Move m68k from ports to libc

1 files changed, 88 insertions, 0 deletions

diff --git a/sysdeps/m68k/m680x0/m68020/submul_1.S b/sysdeps/m68k/m680x0/m68020/submul_1.S
new file mode 100644
index 0000000000..b7c60d4b89
--- /dev/null
+++ b/sysdeps/m68k/m680x0/m68020/submul_1.S
@@ -0,0 +1,88 @@
+/* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
+   the result from a second 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)
+  s1_size	(sp + 12)
+  s2_limb	(sp + 16)
+*/
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+	TEXT
+ENTRY(__mpn_submul_1)
+
+#define res_ptr a0
+#define s1_ptr a1
+#define s1_size d2
+#define s2_limb d4
+
+/* Save used registers on the stack.  */
+	moveml	R(d2)-R(d5),MEM_PREDEC(sp)
+	cfi_adjust_cfa_offset (4*4)
+	cfi_rel_offset (R(d2), 0)
+	cfi_rel_offset (R(d3), 4)
+	cfi_rel_offset (R(d4), 8)
+	cfi_rel_offset (R(d5), 12)
+
+/* Copy the arguments to registers.  Better use movem?  */
+	movel	MEM_DISP(sp,20),R(res_ptr)
+	movel	MEM_DISP(sp,24),R(s1_ptr)
+	movel	MEM_DISP(sp,28),R(s1_size)
+	movel	MEM_DISP(sp,32),R(s2_limb)
+
+	eorw	#1,R(s1_size)
+	clrl	R(d1)
+	clrl	R(d5)
+	lsrl	#1,R(s1_size)
+	bcc	L(L1)
+	subql	#1,R(s1_size)
+	subl	R(d0),R(d0)	/* (d0,cy) <= (0,0) */
+
+L(Loop:)
+	movel	MEM_POSTINC(s1_ptr),R(d3)
+	mulul	R(s2_limb),R(d1):R(d3)
+	addxl	R(d0),R(d3)
+	addxl	R(d5),R(d1)
+	subl	R(d3),MEM_POSTINC(res_ptr)
+L(L1:)	movel	MEM_POSTINC(s1_ptr),R(d3)
+	mulul	R(s2_limb),R(d0):R(d3)
+	addxl	R(d1),R(d3)
+	addxl	R(d5),R(d0)
+	subl	R(d3),MEM_POSTINC(res_ptr)
+
+	dbf	R(s1_size),L(Loop)
+	addxl	R(d5),R(d0)
+	subl	#0x10000,R(s1_size)
+	bcc	L(Loop)
+
+/* Restore used registers from stack frame.  */
+	moveml	MEM_POSTINC(sp),R(d2)-R(d5)
+	cfi_adjust_cfa_offset (-4*4)
+	cfi_restore (R(d2))
+	cfi_restore (R(d3))
+	cfi_restore (R(d4))
+	cfi_restore (R(d5))
+
+	rts
+END(__mpn_submul_1)