1 files changed, 45 insertions, 0 deletions
diff --git a/pkgs/development/tools/analysis/rr/zen_workaround.nix b/pkgs/development/tools/analysis/rr/zen_workaround.nix
new file mode 100644
index 00000000000..193e70d0d95
--- /dev/null
+++ b/pkgs/development/tools/analysis/rr/zen_workaround.nix
@@ -0,0 +1,45 @@
+{ stdenv, lib, fetchzip, kernel }:
+
+/* The python script shouldn't be needed for users of this kernel module.
+  https://github.com/rr-debugger/rr/blob/master/scripts/zen_workaround.py
+  The module itself is called "zen_workaround" (a bit generic unfortunately).
+*/
+stdenv.mkDerivation rec {
+  pname = "rr-zen_workaround";
+  version = "2020-09-22";
+
+  src = fetchzip {
+    url = "https://gist.github.com/glandium/01d54cefdb70561b5f6675e08f2990f2/archive/2f430f0c136a69b0886281d0c76708997d8878af.zip";
+    sha256 = "1mbmbyymgl75wparv3rgnyxnc44rd6n935jziz9anl9apy031ryi";
+  };
+
+  hardeningDisable = [ "pic" ];
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+
+  makeFlags = [
+    "-C${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+  ];
+  postConfigure = ''
+    makeFlags="$makeFlags M=$(pwd)"
+  '';
+  buildFlags = "modules";
+
+  installPhase = let
+    modDestDir = "$out/lib/modules/${kernel.modDirVersion}/kernel"; #TODO: longer path?
+  in ''
+    runHook preInstall
+    mkdir -p "${modDestDir}"
+    cp *.ko "${modDestDir}/"
+    find ${modDestDir} -name '*.ko' -exec xz -f '{}' \;
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Kernel module supporting the rr debugger on (some) AMD Zen-based CPUs";
+    homepage = "https://github.com/rr-debugger/rr/wiki/Zen#kernel-module";
+    license = licenses.gpl2;
+    maintainers = [ maintainers.vcunat ];
+    platforms = [ "x86_64-linux" ];
+    broken = versionOlder kernel.version "4.19"; # 4.14 breaks and 4.19 works
+  };
+}