From 9999e48639b3cecb08ffb37358bcba3b48161b29 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 08:50:17 +0000
Subject: [PATCH] add ax88772_rst
---
kernel/arch/riscv/include/asm/uaccess.h | 213 +++++++++++++++++++++++++----------------------------
1 files changed, 100 insertions(+), 113 deletions(-)
diff --git a/kernel/arch/riscv/include/asm/uaccess.h b/kernel/arch/riscv/include/asm/uaccess.h
index f0ea315..66af6ab 100644
--- a/kernel/arch/riscv/include/asm/uaccess.h
+++ b/kernel/arch/riscv/include/asm/uaccess.h
@@ -1,14 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Regents of the University of California
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*
* This file was copied from include/asm-generic/uaccess.h
*/
@@ -16,13 +8,17 @@
#ifndef _ASM_RISCV_UACCESS_H
#define _ASM_RISCV_UACCESS_H
+#include <asm/pgtable.h> /* for TASK_SIZE */
+
/*
* User space memory access functions
*/
+#ifdef CONFIG_MMU
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
#include <asm/byteorder.h>
+#include <asm/extable.h>
#include <asm/asm.h>
#define __enable_user_access() \
@@ -30,38 +26,8 @@
#define __disable_user_access() \
__asm__ __volatile__ ("csrc sstatus, %0" : : "r" (SR_SUM) : "memory")
-/*
- * 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.
- */
-
-#define KERNEL_DS (~0UL)
-#define USER_DS (TASK_SIZE)
-
-#define get_ds() (KERNEL_DS)
-#define get_fs() (current_thread_info()->addr_limit)
-
-static inline void set_fs(mm_segment_t fs)
-{
- current_thread_info()->addr_limit = fs;
-}
-
-#define segment_eq(a, b) ((a) == (b))
-
-#define user_addr_max() (get_fs())
-
-
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
-
/**
* 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
*
@@ -76,7 +42,7 @@
* checks that the pointer is in the user space range - after calling
* this function, memory access functions may still return -EFAULT.
*/
-#define access_ok(type, addr, size) ({ \
+#define access_ok(addr, size) ({ \
__chk_user_ptr(addr); \
likely(__access_ok((unsigned long __force)(addr), (size))); \
})
@@ -87,9 +53,7 @@
*/
static inline int __access_ok(unsigned long addr, unsigned long size)
{
- const mm_segment_t fs = get_fs();
-
- return (size <= fs) && (addr <= (fs - size));
+ return size <= TASK_SIZE && addr <= TASK_SIZE - size;
}
/*
@@ -105,21 +69,8 @@
* on our cache or tlb entries.
*/
-struct exception_table_entry {
- unsigned long insn, fixup;
-};
-
-extern int fixup_exception(struct pt_regs *state);
-
-#if defined(__LITTLE_ENDIAN)
-#define __MSW 1
#define __LSW 0
-#elif defined(__BIG_ENDIAN)
-#define __MSW 0
-#define __LSW 1
-#else
-#error "Unknown endianness"
-#endif
+#define __MSW 1
/*
* The "__xxx" versions of the user access functions do not verify the address
@@ -131,7 +82,6 @@
do { \
uintptr_t __tmp; \
__typeof__(x) __x; \
- __enable_user_access(); \
__asm__ __volatile__ ( \
"1:\n" \
" " insn " %1, %3\n" \
@@ -149,7 +99,6 @@
" .previous" \
: "+r" (err), "=&r" (__x), "=r" (__tmp) \
: "m" (*(ptr)), "i" (-EFAULT)); \
- __disable_user_access(); \
(x) = __x; \
} while (0)
@@ -162,7 +111,6 @@
u32 __user *__ptr = (u32 __user *)(ptr); \
u32 __lo, __hi; \
uintptr_t __tmp; \
- __enable_user_access(); \
__asm__ __volatile__ ( \
"1:\n" \
" lw %1, %4\n" \
@@ -186,12 +134,30 @@
"=r" (__tmp) \
: "m" (__ptr[__LSW]), "m" (__ptr[__MSW]), \
"i" (-EFAULT)); \
- __disable_user_access(); \
(x) = (__typeof__(x))((__typeof__((x)-(x)))( \
(((u64)__hi << 32) | __lo))); \
} while (0)
#endif /* CONFIG_64BIT */
+#define __get_user_nocheck(x, __gu_ptr, __gu_err) \
+do { \
+ switch (sizeof(*__gu_ptr)) { \
+ case 1: \
+ __get_user_asm("lb", (x), __gu_ptr, __gu_err); \
+ break; \
+ case 2: \
+ __get_user_asm("lh", (x), __gu_ptr, __gu_err); \
+ break; \
+ case 4: \
+ __get_user_asm("lw", (x), __gu_ptr, __gu_err); \
+ break; \
+ case 8: \
+ __get_user_8((x), __gu_ptr, __gu_err); \
+ break; \
+ default: \
+ BUILD_BUG(); \
+ } \
+} while (0)
/**
* __get_user: - Get a simple variable from user space, with less checking.
