d79beefa54
On ARMv7-M/ARMv8-M, the hardware exception return determines the final SP from the physical location of the HW exception frame, ignoring any software modification to REG_R13 in the saved register context. This means signal handlers that adjust SP have their change silently discarded. Fix this by relocating the saved context in arm_sigdeliver before calling arm_fullcontextrestore. If the desired SP (regs[REG_R13]) differs from the implied SP, memmove the entire context frame so that the hardware exception return produces the correct final SP. The fix runs only in the signal return path, adding zero overhead to the normal exception return hot path. Signed-off-by: Andrew Au <cshung@gmail.com> |
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| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
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| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
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| tools | ||
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| AUTHORS | ||
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| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
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| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.