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Date: Wed, 8 Nov 2017 13:55:06 +0800
From: Greentime Hu <green.hu@...il.com>
To: greentime@...estech.com, linux-kernel@...r.kernel.org,
arnd@...db.de, linux-arch@...r.kernel.org, tglx@...utronix.de,
jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
netdev@...r.kernel.org
Cc: green.hu@...il.com, Vincent Chen <vincentc@...estech.com>
Subject: [PATCH 18/31] nds32: Library functions
From: Greentime Hu <greentime@...estech.com>
Signed-off-by: Vincent Chen <vincentc@...estech.com>
Signed-off-by: Greentime Hu <greentime@...estech.com>
---
arch/nds32/include/asm/string.h | 30 +++
arch/nds32/include/asm/swab.h | 48 +++++
arch/nds32/include/asm/uaccess.h | 385 ++++++++++++++++++++++++++++++++++++++
arch/nds32/kernel/nds32_ksyms.c | 54 ++++++
arch/nds32/lib/Makefile | 4 +
arch/nds32/lib/getuser.S | 57 ++++++
arch/nds32/lib/memcpy.S | 93 +++++++++
arch/nds32/lib/memmove.S | 83 ++++++++
arch/nds32/lib/memset.S | 46 +++++
arch/nds32/lib/memzero.S | 31 +++
arch/nds32/lib/putuser.S | 53 ++++++
arch/nds32/lib/uaccess.S | 160 ++++++++++++++++
12 files changed, 1044 insertions(+)
create mode 100644 arch/nds32/include/asm/string.h
create mode 100644 arch/nds32/include/asm/swab.h
create mode 100644 arch/nds32/include/asm/uaccess.h
create mode 100644 arch/nds32/kernel/nds32_ksyms.c
create mode 100644 arch/nds32/lib/Makefile
create mode 100644 arch/nds32/lib/getuser.S
create mode 100644 arch/nds32/lib/memcpy.S
create mode 100644 arch/nds32/lib/memmove.S
create mode 100644 arch/nds32/lib/memset.S
create mode 100644 arch/nds32/lib/memzero.S
create mode 100644 arch/nds32/lib/putuser.S
create mode 100644 arch/nds32/lib/uaccess.S
diff --git a/arch/nds32/include/asm/string.h b/arch/nds32/include/asm/string.h
new file mode 100644
index 0000000..cf4d4b8
--- /dev/null
+++ b/arch/nds32/include/asm/string.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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 0000000..4815d6a
--- /dev/null
+++ b/arch/nds32/include/asm/swab.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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 0000000..b87a41a
--- /dev/null
+++ b/arch/nds32/include/asm/uaccess.h
@@ -0,0 +1,385 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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).
+ */
+
+extern int __get_user_1(void *);
+extern int __get_user_2(void *);
+extern int __get_user_4(void *);
+extern int __get_user_8(void *);
+extern int __get_user_bad(void);
+
+#define __get_user_x(__r2,__p,__e,__s,__i...) \
+ __asm__ __volatile__ ( \
+ __asmeq("%0", "$r0") __asmeq("%1", "$r2") \
+ "bal __get_user_" #__s \
+ : "=&r" (__e), "=r" (__r2) \
+ : "0" (__p) \
+ : __i, "cc")
+
+#define get_user(x,p) \
+ ({ \
+ const register typeof(*(p)) __user *__p asm("$r0") = (p);\
+ register unsigned long __r2 asm("$r2"); \
+ register int __e asm("$r0"); \
+ switch (sizeof(*(__p))) { \
+ case 1: \
+ __get_user_x(__r2, __p, __e, 1, "$lp"); \
+ break; \
+ case 2: \
+ __get_user_x(__r2, __p, __e, 2, "$lp"); \
+ break; \
+ case 4: \
+ __get_user_x(__r2, __p, __e, 4, "$lp"); \
+ break; \
+ case 8: \
+ __get_user_x(__r2, __p, __e, 8, "$r3", "$lp"); \
+ break; \
+ default: __e = __get_user_bad(); break; \
+ } \
+ x = (typeof(*(p))) __r2; \
+ __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_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: lbi %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")
