[RFC] Proposed changes related to the 32 bit API

[Ivan Sichmann Freitas <ivansichfreitas@xxxxxxxxx>]

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I'm sending this RFC to see if I'm not missing any important detail.
Most proposed changes here follow an approach similar to FreeBSD.

Changes:

 - create a compat/ directory to hold 32 bit specific implementations
   (syscall's signatures, 32 bit sysent vector, a specific
   syscalls.master).
 - enable loading of both types of binaries (32 and 64 bit). In FreeBSD
   there is a kern/imgact_elf.c which is included in kern/imgact_elf32.c
   and kern/imgact_elf64.c after a #define specifying the desired elf
   word size.
 - detect when loading a 32 bit binary (using a flag local to each
   process) and set the sysent vector accordingly, then execute the
   binary.

Testing will be done by using a sysent vector with callback that will
only trap the call to a syscall, to see if the detection and calling are
done correctly. Then I'll start translating each syscall and testing
them with syscall-specific tests and real programs.

I will start coding with that, so please point any mistake or suggest any
improvement.

--=20
Ivan Sichmann Freitas
GNU/Linux user #509059

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