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3 |
xianfeng |
/*
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* User address space access functions.
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* The non inlined parts of asm-i386/uaccess.h are here.
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*
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* Copyright 1997 Andi Kleen <ak@muc.de>
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* Copyright 1997 Linus Torvalds
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*/
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/blkdev.h>
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#include <linux/module.h>
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#include <linux/backing-dev.h>
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#include <linux/interrupt.h>
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#include <asm/uaccess.h>
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#include <asm/mmx.h>
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static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n)
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{
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#ifdef CONFIG_X86_INTEL_USERCOPY
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if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask))
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return 0;
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#endif
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return 1;
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}
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#define movsl_is_ok(a1,a2,n) \
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__movsl_is_ok((unsigned long)(a1),(unsigned long)(a2),(n))
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/*
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* Copy a null terminated string from userspace.
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*/
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#define __do_strncpy_from_user(dst,src,count,res) \
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do { \
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int __d0, __d1, __d2; \
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might_sleep(); \
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__asm__ __volatile__( \
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" testl %1,%1\n" \
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" jz 2f\n" \
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"0: lodsb\n" \
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" stosb\n" \
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" testb %%al,%%al\n" \
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" jz 1f\n" \
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" decl %1\n" \
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" jnz 0b\n" \
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"1: subl %1,%0\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3: movl %5,%0\n" \
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" jmp 2b\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 0b,3b\n" \
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".previous" \
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: "=d"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \
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"=&D" (__d2) \
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: "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \
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: "memory"); \
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} while (0)
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/**
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* __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
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* @dst: Destination address, in kernel space. This buffer must be at
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* least @count bytes long.
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* @src: Source address, in user space.
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* @count: Maximum number of bytes to copy, including the trailing NUL.
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*
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* Copies a NUL-terminated string from userspace to kernel space.
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* Caller must check the specified block with access_ok() before calling
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* this function.
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*
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* On success, returns the length of the string (not including the trailing
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* NUL).
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*
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* If access to userspace fails, returns -EFAULT (some data may have been
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* copied).
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*
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* If @count is smaller than the length of the string, copies @count bytes
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* and returns @count.
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*/
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long
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__strncpy_from_user(char *dst, const char __user *src, long count)
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{
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long res;
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__do_strncpy_from_user(dst, src, count, res);
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return res;
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}
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EXPORT_SYMBOL(__strncpy_from_user);
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/**
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* strncpy_from_user: - Copy a NUL terminated string from userspace.
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* @dst: Destination address, in kernel space. This buffer must be at
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* least @count bytes long.
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* @src: Source address, in user space.
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* @count: Maximum number of bytes to copy, including the trailing NUL.
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*
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* Copies a NUL-terminated string from userspace to kernel space.
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*
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* On success, returns the length of the string (not including the trailing
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* NUL).
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*
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* If access to userspace fails, returns -EFAULT (some data may have been
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* copied).
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*
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* If @count is smaller than the length of the string, copies @count bytes
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* and returns @count.
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*/
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long
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strncpy_from_user(char *dst, const char __user *src, long count)
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{
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long res = -EFAULT;
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if (access_ok(VERIFY_READ, src, 1))
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__do_strncpy_from_user(dst, src, count, res);
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return res;
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}
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EXPORT_SYMBOL(strncpy_from_user);
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/*
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* Zero Userspace
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*/
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#define __do_clear_user(addr,size) \
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do { \
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int __d0; \
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might_sleep(); \
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__asm__ __volatile__( \
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"0: rep; stosl\n" \
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" movl %2,%0\n" \
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"1: rep; stosb\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3: lea 0(%2,%0,4),%0\n" \
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" jmp 2b\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 0b,3b\n" \
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" .long 1b,2b\n" \
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".previous" \
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: "=&c"(size), "=&D" (__d0) \
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: "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
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} while (0)
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/**
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* clear_user: - Zero a block of memory in user space.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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unsigned long
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clear_user(void __user *to, unsigned long n)
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{
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might_sleep();
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if (access_ok(VERIFY_WRITE, to, n))
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__do_clear_user(to, n);
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return n;
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}
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EXPORT_SYMBOL(clear_user);
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/**
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* __clear_user: - Zero a block of memory in user space, with less checking.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space. Caller must check
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* the specified block with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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unsigned long
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__clear_user(void __user *to, unsigned long n)
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{
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__do_clear_user(to, n);
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return n;
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}
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EXPORT_SYMBOL(__clear_user);
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/**
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* strnlen_user: - Get the size of a string in user space.
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* @s: The string to measure.
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* @n: The maximum valid length
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* Returns the size of the string INCLUDING the terminating NUL.
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* On exception, returns 0.
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* If the string is too long, returns a value greater than @n.
