riscv-semihosting

Simple semihosting for RISC-V processors

This is a fork of the cortex-m-semihosting crate with changes to support the RISC-V Semihosting Specification as documented here

This crate can (almost) be used in exactly the same way as cortex-m-semihosting, simply by changing calls to cortex_m_semihosting::* to riscv_semihosting::*. Given this, the cortex-m-semihosting documentation is generally sufficient for using this library.

A major difference between this library and cortex-m-semihosting is that there are mandatory features to choose the privilege level at which the semihosting calls are executed. The machine-mode (M-mode) feature will cause the macros in export to execute the semihosting operation in an interrupt-free context, while user-mode (U-mode) causes them to just execute the operation. By default, M-mode is used. You can activate the U-mode via the u-mode feature.

About the semihosting crate

riscv-semihosting provides a simple semihosting API that matches cortex-m-semihosting. This allows a simple port from Cortex-M applications to RISC-V applications. However, the semihosting crate presents a more advanced interface that is compatible for RISC-V as well as other architectures (e.g., ARM or MIPS). While riscv-semihosting is a good starting point for developing semihosted applications, we recommend using the semihosting crate.

Minimum Supported Rust Version (MSRV)

This crate is guaranteed to compile on stable Rust 1.60.0 and up. It won't compile with older versions.

License

Copyright 2018-2023 RISC-V team

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Code of Conduct

Contribution to this crate is organized under the terms of the Rust Code of Conduct, the maintainer of this crate, the RISC-V team, promises to intervene to uphold that code of conduct.