OpenE2K
/
glibc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

MIPS: IEEE 754-2008 NaN encoding support 

It has been a long practice for software using IEEE 754 floating-point
arithmetic run on MIPS processors to use an encoding of Not-a-Number
(NaN) data different to one used by software run on other processors.
And as of IEEE 754-2008 revision [1] this encoding does not follow one
recommended in the standard, as specified in section 6.2.1, where it
is stated that quiet NaNs should have the first bit (d1) of their
significand set to 1 while signalling NaNs should have that bit set to
0, but MIPS software interprets the two bits in the opposite manner.

As from revision 3.50 [2][3] the MIPS Architecture provides for
processors that support the IEEE 754-2008 preferred NaN encoding format.
As the two formats (further referred to as "legacy NaN" and "2008 NaN")
are incompatible to each other, tools have to provide support for the
two formats to help people avoid using incompatible binary modules.

The change is comprised of two functional groups of features, both of
which are required for correct support.

1. Dynamic linker support.

   To enforce the NaN encoding requirement in dynamic linking a new ELF
   file header flag has been defined.  This flag is set for 2008-NaN
   shared modules and executables and clear for legacy-NaN ones.  The
   dynamic linker silently ignores any incompatible modules it
   encounters in dependency processing.

   To avoid unnecessary processing of incompatible modules in the
   presence of a shared module cache, a set of new cache flags has been
   defined to mark 2008-NaN modules for the three ABIs supported.
   Changes to sysdeps/unix/sysv/linux/mips/readelflib.c have been made
   following an earlier code quality suggestion made here:

   http://sourceware.org/ml/libc-ports/2009-03/msg00036.html

   and are therefore a little bit more extensive than the minimum
   required.

   Finally a new name has been defined for the dynamic linker so that
   2008-NaN and legacy-NaN binaries can coexist on a single system that
   supports dual-mode operation and that a legacy dynamic linker that
   does not support verifying the 2008-NaN ELF file header flag is not
   chosen to interpret a 2008-NaN binary by accident.

2. Floating environment support.

   IEEE 754-2008 features are controlled in the Floating-Point Control
   and Status (FCSR) register and updates are needed to floating
   environment support so that the 2008-NaN flag is set correctly and
   the kernel default, inferred from the 2008-NaN ELF file header flag
   at the time an executable is loaded, respected.

As the NaN encoding format is a property of GCC code generation that is
both a user-selected GCC configuration default and can be overridden
with GCC options, code that needs to know what NaN encoding standard it
has been configured for checks for the __mips_nan2008 macro that is
defined internally by GCC whenever the 2008-NaN mode has been selected.
This mode is determined at the glibc configuration time and therefore a
few consistency checks have been added to catch cases where compilation
flags have been overridden by the user.

The 2008 NaN set of features relies on kernel support as the in-kernel
floating-point emulator needs to be aware of the NaN encoding used even
on hard-float processors and configure the FPU context according to the
value of the 2008 NaN ELF file header flag of the executable being
started.  As at this time work on kernel support is still in progress
and the relevant changes have not made their way yet to linux.org master
repository.

Therefore the minimum version supported has been artificially set to
10.0.0 so that 2008-NaN code is not accidentally run on a Linux kernel
that does not suppport it.  It is anticipated that the version is
adjusted later on to the actual initial linux.org kernel version to
support this feature.  Legacy NaN encoding support is unaffected, older
kernel versions remain supported.

[1] "IEEE Standard for Floating-Point Arithmetic", IEEE Computer
    Society, IEEE Std 754-2008, 29 August 2008

[2] "MIPS Architecture For Programmers, Volume I-A: Introduction to the
    MIPS32 Architecture", MIPS Technologies, Inc., Document Number:
    MD00082, Revision 3.50, September 20, 2012

[3] "MIPS Architecture For Programmers, Volume I-A: Introduction to the
    MIPS64 Architecture", MIPS Technologies, Inc., Document Number:
    MD00083, Revision 3.50, September 20, 2012
This commit is contained in:
Maciej W. Rozycki 2013-09-18 21:04:27 +01:00
parent 24d22e65b3
commit 9c21573c02
20 changed files with 685 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
ChangeLog
View File

@ -1,3 +1,12 @@
2013-09-18 Maciej W. Rozycki <macro@codesourcery.com>
* config.h.in (HAVE_MIPS_NAN2008): New macro.
* elf/elf.h (EF_MIPS_NAN2008): Likewise.
* sysdeps/generic/ldconfig.h (FLAG_MIPS_LIB32_NAN2008): Likewise.
(FLAG_MIPS64_LIBN32_NAN2008): Likewise.
(FLAG_MIPS64_LIBN64_NAN2008): Likewise.
* elf/cache.c (print_entry): Handle the new cache flags.
2013-09-18 Joseph Myers <joseph@codesourcery.com>
Aldy Hernandez <aldyh@redhat.com>

4
config.h.in
View File

@ -238,4 +238,8 @@
/* The pt_chown binary is being built and used by grantpt. */
#undef HAVE_PT_CHOWN
/* ports/sysdeps/mips/configure.in */
/* Define if using the IEEE 754-2008 NaN encoding on the MIPS target. */
#undef HAVE_MIPS_NAN2008
#endif

