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Diffstat (limited to 'include/asm-x86_64/uaccess.h')
| -rw-r--r-- | include/asm-x86_64/uaccess.h | 384 |
1 files changed, 0 insertions, 384 deletions
diff --git a/include/asm-x86_64/uaccess.h b/include/asm-x86_64/uaccess.h deleted file mode 100644 index f4ce8768ad44..000000000000 --- a/include/asm-x86_64/uaccess.h +++ /dev/null @@ -1,384 +0,0 @@ -#ifndef __X86_64_UACCESS_H -#define __X86_64_UACCESS_H - -/* - * User space memory access functions - */ -#include <linux/compiler.h> -#include <linux/errno.h> -#include <linux/prefetch.h> -#include <asm/page.h> - -#define VERIFY_READ 0 -#define VERIFY_WRITE 1 - -/* - * The fs value determines whether argument validity checking should be - * performed or not. If get_fs() == USER_DS, checking is performed, with - * get_fs() == KERNEL_DS, checking is bypassed. - * - * For historical reasons, these macros are grossly misnamed. - */ - -#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) - -#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFFFFFFFFFUL) -#define USER_DS MAKE_MM_SEG(PAGE_OFFSET) - -#define get_ds() (KERNEL_DS) -#define get_fs() (current_thread_info()->addr_limit) -#define set_fs(x) (current_thread_info()->addr_limit = (x)) - -#define segment_eq(a,b) ((a).seg == (b).seg) - -#define __addr_ok(addr) (!((unsigned long)(addr) & (current_thread_info()->addr_limit.seg))) - -/* - * Uhhuh, this needs 65-bit arithmetic. We have a carry.. - */ -#define __range_not_ok(addr,size) ({ \ - unsigned long flag,roksum; \ - __chk_user_ptr(addr); \ - asm("# range_ok\n\r" \ - "addq %3,%1 ; sbbq %0,%0 ; cmpq %1,%4 ; sbbq $0,%0" \ - :"=&r" (flag), "=r" (roksum) \ - :"1" (addr),"g" ((long)(size)),"g" (current_thread_info()->addr_limit.seg)); \ - flag; }) - -#define access_ok(type, addr, size) (__range_not_ok(addr,size) == 0) - -/* - * 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 long insn, fixup; -}; - -#define ARCH_HAS_SEARCH_EXTABLE - -/* - * These are 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. - * - * The "__xxx" versions of the user access functions are versions that - * do not verify the address space, that must have been done previously - * with a separate "access_ok()" call (this is used when we do multiple - * accesses to the same area of user memory). - */ - -#define __get_user_x(size,ret,x,ptr) \ - asm volatile("call __get_user_" #size \ - :"=a" (ret),"=d" (x) \ - :"c" (ptr) \ - :"r8") - -/* Careful: we have to cast the result to the type of the pointer for sign reasons */ -#define get_user(x,ptr) \ -({ unsigned long __val_gu; \ - int __ret_gu; \ - __chk_user_ptr(ptr); \ - switch(sizeof (*(ptr))) { \ - case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \ - case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \ - case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \ - case 8: __get_user_x(8,__ret_gu,__val_gu,ptr); break; \ - default: __get_user_bad(); break; \ - } \ - (x) = (__force typeof(*(ptr)))__val_gu; \ - __ret_gu; \ -}) - -extern void __put_user_1(void); -extern void __put_user_2(void); -extern void __put_user_4(void); -extern void __put_user_8(void); -extern void __put_user_bad(void); - -#define __put_user_x(size,ret,x,ptr) \ - asm volatile("call __put_user_" #size \ - :"=a" (ret) \ - :"c" (ptr),"d" (x) \ - :"r8") - -#define put_user(x,ptr) \ - __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) - -#define __get_user(x,ptr) \ - __get_user_nocheck((x),(ptr),sizeof(*(ptr))) -#define __put_user(x,ptr) \ - __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) - -#define __get_user_unaligned __get_user -#define __put_user_unaligned __put_user - -#define __put_user_nocheck(x,ptr,size) \ -({ \ - int __pu_err; \ - __put_user_size((x),(ptr),(size),__pu_err); \ - __pu_err; \ -}) - - -#define __put_user_check(x,ptr,size) \ -({ \ - int __pu_err; \ - typeof(*(ptr)) __user *__pu_addr = (ptr); \ - switch (size) { \ - case 1: __put_user_x(1,__pu_err,x,__pu_addr); break; \ - case 2: __put_user_x(2,__pu_err,x,__pu_addr); break; \ - case 4: __put_user_x(4,__pu_err,x,__pu_addr); break; \ - case 8: __put_user_x(8,__pu_err,x,__pu_addr); break; \ - default: __put_user_bad(); \ - } \ - __pu_err; \ -}) - -#define __put_user_size(x,ptr,size,retval) \ -do { \ - retval = 0; \ - __chk_user_ptr(ptr); \ - switch (size) { \ - case 1: __put_user_asm(x,ptr,retval,"b","b","iq",-EFAULT); break;\ - case 2: __put_user_asm(x,ptr,retval,"w","w","ir",-EFAULT); break;\ - case 4: __put_user_asm(x,ptr,retval,"l","k","ir",-EFAULT); break;\ - case 8: __put_user_asm(x,ptr,retval,"q","","Zr",-EFAULT); break;\ - default: __put_user_bad(); \ - } \ -} while (0) - -/* FIXME: this hack is definitely wrong -AK */ -struct __large_struct { unsigned long buf[100]; }; -#define __m(x) (*(struct __large_struct __user *)(x)) - -/* - * Tell gcc we read from memory instead of writing: this is because - * we do not write to any memory gcc knows about, so there are no - * aliasing issues. - */ -#define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \ - asm volatile( \ - "1: mov"itype" %"rtype"1,%2\n" \ - "2:\n" \ - ".section .fixup,\"ax\"\n" \ - "3: mov %3,%0\n" \ - " jmp 2b\n" \ - ".previous\n" \ - ".section __ex_table,\"a\"\n" \ - " .align 8\n" \ - " .quad 1b,3b\n" \ - ".previous" \ - : "=r"(err) \ - : ltype (x), "m"(__m(addr)), "i"(errno), "0"(err)) - - -#define __get_user_nocheck(x,ptr,size) \ -({ \ - int __gu_err; \ - unsigned long __gu_val; \ - __get_user_size(__gu_val,(ptr),(size),__gu_err); \ - (x) = (__force typeof(*(ptr)))__gu_val; \ - __gu_err; \ -}) - -extern int __get_user_1(void); -extern int __get_user_2(void); -extern int __get_user_4(void); -extern int __get_user_8(void); -extern int __get_user_bad(void); - -#define __get_user_size(x,ptr,size,retval) \ -do { \ - retval = 0; \ - __chk_user_ptr(ptr); \ - switch (size) { \ - case 1: __get_user_asm(x,ptr,retval,"b","b","=q",-EFAULT); break;\ - case 2: __get_user_asm(x,ptr,retval,"w","w","=r",-EFAULT); break;\ - case 4: __get_user_asm(x,ptr,retval,"l","k","=r",-EFAULT); break;\ - case 8: __get_user_asm(x,ptr,retval,"q","","=r",-EFAULT); break;\ - default: (x) = __get_user_bad(); \ - } \ -} while (0) - -#define __get_user_asm(x, addr, err, itype, rtype, ltype, errno) \ - asm volatile( \ - "1: mov"itype" %2,%"rtype"1\n" \ - "2:\n" \ - ".section .fixup,\"ax\"\n" \ - "3: mov %3,%0\n" \ - " xor"itype" %"rtype"1,%"rtype"1\n" \ - " jmp 2b\n" \ - ".previous\n" \ - ".section __ex_table,\"a\"\n" \ - " .align 8\n" \ - " .quad 1b,3b\n" \ - ".previous" \ - : "=r"(err), ltype (x) \ - : "m"(__m(addr)), "i"(errno), "0"(err)) - -/* - * Copy To/From Userspace - */ - -/* Handles exceptions in both to and from, but doesn't do access_ok */ -__must_check unsigned long -copy_user_generic(void *to, const void *from, unsigned len); - -__must_check unsigned long -copy_to_user(void __user *to, const void *from, unsigned len); -__must_check unsigned long -copy_from_user(void *to, const void __user *from, unsigned len); -__must_check unsigned long -copy_in_user(void __user *to, const void __user *from, unsigned len); - -static __always_inline __must_check -int __copy_from_user(void *dst, const void __user *src, unsigned size) -{ - int ret = 0; - if (!