294 lines
11 KiB
C
294 lines
11 KiB
C
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#ifndef _ASMARM_UACCESS_H
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#define _ASMARM_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/sched.h>
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#include <asm/errno.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry
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{
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unsigned long insn, fixup;
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};
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table(unsigned long);
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extern int fixup_exception(struct pt_regs *regs);
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current_thread_info()->addr_limit)
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#define segment_eq(a,b) ((a) == (b))
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#include <asm/uaccess-asm.h>
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#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
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/*
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* Single-value transfer routines. They automatically use the right
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* size if we just have the right pointer type. Note that the functions
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* which read from user space (*get_*) need to take care not to leak
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* kernel data even if the calling code is buggy and fails to check
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* the return value. This means zeroing out the destination variable
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* or buffer on error. Normally this is done out of line by the
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* fixup code, but there are a few places where it intrudes on the
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* main code path. When we only write to user space, there is no
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* problem.
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*
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* The "__xxx" versions of the user access functions do not verify the
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* address space - it must have been done previously with a separate
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* "access_ok()" call.
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*
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* The "xxx_error" versions set the third argument to EFAULT if an
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* error occurs, and leave it unchanged on success. Note that these
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* versions are void (ie, don't return a value as such).
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*/
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extern int __get_user_1(void *);
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extern int __get_user_2(void *);
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extern int __get_user_4(void *);
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extern int __get_user_8(void *);
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extern int __get_user_bad(void);
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#define __get_user_x(__r1,__p,__e,__s,__i...) \
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__asm__ __volatile__ ("bl __get_user_" #__s \
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: "=&r" (__e), "=r" (__r1) \
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: "0" (__p) \
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: __i)
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#define get_user(x,p) \
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({ \
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const register typeof(*(p)) *__p asm("r0") = (p); \
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register typeof(*(p)) __r1 asm("r1"); \
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register int __e asm("r0"); \
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switch (sizeof(*(p))) { \
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case 1: \
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__get_user_x(__r1, __p, __e, 1, "lr"); \
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break; \
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case 2: \
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__get_user_x(__r1, __p, __e, 2, "r2", "lr"); \
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break; \
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case 4: \
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__get_user_x(__r1, __p, __e, 4, "lr"); \
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break; \
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case 8: \
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__get_user_x(__r1, __p, __e, 8, "lr"); \
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break; \
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default: __e = __get_user_bad(); break; \
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} \
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x = __r1; \
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__e; \
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})
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#define __get_user(x,ptr) \
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({ \
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long __gu_err = 0; \
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__get_user_err((x),(ptr),__gu_err); \
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__gu_err; \
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})
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#define __get_user_error(x,ptr,err) \
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({ \
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__get_user_err((x),(ptr),err); \
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(void) 0; \
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})
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#define __get_user_err(x,ptr,err) \
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do { \
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unsigned long __gu_addr = (unsigned long)(ptr); \
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unsigned long __gu_val; \
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switch (sizeof(*(ptr))) { \
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case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
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case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
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case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
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default: (__gu_val) = __get_user_bad(); \
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} \
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(x) = (__typeof__(*(ptr)))__gu_val; \
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} while (0)
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extern int __put_user_1(void *, unsigned int);
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extern int __put_user_2(void *, unsigned int);
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extern int __put_user_4(void *, unsigned int);
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extern int __put_user_8(void *, unsigned long long);
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extern int __put_user_bad(void);
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#define __put_user_x(__r1,__p,__e,__s) \
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__asm__ __volatile__ ( \
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__asmeq("%0", "r0") __asmeq("%2", "r1") \
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"bl __put_user_" #__s \
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: "=&r" (__e) \
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: "0" (__p), "r" (__r1) \
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: "ip", "lr", "cc")
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#define put_user(x,p) \
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({ \
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const register typeof(*(p)) __r1 asm("r1") = (x); \
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const register typeof(*(p)) *__p asm("r0") = (p); \
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register int __e asm("r0"); \
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switch (sizeof(*(__p))) { \
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case 1: \
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__put_user_x(__r1, __p, __e, 1); \
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break; \
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case 2: \
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__put_user_x(__r1, __p, __e, 2); \
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break; \