9
elf/cache.c
View File

@ -105,6 +105,15 @@ print_entry (const char *lib, int flag, unsigned int osversion,
case FLAG_ARM_LIBSF:
fputs (",soft-float", stdout);
break;
case FLAG_MIPS_LIB32_NAN2008:
fputs (",nan2008", stdout);
break;
case FLAG_MIPS64_LIBN32_NAN2008:
fputs (",N32,nan2008", stdout);
break;
case FLAG_MIPS64_LIBN64_NAN2008:
fputs (",64bit,nan2008", stdout);
break;
case 0:
break;
default:

1
elf/elf.h
View File

@ -1383,6 +1383,7 @@ typedef struct
#define EF_MIPS_64BIT_WHIRL 16
#define EF_MIPS_ABI2 32
#define EF_MIPS_ABI_ON32 64
#define EF_MIPS_NAN2008 1024 /* Uses IEEE 754-2008 NaN encoding. */
#define EF_MIPS_ARCH 0xf0000000 /* MIPS architecture level. */
/* Legal values for MIPS architecture level. */

68
ports/ChangeLog.mips
View File

@ -1,3 +1,71 @@
2013-09-18 Maciej W. Rozycki <macro@codesourcery.com>
Thomas Schwinge <thomas@codesourcery.com>
* sysdeps/mips/dl-machine.h (ELF_MACHINE_NAN2008): New macro.
(elf_machine_matches_host): Reject objects that use a different
NaN encoding convention.
* sysdeps/mips/fpu_control.h: Document IEEE 754-2008 feature
control bits.
(_FPU_ABS2008, _FPU_NAN2008): New macros.
(_FPU_RESERVED): Clear bits #20 and #19.
(_FPU_DEFAULT) [__mips_nan2008]: Set bit #18.
(_FPU_IEEE) [__mips_nan2008]: Likewise.
* sysdeps/mips/math_private.h [__mips_nan2008]
(HIGH_ORDER_BIT_IS_SET_FOR_SNAN): Don't define.
* sysdeps/mips/bits/nan.h [__mips_nan2008] (__qnan_bytes): Define
appropriately.
* sysdeps/mips/mips64/soft-fp/sfp-machine.h [__mips_nan2008]
(_FP_NANFRAC_S, _FP_NANFRAC_D, _FP_NANFRAC_Q): Define 2008-NaN
payloads.
(_FP_QNANNEGATEDP): Set to 0.
* sysdeps/mips/soft-fp/sfp-machine.h [__mips_nan2008]
(_FP_NANFRAC_S, _FP_NANFRAC_D, _FP_NANFRAC_Q): Define 2008-NaN
payloads.
(_FP_QNANNEGATEDP): Set to 0.
* sysdeps/unix/sysv/linux/mips/dl-cache.h (_DL_CACHE_DEFAULT_ID):
Define 2008 NaN encoding values.
* sysdeps/unix/sysv/linux/mips/readelflib.c (process_elf_file):
Handle 2008-NaN libraries.
* sysdeps/mips/shlib-versions [HAVE_MIPS_NAN2008]: Set
ld=ld-linux-mipsn8.so.1.
* sysdeps/mips/configure.in: Define HAVE_MIPS_NAN2008 if the
2008 NaN encoding is used.
* sysdeps/unix/sysv/linux/mips/Makefile (abi-variants): Add
2008-NaN ABI variants.
(abi-o32_soft-options, abi-o32_soft-condition): Update with the
__mips_nan2008 macro.
(abi-o32_hard-options, abi-o32_hard-condition): Likewise.
(abi-n32_soft-options, abi-n32_soft-condition): Likewise.
(abi-n32_hard-options, abi-n32_hard-condition): Likewise.
(abi-n64_soft-options, abi-n64_soft-condition): Likewise.
(abi-n64_hard-options, abi-n64_hard-condition): Likewise.
(abi-o32_soft-ld-soname, abi-o32_hard-ld-soname): New macros.
(abi-n32_soft-ld-soname, abi-n32_hard-ld-soname): Likewise.
(abi-n64_soft-ld-soname, abi-n64_hard-ld-soname): Likewise.
(abi-o32_soft_2008-options): Likewise.
(abi-o32_soft_2008-condition): Likewise.
(abi-o32_hard_2008-options): Likewise.
(abi-o32_hard_2008-condition): Likewise.
(abi-n32_soft_2008-options): Likewise.
(abi-n32_soft_2008-condition): Likewise.
(abi-n32_hard_2008-options): Likewise.
(abi-n32_hard_2008-condition): Likewise.
(abi-n64_soft_2008-options): Likewise.
(abi-n64_soft_2008-condition): Likewise.
(abi-n64_hard_2008-options): Likewise.
(abi-n64_hard_2008-condition): Likewise.
(abi-o32_soft_2008-ld-soname): Likewise.
(abi-o32_hard_2008-ld-soname): Likewise.
(abi-n32_soft_2008-ld-soname): Likewise.
(abi-n32_hard_2008-ld-soname): Likewise.
(abi-n64_soft_2008-ld-soname): Likewise.
(abi-n64_hard_2008-ld-soname): Likewise.
* sysdeps/unix/sysv/linux/mips/configure.in: Include the NaN
encoding selection in default-abi. Set arch_minimum_kernel to
10.0.0 if 2008 NaN encoding is used.
* sysdeps/mips/configure: Regenerate.
* sysdeps/unix/sysv/linux/mips/configure: Regenerate.
2013-08-30 Ondřej Bílka <neleai@seznam.cz>
* sysdeps/mips/memcpy.S: Fix then/than typos.

