diff options
| -rw-r--r-- | compiler/rustc_target/src/spec/mod.rs | 1 | ||||
| -rw-r--r-- | compiler/rustc_target/src/spec/targets/aarch64_be_unknown_none_softfloat.rs | 43 | ||||
| -rw-r--r-- | src/bootstrap/src/core/sanity.rs | 1 | ||||
| -rw-r--r-- | src/doc/rustc/src/SUMMARY.md | 1 | ||||
| -rw-r--r-- | src/doc/rustc/src/platform-support.md | 1 | ||||
| -rw-r--r-- | src/doc/rustc/src/platform-support/aarch64_be-unknown-none-softfloat.md | 74 | ||||
| -rw-r--r-- | tests/assembly-llvm/targets/targets-elf.rs | 3 |
7 files changed, 124 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs index b9fbff8db05..ee408c76006 100644 --- a/compiler/rustc_target/src/spec/mod.rs +++ b/compiler/rustc_target/src/spec/mod.rs @@ -2147,6 +2147,7 @@ supported_targets! { ("aarch64-unknown-none", aarch64_unknown_none), ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat), + ("aarch64_be-unknown-none-softfloat", aarch64_be_unknown_none_softfloat), ("aarch64-unknown-nuttx", aarch64_unknown_nuttx), ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx), diff --git a/compiler/rustc_target/src/spec/targets/aarch64_be_unknown_none_softfloat.rs b/compiler/rustc_target/src/spec/targets/aarch64_be_unknown_none_softfloat.rs new file mode 100644 index 00000000000..7f918e85080 --- /dev/null +++ b/compiler/rustc_target/src/spec/targets/aarch64_be_unknown_none_softfloat.rs @@ -0,0 +1,43 @@ +// Generic big-endian AArch64 target for bare-metal code - Floating point disabled +// +// Can be used in conjunction with the `target-feature` and +// `target-cpu` compiler flags to opt-in more hardware-specific +// features. +// +// For example, `-C target-cpu=cortex-a53`. +use rustc_abi::Endian; + +use crate::spec::{ + Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, SanitizerSet, StackProbeType, Target, + TargetMetadata, TargetOptions, +}; + +pub(crate) fn target() -> Target { + let opts = TargetOptions { + abi: "softfloat".into(), + linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes), + linker: Some("rust-lld".into()), + features: "+v8a,+strict-align,-neon,-fp-armv8".into(), + relocation_model: RelocModel::Static, + disable_redzone: true, + max_atomic_width: Some(128), + supported_sanitizers: SanitizerSet::KCFI | SanitizerSet::KERNELADDRESS, + stack_probes: StackProbeType::Inline, + panic_strategy: PanicStrategy::Abort, + endian: Endian::Big, + ..Default::default() + }; + Target { + llvm_target: "aarch64_be-unknown-none".into(), + metadata: TargetMetadata { + description: Some("Bare ARM64 (big-endian), softfloat".into()), + tier: Some(3), + host_tools: Some(false), + std: Some(false), + }, + pointer_width: 64, + data_layout: "E-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32".into(), + arch: "aarch64".into(), + options: opts, + } +} diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs index 3080e641b5b..bd02131b7fe 100644 --- a/src/bootstrap/src/core/sanity.rs +++ b/src/bootstrap/src/core/sanity.rs @@ -35,6 +35,7 @@ pub struct Finder { const STAGE0_MISSING_TARGETS: &[&str] = &[ "armv7a-vex-v5", // just a dummy comment so the list doesn't get onelined + "aarch64_be-unknown-none-softfloat", ]; /// Minimum version threshold for libstdc++ required when using prebuilt LLVM diff --git a/src/doc/rustc/src/SUMMARY.md b/src/doc/rustc/src/SUMMARY.md index 25f154f1180..b942e4bfa61 100644 --- a/src/doc/rustc/src/SUMMARY.md +++ b/src/doc/rustc/src/SUMMARY.md @@ -47,6 +47,7 @@ - [\*-apple-visionos](platform-support/apple-visionos.md) - [aarch64-nintendo-switch-freestanding](platform-support/aarch64-nintendo-switch-freestanding.md) - [aarch64-unknown-linux-musl](platform-support/aarch64-unknown-linux-musl.md) + - [aarch64_be-unknown-none-softfloat](platform-support/aarch64_be-unknown-none-softfloat.md) - [amdgcn-amd-amdhsa](platform-support/amdgcn-amd-amdhsa.md) - [armeb-unknown-linux-gnueabi](platform-support/armeb-unknown-linux-gnueabi.md) - [arm-none-eabi](platform-support/arm-none-eabi.md) diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md index 8ebaa8dd874..89b43cda9b9 100644 --- a/src/doc/rustc/src/platform-support.md +++ b/src/doc/rustc/src/platform-support.md @@ -273,6 +273,7 @@ target | std | host | notes `aarch64_be-unknown-linux-gnu` | ✓ | ✓ | ARM64 Linux (big-endian) `aarch64_be-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (big-endian, ILP32 ABI) [`aarch64_be-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | ARM64 NetBSD (big-endian) +[`aarch64_be-unknown-none-softfloat`](platform-support/aarch64_be-unknown-none-softfloat.md) | * | | Bare big-endian ARM64, softfloat [`amdgcn-amd-amdhsa`](platform-support/amdgcn-amd-amdhsa.md) | * | | `-Ctarget-cpu=gfx...