user_regset_writeback_fn —
type of writeback function in struct user_regset
typedef int user_regset_writeback_fn ( | struct task_struct * target, |
| const struct user_regset * regset, | |
int immediate); |
targetthread being examined
regsetregset being examined
immediatezero if writeback at completion of next context switch is OK
This call is optional; usually the pointer is NULL. When
provided, there is some user memory associated with this regset's
hardware, such as memory backing cached register data on register
window machines; the regset's data controls what user memory is
used (e.g. via the stack pointer value).
Write register data back to user memory. If the immediate flag
is nonzero, it must be written to the user memory so uaccess or
access_process_vm can see it when this call returns; if zero,
then it must be written back by the time the task completes a
context switch (as synchronized with wait_task_inactive).
Return 0 on success or if there was nothing to do, -EFAULT for
a memory problem (bad stack pointer or whatever), or -EIO for a
hardware problem.