nds32: Library functions

This patch add support for various library functions.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

13 files changed, 721 insertions, 0 deletions

diff --git a/arch/nds32/include/asm/string.h b/arch/nds32/include/asm/string.h
new file mode 100644
index 000000000000..179272caa540
--- /dev/null
+++ b/arch/nds32/include/asm/string.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_STRING_H
+#define __ASM_NDS32_STRING_H
+
+#define __HAVE_ARCH_MEMCPY
+extern void *memcpy(void *, const void *, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *, const void *, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *, int, __kernel_size_t);
+
+extern void *memzero(void *ptr, __kernel_size_t n);
+#endif
diff --git a/arch/nds32/include/asm/swab.h b/arch/nds32/include/asm/swab.h
new file mode 100644
index 000000000000..e01a755a37d2
--- /dev/null
+++ b/arch/nds32/include/asm/swab.h
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_SWAB_H__
+#define __NDS32_SWAB_H__
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+        __asm__("wsbh   %0, %0\n\t"     /* word swap byte within halfword */
+                "rotri  %0, %0, #16\n"
+                :"=r"(x)
+                :"0"(x));
+        return x;
+}
+
+static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x)
+{
+        __asm__("wsbh   %0, %0\n"       /* word swap byte within halfword */
+                :"=r"(x)
+                :"0"(x));
+        return x;
+}
+
+#define __arch_swab32(x) ___arch__swab32(x)
+#define __arch_swab16(x) ___arch__swab16(x)
+
+#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
+#define __BYTEORDER_HAS_U64__
+#define __SWAB_64_THRU_32__
+#endif
+
+#endif /* __NDS32_SWAB_H__ */
diff --git a/arch/nds32/include/asm/uaccess.h b/arch/nds32/include/asm/uaccess.h
new file mode 100644
index 000000000000..18a009f3804d
--- /dev/null
+++ b/arch/nds32/include/asm/uaccess.h
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMANDES_UACCESS_H
+#define _ASMANDES_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <asm/errno.h>
+#include <asm/memory.h>
+#include <asm/types.h>
+#include <linux/mm.h>
+
+#define VERIFY_READ     0
+#define VERIFY_WRITE    1
+
+#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
+
+/*
+ * 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);
+
+#define KERNEL_DS       ((mm_segment_t) { ~0UL })
+#define USER_DS         ((mm_segment_t) {TASK_SIZE - 1})
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current_thread_info()->addr_limit)
+#define user_addr_max   get_fs
+
+static inline void set_fs(mm_segment_t fs)
+{
+        current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a, b)    ((a) == (b))
+
+#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))
+
+#define access_ok(type, addr, size)                 \
+        __range_ok((unsigned long)addr, (unsigned long)size)
+/*
+ * 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.
+ *
+ * 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,p)                                                   \
+({                                                                      \
+        long __e = -EFAULT;                                             \
+        if(likely(access_ok(VERIFY_READ,  p, sizeof(*p)))) {            \
+                __e = __get_user(x,p);                                  \
+        } else                                                          \
+                x = 0;                                                  \
+        __e;                                                            \
+})
+#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("lbi",__gu_val,__gu_addr,err);           \
+                break;                                                  \
+        case 2:                                                         \
+                __get_user_asm("lhi",__gu_val,__gu_addr,err);           \
+                break;                                                  \
+        case 4:                                                         \
+                __get_user_asm("lwi",__gu_val,__gu_addr,err);           \
