WebSVN - shark - Blame - Rev 1618 - /shark/branches/xen/drivers/net/include/asm/uaccess.h

Rev	Author	Line No.	Line
629	giacomo	1	#ifndef __i386_UACCESS_H
		2	#define __i386_UACCESS_H
		3
		4	// non compilo nulla!!!!
		5
		6	#if 0
		7
		8	/*
		9	* User space memory access functions
		10	*/
		11	#include <linux/config.h>
		12	#include <linux/sched.h>
		13	#include <asm/page.h>
		14
		15	#define VERIFY_READ 0
		16	#define VERIFY_WRITE 1
		17
		18	/*
		19	* The fs value determines whether argument validity checking should be
		20	* performed or not. If get_fs() == USER_DS, checking is performed, with
		21	* get_fs() == KERNEL_DS, checking is bypassed.
		22	*
		23	* For historical reasons, these macros are grossly misnamed.
		24	*/
		25
		26	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
		27
		28
		29	#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
		30	#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
		31
		32	#define get_ds() (KERNEL_DS)
		33	#define get_fs() (current->addr_limit)
		34	#define set_fs(x) (current->addr_limit = (x))
		35
		36	#define segment_eq(a,b) ((a).seg == (b).seg)
		37
		38	extern int __verify_write(const void *, unsigned long);
		39
		40	#define __addr_ok(addr) ((unsigned long)(addr) < (current->addr_limit.seg))
		41
		42	/*
		43	* Uhhuh, this needs 33-bit arithmetic. We have a carry..
		44	*/
		45	#define __range_ok(addr,size) ({ \
		46	unsigned long flag,sum; \
		47	asm("addl %3,%1 ; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0" \
		48	:"=&r" (flag), "=r" (sum) \
		49	:"1" (addr),"g" (size),"g" (current->addr_limit.seg)); \
		50	flag; })
		51
		52	#ifdef CONFIG_X86_WP_WORKS_OK
		53
		54	#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
		55
		56	#else
		57
		58	#define access_ok(type,addr,size) ( (__range_ok(addr,size) == 0) && \
		59	((type) == VERIFY_READ \|\| boot_cpu_data.wp_works_ok \|\| \
		60	segment_eq(get_fs(),KERNEL_DS) \|\| \
		61	__verify_write((void *)(addr),(size))))
		62
		63	#endif /* CPU */
		64
		65	extern inline int verify_area(int type, const void * addr, unsigned long size)
		66	{
		67	return access_ok(type,addr,size) ? 0 : -EFAULT;
		68	}
		69
		70
		71	/*
		72	* The exception table consists of pairs of addresses: the first is the
		73	* address of an instruction that is allowed to fault, and the second is
		74	* the address at which the program should continue. No registers are
		75	* modified, so it is entirely up to the continuation code to figure out
		76	* what to do.
		77	*
		78	* All the routines below use bits of fixup code that are out of line
		79	* with the main instruction path. This means when everything is well,
		80	* we don't even have to jump over them. Further, they do not intrude
		81	* on our cache or tlb entries.
		82	*/
		83
		84	struct exception_table_entry
		85	{
		86	unsigned long insn, fixup;
		87	};
		88
		89	/* Returns 0 if exception not found and fixup otherwise. */
		90	extern unsigned long search_exception_table(unsigned long);
		91
		92
		93	/*
		94	* These are the main single-value transfer routines. They automatically
		95	* use the right size if we just have the right pointer type.
		96	*
		97	* This gets kind of ugly. We want to return _two_ values in "get_user()"
		98	* and yet we don't want to do any pointers, because that is too much
		99	* of a performance impact. Thus we have a few rather ugly macros here,
		100	* and hide all the uglyness from the user.
		101	*
		102	* The "__xxx" versions of the user access functions are versions that
		103	* do not verify the address space, that must have been done previously
		104	* with a separate "access_ok()" call (this is used when we do multiple
		105	* accesses to the same area of user memory).
