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Target: Add mips mti baremetal support
Do the same thing as gcc, which use the vendor `mti` to mark the toolchain as MIPS32r2 default. We support both big endian and little endian flavor: mips-mti-none-elf mipsel-mti-none-elf
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‎compiler/rustc_target/src/spec/mod.rs‎

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@@ -1926,6 +1926,8 @@ supported_targets! {
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("mipsel-sony-psp", mipsel_sony_psp),
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("mipsel-sony-psx", mipsel_sony_psx),
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("mipsel-unknown-none", mipsel_unknown_none),
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("mips-mti-none-elf", mips_mti_none_elf),
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("mipsel-mti-none-elf", mipsel_mti_none_elf),
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("thumbv4t-none-eabi", thumbv4t_none_eabi),
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("armv4t-none-eabi", armv4t_none_eabi),
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("thumbv5te-none-eabi", thumbv5te_none_eabi),

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

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use crate::abi::Endian;
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use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
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pub(crate) fn target() -> Target {
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Target {
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data_layout: "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".into(),
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llvm_target: "mips".into(),
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metadata: crate::spec::TargetMetadata {
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description: Some("MIPS32r2 BE Baremetal Softfloat".into()),
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tier: Some(3),
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host_tools: Some(false),
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std: None, // ?
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},
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pointer_width: 32,
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arch: "mips".into(),
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options: TargetOptions {
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vendor: "mti".into(),
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linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
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linker: Some("rust-lld".into()),
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endian: Endian::Big,
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cpu: "mips32r2".into(),
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max_atomic_width: Some(32),
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features: "+mips32r2,+soft-float,+noabicalls".into(),
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executables: true,
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panic_strategy: PanicStrategy::Abort,
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relocation_model: RelocModel::Static,
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emit_debug_gdb_scripts: false,
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eh_frame_header: false,
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singlethread: true,
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..Default::default()
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},
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}
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}

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

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use crate::abi::Endian;
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use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
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pub(crate) fn target() -> Target {
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Target {
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data_layout: "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".into(),
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llvm_target: "mipsel".into(),
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metadata: crate::spec::TargetMetadata {
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description: Some("MIPS32r2 LE Baremetal Softfloat".into()),
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tier: Some(3),
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host_tools: Some(false),
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std: None, // ?
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},
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pointer_width: 32,
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arch: "mips".into(),
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options: TargetOptions {
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vendor: "mti".into(),
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linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
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linker: Some("rust-lld".into()),
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endian: Endian::Little,
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cpu: "mips32r2".into(),
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max_atomic_width: Some(32),
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features: "+mips32r2,+soft-float,+noabicalls".into(),
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executables: true,
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panic_strategy: PanicStrategy::Abort,
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relocation_model: RelocModel::Static,
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emit_debug_gdb_scripts: false,
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eh_frame_header: false,
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singlethread: true,
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..Default::default()
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},
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}
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}

‎src/doc/rustc/src/SUMMARY.md‎

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- [m68k-unknown-linux-gnu](platform-support/m68k-unknown-linux-gnu.md)
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- [mips64-openwrt-linux-musl](platform-support/mips64-openwrt-linux-musl.md)
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- [mipsel-sony-psx](platform-support/mipsel-sony-psx.md)
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- [mips\*-mti-none-elf](platform-support/mips-mti-none-elf.md)
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- [mipsisa\*r6\*-unknown-linux-gnu\*](platform-support/mips-release-6.md)
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- [nvptx64-nvidia-cuda](platform-support/nvptx64-nvidia-cuda.md)
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- [powerpc-unknown-openbsd](platform-support/powerpc-unknown-openbsd.md)

