1 files changed, 13 insertions, 0 deletions
diff --git a/src/runtime/baremetal.go b/src/runtime/baremetal.go
index 173d0db25..aecb18972 100644
--- a/src/runtime/baremetal.go
+++ b/src/runtime/baremetal.go
@@ -86,3 +86,16 @@ func AdjustTimeOffset(offset int64) {
 	// TODO: do this atomically?
 	timeOffset += offset
 }
+
+// Picolibc is not configured to define its own errno value, instead it calls
+// __errno_location.
+// TODO: a global works well enough for now (same as errno on Linux with
+// -scheduler=tasks), but this should ideally be a thread-local variable stored
+// in task.Task.
+// Especially when we add multicore support for microcontrollers.
+var errno int32
+
+//export __errno_location
+func libc_errno_location() *int32 {
+	return &errno
+}