tree 78bd55aae0bcfba26dbedeb93471e13635f90c67
parent 7797d17c591ae62c6f43c6de4fdb8beeb50eb692
author Will Deacon <will.deacon@arm.com> 1350569820 +0100
committer Catalin Marinas <catalin.marinas@arm.com> 1350587734 +0100

arm64: ptrace: use HW_BREAKPOINT_EMPTY type for disabled breakpoints

If a debugger tries to zero a hardware debug control register, the
kernel will try to infer both the type and length of the breakpoint
in order to sanity-check against the requested regset type. This will
fail because the encoding will appear as a zero-length breakpoint.

This patch changes the control register setting so that disabled
breakpoints are treated as HW_BREAKPOINT_EMPTY and no further
sanity-checking is required.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>