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2024-04-25x86: Define MINIMUM_X86_ISA_LEVEL in config.h [BZ #31676]H.J. Lu1-0/+3
Define MINIMUM_X86_ISA_LEVEL at configure time to avoid /usr/bin/ld: …/build/elf/librtld.os: in function `init_cpu_features': …/git/elf/../sysdeps/x86/cpu-features.c:1202: undefined reference to `_dl_runtime_resolve_fxsave' /usr/bin/ld: …/build/elf/librtld.os: relocation R_X86_64_PC32 against undefined hidden symbol `_dl_runtime_resolve_fxsave' can not be used when making a shared object /usr/bin/ld: final link failed: bad value collect2: error: ld returned 1 exit status when glibc is built with -march=x86-64-v3 and configured with --with-rtld-early-cflags=-march=x86-64, which is used to allow ld.so to print an error message on unsupported CPUs: Fatal glibc error: CPU does not support x86-64-v3 This fixes BZ #31676. Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com> (cherry picked from commit 46c999741340ea559784c20a45077955b50aca43)
2024-04-01arm: Update _dl_tlsdesc_dynamic to preserve caller-saved registers (BZ 31372)Adhemerval Zanella1-0/+3
ARM _dl_tlsdesc_dynamic slow path has two issues: * The ip/r12 is defined by AAPCS as a scratch register, and gcc is used to save the stack pointer before on some function calls. So it should also be saved/restored as well. It fixes the tst-gnu2-tls2. * None of the possible VFP registers are saved/restored. ARM has the additional complexity to have different VFP bank sizes (depending of VFP support by the chip). The tst-gnu2-tls2 test is extended to check for VFP registers, although only for hardfp builds. Different than setcontext, _dl_tlsdesc_dynamic does not have HWCAP_ARM_IWMMXT (I don't have a way to properly test it and it is almost a decade since newer hardware was released). With this patch there is no need to mark tst-gnu2-tls2 as XFAIL. Checked on arm-linux-gnueabihf. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 64c7e344289ed085517c2227d8e3b06388242c13)
2023-08-14LoongArch: Add minuimum binutils required versiondengjianbo1-5/+0
LoongArch glibc can add some LASX/LSX vector instructions codes, change the required minimum binutils version to 2.41 which could support vector instructions. HAVE_LOONGARCH_VEC_ASM is removed accordingly.
2023-07-11LoongArch: config: Added HAVE_LOONGARCH_VEC_ASM.caiyinyu1-0/+5
This patch checks if assembler supports vector instructions to generate LASX/LSX code or not, and then define HAVE_LOONGARCH_VEC_ASM macro We have added support for vector instructions in binutils-2.41 See: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=75b2f521b101d974354f6ce9ed7c054d8b2e3b7a commit 75b2f521b101d974354f6ce9ed7c054d8b2e3b7a Author: mengqinggang <mengqinggang@loongson.cn> Date: Thu Jun 22 10:35:28 2023 +0800 LoongArch: gas: Add lsx and lasx instructions support gas/ChangeLog: * config/tc-loongarch.c (md_parse_option): Add lsx and lasx option. (loongarch_after_parse_args): Add lsx and lasx option. opcodes/ChangeLog: * loongarch-opc.c (struct loongarch_ase): Add lsx and lasx instructions.
2023-05-11Stop checking if MiG supports retcode.Flavio Cruz1-3/+0
We already did the same change for Hurd (https://git.savannah.gnu.org/cgit/hurd/hurd.git/commit/?id=ef5924402864ef049f40a39e73967628583bc1a4) Due to MiG requiring the subsystem to be defined early in order to know the size of a port, this was causing a division by zero error during ./configure. We could have just move subsystem to the top of the snippet, however it is simpler to just remove the check given that we have no plans to use some other MiG anyway. HAVE_MIG_RETCODE is removed completely since this will be a no-op either way (compiling against old Hurd headers will work the same, new Hurd headers will result in the same stubs since retcode is a no-op). Message-Id: <ZFspor91aoMwbh9T@jupiter.tail36e24.ts.net>
2023-03-29Remove --enable-tunables configure optionAdhemerval Zanella Netto1-3/+0
And make always supported. The configure option was added on glibc 2.25 and some features require it (such as hwcap mask, huge pages support, and lock elisition tuning). It also simplifies the build permutations. Changes from v1: * Remove glibc.rtld.dynamic_sort changes, it is orthogonal and needs more discussion. * Cleanup more code. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2023-02-07C-SKY: Strip hard float abi from hard float feature.quxm1-1/+4
The hard float abi and hard float are different, Hard float abi: Use float register to pass float type arguments. Hard float: Enable the hard float ISA feature. So the with_fp_cond cannot represent these two features. When -mfloat-abi=softfp, the float abi is soft and hard float is enabled. So add 'with_hard_float_abi' in preconfigure and define 'CSKY_HARD_FLOAT_ABI' if float abi is hard, and use 'CSKY_HARD_FLOAT_ABI' to determine dynamic linker because it is what determines compatibility. And with_fp_cond is still needed to tell glibc whether to enable hard floating feature. In addition, use AC_TRY_COMMAND to test gcc to ensure compatibility between different versions of gcc. The original way has a problem that __CSKY_HARD_FLOAT_FPU_SF__ means the target only has single hard float-points ISA, so it's not defined in CPUs like ck810f. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2022-07-26LoongArch: Add LoongArch entries to config.h.incaiyinyu1-0/+6
2022-05-16Remove kernel version checkAdhemerval Zanella1-0/+3
The kernel version check is used to avoid glibc to run on older kernels where some syscall are not available and fallback code are not enabled to handle graciously fail. However, it does not prevent if the kernel does not correctly advertise its version through vDSO note, uname or procfs. Also kernel version checks are sometime not desirable by users, where they want to deploy on different system with different kernel version knowing the minimum set of syscall is always presented on such systems. The kernel version check has been removed along with the LD_ASSUME_KERNEL environment variable. The minimum kernel used to built glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed when libc.so is issued. Checked on x86_64-linux-gnu.
