powerpc/perf: Fix setting of "to" addresses for BHRB

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Currently we only set the "to" address in the branch stack when the CPU
explicitly gives us a value.  Unfortunately it only does this for XL form
branches (eg blr, bctr, bctar) and not I and B form branches (eg b, bc).

Fortunately if we read the instruction from memory we can extract the offset of
a branch and calculate the target address.

This adds a function power_pmu_bhrb_to() to calculate the target/to address of
the corresponding I and B form branches.  It handles branches in both user and
kernel spaces.  It also plumbs this into the perf brhb reading code.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Michael Neuling 2013-05-13 18:44:58 +00:00 • committed by Benjamin Herrenschmidt

parent 506e70d132

commit 691231846c

1 changed files with 30 additions and 1 deletions

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arch/powerpc/perf/core-book3s.c

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