+                break;                                                  \
+        case 8:                                                         \
+                __get_user_asm_dword(__gu_val,__gu_addr,err);           \
+                break;                                                  \
+        default:                                                        \
+                BUILD_BUG();                                            \
+                break;                                                  \
+        }                                                               \
+        (x) = (__typeof__(*(ptr)))__gu_val;                             \
+} while (0)
+
+#define __get_user_asm(inst,x,addr,err)                                 \
+        asm volatile(                                                   \
+        "1:     "inst"  %1,[%2]\n"                                      \
+        "2:\n"                                                          \
+        "       .section .fixup,\"ax\"\n"                               \
+        "       .align  2\n"                                            \
+        "3:     move %0, %3\n"                                          \
+        "       move %1, #0\n"                                          \
+        "       b       2b\n"                                           \
+        "       .previous\n"                                            \
+        "       .section __ex_table,\"a\"\n"                            \
+        "       .align  3\n"                                            \
+        "       .long   1b, 3b\n"                                       \
+        "       .previous"                                              \
+        : "+r" (err), "=&r" (x)                                         \
+        : "r" (addr), "i" (-EFAULT)                                     \
+        : "cc")
+
+#ifdef __NDS32_EB__
+#define __gu_reg_oper0 "%H1"
+#define __gu_reg_oper1 "%L1"
+#else
+#define __gu_reg_oper0 "%L1"
+#define __gu_reg_oper1 "%H1"
+#endif
+
+#define __get_user_asm_dword(x, addr, err)                              \
+        asm volatile(                                                   \
+        "\n1:\tlwi " __gu_reg_oper0 ",[%2]\n"                           \
+        "\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n"                         \
+        "3:\n"                                                          \
+        "       .section .fixup,\"ax\"\n"                               \
+        "       .align  2\n"                                            \
+        "4:     move    %0, %3\n"                                       \
+        "       b       3b\n"                                           \
+        "       .previous\n"                                            \
+        "       .section __ex_table,\"a\"\n"                            \
+        "       .align  3\n"                                            \
+        "       .long   1b, 4b\n"                                       \
+        "       .long   2b, 4b\n"                                       \
+        "       .previous"                                              \
+        : "+r"(err), "=&r"(x)                                           \
+        : "r"(addr), "i"(-EFAULT)                                       \
+        : "cc")
+#define put_user(x,p)                                                   \
+({                                                                      \
+        long __e = -EFAULT;                                             \
+        if(likely(access_ok(VERIFY_WRITE,  p, sizeof(*p)))) {           \
+                __e = __put_user(x,p);                                  \
+        }                                                               \
+        __e;                                                            \
+})
+#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("sbi",__pu_val,__pu_addr,err);           \
+                break;                                                  \
+        case 2:                                                         \
