This prologue has two parts. Setting up the stackframe This stores the current EBP register on the stack and then assigns the value of the stackpointer(ESP) to EBP. push ebp mov ebp,esp If there are local variables that are stored on the stack (i.e. not enough space in the registers available) then ESP will be … Read more
mcsema is a production-quality binary lifter. It takes x86 and x86-64 and statically “lifts” it to LLVM IR. It’s actively maintained, BSD licensed, and has extensive tests and documentation. https://github.com/trailofbits/mcsema
While you can use the -fdump-tree-all and -fdump-rtl-all options in gcc, I don’t think that their output is very useful to a compiler student. FWIW, I started working on gcc as part of my PhD studies, having already completed two undergraduate courses, and I found gcc and its debug files to be opaque and hard … Read more
Looks like the dissembler used short-hand for SAR EAX,1 which has an opcode of 0xD1F8. when the immediate is not 1, aka SAR EAX,xx, the opcode is 0xC1F8 xx, see the Intel Instruction reference, Vol. 2B, 4-353.
Actually you can do it also with dotPeek from 1.2 version onward. Right click the assembly in Assembly Explorer, and select “Generate Pdb”. It also has the option to generate files for referenced assemblies all at once.
objdump uses the DWARF debugging information compiled into the binary, which references the source file name. objdump tries to open the named source file to load the source and display it in the output. If the binary isn’t compiled with debugging information, or objdump can’t find the source file, then you don’t get source code … Read more
The instruction is loading a new EIP value from memory at ds:[40207A]. i.e. there’s a function pointer at address 40207A. (And it pushes a return address because this is a call not just a jmp.) The ds: means the instruction is referencing memory in the Data Segment – and can pretty much be ignored on … Read more
write the commands in a file and execute gdb with -x switch gdb -x command_file_name or run the gdb source command while gdb is running if you dont want to specify a command file from command line >source [-s] [-v] command_file_name
Ok, here a big edition of my previous answer. I think I found a way now. You (still 🙂 have this specific problem: (gdb) disas main No symbol table is loaded. Use the “file” command. Now, if you compile the code (I added a return 0 at the end), you will get with gcc -S: … Read more
On Windows you can use dumpbin. On Linux and friends you can use nm.