23
ports/sysdeps/mips/bits/nan.h
View File

@ -22,10 +22,11 @@
/* IEEE Not A Number. */
/* Note that MIPS has the qNaN and sNaN patterns reversed compared to most
other architectures. IEEE 754-1985 left the definition of this open to
implementations, and for MIPS the top bit of the mantissa must be SET to
indicate a sNaN. */
/* In legacy-NaN mode MIPS has the qNaN and sNaN patterns reversed
compared to most other architectures. IEEE 754-1985 left the
definition of this open to implementations, and for MIPS the top bit
of the mantissa must be SET to indicate a sNaN. In 2008-NaN mode
MIPS aligned to IEEE 754-2008. */
#if __GNUC_PREREQ(3,3)
@ -33,6 +34,8 @@
#elif defined __GNUC__
/* No 2008-NaN mode support in any GCC version before 4.9. */
# define NAN \
(__extension__ \
((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; }) \
@ -43,10 +46,18 @@
# include <endian.h>
# if __BYTE_ORDER == __BIG_ENDIAN
# define __qnan_bytes { 0x7f, 0xbf, 0xff, 0xff }
# ifdef __mips_nan2008
# define __qnan_bytes { 0x7f, 0xc0, 0, 0 }
# else
# define __qnan_bytes { 0x7f, 0xbf, 0xff, 0xff }
# endif
# endif
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define __qnan_bytes { 0xff, 0xff, 0xbf, 0x7f }
# ifdef __mips_nan2008
# define __qnan_bytes { 0, 0, 0xc0, 0x7f }
# else
# define __qnan_bytes { 0xff, 0xff, 0xbf, 0x7f }
# endif
# endif
static union { unsigned char __c[4]; float __d; } __qnan_union

160
ports/sysdeps/mips/configure vendored
View File

@ -1,3 +1,163 @@
# This file is generated from configure.in by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/mips.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
$as_echo_n "checking for grep that handles long lines and -e... " >&6; }
if ${ac_cv_path_GREP+:} false; then :
$as_echo_n "(cached) " >&6
else
if test -z "$GREP"; then
ac_path_GREP_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_prog in grep ggrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
{ test -f "$ac_path_GREP" && $as_test_x "$ac_path_GREP"; } || continue
# Check for GNU ac_path_GREP and select it if it is found.
# Check for GNU $ac_path_GREP
case `"$ac_path_GREP" --version 2>&1` in
*GNU*)
ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;;
*)
ac_count=0
$as_echo_n 0123456789 >"conftest.in"
while :
do
cat "conftest.in" "conftest.in" >"conftest.tmp"
mv "conftest.tmp" "conftest.in"
cp "conftest.in" "conftest.nl"
$as_echo 'GREP' >> "conftest.nl"
"$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break
diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
as_fn_arith $ac_count + 1 && ac_count=$as_val
if test $ac_count -gt ${ac_path_GREP_max-0}; then
# Best one so far, save it but keep looking for a better one
ac_cv_path_GREP="$ac_path_GREP"
ac_path_GREP_max=$ac_count
fi
# 10*(2^10) chars as input seems more than enough
test $ac_count -gt 10 && break
done
rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
esac
$ac_path_GREP_found && break 3
done
done
done
IFS=$as_save_IFS
if test -z "$ac_cv_path_GREP"; then
as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
fi
else
ac_cv_path_GREP=$GREP
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
$as_echo "$ac_cv_path_GREP" >&6; }
GREP="$ac_cv_path_GREP"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
$as_echo_n "checking for egrep... " >&6; }
if ${ac_cv_path_EGREP+:} false; then :
$as_echo_n "(cached) " >&6
else
if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
then ac_cv_path_EGREP="$GREP -E"
else
if test -z "$EGREP"; then
ac_path_EGREP_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_prog in egrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
{ test -f "$ac_path_EGREP" && $as_test_x "$ac_path_EGREP"; } || continue
# Check for GNU ac_path_EGREP and select it if it is found.
# Check for GNU $ac_path_EGREP
case `"$ac_path_EGREP" --version 2>&1` in
*GNU*)
ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;;
*)
ac_count=0
$as_echo_n 0123456789 >"conftest.in"
while :
do
cat "conftest.in" "conftest.in" >"conftest.tmp"
mv "conftest.tmp" "conftest.in"
cp "conftest.in" "conftest.nl"
$as_echo 'EGREP' >> "conftest.nl"
"$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break
diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
as_fn_arith $ac_count + 1 && ac_count=$as_val
if test $ac_count -gt ${ac_path_EGREP_max-0}; then
# Best one so far, save it but keep looking for a better one
ac_cv_path_EGREP="$ac_path_EGREP"
ac_path_EGREP_max=$ac_count
fi
# 10*(2^10) chars as input seems more than enough
test $ac_count -gt 10 && break
done
rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
esac
$ac_path_EGREP_found && break 3
done
done
done
IFS=$as_save_IFS
if test -z "$ac_cv_path_EGREP"; then
as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
fi
else
ac_cv_path_EGREP=$EGREP
fi
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
$as_echo "$ac_cv_path_EGREP" >&6; }
EGREP="$ac_cv_path_EGREP"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler is using the 2008 NaN encoding" >&5
$as_echo_n "checking whether the compiler is using the 2008 NaN encoding... " >&6; }
if ${libc_cv_mips_nan2008+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
dnl
#ifdef __mips_nan2008
yes
#endif
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP "yes" >/dev/null 2>&1; then :
libc_cv_mips_nan2008=yes
else
libc_cv_mips_nan2008=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mips_nan2008" >&5
$as_echo "$libc_cv_mips_nan2008" >&6; }
if test x$libc_cv_mips_nan2008 = xyes; then
$as_echo "#define HAVE_MIPS_NAN2008 1" >>confdefs.h
fi

