1515 lines
42 KiB
C
1515 lines
42 KiB
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.
|
|
*
|
|
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
* Copyright (C) 2007 Maciej W. Rozycki
|
|
* Copyright (C) 2014, Imagination Technologies Ltd.
|
|
*/
|
|
#ifndef _ASM_UACCESS_H
|
|
#define _ASM_UACCESS_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/thread_info.h>
|
|
#include <linux/string.h>
|
|
#include <asm/asm-eva.h>
|
|
#include <asm/extable.h>
|
|
|
|
/*
|
|
* The fs value determines whether argument validity checking should be
|
|
* performed or not. If get_fs() == USER_DS, checking is performed, with
|
|
* get_fs() == KERNEL_DS, checking is bypassed.
|
|
*
|
|
* For historical reasons, these macros are grossly misnamed.
|
|
*/
|
|
#ifdef CONFIG_32BIT
|
|
|
|
#ifdef CONFIG_KVM_GUEST
|
|
#define __UA_LIMIT 0x40000000UL
|
|
#else
|
|
#define __UA_LIMIT 0x80000000UL
|
|
#endif
|
|
|
|
#define __UA_ADDR ".word"
|
|
#define __UA_LA "la"
|
|
#define __UA_ADDU "addu"
|
|
#define __UA_t0 "$8"
|
|
#define __UA_t1 "$9"
|
|
|
|
#endif /* CONFIG_32BIT */
|
|
|
|
#ifdef CONFIG_64BIT
|
|
|
|
extern u64 __ua_limit;
|
|
|
|
#define __UA_LIMIT __ua_limit
|
|
|
|
#define __UA_ADDR ".dword"
|
|
#define __UA_LA "dla"
|
|
#define __UA_ADDU "daddu"
|
|
#define __UA_t0 "$12"
|
|
#define __UA_t1 "$13"
|
|
|
|
#endif /* CONFIG_64BIT */
|
|
|
|
/*
|
|
* USER_DS is a bitmask that has the bits set that may not be set in a valid
|
|
* userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but
|
|
* the arithmetic we're doing only works if the limit is a power of two, so
|
|
* we use 0x80000000 here on 32-bit kernels. If a process passes an invalid
|
|
* address in this range it's the process's problem, not ours :-)
|
|
*/
|
|
|
|
#ifdef CONFIG_KVM_GUEST
|
|
#define KERNEL_DS ((mm_segment_t) { 0x80000000UL })
|
|
#define USER_DS ((mm_segment_t) { 0xC0000000UL })
|
|
#else
|
|
#define KERNEL_DS ((mm_segment_t) { 0UL })
|
|
#define USER_DS ((mm_segment_t) { __UA_LIMIT })
|
|
#endif
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
#define get_ds() (KERNEL_DS)
|
|
#define get_fs() (current_thread_info()->addr_limit)
|
|
#define set_fs(x) (current_thread_info()->addr_limit = (x))
|
|
|
|
#define segment_eq(a, b) ((a).seg == (b).seg)
|
|
|
|
/*
|
|
* eva_kernel_access() - determine whether kernel memory access on an EVA system
|
|
*
|
|
* Determines whether memory accesses should be performed to kernel memory
|
|
* on a system using Extended Virtual Addressing (EVA).
|
|
*
|
|
* Return: true if a kernel memory access on an EVA system, else false.
|
|
*/
|
|
static inline bool eva_kernel_access(void)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_EVA))
|
|
return false;
|
|
|
|
return segment_eq(get_fs(), get_ds());
|
|
}
|
|
|
|
/*
|
|
* Is a address valid? This does a straightforward calculation rather
|
|
* than tests.
|
|
*
|
|
* Address valid if:
|
|
* - "addr" doesn't have any high-bits set
|
|
* - AND "size" doesn't have any high-bits set
|
|
* - AND "addr+size" doesn't have any high-bits set
|
|
* - OR we are in kernel mode.
|
|
*
|
|
* __ua_size() is a trick to avoid runtime checking of positive constant
|
|
* sizes; for those we already know at compile time that the size is ok.
|
|
*/
|
|
#define __ua_size(size) \
|
|
((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
|
|
|
|
/*
|
|
* access_ok: - Checks if a user space pointer is valid
|
|
* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
|
|
* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
|
|
* to write to a block, it is always safe to read from it.
|
|
* @addr: User space pointer to start of block to check
|
|
* @size: Size of block to check
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* Checks if a pointer to a block of memory in user space is valid.
|
|
*
|
|
* Returns true (nonzero) if the memory block may be valid, false (zero)
|
|
* if it is definitely invalid.
