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572b6a9c60
In accordance with the design from https://github.com/rust-lang/rust/pull/96827#issuecomment-1208441595
60 lines
2.5 KiB
Rust
60 lines
2.5 KiB
Rust
use crate::spec::{cvs, Cc, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetOptions};
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pub fn target() -> Target {
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Target {
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llvm_target: "msp430-none-elf".into(),
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pointer_width: 16,
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data_layout: "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16".into(),
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arch: "msp430".into(),
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options: TargetOptions {
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c_int_width: "16".into(),
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// The LLVM backend currently can't generate object files. To
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// workaround this LLVM generates assembly files which then we feed
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// to gcc to get object files. For this reason we have a hard
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// dependency on this specific gcc.
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asm_args: cvs!["-mcpu=msp430"],
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linker: Some("msp430-elf-gcc".into()),
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linker_flavor: LinkerFlavor::Unix(Cc::Yes),
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// There are no atomic CAS instructions available in the MSP430
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// instruction set, and the LLVM backend doesn't currently support
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// compiler fences so the Atomic* API is missing on this target.
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// When the LLVM backend gains support for compile fences uncomment
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// the `singlethread: true` line and set `max_atomic_width` to
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// `Some(16)`.
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max_atomic_width: Some(0),
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atomic_cas: false,
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// singlethread: true,
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// Because these devices have very little resources having an
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// unwinder is too onerous so we default to "abort" because the
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// "unwind" strategy is very rare.
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panic_strategy: PanicStrategy::Abort,
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// Similarly, one almost always never wants to use relocatable
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// code because of the extra costs it involves.
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relocation_model: RelocModel::Static,
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// Right now we invoke an external assembler and this isn't
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// compatible with multiple codegen units, and plus we probably
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// don't want to invoke that many gcc instances.
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default_codegen_units: Some(1),
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// Since MSP430 doesn't meaningfully support faulting on illegal
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// instructions, LLVM generates a call to abort() function instead
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// of a trap instruction. Such calls are 4 bytes long, and that is
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// too much overhead for such small target.
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trap_unreachable: false,
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// See the thumb_base.rs file for an explanation of this value
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emit_debug_gdb_scripts: false,
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eh_frame_header: false,
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..Default::default()
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},
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}
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}
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