2022-05-02powerpc32: Remove unused HAVE_PPC_SECURE_PLTFangrui Song1-3/+0
82a79e7d1843f9d90075a0bf2f04557040829bb0 removed the only user of HAVE_PPC_SECURE_PLT. Reviewed-by: Florian Weimer <fweimer@redhat.com>
2022-04-26elf: Replace PI_STATIC_AND_HIDDEN with opposite HIDDEN_VAR_NEEDS_DYNAMIC_RELOCFangrui Song1-3/+3
PI_STATIC_AND_HIDDEN indicates whether accesses to internal linkage variables and hidden visibility variables in a shared object (ld.so) need dynamic relocations (usually R_*_RELATIVE). PI (position independent) in the macro name is a misnomer: a code sequence using GOT is typically position-independent as well, but using dynamic relocations does not meet the requirement. Not defining PI_STATIC_AND_HIDDEN is legacy and we expect that all new ports will define PI_STATIC_AND_HIDDEN. Current ports defining PI_STATIC_AND_HIDDEN are more than the opposite. Change the configure default. No functional change. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2022-04-04Remove -z combreloc and HAVE_Z_COMBRELOCFangrui Song1-3/+0
-z combreloc has been the default regadless of the architecture since binutils commit f4d733664aabd7bd78c82895e030ec9779a92809 (2002). The configure check added in commit fdde83499a05 (2001) has long been unneeded. We can therefore treat HAVE_Z_COMBRELOC as always 1 and delete dead code paths in dl-machine.h files (many were copied from commit a711b01d34ca and ee0cb67ec238). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2022-01-13i386: Remove broken CAN_USE_REGISTER_ASM_EBP (bug 28771)Florian Weimer1-4/+0
The configure check for CAN_USE_REGISTER_ASM_EBP tried to compile a simple function that uses %ebp as an inline assembly operand. If compilation failed, CAN_USE_REGISTER_ASM_EBP was set 0, which eventually had these consequences: (1) %ebx was avoided as an inline assembly operand, with an assembler macro hack to avoid unnecessary register moves. (2) %ebp was avoided as an inline assembly operand, using an out-of-line syscall function for 6-argument system calls. (1) is no longer needed for any GCC version that is supported for building glibc. %ebx can be used directly as a register operand. Therefore, this commit removes the %ebx avoidance completely. This avoids the assembler macro hack, which turns out to be incompatible with the current Systemtap probe macros (which switch to .altmacro unconditionally). (2) is still needed in many build configurations. The existing configure check cannot really capture that because the simple function succeeds to compile, while the full glibc build still fails. Therefore, this commit removes the check, the CAN_USE_REGISTER_ASM_EBP macro, and uses the out-of-line syscall function for 6-argument system calls unconditionally. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2021-12-13Replace --enable-static-pie with --disable-default-pieSiddhesh Poyarekar1-0/+3
Build glibc programs and tests as PIE by default and enable static-pie automatically if the architecture and toolchain supports it. Also add a new configuration option --disable-default-pie to prevent building programs as PIE. Only the following architectures now have PIE disabled by default because they do not work at the moment. hppa, ia64, alpha and csky don't work because the linker is unable to handle a pcrel relocation generated from PIE objects. The microblaze compiler is currently failing with an ICE. GNU hurd tries to enable static-pie, which does not work and hence fails. All these targets have default PIE disabled at the moment and I have left it to the target maintainers to enable PIE on their targets. build-many-glibcs runs clean for all targets. I also tested x86_64 on Fedora and Ubuntu, to verify that the default build as well as --disable-default-pie work as expected with both system toolchains. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-12-04Add --with-timeoutfactor=NUM to specify TIMEOUTFACTORH.J. Lu1-0/+3
On Ice Lake and Tiger Lake laptops, some test programs timeout when there are 3 "make check -j8" runs in parallel. Add --with-timeoutfactor=NUM to specify an integer to scale the timeout of test programs, which can be overriden by TIMEOUTFACTOR environment variable. Reviewed-by: Florian Weimer <fweimer@redhat.com>
2021-10-11elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT)Fangrui Song1-3/+0
Intel MPX failed to gain wide adoption and has been deprecated for a while. GCC 9.1 removed Intel MPX support. Linux kernel removed MPX in 2019. This patch removes the support code from the dynamic loader. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2021-08-24x86-64: Remove assembler AVX512DQ checkH.J. Lu1-3/+0
The minimum GNU binutils requirement is 2.25 which supports AVX512DQ. Remove assembler AVX512DQ check.
2021-08-24x86-64: Remove compiler -mavx512f checkH.J. Lu1-3/+0
The minimum GCC requirement is GCC 6.2 which supports -mavx512f. Remove compiler -mavx512f check. Tested with GCC 6.4.1 on Linux/x86-64.
2021-08-10elf: Unconditionally use __ehdr_startFangrui Song1-3/+0
We can consider __ehdr_start (from binutils 2.23 onwards) unconditionally supported, since configure.ac requires binutils>=2.25. The configure.ac check is related to an ia64 bug fixed by binutils 2.24. See https://sourceware.org/pipermail/libc-alpha/2014-August/053503.html Tested on x86_64-linux-gnu. Tested build-many-glibcs.py with aarch64-linux-gnu and s390x-linux-gnu. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
2021-06-10Add build option to disable usage of scv on powerpcMatheus Castanho1-0/+3
Commit 68ab82f56690ada86ac1e0c46bad06ba189a10ef added support for the scv syscall ABI on powerpc. Since then systems that have kernel and processor support started using scv. However adding the proper support for a new syscall ABI requires changes to several other projects (e.g. qemu, valgrind, strace, kernel), which are gradually receiving support. Meanwhile, having a way to disable scv on glibc at build time can be useful for distros that may encounter conflicts with projects that still do not support the scv ABI, buying time until proper support is added. This commit adds a --disable-scv option that disables scv support and uses sc for all syscalls, like before commit 68ab82f56690ada86ac1e0c46bad06ba189a10ef. Reviewed-by: Raphael M Zinsly <rzinsly@linux.ibm.com>
2021-05-26config: Added HAVE_AARCH64_SVE_ASM for aarch64Naohiro Tamura1-0/+5
This patch checks if assembler supports '-march=armv8.2-a+sve' to generate SVE code or not, and then define HAVE_AARCH64_SVE_ASM macro.
2021-05-19Remove --enable-stackguard-randomization (BZ #27872)Adhemerval Zanella1-3/+0
Last ENABLE_STACKGUARD_RANDOMIZE usage was removed by 4a103975c4.