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*/
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long strnlen_user(const char __user *s, long n)
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{
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| 196 |
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unsigned long mask = -__addr_ok(s);
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| 197 |
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unsigned long res, tmp;
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| 198 |
|
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| 199 |
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might_sleep();
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| 200 |
|
|
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| 201 |
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__asm__ __volatile__(
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| 202 |
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" testl %0, %0\n"
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| 203 |
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" jz 3f\n"
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| 204 |
|
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" andl %0,%%ecx\n"
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| 205 |
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"0: repne; scasb\n"
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| 206 |
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" setne %%al\n"
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| 207 |
|
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" subl %%ecx,%0\n"
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| 208 |
|
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" addl %0,%%eax\n"
|
| 209 |
|
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"1:\n"
|
| 210 |
|
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".section .fixup,\"ax\"\n"
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| 211 |
|
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"2: xorl %%eax,%%eax\n"
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| 212 |
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" jmp 1b\n"
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| 213 |
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"3: movb $1,%%al\n"
|
| 214 |
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" jmp 1b\n"
|
| 215 |
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".previous\n"
|
| 216 |
|
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".section __ex_table,\"a\"\n"
|
| 217 |
|
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" .align 4\n"
|
| 218 |
|
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" .long 0b,2b\n"
|
| 219 |
|
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".previous"
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| 220 |
|
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:"=r" (n), "=D" (s), "=a" (res), "=c" (tmp)
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| 221 |
|
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:"0" (n), "1" (s), "2" (0), "3" (mask)
|
| 222 |
|
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:"cc");
|
| 223 |
|
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return res & mask;
|
| 224 |
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}
|
| 225 |
|
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EXPORT_SYMBOL(strnlen_user);
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| 226 |
|
|
|
| 227 |
|
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#ifdef CONFIG_X86_INTEL_USERCOPY
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| 228 |
|
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static unsigned long
|
| 229 |
|
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__copy_user_intel(void __user *to, const void *from, unsigned long size)
|
| 230 |
|
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{
|
| 231 |
|
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int d0, d1;
