Move m68k from ports to libc

1 files changed, 82 insertions, 0 deletions

diff --git a/sysdeps/m68k/m680x0/sub_n.S b/sysdeps/m68k/m680x0/sub_n.S
new file mode 100644
index 0000000000..6c6d92e6f5
--- /dev/null
+++ b/sysdeps/m68k/m680x0/sub_n.S
@@ -0,0 +1,82 @@
+/* mc68020 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+   store difference in a third limb vector.
+
+Copyright (C) 1992-2014 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/*
+  INPUT PARAMETERS
+  res_ptr	(sp + 4)
+  s1_ptr	(sp + 8)
+  s2_ptr	(sp + 16)
+  size		(sp + 12)
+*/
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+	TEXT
+ENTRY(__mpn_sub_n)
+/* Save used registers on the stack.  */
+	movel	R(d2),MEM_PREDEC(sp)
+	cfi_adjust_cfa_offset (4)
+	movel	R(a2),MEM_PREDEC(sp)
+	cfi_adjust_cfa_offset (4)
+	cfi_rel_offset (R(d2), 4)
+	cfi_rel_offset (R(a2), 0)
+
+/* Copy the arguments to registers.  Better use movem?  */
+	movel	MEM_DISP(sp,12),R(a2)
+	movel	MEM_DISP(sp,16),R(a0)
+	movel	MEM_DISP(sp,20),R(a1)
+	movel	MEM_DISP(sp,24),R(d2)
+
+	eorw	#1,R(d2)
+	lsrl	#1,R(d2)
+	bcc	L(L1)
+	subql	#1,R(d2)	/* clears cy as side effect */
+
+L(Loop:)
+	movel	MEM_POSTINC(a0),R(d0)
+	movel	MEM_POSTINC(a1),R(d1)
+	subxl	R(d1),R(d0)
+	movel	R(d0),MEM_POSTINC(a2)
+L(L1:)	movel	MEM_POSTINC(a0),R(d0)
+	movel	MEM_POSTINC(a1),R(d1)
+	subxl	R(d1),R(d0)
+	movel	R(d0),MEM_POSTINC(a2)
+
+	dbf	R(d2),L(Loop)		/* loop until 16 lsb of %4 == -1 */
+	subxl	R(d0),R(d0)	/* d0 <= -cy; save cy as 0 or -1 in d0 */
+	subl	#0x10000,R(d2)
+	bcs	L(L2)
+	addl	R(d0),R(d0)	/* restore cy */
+	bra	L(Loop)
+
+L(L2:)
+	negl	R(d0)
+
+/* Restore used registers from stack frame.  */
+	movel	MEM_POSTINC(sp),R(a2)
+	cfi_adjust_cfa_offset (-4)
+	cfi_restore (R(a2))
+	movel	MEM_POSTINC(sp),R(d2)
+	cfi_adjust_cfa_offset (-4)
+	cfi_restore (R(d2))
+
+	rts
+END(__mpn_sub_n)