Re: Is it possible to make the whole image above 4G on a 64 bit machine?

[John Reiser <jreiser at bitwagon dot com>]

>>   If it's possible to make the whole image above 4G, how I can do that?
>> If not, could you explain why? Thanks.

> You must use PIE to place an executable above 4G.

There are other requirements, too, independent of using -fPIE.  Do this:
   grep R_X86_64 /usr/include/elf.h   |  grep sign
to see several of the potential problems.

Any use of the relocation type:
   #define R_X86_64_PC32           2       /* PC relative 32 bit signed */
must be within 2G of the destination.  In practice this means that
you must tell the compiler to use a different memory model if you have
more than 2GB of subroutines (.text) in a single module (executable or
shared library.)  Because this case is rare, then your favorite compiler
might not support it.

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