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//! 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()
},
}
}
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