[deliverable/linux.git] / include / asm-parisc / uaccess.h

#ifndef __PARISC_UACCESS_H
#define __PARISC_UACCESS_H

/*
 * User space memory access functions
 */
#include <asm/page.h>
#include <asm/system.h>
#include <asm/cache.h>
#include <asm-generic/uaccess.h>

#define VERIFY_READ 0
#define VERIFY_WRITE 1

#define KERNEL_DS	((mm_segment_t){0})
#define USER_DS 	((mm_segment_t){1})

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

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current_thread_info()->addr_limit)
#define set_fs(x)	(current_thread_info()->addr_limit = (x))

/*
 * Note that since kernel addresses are in a separate address space on
 * parisc, we don't need to do anything for access_ok().
 * We just let the page fault handler do the right thing. This also means
 * that put_user is the same as __put_user, etc.
 */

extern int __get_kernel_bad(void);
extern int __get_user_bad(void);
extern int __put_kernel_bad(void);
extern int __put_user_bad(void);

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

#define put_user __put_user
#define get_user __get_user

#if !defined(CONFIG_64BIT)
#define LDD_KERNEL(ptr)		__get_kernel_bad();
#define LDD_USER(ptr)		__get_user_bad();
#define STD_KERNEL(x, ptr)	__put_kernel_asm64(x,ptr)
#define STD_USER(x, ptr)	__put_user_asm64(x,ptr)
#define ASM_WORD_INSN		".word\t"
#else
#define LDD_KERNEL(ptr)		__get_kernel_asm("ldd",ptr)
#define LDD_USER(ptr)		__get_user_asm("ldd",ptr)
#define STD_KERNEL(x, ptr)	__put_kernel_asm("std",x,ptr)
#define STD_USER(x, ptr)	__put_user_asm("std",x,ptr)
#define ASM_WORD_INSN		".dword\t"
#endif

/*
 * The exception table contains two values: the first is an address
 * for an instruction that is allowed to fault, and the second is
 * the address to the fixup routine. 
 */

struct exception_table_entry {
	unsigned long insn;  /* address of insn that is allowed to fault.   */
	long fixup;          /* fixup routine */
};

#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
	".section __ex_table,\"aw\"\n"			   \
	ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
	".previous\n"

/*
 * The page fault handler stores, in a per-cpu area, the following information
 * if a fixup routine is available.
 */
struct exception_data {
	unsigned long fault_ip;
	unsigned long fault_space;
	unsigned long fault_addr;
};

#define __get_user(x,ptr)                               \
({                                                      \
	register long __gu_err __asm__ ("r8") = 0;      \
	register long __gu_val __asm__ ("r9") = 0;      \
							\
	if (segment_eq(get_fs(),KERNEL_DS)) {           \
	    switch (sizeof(*(ptr))) {                   \
	    case 1: __get_kernel_asm("ldb",ptr); break; \
	    case 2: __get_kernel_asm("ldh",ptr); break; \
	    case 4: __get_kernel_asm("ldw",ptr); break; \
	    case 8: LDD_KERNEL(ptr); break;		\
	    default: __get_kernel_bad(); break;         \
	    }                                           \
	}                                               \
	else {                                          \
	    switch (sizeof(*(ptr))) {                   \
	    case 1: __get_user_asm("ldb",ptr); break;   \
	    case 2: __get_user_asm("ldh",ptr); break;   \
	    case 4: __get_user_asm("ldw",ptr); break;   \
	    case 8: LDD_USER(ptr);  break;		\
	    default: __get_user_bad(); break;           \
	    }                                           \
	}                                               \
							\
	(x) = (__typeof__(*(ptr))) __gu_val;            \
	__gu_err;                                       \
})

#define __get_kernel_asm(ldx,ptr)                       \
	__asm__("\n1:\t" ldx "\t0(%2),%0\n\t"		\
		ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
		: "=r"(__gu_val), "=r"(__gu_err)        \
		: "r"(ptr), "1"(__gu_err)		\
		: "r1");

#define __get_user_asm(ldx,ptr)                         \
	__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t"	\
		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
		: "=r"(__gu_val), "=r"(__gu_err)        \
		: "r"(ptr), "1"(__gu_err)		\
		: "r1");

