| //! Targets the ARMv4T, with code as `t32` code by default. |
| //! |
| //! Primarily of use for the GBA, but usable with other devices too. |
| //! |
| //! Please ping @Lokathor if changes are needed. |
| //! |
| //! This target profile assumes that you have the ARM binutils in your path |
| //! (specifically the linker, `arm-none-eabi-ld`). They can be obtained for free |
| //! for all major OSes from the ARM developer's website, and they may also be |
| //! available in your system's package manager. Unfortunately, the standard |
| //! linker that Rust uses (`lld`) only supports as far back as `ARMv5TE`, so we |
| //! must use the GNU `ld` linker. |
| //! |
| //! **Important:** This target profile **does not** specify a linker script. You |
| //! just get the default link script when you build a binary for this target. |
| //! The default link script is very likely wrong, so you should use |
| //! `-Clink-arg=-Tmy_script.ld` to override that with a correct linker script. |
| |
| use crate::spec::{ |
| cvs, FramePointer, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetOptions, |
| }; |
| |
| pub fn target() -> Target { |
| Target { |
| llvm_target: "thumbv4t-none-eabi".into(), |
| pointer_width: 32, |
| arch: "arm".into(), |
| /* Data layout args are '-' separated: |
| * little endian |
| * stack is 64-bit aligned (EABI) |
| * pointers are 32-bit |
| * i64 must be 64-bit aligned (EABI) |
| * mangle names with ELF style |
| * native integers are 32-bit |
| * All other elements are default |
| */ |
| data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(), |
| options: TargetOptions { |
| abi: "eabi".into(), |
| linker_flavor: LinkerFlavor::Ld, |
| linker: Some("arm-none-eabi-ld".into()), |
| |
| // extra args passed to the external assembler (assuming `arm-none-eabi-as`): |
| // * activate t32/a32 interworking |
| // * use arch ARMv4T |
| // * use little-endian |
| asm_args: cvs!["-mthumb-interwork", "-march=armv4t", "-mlittle-endian",], |
| |
| // minimum extra features, these cannot be disabled via -C |
| // Also force-enable 32-bit atomics, which allows the use of atomic load/store only. |
| // The resulting atomics are ABI incompatible with atomics backed by libatomic. |
| features: "+soft-float,+strict-align,+atomics-32".into(), |
| |
| panic_strategy: PanicStrategy::Abort, |
| relocation_model: RelocModel::Static, |
| // suggested from thumb_base, rust-lang/rust#44993. |
| emit_debug_gdb_scripts: false, |
| // suggested from thumb_base, with no-os gcc/clang use 8-bit enums |
| c_enum_min_bits: 8, |
| frame_pointer: FramePointer::MayOmit, |
| |
| main_needs_argc_argv: false, |
| |
| // don't have atomic compare-and-swap |
| atomic_cas: false, |
| has_thumb_interworking: true, |
| |
| ..super::thumb_base::opts() |
| }, |
| } |
| } |
