parisc: add CALLER_ADDR{0-6} macros

Signed-off-by: Helge Deller <[e-mail]>
Signed-off-by: Kyle McMartin <[e-mail]>

arch/parisc/include/asm/ftrace.h

···
  * Defined in entry.S
  */
 extern void return_to_handler(void);
+
+
+extern unsigned long return_address(unsigned int);
+
+#define HAVE_ARCH_CALLER_ADDR
+
+#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
+#define CALLER_ADDR1 return_address(1)
+#define CALLER_ADDR2 return_address(2)
+#define CALLER_ADDR3 return_address(3)
+#define CALLER_ADDR4 return_address(4)
+#define CALLER_ADDR5 return_address(5)
+#define CALLER_ADDR6 return_address(6)
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_PARISC_FTRACE_H */

arch/parisc/kernel/unwind.c

···
 
 	return ret;
 }
+
+unsigned long return_address(unsigned int level)
+{
+	struct unwind_frame_info info;
+	struct pt_regs r;
+	unsigned long sp;
+
+	/* initialize unwind info */
+	asm volatile ("copy %%r30, %0" : "=r"(sp));
+	memset(&r, 0, sizeof(struct pt_regs));
+	r.iaoq[0] = (unsigned long) current_text_addr();
+	r.gr[2] = (unsigned long) __builtin_return_address(0);
+	r.gr[30] = sp;
+	unwind_frame_init(&info, current, &r);
+
+	/* unwind stack */
+	++level;
+	do {
+		if (unwind_once(&info) < 0 || info.ip == 0)
+			return 0;
+		if (!__kernel_text_address(info.ip)) {
+			return 0;
+		}
+	} while (info.ip && level--);
+
+	return info.ip;
+}