Auto merge of rust-lang#108792 - Amanieu:ohos, r=petrochenkov

Add OpenHarmony targets

- `aarch64-unknown-linux-ohos`
- `armv7-unknown-linux-ohos`

Compiler team MCP: rust-lang/compiler-team#568

Author: bors

Cargo.lock

@@ -868,9 +868,9 @@ dependencies = [
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.87"
+version = "0.1.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f867ce54c09855ccd135ad4a50c777182a0c7af5ff20a8f537617bd648b10d50"
+checksum = "9fc9c2080d347a2c316518840ac9194644a9993dfa1e9778ef38979a339f5d8b"
 dependencies = [
  "cc",
  "rustc-std-workspace-core",
@@ -2879,9 +2879,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.139"
+version = "0.2.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
 dependencies = [
  "rustc-std-workspace-core",
 ]

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -214,6 +214,8 @@ pub fn target_machine_factory(
 
     let path_mapping = sess.source_map().path_mapping().clone();
 
+    let force_emulated_tls = sess.target.force_emulated_tls;
+
     Arc::new(move |config: TargetMachineFactoryConfig| {
         let split_dwarf_file =
             path_mapping.map_prefix(config.split_dwarf_file.unwrap_or_default()).0;
@@ -239,6 +241,7 @@ pub fn target_machine_factory(
                 relax_elf_relocations,
                 use_init_array,
                 split_dwarf_file.as_ptr(),
+                force_emulated_tls,
             )
         };
 

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -2257,6 +2257,7 @@ extern "C" {
         RelaxELFRelocations: bool,
         UseInitArray: bool,
         SplitDwarfFile: *const c_char,
+        ForceEmulatedTls: bool,
     ) -> Option<&'static mut TargetMachine>;
     pub fn LLVMRustDisposeTargetMachine(T: &'static mut TargetMachine);
     pub fn LLVMRustAddLibraryInfo<'a>(

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -368,7 +368,8 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
     bool EmitStackSizeSection,
     bool RelaxELFRelocations,
     bool UseInitArray,
-    const char *SplitDwarfFile) {
+    const char *SplitDwarfFile,
+    bool ForceEmulatedTls) {
 
   auto OptLevel = fromRust(RustOptLevel);
   auto RM = fromRust(RustReloc);
@@ -400,6 +401,10 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
   }
   Options.RelaxELFRelocations = RelaxELFRelocations;
   Options.UseInitArray = UseInitArray;
+  if (ForceEmulatedTls) {
+    Options.ExplicitEmulatedTLS = true;
+    Options.EmulatedTLS = true;
+  }
 
   if (TrapUnreachable) {
     // Tell LLVM to codegen `unreachable` into an explicit trap instruction.

compiler/rustc_target/src/spec/aarch64_unknown_linux_ohos.rs

@@ -0,0 +1,31 @@
+use crate::spec::{Target, TargetOptions};
+
+use super::SanitizerSet;
+
+pub fn target() -> Target {
+    let mut base = super::linux_musl_base::opts();
+    base.env = "ohos".into();
+    base.crt_static_default = false;
+    base.max_atomic_width = Some(128);
+
+    Target {
+        // LLVM 15 doesn't support OpenHarmony yet, use a linux target instead.
+        llvm_target: "aarch64-unknown-linux-musl".into(),
+        pointer_width: 64,
+        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".into(),
+        arch: "aarch64".into(),
+        options: TargetOptions {
+            features: "+reserve-x18".into(),
+            mcount: "\u{1}_mcount".into(),
+            force_emulated_tls: true,
+            supported_sanitizers: SanitizerSet::ADDRESS
+                | SanitizerSet::CFI
+                | SanitizerSet::LEAK
+                | SanitizerSet::MEMORY
+                | SanitizerSet::MEMTAG
+                | SanitizerSet::THREAD
+                | SanitizerSet::HWADDRESS,
+            ..base
+        },
+    }
+}

compiler/rustc_target/src/spec/armv7_unknown_linux_ohos.rs

@@ -0,0 +1,27 @@
+use crate::spec::{Target, TargetOptions};
+
+// This target is for OpenHarmony on ARMv7 Linux with thumb-mode, but no NEON or
+// hardfloat.
+
+pub fn target() -> Target {
+    // Most of these settings are copied from the armv7_unknown_linux_musleabi
+    // target.
+    Target {
+        // LLVM 15 doesn't support OpenHarmony yet, use a linux target instead.
+        llvm_target: "armv7-unknown-linux-gnueabi".into(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
+        arch: "arm".into(),
+
+        options: TargetOptions {
+            abi: "eabi".into(),
+            features: "+v7,+thumb2,+soft-float,-neon".into(),
+            max_atomic_width: Some(64),
+            env: "ohos".into(),
+            crt_static_default: false,
+            mcount: "\u{1}mcount".into(),
+            force_emulated_tls: true,
+            ..super::linux_musl_base::opts()
+        },
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -1261,6 +1261,9 @@ supported_targets! {
 
