Module gdbstub::arch

Built-in implementations of Arch for various architectures.

Note: If an architecture is missing from this module, that does not mean that it can't be used with gdbstub! So-long as there's support for the target architecture in GDB, it should be fairly straightforward to implement Arch manually.

Please consider upstreaming any missing Arch implementations you happen to implement yourself! Aside from the altruistic motive of improving gdbstub, upstreaming your Arch implementation will ensure that it's kept up-to-date with any future breaking API changes.

Disclaimer: These implementations are all community contributions, and while they are tested (by the PR's author) and code-reviewed, it's not particularly feasible to write detailed tests for each architecture! If you spot a bug in any of the implementations, please file an issue / open a PR!

What's with RegIdImpl?

Supporting the Target::read/write_register API required introducing a new RegId trait + Arch::RegId associated type. RegId is used by gdbstub to translate raw GDB register ids (a protocol level arch-dependent usize) into human-readable enum variants.

Unfortunately, this API was added after several contributors had already upstreamed their Arch implementations, and as a result, there are several built-in arch implementations which are missing proper RegId enums (tracked under issue #29).

As a stop-gap measure, affected Arch implementations have been modified to accept a RegIdImpl type parameter, which requires users to manually specify a RegId implementation.

If you're not interested in implementing the Target::read/write_register methods and just want to get up-and-running with gdbstub, it's fine to set RegIdImpl to () and use the built-in stubbed impl RegId for ().

A better approach would be to implement (and hopefully upstream!) a proper RegId enum. While this will require doing a bit of digging through the GDB docs + architecture XML definitions, it's not too tricky to get a working implementation up and running, and makes it possible to safely and efficiently implement the Target::read/write_register API. As an example, check out ArmCoreRegId.

Whenever a RegId enum is upstreamed, the associated Arch's RegIdImpl parameter will be defaulted to the newly added enum. This will simplify the API without requiring an explicit breaking API change. Once all RegIdImpl have a default implementation, only a single breaking API change will be required to remove RegIdImpl entirely (along with this documentation).

Modules

arm	Implementations for various ARM architectures.
mips	Implementations for the MIPS architecture.
msp430	Implementations for the TI-MSP430 family of MCUs.
ppc	Implementations for various PowerPC architectures.
riscv	Implementations for the RISC-V architecture.
x86	Implementations for various x86 architectures.

Traits

Arch	Encodes architecture-specific information, such as pointer size, register layout, etc...
RegId	Register identifier for target registers.
Registers	Methods to read/write architecture-specific registers.