+                __put_user_asm("shi",__pu_val,__pu_addr,err);           \
+                break;                                                  \
+        case 4:                                                         \
+                __put_user_asm("swi",__pu_val,__pu_addr,err);           \
+                break;                                                  \
+        case 8:                                                         \
+                __put_user_asm_dword(__pu_val,__pu_addr,err);           \
+                break;                                                  \
+        default:                                                        \
+                BUILD_BUG();                                            \
+                break;                                                  \
+        }                                                               \
+} while (0)
+
+#define __put_user_asm(inst,x,addr,err)                                 \
+        asm volatile(                                                   \
+        "1:     "inst"  %1,[%2]\n"                                      \
+        "2:\n"                                                          \
+        "       .section .fixup,\"ax\"\n"                               \
+        "       .align  2\n"                                            \
+        "3:     move    %0, %3\n"                                       \
+        "       b       2b\n"                                           \
+        "       .previous\n"                                            \
+        "       .section __ex_table,\"a\"\n"                            \
+        "       .align  3\n"                                            \
+        "       .long   1b, 3b\n"                                       \
+        "       .previous"                                              \
+        : "+r" (err)                                                    \
+        : "r" (x), "r" (addr), "i" (-EFAULT)                            \
+        : "cc")
+
+#ifdef __NDS32_EB__
+#define __pu_reg_oper0 "%H2"
+#define __pu_reg_oper1 "%L2"
+#else
+#define __pu_reg_oper0 "%L2"
+#define __pu_reg_oper1 "%H2"
+#endif
+
+#define __put_user_asm_dword(x, addr, err)                              \
+        asm volatile(                                                   \
+        "\n1:\tswi " __pu_reg_oper0 ",[%1]\n"                           \
+        "\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n"                         \
+        "3:\n"                                                          \
+        "       .section .fixup,\"ax\"\n"                               \
+        "       .align  2\n"                                            \
+        "4:     move    %0, %3\n"                                       \
+        "       b       3b\n"                                           \
+        "       .previous\n"                                            \
+        "       .section __ex_table,\"a\"\n"                            \
+        "       .align  3\n"                                            \
+        "       .long   1b, 4b\n"                                       \
+        "       .long   2b, 4b\n"                                       \
+        "       .previous"                                              \
+        : "+r"(err)                                                     \
+        : "r"(addr), "r"(x), "i"(-EFAULT)                               \
+        : "cc")
+extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
+extern long strncpy_from_user(char *dest, const char __user * src, long count);
+extern __must_check long strlen_user(const char __user * str);
+extern __must_check long strnlen_user(const char __user * str, long n);
+extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
+                                           unsigned long n);
+extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
+                                         unsigned long n);
+
+#define raw_copy_from_user __arch_copy_from_user
+#define raw_copy_to_user __arch_copy_to_user
+
