diff --git a/core/src/ffi/c_str.rs b/core/src/ffi/c_str.rs
index c9111254082da..ae42ae3baf418 100644
--- a/core/src/ffi/c_str.rs
+++ b/core/src/ffi/c_str.rs
@@ -94,7 +94,7 @@ use crate::str;
 /// ```
 ///
 /// [str]: prim@str "str"
-#[derive(Hash)]
+#[derive(PartialEq, Eq, Hash)]
 #[stable(feature = "core_c_str", since = "1.64.0")]
 #[rustc_has_incoherent_inherent_impls]
 #[lang = "CStr"]
@@ -104,7 +104,6 @@ use crate::str;
 // want `repr(transparent)` but we don't want it to show up in rustdoc, so we hide it under
 // `cfg(doc)`. This is an ad-hoc implementation of attribute privacy.
 #[repr(transparent)]
-#[allow(clippy::derived_hash_with_manual_eq)]
 pub struct CStr {
     // FIXME: this should not be represented with a DST slice but rather with
     //        just a raw `c_char` along with some form of marker to make
@@ -678,15 +677,9 @@ impl CStr {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl PartialEq for CStr {
-    #[inline]
-    fn eq(&self, other: &CStr) -> bool {
-        self.to_bytes().eq(other.to_bytes())
-    }
-}
-#[stable(feature = "rust1", since = "1.0.0")]
-impl Eq for CStr {}
+// `.to_bytes()` representations are compared instead of the inner `[c_char]`s,
+// because `c_char` is `i8` (not `u8`) on some platforms.
+// That is why this is implemented manually and not derived.
 #[stable(feature = "rust1", since = "1.0.0")]
 impl PartialOrd for CStr {
     #[inline]
diff --git a/core/tests/ffi.rs b/core/tests/ffi.rs
new file mode 100644
index 0000000000000..2b33fbd95f073
--- /dev/null
+++ b/core/tests/ffi.rs
@@ -0,0 +1 @@
+mod cstr;
diff --git a/core/tests/ffi/cstr.rs b/core/tests/ffi/cstr.rs
new file mode 100644
index 0000000000000..9bf4c21a9ab97
--- /dev/null
+++ b/core/tests/ffi/cstr.rs
@@ -0,0 +1,15 @@
+use core::ffi::CStr;
+
+#[test]
+fn compares_as_u8s() {
+    let a: &CStr = c"Hello!"; // Starts with ascii
+    let a_bytes: &[u8] = a.to_bytes();
+    assert!((..0b1000_0000).contains(&a_bytes[0]));
+
+    let b: &CStr = c"こんにちは！"; // Starts with non ascii
+    let b_bytes: &[u8] = b.to_bytes();
+    assert!((0b1000_0000..).contains(&b_bytes[0]));
+
+    assert_eq!(Ord::cmp(a, b), Ord::cmp(a_bytes, b_bytes));
+    assert_eq!(PartialOrd::partial_cmp(a, b), PartialOrd::partial_cmp(a_bytes, b_bytes));
+}
diff --git a/core/tests/lib.rs b/core/tests/lib.rs
index 83a615fcd8be3..04aaa3f35b7ae 100644
--- a/core/tests/lib.rs
+++ b/core/tests/lib.rs
@@ -132,6 +132,7 @@ mod clone;
 mod cmp;
 mod const_ptr;
 mod convert;
+mod ffi;
 mod fmt;
 mod future;
 mod hash;
diff --git a/std/src/sys/pal/windows/c.rs b/std/src/sys/pal/windows/c.rs
index 8ebcf10dd1f2e..f7ec17fde22ea 100644
--- a/std/src/sys/pal/windows/c.rs
+++ b/std/src/sys/pal/windows/c.rs
@@ -276,44 +276,3 @@ compat_fn_with_fallback! {
         Status as u32
     }
 }
-
-// # Arm32 shim
-//
-// AddVectoredExceptionHandler and WSAStartup use platform-specific types.
-// However, Microsoft no longer supports thumbv7a so definitions for those targets
-// are not included in the win32 metadata. We work around that by defining them here.