#define __put_user(x,ptr)                                       \
({								\
	register long __pu_err __asm__ ("r8") = 0;      	\
        __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x);	\
								\
	if (segment_eq(get_fs(),KERNEL_DS)) {                   \
	    switch (sizeof(*(ptr))) {                           \
	    case 1: __put_kernel_asm("stb",__x,ptr); break;     \
	    case 2: __put_kernel_asm("sth",__x,ptr); break;     \
	    case 4: __put_kernel_asm("stw",__x,ptr); break;     \
	    case 8: STD_KERNEL(__x,ptr); break;			\
	    default: __put_kernel_bad(); break;			\
	    }                                                   \
	}                                                       \
	else {                                                  \
	    switch (sizeof(*(ptr))) {                           \
	    case 1: __put_user_asm("stb",__x,ptr); break;       \
	    case 2: __put_user_asm("sth",__x,ptr); break;       \
	    case 4: __put_user_asm("stw",__x,ptr); break;       \
	    case 8: STD_USER(__x,ptr); break;			\
	    default: __put_user_bad(); break;			\
	    }                                                   \
	}                                                       \
								\
	__pu_err;						\
})

/*
 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
 * instead of writing. This is because they do not write to any memory
 * gcc knows about, so there are no aliasing issues. These macros must
 * also be aware that "fixup_put_user_skip_[12]" are executed in the
 * context of the fault, and any registers used there must be listed
 * as clobbers. In this case only "r1" is used by the current routines.
 * r8/r9 are already listed as err/val.
 */

#define __put_kernel_asm(stx,x,ptr)                         \
	__asm__ __volatile__ (                              \
		"\n1:\t" stx "\t%2,0(%1)\n\t"		    \
		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
		: "=r"(__pu_err)                            \
		: "r"(ptr), "r"(x), "0"(__pu_err)	    \
	    	: "r1")

#define __put_user_asm(stx,x,ptr)                           \
	__asm__ __volatile__ (                              \
		"\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t"	    \
		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
		: "=r"(__pu_err)                            \
		: "r"(ptr), "r"(x), "0"(__pu_err)	    \
		: "r1")


#if !defined(CONFIG_64BIT)

#define __put_kernel_asm64(__val,ptr) do {		    \
	u64 __val64 = (u64)(__val);			    \
	u32 hi = (__val64) >> 32;			    \
	u32 lo = (__val64) & 0xffffffff;		    \
	__asm__ __volatile__ (				    \
		"\n1:\tstw %2,0(%1)"			    \
		"\n2:\tstw %3,4(%1)\n\t"		    \
		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
		ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
		: "=r"(__pu_err)                            \
		: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
		: "r1");				    \
} while (0)

#define __put_user_asm64(__val,ptr) do {	    	    \
	u64 __val64 = (u64)(__val);			    \
	u32 hi = (__val64) >> 32;			    \
	u32 lo = (__val64) & 0xffffffff;		    \
	__asm__ __volatile__ (				    \
		"\n1:\tstw %2,0(%%sr3,%1)"		    \
		"\n2:\tstw %3,4(%%sr3,%1)\n\t"		    \
		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
		ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
		: "=r"(__pu_err)                            \
		: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
		: "r1");				    \
} while (0)

#endif /* !defined(CONFIG_64BIT) */


/*
 * Complex access routines -- external declarations
 */

extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
extern long lstrncpy_from_user(char *, const char __user *, long);
extern unsigned lclear_user(void __user *,unsigned long);
extern long lstrnlen_user(const char __user *,long);

/*
 * Complex access routines -- macros
 */

#define strncpy_from_user lstrncpy_from_user
#define strnlen_user lstrnlen_user
#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
#define clear_user lclear_user
#define __clear_user lclear_user

unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
#define __copy_to_user copy_to_user
unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
#define __copy_from_user copy_from_user
unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
#define __copy_in_user copy_in_user
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user

