diff options
Diffstat (limited to 'patches/glibc/2.3.5/glibc-fp-byteorder.patch')
| -rw-r--r-- | patches/glibc/2.3.5/glibc-fp-byteorder.patch | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/patches/glibc/2.3.5/glibc-fp-byteorder.patch b/patches/glibc/2.3.5/glibc-fp-byteorder.patch new file mode 100644 index 0000000..f20432e --- /dev/null +++ b/patches/glibc/2.3.5/glibc-fp-byteorder.patch @@ -0,0 +1,203 @@ +Taken from http://sources.redhat.com/ml/crossgcc/2004-02/msg00104.html +Author: addsub@eyou.com +Target: ARM + +Fixes http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/920501-8.c +and makes printf("%f", 1.0) work. + +Lennert Buytenhek wrote in http://sources.redhat.com/ml/crossgcc/2004-09/msg00115.html : + It ... fixes the 'printf("%f\n", 0.5); prints 0.000000' and general 'floating point + is broken' on my big-endian hardfloat FPA ARM platform. ... + It's definitely needed for hardfloat. So I'd think it's needed for + big-endian systems in any case, and for VFP on little-endian systems + too. Someone would have to verify that though. + +Lennert Buytenhek wrote in http://sources.redhat.com/ml/crossgcc/2004-09/msg00123.html + I just had a look at glibc-20040830, and [this patch] is still needed and useful + for this version. glibc-20040830 out-of-the-box still contains the + following wrong assumptions: + - sysdeps/arm/bits/endian.h: float word order is big endian (which it is + not on vfp systems) + - sysdeps/arm/gmp-mparam.h: IEEE doubles are mixed endian (which they + are not on big endian systems, neither on vfp systems) + - sysdeps/arm/ieee754.h: IEEE doubles are in little endian byte order + (which they are not on big endian systems) + [This patch] seems the right solution for all of these issues. + +Dimitry Andric wrote in http://sources.redhat.com/ml/crossgcc/2004-09/msg00132.html : + It's even needed for glibc CVS, AFAICS. + The patch hunk which modifies glibc.new/sysdeps/arm/bits/endian.h + (currently at version 1.4) is only needed for proper VFP operation. + But the hunk which modifies sysdeps/arm/gmp-mparam.h, and the hunk + that deletes sysdeps/arm/ieee754.h (yes, this IS correct), are needed + for proper operation of *any* FP model on big endian ARM. + +See also discussion in followups to +http://sources.redhat.com/ml/crossgcc/2004-05/msg00245.html) + +Message-ID: <276985760.37584@eyou.com> +Received: from unknown (HELO eyou.com) (172.16.2.2) + by 0.0.0.0 with SMTP; Tue, 17 Feb 2004 10:42:40 +0800 +Received: (qmail 8238 invoked by uid 65534); 17 Feb 2004 10:42:38 +0800 +Date: 17 Feb 2004 10:42:38 +0800 +Message-ID: <20040217104238.8237.qmail@eyou.com> +From: "add" <addsub@eyou.com> +To: dank@kegel.com +Reply-To: "add" <addsub@eyou.com> +Subject: Re: problem while building arm vfp softfloat gcc ` + +Hi, Dan, This is a patch I applied to my glibc-2.3.2, then my softfloat +toolchain can printf("%f\n",1.0). So you may have a try of this + + +diff -uNrp glibc.old/sysdeps/arm/bits/endian.h glibc.new/sysdeps/arm/bits/endian.h +--- glibc.old/sysdeps/arm/bits/endian.h 1999-04-12 11:59:13.000000000 -0400 ++++ glibc.new/sysdeps/arm/bits/endian.h 2004-02-12 09:15:13.000000000 -0500 +@@ -9,4 +9,9 @@ + #else + #define __BYTE_ORDER __LITTLE_ENDIAN + #endif ++ ++#ifdef __VFP_FP__ ++#define __FLOAT_WORD_ORDER __BYTE_ORDER ++#else + #define __FLOAT_WORD_ORDER __BIG_ENDIAN ++#endif +diff -uNrp glibc.old/sysdeps/arm/gmp-mparam.h glibc.new/sysdeps/arm/gmp-mparam.h +--- glibc.old/sysdeps/arm/gmp-mparam.h 2001-07-07 15:21:19.000000000 -0400 ++++ glibc.new/sysdeps/arm/gmp-mparam.h 