[Blackfin] arch: fix bug - when using trace buffer with CONFIG_MPU enabled.

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There were a couple of problems with the way the trace buffer state
is saved/restored in assembly.  The DEBUG_HWTRACE_SAVE/RESTORE macros
save a value to the stack, which is not immediately obvious; the CPLB
exception code needed changes to load the correct value of the stack
pointer.  The other problem is that the SAVE/RESTORE macros weren't
pushing and popping the value downwards on the stack, but rather moving
it _upwards_, which is of course completely broken.

We also need to make sure there's a matching DEBUG_HWTRACE_RESTORE in
the error case of the CPLB handler.

Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

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Bernd Schmidt 2008-04-23 07:17:34 +08:00 • committed by Bryan Wu

parent dbfe44f02b

commit 2a0c4fdb66

2 changed files with 8 additions and 3 deletions

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include/asm-blackfin/trace.h

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