riscv-rt: include device in link.x

riscv-rt/CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Added
+
+- New `device` feature to include `device.x` in `link.x`. This feature is based
+  on the current implementation of `cortex-m-rt`.
+
 ### Changed
 
 - Linker file now refers to standard exceptions and interrupts only when the

riscv-rt/Cargo.toml

@@ -37,3 +37,4 @@ v-trap = ["riscv-rt-macros/v-trap"]
 u-boot = ["riscv-rt-macros/u-boot", "single-hart"]
 no-interrupts = []
 no-exceptions = []
+device = []

riscv-rt/build.rs

@@ -24,6 +24,11 @@ fn add_linker_script(arch_width: u32) -> io::Result<()> {
         let interrupts_content = fs::read_to_string("interrupts.x")?;
         include_content.push_str(&(interrupts_content + "\n"));
     }
+    // If device is enabled, include the device.x file (usually, provided by PACs)
+    if env::var_os("CARGO_FEATURE_DEVICE").is_some() {
+        include_content.push_str("/* Device-specific exception and interrupt handlers */\n");
+        include_content.push_str("INCLUDE device.x\n");
+    }
 
     content = content.replace("${INCLUDE_LINKER_FILES}", &include_content);