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>
This commit is contained in:
Greentime Hu
parent
7ecbac743a
commit
ace02e2bad
17
arch/nds32/include/asm/string.h
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17
arch/nds32/include/asm/string.h
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@ -0,0 +1,17 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef __ASM_NDS32_STRING_H
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#define __ASM_NDS32_STRING_H
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *, int, __kernel_size_t);
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extern void *memzero(void *ptr, __kernel_size_t n);
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#endif
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35
arch/nds32/include/asm/swab.h
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35
arch/nds32/include/asm/swab.h
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef __NDS32_SWAB_H__
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#define __NDS32_SWAB_H__
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#include <linux/types.h>
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#include <linux/compiler.h>
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static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
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{
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__asm__("wsbh %0, %0\n\t" /* word swap byte within halfword */
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"rotri %0, %0, #16\n"
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:"=r"(x)
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:"0"(x));
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return x;
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}
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static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x)
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{
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__asm__("wsbh %0, %0\n" /* word swap byte within halfword */
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:"=r"(x)
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:"0"(x));
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return x;
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}
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#define __arch_swab32(x) ___arch__swab32(x)
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#define __arch_swab16(x) ___arch__swab16(x)
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#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
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#define __BYTEORDER_HAS_U64__
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#define __SWAB_64_THRU_32__
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#endif
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#endif /* __NDS32_SWAB_H__ */
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283
arch/nds32/include/asm/uaccess.h
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283
arch/nds32/include/asm/uaccess.h
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@ -0,0 +1,283 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef _ASMANDES_UACCESS_H
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#define _ASMANDES_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/sched.h>
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#include <asm/errno.h>
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#include <asm/memory.h>
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#include <asm/types.h>
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#include <linux/mm.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry {
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unsigned long insn, fixup;
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};
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extern int fixup_exception(struct pt_regs *regs);
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#define KERNEL_DS ((mm_segment_t) { ~0UL })
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#define USER_DS ((mm_segment_t) {TASK_SIZE - 1})
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current_thread_info()->addr_limit)
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#define user_addr_max get_fs
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static inline void set_fs(mm_segment_t fs)
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{
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current_thread_info()->addr_limit = fs;
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}
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#define segment_eq(a, b) ((a) == (b))
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#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))
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#define access_ok(type, addr, size) \
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__range_ok((unsigned long)addr, (unsigned long)size)
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/*
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* Single-value transfer routines. They automatically use the right
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* size if we just have the right pointer type. Note that the functions
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* which read from user space (*get_*) need to take care not to leak
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* kernel data even if the calling code is buggy and fails to check
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* the return value. This means zeroing out the destination variable
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* or buffer on error. Normally this is done out of line by the
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* fixup code, but there are a few places where it intrudes on the
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* main code path. When we only write to user space, there is no
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* problem.
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*
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* The "__xxx" versions of the user access functions do not verify the
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* address space - it must have been done previously with a separate
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* "access_ok()" call.
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*
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* The "xxx_error" versions set the third argument to EFAULT if an
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* error occurs, and leave it unchanged on success. Note that these
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* versions are void (ie, don't return a value as such).
