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When an SError arrives during single-step both the SError and debug exceptions may be pending when the step is completed, and the architecture doesn't define the ordering of the two. This means that we can observe en SError even though we've just completed a step, without receiving a debug exception. In that case the DBG_SPSR_SS bit will have flipped as the instruction executed. After handling the abort in handle_exit() we test to see if the bit is clear and we were single-stepping before deciding if we need to exit to user space. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.