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* powerpc: Update ULPs and xfail more ibm128 outputsTulio Magno Quites Machado Filho2020-04-071-16/+18
| | | | | | | There are 2 new input values that require to be marked as xfail-rounding:ibm128-libgcc as they're known to fail because of libgcc issues with different rounding modes. Otherwise, the other tests just need an increase in ULP.
* powerpc64le: enforce non-specific long double in .gnu.attributes sectionPaul E. Murphy2020-04-062-1/+56
| | | | | | | | | | | | | | | | | | | | | | | We turn off this feature to avoid polluting our shared libary with a specific value. However, static libgcc is not under our control, and has enabled this for ibm128 routines. This pollutes the resulting shared libraries with it. Attach a post-linking hook to replace this section with one crafted as hard-float + indeterminate ldbl. This allows IEEE ldbl users to avoid having to disable the gnu attributes feature which should protect them from linking ibm ldbl libraries using the gnu attributes feature. Currently, this only replaces libc and libm which support both ldbl formats and rely on application code to explicitly determine which is to be used. Strictly speaking, the section could be deleted with minimal lost value. However correctly set attributes could prove useful for some future change, and similarly missing attributes. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc64le: workaround ieee long double / _Float128 stdc++ bugPaul E. Murphy2020-04-061-0/+11
| | | | | | | | | | -mabi=ieeelongdouble triggers the stdc++ libraries _Float128 support, which then breaks if algorithm is included. For now, explicitly disable _Float128 for such tests. I have opened up GCC BZ 94080 to track this. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc64le: Enforce -mabi=ibmlongdouble when -mfloat128 usedPaul E. Murphy2020-04-062-43/+53
| | | | | | | | | | | | | | | | | | I have observed a bug on 7.4.0 whereby __mulkc3 calls are swapped with __multc3 depending on ABI selection. For the sake of being overly cautious, build all _Float128 files with ibm128 to workaround these compilers. This has been noted in GCC BZ 84914, and will not be fixed for GCC 7. Likewise, non-math files built with _Float128 are assumed to have ibm long double. Explicilty preserve this assumption. Finally, add some bootstrapping code to avoid applying these options until IEEE long double is enabled as they require GCC 7 and above. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc64le/multiarch: don't generate strong aliases for fmaf128-ppc64Paul E. Murphy2020-04-061-0/+2
| | | | | This prevents generating a second alias for __fmaieee128 when compiling with ldouble == ieee128 redirects.
* powerpc: Add support for fmaf128() in hardwareRaphael Moreira Zinsly2020-03-305-1/+127
| | | | | | | | Adds a POWER9 version of fmaf128 that uses the xsmaddqp instruction. Co-authored-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* math: Remove fenvinline.hAdhemerval Zanella2020-03-304-113/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Similar to string2.h (18b10de7ce) and string3.h (09a596cc2c) this patch removes the fenvinline.h on all architectures. Currently only powerpc implements some optimizations. This kind of optimization is better implemented by the compiler (which handles the architecture ISA transparently). Also, for the specific optimized powerpc implementation the code is becoming convoluted and these micro-optimization are hardly wildly used, even more being a possible hotspot in realword cases (non-default rounding are used only on specific cases and exception handling are done most likely only on errors path). Only x86 implements similar optimization (on fenv.h) also indicates that these should no be on libc. The math/test-fenv already covers all math/test-fenvinline tests, so it is safe to remove it. The powerpc fegetround optimization is moved to internal fenv_libc.h. The BZ#94193 [1] the corresponding GCC bug for adding replacements for these on powerpc. Checked on x86_64-linux-gnu and powerpc64le-linux-gnu. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94193
* powerpc64: apply -mabi=ibmlongdouble to special filesPaul E. Murphy2020-03-253-2/+13
| | | | | | | | | | Some of these files depend on the avoidance of using the various register sets of POWER. When enabling the IEEE 128 long double, we must be sure to disable this ABI as some compilers will refuse to compile if -mno-vsx and -mabi=ieeelongdouble are both present. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc64le: add -mno-gnu-attribute to *f128 objects and difftimePaul E. Murphy2020-03-252-9/+16
| | | | | | | | | | | | | In practice, this flag should be applied globally, but it makes a good sanity check to ensure ibm128 and ieee128 long double files are not getting mismatched. _Float128 files use no long double, thus are always safe to use this option. Similarly, when investigating the linker complaints, difftime makes trivial, self contained, usage of long double, so thus it is also explicitly marked as such. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* Makeconfig: sandwich gnulib-tests between libc/ld linking of testsPaul E. Murphy2020-03-251-17/+1
| | | | | | | This better resembles the default linking process with the gnulibs, and also resolves the increasingly difficult to maintain f128-loader-link usage on powerpc64le as some libgcc symbols are dependent on those found in the loader (ld).