2021-05-03Add pthread-in-libc, libpthread-routines-var, librt-routines-varFlorian Weimer1-0/+3
These make variables can be used to add routines to different libraries for the Hurd and Linux builds. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2021-04-26powerpc: Add log IFUNC multiarch support for POWER10Raphael Moreira Zinsly1-0/+3
Checked on ppc64le built without --with-cpu, with --with-cpu=power9 and with --disable-multi-arch. Reviewed-by: Matheus Castanho <msc@linux.ibm.com>
2021-04-16Set the retain attribute on _elf_set_element if CC supports [BZ #27492]Fangrui Song1-0/+3
So that text_set_element/data_set_element/bss_set_element defined variables will be retained by the linker. Note: 'used' and 'retain' are orthogonal: 'used' makes sure the variable will not be optimized out; 'retain' prevents section garbage collection if the linker support SHF_GNU_RETAIN. GNU ld 2.37 and LLD 13 will support -z start-stop-gc which allow C identifier name sections to be GCed even if there are live __start_/__stop_ references. Without the change, there are some static linking problems, e.g. _IO_cleanup (libio/genops.c) may be discarded by ld --gc-sections, so stdout is not flushed on exit. Note: GCC may warning 'retain' attribute ignored while __has_attribute(retain) is 1 (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99587). Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2021-03-25Support for multiple versions in versioned_symbol, compat_symbolFlorian Weimer1-0/+4
This essentially folds compat_symbol_unique functionality into compat_symbol. This change eliminates the need for intermediate aliases for defining multiple symbol versions, for both compat_symbol and versioned_symbol. Some binutils versions do not suport multiple versions per symbol on some targets, so aliases are automatically introduced, similar to what compat_symbol_unique did. To reduce symbol table sizes, a configure check is added to avoid these aliases if they are not needed. The new mechanism works with data symbols as well as function symbols, due to the way an assembler-level redirect is used. It is not compatible with weak symbols for old binutils versions, which is why the definition of __malloc_initialize_hook had to be changed. This is not a loss of functionality because weak symbols do not matter to dynamic linking. The placeholder symbol needs repeating in nptl/libpthread-compat.c now that compat_symbol is used, but that seems more obvious than introducing yet another macro. A subtle difference was that compat_symbol_unique made the symbol global automatically. compat_symbol does not do this, so static had to be removed from the definition of __libpthread_version_placeholder. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-03-06x86: Set minimum x86-64 level marker [BZ #27318]H.J. Lu1-0/+6
Since the full ISA set used in an ELF binary is unknown to compiler, an x86-64 ISA level marker indicates the minimum, not maximum, ISA set required to run such an ELF binary. We never guarantee a library with an x86-64 ISA level v3 marker doesn't contain other ISAs beyond x86-64 ISA level v3, like AVX VNNI. We check the x86-64 ISA level marker for the minimum ISA set. Since -march=sandybridge enables only some ISAs in x86-64 ISA level v3, we should set the needed ISA marker to v2. Otherwise, libc is compiled with -march=sandybridge will fail to run on Sandy Bridge: $ ./elf/ld.so ./libc.so ./libc.so: (p) CPU ISA level is lower than required: needed: 7; got: 3 Set the minimum, instead of maximum, x86-64 ISA level marker should have no impact on the glibc-hwcaps directory assignment logic in ldconfig nor ld.so.
2021-01-21configure: Check for static PIE supportSzabolcs Nagy1-0/+3
Add SUPPORT_STATIC_PIE that targets can define if they support static PIE. This requires PI_STATIC_AND_HIDDEN support and various linker features as described in commit 9d7a3741c9e59eba87fb3ca6b9f979befce07826 Add --enable-static-pie configure option to build static PIE [BZ #19574] Currently defined on x86_64, i386 and aarch64 where static PIE is known to work. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-01-07x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker [BZ #26717]H.J. Lu1-0/+3
GCC 11 supports -march=x86-64-v[234] to enable x86 micro-architecture ISA levels: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97250 and -mneeded to emit GNU_PROPERTY_X86_ISA_1_NEEDED property with GNU_PROPERTY_X86_ISA_1_V[234] marker: https://gitlab.com/x86-psABIs/x86-64-ABI/-/merge_requests/13 Binutils support for GNU_PROPERTY_X86_ISA_1_V[234] marker were added by commit b0ab06937385e0ae25cebf1991787d64f439bf12 Author: H.J. Lu <hjl.tools@gmail.com> Date: Fri Oct 30 06:49:57 2020 -0700 x86: Support GNU_PROPERTY_X86_ISA_1_BASELINE marker and commit 32930e4edbc06bc6f10c435dbcc63131715df678 Author: H.J. Lu <hjl.tools@gmail.com> Date: Fri Oct 9 05:05:57 2020 -0700 x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker GNU_PROPERTY_X86_ISA_1_NEEDED property in x86 ELF binaries indicate the micro-architecture ISA level required to execute the binary. The marker must be added by programmers explicitly in one of 3 ways: 1. Pass -mneeded to GCC. 2. Add the marker in the linker inputs as this patch does. 3. Pass -z x86-64-v[234] to the linker. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234] marker support to ld.so if binutils 2.32 or newer is used to build glibc: 1. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234] markers to elf.h. 2. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234] marker to abi-note.o based on the ISA level used to compile abi-note.o, assuming that the same ISA level is used to compile the whole glibc. 3. Add isa_1 to cpu_features to record the supported x86 ISA level. 4. Rename _dl_process_cet_property_note to _dl_process_property_note and add GNU_PROPERTY_X86_ISA_1_V[234] marker detection. 5. Update _rtld_main_check and _dl_open_check to check loaded objects with the incompatible ISA level. 6. Add a testcase to verify that dlopen an x86-64-v4 shared object fails on lesser platforms. 7. Use <get-isa-level.h> in dl-hwcaps-subdirs.c and tst-glibc-hwcaps.c. Tested under i686, x32 and x86-64 modes on x86-64-v2, x86-64-v3 and x86-64-v4 machines. Marked elf/tst-isa-level-1 with x86-64-v4, ran it on x86-64-v3 machine and got: [hjl@gnu-cfl-2 build-x86_64-linux]$ ./elf/tst-isa-level-1 ./elf/tst-isa-level-1: CPU ISA level is lower than required [hjl@gnu-cfl-2 build-x86_64-linux]$
2020-12-21config: Allow memory tagging to be enabled when configuring glibcRichard Earnshaw1-0/+3
This patch adds the configuration machinery to allow memory tagging to be enabled from the command line via the configure option --enable-memory-tagging. The current default is off, though in time we may change that once the API is more stable.
2020-07-13Remove --enable-obsolete-rpc configure flagPetr Vorel1-4/+0
Sun RPC was removed from glibc. This includes rpcgen program, librpcsvc, and Sun RPC headers. Also test for bug #20790 was removed (test for rpcgen). Backward compatibility for old programs is kept only for architectures and ABIs that have been added in or before version 2.28. libtirpc is mature enough, librpcsvc and rpcgen are provided in rpcsvc-proto project. NOTE: libnsl code depends on Sun RPC (installed libnsl headers use installed Sun RPC headers), thus --enable-obsolete-rpc was a dependency for --enable-obsolete-nsl (removed in a previous commit). The arc ABI list file has to be updated because the port was added with the sunrpc symbols Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2020-07-10ARC: Build InfrastructureVineet Gupta1-0/+3
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-07-10powerpc64: Fix calls when r2 is not used [BZ #26173]Tulio Magno Quites Machado Filho1-0/+3
Teach the linker that __mcount_internal, __sigjmp_save_symbol, __syscall_error and __GI_exit do not use r2, so that it does not need to recover r2 after the call. Test at configure time if the assembler supports @notoc and define USE_PPC64_NOTOC.
