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| author | Jason Wessel <jason.wessel@windriver.com> | 2008-03-07 16:34:16 -0600 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 20:05:40 +0200 |
| commit | 737a460f21febe551ff1d2299b63bae9b154078f (patch) | |
| tree | 7a2d9440222c22446e283f6fbc959b4a44270989 /arch | |
| parent | 84b5ae15216aa3ea0314f395536ef9829af21e14 (diff) | |
| download | linux-737a460f21febe551ff1d2299b63bae9b154078f.tar.gz linux-737a460f21febe551ff1d2299b63bae9b154078f.tar.bz2 linux-737a460f21febe551ff1d2299b63bae9b154078f.zip | |
kgdb: fix several kgdb regressions
kgdb core fixes:
- Check to see that mm->mmap_cache is not null before calling
flush_cache_range(), else on arch=ARM it will cause a fatal
fault.
- Breakpoints should only be restored if they are in the BP_ACTIVE
state.
- Fix a typo in comments to "kgdb_register_io_module"
x86 kgdb fixes:
- Fix the x86 arch handler such that on a kill or detach that the
appropriate cleanup on the single stepping flags gets run.
- Add in the DIE_NMIWATCHDOG call for x86_64
- Touch the nmi watchdog before returning the system to normal
operation after performing any kind of kgdb operation, else
the possibility exists to trigger the watchdog.
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/kgdb.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/traps_64.c | 7 |
2 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c index 7d651adcb222..8c7e555f6d39 100644 --- a/arch/x86/kernel/kgdb.c +++ b/arch/x86/kernel/kgdb.c @@ -370,6 +370,8 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, ptr = &remcomInBuffer[1]; if (kgdb_hex2long(&ptr, &addr)) linux_regs->ip = addr; + case 'D': + case 'k': newPC = linux_regs->ip; /* clear the trace bit */ @@ -480,6 +482,8 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd) if (kgdb_handle_exception(args->trapnr, args->signr, args->err, regs)) return NOTIFY_DONE; + /* Must touch watchdog before return to normal operation */ + touch_nmi_watchdog(); return NOTIFY_STOP; } diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index 055b1650c69d..4e073320e70a 100644 --- a/arch/x86/kernel/traps_64.c +++ b/arch/x86/kernel/traps_64.c @@ -600,8 +600,13 @@ void die(const char * str, struct pt_regs * regs, long err) void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) { - unsigned long flags = oops_begin(); + unsigned long flags; + + if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == + NOTIFY_STOP) + return; + flags = oops_begin(); /* * We are in trouble anyway, lets at least try * to get a message out. |