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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, long arg2,
#                  long arg3, long arg4, long arg5, long arg6, long arg7,
#                  struct pt_regs regs)
#

@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
%(systemtap_v <= "1.4" %?
	ss_uaddr = $uss
	oss_uaddr = $uoss
%)
	uss_uaddr = $uss
	uoss_uaddr = $uoss
%(systemtap_v < "2.3" %?
	regs = &$regs
%)
	uss_str = _stp_sigaltstack_u(uss_uaddr)
	@_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)
	uoss_uaddr = pointer_arg(2)
%(systemtap_v <= "2.8" %?
	ss_uaddr = uss_uaddr
	oss_uaddr = uoss_uaddr
%)
	uss_str = _stp_sigaltstack_u(uss_uaddr)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe nd_syscall.sigaltstack.return = kprobe.function("sys_sigaltstack").return
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR(returnval())
}
%)