2004-02-12 09:15:13.000000000 -0500 +@@ -26,5 +26,13 @@ MA 02111-1307, USA. */ + #define BITS_PER_SHORTINT 16 + #define BITS_PER_CHAR 8 + +-#define IEEE_DOUBLE_BIG_ENDIAN 0 +-#define IEEE_DOUBLE_MIXED_ENDIAN 1 ++#if defined(__ARMEB__) ++# define IEEE_DOUBLE_MIXED_ENDIAN 0 ++# define IEEE_DOUBLE_BIG_ENDIAN 1 ++#elif defined(__VFP_FP__) ++# define IEEE_DOUBLE_MIXED_ENDIAN 0 ++# define IEEE_DOUBLE_BIG_ENDIAN 0 ++#else ++# define IEEE_DOUBLE_BIG_ENDIAN 0 ++# define IEEE_DOUBLE_MIXED_ENDIAN 1 ++#endif +diff -uNrp glibc.old/sysdeps/arm/ieee754.h glibc.new/sysdeps/arm/ieee754.h +--- glibc.old/sysdeps/arm/ieee754.h 2001-07-07 15:21:19.000000000 -0400 ++++ glibc.new/sysdeps/arm/ieee754.h 1969-12-31 19:00:00.000000000 -0500 +@@ -1,115 +0,0 @@ +-/* Copyright (C) 1992, 1995, 1996, 1998 Free Software Foundation, Inc. +- This file is part of the GNU C Library. +- +- The GNU C Library is free software; you can redistribute it and/or +- modify it under the terms of the GNU Lesser General Public +- License as published by the Free Software Foundation; either +- version 2.1 of the License, or (at your option) any later version. +- +- The GNU C Library 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 +- Lesser General Public License for more details. +- +- You should have received a copy of the GNU Lesser General Public +- License along with the GNU C Library; if not, write to the Free +- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +- 02111-1307 USA. */ +- +-#ifndef _IEEE754_H +- +-#define _IEEE754_H 1 +-#include <features.h> +- +-#include <endian.h> +- +-__BEGIN_DECLS +- +-union ieee754_float +- { +- float f; +- +- /* This is the IEEE 754 single-precision format. */ +- struct +- { +- unsigned int mantissa:23; +- unsigned int exponent:8; +- unsigned int negative:1; +- } ieee; +- +- /* This format makes it easier to see if a NaN is a signalling NaN. */ +- struct +- { +- unsigned int mantissa:22; +- unsigned int quiet_nan:1; +- unsigned int exponent:8; +- unsigned int negative:1; +- } ieee_nan; +- }; +- +-#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ +- +- +-union ieee754_double +- { +- double d; +- +- /* This is the IEEE 754 double-precision format. */ +- struct +- { +- unsigned int mantissa0:20; +- unsigned int exponent:11; +- unsigned int negative:1; +- unsigned int mantissa1:32; +- } ieee; +- +- /* This format makes it easier to see if a NaN is a signalling NaN. */ +- struct +- { +- unsigned int mantissa0:19; +- unsigned int quiet_nan:1; +- unsigned int exponent:11; +- unsigned int negative:1; +- unsigned int mantissa1:32; +- } ieee_nan; +- }; +- +-#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ +- +- +-/* The following two structures are correct for `new' floating point systems but +- wrong for the old FPPC. The only solution seems to be to avoid their use on +- old hardware. */ +- +-union ieee854_long_double +- { +- long double d; +- +- /* This is the IEEE 854 double-extended-precision format. */ +- struct +- { +- unsigned int exponent:15; +- unsigned int empty:16; +- unsigned int negative:1; +- unsigned int mantissa1:32; +- unsigned int mantissa0:32; +- } ieee; +- +- /* This is for NaNs in the IEEE 854 double-extended-precision format. */ +- struct +- { +- unsigned int exponent:15; +- unsigned int empty:16; +- unsigned int negative:1; +- unsigned int mantissa1:32; +- unsigned int mantissa0:30; +- unsigned int quiet_nan:1; +- unsigned int one:1; +- } ieee_nan; +- }; +- +-#define IEEE854_LONG_DOUBLE_BIAS 0x3fff +- +-__END_DECLS +- +-#endif /* ieee754.h */ |