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Filename : sysc_clock_getres.stp
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# clock_getres _______________________________________________
# long sys_clock_getres(clockid_t which_clock, struct timespec __user *tp)
# long compat_clock_getres(clockid_t which_clock, struct compat_timespec __user *tp)
#

@define _SYSCALL_CLOCK_GETRES_NAME
%(
	name = "clock_getres"
%)

@define _SYSCALL_CLOCK_GETRES_ARGSTR
%(
	argstr = sprintf("%s, %p", clk_id_str, res_uaddr)
%)

@define _SYSCALL_CLOCK_GETRES_REGARGS
%(
	clk_id = int_arg(1)
	clk_id_str = _get_wc_str(clk_id)
	res_uaddr = pointer_arg(2)
%)

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

# dw_clock_getres _____________________________________________________

probe dw_syscall.clock_getres = kernel.function("compat_clock_getres").call ?,
	kernel.function("compat_sys_clock_getres").call ?,
	__syscall.clock_getres ?
{
	@_SYSCALL_CLOCK_GETRES_NAME
	clk_id = __int32($which_clock)
	clk_id_str = _get_wc_str(__int32($which_clock))
	res_uaddr = $tp
	@_SYSCALL_CLOCK_GETRES_ARGSTR
}
probe __syscall.clock_getres = kernel.function("sys_clock_getres").call
{
	@__syscall_gate(@const("__NR_clock_getres"))
}
probe dw_syscall.clock_getres.return =
	kernel.function("compat_clock_getres").return ?,
	kernel.function("compat_sys_clock_getres").return ?,
	__syscall.clock_getres.return ?
{
	@_SYSCALL_CLOCK_GETRES_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.clock_getres.return =
	kernel.function("sys_clock_getres").return
{
	@__syscall_gate(@const("__NR_clock_getres"))
}

# nd_clock_getres _____________________________________________________

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

probe nd1_syscall.clock_getres = kprobe.function("compat_clock_getres") ?,
	kprobe.function("compat_sys_clock_getres") ?,
	__nd1_syscall.clock_getres ?
{
	asmlinkage()
	@_SYSCALL_CLOCK_GETRES_NAME
	@_SYSCALL_CLOCK_GETRES_REGARGS
	@_SYSCALL_CLOCK_GETRES_ARGSTR
}
probe __nd1_syscall.clock_getres = kprobe.function("sys_clock_getres")
{
	@__syscall_gate(@const("__NR_clock_getres"))
}

/* kernel 4.17+ */
probe nd2_syscall.clock_getres = kprobe.function(@arch_syscall_prefix "compat_sys_clock_getres") ?,
	kprobe.function(@arch_syscall_prefix "sys_clock_getres") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_CLOCK_GETRES_NAME
	@_SYSCALL_CLOCK_GETRES_REGARGS
	@_SYSCALL_CLOCK_GETRES_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.clock_getres = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_clock_getres"), @const("__NR_compat_clock_getres"))
	@_SYSCALL_CLOCK_GETRES_NAME
	@_SYSCALL_CLOCK_GETRES_REGARGS
	@_SYSCALL_CLOCK_GETRES_ARGSTR
}

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

probe nd1_syscall.clock_getres.return =
	kprobe.function("compat_clock_getres").return ?,
	kprobe.function("compat_sys_clock_getres").return ?,
	__nd1_syscall.clock_getres.return ?
{
	@_SYSCALL_CLOCK_GETRES_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.clock_getres.return =
	kprobe.function("sys_clock_getres").return
{
	@__syscall_gate(@const("__NR_clock_getres"))
}

/* kernel 4.17+ */
probe nd2_syscall.clock_getres.return = 
	kprobe.function(@arch_syscall_prefix "compat_sys_clock_getres").return ?,
	kprobe.function(@arch_syscall_prefix "sys_clock_getres").return ?
{
	@_SYSCALL_CLOCK_GETRES_NAME
	@SYSC_RETVALSTR(returnval())
}

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