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What does objdump do?

Posted on August 21, 2022 by Author

What does objdump do?

objdump displays information about one or more object files. The options control what particular information to display. This information is mostly useful to programmers who are working on the compilation tools, as opposed to programmers who just want their program to compile and work.

What is ELF file used for?

In computing, the Executable and Linkable Format (ELF, formerly named Extensible Linking Format), is a common standard file format for executable files, object code, shared libraries, and core dumps.

What is Elf Linux?

ELF is the abbreviation for Executable and Linkable Format and defines the structure for binaries, libraries, and core files. The formal specification allows the operating system to interpreter its underlying machine instructions correctly.

How do I open an ELF file?

you can use readelf and objdump to read parts of an elf file. You can also use ‘hexdump filename’ to get a hexdump of the contents of a binary file (this is likely only useful if you like reading machine code or you are writing an assembler).

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What does an ELF file contain?

An elf file contains the bin information but it is surrounded by lots of other information, possible debug info, symbols, can distinguish code from data within the binary.

What is nm in Linux?

nm (name mangling) is a Unix command used to dump the symbol table and their attributes from a binary executable file (including libraries, compiled object modules, shared-object files, and standalone executables). The output from nm distinguishes between various symbol types.

What is the difference between bin and elf file?

A bin file is just the bits and bytes that go into the rom or a particular address from which you will run the program. An elf file contains the bin information but it is surrounded by lots of other information, possible debug info, symbols, can distinguish code from data within the binary.

Does macOS use ELF?

The OSX kernel is somewhat different from a Linux kernel. Well OS X does not use elf binaries, so it’s a bit like trying to run windows .exe.

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Does Macos use ELF?

What is PE and ELF?

Thus, while the ELF executable contains program headers which instruct how the data (and sections) are to be mapped into memory segments, the PE format simply maps relevant sections into memory.

What program opens ELF files?

elf file extension are Nintendo WII game files and are transferable via SD cards. You can, however, download an emulator called Dolphin to access these files on your computer.

What is the difference between bin and ELF file?

Why does objdump use the BFD filter?

The reason is that objdump sees an ELF file through a BFD filter of the world; if BFD has a bug where, say, it disagrees about a machine constant in e_flags, then the odds are good that it will remain internally consistent. The linker sees it the BFD way, objdump sees it the BFD way, GAS sees it the BFD way.

Does objdump do address-to-symbol transformation?

One thing that we can conclude so far is that objdump kindly does address-to-symbol transformation for us. Without looking into symbol table, we know that 0x08049424 is the address of global_data. There, we clearly see that it is initialized with 4.

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Why doesn’t readelf link against the BFD library?

The linker sees it the BFD way, objdump sees it the BFD way, GAS sees it the BFD way. There was need for a tool to go find out what the file actually says. This is why the readelf program does not link against the BFD library – it exists as an independent program to help verify the correct working of BFD.

What is the address of global_data in objdump?

Without looking into symbol table, we know that 0x08049424 is the address of global_data. There, we clearly see that it is initialized with 4. Please note that common executables installed by most Linux distribution has been striped out, thus there is no entry in its symbol table. It makes objdump difficult to interpret the addresses.

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