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Date: Mon, 3 Jan 2011 19:53:19 +0800
From: "Guan Xuetao" <guanxuetao@...c.pku.edu.cn>
To: <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCHv1 6/8] unicore32 additional architecture files: low-level lib: uaccess
From: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
Patch 6 implements low-level uaccess libraries. And using asm-generic version uaccess.h
is in my hot TODO list.
Signed-off-by: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
---
arch/unicore32/include/asm/uaccess.h | 429 ++++++++++++++++++++++++++++++++
arch/unicore32/lib/clear_user.S | 59 +++++
arch/unicore32/lib/copy_from_user.S | 107 ++++++++
arch/unicore32/lib/copy_page.S | 39 +++
arch/unicore32/lib/copy_template.S | 214 ++++++++++++++++
arch/unicore32/lib/copy_to_user.S | 97 +++++++
arch/unicore32/lib/getuser.S | 65 +++++
arch/unicore32/lib/putuser.S | 73 ++++++
arch/unicore32/lib/strncpy_from_user.S | 45 ++++
arch/unicore32/lib/strnlen_user.S | 42 +++
10 files changed, 1170 insertions(+), 0 deletions(-)
diff --git a/arch/unicore32/include/asm/uaccess.h b/arch/unicore32/include/asm/uaccess.h
new file mode 100644
index 0000000..9f03b7d
--- /dev/null
+++ b/arch/unicore32/include/asm/uaccess.h
@@ -0,0 +1,429 @@
+/*
+ * 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__
+
+/*
+ * User space memory access functions
+ */
+#include <linux/string.h>
+#include <linux/thread_info.h>
+#include <linux/errno.h>
+
+#include <asm/memory.h>
+#include <asm/system.h>
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue. No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path. This means when everything is well,
+ * we don't even have to jump over them. Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry {
+ unsigned long insn, fixup;
+};
+
+extern int fixup_exception(struct pt_regs *regs);
+
+/*
+ * These two are intentionally not defined anywhere - if the kernel
+ * code generates any references to them, that's a bug.
+ */
+extern int __get_user_bad(void);
+extern int __put_user_bad(void);
+
+/*
+ * Note that this is actually 0x1,0000,0000
+ */
+#define KERNEL_DS 0x00000000
+#define get_ds() (KERNEL_DS)
+
+#define USER_DS TASK_SIZE
+#define get_fs() (current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+ current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a, b) ((a) == (b))
+
+#define __addr_ok(addr) ({ \
+ unsigned long flag; \
+ __asm__("cmpsub.a %2, %0; cmovub %0, #0" \
+ : "=&r" (flag) \
+ : "0" (current_thread_info()->addr_limit), "r" (addr) \
+ : "cc"); \
+ (flag == 0); })
+
+/* We use 33-bit arithmetic here... */
+#define __range_ok(addr, size) ({ \
+ unsigned long flag, roksum; \
+ __chk_user_ptr(addr); \
+ __asm__("add.a %1, %2, %3;\n" \
+ "bea 1f;\n" \
+ "subc.a %1, %1, %0;\n" \
+ "1: cmovub %0, #0" \
+ : "=&r" (flag), "=&r" (roksum) \
+ : "r" (addr), "Ir" (size), \
+ "0" (current_thread_info()->addr_limit) \
+ : "cc"); \
+ flag; })
+
+/*
+ * Single-value transfer routines. They automatically use the right
+ * size if we just have the right pointer type. Note that the functions
+ * which read from user space (*get_*) need to take care not to leak
+ * kernel data even if the calling code is buggy and fails to check
+ * the return value. This means zeroing out the destination variable
+ * or buffer on error. Normally this is done out of line by the
+ * fixup code, but there are a few places where it intrudes on the
+ * main code path. When we only write to user space, there is no
+ * problem.
