nios2: Memory management
This patch contains the initialisation of the memory blocks, MMU attributes and the memory map. Signed-off-by: Ley Foon Tan <lftan@altera.com>
This commit is contained in:
Ley Foon Tan
parent
771a0163c0
commit
5ccc6af5e8
16
arch/nios2/include/asm/mmu.h
Normal file
16
arch/nios2/include/asm/mmu.h
Normal file
@ -0,0 +1,16 @@
|
||||
/*
|
||||
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
|
||||
* Copyright (C) 2004 Microtronix Datacom Ltd.
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
#ifndef _ASM_NIOS2_MMU_H
|
||||
#define _ASM_NIOS2_MMU_H
|
||||
|
||||
/* Default "unsigned long" context */
|
||||
typedef unsigned long mm_context_t;
|
||||
|
||||
#endif /* _ASM_NIOS2_MMU_H */
|
||||
111
arch/nios2/include/asm/page.h
Normal file
111
arch/nios2/include/asm/page.h
Normal file
@ -0,0 +1,111 @@
|
||||
/*
|
||||
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
||||
* Copyright (C) 2004 Microtronix Datacom Ltd.
|
||||
*
|
||||
* MMU support based on asm/page.h from mips which is:
|
||||
*
|
||||
* Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
|
||||
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
#ifndef _ASM_NIOS2_PAGE_H
|
||||
#define _ASM_NIOS2_PAGE_H
|
||||
|
||||
#include <linux/pfn.h>
|
||||
#include <linux/const.h>
|
||||
|
||||
/*
|
||||
* PAGE_SHIFT determines the page size
|
||||
*/
|
||||
#define PAGE_SHIFT 12
|
||||
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
|
||||
#define PAGE_MASK (~(PAGE_SIZE - 1))
|
||||
|
||||
/*
|
||||
* PAGE_OFFSET -- the first address of the first page of memory.
|
||||
*/
|
||||
#define PAGE_OFFSET \
|
||||
(CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
/*
|
||||
* This gives the physical RAM offset.
|
||||
*/
|
||||
#define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE
|
||||
|
||||
/*
|
||||
* It's normally defined only for FLATMEM config but it's
|
||||
* used in our early mem init code for all memory models.
|
||||
* So always define it.
|
||||
*/
|
||||
#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
|
||||
|
||||
#define clear_page(page) memset((page), 0, PAGE_SIZE)
|
||||
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
|
||||
|
||||
struct page;
|
||||
|
||||
extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
|
||||
extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
|
||||
struct page *to);
|
||||
|
||||
extern unsigned long shm_align_mask;
|
||||
|
||||
/*
|
||||
* These are used to make use of C type-checking.
|
||||
*/
|
||||
typedef struct page *pgtable_t;
|
||||
typedef struct { unsigned long pte; } pte_t;
|
||||
typedef struct { unsigned long pgd; } pgd_t;
|
||||
typedef struct { unsigned long pgprot; } pgprot_t;
|
||||
|
||||
#define pte_val(x) ((x).pte)
|
||||
#define pgd_val(x) ((x).pgd)
|
||||
#define pgprot_val(x) ((x).pgprot)
|
||||
|
||||
#define __pte(x) ((pte_t) { (x) })
|
||||
#define __pgd(x) ((pgd_t) { (x) })
|
||||
#define __pgprot(x) ((pgprot_t) { (x) })
|
||||
|
||||
extern unsigned long memory_start;
|
||||
extern unsigned long memory_end;
|
||||
extern unsigned long memory_size;
|
||||
|
||||
extern struct page *mem_map;
|
||||
|
||||
#endif /* !__ASSEMBLY__ */
|
||||
|
||||
# define __pa(x) \
|
||||
((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
