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791 lines
22 KiB
791 lines
22 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle |
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
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* Copyright (C) 2007 Maciej W. Rozycki |
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* Copyright (C) 2014, Imagination Technologies Ltd. |
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*/ |
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#ifndef _ASM_UACCESS_H |
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#define _ASM_UACCESS_H |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <asm/asm-eva.h> |
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#include <asm/extable.h> |
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/* |
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* The fs value determines whether argument validity checking should be |
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* performed or not. If get_fs() == USER_DS, checking is performed, with |
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* get_fs() == KERNEL_DS, checking is bypassed. |
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* |
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* For historical reasons, these macros are grossly misnamed. |
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*/ |
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#ifdef CONFIG_32BIT |
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#ifdef CONFIG_KVM_GUEST |
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#define __UA_LIMIT 0x40000000UL |
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#else |
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#define __UA_LIMIT 0x80000000UL |
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#endif |
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#define __UA_ADDR ".word" |
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#define __UA_LA "la" |
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#define __UA_ADDU "addu" |
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#define __UA_t0 "$8" |
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#define __UA_t1 "$9" |
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#endif /* CONFIG_32BIT */ |
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#ifdef CONFIG_64BIT |
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extern u64 __ua_limit; |
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#define __UA_LIMIT __ua_limit |
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#define __UA_ADDR ".dword" |
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#define __UA_LA "dla" |
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#define __UA_ADDU "daddu" |
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#define __UA_t0 "$12" |
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#define __UA_t1 "$13" |
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#endif /* CONFIG_64BIT */ |
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/* |
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* USER_DS is a bitmask that has the bits set that may not be set in a valid |
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* userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but |
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* the arithmetic we're doing only works if the limit is a power of two, so |
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* we use 0x80000000 here on 32-bit kernels. If a process passes an invalid |
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* address in this range it's the process's problem, not ours :-) |
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*/ |
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#ifdef CONFIG_KVM_GUEST |
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#define KERNEL_DS ((mm_segment_t) { 0x80000000UL }) |
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#define USER_DS ((mm_segment_t) { 0xC0000000UL }) |
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#else |
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#define KERNEL_DS ((mm_segment_t) { 0UL }) |
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#define USER_DS ((mm_segment_t) { __UA_LIMIT }) |
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#endif |
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#define get_fs() (current_thread_info()->addr_limit) |
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#define set_fs(x) (current_thread_info()->addr_limit = (x)) |
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#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg) |
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/* |
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* eva_kernel_access() - determine whether kernel memory access on an EVA system |
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* |
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* Determines whether memory accesses should be performed to kernel memory |
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* on a system using Extended Virtual Addressing (EVA). |
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* |
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* Return: true if a kernel memory access on an EVA system, else false. |
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*/ |
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static inline bool eva_kernel_access(void) |
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{ |
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if (!IS_ENABLED(CONFIG_EVA)) |
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return false; |
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return uaccess_kernel(); |
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} |
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/* |
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* Is a address valid? This does a straightforward calculation rather |
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* than tests. |
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* |
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* Address valid if: |
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* - "addr" doesn't have any high-bits set |
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* - AND "size" doesn't have any high-bits set |
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* - AND "addr+size" doesn't have any high-bits set |
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* - OR we are in kernel mode. |
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* |
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* __ua_size() is a trick to avoid runtime checking of positive constant |
