1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/rust/crash-context/src/windows/ffi.rs b/third_party/rust/crash-context/src/windows/ffi.rs
new file mode 100644
index 0000000000..96c88ce0ab
--- /dev/null
+++ b/third_party/rust/crash-context/src/windows/ffi.rs
@@ -0,0 +1,49 @@
+//! Custom bindings to `CONTEXT` and some structures that relate to it, to both
+//! deal with bugs in bindings, as well as not be dependent particularly on
+//! `windows-sys` due the massive amount of version churn that crate introduces.
+//!
+//! Both [`winapi`](https://docs.rs/winapi/latest/winapi/) and
+//! [`windows-sys`](https://docs.rs/windows-sys/latest/windows_sys/) have
+//! incorrect bindings with regards to `CONTEXT` and its related structures.
+//! These structures **must** be aligned to 16 bytes, but [are not](https://github.com/microsoft/win32metadata/issues/1044).
+
+#![allow(non_snake_case)]
+
+extern "C" {
+    /// Reimplementation of [`RtlCaptureContext`](https://learn.microsoft.com/en-us/windows/win32/api/winnt/nf-winnt-rtlcapturecontext)
+    ///
+    /// As noted above, the structures from `winapi` and `windows-sys` have
+    /// incorrect alignment.
+    ///
+    /// In addition, `RtlCaptureContext` only captures the state of the integer
+    /// registers, while this implementation additionally captures floating point
+    /// and vector state.
+    ///
+    /// The implementation is ported from Crashpad.
+    ///
+    /// - [x86](https://github.com/chromium/crashpad/blob/f742c1aa4aff1834dc55e97895f8cdfdfc945a21/util/misc/capture_context_win.asm)
+    /// - [aarch64](https://github.com/chromium/crashpad/blob/f742c1aa4aff1834dc55e97895f8cdfdfc945a21/util/misc/capture_context_win_arm64.asm)
+    pub fn capture_context(ctx: *mut CONTEXT);
+}
+
+pub use winapi::um::winnt::EXCEPTION_RECORD;
+
+cfg_if::cfg_if! {
+    if #[cfg(target_arch = "x86_64")] {
+        mod x86_64;
+        pub use x86_64::*;
+    } else if #[cfg(target_arch = "x86")] {
+        compile_error!("Please file an issue if you care about this target");
+        //mod x86;
+    } else if #[cfg(target_arch = "aarch64")] {
+        mod aarch64;
+        pub use aarch64::*;
+    }
+}
+
+#[derive(Copy, Clone)]
+#[repr(C)]
+pub struct EXCEPTION_POINTERS {
+    pub ExceptionRecord: *mut EXCEPTION_RECORD,
+    pub ContextRecord: *mut CONTEXT,
+}