__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
- mm_segment_t addr_limit; /* thread address space:
- 0-0xBFFFFFFF for user
- 0-0xFFFFFFFF for kernel */
struct thread_info *real_thread; /* Points to non-IRQ stack */
unsigned long aux_fp_regs[FP_SIZE]; /* auxiliary fp_regs to save/restore
them out-of-band */
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
.real_thread = NULL, \
}
#define __UM_UACCESS_H
#include <asm/elf.h>
+#include <asm/unaligned.h>
#define __under_task_size(addr, size) \
(((unsigned long) (addr) < TASK_SIZE) && \
{
return __addr_range_nowrap(addr, size) &&
(__under_task_size(addr, size) ||
- __access_ok_vsyscall(addr, size) ||
- uaccess_kernel());
+ __access_ok_vsyscall(addr, size));
}
+/* no pagefaults for kernel addresses in um */
+#define HAVE_GET_KERNEL_NOFAULT 1
+
+#define __get_kernel_nofault(dst, src, type, err_label) \
+do { \
+ *((type *)dst) = get_unaligned((type *)(src)); \
+ if (0) /* make sure the label looks used to the compiler */ \
+ goto err_label; \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label) \
+do { \
+ put_unaligned(*((type *)src), (type *)(dst)); \
+ if (0) /* make sure the label looks used to the compiler */ \
+ goto err_label; \
+} while (0)
+
#endif
unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
- if (uaccess_kernel()) {
- memcpy(to, (__force void*)from, n);
- return 0;
- }
-
return buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to);
}
EXPORT_SYMBOL(raw_copy_from_user);
unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
- if (uaccess_kernel()) {
- memcpy((__force void *) to, from, n);
- return 0;
- }
-
return buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from);
}
EXPORT_SYMBOL(raw_copy_to_user);
if (!access_ok(src, 1))
return -EFAULT;
-
- if (uaccess_kernel()) {
- strncpy(dst, (__force void *) src, count);
- return strnlen(dst, count);
- }
-
n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
&ptr);
if (n != 0)
unsigned long __clear_user(void __user *mem, unsigned long len)
{
- if (uaccess_kernel()) {
- memset((__force void*)mem, 0, len);
- return 0;
- }
-
return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
}
EXPORT_SYMBOL(__clear_user);
if (!access_ok(str, 1))
return -EFAULT;
-
- if (uaccess_kernel())
- return strnlen((__force char*)str, len) + 1;
-
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
if (n == 0)
return count + 1;