cvs commit: src/sys/amd64/amd64 exception.S trap.c src/sys/amd64/include frame.h signal.h ucontext.h

[David Xu]

Peter Wemm wrote:

>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
>
>  
>
The change you made to ucontext.h breaks libkse. :-(

David Xu