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. --- libavutil/aarch64/asm.S | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libavutil/aarch64/asm.S b/libavutil/aarch64/asm.S index 5c329430fd..3ac2ba0d52 100644 --- a/libavutil/aarch64/asm.S +++ b/libavutil/aarch64/asm.S @@ -32,6 +32,10 @@ # define FUNC # #endif +#ifndef __has_feature +# define __has_feature(x) 0 +#endif + .macro function name, export=0, align=2 .macro endfunc ELF .size \name, . - \name @@ -94,7 +98,11 @@ ELF .size \name, . - \name add \rd, \rd, :lo12:\val+(\offset) .endif #elif CONFIG_PIC +# if __has_feature(hwaddress_sanitizer) + adrp \rd, :pg_hi21_nc:\val+(\offset) +# else adrp \rd, \val+(\offset) +# endif add \rd, \rd, :lo12:\val+(\offset) #else ldr \rd, =\val+\offset -- 2.23.0.rc1.153.gdeed80330f-goog _______________________________________________ ffmpeg-devel mailing list email@example.com https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".