Category: Debugging & Memory

General Calling conventions specify the low-level details for function calls. They are a part of an ABI. Comparison System V

Coredump Reasoning It fails to get the value at “0x4(%r8)”, because it’s outside the own memory segments. The value of

Introduction With static linking, the position of the code of the static libs are exactly known during compile time. This

Scenario Application code Print frame script Analysis GDB session Frame 0 0x7fffffffe240: 0x0000555555554040 0x0000000300000008 0x7fffffffe250: 0x0000000000000000 0x0000000b00000000 0x7fffffffe260: 0x00007fffffffe280 0x000055555555518e

Showcase Debugging $ g++ -g main.cpp $ gdb a.out (gdb) b main.cpp:5 if i == 5 Breakpoint 1 at 0xa24:

Example code Without pretty printer (gdb) b 29 (gdb) r Breakpoint 1, main () at main.cpp:29 29 return 0; (gdb)

Mechanism 1. Frame pointers … the old default way Frame pointers are enabled by default. Strong optimization (“-O2”, “-O3”) will

Instructions Purpose x64 (Intel flavor) A64 Copy content (dst = src) MOV RAX, RBX MOV X0, X1 Copy content (dst