summaryrefslogtreecommitdiff
path: root/include/asm-v850/uaccess.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-v850/uaccess.h')
-rw-r--r--include/asm-v850/uaccess.h165
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 000000000000..4386cfc6a8dd
--- /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__ */