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system emulation booting elf files [was: Re: [Qemu-devel] Open Hack'Ware

From: Karel Gardas
Subject: system emulation booting elf files [was: Re: [Qemu-devel] Open Hack'Ware question]
Date: Fri, 15 Jul 2005 22:17:46 +0200 (CEST)

On Thu, 14 Jul 2005, Brian Wheeler wrote:

On Thu, 2005-07-14 at 17:52 +0200, Karel Gardas wrote:
On Thu, 14 Jul 2005, Brian Wheeler wrote:

All of the websites that are referred to in the docs and source are
missing.  Is there another place to get it?  I'm tinkering with the idea
to try to boot aix on qemu.

The same here! But for RTEMS and Mesquite cPCI (MCP750) BSP.

Any idea how to get such code booting? IMHO the best would be to use
Qemu's -kernel option, but I don't know what are precise requirement for
it and for image booting in this scenario.

I've thought about it a little bit, but since I'm not system programmer, I'm a bit lost. RTEMS executables (whole system image) are ordinary elf files:

silence:~/cvs/rtems/examples/hello_world_c/o-optimize$ file hello.exe
hello.exe: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically 
linked, stripped

(i.e. hello.exe is whole RTEMS kernel and user app built together)

for example GRUB is able to boot such file and when booting it prints something like:
[Multiboot-elf, <0x100000; 0x4e538:0xbe28  (and probably something other
                                            which I've not caught since
                                            RTEMS booted quickly)

So what's IMHO needed is just elf load such file and start it. Perhaps here is possible to use em86/qemu's elfload functionality and instead of linux-user more hook this into the system mode.

Any idea how to proceed? (or where exactly to start?)

Karel Gardas                  address@hidden
ObjectSecurity Ltd.           http://www.objectsecurity.com

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