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