+ */
+extern int __get_user_1(void *);
+extern int __get_user_2(void *);
+extern int __get_user_4(void *);
+
+#define __get_user_x(__r2, __p, __e, __s, __i...) \
+ __asm__ __volatile__ ( \
+ "b.l __get_user_" #__s \
+ : "=&r" (__e), "=r" (__r2) \
+ : "0" (__p) \
+ : __i, "cc")
+
+#define get_user(x, p) \
+ ({ \
+ register const typeof(*(p)) __user *__p asm("r0") = (p);\
+ register unsigned long __r2 asm("r2"); \
+ register int __e asm("r0"); \
+ switch (sizeof(*(__p))) { \
+ case 1: \
+ __get_user_x(__r2, __p, __e, 1, "lr"); \
+ break; \
+ case 2: \
+ __get_user_x(__r2, __p, __e, 2, "r3", "lr"); \
+ break; \
+ case 4: \
+ __get_user_x(__r2, __p, __e, 4, "lr"); \
+ break; \
+ default: \
+ __e = __get_user_bad(); \
+ break; \
+ } \
+ x = (typeof(*(p))) __r2; \
+ __e; \
+ })
+
+extern int __put_user_1(void *, unsigned int);
+extern int __put_user_2(void *, unsigned int);
+extern int __put_user_4(void *, unsigned int);
+extern int __put_user_8(void *, unsigned long long);
+
+#define __put_user_x(__r2, __p, __e, __s) \
+ __asm__ __volatile__ ( \
+ "b.l __put_user_" #__s \
+ : "=&r" (__e) \
+ : "0" (__p), "r" (__r2) \
+ : "ip", "lr", "cc")
+
+#define put_user(x, p) \
+ ({ \
+ register const typeof(*(p)) __r2 asm("r2") = (x); \
+ register const typeof(*(p)) __user *__p asm("r0") = (p);\
+ register int __e asm("r0"); \
+ switch (sizeof(*(__p))) { \
+ case 1: \
+ __put_user_x(__r2, __p, __e, 1); \
+ break; \
+ case 2: \
+ __put_user_x(__r2, __p, __e, 2); \
+ break; \
+ case 4: \
+ __put_user_x(__r2, __p, __e, 4); \
+ break; \
+ case 8: \
+ __put_user_x(__r2, __p, __e, 8); \
+ break; \
+ default: \
+ __e = __put_user_bad(); \
+ break; \
+ } \
+ __e; \
+ })
+
+#define access_ok(type, addr, size) (__range_ok(addr, size) == 0)
+
+/*
+ * The "__xxx" versions of the user access functions do not verify the
+ * address space - it must have been done previously with a separate
+ * "access_ok()" call.
+ *
+ * The "xxx_error" versions set the third argument to EFAULT if an
+ * error occurs, and leave it unchanged on success. Note that these
+ * versions are void (ie, don't return a value as such).
+ */
+#define __get_user(x, ptr) \
+({ \
+ long __gu_err = 0; \
+ __get_user_err((x), (ptr), __gu_err); \
+ __gu_err; \
+})
+
+#define __get_user_error(x, ptr, err) \
+({ \
+ __get_user_err((x), (ptr), err); \
+ (void) 0; \
+})
+
+#define __get_user_err(x, ptr, err) \
+do { \
+ unsigned long __gu_addr = (unsigned long)(ptr); \
+ unsigned long __gu_val; \
+ __chk_user_ptr(ptr); \
+ switch (sizeof(*(ptr))) { \
+ case 1: \
+ __get_user_asm_byte(__gu_val, __gu_addr, err); \
+ break; \
+ case 2: \
+ __get_user_asm_half(__gu_val, __gu_addr, err); \
+ break; \
+ case 4: \
+ __get_user_asm_word(__gu_val, __gu_addr, err); \
+ break; \
+ default: \
+ (__gu_val) = __get_user_bad(); \
+ } \
+ (x) = (__typeof__(*(ptr)))__gu_val; \
+} while (0)
+
+#define __get_user_asm_byte(x, addr, err) \
+ __asm__ __volatile__( \
+ "1: ldb.u %1,[%2]\n" \
+ "2:\n" \
+ " .pushsection .fixup,\"ax\"\n" \
+ " .align 2\n" \
+ "3: mov %0, %3\n" \
+ " mov %1, #0\n" \
+ " b 2b\n" \
+ " .popsection\n" \
+ " .pushsection __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 1b, 3b\n" \
+ " .popsection" \
+ : "+r" (err), "=&r" (x) \
+ : "r" (addr), "i" (-EFAULT) \
+ : "cc")
+
+#define __get_user_asm_half(x, __gu_addr, err) \
+({ \
+ unsigned long __b1, __b2; \
+ __get_user_asm_byte(__b1, __gu_addr, err); \
+ __get_user_asm_byte(__b2, __gu_addr + 1, err); \
+ (x) = __b1 | (__b2 << 8); \
+})
+
+#define __get_user_asm_word(x, addr, err) \
