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b0e626b380
Implement switching of the debug registers. While the number of registers is massive, CPUs usually don't implement them all (A57 has 6 breakpoints and 4 watchpoints, which gives us a total of 22 registers "only"). Also, we only save/restore them when MDSCR_EL1 has debug enabled, or when we've flagged the debug registers as dirty. It means that most of the time, we only save/restore MDSCR_EL1. Reviewed-by: Anup Patel <anup.patel@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>