diff options
| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:31:47 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:31:47 +0100 |
| commit | 5bde4d181793be84351bc21c256d8c71cfcd313a (patch) | |
| tree | 58c1c534ef5af5f425de61532b8aa5d24048136f /include/linux | |
| parent | b9d36d5d000294a128f7f174fe67623a10e29d61 (diff) | |
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: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/regset.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/regset.h b/include/linux/regset.h index 761c931af97..8abee655622 100644 --- a/include/linux/regset.h +++ b/include/linux/regset.h @@ -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> */ |