|
|
*
|
|
* Note that, depending on architecture, this function probably just
|
|
* checks that the pointer is in the user space range - after calling
|
|
* this function, memory access functions may still return -EFAULT.
|
|
*/
|
|
|
|
#define __access_mask get_fs().seg
|
|
|
|
#define __access_ok(addr, size, mask) \
|
|
({ \
|
|
unsigned long __addr = (unsigned long) (addr); \
|
|
unsigned long __size = size; \
|
|
unsigned long __mask = mask; \
|
|
unsigned long __ok; \
|
|
\
|
|
__chk_user_ptr(addr); \
|
|
__ok = (signed long)(__mask & (__addr | (__addr + __size) | \
|
|
__ua_size(__size))); \
|
|
__ok == 0; \
|
|
})
|
|
|
|
#define access_ok(type, addr, size) \
|
|
likely(__access_ok((addr), (size), __access_mask))
|
|
|
|
/*
|
|
* put_user: - Write a simple value into user space.
|
|
* @x: Value to copy to user space.
|
|
* @ptr: Destination address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple value from kernel space to user
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
|
|
* to the result of dereferencing @ptr.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
*/
|
|
#define put_user(x,ptr) \
|
|
__put_user_check((x), (ptr), sizeof(*(ptr)))
|
|
|
|
/*
|
|
* get_user: - Get a simple variable from user space.
|
|
* @x: Variable to store result.
|
|
* @ptr: Source address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple variable from user space to kernel
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and the result of
|
|
* dereferencing @ptr must be assignable to @x without a cast.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
* On error, the variable @x is set to zero.
|
|
*/
|
|
#define get_user(x,ptr) \
|
|
__get_user_check((x), (ptr), sizeof(*(ptr)))
|
|
|
|
/*
|
|
* __put_user: - Write a simple value into user space, with less checking.
|
|
* @x: Value to copy to user space.
|
|
* @ptr: Destination address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple value from kernel space to user
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
|
|
* to the result of dereferencing @ptr.
|
|
*
|
|
* Caller must check the pointer with access_ok() before calling this
|
|
* function.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
*/
|
|
#define __put_user(x,ptr) \
|
|
__put_user_nocheck((x), (ptr), sizeof(*(ptr)))
|
|
|
|
/*
|
|
* __get_user: - Get a simple variable from user space, with less checking.
|
|
* @x: Variable to store result.
|
|
* @ptr: Source address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple variable from user space to kernel
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and the result of
|
|
* dereferencing @ptr must be assignable to @x without a cast.
|
|
*
|
|
* Caller must check the pointer with access_ok() before calling this
|
|
* function.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
* On error, the variable @x is set to zero.
|
|
*/
|
|
#define __get_user(x,ptr) \
|
|
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
|
|
|
|
struct __large_struct { unsigned long buf[100]; };
|
|
#define __m(x) (*(struct __large_struct __user *)(x))
|
|
|
|
/*
|
|
* Yuck. We need two variants, one for 64bit operation and one
|
|
* for 32 bit mode and old iron.
|
|
*/
|
|
#ifndef CONFIG_EVA
|
|
#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
|
|
#else
|
|
/*
|
|
* Kernel specific functions for EVA. We need to use normal load instructions
|
|
* to read data from kernel when operating in EVA mode. We use these macros to
|
|
* avoid redefining __get_user_asm for EVA.
