Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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raiden00pl 7815a905af arch/x86_64: align the user signal frame and skip the ABI red zone
The signal frame was built inside the 128 byte red zone of the
interrupted user code and inherited its stack alignment, so a leaf
function could lose live data to the siginfo copy and the handler
could fault on an SSE access. Build the frame below the red zone,
16 byte aligned; the naked trampoline calls the handler itself and
its call provides the return address slot.

Signed-off-by: raiden00pl <raiden00@railab.me>
Assisted-by: Claude Code
2026-08-12 19:48:27 +08:00
.github Documentation: PBKDF2 login docs, board Kconfig, and CI password 2026-08-05 15:26:28 +02:00
arch arch/x86_64: align the user signal frame and skip the ABI red zone 2026-08-12 19:48:27 +08:00
audio audio: limit the buffer count guard to shared ring requests 2026-08-05 16:00:32 +08:00
binfmt tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-08-04 00:36:32 +08:00
boards stm32f746g-disco: Add support for Winbond W25Q128JVEQ flash chip 2026-08-07 12:49:07 -03:00
cmake !tools/mkpasswd: PBKDF2 host tool and ROMFS passwd build integration 2026-08-05 15:26:28 +02:00
crypto crypto: add CRYPTO_CHACHA20_DJB variant (64-bit counter/nonce) 2026-08-06 17:48:23 +08:00
Documentation !arch/arm/src/stm32: unify the timer input clock board options 2026-08-07 12:49:07 -03:00
drivers drivers/usbdev/cdcacm: fix self-deadlock in cdcuart_txempty() 2026-08-10 22:42:44 +08:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs fs/vfs: provide link fallback without softlinks 2026-08-07 12:49:07 -03:00
graphics tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-08-04 00:36:32 +08:00
include syscall: add missing memory locking and clock_getres entries 2026-08-10 22:48:05 +08:00
libs drivers/serial: add job-control TTY ioctls and libc wrappers 2026-08-06 17:48:04 +08:00
mm mm/ubsan: fix signed inline value decoding 2026-08-04 09:34:08 +08:00
net net/igmp: fix length check that always dropped valid IGMP packets 2026-08-06 19:39:26 +08:00
openamp tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-08-04 00:36:32 +08:00
pass1 tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-08-04 00:36:32 +08:00
sched sched/sched: Fix uninitialized sporadic params returned by nxsched_get_param() 2026-08-04 09:34:23 +08:00
syscall syscall: add missing memory locking and clock_getres entries 2026-08-10 22:48:05 +08:00
tools !tools/mkpasswd: PBKDF2 host tool and ROMFS passwd build integration 2026-08-05 15:26:28 +02:00
video tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-08-04 00:36:32 +08:00
wireless tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-08-04 00:36:32 +08:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines !boards: Remove NSH_ARCHINIT and board_app_initialize 2026-05-02 18:36:46 +08:00
.codespellrc arch/sim: replace macOS C++ constructor runtime hack with post-link patch 2026-05-19 07:08:55 -03:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore git: Specify multiple build directories in .gitignore. 2026-05-20 03:06:58 +08:00
.gitmessage docs/contributing: Add a commit message template 2025-06-03 17:33:24 +08:00
.pre-commit-config.yaml pre-commit: enable codespell checks 2025-05-05 12:34:39 +08:00
.yamllint
AUTHORS AUTHORS: add Eren Terzioglu 2026-05-20 15:17:00 +08:00
CMakeLists.txt cmake: Do not link an executable to detect the compiler. 2026-08-03 22:21:10 +08:00
CONTRIBUTING.md docs: Fix typos, formatting, and numbering in README.md and CONTRIBUTING.md. 2026-03-23 12:05:24 +01:00
INVIOLABLES.md
Kconfig sched/misc/assert: Add CONFIG_SCHED_DUMP_TASKS and CONFIG_SCHED_DUMP_STACK 2026-07-04 13:29:32 -04:00
LICENSE !arch/stm32: move stm32l1 and finalize the directory split 2026-07-03 10:27:27 +08:00
Makefile !boards: enforce secure ROMFS passwd and TEA key setup 2026-08-05 15:26:28 +02:00
NOTICE
README.md docs: Fix typos, formatting, and numbering in README.md and CONTRIBUTING.md. 2026-03-23 12:05:24 +01:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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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.