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Filename : sysc_timer_create.stp
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# timer_create _______________________________________________
#
# long sys_timer_create(clockid_t which_clock,
#			struct sigevent __user *timer_event_spec,
#			timer_t __user * created_timer_id)
# long compat_sys_timer_create(clockid_t which_clock,
#			struct sigevent __user *timer_event_spec,
#			timer_t __user * created_timer_id)
#

@define _SYSCALL_TIMER_CREATE_NAME
%(
	name = "timer_create"
%)

@define _SYSCALL_TIMER_CREATE_ARGSTR
%(
	argstr = sprintf("%s, %p, %p", clockid_str, evp_uaddr, timerid_uaddr)
%)

@define _SYSCALL_TIMER_CREATE_REGARGS
%(
	clockid = int_arg(1)
	clockid_str = _get_wc_str(clockid)
	evp_uaddr = pointer_arg(2)
	timerid_uaddr = pointer_arg(3)
%)

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

# dw_timer_create _____________________________________________________

probe dw_syscall.timer_create = __syscall.timer_create,
                             kernel.function("compat_sys_timer_create").call ?
{
	@_SYSCALL_TIMER_CREATE_NAME
	clockid = __int32($which_clock)
	clockid_str = _get_wc_str(__int32($which_clock))
	evp_uaddr = @__pointer($timer_event_spec)
	timerid_uaddr = @__pointer($created_timer_id)
	@_SYSCALL_TIMER_CREATE_ARGSTR
}
probe __syscall.timer_create = kernel.function("sys_timer_create").call
{
	@__syscall_gate(@const("__NR_timer_create"))
}
probe dw_syscall.timer_create.return =
	__syscall.timer_create.return,
	kernel.function("compat_sys_timer_create").return ?
{
	@_SYSCALL_TIMER_CREATE_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.timer_create.return = kernel.function("sys_timer_create").return
{
	@__syscall_gate(@const("__NR_timer_create"))
}

# nd_timer_create _____________________________________________________

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

probe nd1_syscall.timer_create = __nd1_syscall.timer_create,
                                 __nd1_syscall.compat_timer_create ?
{
	@_SYSCALL_TIMER_CREATE_NAME
}
probe __nd1_syscall.timer_create = kprobe.function("sys_timer_create")
{
	@__syscall_gate(@const("__NR_timer_create"))
	asmlinkage()
	@_SYSCALL_TIMER_CREATE_REGARGS
	@_SYSCALL_TIMER_CREATE_ARGSTR
}
probe __nd1_syscall.compat_timer_create = kprobe.function("compat_sys_timer_create") ?
{
	asmlinkage()
	@_SYSCALL_TIMER_CREATE_REGARGS
	@_SYSCALL_TIMER_CREATE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.timer_create = __nd2_syscall.timer_create,
                                 __nd2_syscall.compat_timer_create ?
{
	@_SYSCALL_TIMER_CREATE_NAME
}
probe __nd2_syscall.timer_create =
	kprobe.function(@arch_syscall_prefix "sys_timer_create") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIMER_CREATE_REGARGS
	@_SYSCALL_TIMER_CREATE_ARGSTR
}
probe __nd2_syscall.compat_timer_create =
	kprobe.function(@arch_syscall_prefix "compat_sys_timer_create") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIMER_CREATE_REGARGS
	@_SYSCALL_TIMER_CREATE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.timer_create = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_timer_create"), @const("__NR_compat_timer_create"))
	@_SYSCALL_TIMER_CREATE_NAME
	@_SYSCALL_TIMER_CREATE_REGARGS
	@_SYSCALL_TIMER_CREATE_ARGSTR
}

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

probe nd1_syscall.timer_create.return =
	__nd1_syscall.timer_create.return,
	kprobe.function("compat_sys_timer_create").return ?
{
	@_SYSCALL_TIMER_CREATE_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.timer_create.return = kprobe.function("sys_timer_create").return
{
	@__syscall_gate(@const("__NR_timer_create"))
}

/* kernel 4.17+ */
probe nd2_syscall.timer_create.return =
	kprobe.function(@arch_syscall_prefix "sys_timer_create").return,
	kprobe.function(@arch_syscall_prefix "compat_sys_timer_create").return ?
{
	@_SYSCALL_TIMER_CREATE_NAME
	@SYSC_RETVALSTR(returnval())
}

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