		106	*/
		107
		108	extern void __get_user_1(void);
		109	extern void __get_user_2(void);
		110	extern void __get_user_4(void);
		111
		112	#define __get_user_x(size,ret,x,ptr) \
		113	__asm__ __volatile__("call __get_user_" #size \
		114	:"=a" (ret),"=d" (x) \
		115	:"0" (ptr))
		116
		117	/* Careful: we have to cast the result to the type of the pointer for sign reasons */
		118	#define get_user(x,ptr) \
		119	({ int __ret_gu,__val_gu; \
		120	switch(sizeof (*(ptr))) { \
		121	case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \
		122	case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \
		123	case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \
		124	default: __get_user_x(X,__ret_gu,__val_gu,ptr); break; \
		125	} \
		126	(x) = (__typeof__(*(ptr)))__val_gu; \
		127	__ret_gu; \
		128	})
		129
		130	extern void __put_user_1(void);
		131	extern void __put_user_2(void);
		132	extern void __put_user_4(void);
		133
		134	extern void __put_user_bad(void);
		135
		136	#define __put_user_x(size,ret,x,ptr) \
		137	__asm__ __volatile__("call __put_user_" #size \
		138	:"=a" (ret) \
		139	:"0" (ptr),"d" (x) \
		140	:"cx")
		141
		142	#define put_user(x,ptr) \
		143	({ int __ret_pu; \
		144	switch(sizeof (*(ptr))) { \
		145	case 1: __put_user_x(1,__ret_pu,(__typeof__(*(ptr)))(x),ptr); break; \
		146	case 2: __put_user_x(2,__ret_pu,(__typeof__(*(ptr)))(x),ptr); break; \
		147	case 4: __put_user_x(4,__ret_pu,(__typeof__(*(ptr)))(x),ptr); break; \
		148	default: __put_user_x(X,__ret_pu,x,ptr); break; \
		149	} \
		150	__ret_pu; \
		151	})
		152
		153	#define __get_user(x,ptr) \
		154	__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
		155	#define __put_user(x,ptr) \
		156	__put_user_nocheck((__typeof__((ptr)))(x),(ptr),sizeof((ptr)))
		157
		158	#define __put_user_nocheck(x,ptr,size) \
		159	({ \
		160	long __pu_err; \
		161	__put_user_size((x),(ptr),(size),__pu_err); \
		162	__pu_err; \
		163	})
		164
		165	#define __put_user_size(x,ptr,size,retval) \
		166	do { \
		167	retval = 0; \
		168	switch (size) { \
		169	case 1: __put_user_asm(x,ptr,retval,"b","b","iq"); break; \
		170	case 2: __put_user_asm(x,ptr,retval,"w","w","ir"); break; \
		171	case 4: __put_user_asm(x,ptr,retval,"l","","ir"); break; \
		172	default: __put_user_bad(); \
		173	} \
		174	} while (0)
		175
		176	struct __large_struct { unsigned long buf[100]; };
		177	#define __m(x) ((struct __large_struct )(x))
		178
		179	/*
		180	* Tell gcc we read from memory instead of writing: this is because
		181	* we do not write to any memory gcc knows about, so there are no
		182	* aliasing issues.
