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https://github.com/ahgamut/rust-ape-example.git
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update for fat APE
This commit is contained in:
Gautham
parent
3856d18fdf
commit
6b540df45d
5 changed files with 104 additions and 57 deletions
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@ -1,3 +1,7 @@
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[unstable]
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build-std-features = [""]
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build-std = ["libc", "panic_abort", "std"]
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[profile.dev]
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panic = "abort"
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opt-level = "s"
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87
README.md
87
README.md
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@ -10,9 +10,8 @@ and it builds around 175 example programs, including those that use Rust's
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> [here](https://github.com/ahgamut/ripgrep/tree/cosmopolitan).
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To build this repo you need a recent version of `gcc` (9 or 10 ought to be
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good), a recent version of `binutils` (`ld.bfd` and `objcopy`), and `bash`
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because I wrote a simple filter script.
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To build this repo you need a recent version of the Cosmopolitan Libc monorepo,
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and `bash` because I wrote a simple filter script.
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I created a [custom compilation target][custom-target] for Rust, called
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`x86_64-unknown-linux-cosmo`, to provide a build process that uses the
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@ -26,17 +25,23 @@ this method.
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## Building a Rust APE with the `std` crate
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1. Download the Cosmopolitan Libc [amalgamation][amalg-download] into the `libcosmo` folder:
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1. Download the Cosmopolitan Libc repo and build the toolchain:
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```bash
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cd libcosmo
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wget https://justine.lol/cosmopolitan/cosmopolitan.zip
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unzip cosmopolitan.zip
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cd ../
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git clone https://github.com/jart/cosmopolitan
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cd cosmopolitan
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make -j MODE= toolchain
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make -j MODE=aarch64 toolchain
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export COSMO=$(realpath ./)
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cd ..
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```
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For reference, I used the nightly version of `cosmopolitan.a` from September 12
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2022, which can be built from source if needed from [this commit][cosmo-nightly].
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Then clone this repo
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```bash
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git clone https://github.com/ahgamut/rust-ape-example
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cd rust-ape-example
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```
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2. Download the necessary host toolchain and source code for Rust:
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@ -51,49 +56,47 @@ rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-musl
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For reference, this worked when I tried it for `nightly-x86_64-linux-gnu` and:
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* the Rust binaries on June 22 2022 (5750a6aa2 2022-06-20)
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* the Rust binaries on June 25 2022 (fdca237d5 2022-06-24)
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* the Rust binaries on June 26 2022 (20a6f3a8a 2022-06-25)
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* the Rust binaries on June 30 2022 (ddcbba036 2022-06-29)
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* the Rust binaries on July 27 2022 (4d6d601c8 2022-07-26)
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* the Rust binaries on September 6 2022 (78a891d36 2022-09-06)
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* the Rust binaries on October 10 2023
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3. run `cargo build` to get the debug executable. This uses a bash script that
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removes unnecessary linker arguments. A recent version of `gcc` and `ld.bfd`
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is required.
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3. run `cargo build` to get the debug executables. This uses a bash script that
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removes unnecessary linker arguments.
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```bash
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cargo +nightly build -Zbuild-std=libc,panic_abort,std -Zbuild-std-features="" --target=./x86_64-unknown-linux-cosmo.json
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export ARCH=x86_64
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cargo +nightly build --target=./x86_64-unknown-linux-cosmo.json
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export ARCH=aarch64
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cargo +nightly build --target=./aarch64-unknown-linux-cosmo.json
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```
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For reference, I used the below versions of `gcc` and `ld.bfd`
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```
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gcc (Debian 10.2.1-6) 10.2.1 20210110
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Copyright (C) 2020 Free Software Foundation, Inc.
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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```
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```
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GNU ld (GNU Binutils for Debian) 2.35.2
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Copyright (C) 2020 Free Software Foundation, Inc.
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This program is free software; you may redistribute it under the terms of
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the GNU General Public License version 3 or (at your option) a later version.
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This program has absolutely no warranty.