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case 4: \
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__put_user_x(__r1, __p, __e, 4); \
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break; \
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case 8: \
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__put_user_x(__r1, __p, __e, 8); \
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break; \
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default: __e = __put_user_bad(); break; \
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} \
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__e; \
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})
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#if 0
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/********************* OLD METHOD *******************/
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#define __put_user_x(__r1,__p,__e,__s,__i...) \
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__asm__ __volatile__ ("bl __put_user_" #__s \
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: "=&r" (__e) \
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: "0" (__p), "r" (__r1) \
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: __i)
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#define put_user(x,p) \
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({ \
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const register typeof(*(p)) __r1 asm("r1") = (x); \
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const register typeof(*(p)) *__p asm("r0") = (p); \
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register int __e asm("r0"); \
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switch (sizeof(*(p))) { \
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case 1: \
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__put_user_x(__r1, __p, __e, 1, "r2", "lr"); \
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break; \
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case 2: \
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__put_user_x(__r1, __p, __e, 2, "r2", "lr"); \
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break; \
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case 4: \
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__put_user_x(__r1, __p, __e, 4, "r2", "lr"); \
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break; \
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case 8: \
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__put_user_x(__r1, __p, __e, 8, "r2", "ip", "lr"); \
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break; \
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default: __e = __put_user_bad(); break; \
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} \
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__e; \
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})
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/*************************************************/
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#endif
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#define __put_user(x,ptr) \
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({ \
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long __pu_err = 0; \
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__put_user_err((x),(ptr),__pu_err); \
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__pu_err; \
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})
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#define __put_user_error(x,ptr,err) \
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({ \
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__put_user_err((x),(ptr),err); \
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(void) 0; \
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})
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#define __put_user_err(x,ptr,err) \
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do { \
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unsigned long __pu_addr = (unsigned long)(ptr); \
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__typeof__(*(ptr)) __pu_val = (x); \
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switch (sizeof(*(ptr))) { \
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case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
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case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
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case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
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case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
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default: __put_user_bad(); \
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} \
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} while (0)
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static __inline__ unsigned long copy_from_user(void *to, const void *from, unsigned long n)
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{
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if (access_ok(VERIFY_READ, from, n))
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__do_copy_from_user(to, from, n);
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else /* security hole - plug it */
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memzero(to, n);
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return n;
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}
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static __inline__ unsigned long __copy_from_user(void *to, const void *from, unsigned long n)
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{
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__do_copy_from_user(to, from, n);
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return n;
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}
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static __inline__ unsigned long copy_to_user(void *to, const void *from, unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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__do_copy_to_user(to, from, n);
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return n;
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}
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static __inline__ unsigned long __copy_to_user(void *to, const void *from, unsigned long n)
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{
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__do_copy_to_user(to, from, n);
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return n;
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}
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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static __inline__ unsigned long clear_user (void *to, unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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__do_clear_user(to, n);
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return n;
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}
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static __inline__ unsigned long __clear_user (void *to, unsigned long n)
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{
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__do_clear_user(to, n);
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return n;
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}
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static __inline__ long strncpy_from_user (char *dst, const char *src, long count)
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{
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long res = -EFAULT;
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if (access_ok(VERIFY_READ, src, 1))
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__do_strncpy_from_user(dst, src, count, res);
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return res;
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}
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static __inline__ long __strncpy_from_user (char *dst, const char *src, long count)
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{
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long res;
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__do_strncpy_from_user(dst, src, count, res);
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return res;
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}
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#define strlen_user(s) strnlen_user(s, ~0UL >> 1)
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static inline long strnlen_user(const char *s, long n)
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{
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unsigned long res = 0;
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if (__addr_ok(s))
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__do_strnlen_user(s, n, res);
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return res;
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}
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#endif /* _ASMARM_UACCESS_H */
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