Hi Philip, Thanks for the reply.
I am trying to write a small tiny ELF loader. My idea is to generate a Relocatable ELF executable file(not object file/shared file) or a position independent code ELF executable. And Load that ELF at user specified address and run it as a seperate thread in the same process. I have implemeted a small loader code, in that it will parse the ELF file decides the size of ELF (size of all text , data, BSS sections), and allocates memory for that size, copies the ELF and starts a new thread with starting point of memory where the ELF copied. This concept is working fine. And at Test ELF side , I have tried to generate an ELF with a know RO-Base address(i.e. the address i got by malloc() in my loader module) , I copied the ELF to the same location that I gave as RO-Base address. This is Working fine. But Now i want my loader to have the ability to load a relocatable/ position independent code ELF to any address and run it as a new thread. Please give me some inputs for both LOADER part and Test ELF part(compiler and linker options for elf generation for both relocatable and PIC) Do i need to do any work in my loader like setting the CODE base register, DATA base regiset and Stack poiter etc. Thanks, Ravinder On Thu, Feb 18, 2010 at 2:13 AM, Philip Guenther <[email protected]> wrote: > On Tuesday, February 16, 2010, ravinder are <[email protected]> > wrote: > > I want to build my ELF executable as relocatable under ARM platform, > Please specify the correct compiler and linker options for this. > > And also I want load this relocatable ELF dynamically to any location, > please let me know how to load this. > > I *think* you're looking for the -pie option for compiling and linking > Position Independent Executables, but > 1) I don't know if we support PIE on ARM, and > 2) it's not completely clear what you're trying to do. > > Kurt's slides about the OpenBSD PIE implementation from, IIRC, > DCBSDcon might answer the former. Of course, only you can answer the > latter: "what problem are you trying to solve?" > > Philip Guenther >
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