diff options
Diffstat (limited to 'compiler/rustc_target/src/spec/thumbv4t_none_eabi.rs')
-rw-r--r-- | compiler/rustc_target/src/spec/thumbv4t_none_eabi.rs | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/thumbv4t_none_eabi.rs b/compiler/rustc_target/src/spec/thumbv4t_none_eabi.rs new file mode 100644 index 000000000..7125d141a --- /dev/null +++ b/compiler/rustc_target/src/spec/thumbv4t_none_eabi.rs @@ -0,0 +1,69 @@ +//! 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 + features: "+soft-float,+strict-align".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() + }, + } +} |