[mirror_ubuntu-hirsute-kernel.git] / arch / parisc / include / asm / uaccess.h

#ifndef __PARISC_UACCESS_H
#define __PARISC_UACCESS_H

/*
 * User space memory access functions
 */
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/errno.h>
#include <asm-generic/uaccess-unaligned.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. Even on a 64bit kernel we could
 * use a 32bit (unsigned int) address here.
 */

struct exception_table_entry {
	unsigned long insn;	/* address of insn that is allowed to fault. */
	unsigned 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 {		    \
	__asm__ __volatile__ (				    \
		"\n1:\tstw %2,0(%1)"			    \
		"\n2:\tstw %R2,4(%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"(__val), "0"(__pu_err) \
		: "r1");				    \
} while (0)

#define __put_user_asm64(__val,ptr) do {	    	    \
	__asm__ __volatile__ (				    \
		"\n1:\tstw %2,0(%%sr3,%1)"		    \
		"\n2:\tstw %R2,4(%%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"(__val), "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 strncpy_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 user_addr_max() (~0UL)

#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);
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

extern void copy_from_user_overflow(void)
#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
        __compiletime_error("copy_from_user() buffer size is not provably correct")
#else
        __compiletime_warning("copy_from_user() buffer size is not provably correct")
#endif
;

static inline unsigned long __must_check copy_from_user(void *to,
                                          const void __user *from,
                                          unsigned long n)
{
        int sz = __compiletime_object_size(to);
        int ret = -EFAULT;

        if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
                ret = __copy_from_user(to, from, n);
        else
                copy_from_user_overflow();

        return ret;
}

struct pt_regs;
int fixup_exception(struct pt_regs *regs);

