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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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| c++tools | ||
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