|
|
*/
|
|
#undef _loadd
|
|
#undef _loadw
|
|
#undef _loadh
|
|
#undef _loadb
|
|
#ifdef CONFIG_32BIT
|
|
#define _loadd _loadw
|
|
#else
|
|
#define _loadd(reg, addr) "ld " reg ", " addr
|
|
#endif
|
|
#define _loadw(reg, addr) "lw " reg ", " addr
|
|
#define _loadh(reg, addr) "lh " reg ", " addr
|
|
#define _loadb(reg, addr) "lb " reg ", " addr
|
|
|
|
#define __get_kernel_common(val, size, ptr) \
|
|
do { \
|
|
switch (size) { \
|
|
case 1: __get_data_asm(val, _loadb, ptr); break; \
|
|
case 2: __get_data_asm(val, _loadh, ptr); break; \
|
|
case 4: __get_data_asm(val, _loadw, ptr); break; \
|
|
case 8: __GET_DW(val, _loadd, ptr); break; \
|
|
default: __get_user_unknown(); break; \
|
|
} \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_32BIT
|
|
#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr)
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
|
|
#endif
|
|
|
|
extern void __get_user_unknown(void);
|
|
|
|
#define __get_user_common(val, size, ptr) \
|
|
do { \
|
|
switch (size) { \
|
|
case 1: __get_data_asm(val, user_lb, ptr); break; \
|
|
case 2: __get_data_asm(val, user_lh, ptr); break; \
|
|
case 4: __get_data_asm(val, user_lw, ptr); break; \
|
|
case 8: __GET_DW(val, user_ld, ptr); break; \
|
|
default: __get_user_unknown(); break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __get_user_nocheck(x, ptr, size) \
|
|
({ \
|
|
int __gu_err; \
|
|
\
|
|
if (eva_kernel_access()) { \
|
|
__get_kernel_common((x), size, ptr); \
|
|
} else { \
|
|
__chk_user_ptr(ptr); \
|
|
__get_user_common((x), size, ptr); \
|
|
} \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user_check(x, ptr, size) \
|
|
({ \
|
|
int __gu_err = -EFAULT; \
|
|
const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
|
|
\
|
|
might_fault(); \
|
|
if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) { \
|
|
if (eva_kernel_access()) \
|
|
__get_kernel_common((x), size, __gu_ptr); \
|
|
else \
|
|
__get_user_common((x), size, __gu_ptr); \
|
|
} else \
|
|
(x) = 0; \
|
|
\
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_data_asm(val, insn, addr) \
|
|
{ \
|
|
long __gu_tmp; \
|
|
\
|
|
__asm__ __volatile__( \
|
|
"1: "insn("%1", "%3")" \n" \
|
|
"2: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"3: li %0, %4 \n" \
|
|
" move %1, $0 \n" \
|
|
" j 2b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" "__UA_ADDR "\t1b, 3b \n" \
|
|
" .previous \n" \
|
|
: "=r" (__gu_err), "=r" (__gu_tmp) \
|
|
: "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
|
|
\
|
|
(val) = (__typeof__(*(addr))) __gu_tmp; \
|
|
}
|
|
|
|
/*
|
|
* Get a long long 64 using 32 bit registers.
|
|
*/
|
|
#define __get_data_asm_ll32(val, insn, addr) \
|
|
{ \
|
|
union { \
|
|
unsigned long long l; \
|
|
__typeof__(*(addr)) t; \
|
|
} __gu_tmp; \
|
|
\
|
|
__asm__ __volatile__( \
|
|
"1: " insn("%1", "(%3)")" \n" \
|
|
"2: " insn("%D1", "4(%3)")" \n" \
|
|
"3: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"4: li %0, %4 \n" \
|
|
" move %1, $0 \n" \
|
|
" move %D1, $0 \n" \
|
|
" j 3b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 4b \n" \
|
|
" " __UA_ADDR " 2b, 4b \n" \
|
|
" .previous \n" \
|
|
: "=r" (__gu_err), "=&r" (__gu_tmp.l) \
|
|
: "0" (0), "r" (addr), "i" (-EFAULT)); \
|
|
\
|
|
(val) = __gu_tmp.t; \
|
|
}
|
|
|
|
#ifndef CONFIG_EVA
|
|
#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
|
|
#else
|
|
/*
|
|
* Kernel specific functions for EVA. We need to use normal load instructions
|
|
* to read data from kernel when operating in EVA mode. We use these macros to
|
|
* avoid redefining __get_data_asm for EVA.
|
|
*/
|
|
#undef _stored
|
|
#undef _storew
|
|
#undef _storeh
|
|
#undef _storeb
|
|
#ifdef CONFIG_32BIT
|
|
#define _stored _storew
|
|
#else
|
|
#define _stored(reg, addr) "ld " reg ", " addr
|
|
#endif
|
|
|
|
#define _storew(reg, addr) "sw " reg ", " addr
|
|
#define _storeh(reg, addr) "sh " reg ", " addr
|
|
#define _storeb(reg, addr) "sb " reg ", " addr
|
|
|
|
#define __put_kernel_common(ptr, size) \
|
|
do { \
|
|
switch (size) { \
|
|
case 1: __put_data_asm(_storeb, ptr); break; \
|
|
case 2: __put_data_asm(_storeh, ptr); break; \
|
|
case 4: __put_data_asm(_storew, ptr); break; \
|
|
case 8: __PUT_DW(_stored, ptr); break; \
|
|
default: __put_user_unknown(); break; \
|
|
} \
|
|
} while(0)
|
|
#endif
|
|
|
|
/*
|
|
* Yuck. We need two variants, one for 64bit operation and one
|
|
* for 32 bit mode and old iron.
