diff options
Diffstat (limited to 'include/asm-x86/uaccess_32.h')
| -rw-r--r-- | include/asm-x86/uaccess_32.h | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/include/asm-x86/uaccess_32.h b/include/asm-x86/uaccess_32.h index 2676b48..92ad19e 100644 --- a/include/asm-x86/uaccess_32.h +++ b/include/asm-x86/uaccess_32.h @@ -11,29 +11,6 @@ #include <asm/asm.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(-1UL) -#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) - /* * movsl can be slow when source and dest are not both 8-byte aligned */ @@ -47,91 +24,6 @@ extern struct movsl_mask { ((unsigned long __force)(addr) < \ (current_thread_info()->addr_limit.seg)) -/* - * Test whether a block of memory is a valid user space address. - * Returns 0 if the range is valid, nonzero otherwise. - * - * This is equivalent to the following test: - * (u33)addr + (u33)size >= (u33)current->addr_limit.seg - * - * This needs 33-bit arithmetic. We have a carry... - */ -#define __range_not_ok(addr, size) \ -({ \ - unsigned long flag, roksum; \ - __chk_user_ptr(addr); \ - asm("add %3,%1 ; sbb %0,%0; cmp %1,%4; sbb $0,%0" \ - :"=&r" (flag), "=r" (roksum) \ - :"1" (addr), "g" ((long)(size)), \ - "rm" (current_thread_info()->addr_limit.seg)); \ - flag; \ -}) - -/** - * access_ok: - Checks if a user space pointer is valid - * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that - * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe - * to write to a block, it is always safe to read from it. - * @addr: User space pointer to start of block to check - * @size: Size of block to check - * - * Context: User context only. This function may sleep. - * - * Checks if a pointer to a block of memory in user space is valid. - * - * Returns true (nonzero) if the memory block may be valid, false (zero) - * if it is definitely invalid. - * - * Note that, depending on architecture, this function probably just - * checks that the pointer is in the user space range - after calling - * this function, memory access functions may still return -EFAULT. - */ -#define access_ok(type, addr, size) (likely(__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; -}; - -extern int fixup_exception(struct pt_regs *regs); - -/* - * 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). - */ - -extern void __get_user_1(void); -extern void __get_user_2(void); -extern void __get_user_4(void); - -#define __get_user_x(size, ret, x, ptr) \ - asm volatile("call __get_user_" #size \ - :"=a" (ret),"=d" (x) \ - :"0" (ptr)) - - /* Careful: we have to cast the result to the type of the pointer * for sign reasons */ @@ -386,8 +278,6 @@ struct __large_struct { unsigned long buf[100]; }; __gu_err; \ }) -extern long __get_user_bad(void); - #define __get_user_size(x, ptr, size, retval, errret) \ do { \ retval = 0; \ |