* powerpc64le: Ensure correct ldouble compiler flags are usedGabriel F. T. Gomes2020-03-251-0/+58
| | | | | | | | | | | | | Ensure the correct ldouble abi flags are applied to ibm128 files and nldbl files. Remove the IEEE options if used, and apply the flags used to build ldouble files which are ibm128 abi. nldbl tests are a little tricky. To use the support, we must remove all ldouble abi flags, and ensure -mlong-double-64 is used. Co-authored-by: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> Co-authored-by: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> Co-authored-by: Paul E. Murphy <murphyp@linux.vnet.ibm.com>
* math: Remove inline math testsAdhemerval Zanella2020-03-193-2000/+1
| | | | | | | | | | | | | With mathinline removal there is no need to keep building and testing inline math tests. The gen-libm-tests.py support to generate ULP_I_* is removed and all libm-test-ulps files are updated to longer have the i{float,double,ldouble} entries. The support for no-test-inline is also removed from both gen-auto-libm-tests and the auto-libm-test-out-* were regenerated. Checked on x86_64-linux-gnu and i686-linux-gnu.
* powerpc: Fix feraiseexcept and feclearexcept macrosMatheus Castanho2020-03-061-2/+2
| | | | | | | | | | | | | | | | | A recent change to fenvinline.h modified the check if __e is a a power of 2 inside feraiseexcept and feclearexcept macros. It introduced the use of the powerof2 macro but also removed the if statement checking whether __e != 0 before issuing an mtfsb* instruction. This is problematic because powerof2 (0) evaluates to 1 and without the removed if __e is allowed to be 0 when __builtin_clz is called. In that case the value 32 is passed to __MTFSB*, which is invalid. This commit uses __builtin_popcount instead of powerof2 to fix this issue and avoid the extra check for __e != 0. This was the approach used by the initial versions of that previous patch. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc: Refactor fenvinline.hRogerio Alves2020-02-251-13/+19
| | | | | | | This patch refactor fenviline.h replaces some statements for builtins. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* Introduce <elf-initfini.h> and ELF_INITFINI for all architecturesFlorian Weimer2020-02-181-0/+20
| | | | | | | | | | | | | | | | This supersedes the init_array sysdeps directory. It allows us to check for ELF_INITFINI in both C and assembler code, and skip DT_INIT and DT_FINI processing completely on newer architectures. A new header file is needed because <dl-machine.h> is incompatible with assembler code. <sysdep.h> is compatible with assembler code, but it cannot be included in all assembler files because on some architectures, it redefines register names, and some assembler files conflict with that. <elf-initfini.h> is replicated for legacy architectures which need DT_INIT/DT_FINI support. New architectures follow the generic default and disable it.
* linux: Remove INTERNAL_SYSCALL_DECLAdhemerval Zanella2020-02-141-3/+2
| | | | | | | | | | | With all Linux ABIs using the expected Linux kABI to indicate syscalls errors, the INTERNAL_SYSCALL_DECL is an empty declaration on all ports. This patch removes the 'err' argument on INTERNAL_SYSCALL* macro and remove the INTERNAL_SYSCALL_DECL usage. Checked with a build against all affected ABIs.
* Fix array overflow in backtrace on PowerPC (bug 25423)Andreas Schwab2020-01-212-0/+4
| | | | | | When unwinding through a signal frame the backtrace function on PowerPC didn't check array bounds when storing the frame address. Fixes commit d400dcac5e ("PowerPC: fix backtrace to handle signal trampolines").
* powerpc32: Fix syntax error in __GLRO macroAndreas Schwab2020-01-181-1/+1
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* powerpc: Move cache line size to rtld_global_roTulio Magno Quites Machado Filho2020-01-1714-45/+275
| | | | | | | | | | | | | | GCC 10.0 enabled -fno-common by default and this started to point that __cache_line_size had been implemented in 2 different places: loader and libc. In order to avoid this duplication, the libc variable has been removed and the loader variable is moved to rtld_global_ro. File sysdeps/unix/sysv/linux/powerpc/dl-auxv.h has been added in order to reuse code for both static and dynamic linking scenarios. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* elf: Move vDSO setup to rtld (BZ#24967)Adhemerval Zanella2020-01-032-12/+12
| | | | | | | | | | | | | | | | | | | | | | | | This patch moves the vDSO setup from libc to loader code, just after the vDSO link_map setup. For static case the initialization is moved to _dl_non_dynamic_init instead. Instead of using the mangled pointer, the vDSO data is set as attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for static). It is read-only even with partial relro. It fixes BZ#24967 now that the vDSO pointer is setup earlier than malloc interposition is called. Also, vDSO calls should not be a problem for static dlopen as indicated by BZ#20802. The vDSO pointer would be zero-initialized and the syscall will be issued instead. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. I also run some tests on mips. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Add libm_alias_finite for _finite symbolsWilco Dijkstra2020-01-0312-22/+21
| | | | | | | | | | | | | | | | | | | This patch adds a new macro, libm_alias_finite, to define all _finite symbol. It sets all _finite symbol as compat symbol based on its first version (obtained from the definition at built generated first-versions.h). The <fn>f128_finite symbols were introduced in GLIBC 2.26 and so need special treatment in code that is shared between long double and float128. It is done by adding a list, similar to internal symbol redifinition, on sysdeps/ieee754/float128/float128_private.h. Alpha also needs some tricky changes to ensure we still emit 2 compat symbols for sqrt(f). Passes buildmanyglibc. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Update copyright dates with scripts/update-copyrights.Joseph Myers2020-01-01577-577/+577
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* powerpc: Do not run IFUNC resolvers for LD_DEBUG=unused [BZ #24214]Adhemerval Zanella2019-12-192-4/+6
| | | | | | | | | | | This patch adds the missing bits for powerpc and fixes both tst-ifunc-fault-lazy and tst-ifunc-fault-bindnow failures on powerpc-linux-gnu. Checked on powerpc-linux-gnu and powerpc-linux-gnu-power4. Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* Expand $(as-needed) and $(no-as-needed) throughout the build systemFlorian Weimer2019-12-031-1/+1
| | | | | | | | | Since commit a3cc4f48e94f32c9532ee36982ac00eb1e5719b0 ("Remove --as-needed configure test."), --as-needed support is no longer optional. The macros are not much shorter and do not provide documentary value, either, so this commit removes them.