+ __asm__ __volatile__( \
+ "1: ldw.u %1,[%2]\n" \
+ "2:\n" \
+ " .pushsection .fixup,\"ax\"\n" \
+ " .align 2\n" \
+ "3: mov %0, %3\n" \
+ " mov %1, #0\n" \
+ " b 2b\n" \
+ " .popsection\n" \
+ " .pushsection __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 1b, 3b\n" \
+ " .popsection" \
+ : "+r" (err), "=&r" (x) \
+ : "r" (addr), "i" (-EFAULT) \
+ : "cc")
+
+#define __put_user(x, ptr) \
+({ \
+ long __pu_err = 0; \
+ __put_user_err((x), (ptr), __pu_err); \
+ __pu_err; \
+})
+
+#define __put_user_error(x, ptr, err) \
+({ \
+ __put_user_err((x), (ptr), err); \
+ (void) 0; \
+})
+
+#define __put_user_err(x, ptr, err) \
+do { \
+ unsigned long __pu_addr = (unsigned long)(ptr); \
+ __typeof__(*(ptr)) __pu_val = (x); \
+ __chk_user_ptr(ptr); \
+ switch (sizeof(*(ptr))) { \
+ case 1: \
+ __put_user_asm_byte(__pu_val, __pu_addr, err); \
+ break; \
+ case 2: \
+ __put_user_asm_half(__pu_val, __pu_addr, err); \
+ break; \
+ case 4: \
+ __put_user_asm_word(__pu_val, __pu_addr, err); \
+ break; \
+ case 8: \
+ __put_user_asm_dword(__pu_val, __pu_addr, err); \
+ break; \
+ default: \
+ __put_user_bad(); \
+ } \
+} while (0)
+
+#define __put_user_asm_byte(x, __pu_addr, err) \
+ __asm__ __volatile__( \
+ "1: stb.u %1,[%2]\n" \
+ "2:\n" \
+ " .pushsection .fixup,\"ax\"\n" \
+ " .align 2\n" \
+ "3: mov %0, %3\n" \
+ " b 2b\n" \
+ " .popsection\n" \
+ " .pushsection __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 1b, 3b\n" \
+ " .popsection" \
+ : "+r" (err) \
+ : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
+ : "cc")
+
+#define __put_user_asm_half(x, __pu_addr, err) \
+({ \
+ unsigned long __temp = (unsigned long)(x); \
+ __put_user_asm_byte(__temp, __pu_addr, err); \
+ __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
+})
+
+#define __put_user_asm_word(x, __pu_addr, err) \
+ __asm__ __volatile__( \
+ "1: stw.u %1,[%2]\n" \
+ "2:\n" \
+ " .pushsection .fixup,\"ax\"\n" \
+ " .align 2\n" \
+ "3: mov %0, %3\n" \
+ " b 2b\n" \
+ " .popsection\n" \
+ " .pushsection __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 1b, 3b\n" \
+ " .popsection" \
+ : "+r" (err) \
+ : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
+ : "cc")
+
+#define __reg_oper0 "%R2"
+#define __reg_oper1 "%Q2"
+
+#define __put_user_asm_dword(x, __pu_addr, err) \
+ __asm__ __volatile__( \
+ "1: stw.u " __reg_oper1 ", [%1], #4\n" \
+ "2: stw.u " __reg_oper0 ", [%1]\n" \
+ "3:\n" \
+ " .pushsection .fixup,\"ax\"\n" \
+ " .align 2\n" \
+ "4: mov %0, %3\n" \
+ " b 3b\n" \
+ " .popsection\n" \
+ " .pushsection __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 1b, 4b\n" \
+ " .long 2b, 4b\n" \
+ " .popsection" \
+ : "+r" (err), "+r" (__pu_addr) \
+ : "r" (x), "i" (-EFAULT) \
+ : "cc")
+
+
+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
+__copy_to_user_std(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
+__clear_user_std(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 __must_check
+__strnlen_user(const char __user *s, long n);
+
+static inline unsigned long __must_check
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ if (access_ok(VERIFY_READ, from, n))
+ n = __copy_from_user(to, from, n);
+ else /* security hole - plug it */
+ memset(to, 0, n);
+ return n;
+}
+
+static inline unsigned long __must_check
+copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ if (access_ok(VERIFY_WRITE, to, n))
+ n = __copy_to_user(to, from, n);
+ return n;
+}
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+static inline unsigned long __must_check
