diff options
Diffstat (limited to 'arch/mips/include/asm/uaccess.h')
| -rw-r--r-- | arch/mips/include/asm/uaccess.h | 264 |
1 files changed, 263 insertions, 1 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index b895144d577..09ff5bb1744 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -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 @@ -374,6 +373,269 @@ 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 */ |