2020-07-08Remove --enable-obsolete-nsl configure flagPetr Vorel1-4/+0
this means that *always* libnsl is only built as shared library for backward compatibility and the NSS modules libnss_nis and libnss_nisplus are not built at all, libnsl's headers aren't installed. This compatibility is kept only for architectures and ABIs that have been added in or before version 2.28. Replacement implementations based on TIRPC, which additionally support IPv6, are available from <https://github.com/thkukuk/>. This change does not affect libnss_compat which does not depended on libnsl since 2.27 and thus can be used without NIS. libnsl code depends on Sun RPC, e.g. on --enable-obsolete-rpc (installed libnsl headers use installed Sun RPC headers), which will be removed in the following commit.
2020-07-08aarch64: configure check for pac-ret code generationSzabolcs Nagy1-0/+3
Return address signing requires unwinder support, which is present in libgcc since >=gcc-7, however due to bugs the support may be broken in <gcc-10 (and similarly there may be issues in custom unwinders), so pac-ret is not always safe to use. So in assembly code glibc should only use pac-ret if the compiler uses it too. Unfortunately there is no predefined feature macro for it set by the compiler so pac-ret is inferred from the code generation. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-07-08aarch64: configure test for BTI supportSzabolcs Nagy1-0/+3
Check BTI support in the compiler and linker. The check also requires READELF that understands the BTI GNU property note. It is expected to succeed with gcc >=gcc-9 configured with --enable-standard-branch-protection and binutils >=binutils-2.33. Note: passing -mbranch-protection=bti in CFLAGS when building glibc may not be enough to get a glibc that supports BTI because crtbegin* and crtend* provided by the compiler needs to be BTI compatible too. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-05-18x86: Add --enable-cet=permissiveH.J. Lu1-0/+3
When CET is enabled, it is an error to dlopen a non CET enabled shared library in CET enabled application. It may be desirable to make CET permissive, that is disable CET when dlopening a non CET enabled shared library. With the new --enable-cet=permissive configure option, CET is disabled when dlopening a non CET enabled shared library. Add DEFAULT_DL_X86_CET_CONTROL to config.h.in: /* The default value of x86 CET control. */ #define DEFAULT_DL_X86_CET_CONTROL cet_elf_property which enables CET features based on ELF property note. --enable-cet=permissive it to /* The default value of x86 CET control. */ #define DEFAULT_DL_X86_CET_CONTROL cet_permissive which enables CET features permissively. Update tst-cet-legacy-5a, tst-cet-legacy-5b, tst-cet-legacy-6a and tst-cet-legacy-6b to check --enable-cet and --enable-cet=permissive.
2020-05-18Remove NO_CTORS_DTORS_SECTIONS macroFlorian Weimer1-3/+0
This was originally added to support binutils older than version 2.22: <https://sourceware.org/ml/libc-alpha/2010-12/msg00051.html> Since 2.22 is older than the minimum required binutils version for building glibc, we no longer need this. (The changes do not impact the statically linked startup code.)
2019-10-09sparc: Assume GOTDATA support in the toolchainFlorian Weimer1-3/+0
HAVE_GCC_GOTDATA has apparently never been used. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2019-03-22S390: Add configure check to detect support for arch13.Stefan Liebler1-0/+6
Add two configure checks which detect if arch13 is supported by the assembler at all - by explicitely setting the machine - and if it is supported with default settings. ChangeLog: * config.h.in (HAVE_S390_MIN_ARCH13_ZARCH_ASM_SUPPORT, HAVE_S390_ARCH13_ASM_SUPPORT): New undefine. * sysdeps/s390/configure.ac: Add checks for arch13 support. * sysdeps/s390/configure: Regenerated.
2018-12-21Add C-SKY portMao Han1-0/+6
This patch add two abi combinations support for C-SKY ABIV2: soft-float little endian, hard float little endian. C-SKY ABI manual and architecture user guide are available from: https://github.com/c-sky/csky-doc * config.h.in (CSKYABI, CSKY_HARD_FLOAT): New Define. * scripts/build-many-glibcs.py: Add C-SKY targets. * sysdeps/csky/Implies: New file. * sysdeps/csky/Makefile: Likewise. * sysdeps/csky/abiv2/__longjmp.S: Likewise. * sysdeps/csky/abiv2/csky-mcount.S: Likewise. * sysdeps/csky/abiv2/dl-trampoline.S: Likewise. * sysdeps/csky/abiv2/memcmp.S: Likewise. * sysdeps/csky/abiv2/memcpy.S: Likewise. * sysdeps/csky/abiv2/memmove.S: Likewise. * sysdeps/csky/abiv2/memset.S: Likewise. * sysdeps/csky/abiv2/setjmp.S: Likewise. * sysdeps/csky/abiv2/start.S: Likewise. * sysdeps/csky/abiv2/strcmp.S: Likewise. * sysdeps/csky/abiv2/strcpy.S: Likewise. * sysdeps/csky/abiv2/strlen.S: Likewise. * sysdeps/csky/abiv2/tls-macros.h: Likewise. * sysdeps/csky/abort-instr.h: Likewise. * sysdeps/csky/atomic-machine.h: Likewise. * sysdeps/csky/bits/endian.h: Likewise. * sysdeps/csky/bits/fenv.h: Likewise. * sysdeps/csky/bits/link.h: Likewise. * sysdeps/csky/bits/setjmp.h: Likewise. * sysdeps/csky/bsd-_setjmp.S: Likewise. * sysdeps/csky/bsd-setjmp.S: Likewise. * sysdeps/csky/configure: Likewise. * sysdeps/csky/configure.ac: Likewise. * sysdeps/csky/dl-machine.h: Likewise. * sysdeps/csky/dl-procinfo.c: Likewise. * sysdeps/csky/dl-procinfo.h: Likewise. * sysdeps/csky/dl-sysdep.h: Likewise. * sysdeps/csky/dl-tls.h: Likewise. * sysdeps/csky/fpu/fclrexcpt.c: Likewise. * sysdeps/csky/fpu/fedisblxcpt.c: Likewise. * sysdeps/csky/fpu/feenablxcpt.c: Likewise. * sysdeps/csky/fpu/fegetenv.c: Likewise. * sysdeps/csky/fpu/fegetexcept.c: Likewise. * sysdeps/csky/fpu/fegetmode.c: Likewise. * sysdeps/csky/fpu/fegetround.c: Likewise. * sysdeps/csky/fpu/feholdexcpt.c: Likewise. * sysdeps/csky/fpu/fenv_libc.h: Likewise. * sysdeps/csky/fpu/fenv_private.h: Likewise. * sysdeps/csky/fpu/fesetenv.c: Likewise. * sysdeps/csky/fpu/fesetexcept.c: Likewise. * sysdeps/csky/fpu/fesetmode.c: Likewise. * sysdeps/csky/fpu/fesetround.c: Likewise. * sysdeps/csky/fpu/feupdateenv.c: Likewise. * sysdeps/csky/fpu/fgetexcptflg.c: Likewise. * sysdeps/csky/fpu/fix-fp-int-convert-overflow.h: Likewise. * sysdeps/csky/fpu/fraiseexcpt.c: Likewise. * sysdeps/csky/fpu/fsetexcptflg.c: Likewise. * sysdeps/csky/fpu/ftestexcept.c: Likewise. * sysdeps/csky/fpu/libm-test-ulps: Likewise. * sysdeps/csky/fpu/libm-test-ulps-name: Likewise. * sysdeps/csky/fpu_control.h: Likewise. * sysdeps/csky/gccframe.h: Likewise. * sysdeps/csky/jmpbuf-unwind.h: Likewise. * sysdeps/csky/ldsodefs.h: Likewise. * sysdeps/csky/libc-tls.c: Likewise. * sysdeps/csky/linkmap.h: Likewise. * sysdeps/csky/machine-gmon.h: Likewise. * sysdeps/csky/memusage.h: Likewise. * sysdeps/csky/nofpu/Implies: Likewise. * sysdeps/csky/nofpu/libm-test-ulps: Likewise. * sysdeps/csky/nofpu/libm-test-ulps-name: Likewise. * sysdeps/csky/nptl/Makefile: Likewise. * sysdeps/csky/nptl/bits/pthreadtypes-arch.h: Likewise. * sysdeps/csky/nptl/bits/semaphore.h: Likewise. * sysdeps/csky/nptl/pthread-offsets.h: Likewise. * sysdeps/csky/nptl/pthreaddef.h: Likewise. * sysdeps/csky/nptl/tcb-offsets.sym: Likewise. * sysdeps/csky/nptl/tls.h: Likewise. * sysdeps/csky/preconfigure: Likewise. * sysdeps/csky/sfp-machine.h: Likewise. * sysdeps/csky/sotruss-lib.c: Likewise. * sysdeps/csky/stackinfo.h: Likewise. * sysdeps/csky/sysdep.h: Likewise. * sysdeps/csky/tininess.h: Likewise. * sysdeps/csky/tst-audit.h: Likewise. * sysdeps/unix/sysv/linux/csky/Implies: Likewise. * sysdeps/unix/sysv/linux/csky/Makefile: Likewise. * sysdeps/unix/sysv/linux/csky/Versions: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/clone.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/syscall.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/ucontext_i.sym: Likewise. * sysdeps/unix/sysv/linux/csky/bits/procfs.h: Likewise. * sysdeps/unix/sysv/linux/csky/bits/shmlba.h: Likewise. * sysdeps/unix/sysv/linux/csky/c++-types.data: Likewise. * sysdeps/unix/sysv/linux/csky/configure: Likewise. * sysdeps/unix/sysv/linux/csky/configure.ac: Likewise. * sysdeps/unix/sysv/linux/csky/ipc_priv.h: Likewise. * sysdeps/unix/sysv/linux/csky/jmp_buf-macros.h: Likewise. * sysdeps/unix/sysv/linux/csky/kernel-features.h: Likewise. * sysdeps/unix/sysv/linux/csky/ld.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/ldconfig.h: Likewise. * sysdeps/unix/sysv/linux/csky/libBrokenLocale.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libanl.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libcrypt.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libdl.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libpthread.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libresolv.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/librt.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libthread_db.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/libutil.abilist: Likewise. * sysdeps/unix/sysv/linux/csky/localplt.data: Likewise. * sysdeps/unix/sysv/linux/csky/makecontext.c: Likewise. * sysdeps/unix/sysv/linux/csky/profil-counter.h: Likewise. * sysdeps/unix/sysv/linux/csky/pt-vfork.S: Likewise. * sysdeps/unix/sysv/linux/csky/register-dump.h: Likewise. * sysdeps/unix/sysv/linux/csky/shlib-versions: Likewise. * sysdeps/unix/sysv/linux/csky/sigcontextinfo.h: Likewise. * sysdeps/unix/sysv/linux/csky/sys/cachectl.h: Likewise. * sysdeps/unix/sysv/linux/csky/sys/ucontext.h: Likewise. * sysdeps/unix/sysv/linux/csky/sys/user.h: Likewise. * sysdeps/unix/sysv/linux/csky/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/csky/sysdep.h: Likewise.
2018-12-18S390: Add configure check to detect z13 as mininum architecture level set.Stefan Liebler1-0/+3
Add a configure check for z13 in the same way as done for z196. ChangeLog: * config.h.in (HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT): New undefine. * sysdeps/s390/configure.ac: Add check for z13 support. * sysdeps/s390/configure: Regenerated.
2018-12-18S390: Add configure check to detect z10 as mininum architecture level set.Stefan Liebler1-0/+3
Add a configure check for z10 in the same way as done for z196. ChangeLog: * config.h.in (HAVE_S390_MIN_Z10_ZARCH_ASM_SUPPORT): New undefine. * sysdeps/s390/configure.ac: Add check for z10 support. * sysdeps/s390/configure: Regenerated.
2018-05-23Switch IDNA implementation to libidn2 [BZ #19728] [BZ #19729] [BZ #22247]Florian Weimer1-3/+0
This provides an implementation of the IDNA2008 standard and fixes CVE-2016-6261, CVE-2016-6263, CVE-2017-14062.
2018-01-29Add RISC-V entries to config.h.inPalmer Dabbelt1-0/+5
These were autogenerated. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * config.h.in: Regenerate.