+
+#ifndef __NDS32_EB__
+#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); \
+})
+#else
+#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 << 8) | __b2; \
+})
+#endif
+
+#define __get_user_asm_word(x,addr,err) \
+ __asm__ __volatile__( \
+ "1: lwi %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")
+
+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);
+extern int __put_user_bad(void);
+
+#define __put_user_x(__r2,__p,__e,__s,__i) \
+ __asm__ __volatile__ ( \
+ __asmeq("%0", "$r0") __asmeq("%2", "$r2") \
+ "bal __put_user_" #__s \
+ : "=&r" (__e) \
+ : "0" (__p), "r" (__r2) \
+ : __i, "cc")
+
+#define put_user(x,p) \
+ ({ \
+ const register typeof(*(p)) __r2 asm("$r2") = (x); \
+ const register typeof(*(p)) __user *__p asm("$r0") = (p);\
+ register int __e asm("$r0"); \
+ switch (sizeof(*(__p))) { \
+ case 1: \
+ __put_user_x(__r2, __p, __e, 1, "$lp"); \
+ break; \
+ case 2: \
+ __put_user_x(__r2, __p, __e, 2, "$lp"); \
+ break; \
+ case 4: \
+ __put_user_x(__r2, __p, __e, 4, "$lp"); \
+ break; \
+ case 8: \
+ __put_user_x(__r2, __p, __e, 8, "$lp"); \
+ break; \
+ default: __e = __put_user_bad(); break; \
+ } \
+ __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_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: sbi %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" (__pu_addr), "i" (-EFAULT) \
+ : "cc")
+
+#ifndef __NDS32_EB__
+#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); \
+})
+#else
+#define __put_user_asm_half(x,__pu_addr,err) \
+({ \
+ unsigned long __temp = (unsigned long)(x); \
+ __put_user_asm_byte(__temp >> 8, __pu_addr, err); \
+ __put_user_asm_byte(__temp, __pu_addr + 1, err); \
+})
+#endif
+
+#define __put_user_asm_word(x,__pu_addr,err) \
+ __asm__ __volatile__( \
+ "1: swi %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" (__pu_addr), "i" (-EFAULT) \
+ : "cc")
+
+#ifdef __NDS32_EB__
+#define __reg_oper0 "%H2"
+#define __reg_oper1 "%L2"
+#else
+#define __reg_oper0 "%L2"
+#define __reg_oper1 "%H2"
+#endif
+
+#define __put_user_asm_dword(x, __pu_addr, __pu_err) \
+ __asm__ __volatile__ ( \
+ "\n1:\tswi " __reg_oper0 ",[%1]\n" \
+ "\n2:\tswi " __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"(__pu_err) \
+ : "r"(__pu_addr), "r"(x), "i"(-EFAULT) \
+ : "cc")
+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);
+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);
+static inline unsigned long raw_copy_from_user(void *to,
+ const void __user * from,
+ unsigned long n)
+{
+ return __arch_copy_from_user(to, from, n);
+}
+
+static inline unsigned long raw_copy_to_user(void __user * to, const void *from,
+ unsigned long n)
+{
+ return __arch_copy_to_user(to, from, n);
+}
+
+#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 0000000..3f8f29f
--- /dev/null
+++ b/arch/nds32/kernel/nds32_ksyms.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/in6.h>
+#include <linux/syscalls.h>
+
+#include <asm/checksum.h>
+#include <asm/io.h>
+#include <asm/uaccess.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);
+
+EXPORT_SYMBOL(__get_user_1);
+EXPORT_SYMBOL(__get_user_2);
+EXPORT_SYMBOL(__get_user_4);
+EXPORT_SYMBOL(__get_user_8);
+
+EXPORT_SYMBOL(__put_user_1);
+EXPORT_SYMBOL(__put_user_2);
+EXPORT_SYMBOL(__put_user_4);
+EXPORT_SYMBOL(__put_user_8);
+
+/* 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 0000000..4c53eb8
--- /dev/null
+++ b/arch/nds32/lib/Makefile
@@ -0,0 +1,4 @@
+lib-y := copy_page.o memcpy.o memmove.o \