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+static inline unsigned long clear_user(void __user * to, unsigned long n)
+{
+        if (access_ok(VERIFY_WRITE, to, n))
+                n = __arch_clear_user(to, n);
+        return n;
+}
+
+static inline unsigned long __clear_user(void __user * to, unsigned long n)
+{
+        return __arch_clear_user(to, n);
+}
+
+#endif /* _ASMNDS32_UACCESS_H */
diff --git a/arch/nds32/kernel/nds32_ksyms.c b/arch/nds32/kernel/nds32_ksyms.c
new file mode 100644
index 000000000000..5ecebd0e60cb
--- /dev/null
+++ b/arch/nds32/kernel/nds32_ksyms.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/in6.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+#include <asm/checksum.h>
+#include <asm/io.h>
+#include <asm/ftrace.h>
+#include <asm/proc-fns.h>
+
+/* mem functions */
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(memzero);
+
+/* user mem (segment) */
+EXPORT_SYMBOL(__arch_copy_from_user);
+EXPORT_SYMBOL(__arch_copy_to_user);
+EXPORT_SYMBOL(__arch_clear_user);
+
+/* cache handling */
+EXPORT_SYMBOL(cpu_icache_inval_all);
+EXPORT_SYMBOL(cpu_dcache_wbinval_all);
+EXPORT_SYMBOL(cpu_dma_inval_range);
+EXPORT_SYMBOL(cpu_dma_wb_range);
diff --git a/arch/nds32/lib/Makefile b/arch/nds32/lib/Makefile
new file mode 100644
index 000000000000..0f9840103f03
--- /dev/null
+++ b/arch/nds32/lib/Makefile
@@ -0,0 +1,3 @@
+lib-y           := copy_page.o memcpy.o memmove.o   \
+                   memset.o memzero.o \
+                   copy_from_user.o copy_to_user.o clear_user.o
diff --git a/arch/nds32/lib/clear_user.S b/arch/nds32/lib/clear_user.S
new file mode 100644
index 000000000000..805dfcd25bf8
--- /dev/null
+++ b/arch/nds32/lib/clear_user.S
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+/* Prototype: int __arch_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
+ */
+        .text
+        .align  5
+ENTRY(__arch_clear_user)
+        add     $r5, $r0, $r1
+        beqz    $r1, clear_exit
+        xor     $p1, $p1, $p1           ! Use $p1=0 to clear mem
+        srli    $p0, $r1, #2            ! $p0 = number of word to clear
+        andi    $r1, $r1, #3            ! Bytes less than a word to copy
+        beqz    $p0, byte_clear         ! Only less than a word to clear
+word_clear:
+USER(   smw.bim,$p1, [$r0], $p1)        ! Clear the word
+        addi    $p0, $p0, #-1           ! Decrease word count
+        bnez    $p0, word_clear         ! Continue looping to clear all words
+        beqz    $r1, clear_exit         ! No left bytes to copy
+byte_clear:
+USER(   sbi.bi, $p1, [$r0], #1)         ! Clear the byte
+        addi    $r1, $r1, #-1           ! Decrease byte count
+        bnez    $r1, byte_clear         ! Continue looping to clear all left bytes
+clear_exit:
+        move    $r0, $r1                ! Set return value
+        ret
+
+        .section .fixup,"ax"
+        .align  0
+9001:
+        sub     $r0, $r5, $r0           ! Bytes left to copy
+        ret
+        .previous
+ENDPROC(__arch_clear_user)
diff --git a/arch/nds32/lib/copy_from_user.S b/arch/nds32/lib/copy_from_user.S
new file mode 100644
index 000000000000..ad1857b20067
--- /dev/null
+++ b/arch/nds32/lib/copy_from_user.S
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+.macro  lbi1 dst, addr, adj
+USER( lbi.bi, \dst, [\addr], \adj)
+.endm
+
+.macro  sbi1 src, addr, adj
+sbi.bi  \src, [\addr], \adj
+.endm
+
+.macro  lmw1 start_reg, addr, end_reg
+USER( lmw.bim, \start_reg, [\addr], \end_reg)
+.endm
+
+.macro  smw1 start_reg, addr, end_reg
+smw.bim \start_reg, [\addr], \end_reg
+.endm
+
+
+/* Prototype: int __arch_copy_from_user(void *to, const char *from, size_t n)
+ * Purpose  : copy a block from user memory to kernel memory
+ * Params   : to   - kernel memory
+ *          : from - user memory
+ *          : n    - number of bytes to copy
+ * Returns  : Number of bytes NOT copied.
+ */
+
+.text
+ENTRY(__arch_copy_from_user)
+        add     $r5, $r0, $r2
+#include "copy_template.S"
+        move    $r0, $r2
+        ret
+.section .fixup,"ax"
+.align  2
+9001:
+        sub     $r0, $r5, $r0
+        ret
+.previous
+ENDPROC(__arch_copy_from_user)
