ptr)
+{
+	int missing;
+
+	missing = copy_from_user(dst, src, len);
+	if (missing) {
+		memset(dst + len - missing, 0, missing);
+		*err_ptr = -EFAULT;
+	}
+
+	return csum_partial(dst, len, sum);
+}
diff --git a/arch/score/lib/cmpdi2.c b/arch/score/lib/cmpdi2.c
new file mode 100644
index 00000000000..1ed5290c66e
--- /dev/null
+++ b/arch/score/lib/cmpdi2.c
@@ -0,0 +1,44 @@
+/*
+ * arch/score/lib/cmpdi2.c
+ *
+ * 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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include "libgcc.h"
+
+word_type __cmpdi2(long long a, long long b)
+{
+	const DWunion au = {
+		.ll = a
+	};
+	const DWunion bu = {
+		.ll = b
+	};
+
+	if (au.s.high < bu.s.high)
+		return 0;
+	else if (au.s.high > bu.s.high)
+		return 2;
+
+	if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
+		return 0;
+	else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
+		return 2;
+
+	return 1;
+}
+EXPORT_SYMBOL(__cmpdi2);
diff --git a/arch/score/lib/libgcc.h b/arch/score/lib/libgcc.h
new file mode 100644
index 00000000000..0f12543d9f3
--- /dev/null
+++ b/arch/score/lib/libgcc.h
@@ -0,0 +1,37 @@
+/*
+ * arch/score/lib/libgcc.h
+ *
+ * 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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#include <asm/byteorder.h>
+
+typedef int word_type __attribute__((mode(__word__)));
+
+struct DWstruct {
+	int low, high;
+};
+
+typedef union {
+	struct DWstruct s;
+	long long ll;
+} DWunion;
+
+#endif /* __ASM_LIBGCC_H */
diff --git a/arch/score/lib/lshrdi3.c b/arch/score/lib/lshrdi3.c
new file mode 100644
index 00000000000..ce21175fd79
--- /dev/null
+++ b/arch/score/lib/lshrdi3.c
@@ -0,0 +1,47 @@
+/*
+ * arch/score/lib/lshrdi3.c
+ *
+ * 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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+
+#include <linux/module.h>
+#include "libgcc.h"
+
+long long __lshrdi3(long long u, word_type b)
+{
+	DWunion uu, w;
+	word_type bm;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+	bm = 32 - b;
+
+	if (bm <= 0) {
+		w.s.high = 0;
+		w.s.low = (unsigned int) uu.s.high >> -bm;
+	} else {
+		const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+		w.s.high = (unsigned int) uu.s.high >> b;
+		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+	}
+
+	return w.ll;
+}
+EXPORT_SYMBOL(__lshrdi3);
diff --git a/arch/score/lib/string.S b/arch/score/lib/string.S
new file mode 100644
index 00000000000..943d0911ea8
--- /dev/null
+++ b/arch/score/lib/string.S
@@ -0,0 +1,196 @@
+/*
+ * arch/score/lib/string.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/linkage.h>
+#include <asm-generic/errno.h>
+
+	.text
+	.align 2
+ENTRY(__strncpy_from_user)
+	cmpi.c	r6, 0
+	mv	r9, r6
+	ble	.L2
+0:	lbu	r7, [r5]
+	ldi	r8, 0
+1:	sb	r7, [r4]
+2:	lb	r6, [r5]
+	cmp.c	r6, r8
+	beq	.L2
+
+.L5:
+	addi	r8, 1
+	cmp.c	r8, r9
+	beq	.L7
+3:	lbu	r6, [r5, 1]+
+4:	sb	r6, [r4, 1]+
+5:	lb	r7, [r5]
+	cmpi.c	r7, 0
+	bne	.L5
+.L7:
+	mv	r4, r8
+	br	r3
+.L2:
+	ldi	r8, 0
+	mv	r4, r8
+	br	r3
+	.section .fixup, "ax"
+99:
+	ldi	r4, -EFAULT
+	br	r3
+	.previous
+	.section __ex_table, "a"
+	.align	2
+	.word	0b ,99b
+	.word	1b ,99b
+	.word	2b ,99b
+	.word	3b ,99b
+	.word	4b ,99b
+	.word	5b ,99b
+	.previous
+
+	.align 2
+ENTRY(__strnlen_user)
+	cmpi.c	r5, 0
+	ble	.L11
+0:	lb	r6, [r4]
+	ldi	r7, 0
+	cmp.c	r6, r7
+	beq	.L11
+.L15:
+	addi	r7, 1
+	cmp.c	r7, r5
+	beq	.L23
+1:	lb	r6, [r4,1]+
+	cmpi.c	r6, 0
+	bne	.L15
+.L23:
+	addri	r4, r7, 1
+	br	r3
+
+.L11:
+	ldi	r4, 1
+	br	r3
+	.section .fixup, "ax"
+99:
+	ldi	r4, 0
+	br	r3
+
+	.section __ex_table,"a"
+	.align 2
+	.word	0b, 99b
+	.word	1b, 99b
+	.previous
+
+	.align 2
+ENTRY(__strlen_user)
+0:	lb	r6, [r4]
+	mv	r7, r4
+	extsb	r6, r6
+	cmpi.c	r6, 0
+	mv	r4, r6
+	beq	.L27
+.L28:
+1:	lb	r6, [r7, 1]+
+	addi	r6, 1
+	cmpi.c	r6, 0
+	bne	.L28
+.L27:
+	br	r3
+	.section .fixup, "ax"
+	ldi	r4, 0x0
+	br	r3
+99:
+	ldi	r4, 0
+	br	r3
+	.previous
+	.section __ex_table, "a"
+	.align	2
+	.word	0b ,99b
+	.word	1b ,99b
+	.previous
+
+	.align 2
+ENTRY(__copy_tofrom_user)
+	cmpi.c	r6, 0
+	mv	r10,r6
+	beq	.L32
+	ldi	r9, 0
+.L34:
+	add	r6, r5, r9
+0:	lbu	r8, [r6]
+	add	r7, r4, r9
+1:	sb	r8, [r7]
+	addi	r9, 1
+	cmp.c	r9, r10
+	bne	.L34
+.L32:
+	ldi	r4, 0
+	br	r3
+	.section .fixup, "ax"
+99:
+	sub	r4, r10, r9
+	br	r3
+	.previous
+	.section __ex_table, "a"
+	.align	2
+	.word	0b, 99b
+	.word	1b, 99b
+	.previous
+
+	.align 2
+ENTRY(__clear_user)
+	cmpi.c	r5, 0
+	beq	.L38
+	ldi	r6, 0
+	mv	r7, r6
+.L40:
+	addi	r6, 1
+0:	sb	r7, [r4]+, 1
+	cmp.c	r6, r5
+	bne	.L40
+.L38:
+	ldi	r4, 0
+	br	r3
+
+	.section .fixup, "ax"
+	br	r3
+	.previous
+	.section __ex_table, "a"
+	.align	2
+99:
+	.word	0b, 99b
+	.previous
+
+	.align	2
+ENTRY(__put_user_unknown)
+	.set volatile
+	ldi	r4, -EFAULT
+	br	r3
+
+	.align	2
+ENTRY(__get_user_unknown)
+	ldi	r5, 0
+	ldi	r4, -EFAULT
+	br	r3
diff --git a/arch/score/lib/ucmpdi2.c b/arch/score/lib/ucmpdi2.c
new file mode 100644
index 00000000000..b15241e0b07
--- /dev/null
+++ b/arch/score/lib/ucmpdi2.c
@@ -0,0 +1,38 @@
+/*
+ * arch/score/lib/ucmpdi2.c
+ *
+ * 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.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include "libgcc.h"
+
+word_type __ucmpdi2(unsigned long long a, unsigned long long b)
+{
+	const DWunion au = {.ll = a};
+	const DWunion bu = {.ll = b};
+
+	if ((unsigned int) au.s.high < (unsigned int) bu.s.high)
+		return 0;
+	else if ((unsigned int) au.s.high > (unsigned int) bu.s.high)
+		return 2;
+	if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
+		return 0;
+	else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
+		return 2;
+	return 1;
+}
+EXPORT_SYMBOL(__ucmpdi2);