|
|
*/
|
|
#ifdef CONFIG_32BIT
|
|
#define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr)
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
|
|
#endif
|
|
|
|
#define __put_user_common(ptr, size) \
|
|
do { \
|
|
switch (size) { \
|
|
case 1: __put_data_asm(user_sb, ptr); break; \
|
|
case 2: __put_data_asm(user_sh, ptr); break; \
|
|
case 4: __put_data_asm(user_sw, ptr); break; \
|
|
case 8: __PUT_DW(user_sd, ptr); break; \
|
|
default: __put_user_unknown(); break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __put_user_nocheck(x, ptr, size) \
|
|
({ \
|
|
__typeof__(*(ptr)) __pu_val; \
|
|
int __pu_err = 0; \
|
|
\
|
|
__pu_val = (x); \
|
|
if (eva_kernel_access()) { \
|
|
__put_kernel_common(ptr, size); \
|
|
} else { \
|
|
__chk_user_ptr(ptr); \
|
|
__put_user_common(ptr, size); \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_check(x, ptr, size) \
|
|
({ \
|
|
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
|
|
__typeof__(*(ptr)) __pu_val = (x); \
|
|
int __pu_err = -EFAULT; \
|
|
\
|
|
might_fault(); \
|
|
if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
|
|
if (eva_kernel_access()) \
|
|
__put_kernel_common(__pu_addr, size); \
|
|
else \
|
|
__put_user_common(__pu_addr, size); \
|
|
} \
|
|
\
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_data_asm(insn, ptr) \
|
|
{ \
|
|
__asm__ __volatile__( \
|
|
"1: "insn("%z2", "%3")" # __put_data_asm \n" \
|
|
"2: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"3: li %0, %4 \n" \
|
|
" j 2b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 3b \n" \
|
|
" .previous \n" \
|
|
: "=r" (__pu_err) \
|
|
: "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
|
|
"i" (-EFAULT)); \
|
|
}
|
|
|
|
#define __put_data_asm_ll32(insn, ptr) \
|
|
{ \
|
|
__asm__ __volatile__( \
|
|
"1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \
|
|
"2: "insn("%D2", "4(%3)")" \n" \
|
|
"3: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"4: li %0, %4 \n" \
|
|
" j 3b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 4b \n" \
|
|
" " __UA_ADDR " 2b, 4b \n" \
|
|
" .previous" \
|
|
: "=r" (__pu_err) \
|
|
: "0" (0), "r" (__pu_val), "r" (ptr), \
|
|
"i" (-EFAULT)); \
|
|
}
|
|
|
|
extern void __put_user_unknown(void);
|
|
|
|
/*
|
|
* ul{b,h,w} are macros and there are no equivalent macros for EVA.
|
|
* EVA unaligned access is handled in the ADE exception handler.
|
|
*/
|
|
#ifndef CONFIG_EVA
|
|
/*
|
|
* put_user_unaligned: - Write a simple value into user space.
|
|
* @x: Value to copy to user space.
|
|
* @ptr: Destination address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple value from kernel space to user
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
|
|
* to the result of dereferencing @ptr.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
*/
|
|
#define put_user_unaligned(x,ptr) \
|
|
__put_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
|
|
|
|
/*
|
|
* get_user_unaligned: - Get a simple variable from user space.
|
|
* @x: Variable to store result.
|
|
* @ptr: Source address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple variable from user space to kernel
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and the result of
|
|
* dereferencing @ptr must be assignable to @x without a cast.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
* On error, the variable @x is set to zero.
|
|
*/
|
|
#define get_user_unaligned(x,ptr) \
|
|
__get_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
|
|
|
|
/*
|
|
* __put_user_unaligned: - Write a simple value into user space, with less checking.
|
|
* @x: Value to copy to user space.
|
|
* @ptr: Destination address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple value from kernel space to user
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
|
|
* to the result of dereferencing @ptr.
|
|
*
|
|
* Caller must check the pointer with access_ok() before calling this
|
|
* function.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
*/
|
|
#define __put_user_unaligned(x,ptr) \
|
|
__put_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr)))
|
|
|
|
/*
|
|
* __get_user_unaligned: - Get a simple variable from user space, with less checking.
|
|
* @x: Variable to store result.
|
|
* @ptr: Source address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple variable from user space to kernel
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and the result of
|
|
* dereferencing @ptr must be assignable to @x without a cast.
|
|
*
|
|
* Caller must check the pointer with access_ok() before calling this
|
|
* function.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
* On error, the variable @x is set to zero.
|
|
*/
|
|
#define __get_user_unaligned(x,ptr) \
|
|
__get_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr)))
|
|
|
|
/*
|
|
* Yuck. We need two variants, one for 64bit operation and one
|
|
* for 32 bit mode and old iron.
