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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 /arch/x86/kernel/kgdb.c | |
| parent | kdb,kgdb: fix sparse fixups (diff) | |
| download | linux-dev-c1bb9a9c1911036549c5cdfb23f32d7d20ffdc5a.tar.xz linux-dev-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 'arch/x86/kernel/kgdb.c')
0 files changed, 0 insertions, 0 deletions