f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
129 lines
3.6 KiB
ArmAsm
129 lines
3.6 KiB
ArmAsm
/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: __aeabi_ldivmod.S,v 1.1 2012/08/05 06:33:51 matt Exp $")
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ENTRY(__aeabi_ldivmod)
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push {r4-r5, sl, lr}
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#define NEG r5
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mov NEG, #0
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#ifdef __ARMEB__
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#define ALO r1 /* incoming numerator, outgoing quotient */
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#define AHI r0 /* incoming numerator, outgoing quotient */
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#define BLO r3 /* incoming denominator, outgoing remainder */
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#define BHI r2 /* incoming denominator, outgoing remainder */
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#else
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#define ALO r0 /* incoming numerator, outgoing quotient */
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#define AHI r1 /* incoming numerator, outgoing quotient */
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#define BLO r2 /* incoming denominator, outgoing remainder */
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#define BHI r3 /* incoming denominator, outgoing remainder */
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#endif
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cmp BHI, #0
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bge 2f
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eor NEG, NEG, #1 /* flip quotient sign */
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bl .Lnegate_b
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bcs .Lmaxdenom
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2:
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cmp AHI, #0
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/* bge 3f */
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eorlt NEG, NEG, #3 /* flip quotient sign, flip remainder sign */
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bllt .Lnegate_a
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3:
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/*
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* Arguments are setup, allocate some stack for the remainder
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* and call __qdivrem for the heavy lifting.
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*/
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sub sp, sp, #8
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mov r4, sp /* pointer to remainder */
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bl PLT_SYM(__qdivrem)
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teq NEG, #0 /* any signs to flip? */
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/*
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* The quotient is already in the right place and neither value
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* needs its sign flipped.
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*/
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popeq {r2-r5, sl, lr}
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RETc(eq)
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pop {r2, r3}
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tst NEG, #2 /* does remainder need to be negative? */
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bleq .Lnegate_b
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tst NEG, #1 /* does quotient need to be negative? */
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bleq .Lnegate_a
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pop {r4-r5, sl, lr}
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RET
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.Lnegate_a:
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rsbs ALO, ALO, #0
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rsc AHI, AHI, #0
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RET
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.Lnegate_b:
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rsbs BLO, BLO, #0
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rsc BHI, BHI, #0
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RET
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.Lmaxdenom:
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/*
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* We had a carry so the denominator must have INT64_MIN
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* Also BLO and BHI never changed values so we can use
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* them to see if the numerator has the same value. We
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* don't have to worry about sign.
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*/
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teq BHI, AHI
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teqeq BLO, ALO
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bne 1f
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/*
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* They were equal, so we return a quotient of 1 and remainder of 0.
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*/
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mov ALO, #1
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mov AHI, #0
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mov BLO, #0
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mov BHI, #0
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pop {r4-r5, sl, lr}
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RET
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/*
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* Our remainder must be the numerator and our quotient is 0.
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*/
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1: mov BLO, ALO
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mov BHI, AHI
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mov ALO, #0
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mov AHI, #0
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pop {r4-r5, sl, lr}
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RET
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END(__aeabi_ldivmod)
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