diff --git a/arch/nds32/lib/copy_template.S b/arch/nds32/lib/copy_template.S
new file mode 100644
index 000000000000..3a9a2de468c2
--- /dev/null
+++ b/arch/nds32/lib/copy_template.S
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+
+        beq     $r1, $r0, quit_memcpy
+        beqz    $r2, quit_memcpy
+        srli    $r3, $r2, #5    ! check if len < cache-line size 32
+        beqz    $r3, word_copy_entry
+        andi    $r4, $r0, #0x3  ! check byte-align
+        beqz    $r4, unalign_word_copy_entry
+
+        addi    $r4, $r4,#-4
+        abs     $r4, $r4        ! check how many un-align byte to copy
+        sub     $r2, $r2, $r4   ! update $R2
+
+unalign_byte_copy:
+        lbi1    $r3, $r1, #1
+        addi    $r4, $r4, #-1
+        sbi1    $r3, $r0, #1
+        bnez    $r4, unalign_byte_copy
+        beqz    $r2, quit_memcpy
+
+unalign_word_copy_entry:
+        andi    $r3, $r0, 0x1f  ! check cache-line unaligncount
+        beqz    $r3, cache_copy
+
+        addi    $r3, $r3, #-32
+        abs     $r3, $r3
+        sub     $r2, $r2, $r3   ! update $R2
+
+unalign_word_copy:
+        lmw1    $r4, $r1, $r4
+        addi    $r3, $r3, #-4
+        smw1    $r4, $r0, $r4
+        bnez    $r3, unalign_word_copy
+        beqz    $r2, quit_memcpy
+
+        addi    $r3, $r2, #-32  ! to check $r2< cache_line , than go to word_copy
+        bltz    $r3, word_copy_entry
+cache_copy:
+        srli    $r3, $r2, #5
+        beqz    $r3, word_copy_entry
+3:
+        lmw1    $r17, $r1, $r24
+        addi    $r3, $r3, #-1
+        smw1    $r17, $r0, $r24
+        bnez    $r3, 3b
+
+word_copy_entry:
+        andi    $r2, $r2, #31
+
+        beqz    $r2, quit_memcpy
+5:
+        srli    $r3, $r2, #2
+        beqz    $r3, byte_copy
+word_copy:
+        lmw1    $r4, $r1, $r4
+        addi    $r3, $r3, #-1
+        smw1    $r4, $r0, $r4
+        bnez    $r3, word_copy
+        andi    $r2, $r2, #3
+        beqz    $r2, quit_memcpy
+byte_copy:
+        lbi1    $r3, $r1, #1
+        addi    $r2, $r2, #-1
+
+        sbi1    $r3, $r0, #1
+        bnez    $r2, byte_copy
+quit_memcpy:
diff --git a/arch/nds32/lib/copy_to_user.S b/arch/nds32/lib/copy_to_user.S
new file mode 100644
index 000000000000..3230044dcfb8
--- /dev/null
+++ b/arch/nds32/lib/copy_to_user.S
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+.macro  lbi1 dst, addr, adj
+lbi.bi  \dst, [\addr], \adj
+.endm
+
+.macro  sbi1 src, addr, adj
+USER( sbi.bi, \src, [\addr], \adj)
+.endm
+
+.macro  lmw1 start_reg, addr, end_reg
+lmw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.macro  smw1 start_reg, addr, end_reg
+USER( smw.bim, \start_reg, [\addr], \end_reg)
+.endm
+
+
+/* Prototype: int __arch_copy_to_user(void *to, const char *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
+ * Returns  : Number of bytes NOT copied.
+ */
+
+.text
+ENTRY(__arch_copy_to_user)
+        add     $r5, $r0, $r2
+#include "copy_template.S"
+        move    $r0, $r2
+        ret
+.section .fixup,"ax"
+.align  2
+9001:
+        sub     $r0, $r5, $r0
+        ret
+.previous
+ENDPROC(__arch_copy_to_user)
diff --git a/arch/nds32/lib/memcpy.S b/arch/nds32/lib/memcpy.S
new file mode 100644
index 000000000000..a2345ea721e4
--- /dev/null
+++ b/arch/nds32/lib/memcpy.S
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+
+.macro  lbi1 dst, addr, adj
+lbi.bi  \dst, [\addr], \adj
+.endm
+
+.macro  sbi1 src, addr, adj
+sbi.bi  \src, [\addr], \adj
+.endm
+
+.macro  lmw1 start_reg, addr, end_reg
+lmw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.macro  smw1 start_reg, addr, end_reg
+smw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.text
+ENTRY(memcpy)
+        move    $r5, $r0
+#include "copy_template.S"
+        move    $r0, $r5
+        ret
+
+ENDPROC(memcpy)
diff --git a/arch/nds32/lib/memmove.S b/arch/nds32/lib/memmove.S
new file mode 100644
index 000000000000..c823aada2271
--- /dev/null
+++ b/arch/nds32/lib/memmove.S
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+/*
+  void *memmove(void *dst, const void *src, int n);
+
+  dst: $r0
+  src: $r1
+  n  : $r2
+  ret: $r0 - pointer to the memory area dst.
