Add ELF with ARM Cortex-M profile

[tnias]

Having free test binaries for things like rizinorg/rizin#3747 may be useful.

% readelf -A arm/elf/pico_serprog.elf
Attribute Section: aeabi
File Attributes
  Tag_CPU_name: "6S-M"
  Tag_CPU_arch: v6S-M
  Tag_CPU_arch_profile: Microcontroller
  Tag_THUMB_ISA_use: Thumb-1
  Tag_ABI_PCS_wchar_t: 4
  Tag_ABI_FP_denormal: Needed
  Tag_ABI_FP_exceptions: Needed
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_enum_size: small

To the best of my knowledge the binary is licensed: GPL-3.0-only AND MIT AND BSD-3-Clause

Steps to reproduce the binary (click spoiler)

On a x86_64-linux system with nix write this code in a default.nix.

{
  lib,
  stdenvNoCC,
  fetchFromGitea,
  cmake,
  gcc-arm-embedded,
  picotool,
  python3,
  pico-sdk,
}:

let
  # We need tinyusb and it is one of pico-sdk's submodules.
  pico-sdk-with-submodules = pico-sdk.override { withSubmodules = true; };
in
stdenvNoCC.mkDerivation (finalAttrs: {
  pname = "pico-serprog";
  version = "20250212";

  src = fetchFromGitea {
    domain = "codeberg.org";
    owner = "Riku_V";
    repo = "pico-serprog";
    tag = finalAttrs.version;
    hash = "sha256-1Fo4g57vk4u5u1Q+Yrx/co8CE8/NxZDJdwIFQ+51f1Q=";
  };

  nativeBuildInputs = [
    cmake
    gcc-arm-embedded
    picotool
    python3
  ];

  buildInputs = [
    pico-sdk-with-submodules
  ];

  cmakeFlags = [
    "-DPICO_SDK_PATH=${pico-sdk-with-submodules}/lib/pico-sdk"
    "-DPICO_COMPILER=pico_arm_cortex_m0plus_gcc"
    "-DCMAKE_C_COMPILER=${gcc-arm-embedded}/bin/arm-none-eabi-gcc"
    "-DCMAKE_CXX_COMPILER=${gcc-arm-embedded}/bin/arm-none-eabi-g++"
  ];

  dontFixup = true;

  installPhase = ''
    install -m 0444 -D -t $out/etc/udev/rules.d $src/99-serprog.rules
    install -m 0444 -D -t $out/share/pico-serprog pico_serprog.uf2
    install -m 0444 -D -t $out/share/pico-serprog pico_serprog.elf
    install -m 0444 -D -t $out/share/doc/pico-serprog $src/pinout.png
  '';

  meta = {
    description = "Raspberry Pi Pico serprog";
    homepage = "https://codeberg.org/Riku_V/pico-serprog";
    license = with lib.licenses; [
      cc-by-sa-40
      gpl3Only
      mit
    ];
    platforms = lib.platforms.all;
  };
})

Then build it with this command.

nix-build --expr '
with import (builtins.fetchTarball {
  url = "https://github.com/nixos/nixpkgs/archive/5912c1772a44e31bf1c63c0390b90501e5026886.tar.gz";
  sha256 = "1kk6dr0d9hpc0pfsb24dpvn7cnvwnyc9fnj1pbkd55phyzfdsg9j";
}) {};
callPackage ./default.nix {}
'

[Rot127]

For what PR is this?

[tnias]

A while back I looked at and rebased the patchset of the abandoned PR that attempted to solve rizinorg/rizin#3747. But at the time I have not seen relevant cortex-m elfs in rizin-testbins.

So this is not really for an already existing PR. I just thought it would be useful to have for potential future PRs. :)

Are new binaries only accepted when they are accompanied with a PR on the main repo? Should I close this?

[wargio]

it would be nice to have this info outputted by iH

[Rot127]

Are new binaries only accepted when they are accompanied with a PR on the main repo?

We have no policy or something about this, but I'd say yes. The repo is already huge. No need to add unused binaries.

As @wargio suggested. You can open a PR and just print the info with iH to see if it sets the correct cpu.