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* sizes; for those we already know at compile time that the size is ok. |
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*/ |
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#define __ua_size(size) \ |
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((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size)) |
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/* |
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* access_ok: - Checks if a user space pointer is valid |
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* @addr: User space pointer to start of block to check |
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* @size: Size of block to check |
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* |
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* Context: User context only. This function may sleep if pagefaults are |
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* enabled. |
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* |
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* Checks if a pointer to a block of memory in user space is valid. |
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* |
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* Returns true (nonzero) if the memory block may be valid, false (zero) |
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* if it is definitely invalid. |
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* |
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* Note that, depending on architecture, this function probably just |
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* checks that the pointer is in the user space range - after calling |
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* this function, memory access functions may still return -EFAULT. |
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*/ |
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static inline int __access_ok(const void __user *p, unsigned long size) |
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{ |
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unsigned long addr = (unsigned long)p; |
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return (get_fs().seg & (addr | (addr + size) | __ua_size(size))) == 0; |
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} |
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#define access_ok(addr, size) \ |
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likely(__access_ok((addr), (size))) |
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/* |
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* put_user: - Write a simple value into user space. |
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* @x: Value to copy to user space. |
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* @ptr: Destination address, in user space. |
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* |
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* Context: User context only. This function may sleep if pagefaults are |
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* enabled. |
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* |
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* This macro copies a single simple value from kernel space to user |
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* space. It supports simple types like char and int, but not larger |
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* data types like structures or arrays. |
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* |
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable |
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* to the result of dereferencing @ptr. |
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* |
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* Returns zero on success, or -EFAULT on error. |
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*/ |
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#define put_user(x,ptr) \ |
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__put_user_check((x), (ptr), sizeof(*(ptr))) |
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/* |
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* get_user: - Get a simple variable from user space. |
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* @x: Variable to store result. |
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* @ptr: Source address, in user space. |
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* |
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* Context: User context only. This function may sleep if pagefaults are |
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* enabled. |
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* |
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* This macro copies a single simple variable from user space to kernel |
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* space. It supports simple types like char and int, but not larger |
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* data types like structures or arrays. |
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* |
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* @ptr must have pointer-to-simple-variable type, and the result of |
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* dereferencing @ptr must be assignable to @x without a cast. |
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* |
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* Returns zero on success, or -EFAULT on error. |
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* On error, the variable @x is set to zero. |
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*/ |
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#define get_user(x,ptr) \ |
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__get_user_check((x), (ptr), sizeof(*(ptr))) |
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/* |
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* __put_user: - Write a simple value into user space, with less checking. |
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* @x: Value to copy to user space. |
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* @ptr: Destination address, in user space. |
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* |
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* Context: User context only. This function may sleep if pagefaults are |
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* enabled. |
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* |
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* This macro copies a single simple value from kernel space to user |
