diff --git a/compiler/rustc_codegen_llvm/src/callee.rs b/compiler/rustc_codegen_llvm/src/callee.rs index 5d68d2b77d42e..1bc924d3b90b0 100644 --- a/compiler/rustc_codegen_llvm/src/callee.rs +++ b/compiler/rustc_codegen_llvm/src/callee.rs @@ -175,7 +175,7 @@ pub fn get_fn(cx: &CodegenCx<'ll, 'tcx>, instance: Instance<'tcx>) -> &'ll Value // should use dllimport for functions. if cx.use_dll_storage_attrs && tcx.is_dllimport_foreign_item(instance_def_id) - && tcx.sess.target.env != "gnu" + && !matches!(tcx.sess.target.env.as_ref(), "gnu" | "uclibc") { llvm::LLVMSetDLLStorageClass(llfn, llvm::DLLStorageClass::DllImport); } diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs index 0bdf70b3ec488..d0c7379c2d94d 100644 --- a/compiler/rustc_middle/src/ty/layout.rs +++ b/compiler/rustc_middle/src/ty/layout.rs @@ -3012,7 +3012,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> { }; let target = &self.tcx.sess.target; - let target_env_gnu_like = matches!(&target.env[..], "gnu" | "musl"); + let target_env_gnu_like = matches!(&target.env[..], "gnu" | "musl" | "uclibc"); let win_x64_gnu = target.os == "windows" && target.arch == "x86_64" && target.env == "gnu"; let linux_s390x_gnu_like = target.os == "linux" && target.arch == "s390x" && target_env_gnu_like; @@ -3110,7 +3110,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> { if arg.layout.is_zst() { // For some forsaken reason, x86_64-pc-windows-gnu // doesn't ignore zero-sized struct arguments. - // The same is true for {s390x,sparc64,powerpc}-unknown-linux-{gnu,musl}. + // The same is true for {s390x,sparc64,powerpc}-unknown-linux-{gnu,musl,uclibc}. if is_return || rust_abi || (!win_x64_gnu diff --git a/compiler/rustc_target/src/spec/armv7_unknown_linux_uclibceabihf.rs b/compiler/rustc_target/src/spec/armv7_unknown_linux_uclibceabihf.rs new file mode 100644 index 0000000000000..d230f77bde284 --- /dev/null +++ b/compiler/rustc_target/src/spec/armv7_unknown_linux_uclibceabihf.rs @@ -0,0 +1,24 @@ +use crate::spec::{Target, TargetOptions}; + +// This target is for uclibc Linux on ARMv7 without NEON or +// thumb-mode. See the thumbv7neon variant for enabling both. + +pub fn target() -> Target { + let base = super::linux_uclibc_base::opts(); + Target { + llvm_target: "armv7-unknown-linux-gnueabihf".to_string(), + pointer_width: 32, + data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(), + arch: "arm".to_string(), + + options: TargetOptions { + // Info about features at https://wiki.debian.org/ArmHardFloatPort + features: "+v7,+vfp3,-d32,+thumb2,-neon".to_string(), + cpu: "generic".to_string(), + max_atomic_width: Some(64), + mcount: "_mcount".to_string(), + abi: "eabihf".to_string(), + ..base + }, + } +} diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs index 5276da1ba5a1c..ff5dfa3f74625 100644 --- a/compiler/rustc_target/src/spec/mod.rs +++ b/compiler/rustc_target/src/spec/mod.rs @@ -952,6 +952,8 @@ supported_targets! { ("bpfel-unknown-none", bpfel_unknown_none), ("armv6k-nintendo-3ds", armv6k_nintendo_3ds), + + ("armv7-unknown-linux-uclibceabihf", armv7_unknown_linux_uclibceabihf), } /// Warnings encountered when parsing the target `json`. diff --git a/library/std/src/sys/unix/mod.rs b/library/std/src/sys/unix/mod.rs index 1c37f4ee4981e..2ba6c8d830ede 100644 --- a/library/std/src/sys/unix/mod.rs +++ b/library/std/src/sys/unix/mod.rs @@ -307,6 +307,9 @@ cfg_if::cfg_if! { #[link(name = "zircon")] #[link(name = "fdio")] extern "C" {} + } else if #[cfg(all(target_os = "linux", target_env = "uclibc"))] { + #[link(name = "dl")] + extern "C" {} } } diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs index 891f3413e9138..6f4863057aba4 100644 --- a/library/std/src/sys/unix/thread.rs +++ b/library/std/src/sys/unix/thread.rs @@ -594,7 +594,8 @@ pub mod guard { Some(stackaddr - guardsize..stackaddr) } else if cfg!(all(target_os = "linux", target_env = "musl")) { Some(stackaddr - guardsize..stackaddr) - } else if cfg!(all(target_os = "linux", target_env = "gnu")) { + } else if cfg!