5f48d8fc26
true on amd64 I'm not quite positive this is the "correct" solution for this but it does seem to compile and shut up the spew of warnings when compiling libstand for userboot. Add two _Static_asserts() so that in the future somebody will get a compile failure if an architecture develops that violates the assumptions of this code. (strongly suggested by jmg) Change commetns to indicate int types instead of long. (noted by ian in phabric review) Phabric: https://phabric.freebsd.org/D443
115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)quad.h 8.1 (Berkeley) 6/4/93
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* $FreeBSD$
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*/
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/*
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* Quad arithmetic.
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*
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* This library makes the following assumptions:
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*
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* - The type long long (aka quad_t) exists.
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*
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* - A quad variable is exactly twice as long as `long'.
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*
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* - The machine's arithmetic is two's complement.
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*
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* This library can provide 128-bit arithmetic on a machine with 128-bit
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* quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
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* with 48-bit longs.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <limits.h>
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_Static_assert(sizeof(quad_t) == sizeof(int) * 2,
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"Bitwise function in libstand are broken on this architecture\n");
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/*
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* Depending on the desired operation, we view a `long long' (aka quad_t) in
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* one or more of the following formats.
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*/
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union uu {
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quad_t q; /* as a (signed) quad */
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quad_t uq; /* as an unsigned quad */
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int sl[2]; /* as two signed ints */
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u_int ul[2]; /* as two unsigned ints */
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};
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/*
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* Define high and low longwords.
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*/
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#define H _QUAD_HIGHWORD
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#define L _QUAD_LOWWORD
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/*
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* Total number of bits in a quad_t and in the pieces that make it up.
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* These are used for shifting, and also below for halfword extraction
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* and assembly.
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*/
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#define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
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#define HALF_BITS (sizeof(int) * CHAR_BIT / 2)
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/*
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* Extract high and low shortwords from longword, and move low shortword of
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* longword to upper half of long, i.e., produce the upper longword of
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* ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
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*
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* These are used in the multiply code, to split a longword into upper
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* and lower halves, and to reassemble a product as a quad_t, shifted left
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* (sizeof(long)*CHAR_BIT/2).
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*/
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#define HHALF(x) ((x) >> HALF_BITS)
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#define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
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#define LHUP(x) ((x) << HALF_BITS)
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quad_t __divdi3(quad_t a, quad_t b);
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quad_t __moddi3(quad_t a, quad_t b);
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u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
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u_quad_t __udivdi3(u_quad_t a, u_quad_t b);
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u_quad_t __umoddi3(u_quad_t a, u_quad_t b);
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/*
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* XXX
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* Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
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* as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
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* both compilers.
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*/
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#if __GNUC__ >= 2
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typedef unsigned int qshift_t;
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#else
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typedef u_quad_t qshift_t;
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#endif
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