diff options
Diffstat (limited to 'include/asm-arm26/uaccess.h')
| -rw-r--r-- | include/asm-arm26/uaccess.h | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/include/asm-arm26/uaccess.h b/include/asm-arm26/uaccess.h new file mode 100644 index 000000000000..ab9ce38c6aec --- /dev/null +++ b/include/asm-arm26/uaccess.h @@ -0,0 +1,299 @@ +#ifndef _ASMARM_UACCESS_H +#define _ASMARM_UACCESS_H + +/* + * User space memory access functions + */ +#include <linux/sched.h> +#include <asm/errno.h> + +#define VERIFY_READ 0 +#define VERIFY_WRITE 1 + +/* + * 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; +}; + +/* Returns 0 if exception not found and fixup otherwise. */ +extern unsigned long search_exception_table(unsigned long); +extern int fixup_exception(struct pt_regs *regs); + +#define get_ds() (KERNEL_DS) +#define get_fs() (current_thread_info()->addr_limit) +#define segment_eq(a,b) ((a) == (b)) + +#include <asm/uaccess-asm.h> + +#define access_ok(type,addr,size) (__range_ok(addr,size) == 0) + +/* this function will go away soon - use access_ok() instead */ +static inline int __deprecated verify_area(int type, const void * addr, unsigned long size) +{ + return access_ok(type, addr, size) ? 0 : -EFAULT; +} + +/* + * Single-value transfer routines. They automatically use the right + * size if we just have the right pointer type. Note that the functions + * which read from user space (*get_*) need to take care not to leak + * kernel data even if the calling code is buggy and fails to check + * the return value. This means zeroing out the destination variable + * or buffer on error. Normally this is done out of line by the + * fixup code, but there are a few places where it intrudes on the + * main code path. When we only write to user space, there is no + * problem. + * + * The "__xxx" versions of the user access functions do not verify the + * address space - it must have been done previously with a separate + * "access_ok()" call. + * + * The "xxx_error" versions set the third argument to EFAULT if an + * error occurs, and leave it unchanged on success. Note that these + * versions are void (ie, don't return a value as such). + */ + +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_x(__r1,__p,__e,__s,__i...) \ + __asm__ __volatile__ ("bl __get_user_" #__s \ + : "=&r" (__e), "=r" (__r1) \ + : "0" (__p) \ + : __i) + +#define get_user(x,p) \ + ({ \ + const register typeof(*(p)) *__p asm("r0") = (p); \ + register typeof(*(p)) __r1 asm("r1"); \ + register int __e asm("r0"); \ + switch (sizeof(*(p))) { \ + case 1: \ + __get_user_x(__r1, __p, __e, 1, "lr"); \ + break; \ + case 2: \ + __get_user_x(__r1, __p, __e, 2, "r2", "lr"); \ + break; \ + case 4: \ + __get_user_x(__r1, __p, __e, 4, "lr"); \ + break; \ + case 8: \ + __get_user_x(__r1, __p, __e, 8, "lr"); \ + break; \ + default: __e = __get_user_bad(); break; \ + } \ + x = __r1; \ + __e; \ + }) + + +#define __get_user(x,ptr) \ +({ \ + long __gu_err = 0; \ + __get_user_err((x),(ptr),__gu_err); \ + __gu_err; \ +}) + +#define __get_user_error(x,ptr,err) \ +({ \ + __get_user_err((x),(ptr),err); \ + (void) 0; \ +}) + +#define __get_user_err(x,ptr,err) \ +do { \ + unsigned long __gu_addr = (unsigned long)(ptr); \ + unsigned long __gu_val; \ + switch (sizeof(*(ptr))) { \ + case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \ + case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \ + case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \ + default: (__gu_val) = __get_user_bad(); \ + } \ + (x) = (__typeof__(*(ptr)))__gu_val; \ +} while (0) + +extern int __put_user_1(void *, unsigned int); +extern int __put_user_2(void *, unsigned int); +extern int __put_user_4(void *, unsigned int); +extern int __put_user_8(void *, unsigned long long); +extern int __put_user_bad(void); + +#define __put_user_x(__r1,__p,__e,__s) \ + __asm__ __volatile__ ( \ + __asmeq("%0", "r0") __asmeq("%2", "r1") \ + "bl __put_user_" #__s \ + : "=&r" (__e) \ + : "0" (__p), "r" (__r1) \ + : "ip", "lr", "cc") + +#define put_user(x,p) \ + ({ \ + const register typeof(*(p)) __r1 asm("r1") = (x); \ + const register typeof(*(p)) *__p asm("r0") = (p); \ + register int __e asm("r0"); \ + switch (sizeof(*(__p))) { \ + case 1: \ + __put_user_x(__r1, __p, __e, 1); \ + break; \ + case 2: \ + __put_user_x(__r1, __p, __e, 2); \ + break; \ + case 4: \ + __put_user_x(__r1, __p, __e, 4); \ + break; \ + case 8: \ + __put_user_x(__r1, __p, __e, 8); \ + break; \ + default: __e = __put_user_bad(); break; \ + } \ + __e; \ + }) + +#if 0 +/********************* OLD METHOD *******************/ +#define __put_user_x(__r1,__p,__e,__s,__i...) \ + __asm__ __volatile__ ("bl __put_user_" #__s \ + : "=&r" (__e) \ + : "0" (__p), "r" (__r1) \ + : __i) + +#define put_user(x,p) \ + ({ \ + const register typeof(*(p)) __r1 asm("r1") = (x); \ + const register typeof(*(p)) *__p asm("r0") = (p); \ + register int __e asm("r0"); \ + switch (sizeof(*(p))) { \ + case 1: \ + __put_user_x(__r1, __p, __e, 1, "r2", "lr"); \ + break; \ + case 2: \ + __put_user_x(__r1, __p, __e, 2, "r2", "lr"); \ + break; \ + case 4: \ + __put_user_x(__r1, __p, __e, 4, "r2", "lr"); \ + break; \ + case 8: \ + __put_user_x(__r1, __p, __e, 8, "r2", "ip", "lr"); \ + break; \ + default: __e = __put_user_bad(); break; \ + } \ + __e; \ + }) +/*************************************************/ +#endif + +#define __put_user(x,ptr) \ +({ \ + long __pu_err = 0; \ + __put_user_err((x),(ptr),__pu_err); \ + __pu_err; \ +}) + +#define __put_user_error(x,ptr,err) \ +({ \ + __put_user_err((x),(ptr),err); \ + (void) 0; \ +}) + +#define __put_user_err(x,ptr,err) \ +do { \ + unsigned long __pu_addr = (unsigned long)(ptr); \ + __typeof__(*(ptr)) __pu_val = (x); \ + switch (sizeof(*(ptr))) { \ + case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \ + case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \ + case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \ + case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \ + default: __put_user_bad(); \ + } \ +} while (0) + +static __inline__ unsigned long copy_from_user(void *to, const void *from, unsigned long n) +{ + if (access_ok(VERIFY_READ, from, n)) + __do_copy_from_user(to, from, n); + else /* security hole - plug it */ + memzero(to, n); + return n; +} + +static __inline__ unsigned long __copy_from_user(void *to, const void *from, unsigned long n) +{ + __do_copy_from_user(to, from, n); + return n; +} + +static __inline__ unsigned long copy_to_user(void *to, const void *from, unsigned long n) +{ + if (access_ok(VERIFY_WRITE, to, n)) + __do_copy_to_user(to, from, n); + return n; +} + +static __inline__ unsigned long __copy_to_user(void *to, const void *from, unsigned long n) +{ + __do_copy_to_user(to, from, n); + return n; +} + +#define __copy_to_user_inatomic __copy_to_user +#define __copy_from_user_inatomic __copy_from_user + +static __inline__ unsigned long clear_user (void *to, unsigned long n) +{ + if (access_ok(VERIFY_WRITE, to, n)) + __do_clear_user(to, n); + return n; +} + +static __inline__ unsigned long __clear_user (void *to, unsigned long n) +{ + __do_clear_user(to, n); + return n; +} + +static __inline__ long strncpy_from_user (char *dst, const char *src, long count) +{ + long res = -EFAULT; + if (access_ok(VERIFY_READ, src, 1)) + __do_strncpy_from_user(dst, src, count, res); + return res; +} + +static __inline__ long __strncpy_from_user (char *dst, const char *src, long count) +{ + long res; + __do_strncpy_from_user(dst, src, count, res); + return res; +} + +#define strlen_user(s) strnlen_user(s, ~0UL >> 1) + +static inline long strnlen_user(const char *s, long n) +{ + unsigned long res = 0; + + if (__addr_ok(s)) + __do_strnlen_user(s, n, res); + + return res; +} + +#endif /* _ASMARM_UACCESS_H */ |