2016-01-04 16:05:18 +00:00
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/* Copyright (C) 1999-2016 Free Software Foundation, Inc.
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1999-12-04 08:00:00 +00:00
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:58:11 +00:00
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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1999-12-04 08:00:00 +00:00
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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1999-12-04 08:00:00 +00:00
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2001-07-06 04:58:11 +00:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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1999-12-04 08:00:00 +00:00
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#ifndef _LDCONFIG_H
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#define _LDCONFIG_H
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2013-05-01 15:46:34 +00:00
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#include <stdint.h>
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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
2013-09-18 20:04:27 +00:00
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#define FLAG_ANY -1
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#define FLAG_TYPE_MASK 0x00ff
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#define FLAG_LIBC4 0x0000
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#define FLAG_ELF 0x0001
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#define FLAG_ELF_LIBC5 0x0002
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#define FLAG_ELF_LIBC6 0x0003
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#define FLAG_REQUIRED_MASK 0xff00
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#define FLAG_SPARC_LIB64 0x0100
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#define FLAG_IA64_LIB64 0x0200
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#define FLAG_X8664_LIB64 0x0300
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#define FLAG_S390_LIB64 0x0400
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#define FLAG_POWERPC_LIB64 0x0500
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#define FLAG_MIPS64_LIBN32 0x0600
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#define FLAG_MIPS64_LIBN64 0x0700
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#define FLAG_X8664_LIBX32 0x0800
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#define FLAG_ARM_LIBHF 0x0900
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#define FLAG_AARCH64_LIB64 0x0a00
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#define FLAG_ARM_LIBSF 0x0b00
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#define FLAG_MIPS_LIB32_NAN2008 0x0c00
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#define FLAG_MIPS64_LIBN32_NAN2008 0x0d00
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#define FLAG_MIPS64_LIBN64_NAN2008 0x0e00
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1999-12-04 08:00:00 +00:00
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2007-08-01 Andreas Jaeger <aj@suse.de>
Jakub Jelinek <jakub@redhat.com>
* elf/ldconfig.c (opt_ignore_aux_cache): Add new option.
(options): Add option.
(parse_opt): Handle option.
(manual_link): Adjust process_file caller. Call implicit_soname.
(search_dir): Formatting. Use and populate auxiliary cache.
(main): Load and save auxiliary cache.
* elf/readlib.c (process_file): Add stat_buf argument. Pass struct
stat64 from fstat64 to caller.
(implicit_soname): New function.
* elf/readelflib.c (process_elf_file): If DT_SONAME is not present,
leave *soname as NULL.
* elf/cache.c: Include libgen.h.
(print_entry, print_cache, compare, save_cache, add_to_cache):
Formatting and cleanups.
(aux_cache_entry_id, aux_cache_entry, aux_cache_file_entry,
aux_cache_file): New structures.
(AUX_CACHEMAGIC): Define.
(primes): New array.
(aux_hash_size, aux_hash): New variables.
(aux_cache_entry_id_hash, nextprime, init_aux_cache,
search_aux_cache, insert_to_aux_cache, add_to_aux_cache,
load_aux_cache, save_aux_cache): New functions.
* sysdeps/generic/ldconfig.h (_PATH_LDCONFIG_AUX_CACHE): Define.
(init_aux_cache, search_aux_cache, add_to_aux_cache,
load_aux_cache, save_aux_cache, implicit_soname): New prototypes.
(process_file): Adjust prototype.
2007-08-12 20:09:16 +00:00
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/* Name of auxiliary cache. */
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#define _PATH_LDCONFIG_AUX_CACHE "/var/cache/ldconfig/aux-cache"
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1999-12-04 08:00:00 +00:00
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/* Declared in cache.c. */
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extern void print_cache (const char *cache_name);
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extern void init_cache (void);
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extern void save_cache (const char *cache_name);
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2000-05-07 21:23:56 +00:00
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extern void add_to_cache (const char *path, const char *lib, int flags,
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Update.
2001-03-12 Jakub Jelinek <jakub@redhat.com>
* csu/Makefile (abi-tag.h): Define OS and version separately, allow
version to be overriden from config.h.
* csu/abi-note.S: Use OS and version separately, include config.h.
* elf/dl-load.c (_dl_osversion): New.
