I have submitted Bug 206810 for this 11.0-CURRENT/clang380-import stack alignment problem for TARGET_ARCH=powerpc signal delivery.
=== Mark Millard markmi at dsl-only.net On 2016-Jan-31, at 6:08 AM, Roman Divacky <rdivacky at vlakno.cz> wrote: Fwiw, LLVM expect 16B aligned stack on PowerPC. On Sun, Jan 31, 2016 at 05:55:20AM -0800, Mark Millard wrote: > 3 quick FreeBSD for powerpc (32-bit) questions: > > > A) For PowerPC (32-bit) what is the stack alignment requirement by the ABI(s) > that FreeBSD targets? > > B) Are signal handlers supposed to be given that alignment? > > > I ask because signal handlers are at times begin given just 4-byte alignment > but clang 3.8.0 powerpc's code generation can depend on the alignment being > more than 4. > > clang 3.8.0 can calculate addresses by, for example, masking in a 0x4 > relative to what would need to be an aligned address with alignment 8 or more > instead of adding 0x4 to a more arbitrary address. > > So far I've only seen less than 8 byte stack alignment via signal handler > activity. > > > C) Which should be blamed for problems here: clang's code generation, > FreeBSD's stack alignment handling for signals, or both? > > === > Mark Millard > markmi at dsl-only.net > > _______________________________________________ > freebsd-toolchain@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain > To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org" _______________________________________________ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
