https://bugs.freedesktop.org/show_bug.cgi?id=91039
Bug ID: 91039
Summary: [d3d9] D3D9 state tracker crashes due to stack
misalignment if Mesa is compiled with -mfpmath=sse
Product: Mesa
Version: 10.6
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
Assignee: mesa-dev@lists.freedesktop.org
Reporter: xamaniqi...@gmail.com
QA Contact: mesa-dev@lists.freedesktop.org
Description:
The "Nine" D3D9 state tracker crashes when Wine loads any D3D program if Mesa
is compiled with -mfpmath=sse. This is because the Linux ABI assumes a stack
alignment to 16 bytes, whereas the Win32 ABI assumes a stack alignment to 4
bytes. This causes a stack misalignment and thus a general protection fault.
Additional information:
Also see the following external bug reports:
https://bugs.winehq.org/show_bug.cgi?id=22475
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
Specifications:
OS: Gentoo GNU/Linux x86_64
Kernel version: Linux 4.0.4-hardened-r3
Mesa version: 10.6.0
Solution:
The crashes no longer occur when Mesa's stack is realigned to 4 bytes.
Therefore, always pass -mstackrealign to CFLAGS if -mfpmath=sse is enabled;
this should probably be handled in the configure script.
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