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Filename : sysc_rt_sigaction.stp
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# rt_sigaction _______________________________________________
#
# sys_rt_sigaction(int sig,
#			const struct sigaction __user *act,
#			struct sigaction __user *oact,
#			size_t sigsetsize)
#

@define _SYSCALL_RT_SIGACTION_NAME
%(
	name = "rt_sigaction"
%)

@define _SYSCALL_RT_SIGACTION_ARGSTR
%(
	argstr = sprintf("%s, {%s}, %p, %d", sig_str, act_str, oact_uaddr, sigsetsize) 
%)

@define _SYSCALL_RT_SIGACTION_REGARGS
%(
	sig = int_arg(1)
	sig_str = _signal_name(sig)
	act_uaddr = pointer_arg(2)
	act_str = _struct_sigaction_u(act_uaddr)
	oact_uaddr = pointer_arg(3)
	sigsetsize = ulong_arg(4)
%)

@define _SYSCALL_RT_SIGACTION32_REGARGS
%(
	sig = int_arg(1)
	sig_str = _signal_name(sig)
	act_uaddr = pointer_arg(2)
	act_str = _struct_sigaction32_u(act_uaddr)
	oact_uaddr = pointer_arg(3)
	sigsetsize = uint_arg(4)
%)

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

# dw_rt_sigaction _____________________________________________________

probe dw_syscall.rt_sigaction = kernel.function("sys_rt_sigaction").call ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	sig = __int32($sig)
	sig_str = _signal_name(sig)
	act_uaddr = $act
	act_str = _struct_sigaction_u(act_uaddr)
	oact_uaddr = $oact
	sigsetsize = $sigsetsize
	@_SYSCALL_RT_SIGACTION_ARGSTR
}
probe dw_syscall.rt_sigaction.return = kernel.function("sys_rt_sigaction").return ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR($return)
}

# nd_rt_sigaction _____________________________________________________

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

probe nd1_syscall.rt_sigaction = kprobe.function("sys_rt_sigaction") ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	asmlinkage()
	@_SYSCALL_RT_SIGACTION_REGARGS
	@_SYSCALL_RT_SIGACTION_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.rt_sigaction = kprobe.function(@arch_syscall_prefix "sys_rt_sigaction") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_RT_SIGACTION_NAME
	@_SYSCALL_RT_SIGACTION_REGARGS
	@_SYSCALL_RT_SIGACTION_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.rt_sigaction = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_rt_sigaction"))
	@_SYSCALL_RT_SIGACTION_NAME
	@_SYSCALL_RT_SIGACTION_REGARGS
	@_SYSCALL_RT_SIGACTION_ARGSTR
}

probe nd_syscall.rt_sigaction.return = nd1_syscall.rt_sigaction.return!, nd2_syscall.rt_sigaction.return!, tp_syscall.rt_sigaction.return
  { }
  
probe nd1_syscall.rt_sigaction.return =
	kprobe.function("sys_rt_sigaction").return ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.rt_sigaction.return = kprobe.function(@arch_syscall_prefix "sys_rt_sigaction").return ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.rt_sigaction.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_rt_sigaction"))
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR($ret)
}

# long sys32_rt_sigaction(int sig,
#		struct sigaction32 __user *act,
#		struct sigaction32 __user *oact,
#		unsigned int sigsetsize)
# ppc only
# compat_sys_rt_sigaction(int sig,
#			const struct sigaction32 __user *act,
#			struct sigaction32 __user *oact,
#			size_t sigsetsize)

probe syscall.rt_sigaction32 = dw_syscall.rt_sigaction32 !,
                               nd_syscall.rt_sigaction32 ? {}
probe syscall.rt_sigaction32.return = dw_syscall.rt_sigaction32.return !,
                                      nd_syscall.rt_sigaction32.return ? {}

# dw_rt_sigaction32 _____________________________________________________

probe dw_syscall.rt_sigaction32 = kernel.function("sys32_rt_sigaction").call ?,
                               kernel.function("compat_sys_rt_sigaction").call ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	sig = __int32($sig)
	sig_str = _signal_name(sig)
	act_uaddr = @__pointer($act)
	act_str = _struct_sigaction32_u(act_uaddr)
	oact_uaddr = $oact
	sigsetsize = $sigsetsize
	@_SYSCALL_RT_SIGACTION_ARGSTR
}
probe dw_syscall.rt_sigaction32.return =
	kernel.function("sys32_rt_sigaction").return ?,
	kernel.function("compat_sys_rt_sigaction").return ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR($return)
}

# nd_rt_sigaction32 _____________________________________________________

probe nd_syscall.rt_sigaction32 = nd1_syscall.rt_sigaction32!, nd2_syscall.rt_sigaction32!, tp_syscall.rt_sigaction32
  { }

probe nd1_syscall.rt_sigaction32 = kprobe.function("sys32_rt_sigaction") ?,
                                   kprobe.function("compat_sys_rt_sigaction") ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	asmlinkage()
	@_SYSCALL_RT_SIGACTION32_REGARGS
	@_SYSCALL_RT_SIGACTION_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.rt_sigaction32 =
	kprobe.function(@arch_syscall_prefix "compat_sys_rt_sigaction") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_RT_SIGACTION_NAME
	@_SYSCALL_RT_SIGACTION32_REGARGS
	@_SYSCALL_RT_SIGACTION_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.rt_sigaction32 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_rt_sigaction"))
	@_SYSCALL_RT_SIGACTION_NAME
	@_SYSCALL_RT_SIGACTION32_REGARGS
	@_SYSCALL_RT_SIGACTION_ARGSTR
}

probe nd_syscall.rt_sigaction32.return = nd1_syscall.rt_sigaction32.return!, nd2_syscall.rt_sigaction32.return!, tp_syscall.rt_sigaction32.return
  { }
  
probe nd1_syscall.rt_sigaction32.return =
	kprobe.function("sys32_rt_sigaction").return ?,
	kprobe.function("compat_sys_rt_sigaction").return ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.rt_sigaction32.return =
	kprobe.function(@arch_syscall_prefix "compat_sys_rt_sigaction").return ?
{
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.rt_sigaction32.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_rt_sigaction"))
	@_SYSCALL_RT_SIGACTION_NAME
	@SYSC_RETVALSTR($ret)
}