udivsi3.S revision 1.7.62.1
1 1.7.62.1 yamt /* $NetBSD: udivsi3.S,v 1.7.62.1 2009/05/04 08:13:51 yamt Exp $ */ 2 1.1 itojun 3 1.1 itojun /*- 4 1.1 itojun * Copyright (c) 1990 The Regents of the University of California. 5 1.1 itojun * All rights reserved. 6 1.1 itojun * 7 1.1 itojun * This code is derived from software contributed to Berkeley by 8 1.1 itojun * William Jolitz. 9 1.1 itojun * 10 1.1 itojun * Redistribution and use in source and binary forms, with or without 11 1.1 itojun * modification, are permitted provided that the following conditions 12 1.1 itojun * are met: 13 1.1 itojun * 1. Redistributions of source code must retain the above copyright 14 1.1 itojun * notice, this list of conditions and the following disclaimer. 15 1.1 itojun * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 itojun * notice, this list of conditions and the following disclaimer in the 17 1.1 itojun * documentation and/or other materials provided with the distribution. 18 1.3 agc * 3. Neither the name of the University nor the names of its contributors 19 1.1 itojun * may be used to endorse or promote products derived from this software 20 1.1 itojun * without specific prior written permission. 21 1.1 itojun * 22 1.1 itojun * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.1 itojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.1 itojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.1 itojun * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.1 itojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.1 itojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.1 itojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.1 itojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.1 itojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.1 itojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.1 itojun * SUCH DAMAGE. 33 1.1 itojun * 34 1.1 itojun * from: @(#)udivsi3.s 5.1 (Berkeley) 5/15/90 35 1.1 itojun */ 36 1.1 itojun 37 1.1 itojun #include <machine/asm.h> 38 1.1 itojun #if defined(LIBC_SCCS) 39 1.7.62.1 yamt RCSID("$NetBSD: udivsi3.S,v 1.7.62.1 2009/05/04 08:13:51 yamt Exp $") 40 1.6 uwe #endif 41 1.6 uwe 42 1.6 uwe /* 43 1.6 uwe * IMPOTANT: This function is special. 44 1.6 uwe * 45 1.6 uwe * This function is an auxiliary function that is referenced by the 46 1.6 uwe * code generated by gcc for integer division. But gcc does NOT treat 47 1.6 uwe * a call to this function as an ordinary function call w.r.t. the set 48 1.6 uwe * of register this call clobbers. See the definition of "udivsi3_i1" 49 1.6 uwe * in gcc/config/sh/sh.md. 50 1.6 uwe * 51 1.6 uwe * Any call to this function MUST NOT clobber any registers besides r4 52 1.6 uwe * and r0, where the result is returned. At the time of the call the 53 1.6 uwe * r4 contains the first argument, so we are only left with r0, and we 54 1.6 uwe * cannot do anything meaningful using only one register. The 55 1.6 uwe * consequences are: 56 1.6 uwe * 57 1.6 uwe * . this function cannot have _PROF_PROLOGUE 58 1.6 uwe * . this function cannot be called via PLT 59 1.6 uwe */ 60 1.6 uwe 61 1.1 itojun 62 1.7.62.1 yamt #ifdef __ELF__ 63 1.7.62.1 yamt .hidden __udivsi3 64 1.7.62.1 yamt #endif 65 1.7.62.1 yamt 66 1.7.62.1 yamt 67 1.1 itojun /* r0 <= r4 / r5 */ 68 1.6 uwe NENTRY(__udivsi3) 69 1.1 itojun tst r5, r5 70 1.1 itojun bt div_by_zero 71 1.1 itojun 72 1.1 itojun mov #0, r0 73 1.1 itojun div0u 74 1.1 itojun #define DIVSTEP rotcl r4; div1 r5, r0 75 1.1 itojun /* repeat 32 times */ 76 1.1 itojun DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 77 1.1 itojun DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 78 1.1 itojun DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 79 1.1 itojun DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; 80 1.1 itojun #undef DIVSTEP 81 1.1 itojun rotcl r4 82 1.1 itojun 83 1.1 itojun rts 84 1.6 uwe mov r4, r0 85 1.1 itojun 86 1.1 itojun div_by_zero: 87 1.6 uwe #ifdef _KERNEL 88 1.1 itojun rts 89 1.6 uwe mov #0, r0 90 1.1 itojun #else 91 1.1 itojun mov.l r14, @-r15 92 1.1 itojun sts.l pr, @-r15 93 1.1 itojun mov r15, r14 94 1.1 itojun 95 1.1 itojun mov.l L_raise, r1 96 1.6 uwe #ifdef PIC 97 1.6 uwe 1: bsrf r1 98 1.6 uwe #else 99 1.1 itojun jsr @r1 100 1.6 uwe #endif 101 1.6 uwe mov #8, r4 /* delay slot. 8 <- SIGFPE. */ 102 1.1 itojun mov #0, r0 103 1.1 itojun 104 1.1 itojun lds.l @r15+, pr 105 1.1 itojun rts 106 1.6 uwe mov.l @r15+, r14 107 1.1 itojun 108 1.6 uwe .align 2 109 1.1 itojun L_raise: 110 1.6 uwe #ifdef PIC 111 1.6 uwe .long _C_LABEL(raise)-(1b+4) 112 1.6 uwe #else 113 1.6 uwe .long _C_LABEL(raise) 114 1.6 uwe #endif 115 1.1 itojun #endif 116
Indexes created Wed Oct 01 19:09:53 GMT 2025