Date: Tue, 14 Oct 2003 19:04:53 -0700 (PDT) From: Peter Wemm <peter@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/amd64/amd64 exception.S trap.c src/sys/amd64/include frame.h signal.h ucontext.h Message-ID: <200310150204.h9F24rVO015517@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
peter 2003/10/14 19:04:52 PDT
FreeBSD src repository
Modified files:
sys/amd64/amd64 exception.S trap.c
sys/amd64/include frame.h signal.h ucontext.h
Log:
Pull the tier-2 card one last time and break the get/setcontext and
sigreturn() ABI and the signal context on the stack.
Make the trapframe (and its shadows in the ucontext and sigframe etc)
8 bytes larger in order to preserve 16 byte stack alignment for the
following C code calls. I could have done some padding after the
trapframe was saved, but some of the C code still expects an argument of
'struct trapframe'. Anyway, this gives me a spare field that can be used
to store things like 'partial trapframe' status or something else in
the future.
The runtime impact is fairly small, *except* for threaded apps and things
that decode contexts and the signal stack (eg: cvsup binary). Signal
delivery isn't too badly affected because the kernel generates the
sigframe that sigreturn uses after the handler has been called.
The size of mcontext_t and struct sigframe hasn't changed. Only
the last few fields (sc_eip etc) got moved a little and I eliminated
a spare field. mc_len/sc_len did change location though so the
sanity checks there will still trap it.
Revision Changes Path
1.113 +1 -1 src/sys/amd64/amd64/exception.S
1.266 +9 -0 src/sys/amd64/amd64/trap.c
1.25 +3 -0 src/sys/amd64/include/frame.h
1.24 +2 -2 src/sys/amd64/include/signal.h
1.16 +2 -2 src/sys/amd64/include/ucontext.h
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200310150204.h9F24rVO015517>