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| author | Dongdong Deng <dongdong.deng@windriver.com> | 2010-09-13 06:58:00 -0500 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-10-22 15:34:12 -0500 |
| commit | c1bb9a9c1911036549c5cdfb23f32d7d20ffdc5a (patch) | |
| tree | 8d86976df36697e54ae3582d6c30b7355a942647 /kernel | |
| parent | 91b152aa85bbcf076e269565394c31964f940371 (diff) | |
| download | linux-stable-c1bb9a9c1911036549c5cdfb23f32d7d20ffdc5a.tar.gz linux-stable-c1bb9a9c1911036549c5cdfb23f32d7d20ffdc5a.tar.bz2 linux-stable-c1bb9a9c1911036549c5cdfb23f32d7d20ffdc5a.zip | |
debug_core: disable hw_breakpoints on all cores in kgdb_cpu_enter()
The slave cpus do not have the hw breakpoints disabled upon entry to
the debug_core and as a result could cause unrecoverable recursive
faults on badly placed breakpoints, or get out of sync with the arch
specific hw breakpoint operations.
This patch addresses the problem by invoking kgdb_disable_hw_debug()
earlier in kgdb_enter_cpu for each cpu that enters the debug core.
The hw breakpoint dis/enable flow should be:
master_debug_cpu slave_debug_cpu
\ /
kgdb_cpu_enter
|
kgdb_disable_hw_debug --> uninstall pre-enabled hw_breakpoint
|
do add/rm dis/enable operates to hw_breakpoints on master_debug_cpu..
|
correct_hw_break --> correct/install the enabled hw_breakpoint
|
leave_kgdb
Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/debug/debug_core.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 5a3b04d20497..bb9497724808 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -485,6 +485,9 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs) int error; int i, cpu; int trace_on = 0; + + kgdb_disable_hw_debug(ks->linux_regs); + acquirelock: /* * Interrupts will be restored by the 'trap return' code, except when @@ -569,8 +572,6 @@ return_normal: if (dbg_io_ops->pre_exception) dbg_io_ops->pre_exception(); - kgdb_disable_hw_debug(ks->linux_regs); - /* * Get the passive CPU lock which will hold all the non-primary * CPU in a spin state while the debugger is active @@ -661,6 +662,8 @@ kgdb_restore: else kgdb_sstep_pid = 0; } + if (arch_kgdb_ops.correct_hw_break) + arch_kgdb_ops.correct_hw_break(); if (trace_on) tracing_on(); /* Free kgdb_active */ |