+ memset.o memzero.o \
+ uaccess.o getuser.o \
+ putuser.o
diff --git a/arch/nds32/lib/getuser.S b/arch/nds32/lib/getuser.S
new file mode 100644
index 0000000..d3e9108
--- /dev/null
+++ b/arch/nds32/lib/getuser.S
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+#include <linux/linkage.h>
+
+
+ENTRY(__get_user_1)
+1: lbi $r2, [$r0]
+ move $r0, #0
+ ret
+
+ENTRY(__get_user_2)
+2: lhi $r2, [$r0]
+ move $r0, #0
+ ret
+
+ENTRY(__get_user_4)
+3: lwi $r2, [$r0]
+ move $r0, #0
+ ret
+
+ENTRY(__get_user_8)
+4: lwi.bi $r2, [$r0], #4
+5: lwi $r3, [$r0]
+ move $r0, #0
+ ret
+
+__get_user_bad_8:
+ move $r3, #0
+__get_user_bad:
+ move $r2, #0
+ move $r0, #-EFAULT
+ ret
+
+.section __ex_table, "a"
+ .long 1b, __get_user_bad
+ .long 2b, __get_user_bad
+ .long 3b, __get_user_bad
+ .long 4b, __get_user_bad_8
+ .long 5b, __get_user_bad_8
+.previous
diff --git a/arch/nds32/lib/memcpy.S b/arch/nds32/lib/memcpy.S
new file mode 100644
index 0000000..e809fd6
--- /dev/null
+++ b/arch/nds32/lib/memcpy.S
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+ .text
+
+ENTRY(memcpy)
+ move $r5, $r0
+ beq $r0, $r1, 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:
+ lbi.bi $r3, [$r1], #1
+ addi $r4, $r4, #-1
+ sbi.bi $r3, [$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:
+ lmw.bim $r4, [$r1], $r4
+ addi $r3, $r3, #-4
+ smw.bim $r4, [$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
+ pushm $r6, $r13
+3:
+ lmw.bim $r6, [$r1], $r13
+ addi $r3, $r3, #-1
+ smw.bim $r6, [$r0], $r13
+ bnez $r3, 3b
+ popm $r6, $r13
+
+word_copy_entry:
+ andi $r2, $r2, #31
+
+ beqz $r2, quit_memcpy
+5:
+ srli $r3, $r2, #2
+ beqz $r3, byte_copy
+word_copy:
+ lmw.bim $r4, [$r1], $r4
+ addi $r3, $r3, #-1
+ smw.bim $r4, [$r0], $r4
+ bnez $r3, word_copy
+ andi $r2, $r2, #3
+ beqz $r2, quit_memcpy
+byte_copy:
+ lbi.bi $r3, [$r1], #1
+ addi $r2, $r2, #-1
+
+ sbi.bi $r3, [$r0], #1
+ bnez $r2, byte_copy
+quit_memcpy:
+ 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 0000000..0c54350
--- /dev/null
+++ b/arch/nds32/lib/memmove.S
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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 0000000..05ec352
--- /dev/null
+++ b/arch/nds32/lib/memset.S
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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 0000000..00c9996
--- /dev/null
+++ b/arch/nds32/lib/memzero.S
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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)
diff --git a/arch/nds32/lib/putuser.S b/arch/nds32/lib/putuser.S
new file mode 100644
index 0000000..2f8a20f
--- /dev/null
+++ b/arch/nds32/lib/putuser.S
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <asm/errno.h>
+#include <linux/linkage.h>
+
+ .text
+
+ENTRY(__put_user_1)
+1: sb $r2, [$r0]
+ move $r0, #0
+ ret
+
+ENTRY(__put_user_2)
+2: shi $r2, [$r0] ! Store input halfword
+ move $r0, #0
+ ret
+
+ENTRY(__put_user_4)
+3: sw $r2, [$r0]
+ move $r0, #0
+ ret
+
+ENTRY(__put_user_8)
+4: swi.bi $r2, [$r0], #4
+5: sw $r3, [$r0]
+ move $r0, #0
+ ret
+
+__put_user_bad:
+ move $r0, #-EFAULT
+ ret
+
+.section __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
+.previous
diff --git a/arch/nds32/lib/uaccess.S b/arch/nds32/lib/uaccess.S
new file mode 100644
index 0000000..dc2583e
--- /dev/null
+++ b/arch/nds32/lib/uaccess.S
@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+ .text
+
+/* 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.
