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/parisc/kernel/stacktrace.c | 63 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 arch/parisc/kernel/stacktrace.c

(limited to 'arch/parisc/kernel/stacktrace.c')

diff --git a/arch/parisc/kernel/stacktrace.c b/arch/parisc/kernel/stacktrace.c
new file mode 100644
index 000000000..2fe914c5f
--- /dev/null
+++ b/arch/parisc/kernel/stacktrace.c
@@ -0,0 +1,63 @@
+/*
+ * Stack trace management functions
+ *
+ *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
+ *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
+ *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
+ *
+ *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
+ */
+#include <linux/module.h>
+#include <linux/stacktrace.h>
+
+#include <asm/unwind.h>
+
+static void dump_trace(struct task_struct *task, struct stack_trace *trace)
+{
+	struct unwind_frame_info info;
+
+	/* initialize unwind info */
+	if (task == current) {
+		unsigned long sp;
+		struct pt_regs r;
+HERE:
+		asm volatile ("copy %%r30, %0" : "=r"(sp));
+		memset(&r, 0, sizeof(struct pt_regs));
+		r.iaoq[0] = (unsigned long)&&HERE;
+		r.gr[2] = (unsigned long)__builtin_return_address(0);
+		r.gr[30] = sp;
+		unwind_frame_init(&info, task, &r);
+	} else {
+		unwind_frame_init_from_blocked_task(&info, task);
+	}
+
+	/* unwind stack and save entries in stack_trace struct */
+	trace->nr_entries = 0;
+	while (trace->nr_entries < trace->max_entries) {
+		if (unwind_once(&info) < 0 || info.ip == 0)
+			break;
+
+		if (__kernel_text_address(info.ip))
+			trace->entries[trace->nr_entries++] = info.ip;
+	}
+}
+
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+void save_stack_trace(struct stack_trace *trace)
+{
+	dump_trace(current, trace);
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+	dump_trace(tsk, trace);
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
-- 
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