Tim Ellison wrote:
Andrew Zhang wrote:
On 10/11/07, Tim Ellison <[EMAIL PROTECTED]> wrote:
Is that something we need to add to a technical FAQ?
yeah, I think it would be really helpful!
There is a (short) technical FAQ in this page:
https://svn.apache.org/repos/asf/harmony/standard/site/xdocs/faq.xml
Perhaps you could add in the symptoms and instructions for disabling the
NX bit?
Is this text ok for FAQ?
The symptom seems to be unexpected NPEs in the code that doesn't produce
any when not debugged. This is a limitation of M3 build. Hopefully it
will be fixed in M4.
On Linux ia32 NX bit is usually disabled because enabling it requires
CONFIG_X86_PAE that is needed to address over 4Gb of memory, and to turn
it on it is necessary to specify "noexec=on" on kernel command line.
On Linux x86_64 NX bit is enabled by default, so if one tries to run
DRLVM debugger in x86 emulation mode it is better to specify
"noexec=off" on kernel command line.
On Windows x86 NX bit is controlled with a /noexecute switch to kernel
command line in X:\boot.ini (X is boot drive letter) file. Usually it is
set as /noexecute=optin that disables execution of kernel but allows
execution of user level programs heap. For more details see [1]
[1] http://www.microsoft.com/technet/sysinternals/information/bootini.mspx
--
Gregory