|
|
*/
|
|
#ifdef CONFIG_32BIT
|
|
#define __GET_USER_UNALIGNED_DW(val, ptr) \
|
|
__get_user_unaligned_asm_ll32(val, ptr)
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
#define __GET_USER_UNALIGNED_DW(val, ptr) \
|
|
__get_user_unaligned_asm(val, "uld", ptr)
|
|
#endif
|
|
|
|
extern void __get_user_unaligned_unknown(void);
|
|
|
|
#define __get_user_unaligned_common(val, size, ptr) \
|
|
do { \
|
|
switch (size) { \
|
|
case 1: __get_data_asm(val, "lb", ptr); break; \
|
|
case 2: __get_data_unaligned_asm(val, "ulh", ptr); break; \
|
|
case 4: __get_data_unaligned_asm(val, "ulw", ptr); break; \
|
|
case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \
|
|
default: __get_user_unaligned_unknown(); break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __get_user_unaligned_nocheck(x,ptr,size) \
|
|
({ \
|
|
int __gu_err; \
|
|
\
|
|
__get_user_unaligned_common((x), size, ptr); \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user_unaligned_check(x,ptr,size) \
|
|
({ \
|
|
int __gu_err = -EFAULT; \
|
|
const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
|
|
\
|
|
if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
|
|
__get_user_unaligned_common((x), size, __gu_ptr); \
|
|
\
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_data_unaligned_asm(val, insn, addr) \
|
|
{ \
|
|
long __gu_tmp; \
|
|
\
|
|
__asm__ __volatile__( \
|
|
"1: " insn " %1, %3 \n" \
|
|
"2: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"3: li %0, %4 \n" \
|
|
" move %1, $0 \n" \
|
|
" j 2b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" "__UA_ADDR "\t1b, 3b \n" \
|
|
" "__UA_ADDR "\t1b + 4, 3b \n" \
|
|
" .previous \n" \
|
|
: "=r" (__gu_err), "=r" (__gu_tmp) \
|
|
: "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
|
|
\
|
|
(val) = (__typeof__(*(addr))) __gu_tmp; \
|
|
}
|
|
|
|
/*
|
|
* Get a long long 64 using 32 bit registers.
|
|
*/
|
|
#define __get_user_unaligned_asm_ll32(val, addr) \
|
|
{ \
|
|
unsigned long long __gu_tmp; \
|
|
\
|
|
__asm__ __volatile__( \
|
|
"1: ulw %1, (%3) \n" \
|
|
"2: ulw %D1, 4(%3) \n" \
|
|
" move %0, $0 \n" \
|
|
"3: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"4: li %0, %4 \n" \
|
|
" move %1, $0 \n" \
|
|
" move %D1, $0 \n" \
|
|
" j 3b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 4b \n" \
|
|
" " __UA_ADDR " 1b + 4, 4b \n" \
|
|
" " __UA_ADDR " 2b, 4b \n" \
|
|
" " __UA_ADDR " 2b + 4, 4b \n" \
|
|
" .previous \n" \
|
|
: "=r" (__gu_err), "=&r" (__gu_tmp) \
|
|
: "0" (0), "r" (addr), "i" (-EFAULT)); \
|
|
(val) = (__typeof__(*(addr))) __gu_tmp; \
|
|
}
|
|
|
|
/*
|
|
* Yuck. We need two variants, one for 64bit operation and one
|
|
* for 32 bit mode and old iron.
|
|
*/
|
|
#ifdef CONFIG_32BIT
|
|
#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm_ll32(ptr)
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr)
|
|
#endif
|
|
|
|
#define __put_user_unaligned_common(ptr, size) \
|
|
do { \
|
|
switch (size) { \
|
|
case 1: __put_data_asm("sb", ptr); break; \
|
|
case 2: __put_user_unaligned_asm("ush", ptr); break; \
|
|
case 4: __put_user_unaligned_asm("usw", ptr); break; \
|
|
case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \
|
|
default: __put_user_unaligned_unknown(); break; \
|
|
} while (0)
|
|
|
|
#define __put_user_unaligned_nocheck(x,ptr,size) \
|
|
({ \
|
|
__typeof__(*(ptr)) __pu_val; \
|
|
int __pu_err = 0; \
|
|
\
|
|
__pu_val = (x); \
|
|
__put_user_unaligned_common(ptr, size); \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_unaligned_check(x,ptr,size) \
|
|
({ \
|
|
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
|
|
__typeof__(*(ptr)) __pu_val = (x); \
|
|
int __pu_err = -EFAULT; \
|
|
\
|
|
if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
|
|
__put_user_unaligned_common(__pu_addr, size); \
|
|
\
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_unaligned_asm(insn, ptr) \
|
|
{ \
|
|
__asm__ __volatile__( \
|
|
"1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \
|
|
"2: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"3: li %0, %4 \n" \
