328c17af77
The call ABI for SME (Scalable Matrix Extension) requires a number of helper routines which are added to libgcc so they are tied to the compiler version instead of the libc version. See https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#sme-support-routines The routines are in shared libgcc and static libgcc eh, even though they are not related to exception handling. This is to avoid linking a copy of the routines into dynamic linked binaries, because TPIDR2_EL0 block can be extended in the future which is better to handle in a single place per process. The support routines have to decide if SME is accessible or not. Linux tells userspace if SME is accessible via AT_HWCAP2, otherwise a new __aarch64_sme_accessible symbol was introduced that a libc can define. Due to libgcc and libc build order, the symbol availability cannot be checked so for __aarch64_sme_accessible an unistd.h feature test macro is used while such detection mechanism is not available for __getauxval so we rely on configure checks based on the target triplet. Asm helper code is added to make writing the routines easier. libgcc/ChangeLog: * config/aarch64/t-aarch64: Add sources to the build. * config/aarch64/__aarch64_have_sme.c: New file. * config/aarch64/__arm_sme_state.S: New file. * config/aarch64/__arm_tpidr2_restore.S: New file. * config/aarch64/__arm_tpidr2_save.S: New file. * config/aarch64/__arm_za_disable.S: New file. * config/aarch64/aarch64-asm.h: New file. * config/aarch64/libgcc-sme.ver: New file. |
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| .. | ||
| config | ||
| soft-fp | ||
| ChangeLog | ||
| config.host | ||
| config.in | ||
| configure | ||
| configure.ac | ||
| crtstuff.c | ||
| dfp-bit.c | ||
| dfp-bit.h | ||
| divmod.c | ||
| emutls.c | ||
| enable-execute-stack-empty.c | ||
| enable-execute-stack-mprotect.c | ||
| find-symver.awk | ||
| fixed-bit.c | ||
| fixed-bit.h | ||
| fixed-obj.mk | ||
| floatunsidf.c | ||
| floatunsisf.c | ||
| floatunsitf.c | ||
| floatunsixf.c | ||
| fp-bit.c | ||
| fp-bit.h | ||
| gbl-ctors.h | ||
| gcov.h | ||
| gen-fixed.sh | ||
| generic-morestack-thread.c | ||
| generic-morestack.c | ||
| generic-morestack.h | ||
| gstdint.h | ||
| gthr-posix.h | ||
| gthr-single.h | ||
| gthr.h | ||
| hardcfr.c | ||
| libgcc-std.ver.in | ||
| libgcc2.c | ||
| libgcc2.h | ||
| libgcov-driver-system.c | ||
| libgcov-driver.c | ||
| libgcov-interface.c | ||
| libgcov-merge.c | ||
| libgcov-profiler.c | ||
| libgcov-util.c | ||
| libgcov.h | ||
| Makefile.in | ||
| memcmp.c | ||
| memcpy.c | ||
| memmove.c | ||
| memset.c | ||
| mkheader.sh | ||
| mkmap-flat.awk | ||
| mkmap-symver.awk | ||
| offloadstuff.c | ||
| shared-object.mk | ||
| siditi-object.mk | ||
| static-object.mk | ||
| strub.c | ||
| sync.c | ||
| udivhi3.c | ||
| udivmod.c | ||
| udivmodhi4.c | ||
| udivmodsi4.c | ||
| unwind-arm-common.inc | ||
| unwind-c.c | ||
| unwind-compat.c | ||
| unwind-compat.h | ||
| unwind-dw2-btree.h | ||
| unwind-dw2-execute_cfa.h | ||
| unwind-dw2-fde-compat.c | ||
| unwind-dw2-fde-dip.c | ||
| unwind-dw2-fde.c | ||
| unwind-dw2-fde.h | ||
| unwind-dw2.c | ||
| unwind-dw2.h | ||
| unwind-generic.h | ||
| unwind-pe.h | ||
| unwind-seh.c | ||
| unwind-sjlj.c | ||
| unwind.inc | ||
| vtv_end.c | ||
| vtv_end_preinit.c | ||
| vtv_start.c | ||
| vtv_start_preinit.c | ||