1 files changed, 38 insertions, 0 deletions
diff --git a/libgo/go/runtime/os_gccgo.go b/libgo/go/runtime/os_gccgo.go
index 4609432..f45ab25 100644
--- a/libgo/go/runtime/os_gccgo.go
+++ b/libgo/go/runtime/os_gccgo.go
@@ -8,6 +8,44 @@ import (
 	"unsafe"
 )
 
+// Temporary for C code to call:
+//go:linkname minit runtime.minit
+
+// minit is called to initialize a new m (including the bootstrap m).
+// Called on the new thread, cannot allocate memory.
+func minit() {
+	// Initialize signal handling.
+	_g_ := getg()
+
+	var st _stack_t
+	sigaltstack(nil, &st)
+	if st.ss_flags&_SS_DISABLE != 0 {
+		signalstack(_g_.m.gsignalstack, _g_.m.gsignalstacksize)
+		_g_.m.newSigstack = true
+	} else {
+		_g_.m.newSigstack = false
+	}
+
+	// FIXME: We should set _g_.m.procid here.
+
+	// restore signal mask from m.sigmask and unblock essential signals
+	nmask := _g_.m.sigmask
+	for i := range sigtable {
+		if sigtable[i].flags&_SigUnblock != 0 {
+			sigdelset(&nmask, int32(i))
+		}
+	}
+	sigprocmask(_SIG_SETMASK, &nmask, nil)
+}
+
+// Called from dropm to undo the effect of an minit.
+//go:nosplit
+func unminit() {
+	if getg().m.newSigstack {
+		signalstack(nil, 0)
+	}
+}
+
 var urandom_dev = []byte("/dev/urandom\x00")
 
 func getRandomData(r []byte) {