|
|
" j 2b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 3b \n" \
|
|
" .previous \n" \
|
|
: "=r" (__pu_err) \
|
|
: "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
|
|
"i" (-EFAULT)); \
|
|
}
|
|
|
|
#define __put_user_unaligned_asm_ll32(ptr) \
|
|
{ \
|
|
__asm__ __volatile__( \
|
|
"1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \
|
|
"2: sw %D2, 4(%3) \n" \
|
|
"3: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"4: li %0, %4 \n" \
|
|
" j 3b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 4b \n" \
|
|
" " __UA_ADDR " 1b + 4, 4b \n" \
|
|
" " __UA_ADDR " 2b, 4b \n" \
|
|
" " __UA_ADDR " 2b + 4, 4b \n" \
|
|
" .previous" \
|
|
: "=r" (__pu_err) \
|
|
: "0" (0), "r" (__pu_val), "r" (ptr), \
|
|
"i" (-EFAULT)); \
|
|
}
|
|
|
|
extern void __put_user_unaligned_unknown(void);
|
|
#endif
|
|
|
|
/*
|
|
* We're generating jump to subroutines which will be outside the range of
|
|
* jump instructions
|
|
*/
|
|
#ifdef MODULE
|
|
#define __MODULE_JAL(destination) \
|
|
".set\tnoat\n\t" \
|
|
__UA_LA "\t$1, " #destination "\n\t" \
|
|
"jalr\t$1\n\t" \
|
|
".set\tat\n\t"
|
|
#else
|
|
#define __MODULE_JAL(destination) \
|
|
"jal\t" #destination "\n\t"
|
|
#endif
|
|
|
|
#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \
|
|
defined(CONFIG_CPU_HAS_PREFETCH))
|
|
#define DADDI_SCRATCH "$3"
|
|
#else
|
|
#define DADDI_SCRATCH "$0"
|
|
#endif
|
|
|
|
extern size_t __copy_user(void *__to, const void *__from, size_t __n);
|
|
|
|
#ifndef CONFIG_EVA
|
|
#define __invoke_copy_to_user(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(__copy_user) \
|
|
: "+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_to_kernel(to, from, n) \
|
|
__invoke_copy_to_user(to, from, n)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* __copy_to_user: - Copy a block of data into user space, with less checking.
|
|
* @to: Destination address, in user space.
|
|
* @from: Source address, in kernel space.
|
|
* @n: Number of bytes to copy.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* Copy data from kernel space to user space. Caller must check
|
|
* the specified block with access_ok() before calling this function.
|
|
*
|
|
* Returns number of bytes that could not be copied.
|
|
* On success, this will be zero.
|
|
*/
|
|
#define __copy_to_user(to, from, n) \
|
|
({ \
|
|
void __user *__cu_to; \
|
|
const void *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
\
|
|
check_object_size(__cu_from, __cu_len, true); \
|
|
might_fault(); \
|
|
\
|
|
if (eva_kernel_access()) \
|
|
__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
else \
|
|
__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
__cu_len; \
|
|
})
|
|
|
|
extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
|
|
|
|
#define __copy_to_user_inatomic(to, from, n) \
|
|
({ \
|
|
void __user *__cu_to; \
|
|
const void *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
\
|
|
check_object_size(__cu_from, __cu_len, true); \
|
|
\
|
|
if (eva_kernel_access()) \
|
|
__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
else \
|
|
__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
__cu_len; \
|
|
})
|
|
|
|
#define __copy_from_user_inatomic(to, from, n) \
|
|
({ \
|
|
void *__cu_to; \
|
|
const void __user *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
\
|
|
check_object_size(__cu_to, __cu_len, false); \
|
|
\
|
|
if (eva_kernel_access()) \
|
|
__cu_len = __invoke_copy_from_kernel_inatomic(__cu_to, \
|
|
__cu_from,\
|
|
__cu_len);\
|
|
else \
|
|
__cu_len = __invoke_copy_from_user_inatomic(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
__cu_len; \
|
|
})
|
|
|
|
/*
|
|
* copy_to_user: - Copy a block of data into user space.
|
|
* @to: Destination address, in user space.
|
|
* @from: Source address, in kernel space.
|
|
* @n: Number of bytes to copy.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* Copy data from kernel space to user space.
|
|
*
|
|
* Returns number of bytes that could not be copied.
|
|
* On success, this will be zero.
