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%( CONFIG_GENERIC_SIGALTSTACK == "n" || kernel_v < "3.8" %?
# sigaltstack ________________________________________________
# long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
#		       unsigned long r5, unsigned long r6,
#		       unsigned long r7, unsigned long r8,
#		       struct pt_regs *regs)
#
# 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 = $regs
%)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe dw_syscall.sigaltstack.return = kernel.function("sys_sigaltstack").return
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR($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 = pointer_arg(7)
%)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe nd_syscall.sigaltstack.return =
	kprobe.function("sys_sigaltstack").return
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR(returnval())
}

# sys32_sigaltstack ________________________________________
#
# int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
#		             int r6, int r7, int r8, struct pt_regs *regs)
# int sys32_sigaltstack(u32 __new, u32 __old, int r5,
#			int r6, int r7, int r8, struct pt_regs *regs)
#

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("compat_sys_sigaltstack").call !,
	kernel.function("sys32_sigaltstack").call ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	uss_uaddr = @__pointer($__new)
	uss_str = _stp_compat_sigaltstack_u(uss_uaddr)
	uoss_uaddr = @__pointer($__old)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe dw_syscall.sys32_sigaltstack.return =
	kernel.function("compat_sys_sigaltstack").return !,
	kernel.function("sys32_sigaltstack").return ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sys32_sigaltstack _____________________________________________________

probe nd_syscall.sys32_sigaltstack =
	kprobe.function("compat_sys_sigaltstack") !,
	kprobe.function("sys32_sigaltstack") ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	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("compat_sys_sigaltstack").return !,
	kprobe.function("sys32_sigaltstack").return ?
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR(returnval())
}
%)