WIP: Fix TLS issues on riscv64

Cargo.lock

@@ -1280,6 +1280,7 @@ dependencies = [
 [[package]]
 name = "libm"
 version = "0.2.8"
+source = "git+https://git.alnyan.me/yggdrasil/libm.git#78b62c33fc6a56b6c063c19bbffc5224616b7028"
 dependencies = [
  "rustc-std-workspace-core",
 ]

lib/runtime/Cargo.toml

@@ -10,7 +10,7 @@ yggdrasil-abi = { path = "../abi", features = ["alloc"] }
 
 core = { version = "1.0.0", optional = true, package = "rustc-std-workspace-core" }
 alloc = { version = "1.0.0", optional = true, package = "rustc-std-workspace-alloc" }
-libm = { path = "/home/alnyan/build/sandbox/yggdrasil-packages/libm", optional = true }
+libm = { git = "https://git.alnyan.me/yggdrasil/libm.git", optional = true }
 
 abi-lib = { path = "../abi-lib" }
 abi-serde = { path = "../abi-serde" }

lib/runtime/build.rs

@@ -29,13 +29,23 @@ fn build_libm() {
     let mut build = cc::Build::new();
 
     let rust_target = env::var("TARGET").unwrap();
-    let cc_target = rust_target.replace("-lp64", "");
+    let cc_target = match rust_target.as_ref() {
+        "x86_64-unknown-none" | "x86_64-unknown-yggdrasil" => "x86_64-unknown-none",
+        "aarch64-unknown-none" | "aarch64-unknown-yggdrasil" => "aarch64-unknown-none",
+        "riscv64-unknown-yggdrasil" | "riscv64-unknown-none" => "riscv64-unknown-none",
+        _ => todo!("{rust_target:?}"),
+    };
 
     build
         .compiler("clang")
         .flag("-ffreestanding")
-        .flag("-nostdlib")
-        .target(&cc_target);
+        .flag("-nostdlib");
+
+    if cc_target == "riscv64-unknown-none" {
+        build.flag("--target=riscv64-unknown-none");
+    } else {
+        build.target(cc_target);
+    }
 
     add_file(&mut build, "libm/e_fmodf.c");
     add_file(&mut build, "libm/e_hypotf.c");

lib/runtime/src/process/thread_local/mod.rs

@@ -336,7 +336,7 @@ pub fn get_dtv() -> &'static mut Dtv {
 unsafe extern "C" fn __tls_get_addr(index: *mut usize) -> *mut c_void {
     unsafe {
         let module_id = index.read();
-        let offset = index.add(1).read();
-        get_dtv().get(module_id).add(offset)
+        let offset = index.add(1).read() as isize;
+        get_dtv().get(module_id).offset(offset)
     }
 }