1 //! Targets the ARMv4T, with code as `a32` code by default.
3 //! Primarily of use for the GBA, but usable with other devices too.
5 //! Please ping @Lokathor if changes are needed.
7 //! This target profile assumes that you have the ARM binutils in your path
8 //! (specifically the linker, `arm-none-eabi-ld`). They can be obtained for free
9 //! for all major OSes from the ARM developer's website, and they may also be
10 //! available in your system's package manager. Unfortunately, the standard
11 //! linker that Rust uses (`lld`) only supports as far back as `ARMv5TE`, so we
12 //! must use the GNU `ld` linker.
14 //! **Important:** This target profile **does not** specify a linker script. You
15 //! just get the default link script when you build a binary for this target.
16 //! The default link script is very likely wrong, so you should use
17 //! `-Clink-arg=-Tmy_script.ld` to override that with a correct linker script.
19 use crate::spec::{cvs, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetOptions};
21 pub fn target() -> Target {
23 llvm_target: "armv4t-none-eabi".into(),
26 /* Data layout args are '-' separated:
28 * stack is 64-bit aligned (EABI)
30 * i64 must be 64-bit aligned (EABI)
31 * mangle names with ELF style
32 * native integers are 32-bit
33 * All other elements are default
35 data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
36 options: TargetOptions {
38 linker_flavor: LinkerFlavor::Ld,
39 linker: Some("arm-none-eabi-ld".into()),
40 asm_args: cvs!["-mthumb-interwork", "-march=armv4t", "-mlittle-endian",],
41 // Force-enable 32-bit atomics, which allows the use of atomic load/store only.
42 // The resulting atomics are ABI incompatible with atomics backed by libatomic.
43 features: "+soft-float,+strict-align,+atomics-32".into(),
44 main_needs_argc_argv: false,
46 has_thumb_interworking: true,
47 relocation_model: RelocModel::Static,
48 panic_strategy: PanicStrategy::Abort,
49 // from thumb_base, rust-lang/rust#44993.
50 emit_debug_gdb_scripts: false,
51 // from thumb_base, apparently gcc/clang give enums a minimum of 8 bits on no-os targets