Rollup merge of rust-lang#142053 - heiher:loong32-none, r=wesleywiser

Add new Tier-3 targets: `loongarch32-unknown-none*`

MCP: rust-lang/compiler-team#865

NOTE: LoongArch32 ELF object support is available starting with object v0.37.0.

Author: workingjubilee

core/Cargo.toml

@@ -29,6 +29,8 @@ debug_typeid = []
 [lints.rust.unexpected_cfgs]
 level = "warn"
 check-cfg = [
+    # #[cfg(bootstrap)] loongarch32
+    'cfg(target_arch, values("loongarch32"))',
     'cfg(no_fp_fmt_parse)',
     # core use #[path] imports to portable-simd `core_simd` crate
     # and to stdarch `core_arch` crate which messes-up with Cargo list

core/src/sync/atomic.rs

@@ -178,7 +178,7 @@
 //!
 //! | `target_arch` | Size limit |
 //! |---------------|---------|
-//! | `x86`, `arm`, `mips`, `mips32r6`, `powerpc`, `riscv32`, `sparc`, `hexagon` | 4 bytes |
+//! | `x86`, `arm`, `loongarch32`, `mips`, `mips32r6`, `powerpc`, `riscv32`, `sparc`, `hexagon` | 4 bytes |
 //! | `x86_64`, `aarch64`, `loongarch64`, `mips64`, `mips64r6`, `powerpc64`, `riscv64`, `sparc64`, `s390x` | 8 bytes |
 //!
 //! Atomics loads that are larger than this limit as well as atomic loads with ordering other
@@ -350,8 +350,12 @@ pub type Atomic<T> = <T as AtomicPrimitive>::AtomicInner;
 // This list should only contain architectures which have word-sized atomic-or/
 // atomic-and instructions but don't natively support byte-sized atomics.
 #[cfg(target_has_atomic = "8")]
-const EMULATE_ATOMIC_BOOL: bool =
-    cfg!(any(target_arch = "riscv32", target_arch = "riscv64", target_arch = "loongarch64"));
+const EMULATE_ATOMIC_BOOL: bool = cfg!(any(
+    target_arch = "riscv32",
+    target_arch = "riscv64",
+    target_arch = "loongarch32",
+    target_arch = "loongarch64"
+));
 
 /// A boolean type which can be safely shared between threads.
 ///

std/Cargo.toml

@@ -157,6 +157,8 @@ test = true
 [lints.rust.unexpected_cfgs]
 level = "warn"
 check-cfg = [
+    # #[cfg(bootstrap)] loongarch32
+    'cfg(target_arch, values("loongarch32"))',
     # std use #[path] imports to portable-simd `std_float` crate
     # and to the `backtrace` crate which messes-up with Cargo list
     # of declared features, we therefor expect any feature cfg

std/src/env.rs

@@ -1046,6 +1046,7 @@ pub mod consts {
     /// * `"sparc"`
     /// * `"sparc64"`
     /// * `"hexagon"`
+    /// * `"loongarch32"`
     /// * `"loongarch64"`
     ///
     /// </details>

std/src/os/linux/raw.rs

@@ -231,6 +231,7 @@ mod arch {
 }
 
 #[cfg(any(
+    target_arch = "loongarch32",
     target_arch = "loongarch64",
     target_arch = "mips64",
     target_arch = "mips64r6",

std/src/sys/alloc/mod.rs

@@ -17,6 +17,7 @@ const MIN_ALIGN: usize = if cfg!(any(
     target_arch = "arm",
     target_arch = "m68k",
     target_arch = "csky",
+    target_arch = "loongarch32",
     target_arch = "mips",
     target_arch = "mips32r6",
     target_arch = "powerpc",

std/src/sys/personality/gcc.rs

@@ -86,7 +86,7 @@ const UNWIND_DATA_REG: (i32, i32) = (0, 1); // R0, R1
 #[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))]
 const UNWIND_DATA_REG: (i32, i32) = (10, 11); // x10, x11
 
-#[cfg(target_arch = "loongarch64")]
+#[cfg(any(target_arch = "loongarch32", target_arch = "loongarch64"))]
 const UNWIND_DATA_REG: (i32, i32) = (4, 5); // a0, a1
 
 // The following code is based on GCC's C and C++ personality routines.  For reference, see:

unwind/Cargo.toml

@@ -37,4 +37,4 @@ system-llvm-libunwind = []
 
 [lints.rust.unexpected_cfgs]
 level = "warn"
-check-cfg = ['cfg(emscripten_wasm_eh)']
+check-cfg = ['cfg(emscripten_wasm_eh)', 'cfg(target_arch, values("loongarch32"))']

unwind/src/libunwind.rs

@@ -81,7 +81,7 @@ pub const unwinder_private_data_size: usize = 2;
 #[cfg(all(target_arch = "hexagon", target_os = "linux"))]
 pub const unwinder_private_data_size: usize = 35;
 
-#[cfg(target_arch = "loongarch64")]
+#[cfg(any(target_arch = "loongarch32", target_arch = "loongarch64"))]
 pub const unwinder_private_data_size: usize = 2;
 
 #[repr(C)]