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0d1e88f8bfb0e62f37bf8a89172cd91373ace5e6
binutils-gdb/ld/config.in
H.J. Lu 0d1e88f8bf x86: Add GLIBC_ABI_GNU2_TLS version dependency 
On Linux/x86, programs and shared libraries compiled with
-mtls-dialect=gnu2 may fail silently at run-time against glibc without
the GNU2 TLS run-time fixes for:

https://sourceware.org/bugzilla/show_bug.cgi?id=31501
https://sourceware.org/bugzilla/show_bug.cgi?id=31372

A version tag, GLIBC_ABI_GNU2_TLS, has been added to glibc to indicate
that glibc has the working GNU2 TLS run-time.  Add the --gnu2-tls-tag
option to i386/x86-64 ELF linker to add the GLIBC_ABI_GNU2_TLS version
dependency in output programs and shared libraries when linking against
glibc if input relocatable object files have R_386_TLS_DESC_CALL or
R_X86_64_TLSDESC_CALL relocation.  The output will fail to load and run
at run-time against glibc which doesn't define the GLIBC_ABI_GNU2_TLS
version.

Add the --enable-gnu2-tls-tag configure option to enable --gnu2-tls-tag
by default.  If unspecified, linker will add the GLIBC_ABI_GNU2_TLS
version dependency if input object files have R_386_TLS_DESC_CALL or
R_X86_64_TLSDESC_CALL relocation and libc.so defines the GLIBC_ABI_GNU2_TLS
version.

Update elf_link_add_glibc_verneed to properly add the GLIBC_2.36 version
dependency when -z mark-plt -z nopack-relative-relocs passed to x86-64
ELF linker.

bfd/

	PR ld/33130
	* elf-bfd.h (_bfd_elf_link_add_glibc_version_dependency): Add
	a pointer to bool argument.
	* elf-linker-x86.h (elf_linker_x86_params): Add
	gnu2_tls_version_tag.
	* elf32-i386.c (elf_i386_scan_relocs): Set has_tls_desc_call to
	1 for R_386_TLS_DESC_CALL.
	(elf_i386_add_glibc_version_dependency): New.  Undef before
	FreeBSD support.
	* elf64-x86-64.c (elf_x86_64_scan_relocs): Set has_tls_desc_call
	to 1 for R_X86_64_TLSDESC_CALL.
	(elf_x86_64_add_glibc_version_dependency): Add GLIBC_ABI_GNU2_TLS
	version dependency if GLIBC_ABI_GNU2_TLS dependency isn't disabled
	and has_tlsdesc_call isn't 0.
	(elf_backend_add_glibc_version_dependency): Undef before FreeBSD
	support and redefine for elf32-x86-64.
	* elflink.c (elf_link_add_glibc_verneed): Changed to return bool.
	Remove the pointer to elf_find_verdep_info argument.  Add a
	pointer to bool argument, auto_version. Return true if linked
	against glibc.  Otherwise return false.  If the version dependency
	is added, set *auto_version to true.  If *auto_version is true,
	add the version dependency only if libc.so defines the version.
	(_bfd_elf_link_add_glibc_version_dependency): Add a pointer to
	bool argument and pass it to elf_link_add_glibc_verneed.
	(_bfd_elf_link_add_dt_relr_dependency): Pass NULL to
	_bfd_elf_link_add_glibc_version_dependency.
	* elfxx-x86.h (elf_x86_link_hash_table): Add has_tls_desc_call.

