3a48365bab
The generation of the software ISR table and the IRQ vector table (respectively generated by CONFIG_GEN_SW_ISR_TABLE and CONFIG_GEN_IRQ_VECTOR_TABLE) should (in theory) go through three stages: 1. A placeholder table is generated in arch/common/isr_tables.c and placed in an orphaned .gnu.linkonce.{irq_vector_table, sw_isr_table} section 2. The real table is generated by arch/common/gen_isr_tables.py (creating the build/zephyr/isr_tables.c file) 3. The real table is un-orphaned by moving it in a proper section with a proper alignment While all the steps are done automatically for the software ISR table, for the IRQ vector table each architectures must take care of modiying its own linker script to place somewhere the generated IRQ vector table (basically step 3 is missing). This is currently only done for 2 architectures: Cortex-M (ARMv7) and ARC. But when another architecture tries to use the IRQ vector table, the linker complains about that. For example: Linking C executable zephyr/zephyr.elf riscv64-zephyr-elf/bin/ld.bfd: warning: orphan section `.gnu.linkonce.irq_vector_table' from `zephyr/CMakeFiles/zephyr_final.dir/isr_tables.c.obj' being placed in section `.gnu.linkonce.irq_vector_table' In this patch we introduce a new CONFIG_ARCH_IRQ_VECTOR_TABLE_ALIGN to support the architectures requiring a special alignment for the IRQ vector table and we also introduce a way to automatically place the IRQ vector table in place in the same way it is done for the ISR software table. Signed-off-by: Carlo Caione <ccaione@baylibre.com> |
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.. raw:: html <a href="https://www.zephyrproject.org"> <p align="center"> <img src="doc/_static/images/logo-readme.svg"> </p> </a> <a href="https://bestpractices.coreinfrastructure.org/projects/74"><img src="https://bestpractices.coreinfrastructure.org/projects/74/badge"></a> <a href="https://github.com/zephyrproject-rtos/zephyr/actions/workflows/twister.yaml?query=branch%3Amain"> <img src="https://github.com/zephyrproject-rtos/zephyr/actions/workflows/twister.yaml/badge.svg?event=push"></a> The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with security in mind. The Zephyr OS is based on a small-footprint kernel designed for use on resource-constrained systems: from simple embedded environmental sensors and LED wearables to sophisticated smart watches and IoT wireless gateways. The Zephyr kernel supports multiple architectures, including ARM (Cortex-A, Cortex-R, Cortex-M), Intel x86, ARC, Nios II, Tensilica Xtensa, and RISC-V, SPARC, MIPS, and a large number of `supported boards`_. .. below included in doc/introduction/introduction.rst Getting Started *************** Welcome to Zephyr! See the `Introduction to Zephyr`_ for a high-level overview, and the documentation's `Getting Started Guide`_ to start developing. .. start_include_here Community Support ***************** Community support is provided via mailing lists and Discord; see the Resources below for details. .. _project-resources: Resources ********* Here's a quick summary of resources to help you find your way around: * **Help**: `Asking for Help Tips`_ * **Documentation**: http://docs.zephyrproject.org (`Getting Started Guide`_) * **Source Code**: https://github.com/zephyrproject-rtos/zephyr is the main repository; https://elixir.bootlin.com/zephyr/latest/source contains a searchable index * **Releases**: https://github.com/zephyrproject-rtos/zephyr/releases * **Samples and example code**: see `Sample and Demo Code Examples`_ * **Mailing Lists**: users@lists.zephyrproject.org and devel@lists.zephyrproject.org are the main user and developer mailing lists, respectively. You can join the developer's list and search its archives at `Zephyr Development mailing list`_. The other `Zephyr mailing list subgroups`_ have their own archives and sign-up pages. * **Nightly CI Build Status**: https://lists.zephyrproject.org/g/builds The builds@lists.zephyrproject.org mailing list archives the CI nightly build results. * **Chat**: Real-time chat happens in Zephyr's Discord Server. Use this `Discord Invite`_ to register. * **Contributing**: see the `Contribution Guide`_ * **Wiki**: `Zephyr GitHub wiki`_ * **Issues**: https://github.com/zephyrproject-rtos/zephyr/issues * **Security Issues**: Email vulnerabilities@zephyrproject.org to report security issues; also see our `Security`_ documentation. Security issues are tracked separately at https://zephyrprojectsec.atlassian.net. * **Zephyr Project Website**: https://zephyrproject.org .. _Discord Invite: https://chat.zephyrproject.org .. _supported boards: http://docs.zephyrproject.org/latest/boards/index.html .. _Zephyr Documentation: http://docs.zephyrproject.org .. _Introduction to Zephyr: http://docs.zephyrproject.org/latest/introduction/index.html .. _Getting Started Guide: http://docs.zephyrproject.org/latest/develop/getting_started/index.html .. _Contribution Guide: http://docs.zephyrproject.org/latest/contribute/index.html .. _Zephyr GitHub wiki: https://github.com/zephyrproject-rtos/zephyr/wiki .. _Zephyr Development mailing list: https://lists.zephyrproject.org/g/devel .. _Zephyr mailing list subgroups: https://lists.zephyrproject.org/g/main/subgroups .. _Sample and Demo Code Examples: http://docs.zephyrproject.org/latest/samples/index.html .. _Security: http://docs.zephyrproject.org/latest/security/index.html .. _Asking for Help Tips: https://docs.zephyrproject.org/latest/develop/getting_started/index.html#asking-for-help