1 files changed, 390 insertions, 0 deletions
diff --git a/arch/sh/lib/copy_page.S b/arch/sh/lib/copy_page.S
new file mode 100644
index 000000000..d4e9d18ce
--- /dev/null
+++ b/arch/sh/lib/copy_page.S
@@ -0,0 +1,390 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * copy_page, __copy_user_page, __copy_user implementation of SuperH
+ *
+ * Copyright (C) 2001  Niibe Yutaka & Kaz Kojima
+ * Copyright (C) 2002  Toshinobu Sugioka
+ * Copyright (C) 2006  Paul Mundt
+ */
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+/*
+ * copy_page
+ * @to: P1 address
+ * @from: P1 address
+ *
+ * void copy_page(void *to, void *from)
+ */
+
+/*
+ * r0, r1, r2, r3, r4, r5, r6, r7 --- scratch 
+ * r8 --- from + PAGE_SIZE
+ * r9 --- not used
+ * r10 --- to
+ * r11 --- from
+ */
+ENTRY(copy_page)
+	mov.l	r8,@-r15
+	mov.l	r10,@-r15
+	mov.l	r11,@-r15
+	mov	r4,r10
+	mov	r5,r11
+	mov	r5,r8
+	mov	#(PAGE_SIZE >> 10), r0
+	shll8	r0
+	shll2	r0
+	add	r0,r8
+	!
+1:	mov.l	@r11+,r0
+	mov.l	@r11+,r1
+	mov.l	@r11+,r2
+	mov.l	@r11+,r3
+	mov.l	@r11+,r4
+	mov.l	@r11+,r5
+	mov.l	@r11+,r6
+	mov.l	@r11+,r7
+#if defined(CONFIG_CPU_SH4)
+	movca.l	r0,@r10
+#else
+	mov.l	r0,@r10
+#endif
+	add	#32,r10
+	mov.l	r7,@-r10
+	mov.l	r6,@-r10
+	mov.l	r5,@-r10
+	mov.l	r4,@-r10
+	mov.l	r3,@-r10
+	mov.l	r2,@-r10
+	mov.l	r1,@-r10
+	cmp/eq	r11,r8
+	bf/s	1b
+	 add	#28,r10
+	!
+	mov.l	@r15+,r11
+	mov.l	@r15+,r10
+	mov.l	@r15+,r8
+	rts
+	 nop
+
+/*
+ * __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
+ * Return the number of bytes NOT copied
+ */
+#define EX(...)			\
+	9999: __VA_ARGS__ ;		\
+	.section __ex_table, "a";	\
+	.long 9999b, 6000f	;	\
+	.previous
+#define EX_NO_POP(...)			\
+	9999: __VA_ARGS__ ;		\
+	.section __ex_table, "a";	\
+	.long 9999b, 6005f	;	\
+	.previous
+ENTRY(__copy_user)
+	! Check if small number of bytes
+	mov	#11,r0
+	mov	r4,r3
+	cmp/gt	r0,r6		! r6 (len) > r0 (11)
+	bf/s	.L_cleanup_loop_no_pop
+	 add	r6,r3		! last destination address
+
+	! Calculate bytes needed to align to src
+	mov.l	r11,@-r15
+	neg	r5,r0
+	mov.l	r10,@-r15
+	add	#4,r0
+	mov.l	r9,@-r15
+	and	#3,r0
+	mov.l	r8,@-r15
+	tst	r0,r0
+	bt	2f
+
+1:
+	! Copy bytes to long word align src
+EX(	mov.b	@r5+,r1		)
+	dt	r0
+	add	#-1,r6
+EX(	mov.b	r1,@r4		)
+	bf/s	1b
+	 add	#1,r4
+
+	! Jump to appropriate routine depending on dest
+2:	mov	#3,r1
+	mov	r6, r2
+	and	r4,r1
+	shlr2	r2
+	shll2	r1
+	mova	.L_jump_tbl,r0
+	mov.l	@(r0,r1),r1
+	jmp	@r1
+	 nop
+
+	.align 2
+.L_jump_tbl:
+	.long	.L_dest00
+	.long	.L_dest01
+	.long	.L_dest10
+	.long	.L_dest11
+
+/*
+ * Come here if there are less than 12 bytes to copy
+ *
+ * Keep the branch target close, so the bf/s callee doesn't overflow
+ * and result in a more expensive branch being inserted. This is the
+ * fast-path for small copies, the jump via the jump table will hit the
+ * default slow-path cleanup. -PFM.
