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%( CONFIG_GENERIC_SIGALTSTACK == "n" || kernel_v < "3.8" %?
# sigaltstack ________________________________________________
# int sys_sigaltstack(unsigned long ebx)
#
# 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
# 'ussp' should have been 'uss_uaddr.  Deprecate the old name.
%(systemtap_v <= "1.4" %?
	ussp = %( kernel_vr < "2.6.25" %? $ebx %: %( kernel_vr < "2.6.30" %? $bx %: $regs->bx %) %)
%)
	if (@defined($regs)) {
		uss_uaddr = @choose_defined($uss, $regs->bx)
		uoss_uaddr = @choose_defined($uoss, $regs->cx)
%(systemtap_v < "2.3" %?
		regs = $regs
%)
	}
	else if (@defined($bx)) {	# kernels < "2.6.30"
		uss_uaddr = $bx
		# Make sure the register value didn't get sign extended.
		uoss_uaddr = __ulong(@cast(&$bx, "pt_regs", "kernel<asm/ptrace.h>")->cx)
%(systemtap_v < "2.3" %?
		regs = &$bx
%)
	}
	else {				# kernels < "2.6.25"
		uss_uaddr = $ebx
		# Make sure the register value didn't get sign extended.
		uoss_uaddr = __ulong(@cast(&$ebx, "pt_regs", "kernel<asm/ptrace.h>")->ecx)
%(systemtap_v < "2.3" %?
		regs = &$ebx
%)
	}
	uss_str = _stp_sigaltstack_u(uss_uaddr)
	@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe dw_syscall.sigaltstack.return = kernel.function("sys_sigaltstack").return
{
	@_SYSCALL_SIGALTSTACK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sigaltstack _____________________________________________________

probe nd_syscall.sigaltstack = kprobe.function("sys_sigaltstack")
{
	@_SYSCALL_SIGALTSTACK_NAME
	asmlinkage()
	// Sigh, it doesn't seem possible to get the address of regs
	// here without dipping down into deep mojo.
	__regs = __ulong(register("esp")) + 4
	uss_uaddr = __ulong(@choose_defined(@cast(__regs, "pt_regs", "kernel<asm/ptrace.h>")->bx,
					    @cast(__regs, "pt_regs", "kernel<asm/ptrace.h>")->ebx))
%(systemtap_v <= "1.4" %?
	ussp = uss_uaddr
%)
	uoss_uaddr = __ulong(@choose_defined(@cast(__regs, "pt_regs", "kernel<asm/ptrace.h>")->cx,
					     @cast(__regs, "pt_regs", "kernel<asm/ptrace.h>")->ecx))
	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())
}
%)