[FFmpeg-devel] [PATCH v2] Add assembly support for -fsanitize=hwaddress tagged globals.

[Carl Eugen Hoyos]

Am Mi., 21. Aug. 2019 um 21:27 Uhr schrieb Peter Collingbourne
<pcc-at-google.com at ffmpeg.org>:
>
> As of LLVM r368102, Clang will set a pointer tag in bits 56-63 of the
> address of a global when compiling with -fsanitize=hwaddress. This requires
> an adjustment to assembly code that takes the address of such globals: the
> code cannot use the regular R_AARCH64_ADR_PREL_PG_HI21 relocation to refer
> to the global, since the tag would take the address out of range. Instead,
> the code must use the non-checking (_NC) variant of the relocation (the
> link-time check is substituted by a runtime check).
>
> This change makes the necessary adjustment in the movrel macro, where it is
> needed when compiling with -fsanitize=hwaddress.

Patch applied.

Thank you, Carl Eugen