(_dl_map_object_from_fd): Kill some warnings.
(open_verify): Check .note.ABI-tag of the library if present.
* elf/Makefile (CPPFLAGS-dl-load.c): Add -I$(csu-objpfx).
* elf/cache.c (struct cache_entry): Add osversion.
(print_entry): Print osversion.
(print_cache): Pass osversion to it.
(compare): Sort according to osversion.
(save_cache): Set osversion.
(add_to_cache): Add osversion argument.
* sysdeps/generic/ldconfig.h (add_to_cache, process_file,
process_elf_file): Add osversion argument.
* elf/readlib.c (process_file): Likewise.
* sysdeps/generic/readelflib.c (process_elf_file): Likewise.
* sysdeps/unix/sysv/linux/ia64/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* sysdeps/unix/sysv/linux/i386/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* sysdeps/unix/sysv/linux/sparc/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* elf/ldconfig.c (manual_link): Pass it.
(search_dir): Issue diagnostic if two libs with the same soname in
the same directory have different .note.ABI-tag. Record osversion in
dlib_entry and use it from there.
(struct lib_entry): Remove.
(struct dlib_entry): Add osversion.
* sysdeps/generic/dl-cache.c (_dl_load_cache_lookup): Check
osversion.
* sysdeps/generic/dl-cache.h (struct file_entry_new): Replace __unused
field with osversion.
* sysdeps/generic/ldsodefs.h (_dl_osversion): Declare.
* sysdeps/unix/sysv/linux/init-first.c: Include ldsodefs.h.
* sysdeps/unix/sysv/linux/dl-osinfo.h (DL_SYSDEP_OSCHECK): Save kernel
version in _dl_osversion.
* sysdeps/unix/sysv/linux/configure.in: Define __ABI_TAG_VERSION.
* Makerules (build-shlib-helper, build-module-helper): New.
(build-shlib, build-module-helper): Make sure .note.ABI-tag comes
early.
* config.h.in (__ABI_TAG_VERSION): Add.
* elf/dl-minimal.c (__strtoul_internal): Set endptr on return.
* sysdeps/unix/sysv/linux/i386/dl-librecon.h (EXTRA_LD_ENVVARS):
Handle LD_ASSUME_KERNEL.
* sysdeps/unix/sysv/linux/dl-librecon.h: New.
2001-03-16 07:40:05 +00:00
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unsigned int osversion, uint64_t hwcap);
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1999-12-04 08:00:00 +00:00
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2007-08-01 Andreas Jaeger <aj@suse.de>
Jakub Jelinek <jakub@redhat.com>
* elf/ldconfig.c (opt_ignore_aux_cache): Add new option.
(options): Add option.
(parse_opt): Handle option.
(manual_link): Adjust process_file caller. Call implicit_soname.
(search_dir): Formatting. Use and populate auxiliary cache.
(main): Load and save auxiliary cache.
* elf/readlib.c (process_file): Add stat_buf argument. Pass struct
stat64 from fstat64 to caller.
(implicit_soname): New function.
* elf/readelflib.c (process_elf_file): If DT_SONAME is not present,
leave *soname as NULL.
* elf/cache.c: Include libgen.h.
(print_entry, print_cache, compare, save_cache, add_to_cache):
Formatting and cleanups.
(aux_cache_entry_id, aux_cache_entry, aux_cache_file_entry,
aux_cache_file): New structures.
(AUX_CACHEMAGIC): Define.
(primes): New array.
(aux_hash_size, aux_hash): New variables.
(aux_cache_entry_id_hash, nextprime, init_aux_cache,
search_aux_cache, insert_to_aux_cache, add_to_aux_cache,
load_aux_cache, save_aux_cache): New functions.
* sysdeps/generic/ldconfig.h (_PATH_LDCONFIG_AUX_CACHE): Define.
(init_aux_cache, search_aux_cache, add_to_aux_cache,
load_aux_cache, save_aux_cache, implicit_soname): New prototypes.
(process_file): Adjust prototype.
