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)
Check Out this Related Man Page
TASK_CURRENT_SYSCALL(9) Machine State TASK_CURRENT_SYSCALL(9)NAME
task_current_syscall - Discover what a blocked task is doing.
SYNOPSIS
int task_current_syscall(struct task_struct * target, long * callno, unsigned long args[6], unsigned int maxargs, unsigned long * sp,
unsigned long * pc);
ARGUMENTS
target
thread to examine
callno
filled with system call number or -1
args[6]
filled with maxargs system call arguments
maxargs
number of elements in args to fill
sp
filled with user stack pointer
pc
filled with user PC
DESCRIPTION
If target is blocked in a system call, returns zero with *callno set to the the call's number and args filled in with its arguments.
Registers not used for system call arguments may not be available and it is not kosher to use struct user_regset calls while the system
call is still in progress. Note we may get this result if target has finished its system call but not yet returned to user mode, such as
when it's stopped for signal handling or syscall exit tracing.
If target is blocked in the kernel during a fault or exception, returns zero with *callno set to -1 and does not fill in args. If so, it's
now safe to examine target using struct user_regset get calls as long as we're sure target won't return to user mode.
Returns -EAGAIN if target does not remain blocked.
Returns -EINVAL if maxargs is too large (maximum is six).
Kernel Hackers Manual 2.6. July 2010 TASK_CURRENT_SYSCALL(9)
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