1 files changed, 46 insertions, 0 deletions
diff --git a/library/std/src/sys/sgx/alloc.rs b/library/std/src/sys/sgx/alloc.rs
new file mode 100644
index 00000000000..40daec758a9
--- /dev/null
+++ b/library/std/src/sys/sgx/alloc.rs
@@ -0,0 +1,46 @@
+use crate::alloc::{GlobalAlloc, Layout, System};
+
+use super::waitqueue::SpinMutex;
+
+// Using a SpinMutex because we never want to exit the enclave waiting for the
+// allocator.
+#[cfg_attr(test, linkage = "available_externally")]
+#[export_name = "_ZN16__rust_internals3std3sys3sgx5alloc8DLMALLOCE"]
+static DLMALLOC: SpinMutex<dlmalloc::Dlmalloc> = SpinMutex::new(dlmalloc::DLMALLOC_INIT);
+
+#[stable(feature = "alloc_system_type", since = "1.28.0")]
+unsafe impl GlobalAlloc for System {
+    #[inline]
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        DLMALLOC.lock().malloc(layout.size(), layout.align())
+    }
+
+    #[inline]
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
+        DLMALLOC.lock().calloc(layout.size(), layout.align())
+    }
+
+    #[inline]
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+        DLMALLOC.lock().free(ptr, layout.size(), layout.align())
+    }
+
+    #[inline]
+    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
+        DLMALLOC.lock().realloc(ptr, layout.size(), layout.align(), new_size)
+    }
+}
+
+// The following functions are needed by libunwind. These symbols are named
+// in pre-link args for the target specification, so keep that in sync.
+#[cfg(not(test))]
+#[no_mangle]
+pub unsafe extern "C" fn __rust_c_alloc(size: usize, align: usize) -> *mut u8 {
+    crate::alloc::alloc(Layout::from_size_align_unchecked(size, align))
+}
+
+#[cfg(not(test))]
+#[no_mangle]
+pub unsafe extern "C" fn __rust_c_dealloc(ptr: *mut u8, size: usize, align: usize) {
+    crate::alloc::dealloc(ptr, Layout::from_size_align_unchecked(size, align))
+}