[deliverable/linux.git] / arch / sparc / include / asm / uaccess_64.h

#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H

/*
 * User space memory access functions
 */

#ifdef __KERNEL__
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/string.h>
#include <linux/thread_info.h>
#include <asm/asi.h>
#include <asm/spitfire.h>
#include <asm-generic/uaccess-unaligned.h>
#endif

#ifndef __ASSEMBLY__

#include <asm/processor.h>

/*
 * Sparc64 is segmented, though more like the M68K than the I386.
 * We use the secondary ASI to address user memory, which references a
 * completely different VM map, thus there is zero chance of the user
 * doing something queer and tricking us into poking kernel memory.
 *
 * What is left here is basically what is needed for the other parts of
 * the kernel that expect to be able to manipulate, erum, "segments".
 * Or perhaps more properly, permissions.
 *
 * "For historical reasons, these macros are grossly misnamed." -Linus
 */

#define KERNEL_DS   ((mm_segment_t) { ASI_P })
#define USER_DS     ((mm_segment_t) { ASI_AIUS })	/* har har har */

#define VERIFY_READ	0
#define VERIFY_WRITE	1

#define get_fs() ((mm_segment_t) { get_thread_current_ds() })
#define get_ds() (KERNEL_DS)

#define segment_eq(a,b)  ((a).seg == (b).seg)

#define set_fs(val)								\
do {										\
	set_thread_current_ds((val).seg);					\
	__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));	\
} while(0)

static inline int __access_ok(const void __user * addr, unsigned long size)
{
	return 1;
}

static inline int access_ok(int type, const void __user * addr, unsigned long size)
{
	return 1;
}

/*
 * The exception table consists of pairs of addresses: the first is the
 * address of an instruction that is allowed to fault, and the second is
 * the address at which the program should continue.  No registers are
 * modified, so it is entirely up to the continuation code to figure out
 * what to do.
 *
 * All the routines below use bits of fixup code that are out of line
 * with the main instruction path.  This means when everything is well,
 * we don't even have to jump over them.  Further, they do not intrude
 * on our cache or tlb entries.
 */

struct exception_table_entry {
        unsigned int insn, fixup;
};

extern void __ret_efault(void);
extern void __retl_efault(void);

/* Uh, these should become the main single-value transfer routines..
 * They automatically use the right size if we just have the right
 * pointer type..
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 */
#define put_user(x,ptr) ({ \
unsigned long __pu_addr = (unsigned long)(ptr); \
__chk_user_ptr(ptr); \
__put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })

#define get_user(x,ptr) ({ \
unsigned long __gu_addr = (unsigned long)(ptr); \
__chk_user_ptr(ptr); \
__get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })

#define __put_user(x,ptr) put_user(x,ptr)
#define __get_user(x,ptr) get_user(x,ptr)

struct __large_struct { unsigned long buf[100]; };
#define __m(x) ((struct __large_struct *)(x))

#define __put_user_nocheck(data,addr,size) ({ \
register int __pu_ret; \
switch (size) { \
case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
default: __pu_ret = __put_user_bad(); break; \
} __pu_ret; })

#define __put_user_asm(x,size,addr,ret)					\
__asm__ __volatile__(							\
	"/* Put user asm, inline. */\n"					\
"1:\t"	"st"#size "a %1, [%2] %%asi\n\t"				\
	"clr	%0\n"							\
"2:\n\n\t"								\
	".section .fixup,#alloc,#execinstr\n\t"				\
	".align	4\n"							\
"3:\n\t"								\
	"sethi	%%hi(2b), %0\n\t"					\
	"jmpl	%0 + %%lo(2b), %%g0\n\t"				\
	" mov	%3, %0\n\n\t"						\
	".previous\n\t"							\
	".section __ex_table,\"a\"\n\t"					\
	".align	4\n\t"							\
	".word	1b, 3b\n\t"						\
	".previous\n\n\t"						\
       : "=r" (ret) : "r" (x), "r" (__m(addr)),				\
	 "i" (-EFAULT))

extern int __put_user_bad(void);

#define __get_user_nocheck(data,addr,size,type) ({ \
register int __gu_ret; \
register unsigned long __gu_val; \
switch (size) { \
case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
} data = (type) __gu_val; __gu_ret; })

#define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
register unsigned long __gu_val __asm__ ("l1"); \
switch (size) { \
case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
default: if (__get_user_bad()) return retval; \
} data = (type) __gu_val; })

