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/* $NetBSD: udivsi3.S,v 1.7 2006/05/22 20:56:44 uwe Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)udivsi3.s 5.1 (Berkeley) 5/15/90
*/
#include <machine/asm.h>
/*
* IMPORTANT: This function is special.
*
* This function is an auxiliary function that is referenced by the
* code generated by gcc for integer division. But gcc does NOT treat
* a call to this function as an ordinary function call w.r.t. the set
* of register this call clobbers. See the definition of "udivsi3_i1"
* in gcc/config/sh/sh.md.
*
* Any call to this function MUST NOT clobber any registers besides r4
* and r0, where the result is returned. At the time of the call the
* r4 contains the first argument, so we are only left with r0, and we
* cannot do anything meaningful using only one register. The
* consequences are:
*
* . this function cannot have _PROF_PROLOGUE
* . this function cannot be called via PLT
*/
/* r0 <= r4 / r5 */
NENTRY(__udivsi3)
tst r5, r5
bt div_by_zero
mov #0, r0
div0u
#define DIVSTEP rotcl r4; div1 r5, r0
/* repeat 32 times */
DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
#undef DIVSTEP
rotcl r4
rts
mov r4, r0
div_by_zero:
#ifdef _KERNEL
rts
mov #0, r0
#else
mov.l r14, @-r15
sts.l pr, @-r15
mov r15, r14
mov.l L_raise, r1
#ifdef PIC
1: bsrf r1
#else
jsr @r1
#endif
mov #8, r4 /* delay slot. 8 <- SIGFPE. */
mov #0, r0
lds.l @r15+, pr
rts
mov.l @r15+, r14
.align 2
L_raise:
#ifdef PIC
.long _C_LABEL(raise)-(1b+4)
#else
.long _C_LABEL(raise)
#endif
#endif
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