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Filename : sysc_ioprio_get.stp
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# ioprio_get _________________________________________________
# long sys_ioprio_get(int which, int who)
#

@define _SYSCALL_IOPRIO_GET_NAME
%(
	name = "ioprio_get"
%)

@define _SYSCALL_IOPRIO_GET_ARGSTR
%(
	argstr = sprintf("%s, %d", which_str, who)
%)

@define _SYSCALL_IOPRIO_GET_REGARGS
%(
	which = int_arg(1)
	which_str = _stp_ioprio_which_str(which)
	who = int_arg(2)
%)

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

# dw_ioprio_get _____________________________________________________

probe dw_syscall.ioprio_get = kernel.function("sys_ioprio_get").call ?
{
	@_SYSCALL_IOPRIO_GET_NAME
	which = __int32($which)
	which_str = _stp_ioprio_which_str(__int32($which))
	who = __int32($who)
	@_SYSCALL_IOPRIO_GET_ARGSTR
}
probe dw_syscall.ioprio_get.return = kernel.function("sys_ioprio_get").return ?
{
	@_SYSCALL_IOPRIO_GET_NAME
	@SYSC_RETVALSTR($return)
}

# nd_ioprio_get _____________________________________________________

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

probe nd1_syscall.ioprio_get = kprobe.function("sys_ioprio_get") ?
{
	@_SYSCALL_IOPRIO_GET_NAME
	asmlinkage()
	@_SYSCALL_IOPRIO_GET_REGARGS
	@_SYSCALL_IOPRIO_GET_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.ioprio_get = kprobe.function(@arch_syscall_prefix "sys_ioprio_get") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_IOPRIO_GET_NAME
	@_SYSCALL_IOPRIO_GET_REGARGS
	@_SYSCALL_IOPRIO_GET_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ioprio_get = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ioprio_get"), @const("__NR_compat_ioprio_get"))
	@_SYSCALL_IOPRIO_GET_NAME
	@_SYSCALL_IOPRIO_GET_REGARGS
	@_SYSCALL_IOPRIO_GET_ARGSTR
}

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

probe nd1_syscall.ioprio_get.return = kprobe.function("sys_ioprio_get").return ?
{
	@_SYSCALL_IOPRIO_GET_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.ioprio_get.return = kprobe.function(@arch_syscall_prefix "sys_ioprio_get").return ?
{
	@_SYSCALL_IOPRIO_GET_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ioprio_get.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ioprio_get"), @const("__NR_compat_ioprio_get"))
	@_SYSCALL_IOPRIO_GET_NAME
	@SYSC_RETVALSTR($ret)
}