similar to: [LLVMdev] How to compile this linux-driver like programme into .bc file?

Hi ZhenKai, Perhaps you can try to write a kernel module and compile it by using Clang first, (see http://www.faqs.org/docs/kernel/). You might be interested in this page, http://www.faqs.org/docs/kernel/x204.html which contains a Makefile used to compile a kernel module. Good Luck! Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia

Thank you, Chen! The thing is that I know the Makefile to complete that task. But what I want to know the clang command that can do that. Since the makefile will generate a .ko file while I can use the clang command "-O3-emit-llvm" to generate a corresponding .bc file so the pass can be run on that. Any help? -- 祝好！ 甄凯

I may try to use the Makefile then. When using gcc the Makefile is CC := colorgcc obj-m := hello.o KERNELDIR := /lib/modules/2.6.36.1/build PWD := $(shell pwd) modules: $(MAKE) -C $(KERNELDIR) M=$(PWD) modules #modules install: # $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install How to change it so the generating result is .bc file not the .o file? PLEASE BE KIND AND HELP ME~~ --

Dear Chen, I tried the command you told me. It turns out that clang use -I option rather then -isystem. But after I included the init.h file, it fired at me that "asm/processor.h" is not fount. Then I included that file using -I option and some other files were said not found! It's like I opened a can of worms... I can still continue to include the file that is said not found. But

Yeah, but I tried that command and error message was generated: hellomodule.c:1:10: fatal error: 'linux/init.h' file not found #include <linux/init.h> ^ 1 error generated. how to solve this problem?? Thanks! -- 祝好！ 甄凯 ------------------------------------------------------------------------------------------------------ 2012-04-12

Ok, that makes sense! That is to say, I don't need a makefile (in which to specify the path to kernel) to compile it. Just a clang command with some option will do it, right? -- 祝好！ 甄凯 ------------------------------------------------------------------------------------------------------ 2012-04-12

On 4/11/12 8:25 PM, 15102925731 wrote: > Yeah, but I tried that command and error message was generated: > > hellomodule.c:1:10: fatal error: 'linux/init.h' file not found > #include <linux/init.h> > ^ > 1 error generated. > > how to solve this problem?? Well, you do have to include all the -I and -D options so that clang can find the Linux kernel header

It's actually is .c file. I just want firstly to compile helloworldmodule.c into helloworldmodule.bc. Then I run a LLVM pass on it to do some optimization, and then I compile the modified .bc file into .ko file. So, could you tell me how to compile helloworldmodule.c into helloworldmodule.bc? I think it's not the same command "clang -O3 -emit-llvm hello.c -c -o hello.bc".

Hi, my friends I know there is a difference between compiling a linux module and a simple helloworld programme. If I compile a helloworld.c file, the command is "clang -O3 -emit-llvm hello.c -c -o hello.bc" But what the command should be if I want to compile a linux module into a .bc file? (I know it may be an easy question to you guys, but I really don't know where to find the

2012/4/10 15102925731 <zhenkaixd at 126.com> > Hi, my friends > > > I know there is a difference between compiling a linux module and a simple > helloworld programme. > If I compile a helloworld.c file, the command is > *"clang -O3 -emit-llvm hello.c -c -o hello.bc"* > But what the command should be if I want to compile a linux module into a > .bc file?

Thanks for your help and patience! Best regards, Zhen Kai At 2012-04-16 15:35:25,"陳韋任" <chenwj at iis.sinica.edu.tw> wrote: >> The thing is that I know the Makefile to complete that task. But what I want to know the clang command that can do that. Since the makefile will generate a .ko file while I can use the clang command "-O3-emit-llvm" to generate a

Hi all, I want to run a function pass on a certain .bc file. In the process, the pass will insert a check function into the .bc file. I know the .bc file is regarded as a module in LLVM. So, there are two basic steps needed to be done, 1, Use the "getOrInsertFunction"API to add a declaration of the extern "check function". 2, Use the "insertBefore"API to insert the

Objects that form the IR (functions, basic blocks, instructions) have the getParent() method that returns their paren (module for a function, basic block for a single instruction etc.) BTW, LLVM Doxygen is really helpful. It's usually the first result when you search for "LLVM <classname> class reference" On Tue, Apr 10, 2012 at 11:17 AM, 15102925731 <zhenkaixd at

Hi all, I wrote a function pass. In the pass, it ran through all the instruction that call to functions. When arriving at the exact function that I m interested in, it would insert a self-made function. Now I've finished the pass, the compilation is successful. The pass can find the function I like and can insert the CallInst to call my check function. BUT, when running the

Wow that's to much output information. Maybe I can put it in this way. Could you tell me the clang option that can include the linux kernel headers??? Something like "clang -O3 -isystem /lib/modules/`uname -r`/build/include -emit-llvm hellomodule.c -c -o hellomodule.bc" Thank you! -- 祝好！ 甄凯

Hi, Nick I think that's the question. I just don't know what's the command line that can tell clang to find the linux head file like a makefile will do. Please help me! -- 祝好！ 甄凯 ------------------------------------------------------------------------------------------------------ 2012-04-12

I figured that my opt command is wrong! How to specify the output file anyway?? if I want hello.bc to be input file and newhello.bc to be output file, is the opt command go like this? opt -load ../../../Debug+Asserts/lib/Hello.so -hello <hello.bc> -o newhello.bc ?? -- 祝好！ 甄凯

My friends, I ran a function pass on a .bc file, intending to insert a CallInst to my self-made check function. The compilation is successful. BUT after I ran that pass on the .bc file, the size of the file didn't get any bigger!! Does this mean my instrumentation work failed?? BTW the opt command I use is "opt -load ../../../Debug+Asserts/lib/Hello.so -hello <hello.bc> -o

Thank you very much! To make it simpler, I may as well just implement the self-written "check function" in C language instead of wrapping it in LLVM module. According to the hint you give me, all I need to do is as follow(?) 1. Implement the "Check function" in the check.c file; 2. Add the check function into the module(the Hello1.bc file which I will run the functionPass on)

That sounds like a good general plan, yes! Joey 2012/4/9 15102925731 <zhenkaixd at 126.com> > Thank you very much! > > To make it simpler, I may as well just implement the self-written "check > function" in C language instead of wrapping it in LLVM module. *According > to the hint you give me, all I need to do is as follow(?)* > > 1. Implement the