4b420f6e71
The x86_64 ABI requires the stack pointer to be 16-byte aligned before the call of a function and decreased by 8 at the function entrypoint (after the return address has been pushed to the stack). Currently, when a new Genode thread gets created, the initial stack pointer is aligned to 16 byte. On Genode/Linux, the thread entry function is entered by a 'call' instruction, so the stack pointer alignment at the function entrypoint is correct. On Fiasco.OC and NOVA, however, the thread entry function gets executed without a return address being pushed to the stack, so at the function entrypoint the stack pointer is still aligned to 16 byte, which can cause problems with compiler-generated SSE instructions. With this patch, the stack pointer given to a new thread gets aligned to 16 bytes and decreased by 8 by default, since most of the currently supported base platforms execute the thread entry function without pushing a return address to the stack. For base-linux, the stack pointer gets realigned to 16 bytes before the thread entry function gets called. Fixes #1043. |
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| README | ||
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together.