     ("aarch64-unknown-nto-qnx710", aarch64_unknown_nto_qnx_710),
     ("x86_64-pc-nto-qnx710", x86_64_pc_nto_qnx710),
+
+    ("aarch64-unknown-linux-ohos", aarch64_unknown_linux_ohos),
+    ("armv7-unknown-linux-ohos", armv7_unknown_linux_ohos),
 }
 
 /// Cow-Vec-Str: Cow<'static, [Cow<'static, str>]>
@@ -1734,6 +1737,9 @@ pub struct TargetOptions {
 
     /// Whether the target supports XRay instrumentation.
     pub supports_xray: bool,
+
+    /// Forces the use of emulated TLS (__emutls_get_address)
+    pub force_emulated_tls: bool,
 }
 
 /// Add arguments for the given flavor and also for its "twin" flavors
@@ -1954,6 +1960,7 @@ impl Default for TargetOptions {
             entry_name: "main".into(),
             entry_abi: Conv::C,
             supports_xray: false,
+            force_emulated_tls: false,
         }
     }
 }
@@ -2605,6 +2612,7 @@ impl Target {
         key!(entry_name);
         key!(entry_abi, Conv)?;
         key!(supports_xray, bool);
+        key!(force_emulated_tls, bool);
 
         if base.is_builtin {
             // This can cause unfortunate ICEs later down the line.
@@ -2859,6 +2867,7 @@ impl ToJson for Target {
         target_option_val!(entry_name);
         target_option_val!(entry_abi);
         target_option_val!(supports_xray);
+        target_option_val!(force_emulated_tls);
 
         if let Some(abi) = self.default_adjusted_cabi {
             d.insert("default-adjusted-cabi".into(), Abi::name(abi).to_json());

library/std/Cargo.toml

@@ -15,7 +15,7 @@ cfg-if = { version = "1.0", features = ['rustc-dep-of-std'] }
 panic_unwind = { path = "../panic_unwind", optional = true }
 panic_abort = { path = "../panic_abort" }
 core = { path = "../core" }
-libc = { version = "0.2.139", default-features = false, features = ['rustc-dep-of-std'] }
+libc = { version = "0.2.140", default-features = false, features = ['rustc-dep-of-std'] }
 compiler_builtins = { version = "0.1.87" }
 profiler_builtins = { path = "../profiler_builtins", optional = true }
 unwind = { path = "../unwind" }

library/std/src/sys/unix/os.rs

@@ -115,7 +115,10 @@ pub fn set_errno(e: i32) {
 /// Gets a detailed string description for the given error number.
 pub fn error_string(errno: i32) -> String {
     extern "C" {
-        #[cfg_attr(any(target_os = "linux", target_env = "newlib"), link_name = "__xpg_strerror_r")]
+        #[cfg_attr(
+            all(any(target_os = "linux", target_env = "newlib"), not(target_env = "ohos")),
+            link_name = "__xpg_strerror_r"
+        )]
         fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t) -> c_int;
     }
 

library/unwind/src/lib.rs

@@ -54,6 +54,22 @@ cfg_if::cfg_if! {
     }
 }
 
+// This is the same as musl except that we default to using the system libunwind
+// instead of libgcc.
+#[cfg(target_env = "ohos")]
+cfg_if::cfg_if! {
+    if #[cfg(all(feature = "llvm-libunwind", feature = "system-llvm-libunwind"))] {
+        compile_error!("`llvm-libunwind` and `system-llvm-libunwind` cannot be enabled at the same time");
+    } else if #[cfg(feature = "llvm-libunwind")] {
+        #[link(name = "unwind", kind = "static", modifiers = "-bundle")]
+        extern "C" {}
+    } else {
+        #[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
+        #[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
+        extern "C" {}
+    }
+}
+
 #[cfg(target_os = "android")]
 cfg_if::cfg_if! {
     if #[cfg(feature = "llvm-libunwind")] {