+clear_user(void __user *to, unsigned long n)
+{
+ if (access_ok(VERIFY_WRITE, to, n))
+ n = __clear_user(to, n);
+ return n;
+}
+
+static inline long __must_check
+strncpy_from_user(char *dst, const char __user *src, long count)
+{
+ long res = -EFAULT;
+ if (access_ok(VERIFY_READ, src, 1))
+ res = __strncpy_from_user(dst, src, count);
+ return res;
+}
+
+#define strlen_user(s) strnlen_user(s, ~0UL >> 1)
+
+static inline long __must_check
+strnlen_user(const char __user *s, long n)
+{
+ unsigned long res = 0;
+
+ if (__addr_ok(s))
+ res = __strnlen_user(s, n);
+
+ return res;
+}
+
+#endif /* __UNICORE_UACCESS_H__ */
diff --git a/arch/unicore32/lib/clear_user.S b/arch/unicore32/lib/clear_user.S
new file mode 100644
index 0000000..a47137d
--- /dev/null
+++ b/arch/unicore32/lib/clear_user.S
@@ -0,0 +1,59 @@
+/*
+ * 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
+ */
+ENTRY(__clear_user_std)
+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)
+ENDPROC(__clear_user_std)
+
+ .pushsection .fixup,"ax"
+ .align 0
+9001: ldm.w (r0), [sp]+
+ ldm.w (pc), [sp]+
+ .popsection
+
diff --git a/arch/unicore32/lib/copy_from_user.S b/arch/unicore32/lib/copy_from_user.S
new file mode 100644
index 0000000..37a8842
--- /dev/null
+++ b/arch/unicore32/lib/copy_from_user.S
@@ -0,0 +1,107 @@
+/*
+ * 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 r1, r3, r2
+ stw r1, [sp]
+ b.l bzero
+ ldw.w r0, [sp]+, #4
+ copy_abort_end
+ .popsection
+
diff --git a/arch/unicore32/lib/copy_page.S b/arch/unicore32/lib/copy_page.S
new file mode 100644
index 0000000..3a448d7
--- /dev/null
+++ b/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)
diff --git a/arch/unicore32/lib/copy_template.S b/arch/unicore32/lib/copy_template.S
new file mode 100644
index 0000000..524287f
--- /dev/null
+++ b/arch/unicore32/lib/copy_template.S
@@ -0,0 +1,214 @@
+/*
+ * linux/arch/unicore32/lib/copy_template.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.
+ */
+
+/*
+ * Theory of operation
+ * -------------------
+ *
+ * This file provides the core code for a forward memory copy used in
+ * the implementation of memcopy(), copy_to_user() and copy_from_user().
+ *
+ * The including file must define the following accessor macros
+ * according to the need of the given function:
+ *
+ * ldr1w ptr reg abort
+ *
+ * This loads one word from 'ptr', stores it in 'reg' and increments
+ * 'ptr' to the next word. The 'abort' argument is used for fixup tables.
+ *
+ * ldr4w ptr reg1 reg2 reg3 reg4 abort
+ * ldr8w ptr, reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ *
+ * This loads four or eight words starting from 'ptr', stores them
+ * in provided registers and increments 'ptr' past those words.
+ * The'abort' argument is used for fixup tables.
+ *
+ * ldr1b ptr reg cond abort
+ *
+ * Similar to ldr1w, but it loads a byte and increments 'ptr' one byte.
+ * It also must apply the condition code if provided, otherwise the
+ * "al" condition is assumed by default.
+ *
+ * str1w ptr reg abort
+ * str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ * str1b ptr reg cond abort
+ *
+ * Same as their ldr* counterparts, but data is stored to 'ptr' location
+ * rather than being loaded.
+ *
+ * enter
+ *
+ * Preserve the provided registers on the stack plus any additional
+ * data as needed by the implementation including this code. Called
+ * upon code entry.
+ *
+ * exit
+ *
+ * Restore registers with the values previously saved with the
+ * 'preserv' macro. Called upon code termination.
