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powerpc: Add trap_nr to thread_struct 

Add thread_struct.trap_nr and use it to store the last exception
the thread experienced. In this patch, we populate the field at
various places where we force_sig_info() to the process.

This is also used in uprobes to determine if the probed instruction
caused an exception.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Ananth N Mavinakayanahalli 2012-08-23 21:27:09 +00:00 committed by Benjamin Herrenschmidt
parent 7118e7e648
commit 41ab5266c3
4 changed files with 5 additions and 0 deletions
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1
arch/powerpc/include/asm/processor.h
View File

@ -219,6 +219,7 @@ struct thread_struct {
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
#endif
unsigned long dabr; /* Data address breakpoint register */
unsigned long trap_nr; /* last trap # on this thread */
#ifdef CONFIG_ALTIVEC
/* Complete AltiVec register set */
vector128 vr[32] __attribute__((aligned(16)));

2
arch/powerpc/kernel/process.c
View File

@ -258,6 +258,7 @@ void do_send_trap(struct pt_regs *regs, unsigned long address,
{
siginfo_t info;
current->thread.trap_nr = signal_code;
if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
11, SIGSEGV) == NOTIFY_STOP)
return;
@ -275,6 +276,7 @@ void do_dabr(struct pt_regs *regs, unsigned long address,
{
siginfo_t info;
current->thread.trap_nr = TRAP_HWBKPT;
if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
11, SIGSEGV) == NOTIFY_STOP)
return;

1
arch/powerpc/kernel/traps.c
View File

@ -251,6 +251,7 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
if (arch_irqs_disabled() && !arch_irq_disabled_regs(regs))
local_irq_enable();
current->thread.trap_nr = code;
memset(&info, 0, sizeof(info));
info.si_signo = signr;
info.si_code = code;

1
arch/powerpc/mm/fault.c
View File

@ -133,6 +133,7 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address)
up_read(&current->mm->mmap_sem);
if (user_mode(regs)) {
current->thread.trap_nr = BUS_ADRERR;
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;