1 files changed, 97 insertions, 0 deletions
diff --git a/sys/powerpc/powerpc/stack_machdep.c b/sys/powerpc/powerpc/stack_machdep.c
new file mode 100644
index 0000000..7bc6fd4
--- /dev/null
+++ b/sys/powerpc/powerpc/stack_machdep.c
@@ -0,0 +1,97 @@
+/*-
+ * Copyright (c) 2005 Antoine Brodin
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/stack.h>
+#include <sys/systm.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_extern.h>
+
+#include <machine/db_machdep.h>
+#include <machine/pcb.h>
+#include <machine/spr.h>
+#include <machine/stack.h>
+#include <machine/trap.h>
+
+static void
+stack_capture(struct stack *st, register_t frame)
+{
+	vm_offset_t callpc;
+
+	stack_zero(st);
+	if (frame < PAGE_SIZE)
+		return;
+	while (1) {
+		frame = *(register_t *)frame;
+		if (frame < PAGE_SIZE)
+			break;
+		callpc = *(vm_offset_t *)(frame + 4) - 4;
+		if ((callpc & 3) || (callpc < 0x100))
+			break;
+
+		/*
+		 * Don't bother traversing trap-frames - there should
+		 * be enough info down to the frame to work out where
+		 * things are going wrong. Plus, prevents this shortened
+		 * version of code from accessing user-space frames
+		 */
+		if (callpc + 4 == (register_t) &trapexit ||
+		    callpc + 4 == (register_t) &asttrapexit)
+			break;
+
+		if (stack_put(st, callpc) == -1)
+			break;
+	}
+}
+
+void
+stack_save_td(struct stack *st, struct thread *td)
+{
+	register_t frame;
+
+	if (TD_IS_SWAPPED(td))
+		panic("stack_save_td: swapped");
+	if (TD_IS_RUNNING(td))
+		panic("stack_save_td: running");
+
+	frame = td->td_pcb->pcb_sp;
+	stack_capture(st, frame);
+}
+
+void
+stack_save(struct stack *st)
+{
+	register_t frame;
+
+	frame = (register_t)__builtin_frame_address(1);
+	stack_capture(st, frame);
+}