-//
-// Where possible, these definitions should be kept in sync with https://docs.rs/windows-sys
-cfg_if::cfg_if! {
-if #[cfg(not(target_vendor = "uwp"))] {
-    #[link(name = "kernel32")]
-    extern "system" {
-        pub fn AddVectoredExceptionHandler(
-            first: u32,
-            handler: PVECTORED_EXCEPTION_HANDLER,
-        ) -> *mut c_void;
-    }
-    pub type PVECTORED_EXCEPTION_HANDLER = Option<
-        unsafe extern "system" fn(exceptioninfo: *mut EXCEPTION_POINTERS) -> i32,
-    >;
-    #[repr(C)]
-    pub struct EXCEPTION_POINTERS {
-        pub ExceptionRecord: *mut EXCEPTION_RECORD,
-        pub ContextRecord: *mut CONTEXT,
-    }
-    #[cfg(target_arch = "arm")]
-    pub enum CONTEXT {}
-}}
-// WSAStartup is only redefined here so that we can override WSADATA for Arm32
-windows_targets::link!("ws2_32.dll" "system" fn WSAStartup(wversionrequested: u16, lpwsadata: *mut WSADATA) -> i32);
-#[cfg(target_arch = "arm")]
-#[repr(C)]
-pub struct WSADATA {
-    pub wVersion: u16,
-    pub wHighVersion: u16,
-    pub szDescription: [u8; 257],
-    pub szSystemStatus: [u8; 129],
-    pub iMaxSockets: u16,
-    pub iMaxUdpDg: u16,
-    pub lpVendorInfo: PSTR,
-}
diff --git a/std/src/sys/pal/windows/c/bindings.txt b/std/src/sys/pal/windows/c/bindings.txt
index de4f1050e927a..afacc370c3420 100644
--- a/std/src/sys/pal/windows/c/bindings.txt
+++ b/std/src/sys/pal/windows/c/bindings.txt
@@ -2176,6 +2176,7 @@ Windows.Win32.Networking.WinSock.WSARecv
 Windows.Win32.Networking.WinSock.WSASend
 Windows.Win32.Networking.WinSock.WSASERVICE_NOT_FOUND
 Windows.Win32.Networking.WinSock.WSASocketW
+Windows.Win32.Networking.WinSock.WSAStartup
 Windows.Win32.Networking.WinSock.WSASYSCALLFAILURE
 Windows.Win32.Networking.WinSock.WSASYSNOTREADY
 Windows.Win32.Networking.WinSock.WSATRY_AGAIN
@@ -2420,6 +2421,7 @@ Windows.Win32.System.Console.STD_HANDLE
 Windows.Win32.System.Console.STD_INPUT_HANDLE
 Windows.Win32.System.Console.STD_OUTPUT_HANDLE
 Windows.Win32.System.Console.WriteConsoleW
+Windows.Win32.System.Diagnostics.Debug.AddVectoredExceptionHandler
 Windows.Win32.System.Diagnostics.Debug.ARM64_NT_NEON128
 Windows.Win32.System.Diagnostics.Debug.CONTEXT
 Windows.Win32.System.Diagnostics.Debug.EXCEPTION_RECORD
diff --git a/std/src/sys/pal/windows/c/windows_sys.rs b/std/src/sys/pal/windows/c/windows_sys.rs
index 29110bde3b4c4..9f22f54819509 100644
--- a/std/src/sys/pal/windows/c/windows_sys.rs
+++ b/std/src/sys/pal/windows/c/windows_sys.rs
@@ -5,6 +5,7 @@ windows_targets::link!("advapi32.dll" "system" fn OpenProcessToken(processhandle
 windows_targets::link!("advapi32.dll" "system" "SystemFunction036" fn RtlGenRandom(randombuffer : *mut core::ffi::c_void, randombufferlength : u32) -> BOOLEAN);
 windows_targets::link!("kernel32.dll" "system" fn AcquireSRWLockExclusive(srwlock : *mut SRWLOCK));
 windows_targets::link!("kernel32.dll" "system" fn AcquireSRWLockShared(srwlock : *mut SRWLOCK));
