| use std::fs::File; |
| use std::io::Write; |
| use std::path::{Path, PathBuf}; |
| use std::{env, ffi::OsStr}; |
| |
| fn main() { |
| let mut target = env::var("TARGET").unwrap(); |
| |
| // When using a custom target JSON, `$TARGET` contains the path to that JSON file. By |
| // convention, these files are named after the actual target triple, eg. |
| // `thumbv7m-customos-elf.json`, so we extract the file stem here to allow custom target specs. |
| let path = Path::new(&target); |
| if path.extension() == Some(OsStr::new("json")) { |
| target = path |
| .file_stem() |
| .map_or(target.clone(), |stem| stem.to_str().unwrap().to_string()); |
| } |
| |
| // Put the linker script somewhere the linker can find it |
| let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap()); |
| let link_x = include_bytes!("link.x.in"); |
| let mut f = if env::var_os("CARGO_FEATURE_DEVICE").is_some() { |
| let mut f = File::create(out.join("link.x")).unwrap(); |
| |
| f.write_all(link_x).unwrap(); |
| |
| // *IMPORTANT*: The weak aliases (i.e. `PROVIDED`) must come *after* `EXTERN(__INTERRUPTS)`. |
| // Otherwise the linker will ignore user defined interrupts and always populate the table |
| // with the weak aliases. |
| writeln!( |
| f, |
| r#" |
| /* Provides weak aliases (cf. PROVIDED) for device specific interrupt handlers */ |
| /* This will usually be provided by a device crate generated using svd2rust (see `device.x`) */ |
| INCLUDE device.x"# |
| ) |
| .unwrap(); |
| f |
| } else { |
| let mut f = File::create(out.join("link.x")).unwrap(); |
| f.write_all(link_x).unwrap(); |
| f |
| }; |
| |
| let max_int_handlers = if target.starts_with("thumbv6m-") { |
| println!("cargo:rustc-cfg=cortex_m"); |
| println!("cargo:rustc-cfg=armv6m"); |
| 32 |
| } else if target.starts_with("thumbv7m-") || target.starts_with("thumbv7em-") { |
| println!("cargo:rustc-cfg=cortex_m"); |
| println!("cargo:rustc-cfg=armv7m"); |
| 240 |
| } else if target.starts_with("thumbv8m") { |
| println!("cargo:rustc-cfg=cortex_m"); |
| println!("cargo:rustc-cfg=armv8m"); |
| 240 |
| } else { |
| // Non ARM target. We assume you're just testing the syntax. |
| // This value seems as soon as any |
| 240 |
| }; |
| |
| if target.ends_with("-eabihf") { |
| println!("cargo:rustc-cfg=has_fpu"); |
| } |
| |
| // checking the size of the interrupts portion of the vector table is sub-architecture dependent |
| writeln!( |
| f, |
| r#" |
| ASSERT(SIZEOF(.vector_table) <= 0x{:x}, " |
| There can't be more than {1} interrupt handlers. This may be a bug in |
| your device crate, or you may have registered more than {1} interrupt |
| handlers."); |
| "#, |
| max_int_handlers * 4 + 0x40, |
| max_int_handlers |
| ) |
| .unwrap(); |
| |
| println!("cargo:rustc-link-search={}", out.display()); |
| |
| println!("cargo:rerun-if-changed=build.rs"); |
| println!("cargo:rerun-if-changed=link.x.in"); |
| } |