Add missing linux68k platform and liblinux support library.

--HG--
branch : dtrg-experimental-powerpc

plat/linux68k/libsys/_syscall.s

@@ -0,0 +1,45 @@
+#
+! $Source: /cvsroot/tack/Ack/plat/linux386/libsys/_syscall.s,v $
+! $State: Exp $
+! $Revision: 1.1 $
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.sect .text
+
+EINVAL = 22
+	
+! Perform a Linux system call.
+
+.define __syscall
+__syscall:
+	move.l (4, sp), d0
+	move.l (8, sp), d1
+	move.l (12, sp), d2
+	move.l (16, sp), d3
+	trap #0
+	
+	tst.l d0
+	bmi 1f
+	rts
+	
+1:
+	neg.l d0
+	! It just so happens that errnos 1-34 are the same in Linux as in ACK.
+	cmp.l #1, d0
+	blt 2f
+	cmp.l #34, d0
+	bgt 2f
+	move.l d0, (_errno)
+3:
+	move.l #-1, d0
+	rts
+	
+2:
+	move.l #EINVAL, (_errno)
+	bra 3b

plat/linux68k/libsys/pmfile

@@ -0,0 +1,13 @@
+-- $Source: /cvsroot/tack/Ack/plat/linux386/libsys/pmfile,v $
+-- $State: Exp $
+-- $Revision: 1.1 $
+
+local d = ROOTDIR.."plat/linux68k/libsys/"
+
+libsys_linux68k = acklibrary {
+	ACKINCLUDES = {"%BINDIR%include"},
+	
+	ackfile (d.."_syscall.s"),
+	
+	install = pm.install("%BINDIR%lib/%PLATFORM%/libsys.a"),
+}