#include <linux/compiler.h>
#include <linux/types.h>
+#include <linux/uaccess.h>
struct task_struct;
struct user_regset;
const struct user_regset_view *task_user_regset_view(struct task_struct *tsk);
+/*
+ * These are helpers for writing regset get/set functions in arch code.
+ * Because @start_pos and @end_pos are always compile-time constants,
+ * these are inlined into very little code though they look large.
+ *
+ * Use one or more calls sequentially for each chunk of regset data stored
+ * contiguously in memory. Call with constants for @start_pos and @end_pos,
+ * giving the range of byte positions in the regset that data corresponds
+ * to; @end_pos can be -1 if this chunk is at the end of the regset layout.
+ * Each call updates the arguments to point past its chunk.
+ */
+
+static inline int user_regset_copyout(unsigned int *pos, unsigned int *count,
+ void **kbuf,
+ void __user **ubuf, const void *data,
+ const int start_pos, const int end_pos)
+{
+ if (*count == 0)
+ return 0;
+ BUG_ON(*pos < start_pos);
+ if (end_pos < 0 || *pos < end_pos) {
+ unsigned int copy = (end_pos < 0 ? *count
+ : min(*count, end_pos - *pos));
+ data += *pos - start_pos;
+ if (*kbuf) {
+ memcpy(*kbuf, data, copy);
+ *kbuf += copy;
+ } else if (__copy_to_user(*ubuf, data, copy))
+ return -EFAULT;
+ else
+ *ubuf += copy;
+ *pos += copy;
+ *count -= copy;
+ }
+ return 0;
+}
+
+static inline int user_regset_copyin(unsigned int *pos, unsigned int *count,
+ const void **kbuf,
+ const void __user **ubuf, void *data,
+ const int start_pos, const int end_pos)
+{
+ if (*count == 0)
+ return 0;
+ BUG_ON(*pos < start_pos);
+ if (end_pos < 0 || *pos < end_pos) {
+ unsigned int copy = (end_pos < 0 ? *count
+ : min(*count, end_pos - *pos));
+ data += *pos - start_pos;
+ if (*kbuf) {
+ memcpy(data, *kbuf, copy);
+ *kbuf += copy;
+ } else if (__copy_from_user(data, *ubuf, copy))
+ return -EFAULT;
+ else
+ *ubuf += copy;
+ *pos += copy;
+ *count -= copy;
+ }
+ return 0;
+}
+
+/*
+ * These two parallel the two above, but for portions of a regset layout
+ * that always read as all-zero or for which writes are ignored.
+ */
+static inline int user_regset_copyout_zero(unsigned int *pos,
+ unsigned int *count,
+ void **kbuf, void __user **ubuf,
+ const int start_pos,
+ const int end_pos)
+{
+ if (*count == 0)
+ return 0;
+ BUG_ON(*pos < start_pos);
+ if (end_pos < 0 || *pos < end_pos) {
+ unsigned int copy = (end_pos < 0 ? *count
+ : min(*count, end_pos - *pos));
+ if (*kbuf) {
+ memset(*kbuf, 0, copy);
+ *kbuf += copy;
+ } else if (__clear_user(*ubuf, copy))
+ return -EFAULT;
+ else
+ *ubuf += copy;
+ *pos += copy;
+ *count -= copy;
+ }
+ return 0;
+}
+
+static inline int user_regset_copyin_ignore(unsigned int *pos,
+ unsigned int *count,
+ const void **kbuf,
+ const void __user **ubuf,
+ const int start_pos,
+ const int end_pos)
+{
+ if (*count == 0)
+ return 0;
+ BUG_ON(*pos < start_pos);
+ if (end_pos < 0 || *pos < end_pos) {
+ unsigned int copy = (end_pos < 0 ? *count
+ : min(*count, end_pos - *pos));
+ if (*kbuf)
+ *kbuf += copy;
+ else
+ *ubuf += copy;
+ *pos += copy;
+ *count -= copy;
+ }
+ return 0;
+}
+
+/**
+ * copy_regset_to_user - fetch a thread's user_regset data into user memory
+ * @target: thread to be examined
+ * @view: &struct user_regset_view describing user thread machine state
+ * @setno: index in @view->regsets
+ * @offset: offset into the regset data, in bytes
+ * @size: amount of data to copy, in bytes
+ * @data: user-mode pointer to copy into
+ */
+static inline int copy_regset_to_user(struct task_struct *target,
+ const struct user_regset_view *view,
+ unsigned int setno,
+ unsigned int offset, unsigned int size,
+ void __user *data)
+{
+ const struct user_regset *regset = &view->regsets[setno];
+
+ if (!access_ok(VERIFY_WRITE, data, size))
+ return -EIO;
+
+ return regset->get(target, regset, offset, size, NULL, data);
+}
+
+/**
+ * copy_regset_from_user - store into thread's user_regset data from user memory
+ * @target: thread to be examined
+ * @view: &struct user_regset_view describing user thread machine state
+ * @setno: index in @view->regsets
+ * @offset: offset into the regset data, in bytes
+ * @size: amount of data to copy, in bytes
+ * @data: user-mode pointer to copy from
+ */
+static inline int copy_regset_from_user(struct task_struct *target,
+ const struct user_regset_view *view,
+ unsigned int setno,
+ unsigned int offset, unsigned int size,
+ const void __user *data)
+{
+ const struct user_regset *regset = &view->regsets[setno];
+
+ if (!access_ok(VERIFY_READ, data, size))
+ return -EIO;
+
+ return regset->set(target, regset, offset, size, NULL, data);
+}
+
+
#endif /* <linux/regset.h> */
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