+windows_targets::link!("kernel32.dll" "system" fn AddVectoredExceptionHandler(first : u32, handler : PVECTORED_EXCEPTION_HANDLER) -> *mut core::ffi::c_void);
 windows_targets::link!("kernel32.dll" "system" fn CancelIo(hfile : HANDLE) -> BOOL);
 windows_targets::link!("kernel32.dll" "system" fn CloseHandle(hobject : HANDLE) -> BOOL);
 windows_targets::link!("kernel32.dll" "system" fn CompareStringOrdinal(lpstring1 : PCWSTR, cchcount1 : i32, lpstring2 : PCWSTR, cchcount2 : i32, bignorecase : BOOL) -> COMPARESTRING_RESULT);
@@ -114,6 +115,7 @@ windows_targets::link!("ws2_32.dll" "system" fn WSAGetLastError() -> WSA_ERROR);
 windows_targets::link!("ws2_32.dll" "system" fn WSARecv(s : SOCKET, lpbuffers : *const WSABUF, dwbuffercount : u32, lpnumberofbytesrecvd : *mut u32, lpflags : *mut u32, lpoverlapped : *mut OVERLAPPED, lpcompletionroutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE) -> i32);
 windows_targets::link!("ws2_32.dll" "system" fn WSASend(s : SOCKET, lpbuffers : *const WSABUF, dwbuffercount : u32, lpnumberofbytessent : *mut u32, dwflags : u32, lpoverlapped : *mut OVERLAPPED, lpcompletionroutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE) -> i32);
 windows_targets::link!("ws2_32.dll" "system" fn WSASocketW(af : i32, r#type : i32, protocol : i32, lpprotocolinfo : *const WSAPROTOCOL_INFOW, g : u32, dwflags : u32) -> SOCKET);
+windows_targets::link!("ws2_32.dll" "system" fn WSAStartup(wversionrequested : u16, lpwsadata : *mut WSADATA) -> i32);
 windows_targets::link!("ws2_32.dll" "system" fn accept(s : SOCKET, addr : *mut SOCKADDR, addrlen : *mut i32) -> SOCKET);
 windows_targets::link!("ws2_32.dll" "system" fn bind(s : SOCKET, name : *const SOCKADDR, namelen : i32) -> i32);
 windows_targets::link!("ws2_32.dll" "system" fn closesocket(s : SOCKET) -> i32);
@@ -2284,6 +2286,12 @@ pub type EXCEPTION_DISPOSITION = i32;
 pub const EXCEPTION_MAXIMUM_PARAMETERS: u32 = 15u32;
 #[repr(C)]
 #[derive(Clone, Copy)]
+pub struct EXCEPTION_POINTERS {
+    pub ExceptionRecord: *mut EXCEPTION_RECORD,
+    pub ContextRecord: *mut CONTEXT,
+}
+#[repr(C)]
+#[derive(Clone, Copy)]
 pub struct EXCEPTION_RECORD {
     pub ExceptionCode: NTSTATUS,
     pub ExceptionFlags: u32,
@@ -2860,6 +2868,8 @@ pub type PTIMERAPCROUTINE = Option<
         dwtimerhighvalue: u32,
     ),
 >;
+pub type PVECTORED_EXCEPTION_HANDLER =
+    Option<unsafe extern "system" fn(exceptioninfo: *mut EXCEPTION_POINTERS) -> i32>;
 pub type PWSTR = *mut u16;
 pub const READ_CONTROL: FILE_ACCESS_RIGHTS = 131072u32;
 pub const REALTIME_PRIORITY_CLASS: PROCESS_CREATION_FLAGS = 256u32;
@@ -3292,5 +3302,19 @@ pub struct XSAVE_FORMAT {
     pub XmmRegisters: [M128A; 8],
     pub Reserved4: [u8; 224],
 }
+
+#[cfg(target_arch = "arm")]
+#[repr(C)]
+pub struct WSADATA {
+    pub wVersion: u16,
+    pub wHighVersion: u16,
+    pub szDescription: [u8; 257],
+    pub szSystemStatus: [u8; 129],
+    pub iMaxSockets: u16,
+    pub iMaxUdpDg: u16,
+    pub lpVendorInfo: PSTR,
+}
+#[cfg(target_arch = "arm")]
+pub enum CONTEXT {}
 // ignore-tidy-filelength
 use super::windows_targets;