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Dir : ~/usr/share/systemtap/tapset/linux/

View File Name : sysc_ssetmask.stp

# ssetmask ___________________________________________________
#
# long sys_ssetmask(int newmask)
#

@define _SYSCALL_SSETMASK_NAME
%(
	name = "ssetmask"
%)

@define _SYSCALL_SSETMASK_ARGSTR
%(
	argstr = _stp_sigmask_str(newmask)
%)

@define _SYSCALL_SSETMASK_REGARGS
%(
	newmask = int_arg(1)
	newmask_str = _stp_sigmask_str(newmask)
%)

@define _SYSCALL_SSETMASK_REGARGS_STORE
%(
        if (@probewrite(newmask))
          set_int_arg(1, newmask)
%)

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

# dw_ssetmask _____________________________________________________

probe dw_syscall.ssetmask = kernel.function("sys_ssetmask").call ?
{
	@_SYSCALL_SSETMASK_NAME
	newmask = __int32($newmask)
	newmask_str = _stp_sigmask_str(__int32($newmask))
	@_SYSCALL_SSETMASK_ARGSTR
}
probe dw_syscall.ssetmask.return = kernel.function("sys_ssetmask").return ?
{
	@_SYSCALL_SSETMASK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_ssetmask _____________________________________________________

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

probe nd1_syscall.ssetmask = kprobe.function("sys_ssetmask") ?
{
	@_SYSCALL_SSETMASK_NAME
	asmlinkage()
	@_SYSCALL_SSETMASK_REGARGS
	@_SYSCALL_SSETMASK_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.ssetmask = kprobe.function(@arch_syscall_prefix "sys_ssetmask") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SSETMASK_NAME
	@_SYSCALL_SSETMASK_REGARGS
	@_SYSCALL_SSETMASK_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_SSETMASK_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ssetmask = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ssetmask"), @const("__NR_compat_ssetmask"))
	@_SYSCALL_SSETMASK_NAME
	@_SYSCALL_SSETMASK_REGARGS
	@_SYSCALL_SSETMASK_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_SSETMASK_REGARGS_STORE %)
}

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

probe nd1_syscall.ssetmask.return = kprobe.function("sys_ssetmask").return ?
{
	@_SYSCALL_SSETMASK_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.ssetmask.return = kprobe.function(@arch_syscall_prefix "sys_ssetmask").return ?
{
	@_SYSCALL_SSETMASK_NAME
	@SYSC_RETVALSTR(returnval())
}

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