* nptl: Add default pthreadtypes-arch.hAdhemerval Zanella2019-11-261-44/+0
| | | | | | | | | | | | | | | | | | | | | | | This patch adds a default pthreadtypes-arch.h, the idea is to simpify new ports inclusion and an override is required only if the architecture adds some arch-specific extensions or requirement. The default values on the new generic header are based on current architecture define value and they are not optimal compared to current code requirements as below. - On 64 bits __SIZEOF_PTHREAD_BARRIER_T is defined as 32 while is sizeof (struct pthread_barrier) is 20 bytes. - On 32 bits __SIZEOF_PTHREAD_ATTR_T is defined as 36 while sizeof (struct pthread_attr) is 32. The default values are not changed so the generic header could be used by some architectures. Checked with a build on affected abis. Change-Id: Ie0cd586258a2650f715c1af0c9fe4e7063b0409a
* nptl: Add struct_rwlock.hAdhemerval Zanella2019-11-262-27/+61
| | | | | | | | | | | | | | | | | | | | | | | | This patch adds a new generic __pthread_rwlock_arch_t definition meant to be used by new ports. Its layout mimics the current usage on some 64 bits ports and it allows some ports to use the generic definition. The arch __pthread_rwlock_arch_t definition is moved from pthreadtypes-arch.h to another arch-specific header (struct_rwlock.h). Also the static intialization macro for pthread_rwlock_t is set to use an arch defined on (__PTHREAD_RWLOCK_INITIALIZER) which simplifies its implementation. The default pthread_rwlock_t layout differs from current ports with: 1. Internal layout is the same for 32 bits and 64 bits. 2. Internal flag is an unsigned short so it should not required additional padding to align for word boundary (if it is the case for the ABI). Checked with a build on affected abis. Change-Id: I776a6a986c23199929d28a3dcd30272db21cd1d0
* nptl: Add struct_mutex.hAdhemerval Zanella2019-11-262-7/+63
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current way of defining the common mutex definition for POSIX and C11 on pthreadtypes-arch.h (added by commit 06be6368da16104be5) is not really the best options for newer ports. It requires define some misleading flags that should be always defined as 0 (__PTHREAD_COMPAT_PADDING_MID and __PTHREAD_COMPAT_PADDING_END), it exposes options used solely for linuxthreads compat mode (__PTHREAD_MUTEX_USE_UNION and __PTHREAD_MUTEX_NUSERS_AFTER_KIND), and requires newer ports to explicit define them (adding more boilerplate code). This patch adds a new default __pthread_mutex_s definition meant to be used by newer ports. Its layout mimics the current usage on both 32 and 64 bits ports and it allows most ports to use the generic definition. Only ports that use some arch-specific definition (such as hardware lock-elision or linuxthreads compat) requires specific headers. For 32 bit, the generic definitions mimic the other 32-bit ports of using an union to define the fields uses on adaptive and robust mutexes (thus not allowing both usage at same time) and by using a single linked-list for robust mutexes. Both decisions seemed to follow what recent ports have done and make the resulting pthread_mutex_t/mtx_t object smaller. Also the static intialization macro for pthread_mutex_t is set to use a macro __PTHREAD_MUTEX_INITIALIZER where the architecture can redefine in its struct_mutex.h if it requires additional fields to be initialized. Checked with a build on affected abis. Change-Id: I30a22c3e3497805fd6e52994c5925897cffcfe13
* nptl: Remove rwlock elision definitionsAdhemerval Zanella2019-11-261-5/+2
| | | | | | | | | | The new rwlock implementation added by cc25c8b4c1196 (2.25) removed support for lock-elision. This patch removes remaining the arch-specific unused definitions. Checked with a build against all affected ABIs. Change-Id: I5dec8af50e3cd56d7351c52ceff4aa3771b53cd6