|
| 232 |
|
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__asm__ __volatile__(
|
| 233 |
|
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" .align 2,0x90\n"
|
| 234 |
|
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"1: movl 32(%4), %%eax\n"
|
| 235 |
|
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" cmpl $67, %0\n"
|
| 236 |
|
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" jbe 3f\n"
|
| 237 |
|
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"2: movl 64(%4), %%eax\n"
|
| 238 |
|
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" .align 2,0x90\n"
|
| 239 |
|
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"3: movl 0(%4), %%eax\n"
|
| 240 |
|
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"4: movl 4(%4), %%edx\n"
|
| 241 |
|
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"5: movl %%eax, 0(%3)\n"
|
| 242 |
|
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"6: movl %%edx, 4(%3)\n"
|
| 243 |
|
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"7: movl 8(%4), %%eax\n"
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| 244 |
|
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"8: movl 12(%4),%%edx\n"
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| 245 |
|
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"9: movl %%eax, 8(%3)\n"
|
| 246 |
|
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"10: movl %%edx, 12(%3)\n"
|
| 247 |
|
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"11: movl 16(%4), %%eax\n"
|
| 248 |
|
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"12: movl 20(%4), %%edx\n"
|
| 249 |
|
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"13: movl %%eax, 16(%3)\n"
|
| 250 |
|
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"14: movl %%edx, 20(%3)\n"
|
| 251 |
|
|
"15: movl 24(%4), %%eax\n"
|
| 252 |
|
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"16: movl 28(%4), %%edx\n"
|
| 253 |
|
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"17: movl %%eax, 24(%3)\n"
|
| 254 |
|
|
"18: movl %%edx, 28(%3)\n"
|
| 255 |
|
|
"19: movl 32(%4), %%eax\n"
|
| 256 |
|
|
"20: movl 36(%4), %%edx\n"
|
| 257 |
|
|
"21: movl %%eax, 32(%3)\n"
|
| 258 |
|
|
"22: movl %%edx, 36(%3)\n"
|
| 259 |
|
|
"23: movl 40(%4), %%eax\n"
|
| 260 |
|
|
"24: movl 44(%4), %%edx\n"
|
| 261 |
|
|
"25: movl %%eax, 40(%3)\n"
|
| 262 |
|
|
"26: movl %%edx, 44(%3)\n"
|
| 263 |
|
|
"27: movl 48(%4), %%eax\n"
|
| 264 |
|
|
"28: movl 52(%4), %%edx\n"
|
| 265 |
|
|
"29: movl %%eax, 48(%3)\n"
|
| 266 |
|
|
"30: movl %%edx, 52(%3)\n"
|
| 267 |
|
|
"31: movl 56(%4), %%eax\n"
|
| 268 |
|
|
"32: movl 60(%4), %%edx\n"
|
| 269 |
|
|
"33: movl %%eax, 56(%3)\n"
|
| 270 |
|
|
"34: movl %%edx, 60(%3)\n"
|
| 271 |
|
|
" addl $-64, %0\n"
|
| 272 |
|
|
" addl $64, %4\n"
|
| 273 |
|
|
" addl $64, %3\n"
|
| 274 |
|
|
" cmpl $63, %0\n"
|
| 275 |
|
|
" ja 1b\n"
|
| 276 |
|
|
"35: movl %0, %%eax\n"
|
| 277 |
|
|
" shrl $2, %0\n"
|
| 278 |
|
|
" andl $3, %%eax\n"
|
| 279 |
|
|
" cld\n"
|
| 280 |
|
|
"99: rep; movsl\n"
|
| 281 |
|
|
"36: movl %%eax, %0\n"
|
| 282 |
|
|
"37: rep; movsb\n"
|
| 283 |
|
|
"100:\n"
|
| 284 |
|
|
".section .fixup,\"ax\"\n"
|
| 285 |
|
|
"101: lea 0(%%eax,%0,4),%0\n"
|
| 286 |
|
|
" jmp 100b\n"
|
| 287 |
|
|
".previous\n"
|
| 288 |
|
|
".section __ex_table,\"a\"\n"
|
| 289 |
|
|
" .align 4\n"
|
| 290 |
|
|
" .long 1b,100b\n"
|
| 291 |
|
|
" .long 2b,100b\n"
|
| 292 |
|
|
" .long 3b,100b\n"
|
| 293 |
|
|
" .long 4b,100b\n"
|
| 294 |
|
|
" .long 5b,100b\n"
|
| 295 |
|
|
" .long 6b,100b\n"
|
| 296 |
|
|
" .long 7b,100b\n"
|
| 297 |
|
|
" .long 8b,100b\n"
|
| 298 |
|
|
" .long 9b,100b\n"
|
| 299 |
|
|
" .long 10b,100b\n"
|
| 300 |
|
|
" .long 11b,100b\n"
|
| 301 |
|
|
" .long 12b,100b\n"
|
| 302 |
|
|
" .long 13b,100b\n"
|
| 303 |
|
|
" .long 14b,100b\n"
|
| 304 |
|
|
" .long 15b,100b\n"
|
| 305 |
|
|
" .long 16b,100b\n"
|
| 306 |
|
|
" .long 17b,100b\n"
|
| 307 |
|
|
" .long 18b,100b\n"
|
| 308 |
|
|
" .long 19b,100b\n"
|
| 309 |
|
|
" .long 20b,100b\n"
|
| 310 |
|
|
" .long 21b,100b\n"
|
| 311 |
