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//! Targets the ARMv4T, with code as `a32` code by default.
//!
//! Primarily of use for the GBA, but usable with other devices too.
//!
//! Please ping @Lokathor if changes are needed.
//!
//! **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, Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
pub(crate) fn target() -> Target {
Target {
llvm_target: "armv4t-none-eabi".into(),
metadata: crate::spec::TargetMetadata {
description: Some("Bare Armv4T".into()),
tier: Some(3),
host_tools: Some(false),
std: Some(false),
},
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::Gnu(Cc::No, Lld::Yes),
linker: Some("rust-lld".into()),
asm_args: cvs!["-mthumb-interwork", "-march=armv4t", "-mlittle-endian",],
// 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(),
main_needs_argc_argv: false,
atomic_cas: false,
has_thumb_interworking: true,
relocation_model: RelocModel::Static,
panic_strategy: PanicStrategy::Abort,
// From thumb_base, rust-lang/rust#44993.
emit_debug_gdb_scripts: false,
// From thumb_base, GCC gives enums a minimum of 8 bits on no-os targets.
c_enum_min_bits: Some(8),
..Default::default()
},
}
}