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

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`mipsel-unknown-linux-uclibc` | ✓ | | MIPS (LE) Linux with uClibc
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[`mipsel-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | 32-bit MIPS (LE), requires mips32 cpu support
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`mipsel-unknown-none` | * | | Bare MIPS (LE) softfloat
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[`mips-mti-none-elf`](platform-support/mips-mti-none-elf.md) | * | | Bare MIPS32r2 (BE) softfloat
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[`mipsel-mti-none-elf`](platform-support/mips-mti-none-elf.md) | * | | Bare MIPS32r2 (LE) softfloat
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[`mipsisa32r6-unknown-linux-gnu`](platform-support/mips-release-6.md) | ? | | 32-bit MIPS Release 6 Big Endian
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[`mipsisa32r6el-unknown-linux-gnu`](platform-support/mips-release-6.md) | ? | | 32-bit MIPS Release 6 Little Endian
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[`mipsisa64r6-unknown-linux-gnuabi64`](platform-support/mips-release-6.md) | ? | | 64-bit MIPS Release 6 Big Endian

‎src/doc/rustc/src/platform-support/mips-mti-none-elf.md‎

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# `mips*-mti-none-elf`
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**Tier: 3**
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MIPS32r2 baremetal softfloat, Big Endian or Little Enedian.
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- mips-mti-none-elf
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- mipsel-mti-none-elf
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## Target maintainers
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- YunQiang Su, `syq@debian.org`, https://github.com/wzssyqa
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## Background
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These 2 targets, aka mips-mti-none-elf and mipsel-mti-none-elf, are for
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baremetal development of MIPS32r2. The lld is used instead of Gnu-ld.
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## Requirements
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The target only supports cross compilation and no host tools. The target
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supports `alloc` with a default allocator while only support `no-std` development.
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The vendor name `mti` follows the naming of gcc to indicate MIPS32r2.
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## Cross-compilation toolchains and C code
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Compatible C code can be built for this target on any compiler that has a MIPS32r2
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target. On clang and ld.lld linker, it can be generated using the
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`-march=mips`/`-march=mipsel`, `-mabi=32` with llvm features flag
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`features=+mips32r2,+soft-float,+noabicalls`.

‎src/tools/build-manifest/src/main.rs‎

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"mipsisa64r6el-unknown-linux-gnuabi64",
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"mipsel-unknown-linux-gnu",
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"mipsel-unknown-linux-musl",
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"mips-mti-none-elf",
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"mipsel-mti-none-elf",
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"nvptx64-nvidia-cuda",
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"powerpc-unknown-linux-gnu",
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"powerpc64-unknown-linux-gnu",

‎tests/assembly/targets/targets-elf.rs‎

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//@ revisions: mips_unknown_linux_uclibc
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//@ [mips_unknown_linux_uclibc] compile-flags: --target mips-unknown-linux-uclibc
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//@ [mips_unknown_linux_uclibc] needs-llvm-components: mips
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//@ revisions: mips_mti_none_elf
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//@ [mips_mti_none_elf] compile-flags: --target mips-mti-none-elf
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//@ [mips_mti_none_elf] needs-llvm-components: mips
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//@ revisions: mipsel_mti_none_elf
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//@ [mipsel_mti_none_elf] compile-flags: --target mipsel-mti-none-elf
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//@ [mipsel_mti_none_elf] needs-llvm-components: mips
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//@ revisions: mipsel_sony_psp
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//@ [mipsel_sony_psp] compile-flags: --target mipsel-sony-psp
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//@ [mipsel_sony_psp] needs-llvm-components: mips

‎tests/ui/check-cfg/well-known-values.stderr‎

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LL | target_vendor = "_UNEXPECTED_VALUE",
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: expected values for `target_vendor` are: `apple`, `espressif`, `fortanix`, `ibm`, `kmc`, `nintendo`, `nvidia`, `pc`, `risc0`, `sony`, `sun`, `unikraft`, `unknown`, `uwp`, `win7`, and `wrs`
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= note: expected values for `target_vendor` are: `apple`, `espressif`, `fortanix`, `ibm`, `kmc`, `mti`, `nintendo`, `nvidia`, `pc`, `risc0`, `sony`, `sun`, `unikraft`, `unknown`, `uwp`, `win7`, and `wrs`
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= note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
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warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`

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