[LLVMdev] LLVM JIT on a Baremetal x86 Machine !!!
james.molloy at arm.com
Wed Oct 26 08:20:16 CDT 2011
I have actually done this. I wrote a safe bytecode which compiles down to
LLVM IR, and had baremetal applications running using it.
My method was to compile for hosted linux, then modify the resulting code to
run baremetal. For me, this involved rewriting "syscall" instructions to
"int $X" as everything was running in supervisor mode and "syscall" only
works from user mode.
Apart from that there's just a load of stubs to implement. Pretty easy
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Mian M. Hamayun
Sent: 26 October 2011 14:12
To: llvmdev at cs.uiuc.edu
Subject: [LLVMdev] LLVM JIT on a Baremetal x86 Machine !!!
I have tested a few examples of LLVM-JIT Framework on Linux x86 Machine.
So generating functions on the fly and then executing them is OK on
linux i.e. i686-pc-linux-gnu
My question is:
Can we use the LLVM-JIT on a baremetal x86 machine ? Actually my target
is a virtual machine, and I need some dynamic code generation support. I
intend to use LLVM-JIT (if possible) for this purpose.
Furthermore if it is possible, then how much effort would be required ?
And where should I start looking for doing this kind of port.
Thanks for your help.
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