+ */
+.L_cleanup_loop_no_pop:
+	tst	r6,r6		! Check explicitly for zero
+	bt	1f
+
+2:
+EX_NO_POP(	mov.b	@r5+,r0		)
+	dt	r6
+EX_NO_POP(	mov.b	r0,@r4		)
+	bf/s	2b
+	 add	#1,r4
+
+1:	mov	#0,r0		! normal return
+5000:
+
+# Exception handler:
+.section .fixup, "ax"
+6005:
+	mov.l	8000f,r1
+	mov	r3,r0
+	jmp	@r1
+	 sub	r4,r0
+	.align	2
+8000:	.long	5000b
+
+.previous
+	rts
+	 nop
+
+! Destination = 00
+
+.L_dest00:
+	! Skip the large copy for small transfers
+	mov	#(32+32-4), r0
+	cmp/gt	r6, r0		! r0 (60) > r6 (len)
+	bt	1f
+
+	! Align dest to a 32 byte boundary
+	neg	r4,r0
+	add	#0x20, r0
+	and	#0x1f, r0
+	tst	r0, r0
+	bt	2f
+
+	sub	r0, r6
+	shlr2	r0
+3:
+EX(	mov.l	@r5+,r1		)
+	dt	r0
+EX(	mov.l	r1,@r4		)
+	bf/s	3b
+	 add	#4,r4
+
+2:
+EX(	mov.l	@r5+,r0		)
+EX(	mov.l	@r5+,r1		)
+EX(	mov.l	@r5+,r2		)
+EX(	mov.l	@r5+,r7		)
+EX(	mov.l	@r5+,r8		)
+EX(	mov.l	@r5+,r9		)
+EX(	mov.l	@r5+,r10	)
+EX(	mov.l	@r5+,r11	)
+#ifdef CONFIG_CPU_SH4
+EX(	movca.l	r0,@r4		)
+#else
+EX(	mov.l	r0,@r4		)
+#endif
+	add	#-32, r6
+EX(	mov.l	r1,@(4,r4)	)
+	mov	#32, r0
+EX(	mov.l	r2,@(8,r4)	)
+	cmp/gt	r6, r0		! r0 (32) > r6 (len)
+EX(	mov.l	r7,@(12,r4)	)
+EX(	mov.l	r8,@(16,r4)	)
+EX(	mov.l	r9,@(20,r4)	)
+EX(	mov.l	r10,@(24,r4)	)
+EX(	mov.l	r11,@(28,r4)	)
+	bf/s	2b
+	 add	#32,r4
+
+1:	mov	r6, r0
+	shlr2	r0
+	tst	r0, r0
+	bt	.L_cleanup
+1:
+EX(	mov.l	@r5+,r1		)
+	dt	r0
+EX(	mov.l	r1,@r4		)
+	bf/s	1b
+	 add	#4,r4
+
+	bra	.L_cleanup
+	 nop
+
+! Destination = 10
+
+.L_dest10:
+	mov	r2,r7
+	shlr2	r7
+	shlr	r7
+	tst	r7,r7
+	mov	#7,r0
+	bt/s	1f
+	 and	r0,r2
+2:
+	dt	r7
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+EX(	mov.l	@r5+,r0		)
+EX(	mov.l	@r5+,r1		)
+EX(	mov.l	@r5+,r8		)
+EX(	mov.l	@r5+,r9		)
+EX(	mov.l	@r5+,r10	)
+EX(	mov.w	r0,@r4		)
+	add	#2,r4
+	xtrct	r1,r0
+	xtrct	r8,r1
+	xtrct	r9,r8
+	xtrct	r10,r9
+
+EX(	mov.l	r0,@r4		)
+EX(	mov.l	r1,@(4,r4)	)
+EX(	mov.l	r8,@(8,r4)	)
+EX(	mov.l	r9,@(12,r4)	)
+
+EX(	mov.l	@r5+,r1		)
+EX(	mov.l	@r5+,r8		)
+EX(	mov.l	@r5+,r0		)
+	xtrct	r1,r10
+	xtrct	r8,r1
+	xtrct	r0,r8
+	shlr16	r0
