Self-cultivation of programmers-reading notes (2)

3 What's in the target file?

3.1 Destination file format

1) executable files: PE (Windows) and ELF (Linux) are variants of the COFF format. The destination file (. obj,. o) takes the same format.

2) Dynamic link library: (Windows. Dll,linux. So)

3) Static link library: (. lib,. a)

3.2 What is the target file?

1) Benefits of partitioning data segments and code snippets: 1. The code snippet is set to read-only to prevent false writes. 2. Increase cache Hit ratio (data cache and instruction cache). 3. When multiple processes, only one piece of code saves memory.

3.3 Digging. O

1) objdump-h SIMPLE.O Print the basic information of each segment (contents means that the file actually exists)

Size SIMPLE.O The sizes of each segment

Objdump-s-D SIMPLE.O (-S individual segment hex print,-D to decompile the instruction segment)

Self-cultivation of programmers-reading notes (2)