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* space. It supports simple types like char and int, but not larger |
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* data types like structures or arrays. |
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* |
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable |
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* to the result of dereferencing @ptr. |
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* |
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* Caller must check the pointer with access_ok() before calling this |
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* function. |
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* |
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* Returns zero on success, or -EFAULT on error. |
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*/ |
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#define __put_user(x,ptr) \ |
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__put_user_nocheck((x), (ptr), sizeof(*(ptr))) |
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/* |
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* __get_user: - Get a simple variable from user space, with less checking. |
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* @x: Variable to store result. |
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* @ptr: Source address, in user space. |
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* |
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* Context: User context only. This function may sleep if pagefaults are |
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* enabled. |
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* |
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* This macro copies a single simple variable from user space to kernel |
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* space. It supports simple types like char and int, but not larger |
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* data types like structures or arrays. |
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* |
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* @ptr must have pointer-to-simple-variable type, and the result of |
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* dereferencing @ptr must be assignable to @x without a cast. |
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* |
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* Caller must check the pointer with access_ok() before calling this |
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* function. |
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* |
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* Returns zero on success, or -EFAULT on error. |
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* On error, the variable @x is set to zero. |
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*/ |
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#define __get_user(x,ptr) \ |
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__get_user_nocheck((x), (ptr), sizeof(*(ptr))) |
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struct __large_struct { unsigned long buf[100]; }; |
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#define __m(x) (*(struct __large_struct __user *)(x)) |
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/* |
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* Yuck. We need two variants, one for 64bit operation and one |
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* for 32 bit mode and old iron. |
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*/ |
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#ifndef CONFIG_EVA |
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#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr) |
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#else |
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/* |
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* Kernel specific functions for EVA. We need to use normal load instructions |
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* to read data from kernel when operating in EVA mode. We use these macros to |
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* avoid redefining __get_user_asm for EVA. |
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*/ |
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#undef _loadd |
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#undef _loadw |
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#undef _loadh |
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#undef _loadb |
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#ifdef CONFIG_32BIT |
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#define _loadd _loadw |
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#else |
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#define _loadd(reg, addr) "ld " reg ", " addr |
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#endif |
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#define _loadw(reg, addr) "lw " reg ", " addr |
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#define _loadh(reg, addr) "lh " reg ", " addr |
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#define _loadb(reg, addr) "lb " reg ", " addr |
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#define __get_kernel_common(val, size, ptr) \ |
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do { \ |
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switch (size) { \ |
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case 1: __get_data_asm(val, _loadb, ptr); break; \ |
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case 2: __get_data_asm(val, _loadh, ptr); break; \ |
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case 4: __get_data_asm(val, _loadw, ptr); break; \ |
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case 8: __GET_DW(val, _loadd, ptr); break; \ |
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default: __get_user_unknown(); break; \ |
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} \ |
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} while (0) |
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#endif |
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#ifdef CONFIG_32BIT |
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#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr) |
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#endif |
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#ifdef CONFIG_64BIT |
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#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr) |
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#endif |
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extern void __get_user_unknown(void); |
