sh: dwarf unwinder support.

This is a first cut at a generic DWARF unwinder for the kernel. It's
still lacking DWARF64 support and the DWARF expression support hasn't
been tested very well but it is generating proper stacktraces on SH for
WARN_ON() and NULL dereferences.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 278c68c60488..2bb43dc74f22 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -14,6 +14,7 @@
 #include <asm/processor.h>
 #include <asm/machvec.h>
 #include <asm/uaccess.h>
+#include <asm/dwarf.h>
 #include <asm/thread_info.h>
 #include <cpu/mmu_context.h>
 
@@ -261,6 +262,9 @@ void __init init_IRQ(void)
                 sh_mv.mv_init_irq();
 
         irq_ctx_init(smp_processor_id());
+
+        /* This needs to be early, but not too early.. */
+        dwarf_unwinder_init();
 }
 
 #ifdef CONFIG_SPARSE_IRQ