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Filename : sysc_ustat.stp
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# ustat ______________________________________________________
# long sys_ustat(unsigned dev, struct ustat __user * ubuf)
#

@define _SYSCALL_USTAT_NAME
%(
	name = "ustat"
%)

@define _SYSCALL_USTAT_ARGSTR
%(
	argstr = sprintf("%u, %p", dev, ubuf_uaddr)
%)

@define _SYSCALL_USTAT_REGARGS
%(
	dev = uint_arg(1)
	ubuf_uaddr = pointer_arg(2)
%)

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

# dw_ustat _____________________________________________________

probe dw_syscall.ustat = kernel.function("sys_ustat").call
{
	@_SYSCALL_USTAT_NAME
	dev = __uint32($dev)
	ubuf_uaddr = $ubuf
	@_SYSCALL_USTAT_ARGSTR
}
probe dw_syscall.ustat.return = kernel.function("sys_ustat").return ?
{
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_ustat _____________________________________________________

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

probe nd1_syscall.ustat = kprobe.function("sys_ustat") ?
{
	@_SYSCALL_USTAT_NAME
	asmlinkage()
	@_SYSCALL_USTAT_REGARGS
	@_SYSCALL_USTAT_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.ustat = kprobe.function(@arch_syscall_prefix "sys_ustat") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_USTAT_NAME
	@_SYSCALL_USTAT_REGARGS
	@_SYSCALL_USTAT_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ustat = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_ustat"))
	@_SYSCALL_USTAT_NAME
	@_SYSCALL_USTAT_REGARGS
	@_SYSCALL_USTAT_ARGSTR
}

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

probe nd1_syscall.ustat.return = kprobe.function("sys_ustat").return ?
{
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.ustat.return = kprobe.function(@arch_syscall_prefix "sys_ustat").return ?
{
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ustat.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_ustat"))
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR($ret)
}

# long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
# long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
#

probe syscall.ustat32 = dw_syscall.ustat32 !, nd_syscall.ustat32 ? {}
probe syscall.ustat32.return = dw_syscall.ustat32.return !,
                               nd_syscall.ustat32.return ? {}

# dw_ustat32 _____________________________________________________

probe dw_syscall.ustat32 = kernel.function("compat_sys_ustat").call ?,
      		        kernel.function("sys32_ustat").call ?
{
	@_SYSCALL_USTAT_NAME
	dev = __uint32($dev)
	ubuf_uaddr = @choose_defined($u, $u32p)
	@_SYSCALL_USTAT_ARGSTR
}


probe dw_syscall.ustat32.return = kernel.function("sys32_ustat").return ?,
                               kernel.function("compat_sys_ustat").return ?
{
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_ustat32 _____________________________________________________

probe nd_syscall.ustat32 = nd1_syscall.ustat32!, nd2_syscall.ustat32!, tp_syscall.ustat32
  { }

probe nd1_syscall.ustat32 = __nd1_syscall.ustat32 ?, __nd1_syscall.compat_ustat ?
{
	@_SYSCALL_USTAT_NAME
	@_SYSCALL_USTAT_ARGSTR
}
probe __nd1_syscall.ustat32 = kprobe.function("sys32_ustat") ?
{
	@_SYSCALL_USTAT_REGARGS
}
probe __nd1_syscall.compat_ustat = kprobe.function("compat_sys_ustat") ?
{
	asmlinkage()
	@_SYSCALL_USTAT_REGARGS
}

/* kernel 4.17+ */
probe nd2_syscall.ustat32 =
	kprobe.function(@arch_syscall_prefix "compat_sys_ustat") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_USTAT_NAME
	@_SYSCALL_USTAT_REGARGS
	@_SYSCALL_USTAT_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ustat32 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_ustat"))
	@_SYSCALL_USTAT_NAME
	@_SYSCALL_USTAT_REGARGS
	@_SYSCALL_USTAT_ARGSTR
}

probe nd_syscall.ustat32.return = nd1_syscall.ustat32.return!, nd2_syscall.ustat32.return!, tp_syscall.ustat32.return
  { }

probe nd1_syscall.ustat32.return = kprobe.function("sys32_ustat").return ?,
                                   kprobe.function("compat_sys_ustat").return ?
{
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.ustat32.return =
	kprobe.function(@arch_syscall_prefix "compat_sys_ustat").return ?
{
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ustat32.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_ustat"))
	@_SYSCALL_USTAT_NAME
	@SYSC_RETVALSTR($ret)
}