9
ports/sysdeps/mips/configure.in
View File

@ -4,3 +4,12 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
dnl No MIPS GCC supports accessing static and hidden symbols in an
dnl position independent way.
dnl AC_DEFINE(PI_STATIC_AND_HIDDEN)
AC_CACHE_CHECK([whether the compiler is using the 2008 NaN encoding],
libc_cv_mips_nan2008, [AC_EGREP_CPP(yes, [dnl
#ifdef __mips_nan2008
yes
#endif], libc_cv_mips_nan2008=yes, libc_cv_mips_nan2008=no)])
if test x$libc_cv_mips_nan2008 = xyes; then
AC_DEFINE(HAVE_MIPS_NAN2008)
fi

14
ports/sysdeps/mips/dl-machine.h
View File

@ -73,6 +73,16 @@ do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
(ElfW(Addr)) (r); \
} while (0)
#if ((defined __mips_nan2008 && !defined HAVE_MIPS_NAN2008) \
|| (!defined __mips_nan2008 && defined HAVE_MIPS_NAN2008))
# error "Configuration inconsistency: __mips_nan2008 != HAVE_MIPS_NAN2008, overridden CFLAGS?"
#endif
#ifdef __mips_nan2008
# define ELF_MACHINE_NAN2008 EF_MIPS_NAN2008
#else
# define ELF_MACHINE_NAN2008 0
#endif
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int __attribute_used__
elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
@ -83,6 +93,10 @@ elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
return 0;
#endif
/* Don't link 2008-NaN and legacy-NaN objects together. */
if ((ehdr->e_flags & EF_MIPS_NAN2008) != ELF_MACHINE_NAN2008)
return 0;
switch (ehdr->e_machine)
{
case EM_MIPS:

25
ports/sysdeps/mips/fpu_control.h
View File

@ -29,7 +29,9 @@
* available for MIPS III and newer.
* 23 -> Condition bit
* 22-21 -> reserved for architecture implementers
* 20-18 -> reserved (read as 0, write with 0)
* 20 -> reserved (read as 0, write with 0)
* 19 -> IEEE 754-2008 non-arithmetic ABS.fmt and NEG.fmt enable
* 18 -> IEEE 754-2008 recommended NaN encoding enable
* 17 -> cause bit for unimplemented operation
* 16 -> cause bit for invalid exception
* 15 -> cause bit for division by zero exception
@ -79,22 +81,33 @@ extern fpu_control_t __fpu_control;
/* flush denormalized numbers to zero */
#define _FPU_FLUSH_TZ 0x1000000
/* IEEE 754-2008 compliance control. */
#define _FPU_ABS2008 0x80000
#define _FPU_NAN2008 0x40000
/* rounding control */
#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
#define _FPU_RC_ZERO 0x1
#define _FPU_RC_UP 0x2
#define _FPU_RC_DOWN 0x3
#define _FPU_RESERVED 0xfe9c0000 /* Reserved bits in cw */
#define _FPU_RESERVED 0xfe840000 /* Reserved bits in cw, incl NAN2008. */
/* The fdlibm code requires strict IEEE double precision arithmetic,
and no interrupts for exceptions, rounding to nearest. */
#ifdef __mips_nan2008
# define _FPU_DEFAULT 0x00040000
#else
# define _FPU_DEFAULT 0x00000000
#endif
#define _FPU_DEFAULT 0x00000000
/* IEEE: same as above, but exceptions */
#define _FPU_IEEE 0x00000F80
/* IEEE: same as above, but exceptions. */
#ifdef __mips_nan2008
# define _FPU_IEEE 0x00040F80
#else
# define _FPU_IEEE 0x00000F80
#endif
/* Type of the control word. */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));

6
ports/sysdeps/mips/math_private.h
View File

@ -18,9 +18,13 @@
#ifndef _MATH_PRIVATE_H
#ifdef __mips_nan2008
/* MIPS aligned to IEEE 754-2008. */
#else
/* One of the few architectures where the meaning of the quiet/signaling bit is
inverse to IEEE 754-2008 (as well as common practice for IEEE 754-1985). */
#define HIGH_ORDER_BIT_IS_SET_FOR_SNAN
# define HIGH_ORDER_BIT_IS_SET_FOR_SNAN
#endif
#include_next <math_private.h>

