93 lines
3.1 KiB
ArmAsm
93 lines
3.1 KiB
ArmAsm
/* $NetBSD: sdivsi3.S,v 1.12 2011/08/05 01:59:39 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>
|
|
#if defined(LIBC_SCCS)
|
|
RCSID("$NetBSD: sdivsi3.S,v 1.12 2011/08/05 01:59:39 uwe Exp $")
|
|
#endif
|
|
|
|
/*
|
|
* IMPOTANT: This function is special.
|
|
*
|
|
* This function is an auxiliary "millicode" function that is
|
|
* referenced by the code generated by gcc for signed integer
|
|
* division. But gcc does NOT treat a call to this function as an
|
|
* ordinary function call - it can clobber only R1, R2 and R3.
|
|
*
|
|
* See the definition of "divsi3_i1" in gcc/config/sh/sh.md
|
|
*
|
|
* As the consequence this function cannot be called via any
|
|
* indirection that assumes normal calling convention:
|
|
*
|
|
* . cannot have _PROF_PROLOGUE
|
|
* . cannot be called via PLT (not relevant for kernel)
|
|
*/
|
|
|
|
|
|
#ifdef __ELF__
|
|
.hidden __sdivsi3
|
|
#endif
|
|
|
|
|
|
/* r0 <= r4 / r5 */
|
|
NENTRY(__sdivsi3)
|
|
mov r4, r0
|
|
mov r5, r1
|
|
|
|
tst r1, r1
|
|
bt .L_div_by_zero
|
|
|
|
mov #0, r2
|
|
div0s r2, r0
|
|
subc r3, r3
|
|
subc r2, r0
|
|
div0s r1, r3
|
|
#define DIVSTEP rotcl r0; div1 r1, r3
|
|
/* 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 r0
|
|
|
|
rts
|
|
addc r2, r0
|
|
|
|
.L_div_by_zero:
|
|
rts
|
|
mov #0, r0
|