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1 | //! Targets the ARMv4T, with code as `t32` code by default. |
2 | //! | |
3 | //! Primarily of use for the GBA, but usable with other devices too. | |
4 | //! | |
5 | //! Please ping @Lokathor if changes are needed. | |
6 | //! | |
064997fb FG |
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. | |
3dfed10e | 13 | //! |
064997fb FG |
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. | |
3dfed10e | 18 | |
2b03887a FG |
19 | use crate::spec::{cvs, Cc, FramePointer, LinkerFlavor, Lld}; |
20 | use crate::spec::{PanicStrategy, RelocModel, Target, TargetOptions}; | |
3dfed10e | 21 | |
29967ef6 XL |
22 | pub fn target() -> Target { |
23 | Target { | |
5e7ed085 | 24 | llvm_target: "thumbv4t-none-eabi".into(), |
29967ef6 | 25 | pointer_width: 32, |
5e7ed085 | 26 | arch: "arm".into(), |
3dfed10e XL |
27 | /* Data layout args are '-' separated: |
28 | * little endian | |
29 | * stack is 64-bit aligned (EABI) | |
30 | * pointers are 32-bit | |
31 | * i64 must be 64-bit aligned (EABI) | |
32 | * mangle names with ELF style | |
33 | * native integers are 32-bit | |
34 | * All other elements are default | |
35 | */ | |
5e7ed085 | 36 | data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(), |
3dfed10e | 37 | options: TargetOptions { |
5e7ed085 | 38 | abi: "eabi".into(), |
2b03887a | 39 | linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::No), |
5e7ed085 | 40 | linker: Some("arm-none-eabi-ld".into()), |
3dfed10e XL |
41 | |
42 | // extra args passed to the external assembler (assuming `arm-none-eabi-as`): | |
43 | // * activate t32/a32 interworking | |
44 | // * use arch ARMv4T | |
45 | // * use little-endian | |
5e7ed085 | 46 | asm_args: cvs!["-mthumb-interwork", "-march=armv4t", "-mlittle-endian",], |
3dfed10e XL |
47 | |
48 | // minimum extra features, these cannot be disabled via -C | |
f2b60f7d FG |
49 | // Also force-enable 32-bit atomics, which allows the use of atomic load/store only. |
50 | // The resulting atomics are ABI incompatible with atomics backed by libatomic. | |
51 | features: "+soft-float,+strict-align,+atomics-32".into(), | |
3dfed10e | 52 | |
064997fb FG |
53 | panic_strategy: PanicStrategy::Abort, |
54 | relocation_model: RelocModel::Static, | |
55 | // suggested from thumb_base, rust-lang/rust#44993. | |
56 | emit_debug_gdb_scripts: false, | |
57 | // suggested from thumb_base, with no-os gcc/clang use 8-bit enums | |
9ffffee4 | 58 | c_enum_min_bits: Some(8), |
064997fb FG |
59 | frame_pointer: FramePointer::MayOmit, |
60 | ||
3dfed10e XL |
61 | main_needs_argc_argv: false, |
62 | ||
3dfed10e XL |
63 | // don't have atomic compare-and-swap |
64 | atomic_cas: false, | |
29967ef6 | 65 | has_thumb_interworking: true, |
3dfed10e XL |
66 | |
67 | ..super::thumb_base::opts() | |
68 | }, | |
29967ef6 | 69 | } |
3dfed10e | 70 | } |