2007-08-12 20:09:16 +00:00
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extern void init_aux_cache (void);
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extern void load_aux_cache (const char *aux_cache_name);
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extern int search_aux_cache (struct stat64 *stat_buf, int *flags,
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unsigned int *osversion, char **soname);
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extern void add_to_aux_cache (struct stat64 *stat_buf, int flags,
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unsigned int osversion, const char *soname);
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extern void save_aux_cache (const char *aux_cache_name);
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1999-12-04 08:00:00 +00:00
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/* Declared in readlib.c. */
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2000-09-30 00:54:42 +00:00
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extern int process_file (const char *real_file_name, const char *file_name,
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Update.
2001-03-12 Jakub Jelinek <jakub@redhat.com>
* csu/Makefile (abi-tag.h): Define OS and version separately, allow
version to be overriden from config.h.
* csu/abi-note.S: Use OS and version separately, include config.h.
* elf/dl-load.c (_dl_osversion): New.
(_dl_map_object_from_fd): Kill some warnings.
(open_verify): Check .note.ABI-tag of the library if present.
* elf/Makefile (CPPFLAGS-dl-load.c): Add -I$(csu-objpfx).
* elf/cache.c (struct cache_entry): Add osversion.
(print_entry): Print osversion.
(print_cache): Pass osversion to it.
(compare): Sort according to osversion.
(save_cache): Set osversion.
(add_to_cache): Add osversion argument.
* sysdeps/generic/ldconfig.h (add_to_cache, process_file,
process_elf_file): Add osversion argument.
* elf/readlib.c (process_file): Likewise.
* sysdeps/generic/readelflib.c (process_elf_file): Likewise.
* sysdeps/unix/sysv/linux/ia64/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* sysdeps/unix/sysv/linux/i386/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* sysdeps/unix/sysv/linux/sparc/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* elf/ldconfig.c (manual_link): Pass it.
(search_dir): Issue diagnostic if two libs with the same soname in
the same directory have different .note.ABI-tag. Record osversion in
dlib_entry and use it from there.
(struct lib_entry): Remove.
(struct dlib_entry): Add osversion.
* sysdeps/generic/dl-cache.c (_dl_load_cache_lookup): Check
osversion.
* sysdeps/generic/dl-cache.h (struct file_entry_new): Replace __unused
field with osversion.
* sysdeps/generic/ldsodefs.h (_dl_osversion): Declare.
* sysdeps/unix/sysv/linux/init-first.c: Include ldsodefs.h.
* sysdeps/unix/sysv/linux/dl-osinfo.h (DL_SYSDEP_OSCHECK): Save kernel
version in _dl_osversion.
* sysdeps/unix/sysv/linux/configure.in: Define __ABI_TAG_VERSION.
* Makerules (build-shlib-helper, build-module-helper): New.
(build-shlib, build-module-helper): Make sure .note.ABI-tag comes
early.
* config.h.in (__ABI_TAG_VERSION): Add.
* elf/dl-minimal.c (__strtoul_internal): Set endptr on return.
* sysdeps/unix/sysv/linux/i386/dl-librecon.h (EXTRA_LD_ENVVARS):
Handle LD_ASSUME_KERNEL.
* sysdeps/unix/sysv/linux/dl-librecon.h: New.
2001-03-16 07:40:05 +00:00
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const char *lib, int *flag, unsigned int *osversion,
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2007-08-01 Andreas Jaeger <aj@suse.de>
Jakub Jelinek <jakub@redhat.com>
* elf/ldconfig.c (opt_ignore_aux_cache): Add new option.
(options): Add option.
(parse_opt): Handle option.
(manual_link): Adjust process_file caller. Call implicit_soname.
(search_dir): Formatting. Use and populate auxiliary cache.
(main): Load and save auxiliary cache.
* elf/readlib.c (process_file): Add stat_buf argument. Pass struct
stat64 from fstat64 to caller.
(implicit_soname): New function.
* elf/readelflib.c (process_elf_file): If DT_SONAME is not present,
leave *soname as NULL.
* elf/cache.c: Include libgen.h.
(print_entry, print_cache, compare, save_cache, add_to_cache):
Formatting and cleanups.
(aux_cache_entry_id, aux_cache_entry, aux_cache_file_entry,
aux_cache_file): New structures.
(AUX_CACHEMAGIC): Define.
(primes): New array.
(aux_hash_size, aux_hash): New variables.