2017-12-15Add --enable-static-pie configure option to build static PIE [BZ #19574]H.J. Lu1-0/+3
Static PIE extends address space layout randomization to static executables. It provides additional security hardening benefits at the cost of some memory and performance. Dynamic linker, ld.so, is a standalone program which can be loaded at any address. This patch adds a configure option, --enable-static-pie, to embed the part of ld.so in static executable to create static position independent executable (static PIE). A static PIE is similar to static executable, but can be loaded at any address without help from a dynamic linker. When --enable-static-pie is used to configure glibc, libc.a is built as PIE and all static executables, including tests, are built as static PIE. The resulting libc.a can be used together with GCC 8 or above to build static PIE with the compiler option, -static-pie. But GCC 8 isn't required to build glibc with --enable-static-pie. Only GCC with PIE support is needed. When an older GCC is used to build glibc with --enable-static-pie, proper input files are passed to linker to create static executables as static PIE, together with "-z text" to prevent dynamic relocations in read-only segments, which are not allowed in static PIE. The following changes are made for static PIE: 1. Add a new function, _dl_relocate_static_pie, to: a. Get the run-time load address. b. Read the dynamic section. c. Perform dynamic relocations. Dynamic linker also performs these steps. But static PIE doesn't load any shared objects. 2. Call _dl_relocate_static_pie at entrance of LIBC_START_MAIN in libc.a. crt1.o, which is used to create dynamic and non-PIE static executables, is updated to include a dummy _dl_relocate_static_pie. rcrt1.o is added to create static PIE, which will link in the real _dl_relocate_static_pie. grcrt1.o is also added to create static PIE with -pg. GCC 8 has been updated to support rcrt1.o and grcrt1.o for static PIE. Static PIE can work on all architectures which support PIE, provided: 1. Target must support accessing of local functions without dynamic relocations, which is needed in start.S to call __libc_start_main with function addresses of __libc_csu_init, __libc_csu_fini and main. All functions in static PIE are local functions. If PIE start.S can't reach main () defined in a shared object, the code sequence: pass address of local_main to __libc_start_main ... local_main: tail call to main via PLT can be used. 2. start.S is updated to check PIC instead SHARED for PIC code path and avoid dynamic relocation, when PIC is defined and SHARED isn't defined, to support static PIE. 3. All assembly codes are updated check PIC instead SHARED for PIC code path to avoid dynamic relocations in read-only sections. 4. All assembly codes are updated check SHARED instead PIC for static symbol name. 5. elf_machine_load_address in dl-machine.h are updated to support static PIE. 6. __brk works without TLS nor dynamic relocations in read-only section so that it can be used by __libc_setup_tls to initializes TLS in static PIE. NB: When glibc is built with GCC defaulted to PIE, libc.a is compiled with -fPIE, regardless if --enable-static-pie is used to configure glibc. When glibc is configured with --enable-static-pie, libc.a is compiled with -fPIE, regardless whether GCC defaults to PIE or not. The same libc.a can be used to build both static executable and static PIE. There is no need for separate PIE copy of libc.a. On x86-64, the normal static sln: text data bss dec hex filename 625425 8284 5456 639165 9c0bd elf/sln the static PIE sln: text data bss dec hex filename 657626 20636 5392 683654 a6e86 elf/sln The code size is increased by 5% and the binary size is increased by 7%. Linker requirements to build glibc with --enable-static-pie: 1. Linker supports --no-dynamic-linker to remove PT_INTERP segment from static PIE. 2. Linker can create working static PIE. The x86-64 linker needs the fix for https://sourceware.org/bugzilla/show_bug.cgi?id=21782 The i386 linker needs to be able to convert "movl main@GOT(%ebx), %eax" to "leal main@GOTOFF(%ebx), %eax" if main is defined locally. Binutils 2.29 or above are OK for i686 and x86-64. But linker status for other targets need to be verified. 3. Linker should resolve undefined weak symbols to 0 in static PIE: https://sourceware.org/bugzilla/show_bug.cgi?id=22269 4. Many ELF backend linkers incorrectly check bfd_link_pic for TLS relocations, which should check bfd_link_executable instead: https://sourceware.org/bugzilla/show_bug.cgi?id=22263 Tested on aarch64, i686 and x86-64. Using GCC 7 and binutils master branch, build-many-glibcs.py with --enable-static-pie with all patches for static PIE applied have the following build successes: PASS: glibcs-aarch64_be-linux-gnu build PASS: glibcs-aarch64-linux-gnu build PASS: glibcs-armeb-linux-gnueabi-be8 build PASS: glibcs-armeb-linux-gnueabi build PASS: glibcs-armeb-linux-gnueabihf-be8 build PASS: glibcs-armeb-linux-gnueabihf build PASS: glibcs-arm-linux-gnueabi build PASS: glibcs-arm-linux-gnueabihf build PASS: glibcs-arm-linux-gnueabihf-v7a build PASS: glibcs-arm-linux-gnueabihf-v7a-disable-multi-arch build PASS: glibcs-m68k-linux-gnu build PASS: glibcs-microblazeel-linux-gnu build PASS: glibcs-microblaze-linux-gnu build PASS: glibcs-mips64el-linux-gnu-n32 build PASS: glibcs-mips64el-linux-gnu-n32-nan2008 build PASS: glibcs-mips64el-linux-gnu-n32-nan2008-soft build PASS: glibcs-mips64el-linux-gnu-n32-soft build PASS: glibcs-mips64el-linux-gnu-n64 build PASS: glibcs-mips64el-linux-gnu-n64-nan2008 build PASS: glibcs-mips64el-linux-gnu-n64-nan2008-soft build PASS: glibcs-mips64el-linux-gnu-n64-soft build PASS: glibcs-mips64-linux-gnu-n32 build PASS: glibcs-mips64-linux-gnu-n32-nan2008 build PASS: glibcs-mips64-linux-gnu-n32-nan2008-soft build PASS: glibcs-mips64-linux-gnu-n32-soft build PASS: glibcs-mips64-linux-gnu-n64 build PASS: glibcs-mips64-linux-gnu-n64-nan2008 build PASS: