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: / usr / share / systemtap / tapset / linux /
Filename : sysc_timerfd_settime.stp
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# timerfd_settime ____________________________________________
#
# SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
#		const struct itimerspec __user *, utmr,
#		struct itimerspec __user *, otmr)
# COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
#		const struct compat_itimerspec __user *, utmr,
#		struct compat_itimerspec __user *, otmr)

@define _SYSCALL_TIMERFD_SETTIME_NAME
%(
	name = "timerfd_settime"
%)

@define _SYSCALL_TIMERFD_SETTIME_ARGSTR
%(
	argstr = sprintf("%d, %s, %s, %p", fd, flags_str,
	                 value_str, ovalue_uaddr)
%)

@define _SYSCALL_TIMERFD_SETTIME_REGARGS
%(
	fd = int_arg(1)
	flags = int_arg(2)
	flags_str = _stp_timerfd_flags_str(flags)
	value_uaddr = pointer_arg(3)
%( 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)
%)
	ovalue_uaddr = pointer_arg(4)
%)

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

# dw_timerfd_settime _____________________________________________________

probe dw_syscall.timerfd_settime = __syscall.timerfd_settime ?,
	kernel.function("compat_sys_timerfd_settime").call ?
{
	@_SYSCALL_TIMERFD_SETTIME_NAME
	fd = __int32($ufd)
	flags = __int32($flags)
	flags_str = _stp_timerfd_flags_str(flags)
	value_uaddr = @__pointer($utmr)
	ovalue_uaddr = @__pointer($otmr)
%( 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_TIMERFD_SETTIME_ARGSTR
}
probe __syscall.timerfd_settime = kernel.function("sys_timerfd_settime").call ?
{
	@__syscall_gate_compat_simple
}
probe dw_syscall.timerfd_settime.return = __syscall.timerfd_settime.return ?,
	kernel.function("compat_sys_timerfd_settime").return ?
{
	@_SYSCALL_TIMERFD_SETTIME_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.timerfd_settime.return =
	kernel.function("sys_timerfd_settime").return ?
{
	@__syscall_gate_compat_simple
}

# nd_timerfd_settime _____________________________________________________

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

probe nd1_syscall.timerfd_settime = __nd1_syscall.timerfd_settime ?,
	__nd1_syscall.compat_timerfd_settime ?
{
	@_SYSCALL_TIMERFD_SETTIME_NAME
}
probe __nd1_syscall.timerfd_settime =
	kprobe.function("sys_timerfd_settime").call ?
{
	@__syscall_gate_compat_simple
	asmlinkage()
	@_SYSCALL_TIMERFD_SETTIME_REGARGS
	@_SYSCALL_TIMERFD_SETTIME_ARGSTR
}
probe __nd1_syscall.compat_timerfd_settime =
	kprobe.function("compat_sys_timerfd_settime").call ?
{
	asmlinkage()
	@_SYSCALL_TIMERFD_SETTIME_REGARGS
	@_SYSCALL_TIMERFD_SETTIME_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.timerfd_settime =
	kprobe.function(@arch_syscall_prefix "sys_timerfd_settime") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_timerfd_settime") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIMERFD_SETTIME_NAME
	@_SYSCALL_TIMERFD_SETTIME_REGARGS
	@_SYSCALL_TIMERFD_SETTIME_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.timerfd_settime = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_timerfd_settime"), @const("__NR_compat_timerfd_settime"))
	@_SYSCALL_TIMERFD_SETTIME_NAME
	@_SYSCALL_TIMERFD_SETTIME_REGARGS
	@_SYSCALL_TIMERFD_SETTIME_ARGSTR
}

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

probe nd1_syscall.timerfd_settime.return = __nd1_syscall.timerfd_settime.return ?,
	kprobe.function("compat_sys_timerfd_settime").return ?
{
	@_SYSCALL_TIMERFD_SETTIME_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.timerfd_settime.return =
	kprobe.function("sys_timerfd_settime").return ?
{
	@__syscall_gate_compat_simple
}

/* kernel 4.17+ */
probe nd2_syscall.timerfd_settime.return =
	kprobe.function(@arch_syscall_prefix "sys_timerfd_settime").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_timerfd_settime").return ?
{
	@_SYSCALL_TIMERFD_SETTIME_NAME
	@SYSC_RETVALSTR(returnval())
}

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