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%( CONFIG_GENERIC_SIGALTSTACK == "n" || kernel_v < "3.8" %?
# sigaltstack ________________________________________________
# asmlinkage long
# sys_sigaltstack(const stack_t __user * uss, stack_t __user *uoss)
#
# NOTE: args vary between archs.

@define _SYSCALL_SIGALTSTACK_NAME
%(
	name = "sigaltstack"
%)

@define _SYSCALL_SIGALTSTACK_ARGSTR
%(
	argstr = sprintf("%s, %p", uss_str, uoss_uaddr)
%)

probe syscall.sigaltstack = dw_syscall.sigaltstack !, nd_syscall.sigaltstack {}
probe syscall.sigaltstack.return = dw_syscall.sigaltstack.return !, nd_syscall.sigaltstack.return {}

# dw_sigaltstack _____________________________________________________

probe dw_syscall.sigaltstack = kernel.function("sys_sigaltstack")
{
	@_SYSCALL_SIGALTSTACK_NAME
	uss_uaddr = $uss
	uss_str = _stp_sigaltstack_u(uss_uaddr)
	uoss_uaddr = $uoss
%(systemtap_v < "2.3" %?
	regs = %{ /* pure */ _stp_current_pt_regs() %}
%)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe dw_syscall.sigaltstack.return = kernel.function("sys_sigaltstack").return
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sigaltstack _____________________________________________________

probe nd_syscall.sigaltstack = kprobe.function("sys_sigaltstack")
{
	@_SYSCALL_SIGALTSTACK_NAME
	asmlinkage()
	uss_uaddr = pointer_arg(1)
	uss_str = _stp_sigaltstack_u(uss_uaddr)
	uoss_uaddr = pointer_arg(2)
%(systemtap_v < "2.3" %?
	regs = %{ /* pure */ _stp_current_pt_regs() %}
%)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe nd_syscall.sigaltstack.return = kprobe.function("sys_sigaltstack").return
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR(returnval())
}

# sys32_sigaltstack ________________________________________________
# asmlinkage long
# sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
#
# NOTE: args vary between archs.

probe syscall.sys32_sigaltstack = dw_syscall.sys32_sigaltstack !,
                                  nd_syscall.sys32_sigaltstack ? {}
probe syscall.sys32_sigaltstack.return = dw_syscall.sys32_sigaltstack.return !,
                                         nd_syscall.sys32_sigaltstack.return ? {}

# dw_sys32_sigaltstack _____________________________________________________

probe dw_syscall.sys32_sigaltstack = kernel.function("sys32_sigaltstack") ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	uss_uaddr = $uss
	uss_str = _stp_compat_sigaltstack_u(uss_uaddr)
	uoss_uaddr = $uoss
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe dw_syscall.sys32_sigaltstack.return = kernel.function("sys32_sigaltstack").return ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sys32_sigaltstack _____________________________________________________

probe nd_syscall.sys32_sigaltstack = kprobe.function("sys32_sigaltstack") ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	asmlinkage()
	uss_uaddr = pointer_arg(1)
	uss_str = _stp_compat_sigaltstack_u(uss_uaddr)
	uoss_uaddr = pointer_arg(2)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe nd_syscall.sys32_sigaltstack.return =
	kprobe.function("sys32_sigaltstack").return ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR(returnval())
}
%)