+ */
+
+
+ enter
+
+ sub.a r2, r2, #4
+ bsl 8f
+ and.a ip, r0, #3
+ bne 9f
+ and.a ip, r1, #3
+ bne 10f
+
+1: sub.a r2, r2, #(28)
+ stm.w (r5 - r8), [sp-]
+ bsl 5f
+
+3:
+4: ldr8w r1, r3, r4, r5, r6, r7, r8, r10, r11, abort=20f
+ sub.a r2, r2, #32
+ str8w r0, r3, r4, r5, r6, r7, r8, r10, r11, abort=20f
+ beg 3b
+
+5: and.a ip, r2, #28
+ rsub ip, ip, #32
+ beq 7f
+ add pc, pc, ip @ C is always clear here
+ nop
+
+ ldr1w r1, r3, abort=20f
+ ldr1w r1, r4, abort=20f
+ ldr1w r1, r5, abort=20f
+ ldr1w r1, r6, abort=20f
+ ldr1w r1, r7, abort=20f
+ ldr1w r1, r8, abort=20f
+ ldr1w r1, r11, abort=20f
+
+ add pc, pc, ip
+ nop
+
+ str1w r0, r3, abort=20f
+ str1w r0, r4, abort=20f
+ str1w r0, r5, abort=20f
+ str1w r0, r6, abort=20f
+ str1w r0, r7, abort=20f
+ str1w r0, r8, abort=20f
+ str1w r0, r11, abort=20f
+
+7: ldm.w (r5 - r8), [sp]+
+
+8: mov.a r2, r2 << #31
+ ldr1b r1, r3, ne, abort=21f
+ ldr1b r1, r4, ea, abort=21f
+ ldr1b r1, r10, ea, abort=21f
+ str1b r0, r3, ne, abort=21f
+ str1b r0, r4, ea, abort=21f
+ str1b r0, r10, ea, abort=21f
+
+ exit
+
+9: rsub ip, ip, #4
+ csub.a ip, #2
+ ldr1b r1, r3, sg, abort=21f
+ ldr1b r1, r4, eg, abort=21f
+ ldr1b r1, r11, abort=21f
+ str1b r0, r3, sg, abort=21f
+ str1b r0, r4, eg, abort=21f
+ sub.a r2, r2, ip
+ str1b r0, r11, abort=21f
+ bsl 8b
+ and.a ip, r1, #3
+ beq 1b
+
+10: andn r1, r1, #3
+ csub.a ip, #2
+ ldr1w r1, r11, abort=21f
+ beq 17f
+ bsg 18f
+
+
+ .macro forward_copy_shift a b
+
+ sub.a r2, r2, #28
+ bsl 14f
+
+11: stm.w (r5 - r9), [sp-]
+
+12:
+ ldr4w r1, r4, r5, r6, r7, abort=19f
+ mov r3, r11 pull #\a
+ sub.a r2, r2, #32
+ ldr4w r1, r8, r9, r10, r11, abort=19f
+ or r3, r3, r4 push #\b
+ mov r4, r4 pull #\a
+ or r4, r4, r5 push #\b
+ mov r5, r5 pull #\a
+ or r5, r5, r6 push #\b
+ mov r6, r6 pull #\a
+ or r6, r6, r7 push #\b
+ mov r7, r7 pull #\a
+ or r7, r7, r8 push #\b
+ mov r8, r8 pull #\a
+ or r8, r8, r9 push #\b
+ mov r9, r9 pull #\a
+ or r9, r9, r10 push #\b
+ mov r10, r10 pull #\a
+ or r10, r10, r11 push #\b
+ str8w r0, r3, r4, r5, r6, r7, r8, r9, r10, , abort=19f
+ beg 12b
+
+ ldm.w (r5 - r9), [sp]+
+
+14: and.a ip, r2, #28
+ beq 16f
+
+15: mov r3, r11 pull #\a
+ ldr1w r1, r11, abort=21f
+ sub.a ip, ip, #4
+ or r3, r3, r11 push #\b
+ str1w r0, r3, abort=21f
+ bsg 15b
+
+16: sub r1, r1, #(\b / 8)
+ b 8b
+
+ .endm
+
+
+ forward_copy_shift a=8 b=24
+
+17: forward_copy_shift a=16 b=16
+
+18: forward_copy_shift a=24 b=8
+
+
+/*
+ * Abort preamble and completion macros.
+ * If a fixup handler is required then those macros must surround it.
