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[Qemu-devel] Need some helps

From: Qiang Guan
Subject: [Qemu-devel] Need some helps
Date: Thu, 26 Mar 2015 15:38:13 -0600


I am working on the old version QEMU which is still using dyngen with my own constraints. I want to know how I can get the guest instruction to intermediate code mapping. Are there any docs? 

For example:

For this guest instruction
add [ebp + 0x08], edx 

It will be split into multiple micro-ops:
movl A0 ebp 
addl A0 0x0c 
addl A0 ss.base 
movl T1 edx 
ldl_raw T0 A0 
addl T0 T1 
stl_raw T0 A0 

My question is how I can  get the guest instruction to micron-ops mapping. If I have a "cmpl" guest instruction, how can I find the mapping micro-ops in intermediate code?

Another question is that when I run 32bits Guest VM, I can only allocate up to 2 GB not 4 GB. Are there any special reasons for this design?


- Qiang

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