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```
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4. run `objcopy` on the debug binary to obtain the APE:
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4. run `apelink` on the debug binaries to obtain the fat APE:
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```bash
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# look at the built debug binaries
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ls ./target/x86_64-unknown-linux-cosmo/debug/*.com.dbg
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# objcopy is the same version as ld.bfd above
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objcopy -SO binary ./target/x86_64-unknown-linux-cosmo/debug/hello_world.com.dbg ./hello_world.com
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# apelink
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MODE=
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MODE_AARCH64=aarch64
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APELINK=$COSMO/o/tool/build/apelink.com
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apelinkpls () {
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OUTPUT="$1"
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OUTPUT_X86_64="$2"
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OUTPUT_AARCH64="$3"
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"$APELINK" -l "$COSMO/o/$MODE/ape/ape.elf" \
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-l "$COSMO/o/$MODE_AARCH64/ape/ape.elf" \
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-M "$COSMO/ape/ape-m1.c" \
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-o "$OUTPUT" \
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"$OUTPUT_X86_64" \
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"$OUTPUT_AARCH64"
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}
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apelinkpls ./hello.com\
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./target/x86_64-unknown-linux-cosmo/debug/hello_world.com.dbg\
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./target/aarch64-unknown-linux-cosmo/debug/hello_world.com.dbg
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# run the APE
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./hello_world.com
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# see syscalls made by the APE
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./hello_world.com --strace
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./hello.com
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```
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Now we have Actually Portable Executables built with Rust! I also built a few
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51
aarch64-unknown-linux-cosmo.json
Normal file
51
aarch64-unknown-linux-cosmo.json
Normal file
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@ -0,0 +1,51 @@
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{
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"llvm-target": "aarch64-unknown-linux-musl",
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"target-pointer-width": "64",
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"arch": "aarch64",
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"data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
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"os":"linux",
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"env": "musl",
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"panic-strategy":"abort",
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"requires-uwtable":false,
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"dynamic-linking": false,
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"executables": true,
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"exe-suffix": ".com.dbg",
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"emit-debug-gdb-scripts":false,
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"crt-static-default": true,
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"crt-static-respected": false,
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"linker-is-gnu":true,
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"allows-weak-linkage":true,
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"has-rpath": false,
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"has-thread-local": false,
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"is-builtin": false,
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"trap-unreachable":true,
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"position-independent-executables": false,
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"static-position-independent-executables": false,
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"relocation-model": "static",
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"disable-redzone":true,
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"frame-pointer":"always",
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"requires-lto":false,
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"eh-frame-header":false,
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"no-default-libraries":true,
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"max-atomic-width":64,
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"linker-flavor":"gcc",
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"linker": "./gcc-linker-wrapper.bash",
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"late-link-args": {
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"gcc": []
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},
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"pre-link-args": {
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"gcc": [
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"-static"
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]
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},
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"post-link-args": {
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"gcc": [
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]
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},
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"stack-probes": {
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"kind": "none"
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},
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"target-family": [
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"unix"
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]
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}
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@ -1,21 +1,18 @@
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#!/bin/bash
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set -eu
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COSMO="${COSMO:-/opt/cosmo}"
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ARCH="${ARCH:-x86_64}"
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declare -a args
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args=()
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for o in "$@" ; do
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case $o in
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"-lunwind") continue;;
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"-lutil") continue;;
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"-lrt") continue;;
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"-lc") continue;;
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"-lm") continue;;
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"-lpthread") continue;;
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"-lgcc") continue;;
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"-Wl,-Bdynamic") continue;;
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"-Wl,-Bstatic") continue;;
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esac
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args+=("$o")
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done
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gcc "${args[@]}"
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$COSMO/bin/$ARCH-unknown-cosmo-cc "${args[@]}"
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"pre-link-args": {
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"gcc": [
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"-static",
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"-nostdinc",
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"-nostdlib",
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"-pg",
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"-mnop-mcount"
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]
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},
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"post-link-args": {
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"gcc": [
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"-Wl,--gc-sections",
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"-fuse-ld=bfd",
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"-Wl,-T,./libcosmo/ape.lds",
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"./libcosmo/crt.o",
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"./libcosmo/ape-no-modify-self.o",
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"./libcosmo/cosmopolitan.a"
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]
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},
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"stack-probes": {
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