+ * It is assumed that the fixup code will handle the private part of
+ * the exit macro.
+ */
+
+ .macro copy_abort_preamble
+19: ldm.w (r5 - r9), [sp]+
+ b 21f
+299: .word 0 @ store lr
+ @ to avoid function call in fixup
+20: ldm.w (r5 - r8), [sp]+
+21:
+ adr r1, 299b
+ stw lr, [r1]
+ .endm
+
+ .macro copy_abort_end
+ adr lr, 299b
+ ldw pc, [lr]
+ .endm
+
diff --git a/arch/unicore32/lib/copy_to_user.S b/arch/unicore32/lib/copy_to_user.S
new file mode 100644
index 0000000..d353791
--- /dev/null
+++ b/arch/unicore32/lib/copy_to_user.S
@@ -0,0 +1,97 @@
+/*
+ * linux/arch/unicore32/lib/copy_to_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_to_user(void *to, const void *from, size_t n)
+ *
+ * Purpose:
+ *
+ * copy a block to user memory from kernel memory
+ *
+ * Params:
+ *
+ * to = user memory
+ * from = kernel memory
+ * n = number of bytes to copy
+ *
+ * Return value:
+ *
+ * Number of bytes NOT copied.
+ */
+
+ .macro ldr1w ptr reg abort
+ ldw.w \reg, [\ptr]+, #4
+ .endm
+
+ .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
+ ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
+ .endm
+
+ .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+ .endm
+
+ .macro ldr1b ptr reg cond=al abort
+ notcond \cond, .+8
+ ldb.w \reg, [\ptr]+, #1
+ .endm
+
+ .macro str1w ptr reg abort
+ strusr \reg, \ptr, 4, abort=\abort
+ .endm
+
+ .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+
+ .pushsection __ex_table, "a"
+ .long 100b, \abort
+ .popsection
+ .endm
+
+ .macro str1b ptr reg cond=al abort
+ strusr \reg, \ptr, 1, \cond, abort=\abort
+ .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_to_user_std)
+WEAK(__copy_to_user)
+
+#include "copy_template.S"
+
+ENDPROC(__copy_to_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+ copy_abort_preamble
+ ldm.w (r1, r2, r3), [sp]+
+ sub r0, r0, r1
+ rsub r0, r0, r2
+ copy_abort_end
+ .popsection
+
diff --git a/arch/unicore32/lib/getuser.S b/arch/unicore32/lib/getuser.S
new file mode 100644
index 0000000..c463198
--- /dev/null
+++ b/arch/unicore32/lib/getuser.S
@@ -0,0 +1,65 @@
+/*
+ * linux/arch/unicore32/lib/getuser.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.
+ *
+ * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
+ *
+ * These functions have a non-standard call interface to make them more
+ * efficient, especially as they return an error value in addition to
+ * the "real" return value.
+ *
+ * __get_user_X
+ *
+ * Inputs: r0 contains the address
+ * Outputs: r0 is the error code
+ * r2, r3 contains the zero-extended value
+ * lr corrupted
+ *
+ * No other registers must be altered. (see <asm/uaccess.h>
+ * for specific UniCore register usage).
+ *
+ * Note that ADDR_LIMIT is either 0 or 0xc0000000.
+ * Note also that it is intended that __get_user_bad is not global.
+ */
+#include <linux/linkage.h>
+#include <asm/errno.h>
+
+ENTRY(__get_user_1)
+1: ldb.u r2, [r0]
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__get_user_1)
+
+ENTRY(__get_user_2)
+2: ldb.u r2, [r0]+, #1
+3: ldb.u r3, [r0]
+ or r2, r2, r3 << #8
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__get_user_2)
+
+ENTRY(__get_user_4)
+4: ldw.u r2, [r0]
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__get_user_4)
+
+__get_user_bad:
+ mov r2, #0
+ mov r0, #-EFAULT
+ mov pc, lr
+ENDPROC(__get_user_bad)
+
+.pushsection __ex_table, "a"
+ .long 1b, __get_user_bad
+ .long 2b, __get_user_bad
+ .long 3b, __get_user_bad
+ .long 4b, __get_user_bad
+.popsection
diff --git a/arch/unicore32/lib/putuser.S b/arch/unicore32/lib/putuser.S
new file mode 100644
index 0000000..42fe8a4
--- /dev/null
+++ b/arch/unicore32/lib/putuser.S
@@ -0,0 +1,73 @@
+/*
+ * linux/arch/unicore32/lib/putuser.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.