` to specify [the AMD GPU] to compile for [`arm64_32-apple-watchos`](platform-support/apple-watchos.md) | ✓ | | Arm Apple WatchOS 64-bit with 32-bit pointers [`arm64e-apple-darwin`](platform-support/arm64e-apple-darwin.md) | ✓ | ✓ | ARM64e Apple Darwin diff --git a/src/doc/rustc/src/platform-support/aarch64_be-unknown-none-softfloat.md b/src/doc/rustc/src/platform-support/aarch64_be-unknown-none-softfloat.md new file mode 100644 index 00000000000..a28ddcdf7f2 --- /dev/null +++ b/src/doc/rustc/src/platform-support/aarch64_be-unknown-none-softfloat.md @@ -0,0 +1,74 @@ +# aarch64_be-unknown-none-softfloat + +**Tier: 3** + +Target for freestanding/bare-metal big-endian ARM64 binaries in ELF format: +firmware, kernels, etc. + +## Target maintainers + +[@Gelbpunkt](https://github.com/Gelbpunkt) + +## Requirements + +This target is cross-compiled. There is no support for `std`. There is no +default allocator, but it's possible to use `alloc` by supplying an allocator. + +The target does not assume existence of a FPU and does not make use of any +non-GPR register. This allows the generated code to run in environments, such +as kernels, which may need to avoid the use of such registers or which may have +special considerations about the use of such registers (e.g. saving and +restoring them to avoid breaking userspace code using the same registers). You +can change code generation to use additional CPU features via the +`-C target-feature=` codegen options to rustc, or via the `#[target_feature]` +mechanism within Rust code. + +By default, code generated with the soft-float target should run on any +big-endian ARM64 hardware, enabling additional target features may raise this +baseline. + +`extern "C"` uses the [architecture's standard calling convention][aapcs64]. + +[aapcs64]: https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst + +The targets generate binaries in the ELF format. Any alternate formats or +special considerations for binary layout will require linker options or linker +scripts. + +## Building the target + +You can build Rust with support for the target by adding it to the `target` +list in `bootstrap.toml`: + +```toml +[build] +target = ["aarch64_be-unknown-none-softfloat"] +``` + +## Building Rust programs + +Rust does not yet ship pre-compiled artifacts for this target. To compile for +this target, you will first need to build Rust with the target enabled (see +"Building the target" above). + +## Cross-compilation + +For cross builds, you will need an appropriate ARM64 C/C++ toolchain for +linking, or if you want to compile C code along with Rust (such as for Rust +crates with C dependencies). + +Rust *may* be able to use an `aarch64_be-unknown-linux-{gnu,musl}-` toolchain +with appropriate standalone flags to build for this target (depending on the +assumptions of that toolchain, see below), or you may wish to use a separate +`aarch64_be-unknown-none-softfloat` toolchain. + +On some ARM64 hosts that use ELF binaries, you *may* be able to use the host C +toolchain, if it does not introduce assumptions about the host environment that +don't match the expectations of a standalone environment. Otherwise, you may +need a separate toolchain for standalone/freestanding development, just as when +cross-compiling from a non-ARM64 platform. + +## Testing + +As the target supports a variety of different environments and does not support +`std`, it does not support running the Rust test suite. diff --git a/tests/assembly-llvm/targets/targets-elf.rs b/tests/assembly-llvm/targets/targets-elf.rs index ee63dffe9ea..a1d759ede2b 100644 --- a/tests/assembly-llvm/targets/targets-elf.rs +++ b/tests/assembly-llvm/targets/targets-elf.rs @@ -10,6 +10,9 @@ //@ revisions: aarch64_be_unknown_netbsd //@ [aarch64_be_unknown_netbsd] compile-flags: --target aarch64_be-unknown-netbsd //@ [aarch64_be_unknown_netbsd] needs-llvm-components: aarch64 +//@ revisions: aarch64_be_unknown_none_softfloat +//@ [aarch64_be_unknown_none_softfloat] compile-flags: --target aarch64_be-unknown-none-softfloat +//@ [aarch64_be_unknown_none_softfloat] needs-llvm-components: aarch64 //@ revisions: aarch64_kmc_solid_asp3 //@ [aarch64_kmc_solid_asp3] compile-flags: --target aarch64-kmc-solid_asp3 //@ [aarch64_kmc_solid_asp3] needs-llvm-components: aarch64 |