|
||||
# define __va(x) \
|
||||
((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
|
||||
|
||||
#define page_to_virt(page) \
|
||||
((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
|
||||
|
||||
# define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
|
||||
# define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && \
|
||||
(pfn) < max_mapnr)
|
||||
|
||||
# define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
|
||||
# define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
|
||||
|
||||
# define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
|
||||
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
||||
|
||||
# define UNCAC_ADDR(addr) \
|
||||
((void *)((unsigned)(addr) | CONFIG_NIOS2_IO_REGION_BASE))
|
||||
# define CAC_ADDR(addr) \
|
||||
((void *)(((unsigned)(addr) & ~CONFIG_NIOS2_IO_REGION_BASE) | \
|
||||
CONFIG_NIOS2_KERNEL_REGION_BASE))
|
||||
|
||||
#include <asm-generic/memory_model.h>
|
||||
|
||||
#include <asm-generic/getorder.h>
|
||||
|
||||
#endif /* _ASM_NIOS2_PAGE_H */
|
||||
231
arch/nios2/include/asm/uaccess.h
Normal file
231
arch/nios2/include/asm/uaccess.h
Normal file
@ -0,0 +1,231 @@
|
||||
/*
|
||||
* User space memory access functions for Nios II
|
||||
*
|
||||
* Copyright (C) 2010-2011, Tobias Klauser <tklauser@distanz.ch>
|
||||
* Copyright (C) 2009, Wind River Systems Inc
|
||||
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
#ifndef _ASM_NIOS2_UACCESS_H
|
||||
#define _ASM_NIOS2_UACCESS_H
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/thread_info.h>
|
||||
#include <linux/string.h>
|
||||
|
||||
#include <asm/page.h>
|
||||
|
||||
#define VERIFY_READ 0
|
||||
#define VERIFY_WRITE 1
|
||||
|
||||
/*
|
||||
* The exception table consists of pairs of addresses: the first is the
|
||||
* address of an instruction that is allowed to fault, and the second is
|
||||
* the address at which the program should continue. No registers are
|
||||
* modified, so it is entirely up to the continuation code to figure out
|
||||
* what to do.
|
||||
*
|
||||
* All the routines below use bits of fixup code that are out of line
|
||||
* with the main instruction path. This means when everything is well,
|
||||
* we don't even have to jump over them. Further, they do not intrude
|
||||
* on our cache or tlb entries.
|
||||
*/
|
||||
struct exception_table_entry {
|
||||
unsigned long insn;
|
||||
unsigned long fixup;
|
||||
};
|
||||
|
||||
extern int fixup_exception(struct pt_regs *regs);
|
||||
|
||||
/*
|
||||
* Segment stuff
|
||||
*/
|
||||
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
|
||||
#define USER_DS MAKE_MM_SEG(0x80000000UL)
|
||||
#define KERNEL_DS MAKE_MM_SEG(0)
|
||||
|
||||
#define get_ds() (KERNEL_DS)
|
||||
|
||||
#define get_fs() (current_thread_info()->addr_limit)
|
||||
#define set_fs(seg) (current_thread_info()->addr_limit = (seg))
|
||||
|
||||
#define segment_eq(a, b) ((a).seg == (b).seg)
|
||||
|
||||
#define __access_ok(addr, len) \
|
||||
(((signed long)(((long)get_fs().seg) & \
|
||||
((long)(addr) | (((long)(addr)) + (len)) | (len)))) == 0)
|
||||
|
||||
#define access_ok(type, addr, len) \
|
||||
likely(__access_ok((unsigned long)(addr), (unsigned long)(len)))
|
||||
|
||||
# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
|
||||
|
||||
/*
|
||||
* Zero Userspace
|
||||
*/
|
||||
|
||||
static inline unsigned long __must_check __clear_user(void __user *to,
|
||||
unsigned long n)
|
||||
{
|
||||
__asm__ __volatile__ (
|
||||
"1: stb zero, 0(%1)\n"
|
||||
" addi %0, %0, -1\n"
|
||||
" addi %1, %1, 1\n"
|
||||
" bne %0, zero, 1b\n"
|
||||
"2:\n"
|
||||
__EX_TABLE_SECTION
|
||||
".word 1b, 2b\n"
|
||||
".previous\n"
|
||||
: "=r" (n), "=r" (to)
|
||||
: "0" (n), "1" (to)
|
||||
);
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
static inline unsigned long __must_check clear_user(void __user *to,
|
||||
unsigned long n)
|
||||
{
|
||||
if (!access_ok(VERIFY_WRITE, to, n))
|
||||
return n;
|
||||
return __clear_user(to, n);
|
||||
}
|
||||
|
||||
extern long __copy_from_user(void *to, const void __user *from,
|
||||
unsigned long n);
|
||||
extern long __copy_to_user(void __user *to, const void *from, unsigned long n);
|
||||
|
||||
static inline long copy_from_user(void *to, const void __user *from,
|
||||
unsigned long n)
|
||||
{
|
||||
if (!access_ok(VERIFY_READ, from, n))
|
||||
return n;
|
||||
return __copy_from_user(to, from, n);
|
||||
}
|
||||
|
||||
static inline long copy_to_user(void __user *to, const void *from,
|
||||
unsigned long n)
|
||||
{
|
||||
if (!access_ok(VERIFY_WRITE, to, n))
|
||||
return n;
|
||||
return __copy_to_user(to, from, n);
|
||||
}
|
||||
|
||||
extern long strncpy_from_user(char *__to, const char __user *__from,
|
||||
long __len);
|
||||
extern long strnlen_user(const char __user *s, long n);
|
||||
|
||||
#define __copy_from_user_inatomic __copy_from_user
|
||||
#define __copy_to_user_inatomic __copy_to_user
|
||||
|
||||
/* Optimized macros */
|
||||
#define __get_user_asm(val, insn, addr, err) \
|
||||
{ \
|
||||
__asm__ __volatile__( \
|
||||
" movi %0, %3\n" \
|
||||
"1: " insn " %1, 0(%2)\n" \
|
||||
" movi %0, 0\n" \
|
||||
"2:\n" \
|
||||
" .section __ex_table,\"a\"\n" \
|
||||
" .word 1b, 2b\n" \
|
||||
" .previous" \
|
||||
: "=&r" (err), "=r" (val) \
|
||||
: "r" (addr), "i" (-EFAULT)); \
|
||||
}
|
||||
|
||||
#define __get_user_unknown(val, size, ptr, err) do { \
|
||||
err = 0; \
|
||||
if (copy_from_user(&(val), ptr, size)) { \
|
||||
err = -EFAULT; \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
#define __get_user_common(val, size, ptr, err) \
|
||||
do { \
|
||||
switch (size) { \
|
||||
case 1: \
|
||||
__get_user_asm(val, "ldbu", ptr, err); \
|
||||
break; \
|
||||
case 2: \
|
||||
__get_user_asm(val, "ldhu", ptr, err); \
|
||||
break; \
|
||||
case 4: \
|
||||
__get_user_asm(val, "ldw", ptr, err); \
|
||||
break; \
|
||||
default: \
|
||||
__get_user_unknown(val, size, ptr, err); \
|
||||
break; \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
#define __get_user(x, ptr) \
|
||||
({ \
|
||||
long __gu_err = -EFAULT; \
|
||||
const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
|
||||
unsigned long __gu_val; \
|
||||
__get_user_common(__gu_val, sizeof(*(ptr)), __gu_ptr, __gu_err);\
|
||||
(x) = (__typeof__(x))__gu_val; \
|
||||
__gu_err; \
|
||||
})
|
||||
|
||||
#define get_user(x, ptr) \
|
||||
({ \
|
||||
long __gu_err = -EFAULT; \
|
||||
const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
|
||||