(aux_cache_entry_id_hash, nextprime, init_aux_cache,
search_aux_cache, insert_to_aux_cache, add_to_aux_cache,
load_aux_cache, save_aux_cache): New functions.
* sysdeps/generic/ldconfig.h (_PATH_LDCONFIG_AUX_CACHE): Define.
(init_aux_cache, search_aux_cache, add_to_aux_cache,
load_aux_cache, save_aux_cache, implicit_soname): New prototypes.
(process_file): Adjust prototype.
2007-08-12 20:09:16 +00:00
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char **soname, int is_link, struct stat64 *stat_buf);
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extern char *implicit_soname (const char *lib, int flag);
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1999-12-04 08:00:00 +00:00
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/* Declared in readelflib.c. */
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extern int process_elf_file (const char *file_name, const char *lib, int *flag,
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Update.
2001-03-12 Jakub Jelinek <jakub@redhat.com>
* csu/Makefile (abi-tag.h): Define OS and version separately, allow
version to be overriden from config.h.
* csu/abi-note.S: Use OS and version separately, include config.h.
* elf/dl-load.c (_dl_osversion): New.
(_dl_map_object_from_fd): Kill some warnings.
(open_verify): Check .note.ABI-tag of the library if present.
* elf/Makefile (CPPFLAGS-dl-load.c): Add -I$(csu-objpfx).
* elf/cache.c (struct cache_entry): Add osversion.
(print_entry): Print osversion.
(print_cache): Pass osversion to it.
(compare): Sort according to osversion.
(save_cache): Set osversion.
(add_to_cache): Add osversion argument.
* sysdeps/generic/ldconfig.h (add_to_cache, process_file,
process_elf_file): Add osversion argument.
* elf/readlib.c (process_file): Likewise.
* sysdeps/generic/readelflib.c (process_elf_file): Likewise.
* sysdeps/unix/sysv/linux/ia64/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* sysdeps/unix/sysv/linux/i386/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* sysdeps/unix/sysv/linux/sparc/readelflib.c (process_elf_file,
process_elf32_file, process_elf64_file): Likewise.
* elf/ldconfig.c (manual_link): Pass it.
(search_dir): Issue diagnostic if two libs with the same soname in
the same directory have different .note.ABI-tag. Record osversion in
dlib_entry and use it from there.
(struct lib_entry): Remove.
(struct dlib_entry): Add osversion.
* sysdeps/generic/dl-cache.c (_dl_load_cache_lookup): Check
osversion.
* sysdeps/generic/dl-cache.h (struct file_entry_new): Replace __unused
field with osversion.
* sysdeps/generic/ldsodefs.h (_dl_osversion): Declare.
* sysdeps/unix/sysv/linux/init-first.c: Include ldsodefs.h.
* sysdeps/unix/sysv/linux/dl-osinfo.h (DL_SYSDEP_OSCHECK): Save kernel
version in _dl_osversion.
* sysdeps/unix/sysv/linux/configure.in: Define __ABI_TAG_VERSION.
* Makerules (build-shlib-helper, build-module-helper): New.
(build-shlib, build-module-helper): Make sure .note.ABI-tag comes
early.
* config.h.in (__ABI_TAG_VERSION): Add.
* elf/dl-minimal.c (__strtoul_internal): Set endptr on return.
* sysdeps/unix/sysv/linux/i386/dl-librecon.h (EXTRA_LD_ENVVARS):
Handle LD_ASSUME_KERNEL.
* sysdeps/unix/sysv/linux/dl-librecon.h: New.
2001-03-16 07:40:05 +00:00
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unsigned int *osversion, char **soname,
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void *file_contents, size_t file_length);
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1999-12-04 08:00:00 +00:00
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2000-09-30 00:54:42 +00:00
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/* Declared in chroot_canon.c. */
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extern char *chroot_canon (const char *chroot, const char *name);
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1999-12-04 08:00:00 +00:00
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/* Declared in ldconfig.c. */
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extern int opt_verbose;
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2000-05-07 21:23:56 +00:00
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extern int opt_format;
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1999-12-04 08:00:00 +00:00
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/* Prototypes for a few program-wide used functions. */
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2012-12-30 22:41:42 +00:00
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#include <programs/xmalloc.h>
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1999-12-04 08:00:00 +00:00
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#endif /* ! _LDCONFIG_H */
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