#define __get_user_asm(x,size,addr,ret)					\
__asm__ __volatile__(							\
	"/* Get user asm, inline. */\n"					\
"1:\t"	"ld"#size "a [%2] %%asi, %1\n\t"				\
	"clr	%0\n"							\
"2:\n\n\t"								\
	".section .fixup,#alloc,#execinstr\n\t"				\
	".align	4\n"							\
"3:\n\t"								\
	"sethi	%%hi(2b), %0\n\t"					\
	"clr	%1\n\t"							\
	"jmpl	%0 + %%lo(2b), %%g0\n\t"				\
	" mov	%3, %0\n\n\t"						\
	".previous\n\t"							\
	".section __ex_table,\"a\"\n\t"					\
	".align	4\n\t"							\
	".word	1b, 3b\n\n\t"						\
	".previous\n\t"							\
       : "=r" (ret), "=r" (x) : "r" (__m(addr)),			\
	 "i" (-EFAULT))

#define __get_user_asm_ret(x,size,addr,retval)				\
if (__builtin_constant_p(retval) && retval == -EFAULT)			\
__asm__ __volatile__(							\
	"/* Get user asm ret, inline. */\n"				\
"1:\t"	"ld"#size "a [%1] %%asi, %0\n\n\t"				\
	".section __ex_table,\"a\"\n\t"					\
	".align	4\n\t"							\
	".word	1b,__ret_efault\n\n\t"					\
	".previous\n\t"							\
       : "=r" (x) : "r" (__m(addr)));					\
else									\
__asm__ __volatile__(							\
	"/* Get user asm ret, inline. */\n"				\
"1:\t"	"ld"#size "a [%1] %%asi, %0\n\n\t"				\
	".section .fixup,#alloc,#execinstr\n\t"				\
	".align	4\n"							\
"3:\n\t"								\
	"ret\n\t"							\
	" restore %%g0, %2, %%o0\n\n\t"					\
	".previous\n\t"							\
	".section __ex_table,\"a\"\n\t"					\
	".align	4\n\t"							\
	".word	1b, 3b\n\n\t"						\
	".previous\n\t"							\
       : "=r" (x) : "r" (__m(addr)), "i" (retval))

extern int __get_user_bad(void);

extern unsigned long __must_check ___copy_from_user(void *to,
						    const void __user *from,
						    unsigned long size);
extern unsigned long copy_from_user_fixup(void *to, const void __user *from,
					  unsigned long size);
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long size)
{
	unsigned long ret = ___copy_from_user(to, from, size);

	if (unlikely(ret))
		ret = copy_from_user_fixup(to, from, size);

	return ret;
}
#define __copy_from_user copy_from_user

extern unsigned long __must_check ___copy_to_user(void __user *to,
						  const void *from,
						  unsigned long size);
extern unsigned long copy_to_user_fixup(void __user *to, const void *from,
					unsigned long size);
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long size)
{
	unsigned long ret = ___copy_to_user(to, from, size);

	if (unlikely(ret))
		ret = copy_to_user_fixup(to, from, size);
	return ret;
}
#define __copy_to_user copy_to_user

extern unsigned long __must_check ___copy_in_user(void __user *to,
						  const void __user *from,
						  unsigned long size);
extern unsigned long copy_in_user_fixup(void __user *to, void __user *from,
					unsigned long size);
static inline unsigned long __must_check
copy_in_user(void __user *to, void __user *from, unsigned long size)
{
	unsigned long ret = ___copy_in_user(to, from, size);

	if (unlikely(ret))
		ret = copy_in_user_fixup(to, from, size);
	return ret;
}
#define __copy_in_user copy_in_user

extern unsigned long __must_check __clear_user(void __user *, unsigned long);

#define clear_user __clear_user

extern __must_check long strlen_user(const char __user *str);
extern __must_check long strnlen_user(const char __user *str, long n);

#define __copy_to_user_inatomic ___copy_to_user
#define __copy_from_user_inatomic ___copy_from_user

struct pt_regs;
extern unsigned long compute_effective_address(struct pt_regs *,
					       unsigned int insn,
					       unsigned int rd);

