Relocatable Program Module - Runtime Library

The Relocatable Program Module Runtime Library, or libRPM for short, is a minimal (<10KB) framework for dynamic code loading on embedded systems.

Features

• Runs on almost any little-endian 32-bit ARM CPU with a C++ compiler
• Blazing fast (loads a 10KB, ~200 relocation file in around 5ms on ARM946E-S)
• Written in pure C++ - no standard libraries required (that's right, not even libstdc++!)
• Automatically links import symbols between modules
• Supports Win32 targets for debugging/testing
• Allows for strict user-defined allocations/heap management
• File format supports arbitrary user metadata
• Slightly more storage-efficient than ELF
• Full control over relocation/symbol table stripping after load

Building libRPM

LibRPM can be built using the CMake build system. A target platform has to be defined using the RPM_PLATFORM variable, for example:

-DRPM_PLATFORM=ARMv5T

Currently, only the ARMv5T and Win32 targets are defined. LibRPM is guaranteed to build on arm-none-eabi-gcc and mingw32-gcc. The build output can then be used as a static library on the target system.

LibRPM also depends on certain ExtLib sources, wherefore it expects it to be cloned into the parent directory as follows:

- <root>
└─ libRPM
└─ ExtLib

Linking RPM executables

The stock linker suite for the RPM format is available at https://github.com/HelloOO7/RPMAuthoringTools.