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/arch/parisc/include/asm/uaccess.h

https://github.com/aicjofs/android_kernel_lge_v500_20d
C Header | 269 lines | 198 code | 38 blank | 33 comment | 15 complexity | cdd242f068672c95dea8013c2a6c2173 MD5 | raw file
  1#ifndef __PARISC_UACCESS_H
  2#define __PARISC_UACCESS_H
  3
  4/*
  5 * User space memory access functions
  6 */
  7#include <asm/page.h>
  8#include <asm/cache.h>
  9#include <asm/errno.h>
 10#include <asm-generic/uaccess-unaligned.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
 26 * parisc, we don't need to do anything for access_ok().
 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
 31extern int __get_kernel_bad(void);
 32extern int __get_user_bad(void);
 33extern int __put_kernel_bad(void);
 34extern int __put_user_bad(void);
 35
 36static inline long access_ok(int type, const void __user * addr,
 37		unsigned long size)
 38{
 39	return 1;
 40}
 41
 42#define put_user __put_user
 43#define get_user __get_user
 44
 45#if !defined(CONFIG_64BIT)
 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)
 50#define ASM_WORD_INSN		".word\t"
 51#else
 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"
 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
 65struct exception_table_entry {
 66	unsigned long insn;  /* address of insn that is allowed to fault.   */
 67	long fixup;          /* fixup routine */
 68};
 69
 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
 75/*
 76 * The page fault handler stores, in a per-cpu area, the following information
 77 * if a fixup routine is available.
 78 */
 79struct 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
113#define __get_kernel_asm(ldx,ptr)                       \
114	__asm__("\n1:\t" ldx "\t0(%2),%0\n\t"		\
115		ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
116		: "=r"(__gu_val), "=r"(__gu_err)        \
117		: "r"(ptr), "1"(__gu_err)		\
118		: "r1");
119
120#define __get_user_asm(ldx,ptr)                         \
121	__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t"	\
122		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
123		: "=r"(__gu_val), "=r"(__gu_err)        \
124		: "r"(ptr), "1"(__gu_err)		\
125		: "r1");
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
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.
162 */
163
164#define __put_kernel_asm(stx,x,ptr)                         \
165	__asm__ __volatile__ (                              \
166		"\n1:\t" stx "\t%2,0(%1)\n\t"		    \
167		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
168		: "=r"(__pu_err)                            \
169		: "r"(ptr), "r"(x), "0"(__pu_err)	    \
170	    	: "r1")
171
172#define __put_user_asm(stx,x,ptr)                           \
173	__asm__ __volatile__ (                              \
174		"\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t"	    \
175		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
176		: "=r"(__pu_err)                            \
177		: "r"(ptr), "r"(x), "0"(__pu_err)	    \
178		: "r1")
179
180
181#if !defined(CONFIG_64BIT)
182
183#define __put_kernel_asm64(__val,ptr) do {		    \
184	u64 __val64 = (u64)(__val);			    \
185	u32 hi = (__val64) >> 32;			    \
186	u32 lo = (__val64) & 0xffffffff;		    \
187	__asm__ __volatile__ (				    \
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)\
192		: "=r"(__pu_err)                            \
193		: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
194		: "r1");				    \
195} while (0)
196
197#define __put_user_asm64(__val,ptr) do {	    	    \
198	u64 __val64 = (u64)(__val);			    \
199	u32 hi = (__val64) >> 32;			    \
200	u32 lo = (__val64) & 0xffffffff;		    \
201	__asm__ __volatile__ (				    \
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)\
206		: "=r"(__pu_err)                            \
207		: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
208		: "r1");				    \
209} while (0)
210
211#endif /* !defined(CONFIG_64BIT) */
212
213
214/*
215 * Complex access routines -- external declarations
216 */
217
218extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
219extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
220extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
221extern long lstrncpy_from_user(char *, const char __user *, long);
222extern unsigned lclear_user(void __user *,unsigned long);
223extern 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
235unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
236#define __copy_to_user copy_to_user
237unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len);
238unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
239#define __copy_in_user copy_in_user
240#define __copy_to_user_inatomic __copy_to_user
241#define __copy_from_user_inatomic __copy_from_user
242
243extern void copy_from_user_overflow(void)
244#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
245        __compiletime_error("copy_from_user() buffer size is not provably correct")
246#else
247        __compiletime_warning("copy_from_user() buffer size is not provably correct")
248#endif
249;
250
251static inline unsigned long __must_check copy_from_user(void *to,
252                                          const void __user *from,
253                                          unsigned long n)
254{
255        int sz = __compiletime_object_size(to);
256        int ret = -EFAULT;
257
258        if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
259                ret = __copy_from_user(to, from, n);
260        else
261                copy_from_user_overflow();
262
263        return ret;
264}
265
266struct pt_regs;
267int fixup_exception(struct pt_regs *regs);
268
269#endif /* __PARISC_UACCESS_H */