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#define __get_user_common(val, size, ptr) \ |
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do { \ |
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switch (size) { \ |
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case 1: __get_data_asm(val, user_lb, ptr); break; \ |
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case 2: __get_data_asm(val, user_lh, ptr); break; \ |
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case 4: __get_data_asm(val, user_lw, ptr); break; \ |
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case 8: __GET_DW(val, user_ld, ptr); break; \ |
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default: __get_user_unknown(); break; \ |
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} \ |
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} while (0) |
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#define __get_user_nocheck(x, ptr, size) \ |
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({ \ |
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int __gu_err; \ |
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\ |
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if (eva_kernel_access()) { \ |
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__get_kernel_common((x), size, ptr); \ |
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} else { \ |
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__chk_user_ptr(ptr); \ |
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__get_user_common((x), size, ptr); \ |
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} \ |
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__gu_err; \ |
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}) |
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#define __get_user_check(x, ptr, size) \ |
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({ \ |
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int __gu_err = -EFAULT; \ |
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const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \ |
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\ |
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might_fault(); \ |
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if (likely(access_ok( __gu_ptr, size))) { \ |
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if (eva_kernel_access()) \ |
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__get_kernel_common((x), size, __gu_ptr); \ |
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else \ |
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__get_user_common((x), size, __gu_ptr); \ |
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} else \ |
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(x) = 0; \ |
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\ |
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__gu_err; \ |
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}) |
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#define __get_data_asm(val, insn, addr) \ |
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{ \ |
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long __gu_tmp; \ |
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\ |
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__asm__ __volatile__( \ |
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"1: "insn("%1", "%3")" \n" \ |
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"2: \n" \ |
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" .insn \n" \ |
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" .section .fixup,\"ax\" \n" \ |
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"3: li %0, %4 \n" \ |
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" move %1, $0 \n" \ |
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" j 2b \n" \ |
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" .previous \n" \ |
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" .section __ex_table,\"a\" \n" \ |
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" "__UA_ADDR "\t1b, 3b \n" \ |
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" .previous \n" \ |
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: "=r" (__gu_err), "=r" (__gu_tmp) \ |
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: "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \ |
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\ |
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(val) = (__typeof__(*(addr))) __gu_tmp; \ |
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} |
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/* |
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* Get a long long 64 using 32 bit registers. |
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*/ |
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#define __get_data_asm_ll32(val, insn, addr) \ |
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{ \ |
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union { \ |
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unsigned long long l; \ |
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__typeof__(*(addr)) t; \ |
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} __gu_tmp; \ |
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\ |
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__asm__ __volatile__( \ |
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"1: " insn("%1", "(%3)")" \n" \ |
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"2: " insn("%D1", "4(%3)")" \n" \ |
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"3: \n" \ |
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" .insn \n" \ |
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" .section .fixup,\"ax\" \n" \ |
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"4: li %0, %4 \n" \ |
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" move %1, $0 \n" \ |
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" move %D1, $0 \n" \ |
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" j 3b \n" \ |
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" .previous \n" \ |
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" .section __ex_table,\"a\" \n" \ |
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" " __UA_ADDR " 1b, 4b \n" \ |
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" " __UA_ADDR " 2b, 4b \n" \ |
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" .previous \n" \ |
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: "=r" (__gu_err), "=&r" (__gu_tmp.l) \ |
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: "0" (0), "r" (addr), "i" (-EFAULT)); \ |
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\ |
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(val) = __gu_tmp.t; \ |