#endif /* __PARISC_UACCESS_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __PARISC_UACCESS_H
	2	#define __PARISC_UACCESS_H
	3
	4	/*
	5	* User space memory access functions
	6	*/
1da177e4 LT	7	#include <asm/page.h>
	8	#include <asm/system.h>
	9	#include <asm/cache.h>
	10	#include <asm-generic/uaccess.h>
	11
	12	#define VERIFY_READ 0
	13	#define VERIFY_WRITE 1
	14
	15	#define KERNEL_DS ((mm_segment_t){0})
	16	#define USER_DS ((mm_segment_t){1})
	17
	18	#define segment_eq(a,b) ((a).seg == (b).seg)
	19
	20	#define get_ds() (KERNEL_DS)
	21	#define get_fs() (current_thread_info()->addr_limit)
	22	#define set_fs(x) (current_thread_info()->addr_limit = (x))
	23
	24	/*
	25	* Note that since kernel addresses are in a separate address space on
e49332bd	26	* parisc, we don't need to do anything for access_ok().
1da177e4 LT	27	* We just let the page fault handler do the right thing. This also means
	28	* that put_user is the same as __put_user, etc.
	29	*/
	30
	31	extern int __get_kernel_bad(void);
	32	extern int __get_user_bad(void);
	33	extern int __put_kernel_bad(void);
	34	extern int __put_user_bad(void);
	35
	36	static inline long access_ok(int type, const void __user * addr,
	37	unsigned long size)
	38	{
	39	return 1;
	40	}
	41
1da177e4 LT	42	#define put_user __put_user
	43	#define get_user __get_user
	44
ca72a223	45	#if !defined(CONFIG_64BIT)
1da177e4 LT	46	#define LDD_KERNEL(ptr) __get_kernel_bad();
	47	#define LDD_USER(ptr) __get_user_bad();
	48	#define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr)
	49	#define STD_USER(x, ptr) __put_user_asm64(x,ptr)
94a1981d	50	#define ASM_WORD_INSN ".word\t"
1da177e4	51	#else
94a1981d HD	52	#define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
	53	#define LDD_USER(ptr) __get_user_asm("ldd",ptr)
	54	#define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
	55	#define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
	56	#define ASM_WORD_INSN ".dword\t"
1da177e4 LT	57	#endif
	58
	59	/*
	60	* The exception table contains two values: the first is an address
	61	* for an instruction that is allowed to fault, and the second is
	62	* the address to the fixup routine.
	63	*/
	64
	65	struct exception_table_entry {
	66	unsigned long insn; /* address of insn that is allowed to fault. */
	67	long fixup; /* fixup routine */
	68	};
	69
0b3d643f HD	70	#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
	71	".section __ex_table,\"aw\"\n" \
	72	ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
	73	".previous\n"
	74
1da177e4 LT	75	/*
	76	* The page fault handler stores, in a per-cpu area, the following information
	77	* if a fixup routine is available.
	78	*/
	79	struct exception_data {
	80	unsigned long fault_ip;
	81	unsigned long fault_space;
	82	unsigned long fault_addr;
	83	};
	84
	85	#define __get_user(x,ptr) \
	86	({ \
	87	register long __gu_err __asm__ ("r8") = 0; \
	88	register long __gu_val __asm__ ("r9") = 0; \
	89	\
	90	if (segment_eq(get_fs(),KERNEL_DS)) { \
	91	switch (sizeof(*(ptr))) { \
	92	case 1: __get_kernel_asm("ldb",ptr); break; \
	93	case 2: __get_kernel_asm("ldh",ptr); break; \
	94	case 4: __get_kernel_asm("ldw",ptr); break; \
	95	case 8: LDD_KERNEL(ptr); break; \
	96	default: __get_kernel_bad(); break; \
	97	} \
	98	} \
	99	else { \
	100	switch (sizeof(*(ptr))) { \
	101	case 1: __get_user_asm("ldb",ptr); break; \
	102	case 2: __get_user_asm("ldh",ptr); break; \
	103	case 4: __get_user_asm("ldw",ptr); break; \
	104	case 8: LDD_USER(ptr); break; \
	105	default: __get_user_bad(); break; \
	106	} \
	107	} \
	108	\
	109	(x) = (__typeof__(*(ptr))) __gu_val; \
	110	__gu_err; \
	111	})
	112
1da177e4	113	#define __get_kernel_asm(ldx,ptr) \
0b3d643f HD	114	__asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \
0b3d643f HD	115	ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
1da177e4 LT	116	: "=r"(__gu_val), "=r"(__gu_err) \
	117	: "r"(ptr), "1"(__gu_err) \
	118	: "r1");
	119
	120	#define __get_user_asm(ldx,ptr) \
0b3d643f HD	121	__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \
0b3d643f HD	122	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
1da177e4 LT	123	: "=r"(__gu_val), "=r"(__gu_err) \
	124	: "r"(ptr), "1"(__gu_err) \
	125	: "r1");
1da177e4 LT	126
	127	#define __put_user(x,ptr) \
	128	({ \
	129	register long __pu_err __asm__ ("r8") = 0; \
	130	__typeof__((ptr)) __x = (__typeof__((ptr)))(x); \
	131	\
	132	if (segment_eq(get_fs(),KERNEL_DS)) { \
