suse man page for user_regset_set_fn

USER_REGSET_SET_FN(9)						   Machine State					     USER_REGSET_SET_FN(9)

NAME
       user_regset_set_fn - type of set function in struct user_regset

SYNOPSIS
       typedef int user_regset_set_fn(struct task_struct * target, const struct user_regset * regset, unsigned int pos, unsigned int count,
				      const void * kbuf, const void __user * ubuf);

ARGUMENTS
       target
	   thread being examined

       regset
	   regset being examined

       pos
	   offset into the regset data to access, in bytes

       count
	   amount of data to copy, in bytes

       kbuf
	   if not NULL, a kernel-space pointer to copy from

       ubuf
	   if kbuf is NULL, a user-space pointer to copy from

DESCRIPTION
       Store register values. Return 0 on success; -EIO or -ENODEV are usual failure returns. The pos and count values are in bytes, but must be
       properly aligned. If kbuf is non-null, that buffer is used and ubuf is ignored. If kbuf is NULL, then ubuf gives a userland pointer to
       access directly, and an -EFAULT return value is possible.

Kernel Hackers Manual 2.6.					     July 2010						     USER_REGSET_SET_FN(9)