unsigned long __gu_val = 0; \
|
||||
if (access_ok(VERIFY_READ, __gu_ptr, sizeof(*__gu_ptr))) \
|
||||
__get_user_common(__gu_val, sizeof(*__gu_ptr), \
|
||||
__gu_ptr, __gu_err); \
|
||||
(x) = (__typeof__(x))__gu_val; \
|
||||
__gu_err; \
|
||||
})
|
||||
|
||||
#define __put_user_asm(val, insn, ptr, err) \
|
||||
{ \
|
||||
__asm__ __volatile__( \
|
||||
" movi %0, %3\n" \
|
||||
"1: " insn " %1, 0(%2)\n" \
|
||||
" movi %0, 0\n" \
|
||||
"2:\n" \
|
||||
" .section __ex_table,\"a\"\n" \
|
||||
" .word 1b, 2b\n" \
|
||||
" .previous\n" \
|
||||
: "=&r" (err) \
|
||||
: "r" (val), "r" (ptr), "i" (-EFAULT)); \
|
||||
}
|
||||
|
||||
#define put_user(x, ptr) \
|
||||
({ \
|
||||
long __pu_err = -EFAULT; \
|
||||
__typeof__(*(ptr)) __user *__pu_ptr = (ptr); \
|
||||
__typeof__(*(ptr)) __pu_val = (__typeof(*ptr))(x); \
|
||||
if (access_ok(VERIFY_WRITE, __pu_ptr, sizeof(*__pu_ptr))) { \
|
||||
switch (sizeof(*__pu_ptr)) { \
|
||||
case 1: \
|
||||
__put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \
|
||||
break; \
|
||||
case 2: \
|
||||
__put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \
|
||||
break; \
|
||||
case 4: \
|
||||
__put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \
|
||||
break; \
|
||||
default: \
|
||||
/* XXX: This looks wrong... */ \
|
||||
__pu_err = 0; \
|
||||
if (copy_to_user(__pu_ptr, &(__pu_val), \
|
||||
sizeof(*__pu_ptr))) \
|
||||
__pu_err = -EFAULT; \
|
||||
break; \
|
||||
} \
|
||||
} \
|
||||
__pu_err; \
|
||||
})
|
||||
|
||||
#define __put_user(x, ptr) put_user(x, ptr)
|
||||
|
||||
#endif /* _ASM_NIOS2_UACCESS_H */
|
||||
142
arch/nios2/mm/init.c
Normal file
142
arch/nios2/mm/init.c
Normal file
@ -0,0 +1,142 @@
|
||||
/*
|
||||
* Copyright (C) 2013 Altera Corporation
|
||||
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
|
||||
* Copyright (C) 2009 Wind River Systems Inc
|
||||
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
|
||||
* Copyright (C) 2004 Microtronix Datacom Ltd
|
||||
*
|
||||
* based on arch/m68k/mm/init.c
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
#include <linux/signal.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/mman.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/binfmts.h>
|
||||
|
||||
#include <asm/setup.h>
|
||||
#include <asm/page.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/sections.h>
|
||||
#include <asm/tlb.h>
|
||||
#include <asm/mmu_context.h>
|
||||
#include <asm/cpuinfo.h>
|
||||
#include <asm/processor.h>
|
||||
|
||||
pgd_t *pgd_current;
|
||||
|
||||
/*
|
||||
* paging_init() continues the virtual memory environment setup which
|
||||
* was begun by the code in arch/head.S.
|
||||
* The parameters are pointers to where to stick the starting and ending
|
||||
* addresses of available kernel virtual memory.
|
||||
*/
|
||||
void __init paging_init(void)
|
||||
{
|
||||
unsigned long zones_size[MAX_NR_ZONES];
|
||||
|
||||
memset(zones_size, 0, sizeof(zones_size));
|
||||
|
||||
pagetable_init();
|
||||
pgd_current = swapper_pg_dir;
|
||||
|
||||
zones_size[ZONE_NORMAL] = max_mapnr;
|
||||
|
||||
/* pass the memory from the bootmem allocator to the main allocator */
|
||||
free_area_init(zones_size);
|
||||
|
||||
flush_dcache_range((unsigned long)empty_zero_page,
|
||||