18
ports/sysdeps/mips/mips64/soft-fp/sfp-machine.h
View File

@ -24,15 +24,25 @@
#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_1_udiv_norm(D,R,X,Y)
#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
#define _FP_NANFRAC_S (_FP_QNANBIT_S - 1)
#define _FP_NANFRAC_D (_FP_QNANBIT_D - 1)
#define _FP_NANFRAC_Q (_FP_QNANBIT_Q - 1), -1
#ifdef __mips_nan2008
# define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
# define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1)
# define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1
#else
# define _FP_NANFRAC_S (_FP_QNANBIT_S - 1)
# define _FP_NANFRAC_D (_FP_QNANBIT_D - 1)
# define _FP_NANFRAC_Q (_FP_QNANBIT_Q - 1), -1
#endif
#define _FP_NANSIGN_S 0
#define _FP_NANSIGN_D 0
#define _FP_NANSIGN_Q 0
#define _FP_KEEPNANFRACP 1
#define _FP_QNANNEGATEDP 1
#ifdef __mips_nan2008
# define _FP_QNANNEGATEDP 0
#else
# define _FP_QNANNEGATEDP 1
#endif
/* From my experiments it seems X is chosen unless one of the
NaNs is sNaN, in which case the result is NANSIGN/NANFRAC. */

4
ports/sysdeps/mips/shlib-versions
View File

@ -3,7 +3,11 @@ mips.*-.*-linux.* libm=6 GLIBC_2.0 GLIBC_2.2
# Working mips versions were never released between 2.0 and 2.2.
mips.*-.*-linux.* libc=6 GLIBC_2.0 GLIBC_2.2
%ifdef HAVE_MIPS_NAN2008
mips.*-.*-linux.* ld=ld-linux-mipsn8.so.1 GLIBC_2.0 GLIBC_2.2
%else
mips.*-.*-linux.* ld=ld.so.1 GLIBC_2.0 GLIBC_2.2
%endif
mips.*-.*-linux.* libdl=2 GLIBC_2.0 GLIBC_2.2
mips.*-.*-linux.* libresolv=2 GLIBC_2.0 GLIBC_2.2

18
ports/sysdeps/mips/soft-fp/sfp-machine.h
View File

@ -21,15 +21,25 @@
#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
#define _FP_NANFRAC_S (_FP_QNANBIT_S - 1)
#define _FP_NANFRAC_D (_FP_QNANBIT_D - 1), -1
#define _FP_NANFRAC_Q (_FP_QNANBIT_Q - 1), -1, -1, -1
#ifdef __mips_nan2008
# define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
# define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
# define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
#else
# define _FP_NANFRAC_S (_FP_QNANBIT_S - 1)
# define _FP_NANFRAC_D (_FP_QNANBIT_D - 1), -1
# define _FP_NANFRAC_Q (_FP_QNANBIT_Q - 1), -1, -1, -1
#endif
#define _FP_NANSIGN_S 0
#define _FP_NANSIGN_D 0
#define _FP_NANSIGN_Q 0
#define _FP_KEEPNANFRACP 1
#define _FP_QNANNEGATEDP 1
#ifdef __mips_nan2008
# define _FP_QNANNEGATEDP 0
#else
# define _FP_QNANNEGATEDP 1
#endif
/* From my experiments it seems X is chosen unless one of the
NaNs is sNaN, in which case the result is NANSIGN/NANFRAC. */

