From d2e1446d81725c351dc73a03b397ce043fb18452 Mon Sep 17 00:00:00 2001
From: Meizu OpenSource <patchwork@meizu.com>
Date: Mon, 15 Aug 2016 10:19:42 +0800
Subject: first commit

---
 arch/mips/include/asm/stacktrace.h | 52 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 arch/mips/include/asm/stacktrace.h

(limited to 'arch/mips/include/asm/stacktrace.h')

diff --git a/arch/mips/include/asm/stacktrace.h b/arch/mips/include/asm/stacktrace.h
new file mode 100644
index 000000000..780ee2c2a
--- /dev/null
+++ b/arch/mips/include/asm/stacktrace.h
@@ -0,0 +1,52 @@
+#ifndef _ASM_STACKTRACE_H
+#define _ASM_STACKTRACE_H
+
+#include <asm/ptrace.h>
+
+#ifdef CONFIG_KALLSYMS
+extern int raw_show_trace;
+extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
+				  unsigned long pc, unsigned long *ra);
+extern unsigned long unwind_stack_by_address(unsigned long stack_page,
+					     unsigned long *sp,
+					     unsigned long pc,
+					     unsigned long *ra);
+#else
+#define raw_show_trace 1
+static inline unsigned long unwind_stack(struct task_struct *task,
+	unsigned long *sp, unsigned long pc, unsigned long *ra)
+{
+	return 0;
+}
+#endif
+
+static __always_inline void prepare_frametrace(struct pt_regs *regs)
+{
+#ifndef CONFIG_KALLSYMS
+	/*
+	 * Remove any garbage that may be in regs (specially func
+	 * addresses) to avoid show_raw_backtrace() to report them
+	 */
+	memset(regs, 0, sizeof(*regs));
+#endif
+	__asm__ __volatile__(
+		".set push\n\t"
+		".set noat\n\t"
+#ifdef CONFIG_64BIT
+		"1: dla $1, 1b\n\t"
+		"sd $1, %0\n\t"
+		"sd $29, %1\n\t"
+		"sd $31, %2\n\t"
+#else
+		"1: la $1, 1b\n\t"
+		"sw $1, %0\n\t"
+		"sw $29, %1\n\t"
+		"sw $31, %2\n\t"
+#endif
+		".set pop\n\t"
+		: "=m" (regs->cp0_epc),
+		"=m" (regs->regs[29]), "=m" (regs->regs[31])
+		: : "memory");
+}
+
+#endif /* _ASM_STACKTRACE_H */
-- 
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