* nptl: Add tests for internal pthread_rwlock_t offsetsAdhemerval Zanella2019-11-261-0/+6
| | | | | | | | | | | | | This patch new build tests to check for internal fields offsets for internal pthread_rwlock_t definition. Althoug the '__data.__flags' field layout should be preserved due static initializators, the patch also adds tests for the futexes that may be used in a shared memory (although using different libc version in such scenario is not really supported). Checked with a build against all affected ABIs. Change-Id: Iccc103d557de13d17e4a3f59a0cad2f4a640c148
* nptl: Cleanup mutex internal offset testsAdhemerval Zanella2019-11-261-8/+0
| | | | | | | | | | | | | The offsets of pthread_mutex_t __data.__nusers, __data.__spins, __data.elision, __data.list are not required to be constant over the releases. Only the __data.__kind is used for static initializers. This patch also adds an additional size check for __data.__kind. Checked with a build against affected ABIs. Change-Id: I7a4e48cc91b4c4ada57e9a5d1b151fb702bfaa9f
* [powerpc] No need to enter "Ignore Exceptions Mode"Paul A. Clarke2019-10-021-4/+15
| | | | | | | | | Since at least POWER8, there is no performance advantage to entering "Ignore Exceptions Mode", and doing so conditionally requires - the conditional logic, and - a system call. Make it a no-op for uses within glibc.
* Split up endian.h to minimize exposure of BYTE_ORDER.Alistair Francis2019-10-012-36/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With only two exceptions (sys/types.h and sys/param.h, both of which historically might have defined BYTE_ORDER) the public headers that include <endian.h> only want to be able to test __BYTE_ORDER against __*_ENDIAN. This patch creates a new bits/endian.h that can be included by any header that wants to be able to test __BYTE_ORDER and/or __FLOAT_WORD_ORDER against the __*_ENDIAN constants, or needs __LONG_LONG_PAIR. It only defines macros in the implementation namespace. The existing bits/endian.h (which could not be included independently of endian.h, and only defines __BYTE_ORDER and maybe __FLOAT_WORD_ORDER) is renamed to bits/endianness.h. I also took the opportunity to canonicalize the form of this header, which we are stuck with having one copy of per architecture. Since they are so short, this means git doesn’t understand that they were renamed from existing headers, sigh. endian.h itself is a nonstandard header and its only remaining use from a standard header is guarded by __USE_MISC, so I dropped the __USE_MISC conditionals from around all of the public-namespace things it defines. (This means, an application that requests strict library conformance but includes endian.h will still see the definition of BYTE_ORDER.) A few changes to specific bits/endian(ness).h variants deserve mention: - sysdeps/unix/sysv/linux/ia64/bits/endian.h is moved to sysdeps/ia64/bits/endianness.h. If I remember correctly, ia64 did have selectable endianness, but we have assembly code in sysdeps/ia64 that assumes it’s little-endian, so there is no reason to treat the ia64 endianness.h as linux-specific. - The C-SKY port does not fully support big-endian mode, the compile will error out if __CSKYBE__ is defined. - The PowerPC port had extra logic in its bits/endian.h to detect a broken compiler, which strikes me as unnecessary, so I removed it. - The only files that defined __FLOAT_WORD_ORDER always defined it to the same value as __BYTE_ORDER, so I removed those definitions. The SH bits/endian(ness).h had comments inconsistent with the actual setting of __FLOAT_WORD_ORDER, which I also removed. - I *removed* copyright boilerplate from the few bits/endian(ness).h headers that had it; these files record a single fact in a fashion dictated by an external spec, so I do not think they are copyrightable. As long as I was changing every copy of ieee754.h in the tree, I noticed that only the MIPS variant includes float.h, because it uses LDBL_MANT_DIG to decide among three different versions of ieee854_long_double. This patch makes it not include float.h when GCC’s intrinsic __LDBL_MANT_DIG__ is available. * string/endian.h: Unconditionally define LITTLE_ENDIAN, BIG_ENDIAN, PDP_ENDIAN, and BYTE_ORDER. Condition byteswapping macros only on !