/* $NetBSD: udivsi3.S,v 1.11 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: udivsi3.S,v 1.11 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 unsigned integer * division. But gcc does NOT treat a call to this function as an * ordinary function call - it can clobber only R4. * * See the definition of "udivsi3_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 __udivsi3 #endif /* r0 <= r4 / r5 */ NENTRY(__udivsi3) tst r5, r5 bt .L_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 .L_div_by_zero: rts mov #0, r0 |