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Debugging

Table of contents

  1. GCC options
    1. Strip Debugging Info
  2. proc/pid/maps
  3. Core file
  4. TODO

resources:

  • https://binary.ninja/ Reversing Platform
  • https://www.godbolt.org/

GCC options

-g

include debugging information in the compiled program

-funwind-tables

It generates any needed static data for exception handling and allows a running program to walk back the function call stack from a given execution point.

Strip Debugging Info

-fomit–frame–pointer

strip(1)

proc/pid/maps

https://man7.org/linux/man-pages/man5/proc.5.html

address           perms offset  dev   inode       pathname
00400000-00452000 r-xp 00000000 08:02 173521      /usr/bin/dbus-daemon
  • perms: (s/p) shared / private
  • pseudo-paths
    • [stack]: The main thread stack
    • [stack:<tid>] (remove in Linux 4.5): A thread’s stack
    • [vdso]: virtual dynamically linked shared object
    • [heap]
    • blank: anonymous mapping

Core file

# the core filesize is limited by RLIMIT_CORE
ulimit -c unlimited

/proc/PID/coredump_filter: determine which types of memory mappings are written. See core(5)

Elf32_Ehd.e_type == ET_CORE

gdb program core
objdump -s core    # (s: full-content)
readelf -a core    # (all)

TODO

DWARF Debug With Arbitrary Record Format http://www.dwarfstd.org/

STABS debugging info http://sourceware.org/gdb/onlinedocs/stabs.html