|
|
*/
|
|
#define copy_to_user(to, from, n) \
|
|
({ \
|
|
void __user *__cu_to; \
|
|
const void *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
\
|
|
check_object_size(__cu_from, __cu_len, true); \
|
|
\
|
|
if (eva_kernel_access()) { \
|
|
__cu_len = __invoke_copy_to_kernel(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
} else { \
|
|
if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
|
|
might_fault(); \
|
|
__cu_len = __invoke_copy_to_user(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
} \
|
|
} \
|
|
__cu_len; \
|
|
})
|
|
|
|
#ifndef CONFIG_EVA
|
|
|
|
#define __invoke_copy_from_user(to, from, n) \
|
|
({ \
|
|
register void *__cu_to_r __asm__("$4"); \
|
|
register const void __user *__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__( \
|
|
".set\tnoreorder\n\t" \
|
|
__MODULE_JAL(__copy_user) \
|
|
".set\tnoat\n\t" \
|
|
__UA_ADDU "\t$1, %1, %2\n\t" \
|
|
".set\tat\n\t" \
|
|
".set\treorder" \
|
|
: "+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_user(to, from, n)
|
|
|
|
/* For userland <-> userland operations */
|
|
#define ___invoke_copy_in_user(to, from, n) \
|
|
__invoke_copy_from_user(to, from, n)
|
|
|
|
/* For kernel <-> kernel operations */
|
|
#define ___invoke_copy_in_kernel(to, from, n) \
|
|
__invoke_copy_from_user(to, from, n)
|
|
|
|
#define __invoke_copy_from_user_inatomic(to, from, n) \
|
|
({ \
|
|
register void *__cu_to_r __asm__("$4"); \
|
|
register const void __user *__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__( \
|
|
".set\tnoreorder\n\t" \
|
|
__MODULE_JAL(__copy_user_inatomic) \
|
|
".set\tnoat\n\t" \
|
|
__UA_ADDU "\t$1, %1, %2\n\t" \
|
|
".set\tat\n\t" \
|
|
".set\treorder" \
|
|
: "+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_inatomic(to, from, n) \
|
|
__invoke_copy_from_user_inatomic(to, from, n) \
|
|
|
|
#else
|
|
|
|
/* EVA specific functions */
|
|
|
|
extern size_t __copy_user_inatomic_eva(void *__to, const void *__from,
|
|
size_t __n);
|
|
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);
|
|
|
|
#define __invoke_copy_from_user_eva_generic(to, from, n, func_ptr) \
|
|
({ \
|
|
register void *__cu_to_r __asm__("$4"); \
|
|
register const void __user *__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__( \
|
|
".set\tnoreorder\n\t" \
|
|
__MODULE_JAL(func_ptr) \
|
|
".set\tnoat\n\t" \
|
|
__UA_ADDU "\t$1, %1, %2\n\t" \
|
|
".set\tat\n\t" \
|
|
".set\treorder" \
|
|
: "+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_to_user_eva_generic(to, from, n, func_ptr) \
|
|
({ \
|
|
register void *__cu_to_r __asm__("$4"); \
|
|
register const void __user *__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_ptr) \
|
|
: "+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; \
|
|
})
|
|
|
|
/*
|
|
* 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_user_eva_generic(to, from, n, __copy_from_user_eva)
|
|
|
|
#define __invoke_copy_from_user_inatomic(to, from, n) \
|
|
__invoke_copy_from_user_eva_generic(to, from, n, \
|
|
__copy_user_inatomic_eva)
|
|
|
|
#define __invoke_copy_to_user(to, from, n) \
|
|
__invoke_copy_to_user_eva_generic(to, from, n, __copy_to_user_eva)
|
|
|
|
#define ___invoke_copy_in_user(to, from, n) \
|
|
__invoke_copy_from_user_eva_generic(to, from, n, __copy_in_user_eva)
|
|
|
|
/*
|
|
* Source or destination address in the kernel. We are not going through
|
|
* the TLB
|
|
*/
|
|
#define __invoke_copy_from_kernel(to, from, n) \
|
|
__invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
|
|
|
|
#define __invoke_copy_from_kernel_inatomic(to, from, n) \
|
|
__invoke_copy_from_user_eva_generic(to, from, n, __copy_user_inatomic)
|
|
|
|
#define __invoke_copy_to_kernel(to, from, n) \
|
|
__invoke_copy_to_user_eva_generic(to, from, n, __copy_user)
|
|
|
|
#define ___invoke_copy_in_kernel(to, from, n) \
|
|
__invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
|
|
|
|
#endif /* CONFIG_EVA */
|
|
|
|
/*
|
|
* __copy_from_user: - Copy a block of data from user space, with less checking.
|
|
* @to: Destination address, in kernel space.
|
|
* @from: Source address, in user space.
|
|
* @n: Number of bytes to copy.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* Copy data from user space to kernel space. Caller must check
|
|
* the specified block with access_ok() before calling this function.
|
|
*
|
|
* Returns number of bytes that could not be copied.
|
|
* On success, this will be zero.
|
|
*
|
|
* If some data could not be copied, this function will pad the copied
|
|
* data to the requested size using zero bytes.
