objcopy

I need to change a couple of variables in a compiled ELF file. Trying to explain this clearly I'll use a simple C struct as an example. The single source file is compiled and linked (@ 0x1000) into MyFile.elf from MyFile.c: typedef struct { uint32_t SerialNumber; /* Increments for every time it's programmed */ uint32_t PartNumber; /* Always the same */ char ProdDateTime[32]; /* "YYYY-MM-DD HH:MM:SS" date/time when programmed */ uint32_t CalcCrc32; /* Checksum of the above data */ } MyData_T; const MyData_T MyData = { /* SerialNumber */ 0x11111111, /* PartNumber */ 0x12345678, /* ProdDateTime

I compiled a Hello World C file and need just one section (only the hello world function) of it. The compiled file has the format elf32-i386 and contains 4 sections: .rodata , .text.hello , .comment , .eh_frame . I tried to use objcopy to extract only the .text.hello section: http://www.thegeekstuff.com/2013/01/objcopy-examples/ example 3. It fails, reporting: BFD: hello_new: symbol `.rodata' required but not present objcopy:hello_new: No symbols How to solve it? Peter Teoh First, you mentioned you need only the the .text section - for the purpose of runtime execution? That is not right: if

I am tying to use objcopy to include a binary form of a text file into an executable. (At runtime I need the file as a string). This works fine until the linker needs to find the references from the symbol names. The problem is that objcopy prepends the symbol names with the pathname to the file. Since I am using GNU Autotools to ship the package this prepended pathname changes and I don't know what external linker symbol to use in the C/C++ program. nm libtest.a |grep textfile textfile.o: 00001d21 D _binary__home_git_textfile_end 00001d21 A _binary__home_git_textfile_size 00000000 D _binary_

Im having problems when I define global variables in a basic C program for an ARM9 processor. I'm using EABI GNU compiler and the binary generated from a 12KB elf is 4GB! I assume the issue is with my scatter file but Im having trouble getting my head around it. I have 256KB of ROM (base address 0xFFFF0000) and 32KBs of RAM (base 0x01000000) SECTIONS { . = 0xFFFF0000; .text : { * (vectors); * (.text); } .rodata : { *(.rodata) } . = 0x01000000; sbss = .; .data : { *(.data) } .bss : { *(.bss) } ebss = .; bssSize = ebss - sbss; } And my program is as follows: int a=10; int main() { int b=5; b =

I would like to rename symbols inside object files (.o) with something that would be the Mac equivalent of binutils' objcopy --redefine-syms tool. I found no arm-apple-darwin10-objcopy . I tried the MacPorts' arm-elf-binutils port and also tried to play a bit with otool and segedit without much success. Any ideas please? synthesizerpatel Sounds like a job for Agner Fog's objconv . From the announcement : I have now finished making full support for Mach-O files in the object file converter mentioned in my previous posts. You may use it as a replacement for the missing objcopy utility. Objconv

I've just started learning some ARM programming and I've got stuck in a slightly annoying problem. The toolchain I'm using to compile my sources is Sourcery CodeBench Lite 2013.05-23 (can be found here: https://sourcery.mentor.com/GNUToolchain/release2449 ) What I would need is to tell GCC or LD or OBJCOPY to put the compiled bytecode of the 'main' function at the beginning of the .text section. Is there any way to achieve this? (maybe through a linker script?) Thank you Solved the problem. For whoever faces it: When compiling with GCC, add the -ffunction-sections option in the command-line.