__ASSEMBLER__. Move the definitions of __BIG_ENDIAN, __LITTLE_ENDIAN, __PDP_ENDIAN, __FLOAT_WORD_ORDER, and __LONG_LONG_PAIR to... * string/bits/endian.h: ...this new file, which includes the renamed header bits/endianness.h for the definition of __BYTE_ORDER and possibly __FLOAT_WORD_ORDER. * string/Makefile: Install bits/endianness.h. * include/bits/endian.h: New wrapper. * bits/endian.h: Rename to bits/endianness.h. Add multiple-include guard. Rewrite the comment explaining what the machine-specific variants of this file should do. * sysdeps/unix/sysv/linux/ia64/bits/endian.h: Move to sysdeps/ia64. * sysdeps/aarch64/bits/endian.h * sysdeps/alpha/bits/endian.h * sysdeps/arm/bits/endian.h * sysdeps/csky/bits/endian.h * sysdeps/hppa/bits/endian.h * sysdeps/ia64/bits/endian.h * sysdeps/m68k/bits/endian.h * sysdeps/microblaze/bits/endian.h * sysdeps/mips/bits/endian.h * sysdeps/nios2/bits/endian.h * sysdeps/powerpc/bits/endian.h * sysdeps/riscv/bits/endian.h * sysdeps/s390/bits/endian.h * sysdeps/sh/bits/endian.h * sysdeps/sparc/bits/endian.h * sysdeps/x86/bits/endian.h: Rename to endianness.h; canonicalize form of file; remove redundant definitions of __FLOAT_WORD_ORDER. * sysdeps/powerpc/bits/endianness.h: Remove logic to check for broken compilers. * ctype/ctype.h * sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h * sysdeps/arm/nptl/bits/pthreadtypes-arch.h * sysdeps/csky/nptl/bits/pthreadtypes-arch.h * sysdeps/ia64/ieee754.h * sysdeps/ieee754/ieee754.h * sysdeps/ieee754/ldbl-128/ieee754.h * sysdeps/ieee754/ldbl-128ibm/ieee754.h * sysdeps/m68k/nptl/bits/pthreadtypes-arch.h * sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h * sysdeps/mips/ieee754/ieee754.h * sysdeps/mips/nptl/bits/pthreadtypes-arch.h * sysdeps/nios2/nptl/bits/pthreadtypes-arch.h * sysdeps/nptl/pthread.h * sysdeps/riscv/nptl/bits/pthreadtypes-arch.h * sysdeps/sh/nptl/bits/pthreadtypes-arch.h * sysdeps/sparc/sparc32/ieee754.h * sysdeps/unix/sysv/linux/generic/bits/stat.h * sysdeps/unix/sysv/linux/generic/bits/statfs.h * sysdeps/unix/sysv/linux/sys/acct.h * wctype/bits/wctype-wchar.h: Include bits/endian.h, not endian.h. * sysdeps/unix/sysv/linux/hppa/pthread.h: Don’t include endian.h. * sysdeps/mips/ieee754/ieee754.h: Use __LDBL_MANT_DIG__ in ifdefs, instead of LDBL_MANT_DIG. Only include float.h when __LDBL_MANT_DIG__ is not predefined, in which case define __LDBL_MANT_DIG__ to equal LDBL_MANT_DIG.
* [powerpc] Rename fesetenv_mode to fesetenv_controlPaul A. Clarke2019-09-275-6/+6
| | | | | | | fesetenv_mode is used variously to write the FPSCR exception enable bits and rounding mode bits. These are referred to as the control bits in the POWER ISA. Change the name to be reflective of its current and expected use, and match up well with fegetenv_control.
* [powerpc] libc_feholdsetround_noex_ppc_ctx: optimize FPSCR writePaul A. Clarke2019-09-271-1/+1
| | | | | | | | | | | | libc_feholdsetround_noex_ppc_ctx currently performs: 1. Read FPSCR, save to context. 2. Create new FPSCR value: clear enables and set new rounding mode. 3. Write new value to FPSCR. Since other bits just pass through, there is no need to write them. Instead, write just the changed values (enables and rounding mode), which can be a bit more efficient.
