cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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muldi3.c (2698B)

      1/* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and 
      2			   gcc-2.7.2.3/longlong.h which is: */
      3/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
      4
      5This file is part of GNU CC.
      6
      7GNU CC is free software; you can redistribute it and/or modify
      8it under the terms of the GNU General Public License as published by
      9the Free Software Foundation; either version 2, or (at your option)
     10any later version.
     11
     12GNU CC is distributed in the hope that it will be useful,
     13but WITHOUT ANY WARRANTY; without even the implied warranty of
     14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15GNU General Public License for more details. */
     16
     17#include <linux/compiler.h>
     18#include <linux/export.h>
     19
     20#ifdef CONFIG_CPU_HAS_NO_MULDIV64
     21
     22#define SI_TYPE_SIZE 32
     23#define __BITS4 (SI_TYPE_SIZE / 4)
     24#define __ll_B (1L << (SI_TYPE_SIZE / 2))
     25#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
     26#define __ll_highpart(t) ((USItype) (t) / __ll_B)
     27
     28#define umul_ppmm(w1, w0, u, v)						\
     29  do {									\
     30    USItype __x0, __x1, __x2, __x3;					\
     31    USItype __ul, __vl, __uh, __vh;					\
     32									\
     33    __ul = __ll_lowpart (u);						\
     34    __uh = __ll_highpart (u);						\
     35    __vl = __ll_lowpart (v);						\
     36    __vh = __ll_highpart (v);						\
     37									\
     38    __x0 = (USItype) __ul * __vl;					\
     39    __x1 = (USItype) __ul * __vh;					\
     40    __x2 = (USItype) __uh * __vl;					\
     41    __x3 = (USItype) __uh * __vh;					\
     42									\
     43    __x1 += __ll_highpart (__x0);/* this can't give carry */		\
     44    __x1 += __x2;		/* but this indeed can */		\
     45    if (__x1 < __x2)		/* did we get it? */			\
     46      __x3 += __ll_B;		/* yes, add it in the proper pos. */	\
     47									\
     48    (w1) = __x3 + __ll_highpart (__x1);					\
     49    (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0);		\
     50  } while (0)
     51
     52#else
     53
     54#define umul_ppmm(w1, w0, u, v) \
     55  __asm__ ("mulu%.l %3,%1:%0"						\
     56           : "=d" ((USItype)(w0)),					\
     57             "=d" ((USItype)(w1))					\
     58           : "%0" ((USItype)(u)),					\
     59             "dmi" ((USItype)(v)))
     60
     61#endif
     62
     63#define __umulsidi3(u, v) \
     64  ({DIunion __w;							\
     65    umul_ppmm (__w.s.high, __w.s.low, u, v);				\
     66    __w.ll; })
     67
     68typedef 	 int SItype	__mode(SI);
     69typedef unsigned int USItype	__mode(SI);
     70typedef		 int DItype	__mode(DI);
     71typedef int word_type           __mode(__word__);
     72
     73struct DIstruct {SItype high, low;};
     74
     75typedef union
     76{
     77  struct DIstruct s;
     78  DItype ll;
     79} DIunion;
     80
     81DItype
     82__muldi3 (DItype u, DItype v)
     83{
     84  DIunion w;
     85  DIunion uu, vv;
     86
     87  uu.ll = u;
     88  vv.ll = v;
     89
     90  w.ll = __umulsidi3 (uu.s.low, vv.s.low);
     91  w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
     92	       + (USItype) uu.s.high * (USItype) vv.s.low);
     93
     94  return w.ll;
     95}
     96EXPORT_SYMBOL(__muldi3);