I was wondering if there was history behind VDS64_HAS_DESCRIPTORS and in what cases would one want to turn them on? (Note, I'm assuming they are an implementation of Function Descriptors. [1])
arch/powerpc/include/asm/vdso.h unsets the macro: /* Define if 64 bits VDSO has procedure descriptors */ #undef VDS64_HAS_DESCRIPTORS so I don't believe they are ever used by default -- in this case V_FUNCTION_BEGIN doesn't add to the .opd section with .name, .TOC base, etc. Manually setting VDS64_HAS_DESCRIPTORS results in a vdso64.so in which binutils tools like readelf properly report functions with symbol type FUNC instead of NOTYPE. Are there pieces of the build/etc toolchain unprepared for function descriptors? I'm just trying to figure out why the code defaults to unsetting them. Thanks, -- Joe [1] http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-DES