ld/

	PR ld/33130
	* NEWS: Mention --gnu2-tls-tag, --no-gnu2-tls-tag and
	--enable-gnu2-tls-tag.
	* config.in: Regenerated.
	* configure: Likewise.
	* configure.ac: Add --enable-gnu2-tls-tag.
	* ld.texi: Document --gnu2-tls-tag/--no-gnu2-tls-tag.
	* ldlex.h (option_values): Add OPTION_GNU2_TLS_VERSION_TAG and
	OPTION_NO_GNU2_TLS_VERSION_TAG.
	* emulparams/elf32_x86_64.sh (EXTRA_EM_FILE): Changed to
	"elf-x86-64-glibc".
	* emulparams/elf_i386.sh (EXTRA_EM_FILE): Set to "elf-i386-glibc".
	* emulparams/elf_i386_fbsd.sh (EXTRA_EM_FILE): New.  Set to
	"elf-x86".
        * emulparams/elf_i386_haiku.sh (EXTRA_EM_FILE): Likewise.
	* emulparams/elf_x86_64.sh (EXTRA_EM_FILE): Likewise.
	* emulparams/elf_x86_64_fbsd.sh (EXTRA_EM_FILE): New.  Set to
	"elf-x86-64".
	* emulparams/elf_x86_64_haiku.sh (EXTRA_EM_FILE): Likewise.
	* (EXTRA_EM_FILE): Likewise.
	* (EXTRA_EM_FILE): Likewise.
        * emultempl/elf-i386-glibc.em: New file.
	* emultempl/elf-x86-64-glibc.em: Likewise.
	* emultempl/elf-x86-64.em: Likewise.
	* emultempl/elf-x86-glibc.em: Likewise.
	* emultempl/elf-x86.em (elf_x86_64_before_parse): Removed.
	(LDEMUL_BEFORE_PARSE): Likewise.
	(elf_x86_64_before_allocation): Likewise.
	(LDEMUL_BEFORE_ALLOCATION): Likewise.
	* emultempl/solaris2-x86-64.em: New file.
	* testsuite/ld-i386/gnu2-tls-1.s: Likewise.
	* testsuite/ld-i386/gnu2-tls-1a.rd: Likewise.
	* testsuite/ld-i386/gnu2-tls-1b.rd: Likewise.
	* testsuite/ld-x86-64/gnu2-tls-1.s: Likewise.
	* testsuite/ld-x86-64/gnu2-tls-1a.rd: Likewise.
	* testsuite/ld-x86-64/gnu2-tls-1b.rd: Likewise.
	* testsuite/ld-x86-64/mark-plt-2.rd: Likewise.
	* testsuite/ld-x86-64/mark-plt-2.s: Likewise.
	* testsuite/ld-i386/i386.exp: Run GLIBC_ABI_GNU2_TLS tests.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
2025-08-20 13:53:32 -07:00

