aboutsummaryrefslogtreecommitdiff
path: root/include/asm-mips/uaccess.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-mips/uaccess.h')
-rw-r--r--include/asm-mips/uaccess.h852
1 files changed, 0 insertions, 852 deletions
diff --git a/include/asm-mips/uaccess.h b/include/asm-mips/uaccess.h
deleted file mode 100644
index b895144d577..00000000000
--- a/include/asm-mips/uaccess.h
+++ /dev/null
@@ -1,852 +0,0 @@
-/*
- * 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
- */
-#ifndef _ASM_UACCESS_H
-#define _ASM_UACCESS_H
-
-#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
- * 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
-
-#define __UA_LIMIT 0x80000000UL
-
-#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
-
-#define __UA_LIMIT (- TASK_SIZE)
-
-#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 :-)
- */
-
-#define KERNEL_DS ((mm_segment_t) { 0UL })
-#define USER_DS ((mm_segment_t) { __UA_LIMIT })
-
-#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)
-
-
-/*
- * Is a address valid? This does a straighforward 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.
- *
- * 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) \
- (((signed long)((mask) & ((addr) | ((addr) + (size)) | __ua_size(size)))) == 0)
-
-#define access_ok(type, addr, size) \
- likely(__access_ok((unsigned long)(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.
- *
- * 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.
- *
- * 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.
- *
- * 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.
- *
- * 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.
- */
-#ifdef CONFIG_32BIT
-#define __GET_USER_DW(val, ptr) __get_user_asm_ll32(val, ptr)
-#endif
-#ifdef CONFIG_64BIT
-#define __GET_USER_DW(val, ptr) __get_user_asm(val, "ld", ptr)
-#endif
-
-extern void __get_user_unknown(void);
-
-#define __get_user_common(val, size, ptr) \
-do { \
- switch (size) { \
- case 1: __get_user_asm(val, "lb", ptr); break; \
- case 2: __get_user_asm(val, "lh", ptr); break; \
- case 4: __get_user_asm(val, "lw", ptr); break; \
- case 8: __GET_USER_DW(val, ptr); break; \
- default: __get_user_unknown(); break; \
- } \
-} while (0)
-
-#define __get_user_nocheck(x, ptr, size) \
-({ \
- int __gu_err; \
- \
- __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); \
- \
- if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
- __get_user_common((x), size, __gu_ptr); \
- \
- __gu_err; \
-})
-
-#define __get_user_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" \
- " .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_asm_ll32(val, addr) \
-{ \
- union { \
- unsigned long long l; \
- __typeof__(*(addr)) t; \
- } __gu_tmp; \
- \
- __asm__ __volatile__( \
- "1: lw %1, (%3) \n" \
- "2: lw %D1, 4(%3) \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 " 2b, 4b \n" \
- " .previous \n" \
- : "=r" (__gu_err), "=&r" (__gu_tmp.l) \
- : "0" (0), "r" (addr), "i" (-EFAULT)); \
- \
- (val) = __gu_tmp.t; \
-}
-
-/*
- * Yuck. We need two variants, one for 64bit operation and one
- * for 32 bit mode and old iron.
