Add LoongArch support for ELF

[loongson-zn]

Add LoongArch support for ELF, please review, thanks!

[loongson-zn]

Reference Material：binutils-gdb and LoongArch ELF ABI specification

[romainthomas]

Looks good :) Thank you. Would you have sample(s) for the test-suite?

[loongson-zn]

[zhangna@localhost LIEF-2]$ arch
loongarch64
[zhangna@localhost LIEF-2]$ python3
Python 3.9.9 (main, Apr  6 2023, 00:00:00) 
[GCC 10.3.1] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import lief
>>> la=lief.parse("/bin/ls")
>>> print(len(la.segments))
9
>>> print(len(la.sections))
27
>>> ll=lief.parse("/home/zhangna/LIEF-2/build/examples/cpp/elf_reader")
>>> print(len(ll.dynamic_symbols))
248
>>> print(len(ll.segments))
10
>>> print(len(ll.sections))
30

All outputs are correct. Are there any other tests that must be done?

[romainthomas]

I would like to include the binary you are using in the test suite, could you please point me out to get them?

[loongson-zn]

You says ‘/home/zhangna/LIEF-2/build/examples/cpp/elf_reader’ ？ This binary generated by LIEF compilation.

[zhangna@localhost LIEF-2]$ pwd      ##git clone xx.LIEF  source
/home/zhangna/LIEF-2
[zhangna@localhost LIEF-2]$ mkdir build && cd build
[zhangna@localhost build]$ cmake ..  && make
[zhangna@localhost c]$ pwd
/home/zhangna/LIEF-2/build/examples/c
[zhangna@localhost c]$ ls
CMakeFiles  cmake_install.cmake  elf_reader  macho_reader  Makefile  pe_reader
[zhangna@localhost c]$ file elf_reader 
elf_reader: ELF 64-bit LSB executable, LoongArch, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-loongarch-lp64d.so.1, BuildID[sha1]=9090e305a462509d2ffc61f468a5dd1e08b083ac, for GNU/Linux 5.10.0, not stripped
[zhangna@localhost cpp]$ pwd
/home/zhangna/LIEF-2/build/examples/cpp
[zhangna@localhost cpp]$ ls
abstract_reader      dex_reader          elf_strip      Makefile               vdex_reader
art_reader           elf_add_section     elf_symbols    oat_reader
benchmark            elf_builder         logging        pe_authenticode_check
CMakeFiles           elf_reader          macho_builder  pe_builder
cmake_install.cmake  elf_section_rename  macho_reader   pe_reader

I upload the compilation directory -- build directory

[romainthomas]

You says ‘/home/zhangna/LIEF-2/build/examples/cpp/elf_reader’ ？ This binary generated by LIEF compilation.

I meant: You introduce the support for a new architecture. Thus, we need a binary with this new architecture for the unit tests. The build directory you pointed you contains such binaries so it's fine. Thank you!