+*/
+        .text
+
+ENTRY(memmove)
+        move    $r5, $r0                ! Set return value = det
+        beq     $r0, $r1, exit_memcpy   ! Exit when det = src
+        beqz    $r2, exit_memcpy        ! Exit when n = 0
+        pushm   $t0, $t1                ! Save reg
+        srli    $p1, $r2, #2            ! $p1 is how many words to copy
+
+        ! Avoid data lost when memory overlap
+        ! Copy data reversely when src < dst
+        slt     $p0, $r0, $r1           ! check if $r0 < $r1
+        beqz    $p0, do_reverse         ! branch if dst > src
+
+        ! No reverse, dst < src
+        andi    $r2, $r2, #3            ! How many bytes are less than a word
+        li      $t0, #1                 ! Determining copy direction in byte_cpy
+        beqz    $p1, byte_cpy           ! When n is less than a word
+
+word_cpy:
+        lmw.bim $p0, [$r1], $p0         ! Read a word from src
+        addi    $p1, $p1, #-1           ! How many words left to copy
+        smw.bim $p0, [$r0], $p0         ! Copy the word to det
+        bnez    $p1, word_cpy           ! If remained words > 0
+        beqz    $r2, end_memcpy         ! No left bytes to copy
+        b       byte_cpy
+
+do_reverse:
+        add     $r0, $r0, $r2           ! Start with the end of $r0
+        add     $r1, $r1, $r2           ! Start with the end of $r1
+        andi    $r2, $r2, #3            ! How many bytes are less than a word
+        li      $t0, #-1                ! Determining copy direction in byte_cpy
+        beqz    $p1, reverse_byte_cpy   ! When n is less than a word
+
+reverse_word_cpy:
+        lmw.adm $p0, [$r1], $p0         ! Read a word from src
+        addi    $p1, $p1, #-1           ! How many words left to copy
+        smw.adm $p0, [$r0], $p0         ! Copy the word to det
+        bnez    $p1, reverse_word_cpy   ! If remained words > 0
+        beqz    $r2, end_memcpy         ! No left bytes to copy
+
+reverse_byte_cpy:
+        addi    $r0, $r0, #-1
+        addi    $r1, $r1, #-1
+byte_cpy:                               ! Less than 4 bytes to copy now
+        lb.bi   $p0, [$r1], $t0         ! Read a byte from src
+        addi    $r2, $r2, #-1           ! How many bytes left to copy
+        sb.bi   $p0, [$r0], $t0         ! copy the byte to det
+        bnez    $r2, byte_cpy           ! If remained bytes > 0
+
+end_memcpy:
+        popm    $t0, $t1
+exit_memcpy:
+        move    $r0, $r5
+        ret
+
+ENDPROC(memmove)
diff --git a/arch/nds32/lib/memset.S b/arch/nds32/lib/memset.S
new file mode 100644
index 000000000000..193cb6ce21a9
--- /dev/null
+++ b/arch/nds32/lib/memset.S
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+        .text
+ENTRY(memset)
+        move    $r5, $r0                ! Return value
+        beqz    $r2, end_memset         ! Exit when len = 0
+        srli    $p1, $r2, 2             ! $p1 is how many words to copy
+        andi    $r2, $r2, 3             ! How many bytes are less than a word
+        beqz    $p1, byte_set           ! When n is less than a word
+
+        ! set $r1 from ??????ab to abababab
+        andi    $r1, $r1, #0x00ff       ! $r1 = 000000ab
+        slli    $p0, $r1, #8            ! $p0 = 0000ab00
+        or      $r1, $r1, $p0           ! $r1 = 0000abab
+        slli    $p0, $r1, #16           ! $p0 = abab0000
+        or      $r1, $r1, $p0           ! $r1 = abababab
+word_set:
+        addi    $p1, $p1, #-1           ! How many words left to copy
+        smw.bim $r1, [$r0], $r1         ! Copy the word to det
+        bnez    $p1, word_set           ! Still words to set, continue looping
+        beqz    $r2, end_memset         ! No left byte to set
+byte_set:                               ! Less than 4 bytes left to set
+        addi    $r2, $r2, #-1           ! Decrease len by 1
+        sbi.bi  $r1, [$r0], #1          ! Set data of the next byte to $r1
+        bnez    $r2, byte_set           ! Still bytes left to set
+end_memset:
+        move    $r0, $r5
+        ret
+
+ENDPROC(memset)
diff --git a/arch/nds32/lib/memzero.S b/arch/nds32/lib/memzero.S
new file mode 100644
index 000000000000..f055972c9343
--- /dev/null
+++ b/arch/nds32/lib/memzero.S
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+        .text
+ENTRY(memzero)
+        beqz    $r1, 1f
+        push    $lp
+        move    $r2, $r1
+        move    $r1, #0
+        push    $r0
+        bal     memset
+        pop     $r0
+        pop     $lp
+1:
+        ret
+ENDPROC(memzero)