@@ -215,25 +181,15 @@
*/
#define __get_user(x, ptr) \
({ \
- register long __gu_err = 0; \
const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
+ long __gu_err = 0; \
+ \
__chk_user_ptr(__gu_ptr); \
- switch (sizeof(*__gu_ptr)) { \
- case 1: \
- __get_user_asm("lb", (x), __gu_ptr, __gu_err); \
- break; \
- case 2: \
- __get_user_asm("lh", (x), __gu_ptr, __gu_err); \
- break; \
- case 4: \
- __get_user_asm("lw", (x), __gu_ptr, __gu_err); \
- break; \
- case 8: \
- __get_user_8((x), __gu_ptr, __gu_err); \
- break; \
- default: \
- BUILD_BUG(); \
- } \
+ \
+ __enable_user_access(); \
+ __get_user_nocheck(x, __gu_ptr, __gu_err); \
+ __disable_user_access(); \
+ \
__gu_err; \
})
@@ -258,16 +214,15 @@
({ \
const __typeof__(*(ptr)) __user *__p = (ptr); \
might_fault(); \
- access_ok(VERIFY_READ, __p, sizeof(*__p)) ? \
+ access_ok(__p, sizeof(*__p)) ? \
__get_user((x), __p) : \
- ((x) = 0, -EFAULT); \
+ ((x) = (__force __typeof__(x))0, -EFAULT); \
})
#define __put_user_asm(insn, x, ptr, err) \
do { \
uintptr_t __tmp; \
__typeof__(*(ptr)) __x = x; \
- __enable_user_access(); \
__asm__ __volatile__ ( \
"1:\n" \
" " insn " %z3, %2\n" \
@@ -284,7 +239,6 @@
" .previous" \
: "+r" (err), "=r" (__tmp), "=m" (*(ptr)) \
: "rJ" (__x), "i" (-EFAULT)); \
- __disable_user_access(); \
} while (0)
#ifdef CONFIG_64BIT
@@ -296,7 +250,6 @@
u32 __user *__ptr = (u32 __user *)(ptr); \
u64 __x = (__typeof__((x)-(x)))(x); \
uintptr_t __tmp; \
- __enable_user_access(); \
__asm__ __volatile__ ( \
"1:\n" \
" sw %z4, %2\n" \
@@ -318,35 +271,11 @@
"=m" (__ptr[__LSW]), \
"=m" (__ptr[__MSW]) \
: "rJ" (__x), "rJ" (__x >> 32), "i" (-EFAULT)); \
- __disable_user_access(); \
} while (0)
#endif /* CONFIG_64BIT */
-
-/**
- * __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) \
-({ \
- register long __pu_err = 0; \
- __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
- __chk_user_ptr(__gu_ptr); \
+#define __put_user_nocheck(x, __gu_ptr, __pu_err) \
+do { \
switch (sizeof(*__gu_ptr)) { \
case 1: \
__put_user_asm("sb", (x), __gu_ptr, __pu_err); \
@@ -363,6 +292,41 @@
default: \
BUILD_BUG(); \
} \
+} while (0)
+
+/**
+ * __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. The value of @x is copied to avoid
+ * re-ordering where @x is evaluated inside the block that enables user-space
+ * access (thus bypassing user space protection if @x is a function).
+ *
+ * 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 *__gu_ptr = (ptr); \
+ __typeof__(*__gu_ptr) __val = (x); \
+ long __pu_err = 0; \
+ \
+ __chk_user_ptr(__gu_ptr); \
+ \
+ __enable_user_access(); \
+ __put_user_nocheck(__val, __gu_ptr, __pu_err); \
+ __disable_user_access(); \
+ \
__pu_err; \
})
@@ -386,15 +350,15 @@
({ \
__typeof__(*(ptr)) __user *__p = (ptr); \
might_fault(); \
- access_ok(VERIFY_WRITE, __p, sizeof(*__p)) ? \
+ access_ok(__p, sizeof(*__p)) ? \
__put_user((x), __p) : \
-EFAULT; \
})
-extern unsigned long __must_check __asm_copy_to_user(void __user *to,
+unsigned long __must_check __asm_copy_to_user(void __user *to,
const void *from, unsigned long n);
-extern unsigned long __must_check __asm_copy_from_user(void *to,
+unsigned long __must_check __asm_copy_from_user(void *to,
const void __user *from, unsigned long n);
static inline unsigned long
@@ -421,7 +385,7 @@
unsigned long __must_check clear_user(void __user *to, unsigned long n)
{
might_fault();
- return access_ok(VERIFY_WRITE, to, n) ?
+ return access_ok(to, n) ?
__clear_user(to, n) : n;
}
@@ -500,4 +464,27 @@
__ret; \
})
+#define HAVE_GET_KERNEL_NOFAULT
+
+#define __get_kernel_nofault(dst, src, type, err_label) \
+do { \
+ long __kr_err; \
+ \
+ __get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \
+ if (unlikely(__kr_err)) \
+ goto err_label; \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label) \
+do { \
+ long __kr_err; \
+ \
+ __put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \
+ if (unlikely(__kr_err)) \
+ goto err_label; \
+} while (0)
+
+#else /* CONFIG_MMU */
+#include <asm-generic/uaccess.h>
+#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_UACCESS_H */
--
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