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Subject[PATCH 2/3] powerpc: Add trap_nr to thread_struct
From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>

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>
---
arch/powerpc/include/asm/processor.h | 1 +
arch/powerpc/kernel/process.c | 2 ++
arch/powerpc/kernel/traps.c | 1 +
arch/powerpc/mm/fault.c | 1 +
4 files changed, 5 insertions(+)

Index: linux-26jul/arch/powerpc/include/asm/processor.h
===================================================================
--- linux-26jul.orig/arch/powerpc/include/asm/processor.h
+++ linux-26jul/arch/powerpc/include/asm/processor.h
@@ -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)));
Index: linux-26jul/arch/powerpc/kernel/process.c
===================================================================
--- linux-26jul.orig/arch/powerpc/kernel/process.c
+++ linux-26jul/arch/powerpc/kernel/process.c
@@ -258,6 +258,7 @@ void do_send_trap(struct pt_regs *regs,
{
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, unsig
{
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;
Index: linux-26jul/arch/powerpc/kernel/traps.c
===================================================================
--- linux-26jul.orig/arch/powerpc/kernel/traps.c
+++ linux-26jul/arch/powerpc/kernel/traps.c
@@ -251,6 +251,7 @@ void _exception(int signr, struct pt_reg
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;
Index: linux-26jul/arch/powerpc/mm/fault.c
===================================================================
--- linux-26jul.orig/arch/powerpc/mm/fault.c
+++ linux-26jul/arch/powerpc/mm/fault.c
@@ -133,6 +133,7 @@ static int do_sigbus(struct pt_regs *reg
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;


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