__builtin_constant_p(size)) - return copy_user_generic(dst,(__force void *)src,size); - switch (size) { - case 1:__get_user_asm(*(u8*)dst,(u8 __user *)src,ret,"b","b","=q",1); - return ret; - case 2:__get_user_asm(*(u16*)dst,(u16 __user *)src,ret,"w","w","=r",2); - return ret; - case 4:__get_user_asm(*(u32*)dst,(u32 __user *)src,ret,"l","k","=r",4); - return ret; - case 8:__get_user_asm(*(u64*)dst,(u64 __user *)src,ret,"q","","=r",8); - return ret; - case 10: - __get_user_asm(*(u64*)dst,(u64 __user *)src,ret,"q","","=r",16); - if (unlikely(ret)) return ret; - __get_user_asm(*(u16*)(8+(char*)dst),(u16 __user *)(8+(char __user *)src),ret,"w","w","=r",2); - return ret; - case 16: - __get_user_asm(*(u64*)dst,(u64 __user *)src,ret,"q","","=r",16); - if (unlikely(ret)) return ret; - __get_user_asm(*(u64*)(8+(char*)dst),(u64 __user *)(8+(char __user *)src),ret,"q","","=r",8); - return ret; - default: - return copy_user_generic(dst,(__force void *)src,size); - } -} - -static __always_inline __must_check -int __copy_to_user(void __user *dst, const void *src, unsigned size) -{ - int ret = 0; - if (!__builtin_constant_p(size)) - return copy_user_generic((__force void *)dst,src,size); - switch (size) { - case 1:__put_user_asm(*(u8*)src,(u8 __user *)dst,ret,"b","b","iq",1); - return ret; - case 2:__put_user_asm(*(u16*)src,(u16 __user *)dst,ret,"w","w","ir",2); - return ret; - case 4:__put_user_asm(*(u32*)src,(u32 __user *)dst,ret,"l","k","ir",4); - return ret; - case 8:__put_user_asm(*(u64*)src,(u64 __user *)dst,ret,"q","","ir",8); - return ret; - case 10: - __put_user_asm(*(u64*)src,(u64 __user *)dst,ret,"q","","ir",10); - if (unlikely(ret)) return ret; - asm("":::"memory"); - __put_user_asm(4[(u16*)src],4+(u16 __user *)dst,ret,"w","w","ir",2); - return ret; - case 16: - __put_user_asm(*(u64*)src,(u64 __user *)dst,ret,"q","","ir",16); - if (unlikely(ret)) return ret; - asm("":::"memory"); - __put_user_asm(1[(u64*)src],1+(u64 __user *)dst,ret,"q","","ir",8); - return ret; - default: - return copy_user_generic((__force void *)dst,src,size); - } -} - -static __always_inline __must_check -int __copy_in_user(void __user *dst, const void __user *src, unsigned size) -{ - int ret = 0; - if (!__builtin_constant_p(size)) - return copy_user_generic((__force void *)dst,(__force void *)src,size); - switch (size) { - case 1: { - u8 tmp; - __get_user_asm(tmp,(u8 __user *)src,ret,"b","b","=q",1); - if (likely(!ret)) - __put_user_asm(tmp,(u8 __user *)dst,ret,"b","b","iq",1); - return ret; - } - case 2: { - u16 tmp; - __get_user_asm(tmp,(u16 __user *)src,ret,"w","w","=r",2); - if (likely(!ret)) - __put_user_asm(tmp,(u16 __user *)dst,ret,"w","w","ir",2); - return ret; - } - - case 4: { - u32 tmp; - __get_user_asm(tmp,(u32 __user *)src,ret,"l","k","=r",4); - if (likely(!ret)) - __put_user_asm(tmp,(u32 __user *)dst,ret,"l","k","ir",4); - return ret; - } - case 8: { - u64 tmp; - __get_user_asm(tmp,(u64 __user *)src,ret,"q","","=r",8); - if (likely(!ret)) - __put_user_asm(tmp,(u64 __user *)dst,ret,"q","","ir",8); - return ret; - } - default: - return copy_user_generic((__force void *)dst,(__force void *)src,size); - } -} - -__must_check long -strncpy_from_user(char *dst, const char __user *src, long count); -__must_check long -__strncpy_from_user(char *dst, const char __user *src, long count); -__must_check long strnlen_user(const char __user *str, long n); -__must_check long __strnlen_user(const char __user *str, long n); -__must_check long strlen_user(const char __user *str); -__must_check unsigned long clear_user(void __user *mem, unsigned long len); -__must_check unsigned long __clear_user(void __user *mem, unsigned long len); - -__must_check long __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size); - -static __must_check __always_inline int -__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size) -{ - return copy_user_generic((__force void *)dst, src, size); -} - -#define ARCH_HAS_NOCACHE_UACCESS 1 -extern long __copy_user_nocache(void *dst, const void __user *src, unsigned size, int zerorest); - -static inline int __copy_from_user_nocache(void *dst, const void __user *src, unsigned size) -{ - might_sleep(); - return __copy_user_nocache(dst, src, size, 1); -} - -static inline int __copy_from_user_inatomic_nocache(void *dst, const void __user *src, unsigned size) -{ - return __copy_user_nocache(dst, src, size, 0); -} - -#endif /* __X86_64_UACCESS_H */ |