(unsigned long)empty_zero_page + PAGE_SIZE);
|
||||
}
|
||||
|
||||
void __init mem_init(void)
|
||||
{
|
||||
unsigned long end_mem = memory_end; /* this must not include
|
||||
kernel stack at top */
|
||||
|
||||
pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
|
||||
|
||||
end_mem &= PAGE_MASK;
|
||||
high_memory = __va(end_mem);
|
||||
|
||||
/* this will put all memory onto the freelists */
|
||||
free_all_bootmem();
|
||||
mem_init_print_info(NULL);
|
||||
}
|
||||
|
||||
void __init mmu_init(void)
|
||||
{
|
||||
flush_tlb_all();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_BLK_DEV_INITRD
|
||||
void __init free_initrd_mem(unsigned long start, unsigned long end)
|
||||
{
|
||||
free_reserved_area((void *)start, (void *)end, -1, "initrd");
|
||||
}
|
||||
#endif
|
||||
|
||||
void __init_refok free_initmem(void)
|
||||
{
|
||||
free_initmem_default(-1);
|
||||
}
|
||||
|
||||
#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
|
||||
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
|
||||
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
|
||||
static struct page *kuser_page[1];
|
||||
|
||||
static int alloc_kuser_page(void)
|
||||
{
|
||||
extern char __kuser_helper_start[], __kuser_helper_end[];
|
||||
int kuser_sz = __kuser_helper_end - __kuser_helper_start;
|
||||
unsigned long vpage;
|
||||
|
||||
vpage = get_zeroed_page(GFP_ATOMIC);
|
||||
if (!vpage)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Copy kuser helpers */
|
||||
memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
|
||||
|
||||
flush_icache_range(vpage, vpage + KUSER_SIZE);
|
||||
kuser_page[0] = virt_to_page(vpage);
|
||||
|
||||
return 0;
|
||||
}
|
||||
arch_initcall(alloc_kuser_page);
|
||||
|
||||
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
|
||||
{
|
||||
struct mm_struct *mm = current->mm;
|
||||
int ret;
|
||||
|
||||
down_write(&mm->mmap_sem);
|
||||
|
||||
/* Map kuser helpers to user space address */
|
||||
ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
|
||||
VM_READ | VM_EXEC | VM_MAYREAD |
|
||||
VM_MAYEXEC, kuser_page);
|
||||
|
||||
up_write(&mm->mmap_sem);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
const char *arch_vma_name(struct vm_area_struct *vma)
|
||||
{
|
||||
return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
|
||||
}
|
||||
163
arch/nios2/mm/uaccess.c
Normal file
163
arch/nios2/mm/uaccess.c
Normal file
@ -0,0 +1,163 @@
|
||||
/*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*
|
||||
* Copyright (C) 2009, Wind River Systems Inc
|
||||
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
|
||||
*/
|
||||
|
||||
#include <linux/export.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
asm(".global __copy_from_user\n"
|
||||
" .type __copy_from_user, @function\n"
|
||||
"__copy_from_user:\n"
|
||||
" movi r2,7\n"
|
||||
" mov r3,r4\n"
|
||||
" bge r2,r6,1f\n"
|
||||
" xor r2,r4,r5\n"
|
||||
" andi r2,r2,3\n"
|
||||
" movi r7,3\n"
|
||||
" beq r2,zero,4f\n"
|
||||
"1: addi r6,r6,-1\n"
|
||||
" movi r2,-1\n"
|
||||
" beq r6,r2,3f\n"
|
||||
" mov r7,r2\n"
|
||||
"2: ldbu r2,0(r5)\n"
|
||||
" addi r6,r6,-1\n"
|
||||
" addi r5,r5,1\n"
|
||||
" stb r2,0(r3)\n"
|
||||
" addi r3,r3,1\n"
|
||||
" bne r6,r7,2b\n"
|
||||
"3:\n"
|
||||
" addi r2,r6,1\n"