* [powerpc] Rename fegetenv_status to fegetenv_controlPaul A. Clarke2019-09-277-9/+9
| | | | | | | | | | | fegetenv_status is used variously to retrieve the FPSCR exception enable bits, rounding mode bits, or both. These are referred to as the control bits in the POWER ISA. FPSCR status bits are also returned by the 'mffs' and 'mffsl' instructions, but they are uniformly ignored by all uses of fegetenv_status. Change the name to be reflective of its current and expected use. Reviewed-By: Paul E Murphy <murphyp@linux.ibm.com>
* [powerpc] __fesetround_inline optimizationsPaul A. Clarke2019-09-271-3/+15
| | | | | | | | | On POWER9, use more efficient means to update the 2-bit rounding mode via the 'mffscrn' instruction (instead of two 'mtfsb0/1' instructions or one 'mtfsfi' instruction that modifies 4 bits). Suggested-by: Paul E. Murphy <murphyp@linux.ibm.com> Reviewed-By: Paul E Murphy <murphyp@linux.ibm.com>
* [powerpc] libc_feupdateenv_test: optimize FPSCR accessPaul A. Clarke2019-09-272-2/+18
| | | | | | | | | | | | ROUND_TO_ODD and a couple of other places use libc_feupdateenv_test to restore the rounding mode and exception enables, preserve exception flags, and test whether given exception(s) were generated. If the exception flags haven't changed, then it is sufficient and a bit more efficient to just restore the rounding mode and enables, rather than writing the full Floating-Point Status and Control Register (FPSCR). Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
* [powerpc] fenv_private.h clean upPaul A. Clarke2019-09-278-117/+38
| | | | | | | | | | | fenv_private.h includes unused functions, magic macro constants, and some replicated common code fragments. Remove unused functions, replace magic constants with constants from fenv_libc.h, and refactor replicated code. Suggested-by: Paul E. Murphy <murphyp@linux.ibm.com> Reviewed-By: Paul E Murphy <murphyp@linux.ibm.com>
* [powerpc] SET_RESTORE_ROUND optimizations and bug fixPaul A. Clarke2019-09-192-25/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SET_RESTORE_ROUND brackets a block of code, temporarily setting and restoring the rounding mode and letting everything else, including exceptions generated within the block, pass through. On powerpc, the current code clears the exception enables, which will hide exceptions generated within the block. This issue was introduced by me in commit e905212627350d54b58426214b5a54ddc852b0c9. Fix this by not clearing exception enable bits in the prologue. Also, since we are no longer changing the enable bits in either the prologue or the epilogue, there is no need to test for entering/exiting non-stop mode. Also, optimize the prologue get/save/set rounding mode operations for POWER9 and later by using 'mffscrn' when possible. Suggested-by: Paul E. Murphy <murphyp@linux.ibm.com> Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com> Fixes: e905212627350d54b58426214b5a54ddc852b0c9 2019-09-19 Paul A. Clarke <pc@us.ibm.com> * sysdeps/powerpc/fpu/fenv_libc.h (fegetenv_and_set_rn): New. (__fe_mffscrn): New. * sysdeps/powerpc/fpu/fenv_private.h (libc_feholdsetround_ppc_ctx): Do not clear enable bits, remove obsolete code, use fegetenv_and_set_rn. (libc_feresetround_ppc): Remove obsolete code, use fegetenv_and_set_rn.
* Refactor vDSO initialization codeAdhemerval Zanella2019-09-172-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linux vDSO initialization code the internal function pointers require a lot of duplicated boilerplate over different architectures. This patch aims to simplify not only the code but the required definition to enable a vDSO symbol. The changes are: 1. Consolidate all init-first.c on only one implementation and enable the symbol based on HAVE_*_VSYSCALL existence. 2. Set the HAVE_*_VSYSCALL to the architecture expected names string. 3. Add a new internal implementation, get_vdso_mangle_symbol, which returns a mangled function pointer. Currently the clock_gettime, clock_getres, gettimeofday, getcpu, and time are handled in an arch-independent way, powerpc still uses some arch-specific vDSO symbol handled in a specific init-first implementation. Checked on aarch64-linux-gnu, arm-linux-gnueabihf, i386-linux-gnu, mips64-linux-gnu, powerpc64le-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and x86_64-linux-gnu. * sysdeps/powerpc/powerpc32/backtrace.c (is_sigtramp_address, is_sigtramp_address_rt): Use HAVE_SIGTRAMP_{RT}32 instead of SHARED. * sysdeps/powerpc/powerpc64/backtrace.c (is_sigtramp_address): Likewise. * sysdeps/unix/sysv/linux/aarch64/init-first.c: Remove file. * sysdeps/unix/sysv/linux/aarch64/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/arm/init-first.c: Likewise. * sysdeps/unix/sysv/linux/arm/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/mips/init-first.c: Likewise. * sysdeps/unix/sysv/linux/mips/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/i386/init-first.c: Likewise. * sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise. * sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/s390/init-first.c: Likewise. * sysdeps/unix/sysv/linux/s390/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/sparc/init-first.c: Likewise. * sysdeps/unix/sysv/linux/sparc/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/x86/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/x86_64/init-first.c: Likewise. * sysdeps/unix/sysv/linux/aarch64/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Define value based on kernel exported name. * sysdeps/unix/sysv/linux/arm/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/i386/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/mips/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/powerpc/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETCPU_VSYSCALL, HAVE_TIME_VSYSCALL, HAVE_GET_TBFREQ, HAVE_SIGTRAMP_RT64, HAVE_SIGTRAMP_32, HAVE_SIGTRAMP_RT32i, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/riscv/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/s390/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/sparc/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/x86_64/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise. * sysdeps/unix/sysv/linux/dl-vdso.h (VDSO_NAME, VDSO_HASH): Define to invalid names if architecture does not define them. (get_vdso_mangle_symbol): New symbol. * sysdeps/unix/sysv/linux/init-first.c: New file. * sysdeps/unix/sysv/linux/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/init-first.c (gettimeofday, clock_gettime, clock_getres, getcpu, time): Remove declaration. (__libc_vdso_platform_setup_arch): Likewise and use get_vdso_mangle_symbol to setup vDSO symbols. (sigtramp_rt64, sigtramp32, sigtramp_rt32, get_tbfreq): Add attribute_hidden. * sysdeps/unix/sysv/linux/powerpc/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/sysdep-vdso.h (VDSO_SYMBOL): Remove definition.
