sh: Use a jump call table for debug trap handlers.

This rips out most of the needlessly complicated sh_bios and kgdb
trap handling, and forces it all through a common fast dispatch path.
As more debug traps are inserted, it's important to keep them in sync
for all of the parts, not just SH-3/4.

As the SH-2 parts are unable to do traps in the >= 0x40 range, we
restrict the debug traps to the 0x30-0x3f range on all parts, and
also bump the kgdb breakpoint trap down in to this range (from 0xff
to 0x3c) so it's possible to use for nommu.

Optionally, this table can be padded out to catch spurious traps for
SH-3/4, but we don't do that yet..

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/asm-sh/kgdb.h b/include/asm-sh/kgdb.h
index 7b26f53fe343..0095c665d272 100644
--- a/include/asm-sh/kgdb.h
+++ b/include/asm-sh/kgdb.h
@@ -85,10 +85,10 @@ extern int     setjmp(jmp_buf __jmpb);
 #define KGDB_PRINTK(...) printk("KGDB: " __VA_ARGS__)
 
 /* Forced breakpoint */
-#define BREAKPOINT() do {                                     \
-  if (kgdb_enabled) {                                         \
-    asm volatile("trapa   #0xff");                            \
-  }                                                           \
+#define BREAKPOINT()                                    \
+do {                                                    \
+        if (kgdb_enabled)                               \
+                __asm__ __volatile__("trapa   #0x3c");  \
 } while (0)
 
 /* KGDB should be able to flush all kernel text space */