udivsi3.S revision 1.7.2.2
1 1.7.2.2 tron /* $NetBSD: udivsi3.S,v 1.7.2.2 2006/05/24 15:50:42 tron Exp $ */ 2 1.7.2.2 tron 3 1.7.2.2 tron /*- 4 1.7.2.2 tron * Copyright (c) 1990 The Regents of the University of California. 5 1.7.2.2 tron * All rights reserved. 6 1.7.2.2 tron * 7 1.7.2.2 tron * This code is derived from software contributed to Berkeley by 8 1.7.2.2 tron * William Jolitz. 9 1.7.2.2 tron * 10 1.7.2.2 tron * Redistribution and use in source and binary forms, with or without 11 1.7.2.2 tron * modification, are permitted provided that the following conditions 12 1.7.2.2 tron * are met: 13 1.7.2.2 tron * 1. Redistributions of source code must retain the above copyright 14 1.7.2.2 tron * notice, this list of conditions and the following disclaimer. 15 1.7.2.2 tron * 2. Redistributions in binary form must reproduce the above copyright 16 1.7.2.2 tron * notice, this list of conditions and the following disclaimer in the 17 1.7.2.2 tron * documentation and/or other materials provided with the distribution. 18 1.7.2.2 tron * 3. Neither the name of the University nor the names of its contributors 19 1.7.2.2 tron * may be used to endorse or promote products derived from this software 20 1.7.2.2 tron * without specific prior written permission. 21 1.7.2.2 tron * 22 1.7.2.2 tron * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.7.2.2 tron * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.7.2.2 tron * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.7.2.2 tron * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.7.2.2 tron * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.7.2.2 tron * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.7.2.2 tron * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.7.2.2 tron * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.7.2.2 tron * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.7.2.2 tron * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.7.2.2 tron * SUCH DAMAGE. 33 1.7.2.2 tron * 34 1.7.2.2 tron * from: @(#)udivsi3.s 5.1 (Berkeley) 5/15/90 35 1.7.2.2 tron */ 36 1.7.2.2 tron 37 1.7.2.2 tron #include <machine/asm.h> 38 1.7.2.2 tron #if defined(LIBC_SCCS) 39 1.7.2.2 tron RCSID("$NetBSD: udivsi3.S,v 1.7.2.2 2006/05/24 15:50:42 tron Exp $") 40 1.7.2.2 tron #endif 41 1.7.2.2 tron 42 1.7.2.2 tron /* 43 1.7.2.2 tron * IMPOTANT: This function is special. 44 1.7.2.2 tron * 45 1.7.2.2 tron * This function is an auxiliary function that is referenced by the 46 1.7.2.2 tron * code generated by gcc for integer division. But gcc does NOT treat 47 1.7.2.2 tron * a call to this function as an ordinary function call w.r.t. the set 48 1.7.2.2 tron * of register this call clobbers. See the definition of "udivsi3_i1" 49 1.7.2.2 tron * in gcc/config/sh/sh.md. 50 1.7.2.2 tron * 51 1.7.2.2 tron * Any call to this function MUST NOT clobber any registers besides r4 52 1.7.2.2 tron * and r0, where the result is returned. At the time of the call the 53 1.7.2.2 tron * r4 contains the first argument, so we are only left with r0, and we 54 1.7.2.2 tron * cannot do anything meaningful using only one register. The 55 1.7.2.2 tron * consequences are: 56 1.7.2.2 tron * 57 1.7.2.2 tron * . this function cannot have _PROF_PROLOGUE 58 1.7.2.2 tron * . this function cannot be called via PLT 59 1.7.2.2 tron */ 60 1.7.2.2 tron 61 1.7.2.2 tron 62 1.7.2.2 tron /* r0 <= r4 / r5 */ 63 1.7.2.2 tron NENTRY(__udivsi3) 64 1.7.2.2 tron tst r5, r5 65 1.7.2.2 tron bt div_by_zero 66 1.7.2.2 tron 67 1.7.2.2 tron mov #0, r0 68 1.7.2.2 tron div0u 69 1.7.2.2 tron #define DIVSTEP rotcl r4; div1 r5, r0 70 1.7.2.2 tron /* repeat 32 times */ 71 1.7.2.2 tron DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 72 1.7.2.2 tron DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 73 1.7.2.2 tron DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 74 1.7.2.2 tron DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 75 1.7.2.2 tron #undef DIVSTEP 76 1.7.2.2 tron rotcl r4 77 1.7.2.2 tron 78 1.7.2.2 tron rts 79 1.7.2.2 tron mov r4, r0 80 1.7.2.2 tron 81 1.7.2.2 tron div_by_zero: 82 1.7.2.2 tron #ifdef _KERNEL 83 1.7.2.2 tron rts 84 1.7.2.2 tron mov #0, r0 85 1.7.2.2 tron #else 86 1.7.2.2 tron mov.l r14, @-r15 87 1.7.2.2 tron sts.l pr, @-r15 88 1.7.2.2 tron mov r15, r14 89 1.7.2.2 tron 90 1.7.2.2 tron mov.l L_raise, r1 91 1.7.2.2 tron #ifdef PIC 92 1.7.2.2 tron 1: bsrf r1 93 1.7.2.2 tron #else 94 1.7.2.2 tron jsr @r1 95 1.7.2.2 tron #endif 96 1.7.2.2 tron mov #8, r4 /* delay slot. 8 <- SIGFPE. */ 97 1.7.2.2 tron mov #0, r0 98 1.7.2.2 tron 99 1.7.2.2 tron lds.l @r15+, pr 100 1.7.2.2 tron rts 101 1.7.2.2 tron mov.l @r15+, r14 102 1.7.2.2 tron 103 1.7.2.2 tron .align 2 104 1.7.2.2 tron L_raise: 105 1.7.2.2 tron #ifdef PIC 106 1.7.2.2 tron .long _C_LABEL(raise)-(1b+4) 107 1.7.2.2 tron #else 108 1.7.2.2 tron .long _C_LABEL(raise) 109 1.7.2.2 tron #endif 110 1.7.2.2 tron #endif 111
Indexes created Wed Oct 01 19:09:53 GMT 2025