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Filename : sysc_sysfs.stp
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# sysfs ______________________________________________________
#
# asmlinkage long
# sys_sysfs(int option,
#	     unsigned long arg1,
#	     unsigned long arg2)
#

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

# dw_sysfs _____________________________________________________

probe dw_syscall.sysfs = kernel.function("sys_sysfs").call
{
	name = "sysfs"
	option = __int32($option)
	arg1 = $arg1
	arg2 = $arg2
	if (option == 1)
		argstr = sprintf("%d, %s", __int32($option),
				 user_string_quoted($arg1))
	else if (option == 2)
		argstr = sprintf("%d, %d, %p", __int32($option), $arg1, $arg2)
	else if (option == 3)
		argstr = sprintf("%d", __int32($option))
	else
		argstr = sprintf("%d, 0x%x, 0x%x", __int32($option), $arg1,
				 $arg2)
}
probe dw_syscall.sysfs.return = kernel.function("sys_sysfs").return
{
	name = "sysfs"
	@SYSC_RETVALSTR($return)
}

# nd_sysfs _____________________________________________________

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

probe nd1_syscall.sysfs = kprobe.function("sys_sysfs") ?
{
	name = "sysfs"
	asmlinkage()
	option = int_arg(1)
	arg1 = ulong_arg(2)
	arg2 = ulong_arg(3)
	if (option == 1)
		argstr = sprintf("%d, %s", option, user_string_quoted(arg1))
	else if (option == 2)
		argstr = sprintf("%d, %d, %p", option, arg1, arg2)
	else if (option == 3)
		argstr = sprintf("%d", option)
	else
		argstr = sprintf("%d, 0x%x, 0x%x", option, arg1, arg2)
}

/* kernel 4.17+ */
probe nd2_syscall.sysfs = kprobe.function(@arch_syscall_prefix "sys_sysfs") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	name = "sysfs"
	option = int_arg(1)
	arg1 = ulong_arg(2)
	arg2 = ulong_arg(3)
	if (option == 1)
		argstr = sprintf("%d, %s", option, user_string_quoted(arg1))
	else if (option == 2)
		argstr = sprintf("%d, %d, %p", option, arg1, arg2)
	else if (option == 3)
		argstr = sprintf("%d", option)
	else
		argstr = sprintf("%d, 0x%x, 0x%x", option, arg1, arg2)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sysfs = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_sysfs"), @const("__NR_compat_sysfs"))
	name = "sysfs"
	option = int_arg(1)
	arg1 = ulong_arg(2)
	arg2 = ulong_arg(3)
	if (option == 1)
		argstr = sprintf("%d, %s", option, user_string_quoted(arg1))
	else if (option == 2)
		argstr = sprintf("%d, %d, %p", option, arg1, arg2)
	else if (option == 3)
		argstr = sprintf("%d", option)
	else
		argstr = sprintf("%d, 0x%x, 0x%x", option, arg1, arg2)
}

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

probe nd1_syscall.sysfs.return = kprobe.function("sys_sysfs").return ?
{
	name = "sysfs"
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.sysfs.return = kprobe.function(@arch_syscall_prefix "sys_sysfs").return ?
{
	name = "sysfs"
	@SYSC_RETVALSTR(returnval())
}

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