tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/include/asm-arm/proc-armo/uaccess.h
3 *
4 * Copyright (C) 1996 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11/*
12 * The fs functions are implemented on the ARM2 and ARM3 architectures
13 * manually.
14 * Use *_user functions to access user memory with faulting behaving
15 * as though the user is accessing the memory.
16 * Use set_fs(get_ds()) and then the *_user functions to allow them to
17 * access kernel memory.
18 */
19
20/*
21 * These are the values used to represent the user `fs' and the kernel `ds'
22 * FIXME - the KERNEL_DS should end at 0x03000000 but we want to access ROM at
23 * 0x03400000. ideally we want to forbid access to the IO space inbetween.
24 */
25#define KERNEL_DS 0x03FFFFFF
26#define USER_DS 0x02000000
27
28extern uaccess_t uaccess_user, uaccess_kernel;
29
30static inline void set_fs (mm_segment_t fs)
31{
32 current_thread_info()->addr_limit = fs;
33 current->thread.uaccess = (fs == USER_DS ? &uaccess_user : &uaccess_kernel);
34}
35
36#define __range_ok(addr,size) ({ \
37 unsigned long flag, sum; \
38 __asm__ __volatile__("subs %1, %0, %3; cmpcs %1, %2; movcs %0, #0" \
39 : "=&r" (flag), "=&r" (sum) \
40 : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
41 : "cc"); \
42 flag; })
43
44#define __addr_ok(addr) ({ \
45 unsigned long flag; \
46 __asm__ __volatile__("cmp %2, %0; movlo %0, #0" \
47 : "=&r" (flag) \
48 : "0" (current_thread_info()->addr_limit), "r" (addr) \
49 : "cc"); \
50 (flag == 0); })
51
52#define __put_user_asm_byte(x,addr,err) \
53 __asm__ __volatile__( \
54 " mov r0, %1\n" \
55 " mov r1, %2\n" \
56 " mov r2, %0\n" \
57 " mov lr, pc\n" \
58 " mov pc, %3\n" \
59 " mov %0, r2\n" \
60 : "=r" (err) \
61 : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_byte), \
62 "0" (err) \
63 : "r0", "r1", "r2", "lr")
64
65#define __put_user_asm_half(x,addr,err) \
66 __asm__ __volatile__( \
67 " mov r0, %1\n" \
68 " mov r1, %2\n" \
69 " mov r2, %0\n" \
70 " mov lr, pc\n" \
71 " mov pc, %3\n" \
72 " mov %0, r2\n" \
73 : "=r" (err) \
74 : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_half), \
75 "0" (err) \
76 : "r0", "r1", "r2", "lr")
77
78#define __put_user_asm_word(x,addr,err) \
79 __asm__ __volatile__( \
80 " mov r0, %1\n" \
81 " mov r1, %2\n" \
82 " mov r2, %0\n" \
83 " mov lr, pc\n" \
84 " mov pc, %3\n" \
85 " mov %0, r2\n" \
86 : "=r" (err) \
87 : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_word), \
88 "0" (err) \
89 : "r0", "r1", "r2", "lr")
90
91#define __put_user_asm_dword(x,addr,err) \
92 __asm__ __volatile__( \
93 " mov r0, %1\n" \
94 " mov r1, %2\n" \
95 " mov r2, %0\n" \
96 " mov lr, pc\n" \
97 " mov pc, %3\n" \
98 " mov %0, r2\n" \
99 : "=r" (err) \
100 : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_dword), \
101 "0" (err) \
102 : "r0", "r1", "r2", "lr")
103
104#define __get_user_asm_byte(x,addr,err) \
105 __asm__ __volatile__( \
106 " mov r0, %2\n" \
107 " mov r1, %0\n" \
108 " mov lr, pc\n" \
109 " mov pc, %3\n" \
110 " mov %0, r1\n" \
111 " mov %1, r0\n" \
112 : "=r" (err), "=r" (x) \
113 : "r" (addr), "r" (current->thread.uaccess->get_byte), "0" (err) \
114 : "r0", "r1", "r2", "lr")
115
116#define __get_user_asm_half(x,addr,err) \
117 __asm__ __volatile__( \
118 " mov r0, %2\n" \
119 " mov r1, %0\n" \
120 " mov lr, pc\n" \
121 " mov pc, %3\n" \
122 " mov %0, r1\n" \
123 " mov %1, r0\n" \
124 : "=r" (err), "=r" (x) \
125 : "r" (addr), "r" (current->thread.uaccess->get_half), "0" (err) \
126 : "r0", "r1", "r2", "lr")
127
128#define __get_user_asm_word(x,addr,err) \
129 __asm__ __volatile__( \
130 " mov r0, %2\n" \
131 " mov r1, %0\n" \
132 " mov lr, pc\n" \
133 " mov pc, %3\n" \
134 " mov %0, r1\n" \
135 " mov %1, r0\n" \
136 : "=r" (err), "=r" (x) \
137 : "r" (addr), "r" (current->thread.uaccess->get_word), "0" (err) \
138 : "r0", "r1", "r2", "lr")
139
140#define __do_copy_from_user(to,from,n) \
141 (n) = current->thread.uaccess->copy_from_user((to),(from),(n))
142
143#define __do_copy_to_user(to,from,n) \
144 (n) = current->thread.uaccess->copy_to_user((to),(from),(n))
145
146#define __do_clear_user(addr,sz) \
147 (sz) = current->thread.uaccess->clear_user((addr),(sz))
148
149#define __do_strncpy_from_user(dst,src,count,res) \
150 (res) = current->thread.uaccess->strncpy_from_user(dst,src,count)
151
152#define __do_strnlen_user(s,n,res) \
153 (res) = current->thread.uaccess->strnlen_user(s,n)