sh: Setup the frame register in asm code

[safe/jmp/linux-2.6] / arch / sh / include / asm / entry-macros.S

diff --git a/arch/sh/include/asm/entry-macros.S b/arch/sh/include/asm/entry-macros.S
index 1bdd938..64fd0de 100644 (file)
--- a/arch/sh/include/asm/entry-macros.S
+++ b/arch/sh/include/asm/entry-macros.S
@@ -108,3 +108,15 @@
 #else
 # define PREF(x)       nop
 #endif
+
+       /*
+        * Macro for use within assembly. Because the DWARF unwinder
+        * needs to use the frame register to unwind the stack, we
+        * need to setup r14 with the value of the stack pointer as
+        * the return address is usually on the stack somewhere.
+        */
+       .macro  setup_frame_reg
+#ifdef CONFIG_DWARF_UNWINDER
+       mov     r15, r14
+#endif
+       .endm