92
ports/sysdeps/unix/sysv/linux/mips/Makefile
View File

@ -8,7 +8,9 @@ sysdep_routines += cachectl cacheflush sysmips _test_and_set
sysdep_headers += sys/cachectl.h sys/sysmips.h sys/tas.h
endif
abi-variants := o32_soft o32_hard n32_soft n32_hard n64_soft n64_hard
abi-variants := o32_soft o32_hard o32_soft_2008 o32_hard_2008
abi-variants += n32_soft n32_hard n32_soft_2008 n32_hard_2008
abi-variants += n64_soft n64_hard n64_soft_2008 n64_hard_2008
ifeq (,$(filter $(default-abi),$(abi-variants)))
Unknown ABI, must be one of $(abi-variants)
@ -18,29 +20,89 @@ abi-includes := sgidefs.h
# _MIPS_SIM_ABI32 == 1, _MIPS_SIM_NABI32 == 2, _MIPS_SIM_ABI64 == 3
abi-o32_soft-options := -U_MIPS_SIM -D_MIPS_SIM=1 \
-D__mips_soft_float -U__mips_hard_float
abi-o32_soft-condition := defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI32)
abi-o32_hard-options := -U_MIPS_SIM -D_MIPS_SIM=1 \
-D__mips_hard_float -U__mips_soft_float
abi-o32_hard-condition := defined(__mips_hard_float) \
-D__mips_soft_float -U__mips_hard_float \
-U__mips_nan2008
abi-o32_soft-condition := !defined(__mips_nan2008) \
&& defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI32)
abi-o32_soft-ld-soname := ld.so.1
abi-o32_hard-options := -U_MIPS_SIM -D_MIPS_SIM=1 \
-D__mips_hard_float -U__mips_soft_float \
-U__mips_nan2008
abi-o32_hard-condition := !defined(__mips_nan2008) \
&& defined(__mips_hard_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI32)
abi-o32_hard-ld-soname := ld.so.1
abi-o32_soft_2008-options := -U_MIPS_SIM -D_MIPS_SIM=1 \
-D__mips_soft_float -U__mips_hard_float \
-D__mips_nan2008
abi-o32_soft_2008-condition := defined(__mips_nan2008) \
&& defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI32)
abi-o32_soft_2008-ld-soname := ld-linux-mipsn8.so.1
abi-o32_hard_2008-options := -U_MIPS_SIM -D_MIPS_SIM=1 \
-D__mips_hard_float -U__mips_soft_float \
-D__mips_nan2008
abi-o32_hard_2008-condition := defined(__mips_nan2008) \
&& defined(__mips_hard_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI32)
abi-o32_hard_2008-ld-soname := ld-linux-mipsn8.so.1
abi-n32_soft-options := -U_MIPS_SIM -D_MIPS_SIM=2 \
-D__mips_soft_float -U__mips_hard_float
abi-n32_soft-condition := defined(__mips_soft_float) \
-D__mips_soft_float -U__mips_hard_float \
-U__mips_nan2008
abi-n32_soft-condition := !defined(__mips_nan2008) \
&& defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_NABI32)
abi-n32_soft-ld-soname := ld.so.1
abi-n32_hard-options := -U_MIPS_SIM -D_MIPS_SIM=2 \
-D__mips_hard_float -U__mips_soft_float
abi-n32_hard-condition := defined(__mips_hard_float) \
-D__mips_hard_float -U__mips_soft_float \
-U__mips_nan2008
abi-n32_hard-condition := !defined(__mips_nan2008) \
&& defined(__mips_hard_float) \
&& (_MIPS_SIM == _MIPS_SIM_NABI32)
abi-n32_hard-ld-soname := ld.so.1
abi-n32_soft_2008-options := -U_MIPS_SIM -D_MIPS_SIM=2 \
-D__mips_soft_float -U__mips_hard_float \
-D__mips_nan2008
abi-n32_soft_2008-condition := defined(__mips_nan2008) \
&& defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_NABI32)
abi-n32_soft_2008-ld-soname := ld-linux-mipsn8.so.1
abi-n32_hard_2008-options := -U_MIPS_SIM -D_MIPS_SIM=2 \
-D__mips_hard_float -U__mips_soft_float \
-D__mips_nan2008
abi-n32_hard_2008-condition := defined(__mips_nan2008) \
&& defined(__mips_hard_float) \
&& (_MIPS_SIM == _MIPS_SIM_NABI32)
abi-n32_hard_2008-ld-soname := ld-linux-mipsn8.so.1
abi-n64_soft-options := -U_MIPS_SIM -D_MIPS_SIM=3 \
-D__mips_soft_float -U__mips_hard_float
abi-n64_soft-condition := defined(__mips_soft_float) \
-D__mips_soft_float -U__mips_hard_float \
-U__mips_nan2008
abi-n64_soft-condition := !defined(__mips_nan2008) \
&& defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI64)
abi-n64_soft-ld-soname := ld.so.1
abi-n64_hard-options := -U_MIPS_SIM -D_MIPS_SIM=3 \
-D__mips_hard_float -U__mips_soft_float
abi-n64_hard-condition := defined(__mips_hard_float) \
-D__mips_hard_float -U__mips_soft_float \
-U__mips_nan2008
abi-n64_hard-condition := !defined(__mips_nan2008) \
&& defined(__mips_hard_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI64)
abi-n64_hard-ld-soname := ld.so.1
abi-n64_soft_2008-options := -U_MIPS_SIM -D_MIPS_SIM=3 \
-D__mips_soft_float -U__mips_hard_float \
-D__mips_nan2008
abi-n64_soft_2008-condition := defined(__mips_nan2008) \
&& defined(__mips_soft_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI64)
abi-n64_soft_2008-ld-soname := ld-linux-mipsn8.so.1
abi-n64_hard_2008-options := -U_MIPS_SIM -D_MIPS_SIM=3 \
-D__mips_hard_float -U__mips_soft_float \
-D__mips_nan2008
abi-n64_hard_2008-condition := defined(__mips_nan2008) \
&& defined(__mips_hard_float) \
&& (_MIPS_SIM == _MIPS_SIM_ABI64)
abi-n64_hard_2008-ld-soname := ld-linux-mipsn8.so.1
ifeq ($(subdir),elf)
ifeq ($(build-shared),yes)

