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Add X86 target support for NuttX
* Implement `i686-unknown-nuttx` and `x86_64-unknown-nuttx` target definitions * Integrate new targets into the platform support documentation * Update tests to include new target revisions This change introduces support for 32-bit and 64-bit x86 architectures on the NuttX operating system, enhancing the range of platforms Rust can target. The targets are defined as tier 3, indicating that they are supported but not automatically tested by the Rust project. The `i686-unknown-nuttx` target uses the `pentium4` CPU and 32-bit pointers, while the `x86_64-unknown-nuttx` target uses the `x86-64` CPU and 64-bit pointers. Both targets disable dynamic linking and use inline stack probes for improved performance and reliability in a bare-metal environment. Additionally, this commit updates the platform support documentation to list the new targets and includes them in the test suite to ensure that they build correctly. Signed-off-by: Huang Qi <[email protected]>
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‎compiler/rustc_target/src/spec/mod.rs

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@@ -2004,6 +2004,8 @@ supported_targets! {
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("x86_64-unknown-linux-none", x86_64_unknown_linux_none),
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("i686-unknown-nuttx", i686_unknown_nuttx),
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("x86_64-unknown-nuttx", x86_64_unknown_nuttx),
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("thumbv6m-nuttx-eabi", thumbv6m_nuttx_eabi),
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("thumbv7a-nuttx-eabi", thumbv7a_nuttx_eabi),
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("thumbv7a-nuttx-eabihf", thumbv7a_nuttx_eabihf),

‎compiler/rustc_target/src/spec/targets/i686_unknown_nuttx.rs

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use crate::spec::{Cc, LinkerFlavor, Lld, RelocModel, StackProbeType, Target, TargetOptions, cvs};
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pub(crate) fn target() -> Target {
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let mut base = TargetOptions {
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os: "nuttx".into(),
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dynamic_linking: false,
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families: cvs!["unix"],
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no_default_libraries: true,
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has_rpath: false,
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position_independent_executables: false,
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relocation_model: RelocModel::Static,
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relro_level: crate::spec::RelroLevel::Full,
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has_thread_local: true,
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use_ctors_section: true,
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..Default::default()
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};
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base.cpu = "pentium4".into();
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base.max_atomic_width = Some(64);
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base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m32"]);
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base.stack_probes = StackProbeType::Inline;
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Target {
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llvm_target: "i686-unknown-nuttx".into(),
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metadata: crate::spec::TargetMetadata {
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description: Some("NuttX/x86".into()),
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tier: Some(3),
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host_tools: Some(false),
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std: Some(true),
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},
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pointer_width: 32,
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data_layout: "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
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i128:128-f64:32:64-f80:32-n8:16:32-S128"
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.into(),
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arch: "x86".into(),
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options: base,
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}
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}

‎compiler/rustc_target/src/spec/targets/x86_64_unknown_nuttx.rs

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// Generic x86-64 target for NuttX RTOS
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//
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// Can be used in conjunction with the `target-feature` and
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// `target-cpu` compiler flags to opt-in more hardware-specific
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// features.
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use crate::spec::{RelocModel, StackProbeType, Target, TargetOptions, cvs};
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pub(crate) fn target() -> Target {
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let mut base = TargetOptions {
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os: "nuttx".into(),
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dynamic_linking: false,
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families: cvs!["unix"],
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no_default_libraries: true,
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has_rpath: false,
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position_independent_executables: false,
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relocation_model: RelocModel::Static,
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relro_level: crate::spec::RelroLevel::Full,
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has_thread_local: true,
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use_ctors_section: true,
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..Default::default()
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};
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base.cpu = "x86-64".into();
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base.max_atomic_width = Some(64);
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base.stack_probes = StackProbeType::Inline;
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Target {
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llvm_target: "x86_64-unknown-nuttx".into(),
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metadata: crate::spec::TargetMetadata {
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description: Some("NuttX/x86_64".into()),
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tier: Some(3),
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host_tools: Some(false),
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std: Some(true),
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},
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pointer_width: 64,
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data_layout:
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"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128".into(),
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arch: "x86_64".into(),
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options: base,
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}
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}

‎src/doc/rustc/src/platform-support.md

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@@ -314,6 +314,7 @@ target | std | host | notes
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`i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku (Pentium 4) [^x86_32-floats-return-ABI]
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[`i686-unknown-hurd-gnu`](platform-support/hurd.md) | ✓ | ✓ | 32-bit GNU/Hurd (PentiumPro) [^x86_32-floats-x87]
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[`i686-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD/i386 (Pentium 4) [^x86_32-floats-return-ABI]
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[`i686-unknown-nuttx`](platform-support/nuttx.md) | ✓ | | 32-bit x86 with NuttX
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[`i686-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 32-bit OpenBSD (Pentium 4) [^x86_32-floats-return-ABI]
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[`i686-unknown-redox`](platform-support/redox.md) | ✓ | | i686 Redox OS (PentiumPro) [^x86_32-floats-x87]
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`i686-uwp-windows-gnu` | ✓ | | [^x86_32-floats-return-ABI]
@@ -417,6 +418,7 @@ target | std | host | notes
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`x86_64-unknown-l4re-uclibc` | ? | |
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[`x86_64-unknown-linux-none`](platform-support/x86_64-unknown-linux-none.md) | * | | 64-bit Linux with no libc
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[`x86_64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 64-bit OpenBSD
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[`x86_64-unknown-nuttx`](platform-support/nuttx.md) | ✓ | | 64-bit x86 with NuttX
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[`x86_64-unknown-trusty`](platform-support/trusty.md) | ? | |
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`x86_64-uwp-windows-gnu` | ✓ | |
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[`x86_64-uwp-windows-msvc`](platform-support/uwp-windows-msvc.md) | ✓ | |

‎src/doc/rustc/src/platform-support/nuttx.md

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@@ -20,6 +20,8 @@ The target name follow this format: `ARCH[-VENDOR]-nuttx-ABI`, where `ARCH` is t
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The following target names are defined:
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- `i686-unknown-nuttx`
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- `x86_64-unknown-nuttx`
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- `aarch64-unknown-nuttx`
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- `armv7a-nuttx-eabi`
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- `armv7a-nuttx-eabihf`

‎tests/assembly/targets/targets-elf.rs

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@@ -249,6 +249,9 @@
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//@ revisions: i686_unknown_netbsd
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//@ [i686_unknown_netbsd] compile-flags: --target i686-unknown-netbsd
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//@ [i686_unknown_netbsd] needs-llvm-components: x86
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//@ revisions: i686_unknown_nuttx
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//@ [i686_unknown_nuttx] compile-flags: --target i686-unknown-nuttx
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//@ [i686_unknown_nuttx] needs-llvm-components: x86
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//@ revisions: i686_unknown_openbsd
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//@ [i686_unknown_openbsd] compile-flags: --target i686-unknown-openbsd
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//@ [i686_unknown_openbsd] needs-llvm-components: x86
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//@ revisions: x86_64_unknown_none
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//@ [x86_64_unknown_none] compile-flags: --target x86_64-unknown-none
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//@ [x86_64_unknown_none] needs-llvm-components: x86
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//@ revisions: x86_64_unknown_nuttx
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//@ [x86_64_unknown_nuttx] compile-flags: --target x86_64-unknown-nuttx
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//@ [x86_64_unknown_nuttx] needs-llvm-components: x86
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//@ revisions: x86_64_unknown_openbsd
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//@ [x86_64_unknown_openbsd] compile-flags: --target x86_64-unknown-openbsd
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//@ [x86_64_unknown_openbsd] needs-llvm-components: x86

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