		183	*/
		184	#define __put_user_asm(x, addr, err, itype, rtype, ltype) \
		185	__asm__ __volatile__( \
		186	"1: mov"itype" %"rtype"1,%2\n" \
		187	"2:\n" \
		188	".section .fixup,\"ax\"\n" \
		189	"3: movl %3,%0\n" \
		190	" jmp 2b\n" \
		191	".previous\n" \
		192	".section __ex_table,\"a\"\n" \
		193	" .align 4\n" \
		194	" .long 1b,3b\n" \
		195	".previous" \
		196	: "=r"(err) \
		197	: ltype (x), "m"(__m(addr)), "i"(-EFAULT), "0"(err))
		198
		199
		200	#define __get_user_nocheck(x,ptr,size) \
		201	({ \
		202	long __gu_err, __gu_val; \
		203	__get_user_size(__gu_val,(ptr),(size),__gu_err); \
		204	(x) = (__typeof__(*(ptr)))__gu_val; \
		205	__gu_err; \
		206	})
		207
		208	extern long __get_user_bad(void);
		209
		210	#define __get_user_size(x,ptr,size,retval) \
		211	do { \
		212	retval = 0; \
		213	switch (size) { \
		214	case 1: __get_user_asm(x,ptr,retval,"b","b","=q"); break; \
		215	case 2: __get_user_asm(x,ptr,retval,"w","w","=r"); break; \
		216	case 4: __get_user_asm(x,ptr,retval,"l","","=r"); break; \
		217	default: (x) = __get_user_bad(); \
		218	} \
		219	} while (0)
		220
		221	#define __get_user_asm(x, addr, err, itype, rtype, ltype) \
		222	__asm__ __volatile__( \
		223	"1: mov"itype" %2,%"rtype"1\n" \
		224	"2:\n" \
		225	".section .fixup,\"ax\"\n" \
		226	"3: movl %3,%0\n" \
		227	" xor"itype" %"rtype"1,%"rtype"1\n" \
		228	" jmp 2b\n" \
		229	".previous\n" \
		230	".section __ex_table,\"a\"\n" \
		231	" .align 4\n" \
		232	" .long 1b,3b\n" \
		233	".previous" \
		234	: "=r"(err), ltype (x) \
		235	: "m"(__m(addr)), "i"(-EFAULT), "0"(err))
		236
		237	/*
		238	* The "xxx_ret" versions return constant specified in third argument, if
		239	* something bad happens. These macros can be optimized for the
		240	* case of just returning from the function xxx_ret is used.
		241	*/
		242
		243	#define put_user_ret(x,ptr,ret) ({ if (put_user(x,ptr)) return ret; })
		244
		245	#define get_user_ret(x,ptr,ret) ({ if (get_user(x,ptr)) return ret; })
		246
		247	#define __put_user_ret(x,ptr,ret) ({ if (__put_user(x,ptr)) return ret; })
		248
		249	#define __get_user_ret(x,ptr,ret) ({ if (__get_user(x,ptr)) return ret; })
		250
		251
		252	/*
		253	* Copy To/From Userspace
		254	*/
		255
		256	/* Generic arbitrary sized copy. */
		257	#define __copy_user(to,from,size) \
		258	do { \
		259	int __d0, __d1; \
		260	__asm__ __volatile__( \
		261	"0: rep; movsl\n" \
		262	" movl %3,%0\n" \
		263	"1: rep; movsb\n" \
		264	"2:\n" \
		265	".section .fixup,\"ax\"\n" \
		266	"3: lea 0(%3,%0,4),%0\n" \
		267	" jmp 2b\n" \
		268	".previous\n" \
		269	".section __ex_table,\"a\"\n" \
		270	" .align 4\n" \
		271	" .long 0b,3b\n" \
		272	" .long 1b,2b\n" \
		273	".previous" \
		274	: "=&c"(size), "=&D" (__d0), "=&S" (__d1) \
		275	: "r"(size & 3), "0"(size / 4), "1"(to), "2"(from) \
		276	: "memory"); \
		277	} while (0)
		278
		279	#define __copy_user_zeroing(to,from,size) \
		280	do { \
		281	int __d0, __d1; \
		282	__asm__ __volatile__( \
		283	"0: rep; movsl\n" \
		284	" movl %3,%0\n" \
		285	"1: rep; movsb\n" \
		286	"2:\n" \
		287	".section .fixup,\"ax\"\n" \
		288	"3: lea 0(%3,%0,4),%0\n" \
		289	"4: pushl %0\n" \
		290	" pushl %%eax\n" \
		291	" xorl %%eax,%%eax\n" \
		292	" rep; stosb\n" \
		293	" popl %%eax\n" \
		294	" popl %0\n" \
		295	" jmp 2b\n" \
		296	".previous\n" \
		297	".section __ex_table,\"a\"\n" \
		298	" .align 4\n" \
		299	" .long 0b,3b\n" \
		300	" .long 1b,4b\n" \
		301	".previous" \
		302	: "=&c"(size), "=&D" (__d0), "=&S" (__d1) \
		303	: "r"(size & 3), "0"(size / 4), "1"(to), "2"(from) \
		304	: "memory"); \
		305	} while (0)
		306
		307	/* We let the __ versions of copy_from/to_user inline, because they're often
		308	* used in fast paths and have only a small space overhead.