|
||||
" ret\n"
|
||||
"13:mov r2,r6\n"
|
||||
" ret\n"
|
||||
"4: andi r2,r4,1\n"
|
||||
" cmpeq r2,r2,zero\n"
|
||||
" beq r2,zero,7f\n"
|
||||
"5: andi r2,r3,2\n"
|
||||
" beq r2,zero,6f\n"
|
||||
"9: ldhu r2,0(r5)\n"
|
||||
" addi r6,r6,-2\n"
|
||||
" addi r5,r5,2\n"
|
||||
" sth r2,0(r3)\n"
|
||||
" addi r3,r3,2\n"
|
||||
"6: bge r7,r6,1b\n"
|
||||
"10:ldw r2,0(r5)\n"
|
||||
" addi r6,r6,-4\n"
|
||||
" addi r5,r5,4\n"
|
||||
" stw r2,0(r3)\n"
|
||||
" addi r3,r3,4\n"
|
||||
" br 6b\n"
|
||||
"7: ldbu r2,0(r5)\n"
|
||||
" addi r6,r6,-1\n"
|
||||
" addi r5,r5,1\n"
|
||||
" addi r3,r4,1\n"
|
||||
" stb r2,0(r4)\n"
|
||||
" br 5b\n"
|
||||
".section __ex_table,\"a\"\n"
|
||||
".word 2b,3b\n"
|
||||
".word 9b,13b\n"
|
||||
".word 10b,13b\n"
|
||||
".word 7b,13b\n"
|
||||
".previous\n"
|
||||
);
|
||||
EXPORT_SYMBOL(__copy_from_user);
|
||||
|
||||
asm(
|
||||
" .global __copy_to_user\n"
|
||||
" .type __copy_to_user, @function\n"
|
||||
"__copy_to_user:\n"
|
||||
" movi r2,7\n"
|
||||
" mov r3,r4\n"
|
||||
" bge r2,r6,1f\n"
|
||||
" xor r2,r4,r5\n"
|
||||
" andi r2,r2,3\n"
|
||||
" movi r7,3\n"
|
||||
" beq r2,zero,4f\n"
|
||||
/* Bail if we try to copy zero bytes */
|
||||
"1: addi r6,r6,-1\n"
|
||||
" movi r2,-1\n"
|
||||
" beq r6,r2,3f\n"
|
||||
/* Copy byte by byte for small copies and if src^dst != 0 */
|
||||
" mov r7,r2\n"
|
||||
"2: ldbu r2,0(r5)\n"
|
||||
" addi r5,r5,1\n"
|
||||
"9: stb r2,0(r3)\n"
|
||||
" addi r6,r6,-1\n"
|
||||
" addi r3,r3,1\n"
|
||||
" bne r6,r7,2b\n"
|
||||
"3: addi r2,r6,1\n"
|
||||
" ret\n"
|
||||
"13:mov r2,r6\n"
|
||||
" ret\n"
|
||||
/* If 'to' is an odd address byte copy */
|
||||
"4: andi r2,r4,1\n"
|
||||
" cmpeq r2,r2,zero\n"
|
||||
" beq r2,zero,7f\n"
|
||||
/* If 'to' is not divideable by four copy halfwords */
|
||||
"5: andi r2,r3,2\n"
|
||||
" beq r2,zero,6f\n"
|
||||
" ldhu r2,0(r5)\n"
|
||||
" addi r5,r5,2\n"
|
||||
"10:sth r2,0(r3)\n"
|
||||
" addi r6,r6,-2\n"
|
||||
" addi r3,r3,2\n"
|
||||
/* Copy words */
|
||||
"6: bge r7,r6,1b\n"
|
||||
" ldw r2,0(r5)\n"
|
||||
" addi r5,r5,4\n"
|
||||
"11:stw r2,0(r3)\n"
|
||||
" addi r6,r6,-4\n"
|
||||
" addi r3,r3,4\n"
|
||||
" br 6b\n"
|
||||
/* Copy remaining bytes */
|
||||
"7: ldbu r2,0(r5)\n"
|
||||
" addi r5,r5,1\n"
|
||||
" addi r3,r4,1\n"
|
||||
"12: stb r2,0(r4)\n"
|
||||
" addi r6,r6,-1\n"
|
||||
" br 5b\n"
|
||||
".section __ex_table,\"a\"\n"
|
||||
".word 9b,3b\n"
|
||||
".word 10b,13b\n"
|
||||
".word 11b,13b\n"
|
||||
".word 12b,13b\n"
|
||||
".previous\n");
|
||||
EXPORT_SYMBOL(__copy_to_user);
|
||||
|
||||
long strncpy_from_user(char *__to, const char __user *__from, long __len)
|
||||
{
|
||||
int l = strnlen_user(__from, __len);
|
||||
int is_zt = 1;
|
||||
|
||||
if (l > __len) {
|
||||
is_zt = 0;
|
||||
l = __len;
|
||||
}
|
||||
|
||||
if (l == 0 || copy_from_user(__to, __from, l))
|
||||
return -EFAULT;
|
||||
|
||||
if (is_zt)
|
||||
l--;
|
||||
return l;
|
||||
}
|
||||
|
||||
long strnlen_user(const char __user *s, long n)
|
||||
{
|
||||
long i;
|
||||
|
||||
for (i = 0; i < n; i++) {
|
||||
char c;
|
||||
|
||||
if (get_user(c, s + i) == -EFAULT)
|
||||
return 0;
|
||||
if (c == 0)
|
||||
return i + 1;
|
||||
}
|
||||
return n + 1;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user