Commit 71ec6ccf authored by Ralf Baechle's avatar Ralf Baechle
Browse files

MIPS: Replace use of <asm-generic/uaccess.h> with native implementations.


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 4bacc687
......@@ -13,7 +13,6 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/thread_info.h>
#include <asm-generic/uaccess.h>
/*
* The fs value determines whether argument validity checking should be
......@@ -373,6 +372,269 @@ do { \
extern void __put_user_unknown(void);
/*
* 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.
*
* 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.
*
* 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.
*
* 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.
*
* 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__unalignednocheck((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_user_asm(val, "lb", ptr); break; \
case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \
case 4: __get_user_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_user_unaligned_asm(val, insn, addr) \
{ \
long __gu_tmp; \
\
__asm__ __volatile__( \
"1: " insn " %1, %3 \n" \
"2: \n" \
" .section .fixup,\"ax\" \n" \
"3: li %0, %4 \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: .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_nocheck(x,ptr,size) \
({ \
__typeof__(*(ptr)) __pu_val; \
int __pu_err = 0; \
\
__pu_val = (x); \
switch (size) { \
case 1: __put_user_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; \
} \
__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))) { \
switch (size) { \
case 1: __put_user_asm("sb", __pu_addr); break; \
case 2: __put_user_unaligned_asm("ush", __pu_addr); break; \
case 4: __put_user_unaligned_asm("usw", __pu_addr); break; \
case 8: __PUT_USER_UNALGINED_DW(__pu_addr); break; \
default: __put_user_unaligned_unknown(); break; \
} \
} \
__pu_err; \
})
#define __put_user_unaligned_asm(insn, ptr) \
{ \
__asm__ __volatile__( \
"1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \
"2: \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" \
" .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);
/*
* We're generating jump to subroutines which will be outside the range of
* jump instructions
......
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