+EX(	mov.l	r10,@(16,r4)	)
+EX(	mov.l	r1,@(20,r4)	)
+EX(	mov.l	r8,@(24,r4)	)
+EX(	mov.w	r0,@(28,r4)	)
+	bf/s	2b
+	 add	#30,r4
+#else
+EX(	mov.l	@(28,r5),r0	)
+EX(	mov.l	@(24,r5),r8	)
+EX(	mov.l	@(20,r5),r9	)
+EX(	mov.l	@(16,r5),r10	)
+EX(	mov.w	r0,@(30,r4)	)
+	add	#-2,r4
+	xtrct	r8,r0
+	xtrct	r9,r8
+	xtrct	r10,r9
+EX(	mov.l	r0,@(28,r4)	)
+EX(	mov.l	r8,@(24,r4)	)
+EX(	mov.l	r9,@(20,r4)	)
+
+EX(	mov.l	@(12,r5),r0	)
+EX(	mov.l	@(8,r5),r8	)
+	xtrct	r0,r10
+EX(	mov.l	@(4,r5),r9	)
+	mov.l	r10,@(16,r4)
+EX(	mov.l	@r5,r10		)
+	xtrct	r8,r0
+	xtrct	r9,r8
+	xtrct	r10,r9
+EX(	mov.l	r0,@(12,r4)	)
+EX(	mov.l	r8,@(8,r4)	)
+	swap.w	r10,r0
+EX(	mov.l	r9,@(4,r4)	)
+EX(	mov.w	r0,@(2,r4)	)
+
+	add	#32,r5
+	bf/s	2b
+	 add	#34,r4
+#endif
+	tst	r2,r2
+	bt	.L_cleanup
+
+1:	! Read longword, write two words per iteration
+EX(	mov.l	@r5+,r0		)
+	dt	r2
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+EX(	mov.w	r0,@r4		)
+	shlr16	r0
+EX(	mov.w 	r0,@(2,r4)	)
+#else
+EX(	mov.w	r0,@(2,r4)	)
+	shlr16	r0
+EX(	mov.w	r0,@r4		)
+#endif
+	bf/s	1b
+	 add	#4,r4
+
+	bra	.L_cleanup
+	 nop
+
+! Destination = 01 or 11
+
+.L_dest01:
+.L_dest11:
+	! Read longword, write byte, word, byte per iteration
+EX(	mov.l	@r5+,r0		)
+	dt	r2
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+EX(	mov.b	r0,@r4		)
+	shlr8	r0
+	add	#1,r4
+EX(	mov.w	r0,@r4		)
+	shlr16	r0
+EX(	mov.b	r0,@(2,r4)	)
+	bf/s	.L_dest01
+	 add	#3,r4
+#else
+EX(	mov.b	r0,@(3,r4)	)
+	shlr8	r0
+	swap.w	r0,r7
+EX(	mov.b	r7,@r4		)
+	add	#1,r4
+EX(	mov.w	r0,@r4		)
+	bf/s	.L_dest01
+	 add	#3,r4
+#endif
+
+! Cleanup last few bytes
+.L_cleanup:
+	mov	r6,r0
+	and	#3,r0
+	tst	r0,r0
+	bt	.L_exit
+	mov	r0,r6
+
+.L_cleanup_loop:
+EX(	mov.b	@r5+,r0		)
+	dt	r6
+EX(	mov.b	r0,@r4		)
+	bf/s	.L_cleanup_loop
+	 add	#1,r4
+
+.L_exit:
+	mov	#0,r0		! normal return
+
+5000:
+
+# Exception handler:
+.section .fixup, "ax"
+6000:
+	mov.l	8000f,r1
+	mov	r3,r0
+	jmp	@r1
+	 sub	r4,r0
+	.align	2
+8000:	.long	5000b
+
+.previous
+	mov.l	@r15+,r8
+	mov.l	@r15+,r9
+	mov.l	@r15+,r10
+	rts
+	 mov.l	@r15+,r11