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# bdflush ____________________________________________________
# long sys_bdflush(int func, long data)

@define _SYSCALL_BDFLUSH_NAME
%(
	name = "bdflush"
%)

@define _SYSCALL_BDFLUSH_ARGSTR
%(
	argstr = sprintf("%d, %s", func, data_str)
%)

@define _SYSCALL_BDFLUSH_REGARGS
%(
	func = int_arg(1)
	data = long_arg(2)
%)

@define _SYSCALL_BDFLUSH_REGARGS_STORE
%(
        if (@probewrite(func))
          set_int_arg(1, func)

	if (@probewrite(data))
	  set_long_arg(2, data)
%)

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

# dw_bdflush _____________________________________________________

probe dw_syscall.bdflush = kernel.function("sys_bdflush").call ?
{
	@_SYSCALL_BDFLUSH_NAME
	func = $func
	data = $data
	if (($func >= 2) && ($func % 2 == 0))
		data_str = sprintf("%p", $data)
	else
		data_str = sprintf("%d", $data)
	@_SYSCALL_BDFLUSH_ARGSTR
}
probe dw_syscall.bdflush.return = kernel.function("sys_bdflush").return ?
{
	@_SYSCALL_BDFLUSH_NAME
	@SYSC_RETVALSTR($return)
}

# nd_bdflush _____________________________________________________


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

probe nd1_syscall.bdflush = kprobe.function("sys_bdflush") ?
{
	@_SYSCALL_BDFLUSH_NAME
	asmlinkage()
	@_SYSCALL_BDFLUSH_REGARGS
	if ((func >= 2) && (func % 2 == 0))
		data_str = sprintf("%p", data)
	else
		data_str = sprintf("%d", data)
	@_SYSCALL_BDFLUSH_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.bdflush = kprobe.function(@arch_syscall_prefix "sys_bdflush") ?
{
	@_SYSCALL_BDFLUSH_NAME
	asmlinkage()
	@_SYSCALL_BDFLUSH_REGARGS
	if ((func >= 2) && (func % 2 == 0))
		data_str = sprintf("%p", data)
	else
		data_str = sprintf("%d", data)
	@_SYSCALL_BDFLUSH_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_BDFLUSH_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.bdflush = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_bdflush"), @const("__NR_compat_bdflush"))
	@_SYSCALL_BDFLUSH_NAME
	@_SYSCALL_BDFLUSH_REGARGS
	if ((func >= 2) && (func % 2 == 0))
		data_str = sprintf("%p", data)
	else
		data_str = sprintf("%d", data)
	@_SYSCALL_BDFLUSH_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_BDFLUSH_REGARGS_STORE %)
}

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

probe nd1_syscall.bdflush.return = kprobe.function("sys_bdflush").return ?
{
	@_SYSCALL_BDFLUSH_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.bdflush.return = kprobe.function(@arch_syscall_prefix "sys_bdflush").return ?
{
	@_SYSCALL_BDFLUSH_NAME
	@SYSC_RETVALSTR(returnval())
}

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