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Commit 5bde4d18 authored by Roland McGrath's avatar Roland McGrath Committed by Ingo Molnar
Browse files

x86: user_regset user-copy helpers 



This defines two new inlines in linux/regset.h, for use in arch_ptrace
implementations and the like.  These provide simplified wrappers for using
the user_regset interfaces to copy thread regset data into the caller's
user-space memory.  The inlines are trivial, but make the common uses in
places such as ptrace implementation much more concise, easier to read, and
less prone to code-copying errors.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent b9d36d5d

include/linux/regset.h

+46 −0
Original line number Diff line number Diff line
@@ -318,5 +318,51 @@ static inline int user_regset_copyin_ignore(unsigned int *pos, 
	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> */