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* config: Added HAVE_AARCH64_SVE_ASM for aarch64Naohiro Tamura2021-05-261-0/+28
| | | | | 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.
* configure: Check for static PIE supportSzabolcs Nagy2021-01-211-0/+4
| | | | | | | | | | | | | | 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>
* aarch64: define PI_STATIC_AND_HIDDENSzabolcs Nagy2021-01-081-0/+5
| | | | | | | AArch64 always uses pc relative access to static and hidden object symbols, but the config setting was previously missing. This affects ld.so start up code.
* aarch64: Add variant PCS lazy binding test [BZ #26798]Szabolcs Nagy2020-11-021-0/+40
| | | | | | | | | | | This test fails without bug 26798 fixed because some integer registers likely get clobbered by lazy binding and variant PCS only allows x16 and x17 to be clobbered at call time. The test requires binutils 2.32.1 or newer for handling variant PCS symbols. SVE registers are not covered by this test, to avoid the complexity of handling multiple compile- and runtime feature support cases.
* aarch64: configure check for pac-ret code generationSzabolcs Nagy2020-07-081-0/+39
| | | | | | | | | | | | | 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>
* aarch64: ensure objects are BTI compatibleSzabolcs Nagy2020-07-081-0/+2
| | | | | | | | | | | | | | | | | | | When glibc is built with branch protection (i.e. with a gcc configured with --enable-standard-branch-protection), all glibc binaries should be BTI compatible and marked as such. It is easy to link BTI incompatible objects by accident and this is silent currently which is usually not the expectation, so this is changed into a link error. (There is no linker flag for failing on BTI incompatible inputs so all warnings are turned into fatal errors outside the test system when building glibc with branch protection.) Unfortunately, outlined atomic functions are not BTI compatible in libgcc (PR libgcc/96001), so to build glibc with current gcc use 'CC=gcc -mno-outline-atomics', this should be fixed in libgcc soon and then glibc can be built and tested without such workarounds. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* aarch64: configure test for BTI supportSzabolcs Nagy2020-07-081-0/+42
| | | | | | | | | | | | | 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>
* Require autoconf 2.69H.J. Lu2014-09-291-2/+2
| | | | | | | | | | | | | | | | | | | * aclocal.m4: Require autoconf 2.69. * configure: Regenerated. * sysdeps/aarch64/configure: Likewise. * sysdeps/alpha/configure: Likewise. * sysdeps/arm/armv7/configure: Likewise. * sysdeps/arm/configure: Likewise. * sysdeps/ia64/configure: Likewise. * sysdeps/mach/configure: Likewise. * sysdeps/mips/configure: Likewise. * sysdeps/s390/configure: Likewise. * sysdeps/unix/sysv/linux/mips/configure: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/configure: Likewise. * sysdeps/alpha/configure.ac: Avoid empty lines at the end of file. * sysdeps/ia64/configure.ac: Likewise.
* Relocate AArch64 from ports to libc.Marcus Shawcroft2014-02-111-0/+174
This patch moves the AArch64 port to the main sysdeps hierarchy. The move is essentially: git mv ports/sysdeps/aarch64 sysdeps/aarch64 git mv ports/sysdeps/unix/sysv/linux/aarch64 sysdeps/unix/sysv/linux/aarch64 The README is updated and I've updated ChangeLog.aarch64 along the lines of the ARM move. The AArch64 build has been tested to confirm that there were no changes in objdump -dr output or the shared objects.
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