1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __PARISC_UACCESS_H
3#define __PARISC_UACCESS_H
4
5/*
6 * User space memory access functions
7 */
8#include <asm/page.h>
9#include <asm/cache.h>
10#include <asm/extable.h>
11
12#include <linux/bug.h>
13#include <linux/string.h>
14
15#define TASK_SIZE_MAX DEFAULT_TASK_SIZE
16#include <asm/pgtable.h>
17#include <asm-generic/access_ok.h>
18
19#define put_user __put_user
20#define get_user __get_user
21
22#if !defined(CONFIG_64BIT)
23#define LDD_USER(sr, val, ptr)	__get_user_asm64(sr, val, ptr)
24#define STD_USER(sr, x, ptr)	__put_user_asm64(sr, x, ptr)
25#else
26#define LDD_USER(sr, val, ptr)	__get_user_asm(sr, val, "ldd", ptr)
27#define STD_USER(sr, x, ptr)	__put_user_asm(sr, "std", x, ptr)
28#endif
29
30#define __get_user_internal(sr, val, ptr)		\
31({							\
32	ASM_EXCEPTIONTABLE_VAR(__gu_err);		\
33							\
34	switch (sizeof(*(ptr))) {			\
35	case 1: __get_user_asm(sr, val, "ldb", ptr); break; \
36	case 2: __get_user_asm(sr, val, "ldh", ptr); break; \
37	case 4: __get_user_asm(sr, val, "ldw", ptr); break; \
38	case 8: LDD_USER(sr, val, ptr); break;		\
39	default: BUILD_BUG();				\
40	}						\
41							\
42	__gu_err;					\
43})
44
45#define __get_user(val, ptr)				\
46({							\
47	__get_user_internal(SR_USER, val, ptr);	\
48})
49
50#define __get_user_asm(sr, val, ldx, ptr)		\
51{							\
52	register long __gu_val;				\
53							\
54	__asm__("1: " ldx " 0(%%sr%2,%3),%0\n"		\
55		"9:\n"					\
56		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")	\
57		: "=r"(__gu_val), "+r"(__gu_err)        \
58		: "i"(sr), "r"(ptr));			\
59							\
60	(val) = (__force __typeof__(*(ptr))) __gu_val;	\
61}
62
63#define __get_kernel_nofault(dst, src, type, err_label)	\
64{							\
65	type __z;					\
66	long __err;					\
67	__err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \
68	if (unlikely(__err))				\
69		goto err_label;				\
70	else						\
71		*(type *)(dst) = __z;			\
72}
73
74
75#if !defined(CONFIG_64BIT)
76
77#define __get_user_asm64(sr, val, ptr)			\
78{							\
79	union {						\
80		unsigned long long	l;		\
81		__typeof__(*(ptr))	t;		\
82	} __gu_tmp;					\
83							\
84	__asm__("   copy %%r0,%R0\n"			\
85		"1: ldw 0(%%sr%2,%3),%0\n"		\
86		"2: ldw 4(%%sr%2,%3),%R0\n"		\
87		"9:\n"					\
88		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")	\
89		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%1")	\
90		: "=&r"(__gu_tmp.l), "+r"(__gu_err)	\
91		: "i"(sr), "r"(ptr));			\
92							\
93	(val) = __gu_tmp.t;				\
94}
95
96#endif /* !defined(CONFIG_64BIT) */
97
98
99#define __put_user_internal(sr, x, ptr)				\
100({								\
101	ASM_EXCEPTIONTABLE_VAR(__pu_err);		      	\
102								\
103	switch (sizeof(*(ptr))) {				\
104	case 1: __put_user_asm(sr, "stb", x, ptr); break;	\
105	case 2: __put_user_asm(sr, "sth", x, ptr); break;	\
106	case 4: __put_user_asm(sr, "stw", x, ptr); break;	\
107	case 8: STD_USER(sr, x, ptr); break;			\
108	default: BUILD_BUG();					\
109	}							\
110								\
111	__pu_err;						\
112})
113
114#define __put_user(x, ptr)					\
115({								\
116	__typeof__(&*(ptr)) __ptr = ptr;			\
117	__typeof__(*(__ptr)) __x = (__typeof__(*(__ptr)))(x);	\
118	__put_user_internal(SR_USER, __x, __ptr);		\
119})
120
121#define __put_kernel_nofault(dst, src, type, err_label)		\
122{								\
123	type __z = *(type *)(src);				\
124	long __err;						\
125	__err = __put_user_internal(SR_KERNEL, __z, (type *)(dst)); \
126	if (unlikely(__err))					\
127		goto err_label;					\
128}
129
130
131
132
133/*
134 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
135 * instead of writing. This is because they do not write to any memory
136 * gcc knows about, so there are no aliasing issues. These macros must
137 * also be aware that fixups are executed in the context of the fault,
138 * and any registers used there must be listed as clobbers.
139 * The register holding the possible EFAULT error (ASM_EXCEPTIONTABLE_REG)
140 * is already listed as input and output register.
141 */
142
143#define __put_user_asm(sr, stx, x, ptr)				\
144	__asm__ __volatile__ (					\
145		"1: " stx " %1,0(%%sr%2,%3)\n"			\
146		"9:\n"						\
147		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0")	\
148		: "+r"(__pu_err)				\
149		: "r"(x), "i"(sr), "r"(ptr))
150
151
152#if !defined(CONFIG_64BIT)
153
154#define __put_user_asm64(sr, __val, ptr) do {			\
155	__asm__ __volatile__ (					\
156		"1: stw %1,0(%%sr%2,%3)\n"			\
157		"2: stw %R1,4(%%sr%2,%3)\n"			\
158		"9:\n"						\
159		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0")	\
160		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%0")	\
161		: "+r"(__pu_err)				\
162		: "r"(__val), "i"(sr), "r"(ptr));		\
163} while (0)
164
165#endif /* !defined(CONFIG_64BIT) */
166
167/*
168 * Complex access routines -- external declarations
169 */
170
171extern long strncpy_from_user(char *, const char __user *, long);
172extern __must_check unsigned lclear_user(void __user *, unsigned long);
173extern __must_check long strnlen_user(const char __user *src, long n);
174/*
175 * Complex access routines -- macros
176 */
177
178#define clear_user lclear_user
179#define __clear_user lclear_user
180
181unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src,
182					    unsigned long len);
183unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src,
184					    unsigned long len);
185#define INLINE_COPY_TO_USER
186#define INLINE_COPY_FROM_USER
187
188#endif /* __PARISC_UACCESS_H */
189