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Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits ta
From: |
Thiemo Seufer |
Subject: |
Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets |
Date: |
Thu, 11 Oct 2007 16:17:24 +0100 |
User-agent: |
Mutt/1.5.16 (2007-06-11) |
Fabrice Bellard wrote:
> Thiemo Seufer wrote:
>> Fabrice Bellard wrote:
>>> J. Mayer wrote:
>>>> Following the patches done for elfload32, it appeared to me that there
>>>> were still problems that would prevent 32 bits executables to run on 64
>>>> bits target in linux user mode emulation.
>>>> [...]
>>> Are you sure it is a good idea to try to add 32 bit executable support to
>>> a 64 bit target ? In the end you will need to write a 64 bit to 32 bit
>>> linux syscall converter which would mean duplicating all the linux-user
>>> code of the corresponding 32 bit target (think of ioctls with strutures,
>>> signals frames, etc...).
>> I would think this feature will be limited to platforms which can handle
>> 32bit and 64bit binaries with a single personality.
>
> I am not sure it is a common case !
>
> However, I suggest to emulate a 32 bit user linux system with a 64 bit
> guest CPU running in 32 bit compatibily mode. It would be useful to test 64
> bit CPUs in 32 bit compatibility mode. The only required modification in
> linux user is to rename target_ulong so that it can have a different size
> of the CPU word default size.
Doesn't work for MIPS64, since it doesn't quite have a compatibility mode
in the traditional sense. It needs to retain 64bit register width when
running N32 ABI binaries. (Thus the somewhat odd overrides I added for
the preliminary N32 support.)
Thiemo
- [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, J. Mayer, 2007/10/10
- Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, Blue Swirl, 2007/10/11
- Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, J. Mayer, 2007/10/11
- Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, Blue Swirl, 2007/10/12
- Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, Thiemo Seufer, 2007/10/12
- Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, Blue Swirl, 2007/10/12
- Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, Thiemo Seufer, 2007/10/12
Re: [Qemu-devel] RFC: fix run of 32 bits Linux executables on 64 bits targets, Blue Swirl, 2007/10/10