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Diffstat (limited to 'include/asm-v850/uaccess.h')
| -rw-r--r-- | include/asm-v850/uaccess.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/include/asm-v850/uaccess.h b/include/asm-v850/uaccess.h new file mode 100644 index 00000000000..4386cfc6a8d --- /dev/null +++ b/include/asm-v850/uaccess.h @@ -0,0 +1,165 @@ +#ifndef __V850_UACCESS_H__ +#define __V850_UACCESS_H__ + +/* + * User space memory access functions + */ + +#include <linux/errno.h> +#include <linux/string.h> + +#include <asm/segment.h> +#include <asm/machdep.h> + +#define VERIFY_READ 0 +#define VERIFY_WRITE 1 + +extern inline int access_ok (int type, const void *addr, unsigned long size) +{ + /* XXX I guess we should check against real ram bounds at least, and + possibly make sure ADDR is not within the kernel. + For now we just check to make sure it's not a small positive + or negative value, as that will at least catch some kinds of + error. In particular, we make sure that ADDR's not within the + interrupt vector area, which we know starts at zero, or within the + peripheral-I/O area, which is located just _before_ zero. */ + unsigned long val = (unsigned long)addr; + return val >= (0x80 + NUM_CPU_IRQS*16) && val < 0xFFFFF000; +} + +/* this function will go away soon - use access_ok() instead */ +extern inline int __deprecated verify_area (int type, const void *addr, unsigned long size) +{ + return access_ok (type, addr, size) ? 0 : -EFAULT; +} + +/* + * 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); + + +/* + * These are the main single-value transfer routines. They automatically + * use the right size if we just have the right pointer type. + */ + +extern int bad_user_access_length (void); + +#define __get_user(var, ptr) \ + ({ \ + int __gu_err = 0; \ + typeof(*(ptr)) __gu_val = 0; \ + switch (sizeof (*(ptr))) { \ + case 1: \ + case 2: \ + case 4: \ + __gu_val = *(ptr); \ + break; \ + case 8: \ + memcpy(&__gu_val, ptr, sizeof(__gu_val)); \ + break; \ + default: \ + __gu_val = 0; \ + __gu_err = __get_user_bad (); \ + break; \ + } \ + (var) = __gu_val; \ + __gu_err; \ + }) +#define __get_user_bad() (bad_user_access_length (), (-EFAULT)) + +#define __put_user(var, ptr) \ + ({ \ + int __pu_err = 0; \ + switch (sizeof (*(ptr))) { \ + case 1: \ + case 2: \ + case 4: \ + *(ptr) = (var); \ + break; \ + case 8: { \ + typeof(*(ptr)) __pu_val = 0; \ + memcpy(ptr, &__pu_val, sizeof(__pu_val)); \ + } \ + break; \ + default: \ + __pu_err = __put_user_bad (); \ + break; \ + } \ + __pu_err; \ + }) +#define __put_user_bad() (bad_user_access_length (), (-EFAULT)) + +#define put_user(x, ptr) __put_user(x, ptr) +#define get_user(x, ptr) __get_user(x, ptr) + +#define __copy_from_user(to, from, n) (memcpy (to, from, n), 0) +#define __copy_to_user(to, from, n) (memcpy(to, from, n), 0) + +#define __copy_to_user_inatomic __copy_to_user +#define __copy_from_user_inatomic __copy_from_user + +#define copy_from_user(to, from, n) __copy_from_user (to, from, n) +#define copy_to_user(to, from, n) __copy_to_user(to, from, n) + +#define copy_to_user_ret(to,from,n,retval) \ + ({ if (copy_to_user (to,from,n)) return retval; }) + +#define copy_from_user_ret(to,from,n,retval) \ + ({ if (copy_from_user (to,from,n)) return retval; }) + +/* + * Copy a null terminated string from userspace. + */ + +static inline long +strncpy_from_user (char *dst, const char *src, long count) +{ + char *tmp; + strncpy (dst, src, count); + for (tmp = dst; *tmp && count > 0; tmp++, count--) + ; + return tmp - dst; +} + +/* + * Return the size of a string (including the ending 0) + * + * Return 0 on exception, a value greater than N if too long + */ +static inline long strnlen_user (const char *src, long n) +{ + return strlen (src) + 1; +} + +#define strlen_user(str) strnlen_user (str, 32767) + +/* + * Zero Userspace + */ + +static inline unsigned long +clear_user (void *to, unsigned long n) +{ + memset (to, 0, n); + return 0; +} + +#endif /* __V850_UACCESS_H__ */ |