		309	*/
		310	static inline unsigned long
		311	__generic_copy_from_user_nocheck(void to, const void from, unsigned long n)
		312	{
		313	__copy_user_zeroing(to,from,n);
		314	return n;
		315	}
		316
		317	static inline unsigned long
		318	__generic_copy_to_user_nocheck(void to, const void from, unsigned long n)
		319	{
		320	__copy_user(to,from,n);
		321	return n;
		322	}
		323
		324
		325	/* Optimize just a little bit when we know the size of the move. */
		326	#define __constant_copy_user(to, from, size) \
		327	do { \
		328	int __d0, __d1; \
		329	switch (size & 3) { \
		330	default: \
		331	__asm__ __volatile__( \
		332	"0: rep; movsl\n" \
		333	"1:\n" \
		334	".section .fixup,\"ax\"\n" \
		335	"2: shl $2,%0\n" \
		336	" jmp 1b\n" \
		337	".previous\n" \
		338	".section __ex_table,\"a\"\n" \
		339	" .align 4\n" \
		340	" .long 0b,2b\n" \
		341	".previous" \
		342	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		343	: "1"(from), "2"(to), "0"(size/4) \
		344	: "memory"); \
		345	break; \
		346	case 1: \
		347	__asm__ __volatile__( \
		348	"0: rep; movsl\n" \
		349	"1: movsb\n" \
		350	"2:\n" \
		351	".section .fixup,\"ax\"\n" \
		352	"3: shl $2,%0\n" \
		353	"4: incl %0\n" \
		354	" jmp 2b\n" \
		355	".previous\n" \
		356	".section __ex_table,\"a\"\n" \
		357	" .align 4\n" \
		358	" .long 0b,3b\n" \
		359	" .long 1b,4b\n" \
		360	".previous" \
		361	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		362	: "1"(from), "2"(to), "0"(size/4) \
		363	: "memory"); \
		364	break; \
		365	case 2: \
		366	__asm__ __volatile__( \
		367	"0: rep; movsl\n" \
		368	"1: movsw\n" \
		369	"2:\n" \
		370	".section .fixup,\"ax\"\n" \
		371	"3: shl $2,%0\n" \
		372	"4: addl $2,%0\n" \
		373	" jmp 2b\n" \
		374	".previous\n" \
		375	".section __ex_table,\"a\"\n" \
		376	" .align 4\n" \
		377	" .long 0b,3b\n" \
		378	" .long 1b,4b\n" \
		379	".previous" \
		380	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		381	: "1"(from), "2"(to), "0"(size/4) \
		382	: "memory"); \
		383	break; \
		384	case 3: \
		385	__asm__ __volatile__( \
		386	"0: rep; movsl\n" \
		387	"1: movsw\n" \
		388	"2: movsb\n" \
		389	"3:\n" \
		390	".section .fixup,\"ax\"\n" \
		391	"4: shl $2,%0\n" \
		392	"5: addl $2,%0\n" \
		393	"6: incl %0\n" \
		394	" jmp 3b\n" \
		395	".previous\n" \
		396	".section __ex_table,\"a\"\n" \
		397	" .align 4\n" \
		398	" .long 0b,4b\n" \
		399	" .long 1b,5b\n" \
		400	" .long 2b,6b\n" \
		401	".previous" \
		402	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		403	: "1"(from), "2"(to), "0"(size/4) \
		404	: "memory"); \
		405	break; \
		406	} \
		407	} while (0)
		408
		409	/* Optimize just a little bit when we know the size of the move. */
		410	#define __constant_copy_user_zeroing(to, from, size) \
		411	do { \
		412	int __d0, __d1; \
		413	switch (size & 3) { \
		414	default: \