#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	7	#include <asm/page.h>
1da177e4	8	#include <asm/cache.h>
888c31fc	9	#include <asm/errno.h>
5b17e1cd	10	#include <asm-generic/uaccess-unaligned.h>
1da177e4 LT	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
a0ffa8f0 HD	36	static inline long access_ok(int type, const void __user * addr,
a0ffa8f0 HD	37	unsigned long size)
1da177e4	38	{
a0ffa8f0	39	return 1;
1da177e4 LT	40	}
1da177e4 LT	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
61dbbaeb HD	62	* the address to the fixup routine. Even on a 64bit kernel we could
61dbbaeb HD	63	* use a 32bit (unsigned int) address here.
1da177e4 LT	64	*/
	65
	66	struct exception_table_entry {
61dbbaeb HD	67	unsigned long insn; /* address of insn that is allowed to fault. */
61dbbaeb HD	68	unsigned long fixup; /* fixup routine */
1da177e4 LT	69	};
1da177e4 LT	70
0b3d643f HD	71	#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
	72	".section __ex_table,\"aw\"\n" \
	73	ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
	74	".previous\n"
	75
1da177e4 LT	76	/*
	77	* The page fault handler stores, in a per-cpu area, the following information
	78	* if a fixup routine is available.
	79	*/
	80	struct exception_data {
	81	unsigned long fault_ip;
	82	unsigned long fault_space;
	83	unsigned long fault_addr;
	84	};
	85
	86	#define __get_user(x,ptr) \
	87	({ \
	88	register long __gu_err __asm__ ("r8") = 0; \
	89	register long __gu_val __asm__ ("r9") = 0; \
	90	\
	91	if (segment_eq(get_fs(),KERNEL_DS)) { \
	92	switch (sizeof(*(ptr))) { \
	93	case 1: __get_kernel_asm("ldb",ptr); break; \
	94	case 2: __get_kernel_asm("ldh",ptr); break; \
	95	case 4: __get_kernel_asm("ldw",ptr); break; \
	96	case 8: LDD_KERNEL(ptr); break; \
	97	default: __get_kernel_bad(); break; \
	98	} \
	99	} \
	100	else { \
	101	switch (sizeof(*(ptr))) { \
	102	case 1: __get_user_asm("ldb",ptr); break; \
	103	case 2: __get_user_asm("ldh",ptr); break; \
	104	case 4: __get_user_asm("ldw",ptr); break; \
	105	case 8: LDD_USER(ptr); break; \
	106	default: __get_user_bad(); break; \
	107	} \
	108	} \
	109	\
	110	(x) = (__typeof__(*(ptr))) __gu_val; \
	111	__gu_err; \
	112	})
	113
1da177e4	114	#define __get_kernel_asm(ldx,ptr) \
0b3d643f HD	115	__asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \
0b3d643f HD	116	ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
1da177e4 LT	117	: "=r"(__gu_val), "=r"(__gu_err) \
	118	: "r"(ptr), "1"(__gu_err) \
	119	: "r1");
	120
	121	#define __get_user_asm(ldx,ptr) \
0b3d643f HD	122	__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \
0b3d643f HD	123	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
1da177e4 LT	124	: "=r"(__gu_val), "=r"(__gu_err) \
	125	: "r"(ptr), "1"(__gu_err) \
	126	: "r1");
1da177e4 LT	127
	128	#define __put_user(x,ptr) \
	129	({ \
	130	register long __pu_err __asm__ ("r8") = 0; \
	131	__typeof__((ptr)) __x = (__typeof__((ptr)))(x); \
	132	\
	133	if (segment_eq(get_fs(),KERNEL_DS)) { \
	134	switch (sizeof(*(ptr))) { \
	135	case 1: __put_kernel_asm("stb",__x,ptr); break; \
	136	case 2: __put_kernel_asm("sth",__x,ptr); break; \
	137	case 4: __put_kernel_asm("stw",__x,ptr); break; \
	138	case 8: STD_KERNEL(__x,ptr); break; \
	139	default: __put_kernel_bad(); break; \
	140	} \
	141	} \
	142	else { \
	143	switch (sizeof(*(ptr))) { \
	144	case 1: __put_user_asm("stb",__x,ptr); break; \
	145	case 2: __put_user_asm("sth",__x,ptr); break; \
	146	case 4: __put_user_asm("stw",__x,ptr); break; \
	147	case 8: STD_USER(__x,ptr); break; \
	148	default: __put_user_bad(); break; \
	149	} \
	150	} \
	151	\
	152	__pu_err; \
	153	})
	154
	155	/*
	156	* The "__put_user/kernel_asm()" macros tell gcc they read from memory
	157	* instead of writing. This is because they do not write to any memory
3fd3a74f CD	158	* gcc knows about, so there are no aliasing issues. These macros must
	159	* also be aware that "fixup_put_user_skip_[12]" are executed in the
	160	* context of the fault, and any registers used there must be listed
	161	* as clobbers. In this case only "r1" is used by the current routines.
	162	* r8/r9 are already listed as err/val.
1da177e4 LT	163	*/
1da177e4 LT	164
1da177e4 LT	165	#define __put_kernel_asm(stx,x,ptr) \
1da177e4 LT	166	__asm__ __volatile__ ( \
0b3d643f HD	167	"\n1:\t" stx "\t%2,0(%1)\n\t" \
0b3d643f HD	168	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
1da177e4	169	: "=r"(__pu_err) \
3fd3a74f CD	170	: "r"(ptr), "r"(x), "0"(__pu_err) \
3fd3a74f CD	171	: "r1")
1da177e4 LT	172
	173	#define __put_user_asm(stx,x,ptr) \
	174	__asm__ __volatile__ ( \
0b3d643f HD	175	"\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \
0b3d643f HD	176	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
1da177e4 LT	177	: "=r"(__pu_err) \
	178	: "r"(ptr), "r"(x), "0"(__pu_err) \
	179	: "r1")
	180
1da177e4	181
ca72a223	182	#if !defined(CONFIG_64BIT)
94a1981d HD	183
94a1981d HD	184	#define __put_kernel_asm64(__val,ptr) do { \
1da177e4	185	__asm__ __volatile__ ( \
0b3d643f	186	"\n1:\tstw %2,0(%1)" \
0f28b628	187	"\n2:\tstw %R2,4(%1)\n\t" \
0b3d643f HD	188	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
0b3d643f HD	189	ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
1da177e4	190	: "=r"(__pu_err) \
0f28b628	191	: "r"(ptr), "r"(__val), "0"(__pu_err) \
1da177e4 LT	192	: "r1"); \
	193	} while (0)
	194
94a1981d	195	#define __put_user_asm64(__val,ptr) do { \
1da177e4	196	__asm__ __volatile__ ( \
0b3d643f	197	"\n1:\tstw %2,0(%%sr3,%1)" \
0f28b628	198	"\n2:\tstw %R2,4(%%sr3,%1)\n\t" \
0b3d643f HD	199	ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
0b3d643f HD	200	ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
1da177e4	201	: "=r"(__pu_err) \
0f28b628	202	: "r"(ptr), "r"(__val), "0"(__pu_err) \
1da177e4 LT	203	: "r1"); \
	204	} while (0)
	205
ca72a223	206	#endif /* !defined(CONFIG_64BIT) */
1da177e4 LT	207
	208
	209	/*
	210	* Complex access routines -- external declarations
	211	*/
	212
	213	extern unsigned long lcopy_to_user(void __user , const void , unsigned long);
	214	extern unsigned long lcopy_from_user(void , const void __user , unsigned long);
	215	extern unsigned long lcopy_in_user(void __user , const void __user , unsigned long);
b1195c0e	216	extern long strncpy_from_user(char , const char __user , long);
1da177e4 LT	217	extern unsigned lclear_user(void __user *,unsigned long);
1da177e4 LT	218	extern long lstrnlen_user(const char __user *,long);
1da177e4 LT	219	/*
	220	* Complex access routines -- macros
	221	*/
a0ffa8f0	222	#define user_addr_max() (~0UL)
1da177e4	223
1da177e4 LT	224	#define strnlen_user lstrnlen_user
	225	#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
	226	#define clear_user lclear_user
	227	#define __clear_user lclear_user
	228
	229	unsigned long copy_to_user(void __user dst, const void src, unsigned long len);
	230	#define __copy_to_user copy_to_user
888c31fc	231	unsigned long __copy_from_user(void dst, const void __user src, unsigned long len);
1da177e4 LT	232	unsigned long copy_in_user(void __user dst, const void __user src, unsigned long len);
	233	#define __copy_in_user copy_in_user
	234	#define __copy_to_user_inatomic __copy_to_user
	235	#define __copy_from_user_inatomic __copy_from_user
	236
888c31fc HD	237	extern void copy_from_user_overflow(void)
	238	#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
	239	__compiletime_error("copy_from_user() buffer size is not provably correct")
	240	#else
	241	__compiletime_warning("copy_from_user() buffer size is not provably correct")
	242	#endif
	243	;
	244
	245	static inline unsigned long __must_check copy_from_user(void *to,
	246	const void __user *from,
	247	unsigned long n)
	248	{
	249	int sz = __compiletime_object_size(to);
	250	int ret = -EFAULT;
	251
	252	if (likely(sz == -1 \|\| !__builtin_constant_p(n) \|\| sz >= n))
	253	ret = __copy_from_user(to, from, n);
	254	else
	255	copy_from_user_overflow();
	256
	257	return ret;
	258	}
	259
e448372c	260	struct pt_regs;
c61c25eb KM	261	int fixup_exception(struct pt_regs *regs);
c61c25eb KM	262
1da177e4	263	#endif /* __PARISC_UACCESS_H */