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

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
...@@ -318,5 +318,51 @@ static inline int user_regset_copyin_ignore(unsigned int *pos, ...@@ -318,5 +318,51 @@ static inline int user_regset_copyin_ignore(unsigned int *pos,
return 0; 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> */ #endif /* <linux/regset.h> */
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