+ */
+
+ENTRY(__arch_copy_to_user)
+ push $r0
+ push $r2
+ beqz $r2, ctu_exit
+ srli $p0, $r2, #2 ! $p0 = number of word to clear
+ andi $r2, $r2, #3 ! Bytes less than a word to copy
+ beqz $p0, byte_ctu ! Only less than a word to copy
+word_ctu:
+ lmw.bim $p1, [$r1], $p1 ! Load the next word
+USER( smw.bim,$p1, [$r0], $p1) ! Store the next word
+ addi $p0, $p0, #-1 ! Decrease word count
+ bnez $p0, word_ctu ! Continue looping to copy all words
+ beqz $r2, ctu_exit ! No left bytes to copy
+byte_ctu:
+ lbi.bi $p1, [$r1], #1 ! Load the next byte
+USER( sbi.bi, $p1, [$r0], #1) ! Store the next byte
+ addi $r2, $r2, #-1 ! Decrease byte count
+ bnez $r2, byte_ctu ! Continue looping to clear all left bytes
+ctu_exit:
+ move $r0, $r2 ! Set return value
+ pop $r2
+ pop $r2 ! Pop saved $r0 to $r2 to not corrupt return value
+ ret
+
+ .section .fixup,"ax"
+ .align 0
+9001:
+ pop $p1 ! Original $r2, n
+ pop $p0 ! Original $r0, void *to
+ sub $r1, $r0, $p0 ! Bytes copied
+ sub $r2, $p1, $r1 ! Bytes left to copy
+ push $lp
+ move $r0, $p0
+ bal memzero ! Clean up the memory
+ pop $lp
+ move $r0, $r2
+ ret
+ .previous
+ENDPROC(__arch_copy_to_user)
+
+/* Prototype: unsigned long __arch_copy_from_user(void *to,const void *from,unsigned long 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.
+ */
+
+
+ENTRY(__arch_copy_from_user)
+ push $r1
+ push $r2
+ beqz $r2, cfu_exit
+ srli $p0, $r2, #2 ! $p0 = number of word to clear
+ andi $r2, $r2, #3 ! Bytes less than a word to copy
+ beqz $p0, byte_cfu ! Only less than a word to copy
+word_cfu:
+USER( lmw.bim,$p1, [$r1], $p1) ! Load the next word
+ smw.bim $p1, [$r0], $p1 ! Store the next word
+ addi $p0, $p0, #-1 ! Decrease word count
+ bnez $p0, word_cfu ! Continue looping to copy all words
+ beqz $r2, cfu_exit ! No left bytes to copy
+byte_cfu:
+USER( lbi.bi, $p1, [$r1], #1) ! Load the next byte
+ sbi.bi $p1, [$r0], #1 ! Store the next byte
+ addi $r2, $r2, #-1 ! Decrease byte count
+ bnez $r2, byte_cfu ! Continue looping to clear all left bytes
+cfu_exit:
+ move $r0, $r2 ! Set return value
+ pop $r2
+ pop $r1
+ ret
+
+ .section .fixup,"ax"
+ .align 0
+ /*
+ * We took an exception. $r0 contains a pointer to
+ * the byte not copied.
+ */
+9001:
+ pop $p1 ! Original $r2, n
+ pop $p0 ! Original $r0, void *to
+ sub $r1, $r1, $p0 ! Bytes copied
+ sub $r2, $p1, $r1 ! Bytes left to copy
+ push $lp
+ bal memzero ! Clean up the memory
+ pop $lp
+ move $r0, $r2
+ ret
+ .previous
+ENDPROC(__arch_copy_from_user)
+
+/* 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
+ */
+ .align 5
+ENTRY(__arch_clear_user)
+ pushm $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
+ pop $r1
+ pop $r1 ! Pop saved $r0 to $r1 to not corrupt return value
+ ret
+
+ .section .fixup,"ax"
+ .align 0
+9001:
+ popm $p0, $p1 ! $p0 = original $r0, *addr, $p1 = original $r1, n
+ sub $p0, $r0, $p0 ! Bytes copied
+ sub $r0, $p1, $p0 ! Bytes left to copy
+ ret
+ .previous
+ENDPROC(__arch_clear_user)
--
1.7.9.5
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