c8a883a412
aee5404e02Add support for RNDR/RNDRRS for aarch64 on Linux (John Moffett) Pull request description: This checks whether the ARMv8.5-A optional TRNG extensions [RNDR](https://developer.arm.com/documentation/ddi0601/2022-12/AArch64-Registers/RNDR--Random-Number) and [RNDRRS](https://developer.arm.com/documentation/ddi0601/2022-12/AArch64-Registers/RNDRRS--Reseeded-Random-Number) are available and, if they are, uses them for random entropy purposes. They are nearly functionally identical to the x86 RDRAND/RDSEED extensions and are used in a similar manner. Currently, there [appears to be](https://marcin.juszkiewicz.com.pl/download/tables/arm-socs.html) only one actual hardware implementation -- the Amazon Graviton 3. (See the `rnd` column in the link.) However, future hardware implementations may become available. It's not possible to directly query for the capability in userspace, but the Linux kernel [added support](1a50ec0b3b) for querying the extension via `getauxval` in version 5.6 (in 2020), so this is limited to Linux-only for now. Reviewers may want to launch any of the `c7g` instances from AWS to test the Graviton 3 hardware. Alternatively, QEMU emulates these opcodes for `aarch64` with CPU setting `max`. Output from Graviton 3 hardware: ``` ubuntu@ip:~/bitcoin$ src/bitcoind -regtest 2023-01-06T20:01:48Z Bitcoin Core version v24.99.0-3670266ce89a (release build) 2023-01-06T20:01:48Z Using the 'arm_shani(1way,2way)' SHA256 implementation 2023-01-06T20:01:48Z Using RNDR and RNDRRS as additional entropy sources 2023-01-06T20:01:48Z Default data directory /home/ubuntu/.bitcoin ``` Graviton 2 (doesn't support extensions): ``` ubuntu@ip:~/bitcoin$ src/bitcoind -regtest 2023-01-06T20:05:04Z Bitcoin Core version v24.99.0-3670266ce89a (release build) 2023-01-06T20:05:04Z Using the 'arm_shani(1way,2way)' SHA256 implementation 2023-01-06T20:05:04Z Default data directory /home/ubuntu/.bitcoin ``` This partially closes #26796. As noted in that issue, OpenSSL [added support](https://github.com/openssl/openssl/pull/15361) for these extensions a little over a year ago. ACKs for top commit: achow101: ACKaee5404e02laanwj: Tested ACKaee5404e02Tree-SHA512: 1c1eb345d6690f5307a87e9bac8f06a0d1fdc7ca35db38fa22192510a44289a03252e4677dc7cbf731a27e6e3a9a4e42b6eb4149fe063bc1c905eb2536cdb1d3
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
What is Bitcoin Core?
Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.
Further information about Bitcoin Core is available in the doc folder.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.
Development Process
The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be
completely stable. Tags are created
regularly from release branches to indicate new official, stable release versions of Bitcoin Core.
The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled in configure) with: make check. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python.
These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py
The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.