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} |
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#ifndef CONFIG_EVA |
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#define __put_kernel_common(ptr, size) __put_user_common(ptr, size) |
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#else |
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/* |
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* Kernel specific functions for EVA. We need to use normal load instructions |
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* to read data from kernel when operating in EVA mode. We use these macros to |
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* avoid redefining __get_data_asm for EVA. |
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*/ |
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#undef _stored |
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#undef _storew |
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#undef _storeh |
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#undef _storeb |
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#ifdef CONFIG_32BIT |
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#define _stored _storew |
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#else |
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#define _stored(reg, addr) "ld " reg ", " addr |
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#endif |
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#define _storew(reg, addr) "sw " reg ", " addr |
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#define _storeh(reg, addr) "sh " reg ", " addr |
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#define _storeb(reg, addr) "sb " reg ", " addr |
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#define __put_kernel_common(ptr, size) \ |
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do { \ |
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switch (size) { \ |
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case 1: __put_data_asm(_storeb, ptr); break; \ |
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case 2: __put_data_asm(_storeh, ptr); break; \ |
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case 4: __put_data_asm(_storew, ptr); break; \ |
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case 8: __PUT_DW(_stored, ptr); break; \ |
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default: __put_user_unknown(); break; \ |
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} \ |
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} while(0) |
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#endif |
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/* |
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* Yuck. We need two variants, one for 64bit operation and one |
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* for 32 bit mode and old iron. |
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*/ |
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#ifdef CONFIG_32BIT |
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#define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr) |
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#endif |
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#ifdef CONFIG_64BIT |
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#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr) |
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#endif |
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#define __put_user_common(ptr, size) \ |
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do { \ |
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switch (size) { \ |
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case 1: __put_data_asm(user_sb, ptr); break; \ |
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case 2: __put_data_asm(user_sh, ptr); break; \ |
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case 4: __put_data_asm(user_sw, ptr); break; \ |
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case 8: __PUT_DW(user_sd, ptr); break; \ |
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default: __put_user_unknown(); break; \ |
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} \ |
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} while (0) |
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#define __put_user_nocheck(x, ptr, size) \ |
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({ \ |
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__typeof__(*(ptr)) __pu_val; \ |
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int __pu_err = 0; \ |
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\ |
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__pu_val = (x); \ |
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if (eva_kernel_access()) { \ |
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__put_kernel_common(ptr, size); \ |
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} else { \ |
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__chk_user_ptr(ptr); \ |
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__put_user_common(ptr, size); \ |
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} \ |
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__pu_err; \ |
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}) |
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#define __put_user_check(x, ptr, size) \ |
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({ \ |
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
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__typeof__(*(ptr)) __pu_val = (x); \ |
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int __pu_err = -EFAULT; \ |
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\ |
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might_fault(); \ |
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if (likely(access_ok( __pu_addr, size))) { \ |
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if (eva_kernel_access()) \ |
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__put_kernel_common(__pu_addr, size); \ |
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else \ |
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__put_user_common(__pu_addr, size); \ |
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} \ |
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\ |
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__pu_err; \ |
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}) |
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#define __put_data_asm(insn, ptr) \ |
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{ \ |
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__asm__ __volatile__( \ |
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"1: "insn("%z2", "%3")" # __put_data_asm \n" \ |