+ *
+ * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
+ *
+ * These functions have a non-standard call interface to make
+ * them more efficient, especially as they return an error
+ * value in addition to the "real" return value.
+ *
+ * __put_user_X
+ *
+ * Inputs: r0 contains the address
+ * r2, r3 contains the value
+ * Outputs: r0 is the error code
+ * lr corrupted
+ *
+ * No other registers must be altered. (see <asm/uaccess.h>
+ * for specific ASM register usage).
+ *
+ * Note that ADDR_LIMIT is either 0 or 0xc0000000
+ * Note also that it is intended that __put_user_bad is not global.
+ */
+#include <linux/linkage.h>
+#include <asm/errno.h>
+
+ENTRY(__put_user_1)
+1: stb.u r2, [r0]
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__put_user_1)
+
+ENTRY(__put_user_2)
+ mov ip, r2 >> #8
+2: stb.u r2, [r0]+, #1
+3: stb.u ip, [r0]
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__put_user_2)
+
+ENTRY(__put_user_4)
+4: stw.u r2, [r0]
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__put_user_4)
+
+ENTRY(__put_user_8)
+5: stw.u r2, [r0]+, #4
+6: stw.u r3, [r0]
+ mov r0, #0
+ mov pc, lr
+ENDPROC(__put_user_8)
+
+__put_user_bad:
+ mov r0, #-EFAULT
+ mov pc, lr
+ENDPROC(__put_user_bad)
+
+.pushsection __ex_table, "a"
+ .long 1b, __put_user_bad
+ .long 2b, __put_user_bad
+ .long 3b, __put_user_bad
+ .long 4b, __put_user_bad
+ .long 5b, __put_user_bad
+ .long 6b, __put_user_bad
+.popsection
diff --git a/arch/unicore32/lib/strncpy_from_user.S b/arch/unicore32/lib/strncpy_from_user.S
new file mode 100644
index 0000000..ff6c304
--- /dev/null
+++ b/arch/unicore32/lib/strncpy_from_user.S
@@ -0,0 +1,45 @@
+/*
+ * linux/arch/unicore32/lib/strncpy_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>
+#include <asm/errno.h>
+
+ .text
+ .align 5
+
+/*
+ * Copy a string from user space to kernel space.
+ * r0 = dst, r1 = src, r2 = byte length
+ * returns the number of characters copied (strlen of copied string),
+ * -EFAULT on exception, or "len" if we fill the whole buffer
+ */
+ENTRY(__strncpy_from_user)
+ mov ip, r1
+1: sub.a r2, r2, #1
+ ldrusr r3, r1, 1, ns
+ bfs 2f
+ stb.w r3, [r0]+, #1
+ cxor.a r3, #0
+ bne 1b
+ sub r1, r1, #1 @ take NUL character out of count
+2: sub r0, r1, ip
+ mov pc, lr
+ENDPROC(__strncpy_from_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+9001: mov r3, #0
+ stb r3, [r0+], #0 @ null terminate
+ mov r0, #-EFAULT
+ mov pc, lr
+ .popsection
+
diff --git a/arch/unicore32/lib/strnlen_user.S b/arch/unicore32/lib/strnlen_user.S
new file mode 100644
index 0000000..7586303
--- /dev/null
+++ b/arch/unicore32/lib/strnlen_user.S
@@ -0,0 +1,42 @@
+/*
+ * linux/arch/unicore32/lib/strnlen_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>
+#include <asm/errno.h>
+
+ .text
+ .align 5
+
+/* Prototype: unsigned long __strnlen_user(const char *str, long n)
+ * Purpose : get length of a string in user memory
+ * Params : str - address of string in user memory
+ * Returns : length of string *including terminator*
+ * or zero on exception, or n + 1 if too long
+ */
+ENTRY(__strnlen_user)
+ mov r2, r0
+1:
+ ldrusr r3, r0, 1
+ cxor.a r3, #0
+ beq 2f
+ sub.a r1, r1, #1
+ bne 1b
+ add r0, r0, #1
+2: sub r0, r0, r2
+ mov pc, lr
+ENDPROC(__strnlen_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+9001: mov r0, #0
+ mov pc, lr
+ .popsection
--
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