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linux: 32-bit compatibility with GCC versions before 7

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GCC version 7 and above generate calls to __divmoddi for 64bit integer
division on 32-bit. Unfortunately, libgcc liberaries of older compilers
lack this symbol and are still in use by Debian/Ubuntu LTS at least.
This commit is contained in:
Christian Helmuth 2019-05-21 17:13:24 +02:00
parent 96b29c6f8a
commit e60b597af5
2 changed files with 75 additions and 0 deletions
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2
repos/base-linux/lib/mk/lx_hybrid.mk
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@ -1,8 +1,10 @@
SRC_CC += lx_hybrid.cc new_delete.cc capability_space.cc
SRC_CC += signal_transmitter.cc signal.cc
SRC_C += libgcc.c
vpath new_delete.cc $(BASE_DIR)/src/lib/cxx
vpath lx_hybrid.cc $(REP_DIR)/src/lib/lx_hybrid
vpath libgcc.c $(REP_DIR)/src/lib/lx_hybrid
# add parts of the base library that are shared with core
LIBS += base-linux-common timeout

73
repos/base-linux/src/lib/lx_hybrid/libgcc.c Normal file
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@ -0,0 +1,73 @@
/*
* \brief libgcc contrib code for lx-hybrid components
* \author Christian Helmuth
* \date 2019-05-21
*
* GCC version 7 and above generate calls to __divmoddi for 64bit integer
* division on 32-bit. Unfortunately, libgcc liberaries of older compilers
* lack this symbol and are still in use by Debian/Ubuntu LTS at least.
*
* Implementation is similar to GCC 8.3 libgcc/libgcc2.c and libgcc/libgcc2.h -
* original license header follows.
*/
/* Copyright (C) 1989-2016 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef __i386__
typedef int SItype __attribute__ ((mode (SI)));
typedef int DItype __attribute__ ((mode (DI)));
typedef unsigned int UDItype __attribute__ ((mode (DI)));
typedef SItype Wtype;
typedef DItype DWtype;
typedef UDItype UDWtype;
struct DWstruct { Wtype low, high; };
typedef union { struct DWstruct s; DWtype ll; } DWunion;
extern UDWtype __udivmoddi4 (UDWtype, UDWtype, UDWtype *);
DWtype __divmoddi4 (DWtype u, DWtype v, DWtype *rp)
{
Wtype c1 = 0, c2 = 0;
DWunion uu = {.ll = u};
DWunion vv = {.ll = v};
DWtype w;
DWtype r;
if (uu.s.high < 0)
c1 = ~c1, c2 = ~c2,
uu.ll = -uu.ll;
if (vv.s.high < 0)
c1 = ~c1,
vv.ll = -vv.ll;
w = __udivmoddi4 (uu.ll, vv.ll, (UDWtype*)&r);
if (c1)
w = -w;
if (c2)
r = -r;
*rp = r;
return w;
}
#endif