[lucet-runtime-internals] add UContext support for FreeBSD

Author: valpackett

lucet-runtime/lucet-runtime-internals/src/sysdeps/freebsd.rs

@@ -0,0 +1,50 @@
+use libc::{c_void, ucontext_t};
+
+#[derive(Clone, Copy, Debug)]
+pub struct UContextPtr(*const ucontext_t);
+
+impl UContextPtr {
+    #[inline]
+    pub fn new(ptr: *const c_void) -> Self {
+        assert!(!ptr.is_null(), "non-null context");
+        UContextPtr(ptr as *const ucontext_t)
+    }
+
+    #[inline]
+    pub fn get_ip(self) -> *const c_void {
+        let mcontext = &unsafe { *(self.0) }.uc_mcontext;
+        mcontext.mc_rip as *const _
+    }
+}
+
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct UContext {
+    context: ucontext_t,
+}
+
+impl UContext {
+    #[inline]
+    pub fn new(ptr: *const c_void) -> Self {
+        UContext {
+            context: *unsafe {
+                (ptr as *const ucontext_t)
+                    .as_ref()
+                    .expect("non-null context")
+            },
+        }
+    }
+
+    pub fn as_ptr(&mut self) -> UContextPtr {
+        UContextPtr::new(&self.context as *const _ as *const _)
+    }
+}
+
+impl Into<UContext> for UContextPtr {
+    #[inline]
+    fn into(self) -> UContext {
+        UContext {
+            context: unsafe { *(self.0) },
+        }
+    }
+}

lucet-runtime/lucet-runtime-internals/src/sysdeps/mod.rs

@@ -4,8 +4,14 @@ mod macos;
 #[cfg(target_os = "linux")]
 mod linux;
 
+#[cfg(target_os = "freebsd")]
+mod freebsd;
+
 #[cfg(target_os = "macos")]
 pub use macos::*;
 
 #[cfg(target_os = "linux")]
 pub use linux::*;
+
+#[cfg(target_os = "freebsd")]
+pub use freebsd::*;