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"2: \n" \ |
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" .insn \n" \ |
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" .section .fixup,\"ax\" \n" \ |
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"3: li %0, %4 \n" \ |
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" j 2b \n" \ |
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" .previous \n" \ |
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" .section __ex_table,\"a\" \n" \ |
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" " __UA_ADDR " 1b, 3b \n" \ |
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" .previous \n" \ |
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: "=r" (__pu_err) \ |
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: "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \ |
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"i" (-EFAULT)); \ |
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} |
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#define __put_data_asm_ll32(insn, ptr) \ |
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{ \ |
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__asm__ __volatile__( \ |
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"1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \ |
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"2: "insn("%D2", "4(%3)")" \n" \ |
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"3: \n" \ |
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" .insn \n" \ |
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" .section .fixup,\"ax\" \n" \ |
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"4: li %0, %4 \n" \ |
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" j 3b \n" \ |
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" .previous \n" \ |
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" .section __ex_table,\"a\" \n" \ |
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" " __UA_ADDR " 1b, 4b \n" \ |
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" " __UA_ADDR " 2b, 4b \n" \ |
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" .previous" \ |
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: "=r" (__pu_err) \ |
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: "0" (0), "r" (__pu_val), "r" (ptr), \ |
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"i" (-EFAULT)); \ |
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} |
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extern void __put_user_unknown(void); |
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|
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/* |
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* We're generating jump to subroutines which will be outside the range of |
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* jump instructions |
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*/ |
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#ifdef MODULE |
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#define __MODULE_JAL(destination) \ |
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".set\tnoat\n\t" \ |
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__UA_LA "\t$1, " #destination "\n\t" \ |
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"jalr\t$1\n\t" \ |
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".set\tat\n\t" |
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#else |
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#define __MODULE_JAL(destination) \ |
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"jal\t" #destination "\n\t" |
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#endif |
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|
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#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \ |
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defined(CONFIG_CPU_HAS_PREFETCH)) |
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#define DADDI_SCRATCH "$3" |
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#else |
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#define DADDI_SCRATCH "$0" |
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#endif |
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|
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extern size_t __copy_user(void *__to, const void *__from, size_t __n); |
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|
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#define __invoke_copy_from(func, to, from, n) \ |
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({ \ |
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register void *__cu_to_r __asm__("$4"); \ |
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register const void __user *__cu_from_r __asm__("$5"); \ |
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register long __cu_len_r __asm__("$6"); \ |
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\ |
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__cu_to_r = (to); \ |
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__cu_from_r = (from); \ |
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__cu_len_r = (n); \ |
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__asm__ __volatile__( \ |
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".set\tnoreorder\n\t" \ |
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__MODULE_JAL(func) \ |
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".set\tnoat\n\t" \ |
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__UA_ADDU "\t$1, %1, %2\n\t" \ |
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".set\tat\n\t" \ |
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".set\treorder" \ |
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: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ |
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: \ |
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: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
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DADDI_SCRATCH, "memory"); \ |
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__cu_len_r; \ |
|
}) |
|
|
|
#define __invoke_copy_to(func, to, from, n) \ |
|
({ \ |
|
register void __user *__cu_to_r __asm__("$4"); \ |
|
register const void *__cu_from_r __asm__("$5"); \ |
|
register long __cu_len_r __asm__("$6"); \ |
|
\ |
|
__cu_to_r = (to); \ |
|
__cu_from_r = (from); \ |
|
__cu_len_r = (n); \ |
|
__asm__ __volatile__( \ |
|
__MODULE_JAL(func) \ |
|
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ |
|
: \ |
|
: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
|
DADDI_SCRATCH, "memory"); \ |
|
__cu_len_r; \ |
|
}) |
|
|
|
#define __invoke_copy_from_kernel(to, from, n) \ |
