[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/arch/x86/oprofile/backtrace.c b/src/kernel/linux/v4.14/arch/x86/oprofile/backtrace.c
new file mode 100644
index 0000000..a2488b6
--- /dev/null
+++ b/src/kernel/linux/v4.14/arch/x86/oprofile/backtrace.c
@@ -0,0 +1,127 @@
+/**
+ * @file backtrace.c
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon
+ * @author David Smith
+ */
+
+#include <linux/oprofile.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/compat.h>
+#include <linux/uaccess.h>
+
+#include <asm/ptrace.h>
+#include <asm/stacktrace.h>
+#include <asm/unwind.h>
+
+#ifdef CONFIG_COMPAT
+static struct stack_frame_ia32 *
+dump_user_backtrace_32(struct stack_frame_ia32 *head)
+{
+ /* Also check accessibility of one struct frame_head beyond: */
+ struct stack_frame_ia32 bufhead[2];
+ struct stack_frame_ia32 *fp;
+ unsigned long bytes;
+
+ bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
+ if (bytes != 0)
+ return NULL;
+
+ fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
+
+ oprofile_add_trace(bufhead[0].return_address);
+
+ /* frame pointers should strictly progress back up the stack
+ * (towards higher addresses) */
+ if (head >= fp)
+ return NULL;
+
+ return fp;
+}
+
+static inline int
+x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
+{
+ struct stack_frame_ia32 *head;
+
+ /* User process is IA32 */
+ if (!current || !test_thread_flag(TIF_IA32))
+ return 0;
+
+ head = (struct stack_frame_ia32 *) regs->bp;
+ while (depth-- && head)
+ head = dump_user_backtrace_32(head);
+
+ return 1;
+}
+
+#else
+static inline int
+x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
+{
+ return 0;
+}
+#endif /* CONFIG_COMPAT */
+
+static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
+{
+ /* Also check accessibility of one struct frame_head beyond: */
+ struct stack_frame bufhead[2];
+ unsigned long bytes;
+
+ bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
+ if (bytes != 0)
+ return NULL;
+
+ oprofile_add_trace(bufhead[0].return_address);
+
+ /* frame pointers should strictly progress back up the stack
+ * (towards higher addresses) */
+ if (head >= bufhead[0].next_frame)
+ return NULL;
+
+ return bufhead[0].next_frame;
+}
+
+void
+x86_backtrace(struct pt_regs * const regs, unsigned int depth)
+{
+ struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
+
+ if (!user_mode(regs)) {
+ struct unwind_state state;
+ unsigned long addr;
+
+ if (!depth)
+ return;
+
+ oprofile_add_trace(regs->ip);
+
+ if (!--depth)
+ return;
+
+ for (unwind_start(&state, current, regs, NULL);
+ !unwind_done(&state); unwind_next_frame(&state)) {
+ addr = unwind_get_return_address(&state);
+ if (!addr)
+ break;
+
+ oprofile_add_trace(addr);
+
+ if (!--depth)
+ break;
+ }
+
+ return;
+ }
+
+ if (x86_backtrace_32(regs, depth))
+ return;
+
+ while (depth-- && head)
+ head = dump_user_backtrace(head);
+}