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# openat _______________________________________________________
# long sys_openat(int dfd, const char __user *filename, int flags, int mode)
# long compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
#

@define _SYSCALL_OPENAT_NAME
%(
	name = "openat"
%)

@define _SYSCALL_OPENAT_ARGSTR
%(
	if (flags & @const("O_CREAT"))
		argstr = sprintf("%s, %s, %s, %#o", dfd_str, filename, flags_str, mode)
	else
		argstr = sprintf("%s, %s, %s", dfd_str, filename, flags_str)
%)

@define _SYSCALL_OPENAT_REGARGS
%(
	dfd = int_arg(1)
	dfd_str = _dfd_str(dfd)
	filename = user_string_quoted(pointer_arg(2))
	filename_unquoted = user_string_nofault(pointer_arg(2))
	flags = int_arg(3)
	flags_str = _sys_open_flag_str(flags)
	mode = uint_arg(4)
%)

@define _SYSCALL_OPENAT_REGARGS_STORE
%(
        if (@probewrite(dfd))
          set_int_arg(1, dfd)

	if (@probewrite(filename_unquoted))
	  set_user_string_arg(pointer_arg(2), filename_unquoted)

	if (@probewrite(flags))
	  set_int_arg(3, flags)

	if (@probewrite(mode))
	  set_uint_arg(4, mode)
%)

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

# dw_openat _____________________________________________________

probe dw_syscall.openat = kernel.function("compat_sys_openat").call ?,
                       kernel.function("sys_openat").call ?
{
	@_SYSCALL_OPENAT_NAME
	dfd = __int32($dfd)
	dfd_str = _dfd_str(__int32($dfd))
	filename = user_string_quoted(@__pointer($filename))
	flags = $flags
	flags_str = _sys_open_flag_str(flags)
	mode = __uint32($mode)
	@_SYSCALL_OPENAT_ARGSTR
}
probe dw_syscall.openat.return = kernel.function("compat_sys_openat").return ?,
                              kernel.function("sys_openat").return ?
{
	@_SYSCALL_OPENAT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_openat _____________________________________________________

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

probe nd1_syscall.openat = kprobe.function("compat_sys_openat") ?,
                           kprobe.function("sys_openat") ?
{
	@_SYSCALL_OPENAT_NAME
	asmlinkage()
	@_SYSCALL_OPENAT_REGARGS
	@_SYSCALL_OPENAT_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.openat = kprobe.function(@arch_syscall_prefix "compat_sys_openat") ?,
                           kprobe.function(@arch_syscall_prefix "sys_openat") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_OPENAT_NAME
	@_SYSCALL_OPENAT_REGARGS
	@_SYSCALL_OPENAT_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_OPENAT_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.openat = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_openat"), @const("__NR_compat_openat"))
	@_SYSCALL_OPENAT_NAME
	@_SYSCALL_OPENAT_REGARGS
	@_SYSCALL_OPENAT_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_OPENAT_REGARGS_STORE %)
}

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

probe nd1_syscall.openat.return = kprobe.function("compat_sys_openat").return ?,
                                  kprobe.function("sys_openat").return ?
{
	@_SYSCALL_OPENAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.openat.return = kprobe.function(@arch_syscall_prefix "compat_sys_openat").return ?,
                                  kprobe.function(@arch_syscall_prefix "sys_openat").return ?
{
	@_SYSCALL_OPENAT_NAME
	@SYSC_RETVALSTR(returnval())
}

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