* Fix three GNU license URLs, along with trailing-newline issues.Paul Eggert2019-09-071-2/+1
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* Prefer https to http for gnu.org and fsf.org URLsPaul Eggert2019-09-07575-575/+575
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
* [powerpc] fegetenv_status: simplify instruction generationPaul A. Clarke2019-08-281-15/+6
| | | | | | | | | | | | | | fegetenv_status() wants to use the lighter weight instruction 'mffsl' for reading the Floating-Point Status and Control Register (FPSCR). It currently will use it directly if compiled '-mcpu=power9', and will perform a runtime check (cpu_supports("arch_3_00")) otherwise. Nicely, it turns out that the 'mffsl' instruction will decode to 'mffs' on architectures older than "arch_3_00" because the additional bits set for 'mffsl' are "don't care" for 'mffs'. 'mffs' is a superset of 'mffsl'. So, just generate 'mffsl'.
* [powerpc] fesetenv: optimize FPSCR accessPaul A. Clarke2019-08-281-8/+4
| | | | | | | | | | | | | | fesetenv() reads the current value of the Floating-Point Status and Control Register (FPSCR) to determine the difference between the current state of exception enables and the newly requested state. All of these bits are also returned by the lighter weight 'mffsl' instruction used by fegetenv_status(). Use that instead. Also, remove a local macro _FPU_MASK_ALL in favor of a common macro, FPU_ENABLES_MASK from fenv_libc.h. Finally, use a local variable ('new') in favor of a pointer dereference ('*envp').
* [powerpc] SET_RESTORE_ROUND improvementsPaul A. Clarke2019-08-281-2/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SET_RESTORE_ROUND uses libc_feholdsetround_ppc_ctx and libc_feresetround_ppc_ctx to bracket a block of code where the floating point rounding mode must be set to a certain value. For the *prologue*, libc_feholdsetround_ppc_ctx is used and performs: 1. Read/save FPSCR. 2. Create new value for FPSCR with new rounding mode and enables cleared. 3. If new value is different than current value, a. If transitioning from a state where some exceptions enabled, enter "ignore exceptions / non-stop" mode. b. Write new value to FPSCR. c. Put a mark on the wall indicating the FPSCR was changed. (1) uses the 'mffs' instruction. On POWER9, the lighter weight 'mffsl' instruction can be used, but it doesn't return all of the bits in the FPSCR. fegetenv_status uses 'mffsl' on POWER9, 'mffs' otherwise, and can thus be used instead of fegetenv_register. (3b) uses 'mtfsf 0b11111111' to write the entire FPSCR, so it must instead use 'mtfsf 0b00000011' to write just the enables and the mode, because some of the rest of the bits are not valid if 'mffsl' was used. fesetenv_mode uses 'mtfsf 0b00000011' on POWER9, 'mtfsf 0b11111111' otherwise. For the *epilogue*, libc_feresetround_ppc_ctx checks the mark on the wall, then calls libc_feresetround_ppc, which just calls __libc_femergeenv_ppc with parameters such that it performs: 1. Retreive saved value of FPSCR, saved in prologue above. 2. Read FPSCR. 3. Create new value of FPSCR where: - Summary bits and exception indicators = current OR saved. - Rounding mode and enables = saved. - Status bits = current. 4. If transitioning from some exceptions enabled to none, enter "ignore exceptions / non-stop" mode. 5. If transitioning from no exceptions enabled to some, enter "catch exceptions" mode. 6. Write new value to FPSCR. The summary bits are hardwired to the exception indicators, so there is no need to restore any saved summary bits. The exception indicator bits, which are sticky and remain set unless explicitly cleared, would only need to be restored if the code block might explicitly clear any of them. This is certainly not expected. So, the only bits that need to be restored are the enables and the mode. If it is the case that only those bits are to be restored, there is no need to read the FPSCR. Steps (2) and (3) are unnecessary, and step (6) only needs to write the bits being restored. We know we are transitioning out of "ignore exceptions" mode, so step (4) is unnecessary, and in step (6), we only need to check the state we are entering.