171
ports/sysdeps/unix/sysv/linux/mips/configure vendored
View File

@ -105,8 +105,168 @@ if test -z "$libc_mips_float"; then
as_fn_error $? "could not determine if compiler is using hard or soft floating point ABI" "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
$as_echo_n "checking for grep that handles long lines and -e... " >&6; }
if ${ac_cv_path_GREP+:} false; then :
$as_echo_n "(cached) " >&6
else
if test -z "$GREP"; then
ac_path_GREP_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_prog in grep ggrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
{ test -f "$ac_path_GREP" && $as_test_x "$ac_path_GREP"; } || continue
# Check for GNU ac_path_GREP and select it if it is found.
# Check for GNU $ac_path_GREP
case `"$ac_path_GREP" --version 2>&1` in
*GNU*)
ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;;
*)
ac_count=0
$as_echo_n 0123456789 >"conftest.in"
while :
do
cat "conftest.in" "conftest.in" >"conftest.tmp"
mv "conftest.tmp" "conftest.in"
cp "conftest.in" "conftest.nl"
$as_echo 'GREP' >> "conftest.nl"
"$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break
diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
as_fn_arith $ac_count + 1 && ac_count=$as_val
if test $ac_count -gt ${ac_path_GREP_max-0}; then
# Best one so far, save it but keep looking for a better one
ac_cv_path_GREP="$ac_path_GREP"
ac_path_GREP_max=$ac_count
fi
# 10*(2^10) chars as input seems more than enough
test $ac_count -gt 10 && break
done
rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
esac
$ac_path_GREP_found && break 3
done
done
done
IFS=$as_save_IFS
if test -z "$ac_cv_path_GREP"; then
as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
fi
else
ac_cv_path_GREP=$GREP
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
$as_echo "$ac_cv_path_GREP" >&6; }
GREP="$ac_cv_path_GREP"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
$as_echo_n "checking for egrep... " >&6; }
if ${ac_cv_path_EGREP+:} false; then :
$as_echo_n "(cached) " >&6
else
if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
then ac_cv_path_EGREP="$GREP -E"
else
if test -z "$EGREP"; then
ac_path_EGREP_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_prog in egrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
{ test -f "$ac_path_EGREP" && $as_test_x "$ac_path_EGREP"; } || continue
# Check for GNU ac_path_EGREP and select it if it is found.
# Check for GNU $ac_path_EGREP
case `"$ac_path_EGREP" --version 2>&1` in
*GNU*)
ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;;
*)
ac_count=0
$as_echo_n 0123456789 >"conftest.in"
while :
do
cat "conftest.in" "conftest.in" >"conftest.tmp"
mv "conftest.tmp" "conftest.in"
cp "conftest.in" "conftest.nl"
$as_echo 'EGREP' >> "conftest.nl"
"$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break
diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
as_fn_arith $ac_count + 1 && ac_count=$as_val
if test $ac_count -gt ${ac_path_EGREP_max-0}; then
# Best one so far, save it but keep looking for a better one
ac_cv_path_EGREP="$ac_path_EGREP"
ac_path_EGREP_max=$ac_count
fi
# 10*(2^10) chars as input seems more than enough
test $ac_count -gt 10 && break
done
rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
esac
$ac_path_EGREP_found && break 3
done
done
done
IFS=$as_save_IFS
if test -z "$ac_cv_path_EGREP"; then
as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
fi
else
ac_cv_path_EGREP=$EGREP
fi
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
$as_echo "$ac_cv_path_EGREP" >&6; }
EGREP="$ac_cv_path_EGREP"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler is using the 2008 NaN encoding" >&5
$as_echo_n "checking whether the compiler is using the 2008 NaN encoding... " >&6; }
if ${libc_cv_mips_nan2008+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
dnl
#ifdef __mips_nan2008
yes
#endif
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP "yes" >/dev/null 2>&1; then :
libc_cv_mips_nan2008=yes
else
libc_cv_mips_nan2008=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mips_nan2008" >&5
$as_echo "$libc_cv_mips_nan2008" >&6; }
libc_mips_nan=
if test x"$libc_cv_mips_nan2008" = xyes; then
libc_mips_nan=_2008
fi
config_vars="$config_vars
default-abi = ${libc_mips_abi}_${libc_mips_float}"
default-abi = ${libc_mips_abi}_${libc_mips_float}${libc_mips_nan}"
case "$prefix" in
/usr | /usr/)
@ -138,3 +298,12 @@ case "$prefix" in
esac
libc_cv_gcc_unwind_find_fde=yes
if test -z "$arch_minimum_kernel"; then
if test x$libc_cv_mips_nan2008 = xyes; then
# FIXME: Adjust this setting to the actual first upstream kernel
# version to support the 2008 NaN encoding and then remove this
# comment.
arch_minimum_kernel=10.0.0
fi
fi

23
ports/sysdeps/unix/sysv/linux/mips/configure.in
View File

@ -44,7 +44,19 @@ if test -z "$libc_mips_float"; then
AC_MSG_ERROR([could not determine if compiler is using hard or soft floating point ABI])
fi
LIBC_CONFIG_VAR([default-abi], [${libc_mips_abi}_${libc_mips_float}])
AC_CACHE_CHECK([whether the compiler is using the 2008 NaN encoding],
libc_cv_mips_nan2008, [AC_EGREP_CPP(yes, [dnl
#ifdef __mips_nan2008
yes
#endif], libc_cv_mips_nan2008=yes, libc_cv_mips_nan2008=no)])
libc_mips_nan=
if test x"$libc_cv_mips_nan2008" = xyes; then
libc_mips_nan=_2008
fi
LIBC_CONFIG_VAR([default-abi],
[${libc_mips_abi}_${libc_mips_float}${libc_mips_nan}])
case "$prefix" in
/usr | /usr/)
@ -76,3 +88,12 @@ case "$prefix" in
esac
libc_cv_gcc_unwind_find_fde=yes
if test -z "$arch_minimum_kernel"; then
if test x$libc_cv_mips_nan2008 = xyes; then
# FIXME: Adjust this setting to the actual first upstream kernel
# version to support the 2008 NaN encoding and then remove this
# comment.
arch_minimum_kernel=10.0.0
fi
fi