(all(target_os = "linux", any(target_env = "gnu", target_env = "uclibc"))) + { // glibc used to include the guard area within the stack, as noted in the BUGS // section of `man pthread_attr_getguardsize`. This has been corrected starting // with glibc 2.27, and in some distro backports, so the guard is now placed at the diff --git a/library/unwind/src/lib.rs b/library/unwind/src/lib.rs index 25be9e7cc6c0c..e263780bf3879 100644 --- a/library/unwind/src/lib.rs +++ b/library/unwind/src/lib.rs @@ -63,7 +63,7 @@ cfg_if::cfg_if! { // don't want to duplicate it here. #[cfg(all( target_os = "linux", - target_env = "gnu", + any(target_env = "gnu", target_env = "uclibc"), not(feature = "llvm-libunwind"), not(feature = "system-llvm-libunwind") ))] @@ -72,7 +72,7 @@ extern "C" {} #[cfg(all( target_os = "linux", - target_env = "gnu", + any(target_env = "gnu", target_env = "uclibc"), not(feature = "llvm-libunwind"), feature = "system-llvm-libunwind" ))] diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md index 26fef88946251..bbeab598f2292 100644 --- a/src/doc/rustc/src/platform-support.md +++ b/src/doc/rustc/src/platform-support.md @@ -220,6 +220,7 @@ target | std | host | notes `armv6-unknown-netbsd-eabihf` | ? | | `armv6k-nintendo-3ds` | * | | ARMv6K Nintendo 3DS, Horizon (Requires devkitARM toolchain) `armv7-apple-ios` | ✓ | | ARMv7 iOS, Cortex-a8 +`armv7-unknown-linux-uclibceabihf` | ✓ | ? | ARMv7 Linux uClibc `armv7-unknown-freebsd` | ✓ | ✓ | ARMv7 FreeBSD `armv7-unknown-netbsd-eabihf` | ✓ | ✓ | `armv7-wrs-vxworks-eabihf` | ? | | diff --git a/src/doc/rustc/src/platform-support/armv7-unknown-linux-uclibceabihf.md b/src/doc/rustc/src/platform-support/armv7-unknown-linux-uclibceabihf.md new file mode 100644 index 0000000000000..b3a4275c6ee92 --- /dev/null +++ b/src/doc/rustc/src/platform-support/armv7-unknown-linux-uclibceabihf.md @@ -0,0 +1,66 @@ +# armv7-unknown-linux-uclibceabihf + +**Tier: 3** + +This tier supports the ARMv7 processor running a Linux kernel and uClibc-ng standard library. It provides full support for rust and the rust standard library. + +## Designated Developers + +* [@skrap](https://github.com/skrap) + +## Requirements + +This target is cross compiled, and requires a cross toolchain. You can find suitable pre-built toolchains at [bootlin](https://toolchains.bootlin.com/) or build one yourself via [buildroot](https://buildroot.org). + +## Building + +### Get a C toolchain + +Compiling rust for this target has been tested on `x86_64` linux hosts. Other host types have not been tested, but may work, if you can find a suitable cross compilation toolchain for them. + +If you don't already have a suitable toolchain, download one [here](https://toolchains.bootlin.com/downloads/releases/toolchains/armv7-eabihf/tarballs/armv7-eabihf--uclibc--bleeding-edge-2020.08-1.tar.bz2), and unpack it into a directory. + +### Configure rust + +The target can be built by enabling it for a `rustc` build, by placing the following in `config.toml`: + +```toml +[build] +target = ["armv7-unknown-linux-uclibceabihf"] +stage = 2 + +[target.armv7-unknown-linux-uclibceabihf] +# ADJUST THIS PATH TO POINT AT YOUR TOOLCHAIN +cc = "/TOOLCHAIN_PATH/bin/arm-buildroot-linux-uclibcgnueabihf-gcc" +``` + +### Build + +```sh +# in rust dir +./x.py build --stage 2 +``` + +## Building and Running Rust Programs + +To test cross-compiled binaries on a `x86_64` system, you can use the `qemu-arm` [userspace emulation](https://qemu-project.gitlab.io/qemu/user/main.html) program. This avoids having a full emulated ARM system by doing dynamic binary translation and dynamic system call translation. It lets you run ARM programs directly on your `x86_64` kernel. It's very convenient! + +To use: + +* Install `qemu-arm` according to your distro. +* Link your built toolchain via: + * `rustup toolchain link stage2 ${RUST}/build/x86_64-unknown-linux-gnu/stage2` +* Create a test program + +```sh +cargo new hello_world +cd hello_world +``` + +* Build and run + +```sh +CARGO_TARGET_ARMV7_UNKNOWN_LINUX_UCLIBCEABIHF_RUNNER="qemu-arm -L ${TOOLCHAIN}/arm-buildroot-linux-uclibcgnueabihf/sysroot/" \ +CARGO_TARGET_ARMV7_UNKNOWN_LINUX_UCLIBCEABIHF_LINKER=${TOOLCHAIN}/bin/arm-buildroot-linux-uclibcgnueabihf-gcc \ +cargo +stage2 run --target armv7-unknown-linux-uclibceabihf +```