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If we watchdog while in exception context, our process PC is not very useful. Log the actual watchdog PC as our SW panic param, stored in R5. BUG=chrome-os-partner:60470 BRANCH=gru TEST=Add "while(1);" in ISR, wait for watchdog, check with 'panicinfo' that saved R5 is our watchdog PC. Change-Id: Idbdf1bc3507cc88e7a944c7bbe24ed87a6720eea Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/417061 Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> (cherry picked from commit 2404a5e7bff4bed278b22260513132a985fa4004) Reviewed-on: https://chromium-review.googlesource.com/417113 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>