|
|
" .long 22b,100b\n"
|
| 312 |
|
|
" .long 23b,100b\n"
|
| 313 |
|
|
" .long 24b,100b\n"
|
| 314 |
|
|
" .long 25b,100b\n"
|
| 315 |
|
|
" .long 26b,100b\n"
|
| 316 |
|
|
" .long 27b,100b\n"
|
| 317 |
|
|
" .long 28b,100b\n"
|
| 318 |
|
|
" .long 29b,100b\n"
|
| 319 |
|
|
" .long 30b,100b\n"
|
| 320 |
|
|
" .long 31b,100b\n"
|
| 321 |
|
|
" .long 32b,100b\n"
|
| 322 |
|
|
" .long 33b,100b\n"
|
| 323 |
|
|
" .long 34b,100b\n"
|
| 324 |
|
|
" .long 35b,100b\n"
|
| 325 |
|
|
" .long 36b,100b\n"
|
| 326 |
|
|
" .long 37b,100b\n"
|
| 327 |
|
|
" .long 99b,101b\n"
|
| 328 |
|
|
".previous"
|
| 329 |
|
|
: "=&c"(size), "=&D" (d0), "=&S" (d1)
|
| 330 |
|
|
: "1"(to), "2"(from), "0"(size)
|
| 331 |
|
|
: "eax", "edx", "memory");
|
| 332 |
|
|
return size;
|
| 333 |
|
|
}
|
| 334 |
|
|
|
| 335 |
|
|
static unsigned long
|
| 336 |
|
|
__copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size)
|
| 337 |
|
|
{
|
| 338 |
|
|
int d0, d1;
|
| 339 |
|
|
__asm__ __volatile__(
|
| 340 |
|
|
" .align 2,0x90\n"
|
| 341 |
|
|
"0: movl 32(%4), %%eax\n"
|
| 342 |
|
|
" cmpl $67, %0\n"
|
| 343 |
|
|
" jbe 2f\n"
|
| 344 |
|
|
"1: movl 64(%4), %%eax\n"
|
| 345 |
|
|
" .align 2,0x90\n"
|
| 346 |
|
|
"2: movl 0(%4), %%eax\n"
|
| 347 |
|
|
"21: movl 4(%4), %%edx\n"
|
| 348 |
|
|
" movl %%eax, 0(%3)\n"
|
| 349 |
|
|
" movl %%edx, 4(%3)\n"
|
| 350 |
|
|
"3: movl 8(%4), %%eax\n"
|
| 351 |
|
|
"31: movl 12(%4),%%edx\n"
|
| 352 |
|
|
" movl %%eax, 8(%3)\n"
|
| 353 |
|
|
" movl %%edx, 12(%3)\n"
|
| 354 |
|
|
"4: movl 16(%4), %%eax\n"
|
| 355 |
|
|
"41: movl 20(%4), %%edx\n"
|
| 356 |
|
|
" movl %%eax, 16(%3)\n"
|
| 357 |
|
|
" movl %%edx, 20(%3)\n"
|
| 358 |
|
|
"10: movl 24(%4), %%eax\n"
|
| 359 |
|
|
"51: movl 28(%4), %%edx\n"
|
| 360 |
|
|
" movl %%eax, 24(%3)\n"
|
| 361 |
|
|
" movl %%edx, 28(%3)\n"
|
| 362 |
|
|
"11: movl 32(%4), %%eax\n"
|
| 363 |
|
|
"61: movl 36(%4), %%edx\n"
|
| 364 |
|
|
" movl %%eax, 32(%3)\n"
|
| 365 |
|
|
" movl %%edx, 36(%3)\n"
|
| 366 |
|
|
"12: movl 40(%4), %%eax\n"
|
| 367 |
|
|
"71: movl 44(%4), %%edx\n"
|
| 368 |
|
|
" movl %%eax, 40(%3)\n"
|
| 369 |
|
|
" movl %%edx, 44(%3)\n"
|
| 370 |
|
|
"13: movl 48(%4), %%eax\n"
|
| 371 |
|
|
"81: movl 52(%4), %%edx\n"
|
| 372 |
|
|
" movl %%eax, 48(%3)\n"
|
| 373 |
|
|
" movl %%edx, 52(%3)\n"
|
| 374 |
|
|
"14: movl 56(%4), %%eax\n"
|
| 375 |
|
|
"91: movl 60(%4), %%edx\n"
|
| 376 |
|
|
" movl %%eax, 56(%3)\n"
|
| 377 |
|
|
" movl %%edx, 60(%3)\n"
|
| 378 |
|
|
" addl $-64, %0\n"
|
| 379 |
|
|
" addl $64, %4\n"
|
| 380 |
|
|
" addl $64, %3\n"
|
| 381 |
|
|
" cmpl $63, %0\n"
|
| 382 |
|
|
" ja 0b\n"
|
| 383 |
|
|
"5: movl %0, %%eax\n"
|
| 384 |
|
|
" shrl $2, %0\n"
|
| 385 |
|
|
" andl $3, %%eax\n"
|
| 386 |
|
|
" cld\n"
|
| 387 |
|
|
"6: rep; movsl\n"
|
| 388 |
|
|
" movl %%eax,%0\n"
|
| 389 |
|
|
"7: rep; movsb\n"
|
| 390 |
|
|
"8:\n"
|
| 391 |
|
|
".section .fixup,\"ax\"\n"
|
| 392 |
|
|
"9: lea 0(%%eax,%0,4),%0\n"
|
| 393 |
|
|
"16: pushl %0\n"
|
| 394 |
|
|
" pushl %%eax\n"
|
| 395 |
|
|
" xorl %%eax,%%eax\n"
|
| 396 |
|
|
" rep; stosb\n"
|
| 397 |
|
|
" popl %%eax\n"
|
| 398 |
|
|
" popl %0\n"
|
| 399 |
|
|
" jmp 8b\n"
|
| 400 |
|
|
".previous\n"
|
| 401 |
|
|
".section __ex_table,\"a\"\n"
|
| 402 |
|
|
" .align 4\n"
|
| 403 |
|
|
" .long 0b,16b\n"
|
| 404 |
|
|
" .long 1b,16b\n"
|
| 405 |
|
|
" .long 2b,16b\n"
|
| 406 |
|
|
" .long 21b,16b\n"
|
| 407 |
|
|
" .long 3b,16b\n"
|
| 408 |
|
|
" .long 31b,16b\n"
|
| 409 |
|
|
" .long 4b,16b\n"
|
| 410 |
|
|
" .long 41b,16b\n"
|
| 411 |
|
|
" .long 10b,16b\n"
|
| 412 |
|
|
" .long 51b,16b\n"
|
| 413 |
|
|
" .long 11b,16b\n"
|
| 414 |
|
|
" .long 61b,16b\n"
|
| 415 |
|
|
" .long 12b,16b\n"
|
| 416 |
|
|
" .long 71b,16b\n"
|
| 417 |
|
|
" .long 13b,16b\n"
|
| 418 |
|
|
" .long 81b,16b\n"
|
| 419 |
|
|
" .long 14b,16b\n"
|
| 420 |
|
|
" .long 91b,16b\n"
|
| 421 |
|
|
" .long 6b,9b\n"
|
| 422 |
|
|
" .long 7b,16b\n"
|
| 423 |
|
|
".previous"
|
| 424 |
|
|
: "=&c"(size), "=&D" (d0), "=&S" (d1)
|
| 425 |
|
|
: "1"(to), "2"(from), "0"(size)
|
| 426 |
|
|
: "eax", "edx", "memory");
|
| 427 |
|
|
