objconv makes up label names for jump targets and static data that doesn't appear in the symbol table. Hopper seems to be focused on Mac, but how does its capabilities on Windows or Linux compares with the free version of IDA for reversing x86/圆4 executables Hopper seems to have all the major features IDA has a graph view, ability to rename objects, and a Python API, yet IDA is still the standard. Ndisasm doesn't read the symbol table, so all its operands use absolute addressing. x86-64 Mach-o only supports PC-relative relocations, so you have to create position-independent code (e.g. D -disassemble-all Like -d, but disassemble the contents of all sections, not just those expected to contain instructions. WinDbg: WinDbg is a multipurposed debugger for Microsoft Windows, distributed on the web by Microsoft as part of the Debugging Tools for. ![]() This option only disassembles those sections which are expected to contain instructions. ![]() I forget if objconv does this by default. Display the assembler mnemonics for the machine instructions from objfile. Re: absolute relocations: make sure you put DEFAULT REL at the top of your file. PatchDiff2 is free and fully integrates with the latest version of IDA (6.1) on Windows and Linux. rodata and other directives like that to place data where it found it in the object file, but that's what you need. PatchDiff2 is a plugin for the IDA dissassembler that can analyze two IDB files and find the differences between both. I'm not sure how faithful objconv is with respect to emitting section. It might not actually work if any of the code depended on a specific longer-than-default encoding. Hopper is a disassembler with a very-close-to-C pseudocode decompiler that does not roundtrip with your C compiler but is quite good for examining other. Configure with -targeti586-pc-cygwin which will allow you to disassemble only MS-Windows files. See the file README in the base directory. Ndisasm doesn't understand object file formats, so it disassembles headers as machine code!įor this to have any hope of working, use a disassembler like Agner Fog's objconv which will output asm source (NASM, MASM, or GAS AT&T) which does assemble. Versions like 2.9.5.0.29 are linux specific and support for other targets is (sometimes) broken. See Where are GNU assembler instruction suffixes like ".s" in x86 "mov.s" documented?, but note that disassemblers don't support disassembling into that format. in a table of jump targets for a computed goto). Section info is typically not faithfully disassembled, so you'd need a special format designed for modify and reassembling + relinking.Īlso, instruction-lengths are a problem when code only works when padded by using longer encodings. See How to disassemble, modify and then reassemble a Linux executable?. ![]() There is no reliable way to do this with normal assembler syntax.
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