#endif  /* __ASSEMBLY__ */

#endif /* _ASM_UACCESS_H */
Commit	Line	Data
f5e706ad SR	1	#ifndef _ASM_UACCESS_H
	2	#define _ASM_UACCESS_H
	3
	4	/*
	5	* User space memory access functions
	6	*/
	7
	8	#ifdef __KERNEL__
fb34035e	9	#include <linux/errno.h>
f5e706ad	10	#include <linux/compiler.h>
f5e706ad	11	#include <linux/string.h>
8abf9196	12	#include <linux/thread_info.h>
f5e706ad	13	#include <asm/asi.h>
f5e706ad	14	#include <asm/spitfire.h>
5b17e1cd	15	#include <asm-generic/uaccess-unaligned.h>
f5e706ad SR	16	#endif
	17
	18	#ifndef __ASSEMBLY__
	19
2c66f623 DM	20	#include <asm/processor.h>
2c66f623 DM	21
f5e706ad SR	22	/*
	23	* Sparc64 is segmented, though more like the M68K than the I386.
	24	* We use the secondary ASI to address user memory, which references a
	25	* completely different VM map, thus there is zero chance of the user
	26	* doing something queer and tricking us into poking kernel memory.
	27	*
	28	* What is left here is basically what is needed for the other parts of
	29	* the kernel that expect to be able to manipulate, erum, "segments".
	30	* Or perhaps more properly, permissions.
	31	*
	32	* "For historical reasons, these macros are grossly misnamed." -Linus
	33	*/
	34
	35	#define KERNEL_DS ((mm_segment_t) { ASI_P })
	36	#define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */
	37
	38	#define VERIFY_READ 0
	39	#define VERIFY_WRITE 1
	40
	41	#define get_fs() ((mm_segment_t) { get_thread_current_ds() })
	42	#define get_ds() (KERNEL_DS)
	43
	44	#define segment_eq(a,b) ((a).seg == (b).seg)
	45
	46	#define set_fs(val) \
	47	do { \
	48	set_thread_current_ds((val).seg); \
	49	__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \
	50	} while(0)
	51
	52	static inline int __access_ok(const void __user * addr, unsigned long size)
	53	{
	54	return 1;
	55	}
	56
	57	static inline int access_ok(int type, const void __user * addr, unsigned long size)
	58	{
	59	return 1;
	60	}
	61
	62	/*
	63	* The exception table consists of pairs of addresses: the first is the
	64	* address of an instruction that is allowed to fault, and the second is
	65	* the address at which the program should continue. No registers are
	66	* modified, so it is entirely up to the continuation code to figure out
	67	* what to do.
	68	*
	69	* All the routines below use bits of fixup code that are out of line
	70	* with the main instruction path. This means when everything is well,
	71	* we don't even have to jump over them. Further, they do not intrude
	72	* on our cache or tlb entries.
	73	*/
	74
	75	struct exception_table_entry {
	76	unsigned int insn, fixup;
	77	};
	78
	79	extern void __ret_efault(void);
	80	extern void __retl_efault(void);
	81
	82	/* Uh, these should become the main single-value transfer routines..
	83	* They automatically use the right size if we just have the right
	84	* pointer type..
	85	*
86	* This gets kind of ugly. We want to return _two_ values in "get_user()"
87	* and yet we don't want to do any pointers, because that is too much
88	* of a performance impact. Thus we have a few rather ugly macros here,
89	* and hide all the ugliness from the user.
90	*/
91	#define put_user(x,ptr) ({ \
92	unsigned long __pu_addr = (unsigned long)(ptr); \
93	__chk_user_ptr(ptr); \
94	__put_user_nocheck((__typeof__((ptr)))(x),__pu_addr,sizeof((ptr))); })
95
96	#define get_user(x,ptr) ({ \
97	unsigned long __gu_addr = (unsigned long)(ptr); \
98	__chk_user_ptr(ptr); \
99	__get_user_nocheck((x),__gu_addr,sizeof((ptr)),__typeof__((ptr))); })
100
101	#define __put_user(x,ptr) put_user(x,ptr)
102	#define __get_user(x,ptr) get_user(x,ptr)
103
104	struct __large_struct { unsigned long buf[100]; };
105	#define __m(x) ((struct __large_struct *)(x))
106
107	#define __put_user_nocheck(data,addr,size) ({ \
108	register int __pu_ret; \
109	switch (size) { \
110	case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
111	case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
112	case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
113	case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
114	default: __pu_ret = __put_user_bad(); break; \
115	} __pu_ret; })
116
117	#define __put_user_asm(x,size,addr,ret) \
118	__asm__ __volatile__( \
119	"/* Put user asm, inline. */\n" \
120	"1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
121	"clr %0\n" \
122	"2:\n\n\t" \
123	".section .fixup,#alloc,#execinstr\n\t" \
124	".align 4\n" \
125	"3:\n\t" \
126	"sethi %%hi(2b), %0\n\t" \
127	"jmpl %0 + %%lo(2b), %%g0\n\t" \
128	" mov %3, %0\n\n\t" \
129	".previous\n\t" \
130	".section __ex_table,\"a\"\n\t" \
131	".align 4\n\t" \
132	".word 1b, 3b\n\t" \
133	".previous\n\n\t" \
134	: "=r" (ret) : "r" (x), "r" (__m(addr)), \
135	"i" (-EFAULT))
136
137	extern int __put_user_bad(void);
138
139	#define __get_user_nocheck(data,addr,size,type) ({ \