return size;
|
| 428 |
|
|
}
|
| 429 |
|
|
|
| 430 |
|
|
/*
|
| 431 |
|
|
* Non Temporal Hint version of __copy_user_zeroing_intel. It is cache aware.
|
| 432 |
|
|
* hyoshiok@miraclelinux.com
|
| 433 |
|
|
*/
|
| 434 |
|
|
|
| 435 |
|
|
static unsigned long __copy_user_zeroing_intel_nocache(void *to,
|
| 436 |
|
|
const void __user *from, unsigned long size)
|
| 437 |
|
|
{
|
| 438 |
|
|
int d0, d1;
|
| 439 |
|
|
|
| 440 |
|
|
__asm__ __volatile__(
|
| 441 |
|
|
" .align 2,0x90\n"
|
| 442 |
|
|
"0: movl 32(%4), %%eax\n"
|
| 443 |
|
|
" cmpl $67, %0\n"
|
| 444 |
|
|
" jbe 2f\n"
|
| 445 |
|
|
"1: movl 64(%4), %%eax\n"
|
| 446 |
|
|
" .align 2,0x90\n"
|
| 447 |
|
|
"2: movl 0(%4), %%eax\n"
|
| 448 |
|
|
"21: movl 4(%4), %%edx\n"
|
| 449 |
|
|
" movnti %%eax, 0(%3)\n"
|
| 450 |
|
|
" movnti %%edx, 4(%3)\n"
|
| 451 |
|
|
"3: movl 8(%4), %%eax\n"
|
| 452 |
|
|
"31: movl 12(%4),%%edx\n"
|
| 453 |
|
|
" movnti %%eax, 8(%3)\n"
|
| 454 |
|
|
" movnti %%edx, 12(%3)\n"
|
| 455 |
|
|
"4: movl 16(%4), %%eax\n"
|
| 456 |
|
|
"41: movl 20(%4), %%edx\n"
|
| 457 |
|
|
" movnti %%eax, 16(%3)\n"
|
| 458 |
|
|
" movnti %%edx, 20(%3)\n"
|
| 459 |
|
|
"10: movl 24(%4), %%eax\n"
|
| 460 |
|
|
"51: movl 28(%4), %%edx\n"
|
| 461 |
|
|
" movnti %%eax, 24(%3)\n"
|
| 462 |
|
|
" movnti %%edx, 28(%3)\n"
|
| 463 |
|
|
"11: movl 32(%4), %%eax\n"
|
| 464 |
|
|
"61: movl 36(%4), %%edx\n"
|
| 465 |
|
|
" movnti %%eax, 32(%3)\n"
|
| 466 |
|
|
" movnti %%edx, 36(%3)\n"
|
| 467 |
|
|
"12: movl 40(%4), %%eax\n"
|
| 468 |
|
|
"71: movl 44(%4), %%edx\n"
|
| 469 |
|
|
" movnti %%eax, 40(%3)\n"
|
| 470 |
|
|
" movnti %%edx, 44(%3)\n"
|
| 471 |
|
|
"13: movl 48(%4), %%eax\n"
|
| 472 |
|
|
"81: movl 52(%4), %%edx\n"
|
| 473 |
|
|
" movnti %%eax, 48(%3)\n"
|
| 474 |
|
|
" movnti %%edx, 52(%3)\n"
|
| 475 |
|
|
"14: movl 56(%4), %%eax\n"
|
| 476 |
|
|
"91: movl 60(%4), %%edx\n"
|
| 477 |
|
|
" movnti %%eax, 56(%3)\n"
|
| 478 |
|
|
" movnti %%edx, 60(%3)\n"
|
| 479 |
|
|
" addl $-64, %0\n"
|
| 480 |
|
|
" addl $64, %4\n"
|
| 481 |
|
|
" addl $64, %3\n"
|
| 482 |
|
|
" cmpl $63, %0\n"
|
| 483 |
|
|
" ja 0b\n"
|
| 484 |
|
|
" sfence \n"
|
| 485 |
|
|
"5: movl %0, %%eax\n"
|
| 486 |
|
|
" shrl $2, %0\n"
|
| 487 |
|
|
" andl $3, %%eax\n"
|
| 488 |
|
|
" cld\n"
|
| 489 |
|
|
"6: rep; movsl\n"
|
| 490 |
|
|
" movl %%eax,%0\n"
|
| 491 |
|
|
"7: rep; movsb\n"
|
| 492 |
|
|
"8:\n"
|
| 493 |
|
|
".section .fixup,\"ax\"\n"
|
| 494 |
|
|
"9: lea 0(%%eax,%0,4),%0\n"
|
| 495 |
|
|
"16: pushl %0\n"
|
| 496 |
|
|
" pushl %%eax\n"
|
| 497 |
|
|
" xorl %%eax,%%eax\n"
|
| 498 |
|
|
" rep; stosb\n"
|
| 499 |
|
|
" popl %%eax\n"
|
| 500 |
|
|
" popl %0\n"
|
| 501 |
|
|
" jmp 8b\n"
|
| 502 |
|
|
".previous\n"
|
| 503 |
|
|
".section __ex_table,\"a\"\n"
|
| 504 |
|
|
" .align 4\n"
|
| 505 |
|
|
" .long 0b,16b\n"
|
| 506 |
|
|
" .long 1b,16b\n"
|
| 507 |
|
|
" .long 2b,16b\n"
|
| 508 |
|
|
" .long 21b,16b\n"
|
| 509 |
|
|
" .long 3b,16b\n"
|
| 510 |
|
|
" .long 31b,16b\n"
|
| 511 |
|
|
" .long 4b,16b\n"
|
| 512 |
|
|
" .long 41b,16b\n"
|
| 513 |
|
|
" .long 10b,16b\n"
|
| 514 |
|
|
" .long 51b,16b\n"
|
| 515 |
|
|
" .long 11b,16b\n"
|
| 516 |
|
|
" .long 61b,16b\n"
|
| 517 |
|
|
" .long 12b,16b\n"
|
| 518 |
|
|
" .long 71b,16b\n"
|
| 519 |
|
|
" .long 13b,16b\n"
|
| 520 |
|
|
" .long 81b,16b\n"
|
| 521 |
|
|
" .long 14b,16b\n"
|
| 522 |
|
|
" .long 91b,16b\n"
|
| 523 |
|
|
" .long 6b,9b\n"
|
| 524 |
|
|
" .long 7b,16b\n"
|
| 525 |
|
|
".previous"
|
| 526 |
|
|
: "=&c"(size), "=&D" (d0), "=&S" (d1)
|
| 527 |
|
|
: "1"(to), "2"(from), "0"(size)
|
| 528 |
|
|
: "eax", "edx", "memory");
|
| 529 |
|
|
return size;
|
| 530 |
|
|
}
|
| 531 |
|
|
|
| 532 |
|
|
static unsigned long __copy_user_intel_nocache(void *to,
|
| 533 |
|
|
const void __user *from, unsigned long size)
|
| 534 |
|
|
{
|
| 535 |
|
|
int d0, d1;
|
| 536 |
|
|
|
| 537 |
|
|
__asm__ __volatile__(
|
| 538 |
|
|
" .align 2,0x90\n"
|
| 539 |
|
|
"0: movl 32(%4), %%eax\n"
|
| 540 |
|
|
" cmpl $67, %0\n"
|
| 541 |
|
|
" jbe 2f\n"
|
| 542 |
|
|
"1: movl 64(%4), %%eax\n"
|
| 543 |
|
|
" .align 2,0x90\n"
|