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*/
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#define get_user(x,p) \
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({ \
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long __e = -EFAULT; \
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if(likely(access_ok(VERIFY_READ, p, sizeof(*p)))) { \
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__e = __get_user(x,p); \
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} else \
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x = 0; \
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__e; \
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})
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#define __get_user(x,ptr) \
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({ \
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long __gu_err = 0; \
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__get_user_err((x),(ptr),__gu_err); \
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__gu_err; \
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})
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#define __get_user_error(x,ptr,err) \
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({ \
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__get_user_err((x),(ptr),err); \
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(void) 0; \
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})
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#define __get_user_err(x,ptr,err) \
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do { \
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unsigned long __gu_addr = (unsigned long)(ptr); \
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unsigned long __gu_val; \
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm("lbi",__gu_val,__gu_addr,err); \
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break; \
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case 2: \
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__get_user_asm("lhi",__gu_val,__gu_addr,err); \
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break; \
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case 4: \
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__get_user_asm("lwi",__gu_val,__gu_addr,err); \
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break; \
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case 8: \
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__get_user_asm_dword(__gu_val,__gu_addr,err); \
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break; \
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default: \
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BUILD_BUG(); \
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break; \
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} \
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(x) = (__typeof__(*(ptr)))__gu_val; \
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} while (0)
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#define __get_user_asm(inst,x,addr,err) \
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asm volatile( \
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"1: "inst" %1,[%2]\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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" .align 2\n" \
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"3: move %0, %3\n" \
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" move %1, #0\n" \
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" b 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 3\n" \
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" .long 1b, 3b\n" \
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" .previous" \
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: "+r" (err), "=&r" (x) \
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: "r" (addr), "i" (-EFAULT) \
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: "cc")
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#ifdef __NDS32_EB__
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#define __gu_reg_oper0 "%H1"
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#define __gu_reg_oper1 "%L1"
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#else
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#define __gu_reg_oper0 "%L1"
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#define __gu_reg_oper1 "%H1"
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#endif
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#define __get_user_asm_dword(x, addr, err) \
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asm volatile( \
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"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \
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"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \
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"3:\n" \
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" .section .fixup,\"ax\"\n" \
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" .align 2\n" \
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"4: move %0, %3\n" \
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" b 3b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 3\n" \
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" .long 1b, 4b\n" \
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" .long 2b, 4b\n" \
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" .previous" \
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: "+r"(err), "=&r"(x) \
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: "r"(addr), "i"(-EFAULT) \
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: "cc")
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#define put_user(x,p) \
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({ \
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long __e = -EFAULT; \
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if(likely(access_ok(VERIFY_WRITE, p, sizeof(*p)))) { \
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__e = __put_user(x,p); \
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} \
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__e; \
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})
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#define __put_user(x,ptr) \
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({ \
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long __pu_err = 0; \
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__put_user_err((x),(ptr),__pu_err); \
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__pu_err; \
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})
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#define __put_user_error(x,ptr,err) \
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({ \
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__put_user_err((x),(ptr),err); \
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(void) 0; \
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})
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#define __put_user_err(x,ptr,err) \
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do { \
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unsigned long __pu_addr = (unsigned long)(ptr); \
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__typeof__(*(ptr)) __pu_val = (x); \
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__put_user_asm("sbi",__pu_val,__pu_addr,err); \
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break; \
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case 2: \
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__put_user_asm("shi",__pu_val,__pu_addr,err); \
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break; \
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case 4: \
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__put_user_asm("swi",__pu_val,__pu_addr,err); \
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break; \
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case 8: \
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__put_user_asm_dword(__pu_val,__pu_addr,err); \
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break; \
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default: \
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BUILD_BUG(); \
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break; \
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} \
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} while (0)
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#define __put_user_asm(inst,x,addr,err) \
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asm volatile( \
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"1: "inst" %1,[%2]\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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" .align 2\n" \
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"3: move %0, %3\n" \
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" b 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 3\n" \
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" .long 1b, 3b\n" \
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" .previous" \
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: "+r" (err) \
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: "r" (x), "r" (addr), "i" (-EFAULT) \
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: "cc")
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#ifdef __NDS32_EB__
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#define __pu_reg_oper0 "%H2"
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#define __pu_reg_oper1 "%L2"
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#else
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#define __pu_reg_oper0 "%L2"
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#define __pu_reg_oper1 "%H2"
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#endif
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#define __put_user_asm_dword(x, addr, err) \
