tree 4ea796f79b4bfc9b090eb6c15ed85763203fb2e2
parent 3849902cd852d7de0783abc41cb0c57949d567fd
author Peter Maydell <peter.maydell@linaro.org> 1298398783 +0000
committer Aurelien Jarno <aurelien@aurel32.net> 1299487579 +0100

target-arm: Implement a minimal set of cp14 debug registers

Newer ARM kernels try to probe for whether the CPU has hardware breakpoint
support. For this to work QEMU has to implement a minimal set of the cp14
debug registers. The architecture requires v7 cores to implement debug
and so there is no defined way to report its absence; however in practice
returning a zero DBGDIDR (ie with a reserved value for "debug architecture
version") should cause well-written hw debug users to do the right thing.
We also implement DBGDRAR and DBGDSAR as RAZ, indicating no memory mapped
debug components.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>