| 544 |
|
|
"2: movl 0(%4), %%eax\n"
|
| 545 |
|
|
"21: movl 4(%4), %%edx\n"
|
| 546 |
|
|
" movnti %%eax, 0(%3)\n"
|
| 547 |
|
|
" movnti %%edx, 4(%3)\n"
|
| 548 |
|
|
"3: movl 8(%4), %%eax\n"
|
| 549 |
|
|
"31: movl 12(%4),%%edx\n"
|
| 550 |
|
|
" movnti %%eax, 8(%3)\n"
|
| 551 |
|
|
" movnti %%edx, 12(%3)\n"
|
| 552 |
|
|
"4: movl 16(%4), %%eax\n"
|
| 553 |
|
|
"41: movl 20(%4), %%edx\n"
|
| 554 |
|
|
" movnti %%eax, 16(%3)\n"
|
| 555 |
|
|
" movnti %%edx, 20(%3)\n"
|
| 556 |
|
|
"10: movl 24(%4), %%eax\n"
|
| 557 |
|
|
"51: movl 28(%4), %%edx\n"
|
| 558 |
|
|
" movnti %%eax, 24(%3)\n"
|
| 559 |
|
|
" movnti %%edx, 28(%3)\n"
|
| 560 |
|
|
"11: movl 32(%4), %%eax\n"
|
| 561 |
|
|
"61: movl 36(%4), %%edx\n"
|
| 562 |
|
|
" movnti %%eax, 32(%3)\n"
|
| 563 |
|
|
" movnti %%edx, 36(%3)\n"
|
| 564 |
|
|
"12: movl 40(%4), %%eax\n"
|
| 565 |
|
|
"71: movl 44(%4), %%edx\n"
|
| 566 |
|
|
" movnti %%eax, 40(%3)\n"
|
| 567 |
|
|
" movnti %%edx, 44(%3)\n"
|
| 568 |
|
|
"13: movl 48(%4), %%eax\n"
|
| 569 |
|
|
"81: movl 52(%4), %%edx\n"
|
| 570 |
|
|
" movnti %%eax, 48(%3)\n"
|
| 571 |
|
|
" movnti %%edx, 52(%3)\n"
|
| 572 |
|
|
"14: movl 56(%4), %%eax\n"
|
| 573 |
|
|
"91: movl 60(%4), %%edx\n"
|
| 574 |
|
|
" movnti %%eax, 56(%3)\n"
|
| 575 |
|
|
" movnti %%edx, 60(%3)\n"
|
| 576 |
|
|
" addl $-64, %0\n"
|
| 577 |
|
|
" addl $64, %4\n"
|
| 578 |
|
|
" addl $64, %3\n"
|
| 579 |
|
|
" cmpl $63, %0\n"
|
| 580 |
|
|
" ja 0b\n"
|
| 581 |
|
|
" sfence \n"
|
| 582 |
|
|
"5: movl %0, %%eax\n"
|
| 583 |
|
|
" shrl $2, %0\n"
|
| 584 |
|
|
" andl $3, %%eax\n"
|
| 585 |
|
|
" cld\n"
|
| 586 |
|
|
"6: rep; movsl\n"
|
| 587 |
|
|
" movl %%eax,%0\n"
|
| 588 |
|
|
"7: rep; movsb\n"
|
| 589 |
|
|
"8:\n"
|
| 590 |
|
|
".section .fixup,\"ax\"\n"
|
| 591 |
|
|
"9: lea 0(%%eax,%0,4),%0\n"
|
| 592 |
|
|
"16: jmp 8b\n"
|
| 593 |
|
|
".previous\n"
|
| 594 |
|
|
".section __ex_table,\"a\"\n"
|
| 595 |
|
|
" .align 4\n"
|
| 596 |
|
|
" .long 0b,16b\n"
|
| 597 |
|
|
" .long 1b,16b\n"
|
| 598 |
|
|
" .long 2b,16b\n"
|
| 599 |
|
|
" .long 21b,16b\n"
|
| 600 |
|
|
" .long 3b,16b\n"
|
| 601 |
|
|
" .long 31b,16b\n"
|
| 602 |
|
|
" .long 4b,16b\n"
|
| 603 |
|
|
" .long 41b,16b\n"
|
| 604 |
|
|
" .long 10b,16b\n"
|
| 605 |
|
|
" .long 51b,16b\n"
|
| 606 |
|
|
" .long 11b,16b\n"
|
| 607 |
|
|
" .long 61b,16b\n"
|
| 608 |
|
|
" .long 12b,16b\n"
|
| 609 |
|
|
" .long 71b,16b\n"
|
| 610 |
|
|
" .long 13b,16b\n"
|
| 611 |
|
|
" .long 81b,16b\n"
|
| 612 |
|
|
" .long 14b,16b\n"
|
| 613 |
|
|
" .long 91b,16b\n"
|
| 614 |
|
|
" .long 6b,9b\n"
|
| 615 |
|
|
" .long 7b,16b\n"
|
| 616 |
|
|
".previous"
|
| 617 |
|
|
: "=&c"(size), "=&D" (d0), "=&S" (d1)
|
| 618 |
|
|
: "1"(to), "2"(from), "0"(size)
|
| 619 |
|
|
: "eax", "edx", "memory");
|
| 620 |
|
|
return size;
|
| 621 |
|
|
}
|
| 622 |
|
|
|
| 623 |
|
|
#else
|
| 624 |
|
|
|
| 625 |
|
|
/*
|
| 626 |
|
|
* Leave these declared but undefined. They should not be any references to
|
| 627 |
|
|
* them
|
| 628 |
|
|
*/
|
| 629 |
|
|
unsigned long __copy_user_zeroing_intel(void *to, const void __user *from,
|
| 630 |
|
|
unsigned long size);
|
| 631 |
|
|
unsigned long __copy_user_intel(void __user *to, const void *from,
|
| 632 |
|
|
unsigned long size);
|
| 633 |
|
|
unsigned long __copy_user_zeroing_intel_nocache(void *to,
|
| 634 |
|
|
const void __user *from, unsigned long size);
|
| 635 |
|
|
#endif /* CONFIG_X86_INTEL_USERCOPY */
|
| 636 |
|
|
|
| 637 |
|
|
/* Generic arbitrary sized copy. */
|
| 638 |
|
|
#define __copy_user(to,from,size) \
|
| 639 |
|
|
do { \
|
| 640 |
|
|
int __d0, __d1, __d2; \
|
| 641 |
|
|
__asm__ __volatile__( \
|
| 642 |
|
|
" cmp $7,%0\n" \
|
| 643 |
|
|
" jbe 1f\n" \
|
| 644 |
|
|
" movl %1,%0\n" \
|
| 645 |
|
|
" negl %0\n" \
|
| 646 |
|
|
" andl $7,%0\n" \
|
| 647 |
|
|
" subl %0,%3\n" \
|
| 648 |
|
|
"4: rep; movsb\n" \
|
| 649 |
|
|
" movl %3,%0\n" \
|
| 650 |
|
|
" shrl $2,%0\n" \
|
| 651 |
|
|
" andl $3,%3\n" \
|
| 652 |
|
|
" .align 2,0x90\n" \
|
| 653 |
|
|
"0: rep; movsl\n" \
|
| 654 |
|
|
" movl %3,%0\n" \
|
| 655 |
|
|
"1: rep; movsb\n" \
|