26
ports/sysdeps/unix/sysv/linux/mips/dl-cache.h
View File

@ -18,11 +18,27 @@
#include <ldconfig.h>
/* Redefine the cache ID for new ABIs; o32 keeps using the generic check. */
#if _MIPS_SIM == _ABI64
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS64_LIBN64 | FLAG_ELF_LIBC6)
#elif _MIPS_SIM == _ABIN32
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS64_LIBN32 | FLAG_ELF_LIBC6)
#if ((defined __mips_nan2008 && !defined HAVE_MIPS_NAN2008) \
|| (!defined __mips_nan2008 && defined HAVE_MIPS_NAN2008))
# error "Configuration inconsistency: __mips_nan2008 != HAVE_MIPS_NAN2008, overridden CFLAGS?"
#endif
/* Redefine the cache ID for new ABIs and 2008 NaN support; legacy o32
keeps using the generic check. */
#ifdef __mips_nan2008
# if _MIPS_SIM == _ABIO32
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS_LIB32_NAN2008 | FLAG_ELF_LIBC6)
# elif _MIPS_SIM == _ABI64
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS64_LIBN64_NAN2008 | FLAG_ELF_LIBC6)
# elif _MIPS_SIM == _ABIN32
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS64_LIBN32_NAN2008 | FLAG_ELF_LIBC6)
# endif
#else
# if _MIPS_SIM == _ABI64
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS64_LIBN64 | FLAG_ELF_LIBC6)
# elif _MIPS_SIM == _ABIN32
# define _DL_CACHE_DEFAULT_ID (FLAG_MIPS64_LIBN32 | FLAG_ELF_LIBC6)
# endif
#endif
#ifdef _DL_CACHE_DEFAULT_ID

35
ports/sysdeps/unix/sysv/linux/mips/readelflib.c
View File

@ -33,19 +33,32 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname, void *file_contents,
size_t file_length)
{
ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
union
{
Elf64_Ehdr *eh64;
Elf32_Ehdr *eh32;
ElfW(Ehdr) *eh;
}
elf_header;
int ret;
if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
elf_header.eh = file_contents;
if (elf_header.eh->e_ident [EI_CLASS] == ELFCLASS32)
{
Elf32_Ehdr *elf32_header = (Elf32_Ehdr *) elf_header;
ret = process_elf32_file (file_name, lib, flag, osversion, soname,
file_contents, file_length);
if (!ret)
{
Elf32_Word flags = elf_header.eh32->e_flags;
int nan2008 = (flags & EF_MIPS_NAN2008) != 0;
/* n32 libraries are always libc.so.6+. */
if (!ret && (elf32_header->e_flags & EF_MIPS_ABI2) != 0)
*flag = FLAG_MIPS64_LIBN32|FLAG_ELF_LIBC6;
/* n32 libraries are always libc.so.6+, o32 only if 2008 NaN. */
if ((flags & EF_MIPS_ABI2) != 0)
*flag = (nan2008 ? FLAG_MIPS64_LIBN32_NAN2008
: FLAG_MIPS64_LIBN32) | FLAG_ELF_LIBC6;
else if (nan2008)
*flag = FLAG_MIPS_LIB32_NAN2008 | FLAG_ELF_LIBC6;
}
}
else
{
@ -53,7 +66,13 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
file_contents, file_length);
/* n64 libraries are always libc.so.6+. */
if (!ret)
*flag = FLAG_MIPS64_LIBN64|FLAG_ELF_LIBC6;
{
Elf64_Word flags = elf_header.eh64->e_flags;
int nan2008 = (flags & EF_MIPS_NAN2008) != 0;
*flag = (nan2008 ? FLAG_MIPS64_LIBN64_NAN2008
: FLAG_MIPS64_LIBN64) | FLAG_ELF_LIBC6;
}
}
return ret;

39
sysdeps/generic/ldconfig.h
View File

@ -21,24 +21,27 @@
#include <stdint.h>
#define FLAG_ANY -1
#define FLAG_TYPE_MASK 0x00ff
#define FLAG_LIBC4 0x0000
#define FLAG_ELF 0x0001
#define FLAG_ELF_LIBC5 0x0002
#define FLAG_ELF_LIBC6 0x0003
#define FLAG_REQUIRED_MASK 0xff00
#define FLAG_SPARC_LIB64 0x0100
#define FLAG_IA64_LIB64 0x0200
#define FLAG_X8664_LIB64 0x0300
#define FLAG_S390_LIB64 0x0400
#define FLAG_POWERPC_LIB64 0x0500
#define FLAG_MIPS64_LIBN32 0x0600
#define FLAG_MIPS64_LIBN64 0x0700
#define FLAG_X8664_LIBX32 0x0800
#define FLAG_ARM_LIBHF 0x0900
#define FLAG_AARCH64_LIB64 0x0a00
#define FLAG_ARM_LIBSF 0x0b00
#define FLAG_ANY -1
#define FLAG_TYPE_MASK 0x00ff
#define FLAG_LIBC4 0x0000
#define FLAG_ELF 0x0001
#define FLAG_ELF_LIBC5 0x0002
#define FLAG_ELF_LIBC6 0x0003
#define FLAG_REQUIRED_MASK 0xff00
#define FLAG_SPARC_LIB64 0x0100
#define FLAG_IA64_LIB64 0x0200
#define FLAG_X8664_LIB64 0x0300
#define FLAG_S390_LIB64 0x0400
#define FLAG_POWERPC_LIB64 0x0500
#define FLAG_MIPS64_LIBN32 0x0600
#define FLAG_MIPS64_LIBN64 0x0700
#define FLAG_X8664_LIBX32 0x0800
#define FLAG_ARM_LIBHF 0x0900
#define FLAG_AARCH64_LIB64 0x0a00
#define FLAG_ARM_LIBSF 0x0b00
#define FLAG_MIPS_LIB32_NAN2008 0x0c00
#define FLAG_MIPS64_LIBN32_NAN2008 0x0d00
#define FLAG_MIPS64_LIBN64_NAN2008 0x0e00
/* Name of auxiliary cache. */
#define _PATH_LDCONFIG_AUX_CACHE "/var/cache/ldconfig/aux-cache"