From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/um/kernel/sysrq.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 arch/um/kernel/sysrq.c

(limited to 'arch/um/kernel/sysrq.c')

diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
new file mode 100644
index 000000000..aa1b56f5a
--- /dev/null
+++ b/arch/um/kernel/sysrq.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kallsyms.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <asm/sysrq.h>
+#include <asm/stacktrace.h>
+#include <os.h>
+
+static void _print_addr(void *data, unsigned long address, int reliable)
+{
+	pr_info(" [<%08lx>]", address);
+	pr_cont(" %s", reliable ? "" : "? ");
+	print_symbol("%s", address);
+	pr_cont("\n");
+}
+
+static const struct stacktrace_ops stackops = {
+	.address = _print_addr
+};
+
+void show_stack(struct task_struct *task, unsigned long *stack)
+{
+	unsigned long *sp = stack;
+	struct pt_regs *segv_regs = current->thread.segv_regs;
+	int i;
+
+	if (!segv_regs && os_is_signal_stack()) {
+		pr_err("Received SIGSEGV in SIGSEGV handler,"
+				" aborting stack trace!\n");
+		return;
+	}
+
+	if (!stack)
+		sp = get_stack_pointer(task, segv_regs);
+
+	pr_info("Stack:\n");
+	stack = sp;
+	for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
+		if (kstack_end(stack))
+			break;
+		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
+			pr_cont("\n");
+		pr_cont(" %08lx", *stack++);
+	}
+	pr_cont("\n");
+
+	pr_info("Call Trace:\n");
+	dump_trace(current, &stackops, NULL);
+	pr_info("\n");
+}
-- 
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