|
|
*/
|
|
#define __copy_from_user(to, from, n) \
|
|
({ \
|
|
void *__cu_to; \
|
|
const void __user *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
\
|
|
check_object_size(__cu_to, __cu_len, false); \
|
|
\
|
|
if (eva_kernel_access()) { \
|
|
__cu_len = __invoke_copy_from_kernel(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
} else { \
|
|
might_fault(); \
|
|
__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
} \
|
|
__cu_len; \
|
|
})
|
|
|
|
/*
|
|
* copy_from_user: - Copy a block of data from user space.
|
|
* @to: Destination address, in kernel space.
|
|
* @from: Source address, in user space.
|
|
* @n: Number of bytes to copy.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* Copy data from user space to kernel space.
|
|
*
|
|
* Returns number of bytes that could not be copied.
|
|
* On success, this will be zero.
|
|
*
|
|
* If some data could not be copied, this function will pad the copied
|
|
* data to the requested size using zero bytes.
|
|
*/
|
|
#define copy_from_user(to, from, n) \
|
|
({ \
|
|
void *__cu_to; \
|
|
const void __user *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
\
|
|
check_object_size(__cu_to, __cu_len, false); \
|
|
\
|
|
if (eva_kernel_access()) { \
|
|
__cu_len = __invoke_copy_from_kernel(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
} else { \
|
|
if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
|
|
might_fault(); \
|
|
__cu_len = __invoke_copy_from_user(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
} else { \
|
|
memset(__cu_to, 0, __cu_len); \
|
|
} \
|
|
} \
|
|
__cu_len; \
|
|
})
|
|
|
|
#define __copy_in_user(to, from, n) \
|
|
({ \
|
|
void __user *__cu_to; \
|
|
const void __user *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
if (eva_kernel_access()) { \
|
|
__cu_len = ___invoke_copy_in_kernel(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
} else { \
|
|
might_fault(); \
|
|
__cu_len = ___invoke_copy_in_user(__cu_to, __cu_from, \
|
|
__cu_len); \
|
|
} \
|
|
__cu_len; \
|
|
})
|
|
|
|
#define copy_in_user(to, from, n) \
|
|
({ \
|
|
void __user *__cu_to; \
|
|
const void __user *__cu_from; \
|
|
long __cu_len; \
|
|
\
|
|
__cu_to = (to); \
|
|
__cu_from = (from); \
|
|
__cu_len = (n); \
|
|
if (eva_kernel_access()) { \
|
|
__cu_len = ___invoke_copy_in_kernel(__cu_to,__cu_from, \
|
|
__cu_len); \
|
|
} else { \
|
|
if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) &&\
|
|
access_ok(VERIFY_WRITE, __cu_to, __cu_len))) {\
|
|
might_fault(); \
|
|
__cu_len = ___invoke_copy_in_user(__cu_to, \
|
|
__cu_from, \
|
|
__cu_len); \
|
|
} \
|
|
} \
|
|
__cu_len; \
|
|
})
|
|
|
|
/*
|
|
* __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(VERIFY_WRITE, \
|
|
__cl_addr, __cl_size)) \
|
|
__cl_size = __clear_user(__cl_addr, __cl_size); \
|
|
__cl_size; \
|
|
})
|
|
|
|
/*
|
|
* __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
|
|
* @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.
|
|
* Caller must check the specified block with access_ok() before calling
|
|
* this function.
|
|
*
|
|
* 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_nocheck_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_nocheck_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (__to), "r" (__from), "r" (__len)
|
|
: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* strlen_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 there is a limit on the length of a valid string, you may wish to
|
|
* consider using strnlen_user() instead.
|
|
*/
|
|
static inline long strlen_user(const char __user *s)
|
|
{
|
|
long res;
|
|
|
|
if (eva_kernel_access()) {
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
__MODULE_JAL(__strlen_kernel_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s)
|
|
: "$2", "$4", __UA_t0, "$31");
|
|
} else {
|
|
might_fault();
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
__MODULE_JAL(__strlen_user_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s)
|
|
: "$2", "$4", __UA_t0, "$31");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
|
|
static inline long __strnlen_user(const char __user *s, long n)
|
|
{
|
|
long res;
|
|
|
|
if (eva_kernel_access()) {
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
__MODULE_JAL(__strnlen_kernel_nocheck_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s), "r" (n)
|
|
: "$2", "$4", "$5", __UA_t0, "$31");
|
|
} else {
|
|
might_fault();
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
__MODULE_JAL(__strnlen_user_nocheck_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s), "r" (n)
|
|
: "$2", "$4", "$5", __UA_t0, "$31");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* 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 */
|