		415	__asm__ __volatile__( \
		416	"0: rep; movsl\n" \
		417	"1:\n" \
		418	".section .fixup,\"ax\"\n" \
		419	"2: pushl %0\n" \
		420	" pushl %%eax\n" \
		421	" xorl %%eax,%%eax\n" \
		422	" rep; stosl\n" \
		423	" popl %%eax\n" \
		424	" popl %0\n" \
		425	" shl $2,%0\n" \
		426	" jmp 1b\n" \
		427	".previous\n" \
		428	".section __ex_table,\"a\"\n" \
		429	" .align 4\n" \
		430	" .long 0b,2b\n" \
		431	".previous" \
		432	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		433	: "1"(from), "2"(to), "0"(size/4) \
		434	: "memory"); \
		435	break; \
		436	case 1: \
		437	__asm__ __volatile__( \
		438	"0: rep; movsl\n" \
		439	"1: movsb\n" \
		440	"2:\n" \
		441	".section .fixup,\"ax\"\n" \
		442	"3: pushl %0\n" \
		443	" pushl %%eax\n" \
		444	" xorl %%eax,%%eax\n" \
		445	" rep; stosl\n" \
		446	" stosb\n" \
		447	" popl %%eax\n" \
		448	" popl %0\n" \
		449	" shl $2,%0\n" \
		450	" incl %0\n" \
		451	" jmp 2b\n" \
		452	"4: pushl %%eax\n" \
		453	" xorl %%eax,%%eax\n" \
		454	" stosb\n" \
		455	" popl %%eax\n" \
		456	" incl %0\n" \
		457	" jmp 2b\n" \
		458	".previous\n" \
		459	".section __ex_table,\"a\"\n" \
		460	" .align 4\n" \
		461	" .long 0b,3b\n" \
		462	" .long 1b,4b\n" \
		463	".previous" \
		464	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		465	: "1"(from), "2"(to), "0"(size/4) \
		466	: "memory"); \
		467	break; \
		468	case 2: \
		469	__asm__ __volatile__( \
		470	"0: rep; movsl\n" \
		471	"1: movsw\n" \
		472	"2:\n" \
		473	".section .fixup,\"ax\"\n" \
		474	"3: pushl %0\n" \
		475	" pushl %%eax\n" \
		476	" xorl %%eax,%%eax\n" \
		477	" rep; stosl\n" \
		478	" stosw\n" \
		479	" popl %%eax\n" \
		480	" popl %0\n" \
		481	" shl $2,%0\n" \
		482	" addl $2,%0\n" \
		483	" jmp 2b\n" \
		484	"4: pushl %%eax\n" \
		485	" xorl %%eax,%%eax\n" \
		486	" stosw\n" \
		487	" popl %%eax\n" \
		488	" addl $2,%0\n" \
		489	" jmp 2b\n" \
		490	".previous\n" \
		491	".section __ex_table,\"a\"\n" \
		492	" .align 4\n" \
		493	" .long 0b,3b\n" \
		494	" .long 1b,4b\n" \
		495	".previous" \
		496	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		497	: "1"(from), "2"(to), "0"(size/4) \
		498	: "memory"); \
		499	break; \
		500	case 3: \
		501	__asm__ __volatile__( \
		502	"0: rep; movsl\n" \
		503	"1: movsw\n" \
		504	"2: movsb\n" \
		505	"3:\n" \
		506	".section .fixup,\"ax\"\n" \
		507	"4: pushl %0\n" \
		508	" pushl %%eax\n" \
		509	" xorl %%eax,%%eax\n" \
		510	" rep; stosl\n" \
		511	" stosw\n" \
		512	" stosb\n" \
		513	" popl %%eax\n" \
		514	" popl %0\n" \
		515	" shl $2,%0\n" \
		516	" addl $3,%0\n" \
		517	" jmp 2b\n" \
		518	"5: pushl %%eax\n" \
		519	" xorl %%eax,%%eax\n" \
		520	" stosw\n" \
		521	" stosb\n" \
		522	" popl %%eax\n" \
		523	" addl $3,%0\n" \
		524	" jmp 2b\n" \
		525	"6: pushl %%eax\n" \
		526	" xorl %%eax,%%eax\n" \
		527	" stosb\n" \
		528	" popl %%eax\n" \
