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-rw-r--r--arch/sh/mm/copy_page.S397
1 files changed, 397 insertions, 0 deletions
diff --git a/arch/sh/mm/copy_page.S b/arch/sh/mm/copy_page.S
new file mode 100644
index 000000000000..1addffe117c3
--- /dev/null
+++ b/arch/sh/mm/copy_page.S
@@ -0,0 +1,397 @@
+/* $Id: copy_page.S,v 1.8 2003/08/25 17:03:10 lethal Exp $
+ *
+ * copy_page, __copy_user_page, __copy_user implementation of SuperH
+ *
+ * Copyright (C) 2001 Niibe Yutaka & Kaz Kojima
+ * Copyright (C) 2002 Toshinobu Sugioka
+ *
+ */
+#include <linux/linkage.h>
+
+/*
+ * copy_page_slow
+ * @to: P1 address
+ * @from: P1 address
+ *
+ * void copy_page_slow(void *to, void *from)
+ */
+
+/*
+ * r0, r1, r2, r3, r4, r5, r6, r7 --- scratch
+ * r8 --- from + 4096
+ * r9 --- not used
+ * r10 --- to
+ * r11 --- from
+ */
+ENTRY(copy_page_slow)
+ mov.l r8,@-r15
+ mov.l r10,@-r15
+ mov.l r11,@-r15
+ mov r4,r10
+ mov r5,r11
+ mov r5,r8
+ mov.w .L4096,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_SH3)
+ mov.l r0,@r10
+#elif defined(CONFIG_CPU_SH4)
+ movca.l r0,@r10
+ mov r10,r0
+#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
+#if defined(CONFIG_CPU_SH4)
+ ocbwb @r0
+#endif
+ cmp/eq r11,r8
+ bf/s 1b
+ add #28,r10
+ !
+ mov.l @r15+,r11
+ mov.l @r15+,r10
+ mov.l @r15+,r8
+ rts
+ nop
+
+#if defined(CONFIG_CPU_SH4)
+/*
+ * __copy_user_page
+ * @to: P1 address (with same color)
+ * @from: P1 address
+ * @orig_to: P1 address
+ *
+ * void __copy_user_page(void *to, void *from, void *orig_to)
+ */
+
+/*
+ * r0, r1, r2, r3, r4, r5, r6, r7 --- scratch
+ * r8 --- from + 4096
+ * r9 --- orig_to
+ * r10 --- to
+ * r11 --- from
+ */
+ENTRY(__copy_user_page)
+ mov.l r8,@-r15
+ mov.l r9,@-r15
+ mov.l r10,@-r15
+ mov.l r11,@-r15
+ mov r4,r10
+ mov r5,r11
+ mov r6,r9
+ mov r5,r8
+ mov.w .L4096,r0
+ add r0,r8
+ !
+1: ocbi @r9
+ add #32,r9
+ 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
+ movca.l r0,@r10
+ mov r10,r0
+ 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
+ ocbwb @r0
+ cmp/eq r11,r8
+ bf/s 1b
+ add #28,r10
+ !
+ mov.l @r15+,r11
+ mov.l @r15+,r10
+ mov.l @r15+,r9
+ mov.l @r15+,r8
+ rts
+ nop
+#endif
+.L4096: .word 4096
+/*
+ * __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
+ENTRY(__copy_user)
+ tst r6,r6 ! Check explicitly for zero
+ bf 1f
+ rts
+ mov #0,r0 ! normal return
+1:
+ mov.l r10,@-r15
+ mov.l r9,@-r15
+ mov.l r8,@-r15
+ mov r4,r3
+ add r6,r3 ! last destination address
+ mov #12,r0 ! Check if small number of bytes
+ cmp/gt r0,r6
+ bt 2f
+ bra .L_cleanup_loop
+ nop
+2:
+ neg r5,r0 ! Calculate bytes needed to align source
+ add #4,r0
+ and #3,r0
+ tst r0,r0
+ bt .L_jump
+ mov r0,r1
+
+.L_loop1:
+ ! Copy bytes to align source
+EX( mov.b @r5+,r0 )
+ dt r1
+EX( mov.b r0,@r4 )
+ add #-1,r6
+ bf/s .L_loop1
+ add #1,r4
+
+.L_jump:
+ mov r6,r2 ! Calculate number of longwords to copy
+ shlr2 r2
+ tst r2,r2
+ bt .L_cleanup
+
+ mov r4,r0 ! Jump to appropriate routine
+ and #3,r0
+ mov r0,r1
+ 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
+
+! Destination = 00
+
+.L_dest00:
+ mov r2,r7
+ shlr2 r7
+ shlr r7
+ tst r7,r7
+ mov #7,r0
+ bt/s 1f
+ and r0,r2
+ .align 2
+2:
+EX( mov.l @r5+,r0 )
+EX( mov.l @r5+,r8 )
+EX( mov.l @r5+,r9 )
+EX( mov.l @r5+,r10 )
+EX( mov.l r0,@r4 )
+EX( mov.l r8,@(4,r4) )
+EX( mov.l r9,@(8,r4) )
+EX( mov.l r10,@(12,r4) )
+EX( mov.l @r5+,r0 )
+EX( mov.l @r5+,r8 )
+EX( mov.l @r5+,r9 )
+EX( mov.l @r5+,r10 )
+ dt r7
+EX( mov.l r0,@(16,r4) )
+EX( mov.l r8,@(20,r4) )
+EX( mov.l r9,@(24,r4) )
+EX( mov.l r10,@(28,r4) )
+ bf/s 2b
+ add #32,r4
+ tst r2,r2
+ bt .L_cleanup
+1:
+EX( mov.l @r5+,r0 )
+ dt r2
+EX( mov.l r0,@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 __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 __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 __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
+ rts
+ mov.l @r15+,r10
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