140	register int __gu_ret; \
141	register unsigned long __gu_val; \
142	switch (size) { \
143	case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
144	case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
145	case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
146	case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
147	default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
148	} data = (type) __gu_val; __gu_ret; })
149
150	#define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
151	register unsigned long __gu_val __asm__ ("l1"); \
152	switch (size) { \
153	case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
154	case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
155	case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
156	case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
157	default: if (__get_user_bad()) return retval; \
158	} data = (type) __gu_val; })
159
160	#define __get_user_asm(x,size,addr,ret) \
161	__asm__ __volatile__( \
162	"/* Get user asm, inline. */\n" \
163	"1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
164	"clr %0\n" \
165	"2:\n\n\t" \
166	".section .fixup,#alloc,#execinstr\n\t" \
167	".align 4\n" \
168	"3:\n\t" \
169	"sethi %%hi(2b), %0\n\t" \
170	"clr %1\n\t" \
171	"jmpl %0 + %%lo(2b), %%g0\n\t" \
172	" mov %3, %0\n\n\t" \
173	".previous\n\t" \
174	".section __ex_table,\"a\"\n\t" \
175	".align 4\n\t" \
176	".word 1b, 3b\n\n\t" \
177	".previous\n\t" \
178	: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
179	"i" (-EFAULT))
180
181	#define __get_user_asm_ret(x,size,addr,retval) \
182	if (__builtin_constant_p(retval) && retval == -EFAULT) \
183	__asm__ __volatile__( \
184	"/* Get user asm ret, inline. */\n" \
185	"1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \
186	".section __ex_table,\"a\"\n\t" \
187	".align 4\n\t" \
188	".word 1b,__ret_efault\n\n\t" \
189	".previous\n\t" \
190	: "=r" (x) : "r" (__m(addr))); \
191	else \
192	__asm__ __volatile__( \
193	"/* Get user asm ret, inline. */\n" \
194	"1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \
195	".section .fixup,#alloc,#execinstr\n\t" \
196	".align 4\n" \
197	"3:\n\t" \
198	"ret\n\t" \
199	" restore %%g0, %2, %%o0\n\n\t" \
200	".previous\n\t" \
201	".section __ex_table,\"a\"\n\t" \
202	".align 4\n\t" \
203	".word 1b, 3b\n\n\t" \
204	".previous\n\t" \
205	: "=r" (x) : "r" (__m(addr)), "i" (retval))
206
207	extern int __get_user_bad(void);
208
209	extern unsigned long __must_check ___copy_from_user(void *to,
210	const void __user *from,
211	unsigned long size);
212	extern unsigned long copy_from_user_fixup(void to, const void __user from,
213	unsigned long size);
214	static inline unsigned long __must_check
215	copy_from_user(void to, const void __user from, unsigned long size)
216	{
4cb6066a DM	217	unsigned long ret = ___copy_from_user(to, from, size);
	218
	219	if (unlikely(ret))
	220	ret = copy_from_user_fixup(to, from, size);
	221
f5e706ad SR	222	return ret;
	223	}
	224	#define __copy_from_user copy_from_user
	225
	226	extern unsigned long __must_check ___copy_to_user(void __user *to,
	227	const void *from,
	228	unsigned long size);
	229	extern unsigned long copy_to_user_fixup(void __user to, const void from,
	230	unsigned long size);
	231	static inline unsigned long __must_check
	232	copy_to_user(void __user to, const void from, unsigned long size)
	233	{
	234	unsigned long ret = ___copy_to_user(to, from, size);
	235
	236	if (unlikely(ret))
	237	ret = copy_to_user_fixup(to, from, size);
	238	return ret;
	239	}
	240	#define __copy_to_user copy_to_user
	241
	242	extern unsigned long __must_check ___copy_in_user(void __user *to,
	243	const void __user *from,
	244	unsigned long size);
	245	extern unsigned long copy_in_user_fixup(void __user to, void __user from,
	246	unsigned long size);
	247	static inline unsigned long __must_check
	248	copy_in_user(void __user to, void __user from, unsigned long size)
	249	{
	250	unsigned long ret = ___copy_in_user(to, from, size);
	251
	252	if (unlikely(ret))
	253	ret = copy_in_user_fixup(to, from, size);
	254	return ret;
	255	}
	256	#define __copy_in_user copy_in_user
	257
	258	extern unsigned long __must_check __clear_user(void __user *, unsigned long);
	259
	260	#define clear_user __clear_user
	261
2c66f623 DM	262	extern __must_check long strlen_user(const char __user *str);
2c66f623 DM	263	extern __must_check long strnlen_user(const char __user *str, long n);
f5e706ad	264
145e1c00 HD	265	#define __copy_to_user_inatomic ___copy_to_user
145e1c00 HD	266	#define __copy_from_user_inatomic ___copy_from_user
f5e706ad	267
f88620b9 DM	268	struct pt_regs;
	269	extern unsigned long compute_effective_address(struct pt_regs *,
	270	unsigned int insn,
	271	unsigned int rd);
	272
f5e706ad SR	273	#endif /* __ASSEMBLY__ */
	274
	275	#endif /* _ASM_UACCESS_H */