glibcs-mips64-linux-gnu-n64-nan2008-soft build PASS: glibcs-mips64-linux-gnu-n64-soft build PASS: glibcs-mipsel-linux-gnu build PASS: glibcs-mipsel-linux-gnu-nan2008 build PASS: glibcs-mipsel-linux-gnu-nan2008-soft build PASS: glibcs-mipsel-linux-gnu-soft build PASS: glibcs-mips-linux-gnu build PASS: glibcs-mips-linux-gnu-nan2008 build PASS: glibcs-mips-linux-gnu-nan2008-soft build PASS: glibcs-mips-linux-gnu-soft build PASS: glibcs-nios2-linux-gnu build PASS: glibcs-powerpc64le-linux-gnu build PASS: glibcs-powerpc64-linux-gnu build PASS: glibcs-tilegxbe-linux-gnu-32 build PASS: glibcs-tilegxbe-linux-gnu build PASS: glibcs-tilegx-linux-gnu-32 build PASS: glibcs-tilegx-linux-gnu build PASS: glibcs-tilepro-linux-gnu build and the following build failures: FAIL: glibcs-alpha-linux-gnu build elf/sln is failed to link due to: assertion fail bfd/elf64-alpha.c:4125 This is caused by linker bug and/or non-PIC code in PIE libc.a. FAIL: glibcs-hppa-linux-gnu build elf/sln is failed to link due to: collect2: fatal error: ld terminated with signal 11 [Segmentation fault] https://sourceware.org/bugzilla/show_bug.cgi?id=22537 FAIL: glibcs-ia64-linux-gnu build elf/sln is failed to link due to: collect2: fatal error: ld terminated with signal 11 [Segmentation fault] FAIL: glibcs-powerpc-linux-gnu build FAIL: glibcs-powerpc-linux-gnu-soft build FAIL: glibcs-powerpc-linux-gnuspe build FAIL: glibcs-powerpc-linux-gnuspe-e500v1 build elf/sln is failed to link due to: ld: read-only segment has dynamic relocations. This is caused by linker bug and/or non-PIC code in PIE libc.a. See: https://sourceware.org/bugzilla/show_bug.cgi?id=22264 FAIL: glibcs-powerpc-linux-gnu-power4 build elf/sln is failed to link due to: findlocale.c:96:(.text+0x22c): @local call to ifunc memchr This is caused by linker bug and/or non-PIC code in PIE libc.a. FAIL: glibcs-s390-linux-gnu build elf/sln is failed to link due to: collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core dumped assertion fail bfd/elflink.c:14299 This is caused by linker bug and/or non-PIC code in PIE libc.a. FAIL: glibcs-sh3eb-linux-gnu build FAIL: glibcs-sh3-linux-gnu build FAIL: glibcs-sh4eb-linux-gnu build FAIL: glibcs-sh4eb-linux-gnu-soft build FAIL: glibcs-sh4-linux-gnu build FAIL: glibcs-sh4-linux-gnu-soft build elf/sln is failed to link due to: ld: read-only segment has dynamic relocations. This is caused by linker bug and/or non-PIC code in PIE libc.a. See: https://sourceware.org/bugzilla/show_bug.cgi?id=22263 Also TLS code sequence in SH assembly syscalls in glibc doesn't match TLS code sequence expected by ld: https://sourceware.org/bugzilla/show_bug.cgi?id=22270 FAIL: glibcs-sparc64-linux-gnu build FAIL: glibcs-sparcv9-linux-gnu build FAIL: glibcs-tilegxbe-linux-gnu build FAIL: glibcs-tilegxbe-linux-gnu-32 build FAIL: glibcs-tilegx-linux-gnu build FAIL: glibcs-tilegx-linux-gnu-32 build FAIL: glibcs-tilepro-linux-gnu build elf/sln is failed to link due to: ld: read-only segment has dynamic relocations. This is caused by linker bug and/or non-PIC code in PIE libc.a. See: https://sourceware.org/bugzilla/show_bug.cgi?id=22263 [BZ #19574] * INSTALL: Regenerated. * Makeconfig (real-static-start-installed-name): New. (pic-default): Updated for --enable-static-pie. (pie-default): New for --enable-static-pie. (default-pie-ldflag): Likewise. (+link-static-before-libc): Replace $(DEFAULT-LDFLAGS-$(@F)) with $(if $($(@F)-no-pie),$(no-pie-ldflag),$(default-pie-ldflag)). Replace $(static-start-installed-name) with $(real-static-start-installed-name). (+prectorT): Updated for --enable-static-pie. (+postctorT): Likewise. (CFLAGS-.o): Add $(pie-default). (CFLAGS-.op): Likewise. * NEWS: Mention --enable-static-pie. * config.h.in (ENABLE_STATIC_PIE): New. * configure.ac (--enable-static-pie): New configure option. (have-no-dynamic-linker): New LIBC_CONFIG_VAR. (have-static-pie): Likewise. Enable static PIE if linker supports --no-dynamic-linker. (ENABLE_STATIC_PIE): New AC_DEFINE. (enable-static-pie): New LIBC_CONFIG_VAR. * configure: Regenerated. * csu/Makefile (omit-deps): Add r$(start-installed-name) and gr$(start-installed-name) for --enable-static-pie. (extra-objs): Likewise. (install-lib): Likewise. (extra-objs): Add static-reloc.o and static-reloc.os ($(objpfx)$(start-installed-name)): Also depend on $(objpfx)static-reloc.o. ($(objpfx)r$(start-installed-name)): New. ($(objpfx)g$(start-installed-name)): Also depend on $(objpfx)static-reloc.os. ($(objpfx)gr$(start-installed-name)): New. * csu/libc-start.c (LIBC_START_MAIN): Call _dl_relocate_static_pie in libc.a. * csu/libc-tls.c (__libc_setup_tls): Add main_map->l_addr to initimage. * csu/static-reloc.c: New file. * elf/Makefile (routines): Add dl-reloc-static-pie. (elide-routines.os): Likewise. (DEFAULT-LDFLAGS-tst-tls1-static-non-pie): Removed. (tst-tls1-static-non-pie-no-pie): New. * elf/dl-reloc-static-pie.c: New file. * elf/dl-support.c (_dl_get_dl_main_map): New function. * elf/dynamic-link.h (ELF_DURING_STARTUP): Also check STATIC_PIE_BOOTSTRAP. * elf/get-dynamic-info.h (elf_get_dynamic_info): Likewise. * gmon/Makefile (tests): Add tst-gmon-static-pie. (tests-static): Likewise. (DEFAULT-LDFLAGS-tst-gmon-static): Removed. (tst-gmon-static-no-pie): New. (CFLAGS-tst-gmon-static-pie.c): Likewise. (CRT-tst-gmon-static-pie): Likewise. (tst-gmon-static-pie-ENV): Likewise. (tests-special): Likewise. ($(objpfx)tst-gmon-static-pie.out): Likewise. (clean-tst-gmon-static-pie-data): Likewise. ($(objpfx)tst-gmon-static-pie-gprof.out): Likewise. * gmon/tst-gmon-static-pie.c: New file. * manual/install.texi: Document --enable-static-pie. * sysdeps/generic/ldsodefs.h (_dl_relocate_static_pie): New. (_dl_get_dl_main_map): Likewise. * sysdeps/i386/configure.ac: Check if linker supports static PIE. * sysdeps/x86_64/configure.ac: Likewise. * sysdeps/i386/configure: Regenerated. * sysdeps/x86_64/configure: Likewise. * sysdeps/mips/Makefile (ASFLAGS-.o): Add $(pie-default). (ASFLAGS-.op): Likewise.
