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authorPaul Mundt <lethal@linux-sh.org>2006-12-08 17:41:43 +0900
committerPaul Mundt <lethal@linux-sh.org>2006-12-12 08:42:08 +0900
commitdc34d312c7b25d5d0f54c16d143a9526936e5d38 (patch)
tree3f409a98a130e688ffbe7787f18166b2a29f08a4 /arch/sh/kernel/process.c
parent1b73e6ae45d0353a062d7bea707757a235473cf9 (diff)
sh: BUG() handling through trapa vector.
Previously we haven't been doing anything with verbose BUG() reporting, and we've been relying on the oops path for handling BUG()'s, which is rather sub-optimal. This switches BUG handling to use a fixed trapa vector (#0x3e) where we construct a small bug frame post trapa instruction to get the context right. This also makes it trivial to wire up a DIE_BUG for the atomic die chain, which we couldn't really do before. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/process.c')
-rw-r--r--arch/sh/kernel/process.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index f3e2631be144..7347f6afa030 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -498,6 +498,16 @@ asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5,
{
struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
+ /* Rewind */
regs->pc -= 2;
+
+#ifdef CONFIG_BUG
+ if (__kernel_text_address(instruction_pointer(regs))) {
+ u16 insn = *(u16 *)instruction_pointer(regs);
+ if (insn == TRAPA_BUG_OPCODE)
+ handle_BUG(regs);
+ }
+#endif
+
force_sig(SIGTRAP, current);
}