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-rw-r--r--include/asm-arm26/uaccess.h299
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 00000000000..ab9ce38c6ae
--- /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 */
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