udivsi3.S revision 1.6.2.2
1 1.6.2.2 elad /* $NetBSD: udivsi3.S,v 1.6.2.2 2006/05/11 23:31:08 elad Exp $ */ 2 1.6.2.2 elad 3 1.6.2.2 elad /*- 4 1.6.2.2 elad * Copyright (c) 1990 The Regents of the University of California. 5 1.6.2.2 elad * All rights reserved. 6 1.6.2.2 elad * 7 1.6.2.2 elad * This code is derived from software contributed to Berkeley by 8 1.6.2.2 elad * William Jolitz. 9 1.6.2.2 elad * 10 1.6.2.2 elad * Redistribution and use in source and binary forms, with or without 11 1.6.2.2 elad * modification, are permitted provided that the following conditions 12 1.6.2.2 elad * are met: 13 1.6.2.2 elad * 1. Redistributions of source code must retain the above copyright 14 1.6.2.2 elad * notice, this list of conditions and the following disclaimer. 15 1.6.2.2 elad * 2. Redistributions in binary form must reproduce the above copyright 16 1.6.2.2 elad * notice, this list of conditions and the following disclaimer in the 17 1.6.2.2 elad * documentation and/or other materials provided with the distribution. 18 1.6.2.2 elad * 3. Neither the name of the University nor the names of its contributors 19 1.6.2.2 elad * may be used to endorse or promote products derived from this software 20 1.6.2.2 elad * without specific prior written permission. 21 1.6.2.2 elad * 22 1.6.2.2 elad * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.6.2.2 elad * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.6.2.2 elad * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.6.2.2 elad * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.6.2.2 elad * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.6.2.2 elad * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.6.2.2 elad * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.6.2.2 elad * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.6.2.2 elad * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.6.2.2 elad * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.6.2.2 elad * SUCH DAMAGE. 33 1.6.2.2 elad * 34 1.6.2.2 elad * from: @(#)udivsi3.s 5.1 (Berkeley) 5/15/90 35 1.6.2.2 elad */ 36 1.6.2.2 elad 37 1.6.2.2 elad #include <machine/asm.h> 38 1.6.2.2 elad #if defined(LIBC_SCCS) 39 1.6.2.2 elad RCSID("$NetBSD: udivsi3.S,v 1.6.2.2 2006/05/11 23:31:08 elad Exp $") 40 1.6.2.2 elad #endif 41 1.6.2.2 elad 42 1.6.2.2 elad /* 43 1.6.2.2 elad * IMPOTANT: This function is special. 44 1.6.2.2 elad * 45 1.6.2.2 elad * This function is an auxiliary function that is referenced by the 46 1.6.2.2 elad * code generated by gcc for integer division. But gcc does NOT treat 47 1.6.2.2 elad * a call to this function as an ordinary function call w.r.t. the set 48 1.6.2.2 elad * of register this call clobbers. See the definition of "udivsi3_i1" 49 1.6.2.2 elad * in gcc/config/sh/sh.md. 50 1.6.2.2 elad * 51 1.6.2.2 elad * Any call to this function MUST NOT clobber any registers besides r4 52 1.6.2.2 elad * and r0, where the result is returned. At the time of the call the 53 1.6.2.2 elad * r4 contains the first argument, so we are only left with r0, and we 54 1.6.2.2 elad * cannot do anything meaningful using only one register. The 55 1.6.2.2 elad * consequences are: 56 1.6.2.2 elad * 57 1.6.2.2 elad * . this function cannot have _PROF_PROLOGUE 58 1.6.2.2 elad * . this function cannot be called via PLT 59 1.6.2.2 elad */ 60 1.6.2.2 elad 61 1.6.2.2 elad #ifdef PIC /* XXX: uwe */ 62 1.6.2.2 elad .hidden __udivsi3 63 1.6.2.2 elad #endif 64 1.6.2.2 elad 65 1.6.2.2 elad /* r0 <= r4 / r5 */ 66 1.6.2.2 elad NENTRY(__udivsi3) 67 1.6.2.2 elad tst r5, r5 68 1.6.2.2 elad bt div_by_zero 69 1.6.2.2 elad 70 1.6.2.2 elad mov #0, r0 71 1.6.2.2 elad div0u 72 1.6.2.2 elad #define DIVSTEP rotcl r4; div1 r5, r0 73 1.6.2.2 elad /* repeat 32 times */ 74 1.6.2.2 elad DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 75 1.6.2.2 elad DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 76 1.6.2.2 elad DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 77 1.6.2.2 elad DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 78 1.6.2.2 elad #undef DIVSTEP 79 1.6.2.2 elad rotcl r4 80 1.6.2.2 elad 81 1.6.2.2 elad rts 82 1.6.2.2 elad mov r4, r0 83 1.6.2.2 elad 84 1.6.2.2 elad div_by_zero: 85 1.6.2.2 elad #ifdef _KERNEL 86 1.6.2.2 elad rts 87 1.6.2.2 elad mov #0, r0 88 1.6.2.2 elad #else 89 1.6.2.2 elad mov.l r14, @-r15 90 1.6.2.2 elad sts.l pr, @-r15 91 1.6.2.2 elad mov r15, r14 92 1.6.2.2 elad 93 1.6.2.2 elad mov.l L_raise, r1 94 1.6.2.2 elad #ifdef PIC 95 1.6.2.2 elad 1: bsrf r1 96 1.6.2.2 elad #else 97 1.6.2.2 elad jsr @r1 98 1.6.2.2 elad #endif 99 1.6.2.2 elad mov #8, r4 /* delay slot. 8 <- SIGFPE. */ 100 1.6.2.2 elad mov #0, r0 101 1.6.2.2 elad 102 1.6.2.2 elad lds.l @r15+, pr 103 1.6.2.2 elad rts 104 1.6.2.2 elad mov.l @r15+, r14 105 1.6.2.2 elad 106 1.6.2.2 elad .align 2 107 1.6.2.2 elad L_raise: 108 1.6.2.2 elad #ifdef PIC 109 1.6.2.2 elad .long _C_LABEL(raise)-(1b+4) 110 1.6.2.2 elad #else 111 1.6.2.2 elad .long _C_LABEL(raise) 112 1.6.2.2 elad #endif 113 1.6.2.2 elad #endif 114
Indexes created Wed Oct 01 19:09:53 GMT 2025