src/lib/libc/amd64/gen/makecontext.c, branch release/7.0.0_cvs FreeBSD source tree This commit was manufactured by cvs2svn to create tag 2008-02-24T05:45:17+00:00 cvs2svn cvs2svn@FreeBSD.org 2008-02-24T05:45:17+00:00 a9c219fa3cec18ef9f30edec6fa106bf0e2d423d 'RELENG_7_0_0_RELEASE'. This commit was manufactured to restore the state of the 7.0-RELEASE image. 
'RELENG_7_0_0_RELEASE'.

This commit was manufactured to restore the state of the 7.0-RELEASE image.
1. Use correct alignment mask, -15 != ~15 2004-07-31T01:41:41+00:00 David Xu davidxu@FreeBSD.org 2004-07-31T01:41:41+00:00 d3c6a920f1aaafdab6708ef32923afc88f0292e9 2. Make end of frames 
2. Make end of frames
Fix Yet Another 16 byte stack alignment bug. Thankfully, this one is 2004-03-31T07:27:31+00:00 Peter Wemm peter@FreeBSD.org 2004-03-31T07:27:31+00:00 372603334815d131e18bf23d6d7e740a5485fd82 solved by a simple 'make world'. The signalcontext function was going to the trouble of generating an even 16 byte alignment, but in fact it needed to be odd aligned to simulate the 8-byte return address having been pushed by the caller. This fixes yet another group of crashes in applications using libpthread. And yet again, it was my fault all along. While here, rename the duplicate internal ctx_wrapper() functions to makectx_wrapper() and sigctx_wrapper() so that traces aren't ambiguous. 
solved by a simple 'make world'.  The signalcontext function was going
to the trouble of generating an even 16 byte alignment, but in fact it
needed to be odd aligned to simulate the 8-byte return address having
been pushed by the caller.  This fixes yet another group of crashes in
applications using libpthread.  And yet again, it was my fault all along.

While here, rename the duplicate internal ctx_wrapper() functions to
makectx_wrapper() and sigctx_wrapper() so that traces aren't ambiguous.
"Fix" makecontext() so that the C code begins execution with its 2003-12-05T01:36:44+00:00 Peter Wemm peter@FreeBSD.org 2003-12-05T01:36:44+00:00 04cb6b3aa6b5510707e141f00c75103c16f16744 ABI-required stack alignment. C code expects that the push of the return address disturbed the 16 byte alignment and it will take corrective measures to fix it before making another call. Of course, if its wrong to start with, then all hell breaks loose. Essentially we "fix" this by making the stack alignment odd to start with. This was one of the things that broke on libkse with apps that use floating point/varargs/etc. Approved by: re (scottl) 
ABI-required stack alignment.  C code expects that the push of the
return address disturbed the 16 byte alignment and it will take corrective
measures to fix it before making another call.  Of course, if its wrong
to start with, then all hell breaks loose.  Essentially we "fix" this
by making the stack alignment odd to start with.

This was one of the things that broke on libkse with apps that use
floating point/varargs/etc.

Approved by:  re (scottl)
Add amd64 versions of makecontext() and signalcontext() needed 2003-07-19T04:41:08+00:00 Daniel Eischen deischen@FreeBSD.org 2003-07-19T04:41:08+00:00 4adc354c34875629d93a549e0fc98880d9f97c80 for libkse (makecontext() is also needed for libthr). These probably will need some tweaking. 
for libkse (makecontext() is also needed for libthr).
These probably will need some tweaking.