2017-12-05Add elision tunablesRogerio Alves1-3/+0
This patch adds several new tunables to control the behavior of elision on supported platforms[1]. Since elision now depends on tunables, we should always *compile* with elision enabled, and leave the code disabled, but available for runtime selection. This gives us *much* better compile-time testing of the existing code to avoid bit-rot[2]. Tested on ppc, ppc64, ppc64le, s390x and x86_64. [1] This part of the patch was initially proposed by Paul Murphy but was "staled" because the framework have changed since the patch was originally proposed: https://patchwork.sourceware.org/patch/10342/ [2] This part of the patch was inititally proposed as a RFC by Carlos O'Donnell. Make sense to me integrate this on the patch: https://sourceware.org/ml/libc-alpha/2017-05/msg00335.html * elf/dl-tunables.list: Add elision parameters. * manual/tunables.texi: Add entries about elision tunable. * sysdeps/unix/sysv/linux/powerpc/elision-conf.c: Add callback functions to dynamically enable/disable elision. Add multiple callbacks functions to set elision parameters. Deleted __libc_enable_secure check. * sysdeps/unix/sysv/linux/s390/elision-conf.c: Likewise. * sysdeps/unix/sysv/linux/x86/elision-conf.c: Likewise. * configure: Regenerated. * configure.ac: Option enable_lock_elision was deleted. * config.h.in: ENABLE_LOCK_ELISION flag was deleted. * config.make.in: Remove references to enable_lock_elision. * manual/install.texi: Elision configure option was removed. * INSTALL: Regenerated to remove enable_lock_elision. * nptl/Makefile: Disable elision so it can verify error case for destroying a mutex. * sysdeps/powerpc/nptl/elide.h: Cleanup ENABLE_LOCK_ELISION check. Deleted macros for the case when ENABLE_LOCK_ELISION was not defined. * sysdeps/s390/configure: Regenerated. * sysdeps/s390/configure.ac: Remove references to enable_lock_elision.. * nptl/tst-mutex8.c: Deleted all #ifndef ENABLE_LOCK_ELISION from the test. * sysdeps/powerpc/powerpc32/sysdep.h: Deleted all ENABLE_LOCK_ELISION checks. * sysdeps/powerpc/powerpc64/sysdep.h: Likewise. * sysdeps/powerpc/sysdep.h: Likewise. * sysdeps/s390/nptl/bits/pthreadtypes-arch.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/force-elision.h: Likewise. * sysdeps/unix/sysv/linux/s390/elision-conf.h: Likewise. * sysdeps/unix/sysv/linux/s390/force-elision.h: Likewise. * sysdeps/unix/sysv/linux/s390/lowlevellock.h: Likewise. * sysdeps/unix/sysv/linux/s390/Makefile: Remove references to enable-lock-elision. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
2017-11-29sparc: Assume VIS3 supportAdhemerval Zanella1-3/+0
This patch assumes VIS3 support by binutils, which is supported since version 2.22. This leads to some code simplification, mostly on multiarch build where there is only one variant instead of previously two (whether binutils supports VIS3 instructions or not). For multiarch files where HAVE_AS_VIS3_SUPPORT was checked and the default implementation was built with a different name, a new file with (implementation with -generic appended) is added. Checked on sparc64-linux-gnu and sparcv9-linux-gnu. * config.h.in (HAVE_AS_VIS3_SUPPORT): Remove check for VIS3 support. * sysdeps/sparc/configure.ac (HAVE_AS_VIS3_SUPPORT): Likewise. * sysdeps//sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c: Likewise. * sysdeps//sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf.c: Likewise. * sysdeps//sparc/sparc32/sparcv9/fpu/multiarch/s_fma.c: Likewise. * sysdeps//sparc/sparc32/sparcv9/fpu/multiarch/s_fmaf.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceil.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceilf.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_floor.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_floorf.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_fma.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_fmaf.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_trunc.c: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_truncf.c: Likewise. * sysdeps/sparc/sparc-ifunc.h [!HAVE_AS_VIS3_SUPPORT] (SPARC_ASM_VIS3_IFUNC, SPARC_ASM_VIS3_VIS2_IFUNC): Remove macros. * sysdeps/sparc/sparc32/sparcv9/Makefile [$(have-as-vis3) != yes] (ASFLAGS.o, ASFLAGS-.os, ASFLAGS-.op, ASFLAGS-.oS): Remove rules. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile ($(have-as-vis3) == yes): Remove conditional. * sysdeps/sparc/sparc64/Makefile (($(have-as-vis3) == yes)): Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-generic.c: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf-generic.c: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fma-generic.c: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fmaf-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceilf-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_floor-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_floorf-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_fma-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_fmaf-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_trunc-generic.c: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_truncf-generic.c: New file. Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2017-10-04Don't use hidden visibility in libc.a with PIE on i386H.J. Lu1-0/+4
On i386, when multi-arch is enabled, all external functions must be called via PIC PLT in PIE, which requires setting up EBX register, since they may be IFUNC functions. * config.h.in (NO_HIDDEN_EXTERN_FUNC_IN_PIE): New. * include/libc-symbols.h (__hidden_proto_hiddenattr): Add check for PIC and NO_HIDDEN_EXTERN_FUNC_IN_PIE. * sysdeps/i386/configure.ac (NO_HIDDEN_EXTERN_FUNC_IN_PIE): New AC_DEFINE if multi-arch is enabled. * sysdeps/i386/configure: Regenerated.
2017-10-03Introduce NO_RTLD_HIDDEN, make hurd use it instead of NO_HIDDENSamuel Thibault1-0/+4
On the Hurd, the rtld needs to see its own dumb versions of a few functions (defined in sysdeps/mach/hurd/dl-sysdep.c) overridden by libc's versions once loaded. rtld should thus not have hidden attribute for these. To achieve this, the Hurd port used to just define NO_HIDDEN, which disables it completely. For now, this changes that to disabling it for all rtld functions, for simplicity. See Roland's comment on https://sourceware.org/bugzilla/show_bug.cgi?id=15605#c5 The ld.so numbers remain at 8 .rel.plt 000000c8 00000c24 00000c24 00000c24 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 9 .plt 000001a0 00000cf0 00000cf0 00000cf0 2**4 CONTENTS, ALLOC, LOAD, READONLY, CODE 10 .plt.got 00000010 00000e90 00000e90 00000e90 2**3 CONTENTS, ALLOC, LOAD, READONLY, CODE 18 .got.plt 00000070 0002d000 0002d000 0002c000 2**2 CONTENTS, ALLOC, LOAD, DATA which is about 3 times as much as on Linux. The libc.so numbers get divided by 3 (the remainings are mostly RPC stub calls) * include/libc-symbols.h [NO_RTLD_HIDDEN] (rtld_hidden_proto, rtld_hidden_tls_proto, rtld_hidden_def, rtld_hidden_weak, rtld_hidden_rtld_hidden_ver, data_def, rtld_hidden_data_weak, rtld_hidden_data_ver): Define to empty. * include/assert.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__assert_fail, __assert_perror_fail): Likewise. * include/dirent.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__rewinddir): Likewise. * include/libc-internal.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__profile_frequency): Likewise. * include/setjmp.h (__sigsetjmp): Likewise. * include/signal.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__sigaction, __libc_sigaction): Likewise. * include/stdlib.h [NO_RTLD_HIDDEN] (unsetenv, __strtoul_internal): Do not set hidden attribute. * include/string.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__stpcpy, __strdup, __strerror_t, __strsep_g, memchr, memcmp, memcpy, memmove, memset, rawmemchr, stpcpy, strchr, strcmp, strlen, strnlen, strsep): Likewise. * include/sys/stat.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__fxstat, __fxstat64, __lxstat, __lxstat64, __xstat, __xstat64, __fxstatat64): Likewise. * include/sys/utsname.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__uname): Likewise. * include/sysdeps/generic/_itoa.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (_itoa_upper_digits, _itoa_lower_digits): Likewise. * sysdeps/mach/hurd/configure.ac (NO_HIDDEN): Do not set. (NO_RTLD_HIDDEN): Set. * sysdeps/mach/hurd/configure: Refresh. * config.h.in: Refresh.
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