* [powerpc] fe{en,dis}ableexcept, fesetmode: optimize FPSCR accessesPaul A. Clarke2019-08-284-24/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Since fe{en,dis}ableexcept() and fesetmode() read-modify-write just the "mode" (exception enable and rounding mode) bits of the Floating Point Status Control Register (FPSCR), the lighter weight 'mffsl' instruction can be used to read the FPSCR (enables and rounding mode), and 'mtfsf 0b00000011' can be used to write just those bits back to the FPSCR. The net is better performance. In addition, fe{en,dis}ableexcept() read the FPSCR again after writing it, or they determine that it doesn't need to be written because it is not changing. In either case, the local variable holds the current values of the enable bits in the FPSCR. This local variable can be used instead of again reading the FPSCR. Also, that value of the FPSCR which is read the second time is validated against the requested enables. Since the write can't fail, this validation step is unnecessary, and can be removed. Instead, the exceptions to be enabled (or disabled) are transformed into available bits in the FPSCR, then validated after being transformed back, to ensure that all requested bits are actually being set. For example, FE_INVALID_SQRT can be requested, but cannot actually be set. This bit is not mapped during the transformations, so a test for that bit being set before and after transformations will show the bit would not be set, and the function will return -1 for failure. Finally, convert the local macros in fesetmode.c to more generally useful macros in fenv_libc.h.
* [powerpc] fe{en,dis}ableexcept optimize bit translationsPaul A. Clarke2019-08-283-33/+63
| | | | | | | | | | | The exceptions passed to fe{en,dis}ableexcept() are defined in the ABI as a bitmask, a combination of FE_INVALID, FE_OVERFLOW, etc. Within the functions, these bits must be translated to/from the corresponding enable bits in the Floating Point Status Control Register (FPSCR). This translation is currently done bit-by-bit. The compiler generates a series of conditional bit operations. Nicely, the "FE" exception bits are all a uniform offset from the FPSCR enable bits, so the bit-by-bit operation can instead be performed by a shift with appropriate masking.
* Declare most TS 18661-1 interfaces for C2X.Joseph Myers2019-08-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | C2X adds the interfaces from TS 18661-1, and all except a handful in Annex F are unconditionally visible in C2X rather than only visible when __STDC_WANT_IEC_60559_BFP_EXT__ is defined. This patch updates glibc headers accordingly: most uses of __GLIBC_USE (IEC_60559_BFP_EXT) are changed to a new __GLIBC_USE (IEC_60559_BFP_EXT_C2X). (Regarding totalorder and totalordermag, the type-generic macros in tgmath.h will go away when the functions are changed to take pointer arguments.) * bits/libc-header-start.h (__GLIBC_USE_IEC_60559_BFP_EXT): Update comment. (__GLIBC_USE_IEC_60559_BFP_EXT_C2X): New macro. * bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Change to [__GLIBC_USE (IEC_60559_BFP_EXT_C2X)]. * include/limits.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * math/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * stdlib/bits/stdlib-ldbl.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * stdlib/stdint.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * stdlib/stdlib.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/aarch64/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/alpha/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/arm/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/csky/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/hppa/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/ia64/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/m68k/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/microblaze/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/mips/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/nios2/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/powerpc/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/riscv/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/s390/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/sh/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/sparc/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * sysdeps/x86/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise. * math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise, except for totalorder, totalordermag, getpayload, setpayload and setpayloadsig. * math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)]: Likewise, except for totalorder and totalordermag.
* powerpc: Cleanup: use actual power8 assembly mnemonicsRaoni Fassina Firmino2019-08-0111-187/+87
| | | | | | | | | | | | | | | | | | | | | | Some implementations in sysdeps/powerpc/powerpc64/power8/*.S still had pre power8 compatible binutils hardcoded macros and were not using .machine power8. This patch should not have semantic changes, in fact it should have the same exact code generated. Tested that generated stripped shared objects are identical when using "strip --remove-section=.note.gnu.build-id". Checked on: - powerpc64le, power9, build-many-glibcs.py, gcc 6.4.1 20180104, binutils 2.26.2.20160726 - powerpc64le, power8, debian 9, gcc 6.3.0 20170516, binutils 2.28 - powerpc64le, power9, ubuntu 19.04, gcc 8.3.0, binutils 2.32 - powerpc64le, power9, opensuse tumbleweed, gcc 9.1.1 20190527, binutils 2.32 - powerpc64, power9, debian 10, gcc 8.3.0, binutils 2.31.1 Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
* [powerpc] fenv_libc.h: protect use of __builtin_cpu_supportsPaul A. Clarke2019-07-091-1/+3
| | | | | | | | | | | | | Using __builtin_cpu_supports() requires support in GCC and Glibc. My recent patch to fenv_libc.h added an unprotected use of __builtin_cpu_supports(). Compilation of Glibc itself will fail with a sufficiently new GCC and sufficiently old Glibc: ../sysdeps/powerpc/fpu/fegetexcept.c: In function ‘__fegetexcept’: ../sysdeps/powerpc/fpu/fenv_libc.h:52:20: error: builtin ‘__builtin_cpu_supports’ needs GLIBC (2.23 and newer) that exports hardware capability bits [-Werror] Reviewed-by: Florian Weimer <fweimer@redhat.com> Fixes 3db85a9814784a74536a1f0e7b7ddbfef7dc84bb.
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-09 19:55:36 +0000