From: Will Deacon <will.deacon@arm.com>
Date: Thu, 18 Oct 2012 14:17:00 +0000 (+0100)
Subject: arm64: ptrace: use HW_BREAKPOINT_EMPTY type for disabled breakpoints
X-Git-Tag: v3.7-rc2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f34a1da35aed7b438a2de8ac27723a5472e8399;p=pandora-kernel.git

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>
---

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