unicore32 additional architecture files: low-level lib: uaccess

This patch implements low-level uaccess libraries.

Signed-off-by: Guan Xuetao <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>

arch/unicore32/include/asm/uaccess.h

@@ -0,0 +1,47 @@
+/*
+ * linux/arch/unicore32/include/asm/uaccess.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_UACCESS_H__
+#define __UNICORE_UACCESS_H__
+
+#include <linux/thread_info.h>
+#include <linux/errno.h>
+
+#include <asm/memory.h>
+#include <asm/system.h>
+
+#define __copy_from_user	__copy_from_user
+#define __copy_to_user		__copy_to_user
+#define __strncpy_from_user	__strncpy_from_user
+#define __strnlen_user		__strnlen_user
+#define __clear_user		__clear_user
+
+#define __kernel_ok		(segment_eq(get_fs(), KERNEL_DS))
+#define __user_ok(addr, size)	(((size) <= TASK_SIZE)			\
+				&& ((addr) <= TASK_SIZE - (size)))
+#define __access_ok(addr, size)	(__kernel_ok || __user_ok((addr), (size)))
+
+extern unsigned long __must_check
+__copy_from_user(void *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check
+__copy_to_user(void __user *to, const void *from, unsigned long n);
+extern unsigned long __must_check
+__clear_user(void __user *addr, unsigned long n);
+extern unsigned long __must_check
+__strncpy_from_user(char *to, const char __user *from, unsigned long count);
+extern unsigned long
+__strnlen_user(const char __user *s, long n);
+
+#include <asm-generic/uaccess.h>
+
+extern int fixup_exception(struct pt_regs *regs);
+
+#endif /* __UNICORE_UACCESS_H__ */

arch/unicore32/lib/clear_user.S

@@ -0,0 +1,57 @@
+/*
+ * linux/arch/unicore32/lib/clear_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+		.text
+
+/* Prototype: int __clear_user(void *addr, size_t sz)
+ * Purpose  : clear some user memory
+ * Params   : addr - user memory address to clear
+ *          : sz   - number of bytes to clear
+ * Returns  : number of bytes NOT cleared
+ */
+WEAK(__clear_user)
+		stm.w	(lr), [sp-]
+		stm.w	(r1), [sp-]
+		mov	r2, #0
+		csub.a	r1, #4
+		bsl	2f
+		and.a	ip, r0, #3
+		beq	1f
+		csub.a	ip, #2
+		strusr	r2, r0, 1
+		strusr	r2, r0, 1, el
+		strusr	r2, r0, 1, sl
+		rsub	ip, ip, #4
+		sub	r1, r1, ip		@  7  6  5  4  3  2  1
+1:		sub.a	r1, r1, #8		@ -1 -2 -3 -4 -5 -6 -7
+		strusr	r2, r0, 4, ns, rept=2
+		bns	1b
+		add.a	r1, r1, #4		@  3  2  1  0 -1 -2 -3
+		strusr	r2, r0, 4, ns
+2:		cand.a	r1, #2			@ 1x 1x 0x 0x 1x 1x 0x
+		strusr	r2, r0, 1, ne, rept=2
+		cand.a	r1, #1			@ x1 x0 x1 x0 x1 x0 x1
+		beq	3f
+USER(		stb.u	r2, [r0])
+3:		mov	r0, #0
+		ldm.w	(r1), [sp]+
+		ldm.w	(pc), [sp]+
+ENDPROC(__clear_user)
+
+		.pushsection .fixup,"ax"
+		.align	0
+9001:		ldm.w	(r0), [sp]+
+		ldm.w	(pc), [sp]+
+		.popsection
+

arch/unicore32/lib/copy_from_user.S

@@ -0,0 +1,108 @@
+/*
+ * linux/arch/unicore32/lib/copy_from_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Prototype:
+ *
+ *	size_t __copy_from_user(void *to, const void *from, size_t n)
+ *
+ * Purpose:
+ *
+ *	copy a block to kernel memory from user memory
+ *
+ * Params:
+ *
+ *	to = kernel memory
+ *	from = user memory
+ *	n = number of bytes to copy
+ *
+ * Return value:
+ *
+ *	Number of bytes NOT copied.
+ */
+
+	.macro ldr1w ptr reg abort
+	ldrusr	\reg, \ptr, 4, abort=\abort
+	.endm
+
+	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
+100:	ldm.w	(\reg1, \reg2, \reg3, \reg4), [\ptr]+
+	.pushsection __ex_table, "a"
+	.align	3
+	.long 100b, \abort
+	.popsection
+	.endm
+
+	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+100:	ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+	.pushsection __ex_table, "a"
+	.align	3
+	.long 100b, \abort
+	.popsection
+	.endm
+
+	.macro ldr1b ptr reg cond=al abort
+	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
+	.endm
+
+	.macro str1w ptr reg abort
+	stw.w \reg, [\ptr]+, #4
+	.endm
+
+	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+	stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+	.endm
+
+	.macro str1b ptr reg cond=al abort
+	.ifnc	\cond, al
+	b\cond	201f
+	b	202f
+	.endif
+201:	stb.w \reg, [\ptr]+, #1
+202:
+	.endm
+
+	.macro enter
+	mov	r3, #0
+	stm.w	(r0, r2, r3), [sp-]
+	.endm
+
+	.macro exit
+	add	sp, sp, #8
+	ldm.w	(r0), [sp]+
+	mov	pc, lr
+	.endm
+
+	.text
+
+ENTRY(__copy_from_user)
+
+#include "copy_template.S"
+
+ENDPROC(__copy_from_user)
+
+	.pushsection .fixup,"ax"
+	.align 0
+	copy_abort_preamble
+	ldm.w	(r1, r2), [sp]+
+	sub	r3, r0, r1
+	rsub	r2, r3, r2
+	stw	r2, [sp]
+	mov	r1, #0
+	b.l	memset
+	ldw.w	r0, [sp]+, #4
+	copy_abort_end
+	.popsection
+

arch/unicore32/lib/copy_page.S

@@ -0,0 +1,39 @@
+/*
+ * linux/arch/unicore32/lib/copy_page.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  ASM optimised string functions
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <generated/asm-offsets.h>
+#include <asm/cache.h>
+
+#define COPY_COUNT (PAGE_SZ/256)
+
+		.text
+		.align	5
+/*
+ * UniCore optimised copy_page routine
+ */
+ENTRY(copy_page)
+		stm.w	(r17 - r19, lr), [sp-]
+		mov	r17, r0
+		mov	r18, r1
+		mov	r19, #COPY_COUNT
+1:
+	.rept	4
+		ldm.w	(r0 - r15), [r18]+
+		stm.w	(r0 - r15), [r17]+
+	.endr
+		sub.a	r19, r19, #1
+		bne	1b
+		ldm.w	(r17 - r19, pc), [sp]+
+ENDPROC(copy_page)