| 656 |
|
|
"2:\n" \
|
| 657 |
|
|
".section .fixup,\"ax\"\n" \
|
| 658 |
|
|
"5: addl %3,%0\n" \
|
| 659 |
|
|
" jmp 2b\n" \
|
| 660 |
|
|
"3: lea 0(%3,%0,4),%0\n" \
|
| 661 |
|
|
" jmp 2b\n" \
|
| 662 |
|
|
".previous\n" \
|
| 663 |
|
|
".section __ex_table,\"a\"\n" \
|
| 664 |
|
|
" .align 4\n" \
|
| 665 |
|
|
" .long 4b,5b\n" \
|
| 666 |
|
|
" .long 0b,3b\n" \
|
| 667 |
|
|
" .long 1b,2b\n" \
|
| 668 |
|
|
".previous" \
|
| 669 |
|
|
: "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
|
| 670 |
|
|
: "3"(size), "0"(size), "1"(to), "2"(from) \
|
| 671 |
|
|
: "memory"); \
|
| 672 |
|
|
} while (0)
|
| 673 |
|
|
|
| 674 |
|
|
#define __copy_user_zeroing(to,from,size) \
|
| 675 |
|
|
do { \
|
| 676 |
|
|
int __d0, __d1, __d2; \
|
| 677 |
|
|
__asm__ __volatile__( \
|
| 678 |
|
|
" cmp $7,%0\n" \
|
| 679 |
|
|
" jbe 1f\n" \
|
| 680 |
|
|
" movl %1,%0\n" \
|
| 681 |
|
|
" negl %0\n" \
|
| 682 |
|
|
" andl $7,%0\n" \
|
| 683 |
|
|
" subl %0,%3\n" \
|
| 684 |
|
|
"4: rep; movsb\n" \
|
| 685 |
|
|
" movl %3,%0\n" \
|
| 686 |
|
|
" shrl $2,%0\n" \
|
| 687 |
|
|
" andl $3,%3\n" \
|
| 688 |
|
|
" .align 2,0x90\n" \
|
| 689 |
|
|
"0: rep; movsl\n" \
|
| 690 |
|
|
" movl %3,%0\n" \
|
| 691 |
|
|
"1: rep; movsb\n" \
|
| 692 |
|
|
"2:\n" \
|
| 693 |
|
|
".section .fixup,\"ax\"\n" \
|
| 694 |
|
|
"5: addl %3,%0\n" \
|
| 695 |
|
|
" jmp 6f\n" \
|
| 696 |
|
|
"3: lea 0(%3,%0,4),%0\n" \
|
| 697 |
|
|
"6: pushl %0\n" \
|
| 698 |
|
|
" pushl %%eax\n" \
|
| 699 |
|
|
" xorl %%eax,%%eax\n" \
|
| 700 |
|
|
" rep; stosb\n" \
|
| 701 |
|
|
" popl %%eax\n" \
|
| 702 |
|
|
" popl %0\n" \
|
| 703 |
|
|
" jmp 2b\n" \
|
| 704 |
|
|
".previous\n" \
|
| 705 |
|
|
".section __ex_table,\"a\"\n" \
|
| 706 |
|
|
" .align 4\n" \
|
| 707 |
|
|
" .long 4b,5b\n" \
|
| 708 |
|
|
" .long 0b,3b\n" \
|
| 709 |
|
|
" .long 1b,6b\n" \
|
| 710 |
|
|
".previous" \
|
| 711 |
|
|
: "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
|
| 712 |
|
|
: "3"(size), "0"(size), "1"(to), "2"(from) \
|
| 713 |
|
|
: "memory"); \
|
| 714 |
|
|
} while (0)
|
| 715 |
|
|
|
| 716 |
|
|
unsigned long __copy_to_user_ll(void __user *to, const void *from,
|
| 717 |
|
|
unsigned long n)
|
| 718 |
|
|
{
|
| 719 |
|
|
#ifndef CONFIG_X86_WP_WORKS_OK
|
| 720 |
|
|
if (unlikely(boot_cpu_data.wp_works_ok == 0) &&
|
| 721 |
|
|
((unsigned long )to) < TASK_SIZE) {
|
| 722 |
|
|
/*
|
| 723 |
|
|
* When we are in an atomic section (see
|
| 724 |
|
|
* mm/filemap.c:file_read_actor), return the full
|
| 725 |
|
|
* length to take the slow path.
|
| 726 |
|
|
*/
|
| 727 |
|
|
if (in_atomic())
|
| 728 |
|
|
return n;
|
| 729 |
|
|
|
| 730 |
|
|
/*
|
| 731 |
|
|
* CPU does not honor the WP bit when writing
|
| 732 |
|
|
* from supervisory mode, and due to preemption or SMP,
|
| 733 |
|
|
* the page tables can change at any time.
|
| 734 |
|
|
* Do it manually. Manfred <manfred@colorfullife.com>
|
| 735 |
|
|
*/
|
| 736 |
|
|
while (n) {
|
| 737 |
|
|
unsigned long offset = ((unsigned long)to)%PAGE_SIZE;
|
| 738 |
|
|
unsigned long len = PAGE_SIZE - offset;
|
| 739 |
|
|
int retval;
|
| 740 |
|
|
struct page *pg;
|
| 741 |
|
|
void *maddr;
|
| 742 |
|
|
|
| 743 |
|
|
if (len > n)
|
| 744 |
|
|
len = n;
|
| 745 |
|
|
|
| 746 |
|
|
survive:
|
| 747 |
|
|
down_read(¤t->mm->mmap_sem);
|
| 748 |
|
|
retval = get_user_pages(current, current->mm,
|
| 749 |
|
|
(unsigned long )to, 1, 1, 0, &pg, NULL);
|
| 750 |
|
|
|
| 751 |
|
|
if (retval == -ENOMEM && is_global_init(current)) {
|
| 752 |
|
|
up_read(¤t->mm->mmap_sem);
|
| 753 |
|
|
congestion_wait(WRITE, HZ/50);
|
| 754 |
|
|
goto survive;
|
| 755 |
|
|
}
|
| 756 |
|
|
|
| 757 |
|
|
if (retval != 1) {
|
| 758 |
|
|
up_read(¤t->mm->mmap_sem);
|
| 759 |
|
|
break;
|
| 760 |
|
|
}
|
| 761 |
|
|
|
| 762 |
|
|
maddr = kmap_atomic(pg, KM_USER0);
|
| 763 |
|
|
memcpy(maddr + offset, from, len);
|
| 764 |
|
|
kunmap_atomic(maddr, KM_USER0);
|
| 765 |
|
|
set_page_dirty_lock(pg);
|
| 766 |
|
|
put_page(pg);
|
| 767 |
|
|
up_read(¤t->mm->mmap_sem);
|
| 768 |
|
|
|
| 769 |
|
|
from += len;
|
| 770 |
|
|
to += len;
|
| 771 |
|
|