- */
-#ifdef CONFIG_32BIT
-#define __PUT_USER_DW(ptr) __put_user_asm_ll32(ptr)
-#endif
-#ifdef CONFIG_64BIT
-#define __PUT_USER_DW(ptr) __put_user_asm("sd", ptr)
-#endif
-
-#define __put_user_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_asm("sh", ptr); break; \
- case 4: __put_user_asm("sw", ptr); break; \
- case 8: __PUT_USER_DW(ptr); break; \
- default: __put_user_unknown(); break; \
- } \
- __pu_err; \
-})
-
-#define __put_user_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_asm("sh", __pu_addr); break; \
- case 4: __put_user_asm("sw", __pu_addr); break; \
- case 8: __PUT_USER_DW(__pu_addr); break; \
- default: __put_user_unknown(); break; \
- } \
- } \
- __pu_err; \
-})
-
-#define __put_user_asm(insn, ptr) \
-{ \
- __asm__ __volatile__( \
- "1: " insn " %z2, %3 # __put_user_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_asm_ll32(ptr) \
-{ \
- __asm__ __volatile__( \
- "1: sw %2, (%3) # __put_user_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 " 2b, 4b \n" \
- " .previous" \
- : "=r" (__pu_err) \
- : "0" (0), "r" (__pu_val), "r" (ptr), \
- "i" (-EFAULT)); \
-}
-
-extern void __put_user_unknown(void);
-
-/*
- * 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
-
-#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
-#define DADDI_SCRATCH "$0"
-#else
-#define DADDI_SCRATCH "$3"
-#endif
-
-extern size_t __copy_user(void *__to, const void *__from, size_t __n);
-
-#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", "$15", "$24", "$31", \
- DADDI_SCRATCH, "memory"); \
- __cu_len_r; \
-})
-
-/*
- * __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.
- *
- * 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; \
- \
- might_sleep(); \
- __cu_to = (to); \
- __cu_from = (from); \
- __cu_len = (n); \
- __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); \
- __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); \
- __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.
- *
- * 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; \
- \
- might_sleep(); \
- __cu_to = (to); \
- __cu_from = (from); \
- __cu_len = (n); \
- if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) \
- __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
- __cu_len); \
- __cu_len; \
-})
-
-#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", "$15", "$24", "$31", \
- DADDI_SCRATCH, "memory"); \
- __cu_len_r; \
-})
-
-#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", "$15", "$24", "$31", \
- DADDI_SCRATCH, "memory"); \
- __cu_len_r; \
-})
-
-/*
- * __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.
- *
- * 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; \
- \
- might_sleep(); \
- __cu_to = (to); \
- __cu_from = (from); \
- __cu_len = (n); \
- __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.
- *
- * 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; \
- \
- might_sleep(); \
- __cu_to = (to); \
- __cu_from = (from); \
- __cu_len = (n); \
- if (access_ok(VERIFY_READ, __cu_from, __cu_len)) \
- __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
- __cu_len); \
- __cu_len; \
-})
-
-#define __copy_in_user(to, from, n) __copy_from_user(to, from, n)
-
-#define copy_in_user(to, from, n) \
-({ \
- void __user *__cu_to; \
- const void __user *__cu_from; \
- long __cu_len; \
- \
- might_sleep(); \
- __cu_to = (to); \
- __cu_from = (from); \
- __cu_len = (n); \
- if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) && \
- access_ok(VERIFY_WRITE, __cu_to, __cu_len))) \
- __cu_len = __invoke_copy_from_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;
-
- might_sleep();
- __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)
- : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
-
- return res;
-}
-
-#define clear_user(addr,n) \
-({ \
- void __user * __cl_addr = (addr); \
- unsigned long __cl_size = (n); \
- if (__cl_size && access_ok(VERIFY_WRITE, \
- ((unsigned long)(__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;
-
- might_sleep();
- __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;
-
- might_sleep();
- __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;
-}
-
-/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
-static inline long __strlen_user(const char __user *s)
-{
- long res;
-
- might_sleep();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- __MODULE_JAL(__strlen_user_nocheck_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s)
- : "$2", "$4", __UA_t0, "$31");
-
- 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.
- *
- * 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;
-
- might_sleep();
- __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;
-
- might_sleep();
- __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;
-}
-
-/*
- * strlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- *
- * Context: User context only. This function may sleep.
- *
- * 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 strnlen_user(const char __user *s, long n)
-{
- long res;
-
- might_sleep();
- __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;
-}
-
-struct exception_table_entry
-{
- unsigned long insn;
- unsigned long nextinsn;
-};
-
-extern int fixup_exception(struct pt_regs *regs);
-
-#endif /* _ASM_UACCESS_H */