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/* config.in. Generated from configure.ac by autoheader. */
/* Check that config.h is #included before system headers
(this works only for glibc, but that should be enough). */
#if defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__CONFIG_H__)
# error config.h must be #included before system headers
#endif
#define __CONFIG_H__ 1
/* Default compression algorithm for --enable-compressed-debug-sections. */
#undef DEFAULT_COMPRESSED_DEBUG_ALGORITHM
/* Define to 1 if you want to emit gnu hash in the ELF linker by default. */
#undef DEFAULT_EMIT_GNU_HASH
/* Define to 1 if you want to emit sysv hash in the ELF linker by default. */
#undef DEFAULT_EMIT_SYSV_HASH
/* Define if you want compressed debug sections by default. */
#undef DEFAULT_FLAG_COMPRESS_DEBUG
/* Define to 1 if you want to turn executable stack warnings into errors by
default. */
#undef DEFAULT_LD_ERROR_EXECSTACK
/* Define to 1 if you want to turn executable segment warnings into errors by
default. */
#undef DEFAULT_LD_ERROR_RWX_SEGMENTS
/* Define to 0 if you want to disable the generation of an executable stack
when a .note-GNU-stack section is missing. */
#undef DEFAULT_LD_EXECSTACK
/* Define to 1 if you want to enable --gnu2-tls-tag in ELF i386/x86-64 linker
by default. */
#undef DEFAULT_LD_GNU2_TLS_TAG
/* Define to 1 if you want to enable --rosegment in the ELF linker by default.
*/
#undef DEFAULT_LD_ROSEGMENT
/* The default method for DT_TEXTREL check in ELF linker. */
#undef DEFAULT_LD_TEXTREL_CHECK
/* Define to 1 if DT_TEXTREL check is warning in ELF linker by default. */
#undef DEFAULT_LD_TEXTREL_CHECK_WARNING
/* Define to 1 if you want to enable --warn-execstack in ELF linker by
default. */
#undef DEFAULT_LD_WARN_EXECSTACK
/* Define to 0 if you want to disable --warn-rwx-segments in ELF linker by
default. */
#undef DEFAULT_LD_WARN_RWX_SEGMENTS
/* Define to 1 if you want to enable -z mark-plt in ELF x86-64 linker by
default. */
#undef DEFAULT_LD_Z_MARK_PLT
/* Define to 1 if you want to enable -z memory_seal in ELF linker by default.
*/
#undef DEFAULT_LD_Z_MEMORY_SEAL
/* Define to 1 if you want to enable -z relro in ELF linker by default. */
#undef DEFAULT_LD_Z_RELRO
/* Define to 1 if you want to enable -z separate-code in ELF linker by
default. */
#undef DEFAULT_LD_Z_SEPARATE_CODE
/* Define to 1 if you want to set DT_RUNPATH instead of DT_RPATH by default.
*/
#undef DEFAULT_NEW_DTAGS
/* Define if you want run-time sanity checks. */
#undef ENABLE_CHECKING
/* Handle .ctf type-info sections */
#undef ENABLE_LIBCTF
/* Define to 1 if translation of program messages to the user's native
language is requested. */
#undef ENABLE_NLS
/* Additional extension a shared object might have. */
#undef EXTRA_SHLIB_EXTENSION
/* Define to choose default GOT handling scheme */
#undef GOT_HANDLING_DEFAULT
/* Define to 1 if you have the Mac OS X function
CFLocaleCopyPreferredLanguages in the CoreFoundation framework. */
#undef HAVE_CFLOCALECOPYPREFERREDLANGUAGES
/* Define to 1 if you have the Mac OS X function CFPreferencesCopyAppValue in
the CoreFoundation framework. */
#undef HAVE_CFPREFERENCESCOPYAPPVALUE
/* Define to 1 if you have the `close' function. */
#undef HAVE_CLOSE
/* Define if the GNU dcgettext() function is already present or preinstalled.
*/
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/* Define to 1 if you have the declaration of `environ', and to 0 if you
don't. */
#undef HAVE_DECL_ENVIRON
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/* Define if you have the iconv() function and it works. */
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/* Define if your <locale.h> file defines LC_MESSAGES. */
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#undef HAVE_LIMITS_H
/* Define to 1 if you have the `lseek' function. */
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/* Define to 1 if you have the `mkstemp' function. */
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/* Define to 1 if you have a working `mmap' system call. */
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/* Define to 1 if you have the `open' function. */
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/* Define to 1 if you have the <sys/file.h> header file. */
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/* Define to 1 if you have the <sys/mman.h> header file. */
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/* Define to 1 if you have the <sys/param.h> header file. */
#undef HAVE_SYS_PARAM_H
/* Define to 1 if you have the <sys/stat.h> header file. */
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/* Define to 1 if you have the <sys/time.h> header file. */
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/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to 1 if you have the `waitpid' function. */
#undef HAVE_WAITPID
/* Define to 1 if you have the <windows.h> header file. */
#undef HAVE_WINDOWS_H
/* Define to 1 if zstd is enabled. */
#undef HAVE_ZSTD
/* Define to the sub-directory in which libtool stores uninstalled libraries.
*/
#undef LT_OBJDIR
/* Name of package */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
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/* Define to the one symbol short name of this package. */
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/* Define to the home page for this package. */
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/* Define to the version of this package. */
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option. */
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/* Enable extensions on AIX 3, Interix. */
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#endif
/* Enable general extensions on Solaris. */
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# undef __EXTENSIONS__
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/* Version number of package */
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/* whether to use inline xxhash */
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`char[]'. */
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# define _DARWIN_USE_64_BIT_INODE 1
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/* Number of bits in a file offset, on hosts where this is settable. */
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/* Define for large files, on AIX-style hosts. */
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/* Define to 1 if on MINIX. */
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/* Define to 2 if the system does not provide POSIX.1 features except with
this defined. */
#undef _POSIX_1_SOURCE
/* Define to 1 if you need to in order for `stat' and other things to work. */
#undef _POSIX_SOURCE
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