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authorTejun Heo <tj@kernel.org>2011-05-24 09:59:36 +0200
committerTejun Heo <tj@kernel.org>2011-05-24 09:59:36 +0200
commit6988f20fe04e9ef3aea488cb8ab57fbeb78e12f0 (patch)
treec9d7fc50a2e2147a5ca07e3096e7eeb916ad2da9 /arch/m68k/lib/divsi3.S
parent0415b00d175e0d8945e6785aad21b5f157976ce0 (diff)
parent6ea0c34dac89611126455537552cffe6c7e832ad (diff)
Merge branch 'fixes-2.6.39' into for-2.6.40
Diffstat (limited to 'arch/m68k/lib/divsi3.S')
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1 files changed, 125 insertions, 0 deletions
diff --git a/arch/m68k/lib/divsi3.S b/arch/m68k/lib/divsi3.S
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+/* libgcc1 routines for 68000 w/o floating-point hardware.
+ Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file with other programs, and to distribute
+those programs without any restriction coming from the use of this
+file. (The General Public License restrictions do apply in other
+respects; for example, they cover modification of the file, and
+distribution when not linked into another program.)
+
+This file 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING. If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* As a special exception, if you link this library with files
+ compiled with GCC to produce an executable, this does not cause
+ the resulting executable to be covered by the GNU General Public License.
+ This exception does not however invalidate any other reasons why
+ the executable file might be covered by the GNU General Public License. */
+
+/* Use this one for any 680x0; assumes no floating point hardware.
+ The trailing " '" appearing on some lines is for ANSI preprocessors. Yuk.
+ Some of this code comes from MINIX, via the folks at ericsson.
+ D. V. Henkel-Wallace (gumby@cygnus.com) Fete Bastille, 1992
+*/
+
+/* These are predefined by new versions of GNU cpp. */
+
+#ifndef __USER_LABEL_PREFIX__
+#define __USER_LABEL_PREFIX__ _
+#endif
+
+#ifndef __REGISTER_PREFIX__
+#define __REGISTER_PREFIX__
+#endif
+
+#ifndef __IMMEDIATE_PREFIX__
+#define __IMMEDIATE_PREFIX__ #
+#endif
+
+/* ANSI concatenation macros. */
+
+#define CONCAT1(a, b) CONCAT2(a, b)
+#define CONCAT2(a, b) a ## b
+
+/* Use the right prefix for global labels. */
+
+#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
+
+/* Use the right prefix for registers. */
+
+#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x)
+
+/* Use the right prefix for immediate values. */
+
+#define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x)
+
+#define d0 REG (d0)
+#define d1 REG (d1)
+#define d2 REG (d2)
+#define d3 REG (d3)
+#define d4 REG (d4)
+#define d5 REG (d5)
+#define d6 REG (d6)
+#define d7 REG (d7)
+#define a0 REG (a0)
+#define a1 REG (a1)
+#define a2 REG (a2)
+#define a3 REG (a3)
+#define a4 REG (a4)
+#define a5 REG (a5)
+#define a6 REG (a6)
+#define fp REG (fp)
+#define sp REG (sp)
+
+ .text
+ .proc
+ .globl SYM (__divsi3)
+SYM (__divsi3):
+ movel d2, sp@-
+
+ moveq IMM (1), d2 /* sign of result stored in d2 (=1 or =-1) */
+ movel sp@(12), d1 /* d1 = divisor */
+ jpl L1
+ negl d1
+#if !(defined(__mcf5200__) || defined(__mcoldfire__))
+ negb d2 /* change sign because divisor <0 */
+#else
+ negl d2 /* change sign because divisor <0 */
+#endif
+L1: movel sp@(8), d0 /* d0 = dividend */
+ jpl L2
+ negl d0
+#if !(defined(__mcf5200__) || defined(__mcoldfire__))
+ negb d2
+#else
+ negl d2
+#endif
+
+L2: movel d1, sp@-
+ movel d0, sp@-
+ jbsr SYM (__udivsi3) /* divide abs(dividend) by abs(divisor) */
+ addql IMM (8), sp
+
+ tstb d2
+ jpl L3
+ negl d0
+
+L3: movel sp@+, d2
+ rts
+