similar to: [LLVMdev] LLVM and dynamic binary translator

Hello List, I am a newbie regarding LLVM and need some information on LLVM. I am working on dynamic binary translation and I am looking into if LLVM can be used for the purpose. The goal here is to generate highly optimized translated (host) code from target code. I have following questions. 1. Can LLVM be used in a dynamic binary translator? Dynamic translator translators target code for an

Hi, (Redirect me to a more appropriate mailing list if need be) For a class project, I intend to write a binary translator for Qemu using LLVM. My plan (still forming) is to implement a frontend that will convert DEC Alpha instructions into LLVM IR which can then be optimized and run through whatever backends LLVM has to arrive at optimized native code. This was done as a GSoC project in 2007

Hi Arabinda, > 1. Can LLVM be used in a dynamic binary translator? Dynamic translator > translators target code for an architecture (say PPC) to host code (say x86) > and execute it. There has been some discussion about this within the past two months on this list, IIRC. You should try searching the archives for that discussion. IIRC, the outcome is that transforming binary code into

Hi Eric, I'm currently writing an IA-32 to LLVMIR translator. I'm only mid way through, but I can certainly say that there have been more difficulties than I anticipated when I began! I think that it is a reasonable approach, perhaps especially in your case, since you have an emulator already. Automatic static translation is equivalent to the halting problem for IA-32 code, though

Paper for LLVM publication list @ http://llvm.org/pubs/ "Generalized Just-In-Time Trace Compilation using a Parallel Task Farm in a Dynamic Binary Translator" Igor Böhm, Tobias J.K. Edler von Koch, Stephen Kyle, Björn Franke, and Nigel Topham ACM SIGPLAN Conference on Programming Language Design and Implementation (PLDI), June 2011. DOI-URL: http://dx.doi.org/10.1145/1993498.1993508

First, is there a way to search the archives for this list ? I apologize in advance if I have stepped on a FAQ. My goal is to execute legacy binary machine code from a very old one of a kind computer on a variety of modern computers. I already wrote an emulator for the legacy machine that executes the old machine code. However, my emulator is just an interpreter and therefore has

Hello, > If anybody has an idea of how to fix this (other than using another > version of gcc because I am sick of compiling), I would appreciate. I > can offer backtraces or shell access if anybody is interested, just > ask me what you need. This was fixed couple of months ago. Please consider using current svn top of tree, not 2.3 release. -- WBR, Anton Korobeynikov

2008/9/21 Anton Korobeynikov <asl at math.spbu.ru>: > Hello, > >> If anybody has an idea of how to fix this (other than using another >> version of gcc because I am sick of compiling), I would appreciate. I >> can offer backtraces or shell access if anybody is interested, just >> ask me what you need. > This was fixed couple of months ago. Please consider

Hi, Oscar > at all, it would be great if you reflect your changes on the file list > inside the corresponding CMakeLists.txt when you add, remove or rename a > .cpp file. Isn't is possible for cmake just to glob everything in the corresponding directory? -- WBR, Anton Korobeynikov

Hi, Chris > If the assembler is a limitation, the best solution would be to add a > direct PECOFF writer. There is a start of direct ELF and Macho writers > already in the tree. They are not production quality, but could be a > useful place to start looking. Well, maybe. But in any case I doubt there will be 'open' support for CV debug format :) -- WBR, Anton

Hello, Chuck > I've had a look at the stubs before and I think I'm circumventing them > in the example program since I populate the table and compile the > functions in the order so that things never need to be done lazily, but > I'll look further. Well, anyway stubs are definitely wrong from windows64 and this should be fixed, otherwise funny stuff can happen from time to

Hello, John > One of the things I noticed in the last message on llvm-qemu was that > you were compiling with output from qemu with llvm-gcc? Is this correct? No. QEMU itself has some sort of IR. However, this IR is exposed only indirectly (mostly at *build* time of QEMU). The procedure of QEMU's binary code translation is the following: 1. BB is disassembled and converted to QEMU

Hello, Kevin > build process I described in my original message. So the difference is > more subtle; maybe a difference in the layout of structs or something. Also, there can be another ABI differences. > llvmoutput.c:17976: warning: pointer targets in passing argument 1 of > 'longjmp' differ in signedness Hrm, are you using setjmp/longjmp stuff? They're definitely not

Hello, Kevin. > Well, I already use custom includes with these options: "-nostdlib > -nostdinc -Ipsptoolchain/psp/include > -Ipsptoolchain/lib/gcc/psp/4.1.0/include". But that seems not enough. > GCC has some target-specific behaviour compiled in? Well, in general - yes. However, I'm not sure up to which margin. -- WBR, Anton Korobeynikov

Hello, Bill > This merge should go *much* more smoothly than the last merge -- it > could hardly be worse, right? ;-) I already did a test compile of > llvm-test with the patch and it compiled the programs without a > problem. Devang is currently testing it as well so that I have a > second opinion. One thing, which we already saw: please carefully check, that you won't

Hello, Oscar > Anyways, if there is no Mercurial or Bazaar mirrors available, I will > try git. Recommendations on which one to use welcomed. There is git mirror at repo.or.cz: http://repo.or.cz/w/llvm.git, llvm-gcc & clang mirrors are available there as well. I'm updating it 'by hands' currently due to some reasons, so sometimes it will need 2-3 days for changes in llvm

Hi, > (2) on alpha, gcc 4.2.4. The "unknown component name: alphacodegen" > didn't use to occur. My fault, I'll fix it. The problem is that lli wants to link in JIT module, which does not exist for these targets. -- WBR, Anton Korobeynikov

On Mon, Sep 29, 2008 at 12:05 PM, OvermindDL1 <overminddl1 at gmail.com> wrote: > On Mon, Sep 29, 2008 at 9:01 AM, Duncan Sands <baldrick at free.fr> wrote: >> libgcc is also available for windows. > Really? What license? What restrictions? Any speed impact over the > VC runtimes? Don't mix VC runtime and libgcc. These are totally different libraries for doing

I went ahead and tried to translate my legacy machine language into IR. Legacy branch instructions have me stumped. The branch instructions are already resolved to destination addresses in the legacy machine code. For example, there is an instruction that performs an unconditional branch to the address stored in legacy register B1. I can represent register B1 as a local variable: %B1

Hi, I'm thinking of using LLVM for translating x86 binaries into LLVM IR and performing further analysis based on the IR. The tool llvm-mc works great for disassembling hex values. However, is there any way to translate the disassembled machine code into LLVM IR and analyze them? Any suggestion/help is greatly appreciated. Thanks! - Beng