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diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
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+/*
+ * 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/string.h>
+#include <asm/asm-eva.h>
+#include <asm/extable.h>
+
+#ifdef CONFIG_32BIT
+
+#define __UA_LIMIT 0x80000000UL
+#define TASK_SIZE_MAX KSEG0
+
+#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 TASK_SIZE_MAX XKSSEG
+
+#define __UA_ADDR ".dword"
+#define __UA_LA "dla"
+#define __UA_ADDU "daddu"
+#define __UA_t0 "$12"
+#define __UA_t1 "$13"
+
+#endif /* CONFIG_64BIT */
+
+#include <asm-generic/access_ok.h>
+
+/*
+ * 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) \
+({ \
+ __typeof__(*(ptr)) __user *__p = (ptr); \
+ \
+ might_fault(); \
+ access_ok(__p, sizeof(*__p)) ? __put_user((x), __p) : -EFAULT; \
+})
+
+/*
+ * 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) \
+({ \
+ const __typeof__(*(ptr)) __user *__p = (ptr); \
+ \
+ might_fault(); \
+ access_ok(__p, sizeof(*__p)) ? __get_user((x), __p) : \
+ ((x) = 0, -EFAULT); \
+})
+
+/*
+ * __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) \
+({ \
+ __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \
+ __typeof__(*(ptr)) __pu_val = (x); \
+ int __pu_err = 0; \
+ \
+ __chk_user_ptr(__pu_ptr); \
+ switch (sizeof(*__pu_ptr)) { \
+ case 1: \
+ __put_data_asm(user_sb, __pu_ptr); \
+ break; \
+ case 2: \
+ __put_data_asm(user_sh, __pu_ptr); \
+ break; \
+ case 4: \
+ __put_data_asm(user_sw, __pu_ptr); \
+ break; \
+ case 8: \
+ __PUT_DW(user_sd, __pu_ptr); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ } \
+ \
+ __pu_err; \
+})
+
+/*
+ * __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) \
+({ \
+ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
+ int __gu_err = 0; \
+ \
+ __chk_user_ptr(__gu_ptr); \
+ switch (sizeof(*__gu_ptr)) { \
+ case 1: \
+ __get_data_asm((x), user_lb, __gu_ptr); \
+ break; \
+ case 2: \
+ __get_data_asm((x), user_lh, __gu_ptr); \
+ break; \
+ case 4: \
+ __get_data_asm((x), user_lw, __gu_ptr); \
+ break; \
+ case 8: \
+ __GET_DW((x), user_ld, __gu_ptr); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ } \
+ \
+ __gu_err; \
+})
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct __user *)(x))
+
+#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
+
+#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; \
+}
+
+#define __get_kernel_nofault(dst, src, type, err_label) \
+do { \
+ int __gu_err; \
+ \
+ switch (sizeof(type)) { \
+ case 1: \
+ __get_data_asm(*(type *)(dst), kernel_lb, \
+ (__force type *)(src)); \
+ break; \
+ case 2: \
+ __get_data_asm(*(type *)(dst), kernel_lh, \
+ (__force type *)(src)); \
+ break; \
+ case 4: \
+ __get_data_asm(*(type *)(dst), kernel_lw, \
+ (__force type *)(src)); \
+ break; \
+ case 8: \
+ __GET_DW(*(type *)(dst), kernel_ld, \
+ (__force type *)(src)); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ break; \
+ } \
+ if (unlikely(__gu_err)) \
+ goto err_label; \
+} while (0)
+
+/*
+ * 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_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)); \
+}
+
+#define __put_kernel_nofault(dst, src, type, err_label) \
+do { \
+ type __pu_val; \
+ int __pu_err = 0; \
+ \
+ __pu_val = *(__force type *)(src); \
+ switch (sizeof(type)) { \
+ case 1: \
+ __put_data_asm(kernel_sb, (type *)(dst)); \
+ break; \
+ case 2: \
+ __put_data_asm(kernel_sh, (type *)(dst)); \
+ break; \
+ case 4: \
+ __put_data_asm(kernel_sw, (type *)(dst)) \
+ break; \
+ case 8: \
+ __PUT_DW(kernel_sd, (type *)(dst)); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ break; \
+ } \
+ if (unlikely(__pu_err)) \
+ goto err_label; \
+} while (0)
+
+
+/*
+ * 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 __raw_copy_from_user(void *__to, const void *__from, size_t __n);
+extern size_t __raw_copy_to_user(void *__to, const void *__from, size_t __n);
+
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long 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(__raw_copy_from_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");
+
+ return __cu_len_r;
+}
+
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long 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(__raw_copy_to_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");
+
+ return __cu_len_r;
+}
+
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+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 */
+
+ 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_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 (!access_ok(__from, __len))
+ return -EFAULT;
+
+ 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_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;
+
+ if (!access_ok(s, 1))
+ return 0;
+
+ might_fault();
+ __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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 11:51:57 +0000