n -= len;
|
| 772 |
|
|
}
|
| 773 |
|
|
return n;
|
| 774 |
|
|
}
|
| 775 |
|
|
#endif
|
| 776 |
|
|
if (movsl_is_ok(to, from, n))
|
| 777 |
|
|
__copy_user(to, from, n);
|
| 778 |
|
|
else
|
| 779 |
|
|
n = __copy_user_intel(to, from, n);
|
| 780 |
|
|
return n;
|
| 781 |
|
|
}
|
| 782 |
|
|
EXPORT_SYMBOL(__copy_to_user_ll);
|
| 783 |
|
|
|
| 784 |
|
|
unsigned long __copy_from_user_ll(void *to, const void __user *from,
|
| 785 |
|
|
unsigned long n)
|
| 786 |
|
|
{
|
| 787 |
|
|
if (movsl_is_ok(to, from, n))
|
| 788 |
|
|
__copy_user_zeroing(to, from, n);
|
| 789 |
|
|
else
|
| 790 |
|
|
n = __copy_user_zeroing_intel(to, from, n);
|
| 791 |
|
|
return n;
|
| 792 |
|
|
}
|
| 793 |
|
|
EXPORT_SYMBOL(__copy_from_user_ll);
|
| 794 |
|
|
|
| 795 |
|
|
unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from,
|
| 796 |
|
|
unsigned long n)
|
| 797 |
|
|
{
|
| 798 |
|
|
if (movsl_is_ok(to, from, n))
|
| 799 |
|
|
__copy_user(to, from, n);
|
| 800 |
|
|
else
|
| 801 |
|
|
n = __copy_user_intel((void __user *)to,
|
| 802 |
|
|
(const void *)from, n);
|
| 803 |
|
|
return n;
|
| 804 |
|
|
}
|
| 805 |
|
|
EXPORT_SYMBOL(__copy_from_user_ll_nozero);
|
| 806 |
|
|
|
| 807 |
|
|
unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
|
| 808 |
|
|
unsigned long n)
|
| 809 |
|
|
{
|
| 810 |
|
|
#ifdef CONFIG_X86_INTEL_USERCOPY
|
| 811 |
|
|
if ( n > 64 && cpu_has_xmm2)
|
| 812 |
|
|
n = __copy_user_zeroing_intel_nocache(to, from, n);
|
| 813 |
|
|
else
|
| 814 |
|
|
__copy_user_zeroing(to, from, n);
|
| 815 |
|
|
#else
|
| 816 |
|
|
__copy_user_zeroing(to, from, n);
|
| 817 |
|
|
#endif
|
| 818 |
|
|
return n;
|
| 819 |
|
|
}
|
| 820 |
|
|
|
| 821 |
|
|
unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
|
| 822 |
|
|
unsigned long n)
|
| 823 |
|
|
{
|
| 824 |
|
|
#ifdef CONFIG_X86_INTEL_USERCOPY
|
| 825 |
|
|
if ( n > 64 && cpu_has_xmm2)
|
| 826 |
|
|
n = __copy_user_intel_nocache(to, from, n);
|
| 827 |
|
|
else
|
| 828 |
|
|
__copy_user(to, from, n);
|
| 829 |
|
|
#else
|
| 830 |
|
|
__copy_user(to, from, n);
|
| 831 |
|
|
#endif
|
| 832 |
|
|
return n;
|
| 833 |
|
|
}
|
| 834 |
|
|
|
| 835 |
|
|
/**
|
| 836 |
|
|
* copy_to_user: - Copy a block of data into user space.
|
| 837 |
|
|
* @to: Destination address, in user space.
|
| 838 |
|
|
* @from: Source address, in kernel space.
|
| 839 |
|
|
* @n: Number of bytes to copy.
|
| 840 |
|
|
*
|
| 841 |
|
|
* Context: User context only. This function may sleep.
|
| 842 |
|
|
*
|
| 843 |
|
|
* Copy data from kernel space to user space.
|
| 844 |
|
|
*
|
| 845 |
|
|
* Returns number of bytes that could not be copied.
|
| 846 |
|
|
* On success, this will be zero.
|
| 847 |
|
|
*/
|
| 848 |
|
|
unsigned long
|
| 849 |
|
|
copy_to_user(void __user *to, const void *from, unsigned long n)
|
| 850 |
|
|
{
|
| 851 |
|
|
if (access_ok(VERIFY_WRITE, to, n))
|
| 852 |
|
|
n = __copy_to_user(to, from, n);
|
| 853 |
|
|
return n;
|
| 854 |
|
|
}
|
| 855 |
|
|
EXPORT_SYMBOL(copy_to_user);
|
| 856 |
|
|
|
| 857 |
|
|
/**
|
| 858 |
|
|
* copy_from_user: - Copy a block of data from user space.
|
| 859 |
|
|
* @to: Destination address, in kernel space.
|
| 860 |
|
|
* @from: Source address, in user space.
|
| 861 |
|
|
* @n: Number of bytes to copy.
|
| 862 |
|
|
*
|
| 863 |
|
|
* Context: User context only. This function may sleep.
|
| 864 |
|
|
*
|
| 865 |
|
|
* Copy data from user space to kernel space.
|
| 866 |
|
|
*
|
| 867 |
|
|
* Returns number of bytes that could not be copied.
|
| 868 |
|
|
* On success, this will be zero.
|
| 869 |
|
|
*
|
| 870 |
|
|
* If some data could not be copied, this function will pad the copied
|
| 871 |
|
|
* data to the requested size using zero bytes.
|
| 872 |
|
|
*/
|
| 873 |
|
|
unsigned long
|
| 874 |
|
|
copy_from_user(void *to, const void __user *from, unsigned long n)
|
| 875 |
|
|
{
|
| 876 |
|
|
if (access_ok(VERIFY_READ, from, n))
|
| 877 |
|
|
n = __copy_from_user(to, from, n);
|
| 878 |
|
|
else
|
| 879 |
|
|
memset(to, 0, n);
|
| 880 |
|
|
return n;
|
| 881 |
|
|
}
|
| 882 |
|
|
EXPORT_SYMBOL(copy_from_user);
|
