Does this occur with gcc-built world and/or kernel? You could put
some printf()s in sendsig(), and there are KTR tracepoints already
present. The code assumes a fully aligned user stack, which should be
correct, but may not be.
- Justin
On Jan 31, 2016, at 6:41 PM, Mark Millard wrote:
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"
