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Message-Id: <1267132893-23624-20-git-send-email-jason.wessel@windriver.com>
Date: Thu, 25 Feb 2010 15:21:24 -0600
From: Jason Wessel <jason.wessel@...driver.com>
To: torvalds@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 19/28] mips,kgdb: kdb low level trap catch and stack trace
The only way the debugger can handle a trap in inside rcu_lock,
notify_die, or atomic_notifier_call_chain without a recursive fault is
to have a low level "first opportunity handler" do_trap_or_bp() handler.
Generally this will be something the vast majority of folks will not
need, but for those who need it, it is added as a kernel .config
option called KGDB_LOW_LEVEL_TRAP.
Also added was a die notification for oops such that kdb can catch an
oops for analysis.
There appeared to be no obvious way to pass the struct pt_regs from
the original exception back to the stack back tracer, so a special
case was added to show_stack() for when kdb is active because you
generally desire to generally look at the back trace of the original
exception.
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Acked-by: Ralf Baechle <ralf@...ux-mips.org>
---
arch/mips/include/asm/kgdb.h | 2 ++
arch/mips/kernel/kgdb.c | 22 +++++++++++++++++++++-
arch/mips/kernel/traps.c | 13 +++++++++++++
lib/Kconfig.kgdb | 2 +-
4 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/arch/mips/include/asm/kgdb.h b/arch/mips/include/asm/kgdb.h
index 48223b0..19002d6 100644
--- a/arch/mips/include/asm/kgdb.h
+++ b/arch/mips/include/asm/kgdb.h
@@ -38,6 +38,8 @@ extern int kgdb_early_setup;
extern void *saved_vectors[32];
extern void handle_exception(struct pt_regs *regs);
extern void breakinst(void);
+extern int kgdb_ll_trap(int cmd, const char *str,
+ struct pt_regs *regs, long err, int trap, int sig);
#endif /* __KERNEL__ */
diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
index 6ed4c83..9b78ff6 100644
--- a/arch/mips/kernel/kgdb.c
+++ b/arch/mips/kernel/kgdb.c
@@ -203,7 +203,7 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
if (atomic_read(&kgdb_active) != -1)
kgdb_nmicallback(smp_processor_id(), regs);
- if (kgdb_handle_exception(trap, compute_signal(trap), 0, regs))
+ if (kgdb_handle_exception(trap, compute_signal(trap), cmd, regs))
return NOTIFY_DONE;
if (atomic_read(&kgdb_setting_breakpoint))
@@ -217,6 +217,26 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
return NOTIFY_STOP;
}
+#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
+int kgdb_ll_trap(int cmd, const char *str,
+ struct pt_regs *regs, long err, int trap, int sig)
+{
+ struct die_args args = {
+ .regs = regs,
+ .str = str,
+ .err = err,
+ .trapnr = trap,
+ .signr = sig,
+
+ };
+
+ if (!kgdb_io_module_registered)
+ return NOTIFY_DONE;
+
+ return kgdb_mips_notify(NULL, cmd, &args);
+}
+#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
+
static struct notifier_block kgdb_notifier = {
.notifier_call = kgdb_mips_notify,
};
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 31b204b..241b0d1 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -26,6 +26,7 @@
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/notifier.h>
+#include <linux/kdb.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -184,6 +185,11 @@ void show_stack(struct task_struct *task, unsigned long *sp)
regs.regs[29] = task->thread.reg29;
regs.regs[31] = 0;
regs.cp0_epc = task->thread.reg31;
+#ifdef CONFIG_KGDB_KDB
+ } else if (atomic_read(&kgdb_active) != -1 &&
+ kdb_current_regs) {
+ memcpy(®s, kdb_current_regs, sizeof(regs));
+#endif /* CONFIG_KGDB_KDB */
} else {
prepare_frametrace(®s);
}
@@ -358,6 +364,8 @@ void __noreturn die(const char * str, const struct pt_regs * regs)
unsigned long dvpret = dvpe();
#endif /* CONFIG_MIPS_MT_SMTC */
+ notify_die(DIE_OOPS, str, (struct pt_regs *)regs, SIGSEGV, 0, 0);
+
console_verbose();
spin_lock_irq(&die_lock);
bust_spinlocks(1);
@@ -698,6 +706,11 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
siginfo_t info;
char b[40];
+#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
+ if (kgdb_ll_trap(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
+ return;
+#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
+
if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
return;
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 0a0e049..8711264 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -59,7 +59,7 @@ config KGDB_TESTS_BOOT_STRING
config KGDB_LOW_LEVEL_TRAP
bool "KGDB: Allow debugging with traps in notifiers"
- depends on X86
+ depends on X86 || MIPS
default n
help
This will add an extra call back to kgdb for the breakpoint
--
1.6.4.rc1
--
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