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| author | Paul Mundt <lethal@linux-sh.org> | 2006-12-08 11:41:43 +0300 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2006-12-12 02:42:08 +0300 |
| commit | dc34d312c7b25d5d0f54c16d143a9526936e5d38 (patch) | |
| tree | 3f409a98a130e688ffbe7787f18166b2a29f08a4 /arch/sh/kernel/process.c | |
| parent | 1b73e6ae45d0353a062d7bea707757a235473cf9 (diff) | |
| download | linux-dc34d312c7b25d5d0f54c16d143a9526936e5d38.tar.xz | |
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.c | 10 |
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); } |