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Filename : sysc_timer_settime.stp
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# timer_settime ______________________________________________
#
# long sys_timer_settime(timer_t timer_id,
#			 int flags,
#			 const struct itimerspec __user *new_setting,
#			 struct itimerspec __user *old_setting)
# long compat_sys_timer_settime(timer_t timer_id, int flags,
#			  struct compat_itimerspec __user *new,
#			  struct compat_itimerspec __user *old)
#

@define _SYSCALL_TIMER_SETTIME_NAME
%(
	name = "timer_settime"
%)

@define _SYSCALL_TIMER_SETTIME_ARGSTR
%(
	argstr = sprintf("%d, %d, %s, %p", timerid, flags,
	                 value_str, ovalue_uaddr)
%)

@define _SYSCALL_TIMER_SETTIME_REGARGS
%(
	timerid = int_arg(1)
	flags = int_arg(2)
	value_uaddr  = pointer_arg(3)
	ovalue_uaddr = pointer_arg(4)
%)

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

# dw_timer_settime _____________________________________________________

probe dw_syscall.timer_settime = __syscall.timer_settime,
                              kernel.function("compat_sys_timer_settime").call ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
	timerid = __int32($timer_id)
	flags = __int32($flags)
	value_uaddr  = @__pointer(@choose_defined($new, $new_setting))
	ovalue_uaddr = @__pointer(@choose_defined($old, $old_setting))
%( CONFIG_COMPAT == "y" %?
	value_str = (@__compat_task ? _struct_compat_itimerspec_u(value_uaddr)
	             : _struct_itimerspec_u(value_uaddr))
%:
	value_str = _struct_itimerspec_u(value_uaddr)
%)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}
probe __syscall.timer_settime = kernel.function("sys_timer_settime").call
{
	@__syscall_gate(@const("__NR_timer_settime"))
}
probe dw_syscall.timer_settime.return =
	__syscall.timer_settime.return,
	kernel.function("compat_sys_timer_settime").return ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.timer_settime.return =
	kernel.function("sys_timer_settime").return
{
	@__syscall_gate(@const("__NR_timer_settime"))
}

# nd_timer_settime _____________________________________________________

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

probe nd1_syscall.timer_settime = __nd1_syscall.timer_settime,
				  __nd1_syscall.compat_timer_settime ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
	asmlinkage()
}
probe __nd1_syscall.timer_settime = kprobe.function("sys_timer_settime").call
{
	@__syscall_gate(@const("__NR_timer_settime"))
	asmlinkage()
	@_SYSCALL_TIMER_SETTIME_REGARGS
	value_str = _struct_itimerspec_u(value_uaddr)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}
probe __nd1_syscall.compat_timer_settime =
	kprobe.function("compat_sys_timer_settime").call ?
{
	asmlinkage()
	@_SYSCALL_TIMER_SETTIME_REGARGS
	value_str = _struct_compat_itimerspec_u(value_uaddr)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.timer_settime = __nd2_syscall.timer_settime,
				  __nd2_syscall.compat_timer_settime ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
}
probe __nd2_syscall.timer_settime =
	kprobe.function(@arch_syscall_prefix "sys_timer_settime")
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIMER_SETTIME_REGARGS
	value_str = _struct_itimerspec_u(value_uaddr)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}
probe __nd2_syscall.compat_timer_settime =
	kprobe.function(@arch_syscall_prefix "compat_sys_timer_settime").call ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIMER_SETTIME_REGARGS
	value_str = _struct_compat_itimerspec_u(value_uaddr)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.timer_settime = __tp_syscall.timer_settime,
                                 __tp_syscall.compat_timer_settime ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
}
probe __tp_syscall.timer_settime = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_timer_settime"))
	@_SYSCALL_TIMER_SETTIME_REGARGS
	value_str = _struct_itimerspec_u(value_uaddr)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}
probe __tp_syscall.compat_timer_settime = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_timer_settime"))
	@_SYSCALL_TIMER_SETTIME_REGARGS
	value_str = _struct_compat_itimerspec_u(value_uaddr)
	@_SYSCALL_TIMER_SETTIME_ARGSTR
}

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

probe nd1_syscall.timer_settime.return =
	__nd1_syscall.timer_settime.return,
	kprobe.function("compat_sys_timer_settime").return ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.timer_settime.return =
	kprobe.function("sys_timer_settime").return
{
	@__syscall_gate(@const("__NR_timer_settime"))
}

/* kernel 4.17+ */
probe nd2_syscall.timer_settime.return =
	kprobe.function(@arch_syscall_prefix "sys_timer_settime").return,
	kprobe.function(@arch_syscall_prefix "compat_sys_timer_settime").return ?
{
	@_SYSCALL_TIMER_SETTIME_NAME
	@SYSC_RETVALSTR(returnval())
}

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