1 files changed, 144 insertions, 0 deletions
diff --git a/libgo/go/runtime/signal_gccgo.go b/libgo/go/runtime/signal_gccgo.go
new file mode 100644
index 0000000000..b4257c9f97
--- /dev/null
+++ b/libgo/go/runtime/signal_gccgo.go
@@ -0,0 +1,144 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package runtime
+
+import (
+	"unsafe"
+)
+
+// Functions for gccgo to support signal handling. In the gc runtime
+// these are written in OS-specific files and in assembler.
+
+//extern sigaction
+func sigaction(signum uint32, act *_sigaction, oact *_sigaction) int32
+
+//extern sigprocmask
+func sigprocmask(how int32, set *sigset, oldset *sigset) int32
+
+//extern sigfillset
+func sigfillset(set *sigset) int32
+
+//extern sigemptyset
+func sigemptyset(set *sigset) int32
+
+//extern sigaddset
+func c_sigaddset(set *sigset, signum uint32) int32
+
+//extern sigdelset
+func c_sigdelset(set *sigset, signum uint32) int32
+
+//extern sigaltstack
+func sigaltstack(ss *_stack_t, oss *_stack_t) int32
+
+//extern raise
+func raise(sig uint32) int32
+
+//extern getpid
+func getpid() _pid_t
+
+//extern kill
+func kill(pid _pid_t, sig uint32) int32
+
+//extern setitimer
+func setitimer(which int32, new *_itimerval, old *_itimerval) int32
+
+type sigTabT struct {
+	flags int32
+	name  string
+}
+
+type sigctxt struct {
+	info *_siginfo_t
+	ctxt unsafe.Pointer
+}
+
+func (c *sigctxt) sigcode() uint64 {
+	if c.info == nil {
+		// This can happen on Solaris 10.  We don't know the
+		// code, just avoid a misleading value.
+		return _SI_USER + 1
+	}
+	return uint64(c.info.si_code)
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func setsig(i uint32, fn uintptr) {
+	var sa _sigaction
+	sa.sa_flags = _SA_SIGINFO | _SA_RESTART
+
+	// For gccgo we do not set SA_ONSTACK for a signal that can
+	// cause a panic.  Instead, we trust that the split stack has
+	// enough room to start the signal handler.  This is because
+	// otherwise we have no good way to switch back to the
+	// original stack before panicing.
+	if sigtable[i].flags&_SigPanic == 0 {
+		sa.sa_flags |= _SA_ONSTACK
+	}
+
+	sigfillset((*sigset)(unsafe.Pointer(&sa.sa_mask)))
+	setSigactionHandler(&sa, fn)
+	sigaction(i, &sa, nil)
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func setsigstack(i uint32) {
+	var sa _sigaction
+	sigaction(i, nil, &sa)
+	handler := getSigactionHandler(&sa)
+	if handler == 0 || handler == _SIG_DFL || handler == _SIG_IGN || sa.sa_flags&_SA_ONSTACK != 0 {
+		return
+	}
+	if sigtable[i].flags&_SigPanic != 0 {
+		return
+	}
+	sa.sa_flags |= _SA_ONSTACK
+	sigaction(i, &sa, nil)
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func getsig(i uint32) uintptr {
+	var sa _sigaction
+	if sigaction(i, nil, &sa) < 0 {
+		// On GNU/Linux glibc rejects attempts to call
+		// sigaction with signal 32 (SIGCANCEL) or 33 (SIGSETXID).
+		if GOOS == "linux" && (i == 32 || i == 33) {
+			return _SIG_DFL
+		}
+		throw("sigaction read failure")
+	}
+	return getSigactionHandler(&sa)
+}
+
+func signalstack(p unsafe.Pointer, n uintptr)
+
+//go:nosplit
+//go:nowritebarrierrec
+func raiseproc(sig uint32) {
+	kill(getpid(), sig)
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func sigfwd(fn uintptr, sig uint32, info *_siginfo_t, ctx unsafe.Pointer) {
+	f1 := [1]uintptr{fn}
+	f2 := &f1
+	f3 := *(*func(uint32, *_siginfo_t, unsafe.Pointer))(unsafe.Pointer(&f2))
+	f3(sig, info, ctx)
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func sigaddset(mask *sigset, i int) {
+	c_sigaddset(mask, uint32(i))
+}
+
+func sigdelset(mask *sigset, i int) {
+	c_sigdelset(mask, uint32(i))
+}