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Filename : sysc_timer_delete.stp
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# timer_delete _______________________________________________
#
# long sys_timer_delete(timer_t timer_id)
#

@define _SYSCALL_TIMER_DELETE_NAME
%(
	name = "timer_delete"
%)

@define _SYSCALL_TIMER_DELETE_ARGSTR
%(
	argstr = sprint(timerid)
%)

@define _SYSCALL_TIMER_DELETE_REGARGS
%(
	timerid = int_arg(1)
%)

probe syscall.timer_delete = dw_syscall.timer_delete !, nd_syscall.timer_delete ? {}
probe syscall.timer_delete.return = dw_syscall.timer_delete.return !,
                                    nd_syscall.timer_delete.return ? {}

# dw_timer_delete _____________________________________________________

probe dw_syscall.timer_delete = kernel.function("sys_timer_delete").call
{
	@_SYSCALL_TIMER_DELETE_NAME
	timerid = __int32($timer_id)
	@_SYSCALL_TIMER_DELETE_ARGSTR
}
probe dw_syscall.timer_delete.return = kernel.function("sys_timer_delete").return
{
	@_SYSCALL_TIMER_DELETE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_timer_delete _____________________________________________________

probe nd_syscall.timer_delete = nd1_syscall.timer_delete!, nd2_syscall.timer_delete!, tp_syscall.timer_delete
  { }

probe nd1_syscall.timer_delete = kprobe.function("sys_timer_delete") ?
{
	@_SYSCALL_TIMER_DELETE_NAME
	asmlinkage()
	@_SYSCALL_TIMER_DELETE_REGARGS
	@_SYSCALL_TIMER_DELETE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.timer_delete = kprobe.function(@arch_syscall_prefix "sys_timer_delete") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIMER_DELETE_NAME
	@_SYSCALL_TIMER_DELETE_REGARGS
	@_SYSCALL_TIMER_DELETE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.timer_delete = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_timer_delete"), @const("__NR_compat_timer_delete"))
	@_SYSCALL_TIMER_DELETE_NAME
	@_SYSCALL_TIMER_DELETE_REGARGS
	@_SYSCALL_TIMER_DELETE_ARGSTR
}

probe nd_syscall.timer_delete.return = nd1_syscall.timer_delete.return!, nd2_syscall.timer_delete.return!, tp_syscall.timer_delete.return
  { }

probe nd1_syscall.timer_delete.return = kprobe.function("sys_timer_delete").return ?
{
	@_SYSCALL_TIMER_DELETE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.timer_delete.return = kprobe.function(@arch_syscall_prefix "sys_timer_delete").return ?
{
	@_SYSCALL_TIMER_DELETE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.timer_delete.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_timer_delete"), @const("__NR_compat_timer_delete"))
	@_SYSCALL_TIMER_DELETE_NAME
	@SYSC_RETVALSTR($ret)
}