uaccess.h

  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 __probe_user_internal(sr, error, ptr)			\
 46({								\
 47	__asm__("\tproberi (%%sr%1,%2),%3,%0\n"			\
 48		"\tcmpiclr,= 1,%0,%0\n"				\
 49		"\tldi %4,%0\n"					\
 50		: "=r"(error)					\
 51		: "i"(sr), "r"(ptr), "i"(PRIV_USER),		\
 52		  "i"(-EFAULT));				\
 53})
 54
 55#define __get_user(val, ptr)					\
 56({								\
 57	register long __gu_err;					\
 58								\
 59	__gu_err = __get_user_internal(SR_USER, val, ptr);	\
 60	if (likely(!__gu_err))					\
 61		__probe_user_internal(SR_USER, __gu_err, ptr);	\
 62	__gu_err;						\
 63})
 64
 65#define __get_user_asm(sr, val, ldx, ptr)		\
 66{							\
 67	register long __gu_val;				\
 68							\
 69	__asm__("1: " ldx " 0(%%sr%2,%3),%0\n"		\
 70		"9:\n"					\
 71		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")	\
 72		: "=r"(__gu_val), "+r"(__gu_err)        \
 73		: "i"(sr), "r"(ptr));			\
 74							\
 75	(val) = (__force __typeof__(*(ptr))) __gu_val;	\
 76}
 77
 78#define __get_kernel_nofault(dst, src, type, err_label)	\
 79{							\
 80	type __z;					\
 81	long __err;					\
 82	__err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \
 83	if (unlikely(__err))				\
 84		goto err_label;				\
 85	else						\
 86		*(type *)(dst) = __z;			\
 87}
 88
 89
 90#if !defined(CONFIG_64BIT)
 91
 92#define __get_user_asm64(sr, val, ptr)			\
 93{							\
 94	union {						\
 95		unsigned long long	l;		\
 96		__typeof__(*(ptr))	t;		\
 97	} __gu_tmp;					\
 98							\
 99	__asm__("   copy %%r0,%R0\n"			\
100		"1: ldw 0(%%sr%2,%3),%0\n"		\
101		"2: ldw 4(%%sr%2,%3),%R0\n"		\
102		"9:\n"					\
103		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")	\
104		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%1")	\
105		: "=&r"(__gu_tmp.l), "+r"(__gu_err)	\
106		: "i"(sr), "r"(ptr));			\
107							\
108	(val) = __gu_tmp.t;				\
109}
110
111#endif /* !defined(CONFIG_64BIT) */
112
113
114#define __put_user_internal(sr, x, ptr)				\
115({								\
116	ASM_EXCEPTIONTABLE_VAR(__pu_err);		      	\
117								\
118	switch (sizeof(*(ptr))) {				\
119	case 1: __put_user_asm(sr, "stb", x, ptr); break;	\
120	case 2: __put_user_asm(sr, "sth", x, ptr); break;	\
121	case 4: __put_user_asm(sr, "stw", x, ptr); break;	\
122	case 8: STD_USER(sr, x, ptr); break;			\
123	default: BUILD_BUG();					\
124	}							\
125								\
126	__pu_err;						\
127})
128
129#define __put_user(x, ptr)					\
130({								\
131	__typeof__(&*(ptr)) __ptr = ptr;			\
132	__typeof__(*(__ptr)) __x = (__typeof__(*(__ptr)))(x);	\
133	__put_user_internal(SR_USER, __x, __ptr);		\
134})
135
136#define __put_kernel_nofault(dst, src, type, err_label)		\
137{								\
138	type __z = *(type *)(src);				\
139	long __err;						\
140	__err = __put_user_internal(SR_KERNEL, __z, (type *)(dst)); \
141	if (unlikely(__err))					\
142		goto err_label;					\
143}
144
145
146
147
148/*
149 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
150 * instead of writing. This is because they do not write to any memory
151 * gcc knows about, so there are no aliasing issues. These macros must
152 * also be aware that fixups are executed in the context of the fault,
153 * and any registers used there must be listed as clobbers.
154 * The register holding the possible EFAULT error (ASM_EXCEPTIONTABLE_REG)
155 * is already listed as input and output register.
156 */
157
158#define __put_user_asm(sr, stx, x, ptr)				\
159	__asm__ __volatile__ (					\
160		"1: " stx " %1,0(%%sr%2,%3)\n"			\
161		"9:\n"						\
162		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0")	\
163		: "+r"(__pu_err)				\
164		: "r"(x), "i"(sr), "r"(ptr))
165
166
167#if !defined(CONFIG_64BIT)
168
169#define __put_user_asm64(sr, __val, ptr) do {			\
170	__asm__ __volatile__ (					\
171		"1: stw %1,0(%%sr%2,%3)\n"			\
172		"2: stw %R1,4(%%sr%2,%3)\n"			\
173		"9:\n"						\
174		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0")	\
175		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%0")	\
176		: "+r"(__pu_err)				\
177		: "r"(__val), "i"(sr), "r"(ptr));		\
178} while (0)
179
180#endif /* !defined(CONFIG_64BIT) */
181
182/*
183 * Complex access routines -- external declarations
184 */
185
186extern long strncpy_from_user(char *, const char __user *, long);
187extern __must_check unsigned lclear_user(void __user *, unsigned long);
188extern __must_check long strnlen_user(const char __user *src, long n);
189/*
190 * Complex access routines -- macros
191 */
192
193#define clear_user lclear_user
194#define __clear_user lclear_user
195
196unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src,
197					    unsigned long len);
198unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src,
199					    unsigned long len);
200#define INLINE_COPY_TO_USER
201#define INLINE_COPY_FROM_USER
202
203#endif /* __PARISC_UACCESS_H */