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[DO NOT MERGE] nix-based build system!
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‎flake.nix‎

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@@ -45,6 +45,14 @@
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];
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};
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in {
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legacyPackages.sw = let
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rules = import ./rules {inherit pkgs;};
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common = pkgs.callPackage sw/c/common {inherit rules;};
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demo = pkgs.callPackage sw/c/demo {inherit rules common;};
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in {
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inherit common demo;
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};
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devShells.default = pkgs.mkShellNoCC {
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name = "labenv";
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buildInputs = with pkgs; [

‎rules/cc.nix‎

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{
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pkgs,
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lib,
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stdenv,
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toolchain ? {
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cc = "/no-toolchain-defined";
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cflags = [];
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ld = "/no-toolchain-defined";
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ldflags = [];
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asm = "/no-toolchain-defined";
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asmflags = [];
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},
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}: let
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include = {
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src,
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deps ? [],
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}:
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pkgs.runCommandLocal (builtins.baseNameOf src) {} ''
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mkdir -p $out/include
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ARGS=()
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for dep in $deps; do
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if [ -d $dep/include ]; then
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ln -s $src/include/* $out/include/
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fi
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done
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ln -s ${src} $out/include/${builtins.baseNameOf src}
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'';
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# If a raw file path is specified, turn that into a header derivation.
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autowrap_header = f:
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if !(builtins.isPath f)
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then f
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else if lib.hasSuffix ".h" f
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then include {src = f;}
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else throw "unknown file type: ${f}";
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# Turn all raw file paths into derivations.
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# Files will be grouped so that source files can depend on header files.
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autowrap_deps = deps: let
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src = builtins.filter (f: builtins.isPath f && !(lib.hasSuffix ".h" f)) deps;
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other = builtins.filter (f: !(builtins.isPath f) || lib.hasSuffix ".h" f) deps;
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wrapped = map autowrap_header other;
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src_drv =
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map (
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f:
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if lib.hasSuffix ".S" f
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then
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asm {
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src = f;
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deps = wrapped;
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}
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else if lib.hasSuffix ".c" f
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then
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object {
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src = f;
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deps = wrapped;
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}
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else throw "unknown file type: ${f}"
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)
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src;
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in
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src_drv ++ wrapped;
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asm = {
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src,
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deps ? [],
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extra-asmflags ? [],
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asmflags ? toolchain.asmflags ++ extra-asmflags,
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}:
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stdenv.mkDerivation {
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name = (lib.removeSuffix ".S" (builtins.baseNameOf src)) + ".o";
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inherit src asmflags;
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inherit (toolchain) asm;
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deps = autowrap_deps deps;
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dontUnpack = true;
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buildPhase = ''
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ARGS=()
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for dep in $deps; do
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if [ -d $dep/include ]; then
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ARGS+=(-I$dep/include)
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fi
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done
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mkdir -p $out/obj
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$asm $asmflags -c -o $out/obj/$name $src ''${ARGS[@]}
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'';
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};
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object = {
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src,
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deps ? [],
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extra-cflags ? [],
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cflags ? toolchain.cflags ++ extra-cflags,
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}:
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stdenv.mkDerivation {
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name = (lib.removeSuffix ".c" (builtins.baseNameOf src)) + ".o";
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inherit src cflags;
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inherit (toolchain) cc;
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deps = autowrap_deps deps;
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dontUnpack = true;
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buildPhase = ''
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ARGS=()
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for dep in $deps; do
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if [ -d $dep/include ]; then
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ARGS+=(-I$dep/include)
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fi
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done
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mkdir -p $out/obj
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$cc $cflags -c -o $out/obj/$name $src ''${ARGS[@]}
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'';
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};
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static = {
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name,
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deps,
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}:
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stdenv.mkDerivation {
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inherit name;
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srcs = autowrap_deps deps;
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dontUnpack = true;
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buildPhase = ''
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ARGS=()
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for src in $srcs; do
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if [ -d $src/obj ]; then
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ARGS+=($src/obj/*)
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fi
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if [ -d $src/include ]; then
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mkdir -p $out/include
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ln -s $src/include/* $out/include/
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fi
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done
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mkdir -p $out/lib
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ar rcs $out/lib/$name ''${ARGS[@]}
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'';
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};
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binary = {
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name,
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deps ? [],
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extra-ldflags ? [],
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ldflags ? toolchain.ldflags ++ extra-ldflags,
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}:
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stdenv.mkDerivation {
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inherit name ldflags;
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inherit (toolchain) ld;
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srcs = autowrap_deps deps;
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dontUnpack = true;
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buildPhase = ''
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ARGS=()
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for src in $srcs; do
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if [ -d $src/obj ]; then
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ARGS+=($src/obj/*)
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fi
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if [ -d $src/lib ]; then
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ARGS+=($src/lib/*)
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fi
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done
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mkdir -p $out/bin
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$ld $ldflags -o $out/bin/$name ''${ARGS[@]}
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'';
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};
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set = deps:
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pkgs.symlinkJoin {
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name = "";
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paths = autowrap_deps deps;
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};
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in {
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inherit asm include object static binary set;
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}

‎rules/default.nix‎

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{pkgs}: {
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cc = pkgs.callPackage ./cc.nix {};
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}

‎sw/c/common/default.nix‎

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{
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rules,
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pkgs,
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lowrisc-toolchain-gcc-rv32imcb,
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}: let
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toolchain = rec {
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cc = "${lowrisc-toolchain-gcc-rv32imcb}/bin/riscv32-unknown-elf-gcc";
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cflags = ["-march=rv32imc" "-mabi=ilp32" "-mcmodel=medany" "-Wall" "-fvisibility=hidden" "-ffreestanding"];
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ld = cc;
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ldflags = ["-nostartfiles" "-T" "${../../common/link.ld}"];
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asm = cc;
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asmflags = ["-march=rv32imc"];
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};
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rules_cc = rules.cc.override {
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inherit toolchain;
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};
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passthru = with rules_cc; rec {
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inherit toolchain rules_cc;
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crt0 = asm {
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src = ./crt0.S;
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deps = [./demo_system_regs.h];
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};
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gpio = object {
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src = ./gpio.c;
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deps = [./gpio.h ./uart.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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extra-cflags = ["-O3"];
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};
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uart = object {
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src = ./uart.c;
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deps = [./gpio.h ./uart.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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};
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pwm = object {
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src = ./pwm.c;
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deps = [./gpio.h ./uart.h ./pwm.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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};
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spi = object {
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src = ./spi.c;
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deps = [./gpio.h ./uart.h ./spi.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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};
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timer = object {
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src = ./timer.c;
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deps = [./gpio.h ./uart.h ./timer.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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};
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demo_system = object {
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src = ./demo_system.c;
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deps = [./gpio.h ./uart.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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};
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common = static {
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name = "common.a";
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deps = [crt0 gpio uart pwm spi timer ./demo_system.c] ++ [./gpio.h ./uart.h ./timer.h ./spi.h ./pwm.h ./dev_access.h ./demo_system.h ./demo_system_regs.h];
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};
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};
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in
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passthru.common // passthru

‎sw/c/demo/default.nix‎

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{
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rules,
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common,
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lowrisc-toolchain-gcc-rv32imcb,
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}:
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with common.rules_cc; {
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hello_world = binary {
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name = "hello_world";
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deps = [hello_world/main.c common];
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};
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}

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