1 files changed, 147 insertions, 0 deletions
diff --git a/vendor/portable-atomic/src/gen/utils.rs b/vendor/portable-atomic/src/gen/utils.rs
new file mode 100644
index 0000000..61f6c99
--- /dev/null
+++ b/vendor/portable-atomic/src/gen/utils.rs
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+// This file is @generated by target_spec.sh.
+// It is not intended for manual editing.
+
+#![allow(unused_macros)]
+
+// On AArch64, the base register of load/store/atomic instructions must be 64-bit.
+// Passing a 32-bit value to `in(reg)` on AArch64 results in the upper bits
+// having an undefined value, but to work correctly with ILP32 ABI, the upper
+// bits must be zero, which is handled here by casting to u64. Another way to
+// handle this is to pass it as a pointer and clear the upper bits inside asm,
+// but it is easier to overlook than cast, which can catch overlooks by
+// asm_sub_register lint.
+// See also https://github.com/ARM-software/abi-aa/blob/2023Q1/aapcs64/aapcs64.rst#57pointers
+//
+// Except for x86_64, which can use 32-bit registers in the destination operand
+// (on x86_64, we use the ptr_modifier macro to handle this), we need to do the
+// same for ILP32 ABI on other 64-bit architectures. (At least, as far as I can
+// see from the assembly generated by LLVM, this is also required for MIPS64 N32
+// ABI. I don't know about the RISC-V s64ilp32 ABI for which a patch was
+// recently submitted to the kernel, but in any case, this should be a safe
+// default for such ABIs).
+//
+// Known architectures that have such ABI are x86_64 (X32), aarch64 (ILP32),
+// mips64 (N32), and riscv64 (s64ilp32, not merged yet though). (As of
+// 2023-06-05, only the former two are supported by rustc.) However, we list all
+// known 64-bit architectures because similar ABIs may exist or future added for
+// other architectures.
+#[cfg(all(
+    target_pointer_width = "32",
+    any(
+        target_arch = "aarch64",
+        target_arch = "bpf",
+        target_arch = "loongarch64",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "nvptx64",
+        target_arch = "powerpc64",
+        target_arch = "riscv64",
+        target_arch = "s390x",
+        target_arch = "sparc64",
+        target_arch = "wasm64",
+        target_arch = "x86_64",
+    ),
+))]
+macro_rules! ptr_reg {
+    ($ptr:ident) => {{
+        let _: *const _ = $ptr; // ensure $ptr is a pointer (*mut _ or *const _)
+        #[cfg(not(portable_atomic_no_asm_maybe_uninit))]
+        #[allow(clippy::ptr_as_ptr)]
+        {
+            // If we cast to u64 here, the provenance will be lost,
+            // so we convert to MaybeUninit<u64> via zero extend helper.
+            crate::utils::zero_extend64_ptr($ptr as *mut ())
+        }
+        #[cfg(portable_atomic_no_asm_maybe_uninit)]
+        {
+            // Use cast on old rustc because it does not support MaybeUninit
+            // registers. This is still permissive-provenance compatible and
+            // is sound.
+            $ptr as u64
+        }
+    }};
+}
+#[cfg(not(all(
+    target_pointer_width = "32",
+    any(
+        target_arch = "aarch64",
+        target_arch = "bpf",
+        target_arch = "loongarch64",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "nvptx64",
+        target_arch = "powerpc64",
+        target_arch = "riscv64",
+        target_arch = "s390x",
+        target_arch = "sparc64",
+        target_arch = "wasm64",
+        target_arch = "x86_64",
+    ),
+)))]
+macro_rules! ptr_reg {
+    ($ptr:ident) => {{
+        let _: *const _ = $ptr; // ensure $ptr is a pointer (*mut _ or *const _)
+        $ptr // cast is unnecessary here.
+    }};
+}
+
+// Some 64-bit architectures have ABI with 32-bit pointer width (e.g., x86_64 X32 ABI,
+// AArch64 ILP32 ABI, MIPS64 N32 ABI). On those targets, AtomicU64 is available
+// and fast, so use it to implement normal sequence lock.
+//
+// See ptr_reg macro for the reason why all known 64-bit architectures are listed.
+#[cfg(feature = "fallback")]
+#[cfg(any(
+    not(any(target_pointer_width = "16", target_pointer_width = "32")), // i.e., 64-bit or greater
+    target_arch = "aarch64",
+    target_arch = "bpf",
+    target_arch = "loongarch64",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "nvptx64",
+    target_arch = "powerpc64",
+    target_arch = "riscv64",
+    target_arch = "s390x",
+    target_arch = "sparc64",
+    target_arch = "wasm64",
+    target_arch = "x86_64",
+))]
+#[macro_use]
+mod fast_atomic_64_macros {
+    macro_rules! cfg_has_fast_atomic_64 {
+        ($($tt:tt)*) => {
+            $($tt)*
+        };
+    }
+    macro_rules! cfg_no_fast_atomic_64 {
+        ($($tt:tt)*) => {};
+    }
+}
+#[cfg(feature = "fallback")]
+#[cfg(not(any(
+    not(any(target_pointer_width = "16", target_pointer_width = "32")), // i.e., 64-bit or greater
+    target_arch = "aarch64",
+    target_arch = "bpf",
+    target_arch = "loongarch64",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "nvptx64",
+    target_arch = "powerpc64",
+    target_arch = "riscv64",
+    target_arch = "s390x",
+    target_arch = "sparc64",
+    target_arch = "wasm64",
+    target_arch = "x86_64",
+)))]
+#[macro_use]
+mod fast_atomic_64_macros {
+    macro_rules! cfg_has_fast_atomic_64 {
+        ($($tt:tt)*) => {};
+    }
+    macro_rules! cfg_no_fast_atomic_64 {
+        ($($tt:tt)*) => {
+            $($tt)*
+        };
+    }
+}