|
__invoke_copy_from(__copy_user, to, from, n) |
|
|
|
#define __invoke_copy_to_kernel(to, from, n) \ |
|
__invoke_copy_to(__copy_user, to, from, n) |
|
|
|
#define ___invoke_copy_in_kernel(to, from, n) \ |
|
__invoke_copy_from(__copy_user, to, from, n) |
|
|
|
#ifndef CONFIG_EVA |
|
#define __invoke_copy_from_user(to, from, n) \ |
|
__invoke_copy_from(__copy_user, to, from, n) |
|
|
|
#define __invoke_copy_to_user(to, from, n) \ |
|
__invoke_copy_to(__copy_user, to, from, n) |
|
|
|
#define ___invoke_copy_in_user(to, from, n) \ |
|
__invoke_copy_from(__copy_user, to, from, n) |
|
|
|
#else |
|
|
|
/* EVA specific functions */ |
|
|
|
extern size_t __copy_from_user_eva(void *__to, const void *__from, |
|
size_t __n); |
|
extern size_t __copy_to_user_eva(void *__to, const void *__from, |
|
size_t __n); |
|
extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n); |
|
|
|
/* |
|
* Source or destination address is in userland. We need to go through |
|
* the TLB |
|
*/ |
|
#define __invoke_copy_from_user(to, from, n) \ |
|
__invoke_copy_from(__copy_from_user_eva, to, from, n) |
|
|
|
#define __invoke_copy_to_user(to, from, n) \ |
|
__invoke_copy_to(__copy_to_user_eva, to, from, n) |
|
|
|
#define ___invoke_copy_in_user(to, from, n) \ |
|
__invoke_copy_from(__copy_in_user_eva, to, from, n) |
|
|
|
#endif /* CONFIG_EVA */ |
|
|
|
static inline unsigned long |
|
raw_copy_to_user(void __user *to, const void *from, unsigned long n) |
|
{ |
|
if (eva_kernel_access()) |
|
return __invoke_copy_to_kernel(to, from, n); |
|
else |
|
return __invoke_copy_to_user(to, from, n); |
|
} |
|
|
|
static inline unsigned long |
|
raw_copy_from_user(void *to, const void __user *from, unsigned long n) |
|
{ |
|
if (eva_kernel_access()) |
|
return __invoke_copy_from_kernel(to, from, n); |
|
else |
|
return __invoke_copy_from_user(to, from, n); |
|
} |
|
|
|
#define INLINE_COPY_FROM_USER |
|
#define INLINE_COPY_TO_USER |
|
|
|
static inline unsigned long |
|
raw_copy_in_user(void __user*to, const void __user *from, unsigned long n) |
|
{ |
|
if (eva_kernel_access()) |
|
return ___invoke_copy_in_kernel(to, from, n); |
|
else |
|
return ___invoke_copy_in_user(to, from, n); |
|
} |
|
|
|
extern __kernel_size_t __bzero_kernel(void __user *addr, __kernel_size_t size); |
|
extern __kernel_size_t __bzero(void __user *addr, __kernel_size_t size); |
|
|
|
/* |
|
* __clear_user: - Zero a block of memory in user space, with less checking. |
|
* @to: Destination address, in user space. |
|
* @n: Number of bytes to zero. |
|
* |
|
* Zero a block of memory in user space. Caller must check |
|
* the specified block with access_ok() before calling this function. |
|
* |
|
* Returns number of bytes that could not be cleared. |
|
* On success, this will be zero. |
|
*/ |
|
static inline __kernel_size_t |
|
__clear_user(void __user *addr, __kernel_size_t size) |
|
{ |
|
__kernel_size_t res; |
|
|
|
#ifdef CONFIG_CPU_MICROMIPS |
|
/* micromips memset / bzero also clobbers t7 & t8 */ |
|
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31" |
|
#else |
|
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31" |
|
#endif /* CONFIG_CPU_MICROMIPS */ |
|
|
|
if (eva_kernel_access()) { |
|
__asm__ __volatile__( |
|
"move\t$4, %1\n\t" |
|
"move\t$5, $0\n\t" |
|
"move\t$6, %2\n\t" |
|
__MODULE_JAL(__bzero_kernel) |
|
"move\t%0, $6" |
|
: "=r" (res) |
|
: "r" (addr), "r" (size) |
|
: bzero_clobbers); |
|
} else { |
|
might_fault(); |
|
__asm__ __volatile__( |
|
"move\t$4, %1\n\t" |
|
"move\t$5, $0\n\t" |
|
"move\t$6, %2\n\t" |
|
__MODULE_JAL(__bzero) |
|
"move\t%0, $6" |
|
: "=r" (res) |
|
: "r" (addr), "r" (size) |
|
: bzero_clobbers); |
|
} |
|
|
|
return res; |
|
} |
|
|
|
#define clear_user(addr,n) \ |
|
({ \ |
|
void __user * __cl_addr = (addr); \ |
|
unsigned long __cl_size = (n); \ |
|
if (__cl_size && access_ok(__cl_addr, __cl_size)) \ |
|
__cl_size = __clear_user(__cl_addr, __cl_size); \ |
|
__cl_size; \ |
|
}) |
|
|
|
extern long __strncpy_from_kernel_asm(char *__to, const char __user *__from, long __len); |
|
extern long __strncpy_from_user_asm(char *__to, const char __user *__from, long __len); |
|
|
|
/* |
|
* strncpy_from_user: - Copy a NUL terminated string from userspace. |
|
* @dst: Destination address, in kernel space. This buffer must be at |
|
* least @count bytes long. |
|
* @src: Source address, in user space. |
|
* @count: Maximum number of bytes to copy, including the trailing NUL. |
|
* |
|
* Copies a NUL-terminated string from userspace to kernel space. |
|
* |
|
* On success, returns the length of the string (not including the trailing |
|
* NUL). |
|
* |
|
* If access to userspace fails, returns -EFAULT (some data may have been |
|
* copied). |
|
* |
|
* If @count is smaller than the length of the string, copies @count bytes |
|
* and returns @count. |
|
*/ |
|
static inline long |
|
strncpy_from_user(char *__to, const char __user *__from, long __len) |
|
{ |
|
long res; |
|
|
|
if (eva_kernel_access()) { |
|
__asm__ __volatile__( |
|
"move\t$4, %1\n\t" |
|
"move\t$5, %2\n\t" |
|
"move\t$6, %3\n\t" |
|
__MODULE_JAL(__strncpy_from_kernel_asm) |
|
"move\t%0, $2" |
|
: "=r" (res) |
|
: "r" (__to), "r" (__from), "r" (__len) |
|
: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); |
|
} else { |
|
might_fault(); |
|
__asm__ __volatile__( |
|
"move\t$4, %1\n\t" |
|
"move\t$5, %2\n\t" |
|
"move\t$6, %3\n\t" |
|
__MODULE_JAL(__strncpy_from_user_asm) |
|
"move\t%0, $2" |
|
: "=r" (res) |
|
: "r" (__to), "r" (__from), "r" (__len) |
|
: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); |
|
} |
|
|
|
return res; |
|
} |
|
|
|
extern long __strnlen_kernel_asm(const char __user *s, long n); |
|
extern long __strnlen_user_asm(const char __user *s, long n); |
|
|
|
/* |
|
* strnlen_user: - Get the size of a string in user space. |
|
* @str: The string to measure. |
|
* |
|
* Context: User context only. This function may sleep if pagefaults are |
|
* enabled. |
|
* |
|
* Get the size of a NUL-terminated string in user space. |
|
* |
|
* Returns the size of the string INCLUDING the terminating NUL. |
|
* On exception, returns 0. |
|
* If the string is too long, returns a value greater than @n. |
|
*/ |
|
static inline long strnlen_user(const char __user *s, long n) |
|
{ |
|
long res; |
|
|
|
might_fault(); |
|
if (eva_kernel_access()) { |
|
__asm__ __volatile__( |
|
"move\t$4, %1\n\t" |
|
"move\t$5, %2\n\t" |
|
__MODULE_JAL(__strnlen_kernel_asm) |
|
"move\t%0, $2" |
|
: "=r" (res) |
|
: "r" (s), "r" (n) |
|
: "$2", "$4", "$5", __UA_t0, "$31"); |
|
} else { |
|
__asm__ __volatile__( |
|
"move\t$4, %1\n\t" |
|
"move\t$5, %2\n\t" |
|
__MODULE_JAL(__strnlen_user_asm) |
|
"move\t%0, $2" |
|
: "=r" (res) |
|
: "r" (s), "r" (n) |
|
: "$2", "$4", "$5", __UA_t0, "$31"); |
|
} |
|
|
|
return res; |
|
} |
|
|
|
#endif /* _ASM_UACCESS_H */
|
|
|