1#@!#!123s

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Filename : sysc_io_setup.stp
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# io_setup ___________________________________________________
# long sys_io_setup(unsigned nr_events, aio_context_t __user *ctxp)
# long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
#

@define _SYSCALL_IO_SETUP_NAME
%(
	name = "io_setup"
%)

@define _SYSCALL_IO_SETUP_ARGSTR
%(
	argstr = sprintf("%u, %p", maxevents, ctxp_uaddr)
%)

@define _SYSCALL_IO_SETUP_REGARGS
%(
	maxevents = uint_arg(1)
	ctxp_uaddr = pointer_arg(2)
%)

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

# dw_io_setup _____________________________________________________

probe dw_syscall.io_setup = __syscall.io_setup,
	__syscall.compat_io_setup ?
{
	@_SYSCALL_IO_SETUP_NAME

}
probe __syscall.io_setup = kernel.function("sys_io_setup").call
{
	@__syscall_gate(@const("__NR_io_setup"))
	maxevents = __uint32($nr_events)
	ctxp_uaddr = $ctxp
	@_SYSCALL_IO_SETUP_ARGSTR
}
probe __syscall.compat_io_setup = kernel.function("compat_sys_io_setup").call
{
	maxevents = __uint32(@choose_defined($nr_reqs,$nr_events))
	ctxp_uaddr = $ctx32p
	@_SYSCALL_IO_SETUP_ARGSTR
}
probe dw_syscall.io_setup.return = __syscall.io_setup.return,
	kernel.function("compat_sys_io_setup").return ?
{
	@_SYSCALL_IO_SETUP_NAME
	@SYSC_RETVALSTR($return)
}

probe __syscall.io_setup.return = kernel.function("sys_io_setup").return
{
	@__syscall_gate(@const("__NR_io_setup"))
}

# nd_io_setup _____________________________________________________

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

probe nd1_syscall.io_setup = __nd1_syscall.io_setup,
	kprobe.function("compat_sys_io_setup") ?
{
	asmlinkage()
	@_SYSCALL_IO_SETUP_NAME
	@_SYSCALL_IO_SETUP_REGARGS
	@_SYSCALL_IO_SETUP_ARGSTR
}
probe __nd1_syscall.io_setup = kprobe.function("sys_io_setup") ?
{
	@__syscall_gate(@const("__NR_io_setup"))
}

/* kernel 4.17+ */
probe nd2_syscall.io_setup = kprobe.function(@arch_syscall_prefix "sys_io_setup") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_io_setup") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_IO_SETUP_NAME
	@_SYSCALL_IO_SETUP_REGARGS
	@_SYSCALL_IO_SETUP_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.io_setup = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_io_setup"), @const("__NR_compat_io_setup"))
	@_SYSCALL_IO_SETUP_NAME
	@_SYSCALL_IO_SETUP_REGARGS
	@_SYSCALL_IO_SETUP_ARGSTR
}

probe nd_syscall.io_setup.return = nd1_syscall.io_setup.return!, nd2_syscall.io_setup.return!, tp_syscall.io_setup.return
  { }
  
probe nd1_syscall.io_setup.return = __nd1_syscall.io_setup.return,
	kprobe.function("compat_sys_io_setup").return ?
{
	@_SYSCALL_IO_SETUP_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.io_setup.return = kprobe.function("sys_io_setup").return ?
{
	@__syscall_gate(@const("__NR_io_setup"))
}

/* kernel 4.17+ */
probe nd2_syscall.io_setup.return = kprobe.function(@arch_syscall_prefix "sys_io_setup").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_io_setup").return ?
{
	@_SYSCALL_IO_SETUP_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.io_setup.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_io_setup"), @const("__NR_compat_io_setup"))
	@_SYSCALL_IO_SETUP_NAME
	@SYSC_RETVALSTR($ret)
}