	133	switch (sizeof(*(ptr))) { \
	134	case 1: __put_kernel_asm("stb",__x,ptr); break; \
	135	case 2: __put_kernel_asm("sth",__x,ptr); break; \
	136	case 4: __put_kernel_asm("stw",__x,ptr); break; \
	137	case 8: STD_KERNEL(__x,ptr); break; \
	138	default: __put_kernel_bad(); break; \
	139	} \
	140	} \
	141	else { \
	142	switch (sizeof(*(ptr))) { \
	143	case 1: __put_user_asm("stb",__x,ptr); break; \
	144	case 2: __put_user_asm("sth",__x,ptr); break; \
	145	case 4: __put_user_asm("stw",__x,ptr); break; \
	146	case 8: STD_USER(__x,ptr); break; \
	147	default: __put_user_bad(); break; \
	148	} \
	149	} \
	150	\
	151	__pu_err; \
	152	})
	153
	154	/*
	155	* The "__put_user/kernel_asm()" macros tell gcc they read from memory
	156	* instead of writing. This is because they do not write to any memory
3fd3a74f CD	157	* gcc knows about, so there are no aliasing issues. These macros must
	158	* also be aware that "fixup_put_user_skip_[12]" are executed in the
	159	* context of the fault, and any registers used there must be listed
	160	* as clobbers. In this case only "r1" is used by the current routines.
	161	* r8/r9 are already listed as err/val.
1da177e4 LT	162	*/
1da177e4 LT	163
1da177e4 LT	164	#define __put_kernel_asm(stx,x,ptr) \
1da177e4 LT	165	__asm__ __volatile__ ( \
0b3d643f HD	166	"\n1:\t" stx "\t%2,0(%1)\n\t" \
0b3d643f HD	167	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
1da177e4	168	: "=r"(__pu_err) \
3fd3a74f CD	169	: "r"(ptr), "r"(x), "0"(__pu_err) \
3fd3a74f CD	170	: "r1")
1da177e4 LT	171
	172	#define __put_user_asm(stx,x,ptr) \
	173	__asm__ __volatile__ ( \
0b3d643f HD	174	"\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \
0b3d643f HD	175	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
1da177e4 LT	176	: "=r"(__pu_err) \
	177	: "r"(ptr), "r"(x), "0"(__pu_err) \
	178	: "r1")
	179
1da177e4	180
ca72a223	181	#if !defined(CONFIG_64BIT)
94a1981d HD	182
	183	#define __put_kernel_asm64(__val,ptr) do { \
	184	u64 __val64 = (u64)(__val); \
	185	u32 hi = (__val64) >> 32; \
	186	u32 lo = (__val64) & 0xffffffff; \
1da177e4	187	__asm__ __volatile__ ( \
0b3d643f HD	188	"\n1:\tstw %2,0(%1)" \
	189	"\n2:\tstw %3,4(%1)\n\t" \
	190	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
	191	ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
1da177e4 LT	192	: "=r"(__pu_err) \
	193	: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
	194	: "r1"); \
	195	} while (0)
	196
94a1981d HD	197	#define __put_user_asm64(__val,ptr) do { \
	198	u64 __val64 = (u64)(__val); \
	199	u32 hi = (__val64) >> 32; \
	200	u32 lo = (__val64) & 0xffffffff; \
1da177e4	201	__asm__ __volatile__ ( \
0b3d643f HD	202	"\n1:\tstw %2,0(%%sr3,%1)" \
	203	"\n2:\tstw %3,4(%%sr3,%1)\n\t" \
	204	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
	205	ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
1da177e4 LT	206	: "=r"(__pu_err) \
	207	: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
	208	: "r1"); \
	209	} while (0)
	210
ca72a223	211	#endif /* !defined(CONFIG_64BIT) */
1da177e4 LT	212
	213
	214	/*
	215	* Complex access routines -- external declarations
	216	*/
	217
	218	extern unsigned long lcopy_to_user(void __user , const void , unsigned long);
	219	extern unsigned long lcopy_from_user(void , const void __user , unsigned long);
	220	extern unsigned long lcopy_in_user(void __user , const void __user , unsigned long);
	221	extern long lstrncpy_from_user(char , const char __user , long);
	222	extern unsigned lclear_user(void __user *,unsigned long);
	223	extern long lstrnlen_user(const char __user *,long);
	224
	225	/*
	226	* Complex access routines -- macros
	227	*/
	228
	229	#define strncpy_from_user lstrncpy_from_user
	230	#define strnlen_user lstrnlen_user
	231	#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
	232	#define clear_user lclear_user
	233	#define __clear_user lclear_user
	234
	235	unsigned long copy_to_user(void __user dst, const void src, unsigned long len);
	236	#define __copy_to_user copy_to_user
	237	unsigned long copy_from_user(void dst, const void __user src, unsigned long len);
	238	#define __copy_from_user copy_from_user
	239	unsigned long copy_in_user(void __user dst, const void __user src, unsigned long len);
	240	#define __copy_in_user copy_in_user
	241	#define __copy_to_user_inatomic __copy_to_user
	242	#define __copy_from_user_inatomic __copy_from_user
	243
	244	#endif /* __PARISC_UACCESS_H */