USER_REGSET_WRITEBAC(9) Machine State USER_REGSET_WRITEBAC(9)
NAME
user_regset_writeback_fn - type of writeback function in struct user_regset
SYNOPSIS
typedef int user_regset_writeback_fn(struct task_struct * target, const struct user_regset * regset, int immediate);
ARGUMENTS
target
thread being examined
regset
regset being examined
immediate
zero if writeback at completion of next context switch is OK
DESCRIPTION
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.
Kernel Hackers Manual 2.6. July 2010 USER_REGSET_WRITEBAC(9)