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asm volatile( \
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"\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \
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"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \
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"3:\n" \
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" .section .fixup,\"ax\"\n" \
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" .align 2\n" \
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"4: move %0, %3\n" \
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" b 3b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 3\n" \
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" .long 1b, 4b\n" \
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" .long 2b, 4b\n" \
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" .previous" \
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: "+r"(err) \
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: "r"(addr), "r"(x), "i"(-EFAULT) \
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: "cc")
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extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
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extern long strncpy_from_user(char *dest, const char __user * src, long count);
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extern __must_check long strlen_user(const char __user * str);
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extern __must_check long strnlen_user(const char __user * str, long n);
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extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
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unsigned long n);
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extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
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unsigned long n);
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#define raw_copy_from_user __arch_copy_from_user
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#define raw_copy_to_user __arch_copy_to_user
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#define INLINE_COPY_FROM_USER
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#define INLINE_COPY_TO_USER
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static inline unsigned long clear_user(void __user * to, unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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n = __arch_clear_user(to, n);
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return n;
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}
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static inline unsigned long __clear_user(void __user * to, unsigned long n)
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{
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return __arch_clear_user(to, n);
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}
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#endif /* _ASMNDS32_UACCESS_H */
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31
arch/nds32/kernel/nds32_ksyms.c
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31
arch/nds32/kernel/nds32_ksyms.c
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/in6.h>
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#include <linux/syscalls.h>
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#include <linux/uaccess.h>
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#include <asm/checksum.h>
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#include <asm/io.h>
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#include <asm/ftrace.h>
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#include <asm/proc-fns.h>
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/* mem functions */
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EXPORT_SYMBOL(memset);
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EXPORT_SYMBOL(memcpy);
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EXPORT_SYMBOL(memmove);
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EXPORT_SYMBOL(memzero);
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/* user mem (segment) */
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EXPORT_SYMBOL(__arch_copy_from_user);
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EXPORT_SYMBOL(__arch_copy_to_user);
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EXPORT_SYMBOL(__arch_clear_user);
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/* cache handling */
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EXPORT_SYMBOL(cpu_icache_inval_all);
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EXPORT_SYMBOL(cpu_dcache_wbinval_all);
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EXPORT_SYMBOL(cpu_dma_inval_range);
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EXPORT_SYMBOL(cpu_dma_wb_range);
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3
arch/nds32/lib/Makefile
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3
arch/nds32/lib/Makefile
Normal file
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lib-y := copy_page.o memcpy.o memmove.o \
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memset.o memzero.o \
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copy_from_user.o copy_to_user.o clear_user.o
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42
arch/nds32/lib/clear_user.S
Normal file
42
arch/nds32/lib/clear_user.S
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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/* Prototype: int __arch_clear_user(void *addr, size_t sz)
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* Purpose : clear some user memory
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* Params : addr - user memory address to clear
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* : sz - number of bytes to clear
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* Returns : number of bytes NOT cleared
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*/
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.text
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.align 5
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ENTRY(__arch_clear_user)
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add $r5, $r0, $r1
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beqz $r1, clear_exit
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xor $p1, $p1, $p1 ! Use $p1=0 to clear mem
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srli $p0, $r1, #2 ! $p0 = number of word to clear
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andi $r1, $r1, #3 ! Bytes less than a word to copy
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beqz $p0, byte_clear ! Only less than a word to clear
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word_clear:
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USER( smw.bim,$p1, [$r0], $p1) ! Clear the word
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addi $p0, $p0, #-1 ! Decrease word count
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bnez $p0, word_clear ! Continue looping to clear all words
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beqz $r1, clear_exit ! No left bytes to copy
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byte_clear:
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USER( sbi.bi, $p1, [$r0], #1) ! Clear the byte
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addi $r1, $r1, #-1 ! Decrease byte count
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bnez $r1, byte_clear ! Continue looping to clear all left bytes
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clear_exit:
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move $r0, $r1 ! Set return value
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ret
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.section .fixup,"ax"
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.align 0
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9001:
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sub $r0, $r5, $r0 ! Bytes left to copy
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ret
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.previous
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ENDPROC(__arch_clear_user)
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45
arch/nds32/lib/copy_from_user.S
Normal file
45
arch/nds32/lib/copy_from_user.S
Normal file
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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.macro lbi1 dst, addr, adj
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USER( lbi.bi, \dst, [\addr], \adj)
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.endm
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.macro sbi1 src, addr, adj
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sbi.bi \src, [\addr], \adj
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.endm
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||||
.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)
|
||||
69
arch/nds32/lib/copy_template.S
Normal file
69
arch/nds32/lib/copy_template.S
Normal file
@ -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:
|
||||
45
arch/nds32/lib/copy_to_user.S
Normal file
45
arch/nds32/lib/copy_to_user.S
Normal file
@ -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)
|
||||
30
arch/nds32/lib/memcpy.S
Normal file
30
arch/nds32/lib/memcpy.S
Normal file
@ -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)
|
||||
70
arch/nds32/lib/memmove.S
Normal file
70
arch/nds32/lib/memmove.S
Normal file
@ -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)
|
||||
33
arch/nds32/lib/memset.S
Normal file
33
arch/nds32/lib/memset.S
Normal file
@ -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)
|
||||
18
arch/nds32/lib/memzero.S
Normal file
18
arch/nds32/lib/memzero.S
Normal file
@ -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)
|
||||
Loading…
Reference in New Issue
Block a user