rustc_target/spec/targets/
msp430_none_elf.rs

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1use crate::spec::{
2    Cc, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetMetadata, TargetOptions, cvs,
3};
4
5pub(crate) fn target() -> Target {
6    Target {
7        llvm_target: "msp430-none-elf".into(),
8        metadata: TargetMetadata {
9            description: Some("16-bit MSP430 microcontrollers".into()),
10            tier: Some(3),
11            host_tools: Some(false),
12            std: Some(false),
13        },
14        pointer_width: 16,
15        data_layout: "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16".into(),
16        arch: "msp430".into(),
17
18        options: TargetOptions {
19            c_int_width: "16".into(),
20
21            // The LLVM backend currently can't generate object files. To
22            // workaround this LLVM generates assembly files which then we feed
23            // to gcc to get object files. For this reason we have a hard
24            // dependency on this specific gcc.
25            asm_args: cvs!["-mcpu=msp430"],
26            linker: Some("msp430-elf-gcc".into()),
27            linker_flavor: LinkerFlavor::Unix(Cc::Yes),
28
29            // There are no atomic CAS instructions available in the MSP430
30            // instruction set, and the LLVM backend doesn't currently support
31            // compiler fences so the Atomic* API is missing on this target.
32            // When the LLVM backend gains support for compile fences uncomment
33            // the `singlethread: true` line and set `max_atomic_width` to
34            // `Some(16)`.
35            max_atomic_width: Some(0),
36            atomic_cas: false,
37            // singlethread: true,
38
39            // Because these devices have very little resources having an
40            // unwinder is too onerous so we default to "abort" because the
41            // "unwind" strategy is very rare.
42            panic_strategy: PanicStrategy::Abort,
43
44            // Similarly, one almost always never wants to use relocatable
45            // code because of the extra costs it involves.
46            relocation_model: RelocModel::Static,
47
48            // Right now we invoke an external assembler and this isn't
49            // compatible with multiple codegen units, and plus we probably
50            // don't want to invoke that many gcc instances.
51            default_codegen_units: Some(1),
52
53            // Since MSP430 doesn't meaningfully support faulting on illegal
54            // instructions, LLVM generates a call to abort() function instead
55            // of a trap instruction. Such calls are 4 bytes long, and that is
56            // too much overhead for such small target.
57            trap_unreachable: false,
58
59            // See the thumb_base.rs file for an explanation of this value
60            emit_debug_gdb_scripts: false,
61
62            eh_frame_header: false,
63
64            ..Default::default()
65        },
66    }
67}
rustc_target/spec/targets/msp430_none_elf.rs

rustc_target/spec/targets/
msp430_none_elf.rs
