https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64435
--- Comment #20 from clyon at gcc dot gnu.org --- (In reply to Jakub Jelinek from comment #14) > > https://github.com/torvalds/linux/blob/master/arch/arm64/include/asm/memory.h > https://github.com/torvalds/linux/blob/master/arch/arm64/Kconfig > reveals that aarch64 can be on Linux configured to support 39, 42 or 48 bits > virtual address space. The current libsanitizer/asan/ and > gcc/config/aarch64/aarch64.c (aarch64_asan_shadow_offset) seems to be okay > only for the 39 bits virtual address space, while Fedora/RHEL apparently use > 42 bits VA. Wonder if aarch64 couldn't use a layout closer to what x86_64 > uses for asan, with shadow offset low 0x7fff8000, which is flexible to > different sizes of the virtual address space. Thanks for pointing that, I wasn't aware of it when I worked on the initial port. My platform had 39 bits virtual address space, and I didn't notice there were other possibilities.