		529	" incl %0\n" \
		530	" jmp 2b\n" \
		531	".previous\n" \
		532	".section __ex_table,\"a\"\n" \
		533	" .align 4\n" \
		534	" .long 0b,4b\n" \
		535	" .long 1b,5b\n" \
		536	" .long 2b,6b\n" \
		537	".previous" \
		538	: "=c"(size), "=&S" (__d0), "=&D" (__d1)\
		539	: "1"(from), "2"(to), "0"(size/4) \
		540	: "memory"); \
		541	break; \
		542	} \
		543	} while (0)
		544
		545	unsigned long __generic_copy_to_user(void , const void , unsigned long);
		546	unsigned long __generic_copy_from_user(void , const void , unsigned long);
		547
		548	static inline unsigned long
		549	__constant_copy_to_user(void to, const void from, unsigned long n)
		550	{
		551	if (access_ok(VERIFY_WRITE, to, n))
		552	__constant_copy_user(to,from,n);
		553	return n;
		554	}
		555
		556	static inline unsigned long
		557	__constant_copy_from_user(void to, const void from, unsigned long n)
		558	{
		559	if (access_ok(VERIFY_READ, from, n))
		560	__constant_copy_user_zeroing(to,from,n);
		561	return n;
		562	}
		563
		564	static inline unsigned long
		565	__constant_copy_to_user_nocheck(void to, const void from, unsigned long n)
		566	{
		567	__constant_copy_user(to,from,n);
		568	return n;
		569	}
		570
		571	static inline unsigned long
		572	__constant_copy_from_user_nocheck(void to, const void from, unsigned long n)
		573	{
		574	__constant_copy_user_zeroing(to,from,n);
		575	return n;
		576	}
		577
		578	#define copy_to_user(to,from,n) \
		579	(__builtin_constant_p(n) ? \
		580	__constant_copy_to_user((to),(from),(n)) : \
		581	__generic_copy_to_user((to),(from),(n)))
		582
		583	#define copy_from_user(to,from,n) \
		584	(__builtin_constant_p(n) ? \
		585	__constant_copy_from_user((to),(from),(n)) : \
		586	__generic_copy_from_user((to),(from),(n)))
		587
		588	#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
		589
		590	#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
		591
		592	#define __copy_to_user(to,from,n) \
		593	(__builtin_constant_p(n) ? \
		594	__constant_copy_to_user_nocheck((to),(from),(n)) : \
		595	__generic_copy_to_user_nocheck((to),(from),(n)))
		596
		597	#define __copy_from_user(to,from,n) \
		598	(__builtin_constant_p(n) ? \
		599	__constant_copy_from_user_nocheck((to),(from),(n)) : \
		600	__generic_copy_from_user_nocheck((to),(from),(n)))
		601
		602	long strncpy_from_user(char dst, const char src, long count);
		603	long __strncpy_from_user(char dst, const char src, long count);
		604	#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
		605	long strnlen_user(const char *str, long n);
		606	unsigned long clear_user(void *mem, unsigned long len);
		607	unsigned long __clear_user(void *mem, unsigned long len);
		608
		609	#endif
		610	#endif /* __i386_UACCESS_H */

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(root)/shark/branches/xen/drivers/net/include/asm/uaccess.h - Rev 1618