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| author |  Norbert Fabritius <norbert.fabritius@esrlabs.com>
| 2023-01-09 11:02:18 +0100 |
|---|---|---|
| committer |  Adam Greig <adam@adamgreig.com>
| 2023-02-17 18:21:25 +0000 |
| commit | 26cae65548eb2c594427caf4a9638e0fdc4f1ba1 (patch) | |
| tree | 345135843b7baa79e589cf18925ec73547ba97f4 | |
| parent | 4714f43cf88198cdfbe19839e1ff7809033d3b42 (diff) | |
| download | cortex-m-26cae65548eb2c594427caf4a9638e0fdc4f1ba1.tar.gz cortex-m-26cae65548eb2c594427caf4a9638e0fdc4f1ba1.tar.zst cortex-m-26cae65548eb2c594427caf4a9638e0fdc4f1ba1.zip | |
Add documentation, test and changelog entry for `zero-init-ram` feature
| -rw-r--r-- | cortex-m-rt/CHANGELOG.md | 4 | ||||
| -rwxr-xr-x | cortex-m-rt/ci/script.sh | 2 | ||||
| -rw-r--r-- | cortex-m-rt/src/lib.rs | 7 |
3 files changed, 11 insertions, 2 deletions
diff --git a/cortex-m-rt/CHANGELOG.md b/cortex-m-rt/CHANGELOG.md index 65144cf..7f1226a 100644 --- a/cortex-m-rt/CHANGELOG.md +++ b/cortex-m-rt/CHANGELOG.md @@ -7,14 +7,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/). ## [Unreleased] -## [v0.7.3] - - Fixed a potential miscompilation caused by the initial stack pointer not being 8-byte aligned. This issue affected 0.7.1 and 0.7.2; for more details please see [the advisory] ([#467]). - A linker error is generated if the initial stack pointer is not 8-byte aligned ([#464]). - The initial stack pointer is now forced to be 8-byte aligned in the linker script, to defend against it being overridden outside of the cortex-m-rt linker script ([#465]). +- Add `zero-init-ram` feature to initialize RAM with zeros on startup. This can be necessary on + safety-critical hardware to properly initialize memory integrity measures. [the advisory]: https://github.com/rust-embedded/cortex-m/discussions/469 [#464]: https://github.com/rust-embedded/cortex-m/issues/464 diff --git a/cortex-m-rt/ci/script.sh b/cortex-m-rt/ci/script.sh index 2941e48..02ba51f 100755 --- a/cortex-m-rt/ci/script.sh +++ b/cortex-m-rt/ci/script.sh @@ -63,6 +63,8 @@ main() { cargo rustc --target "$TARGET" --example minimal --features "set-sp,${needed_features}" -- $linker cargo rustc --target "$TARGET" --example minimal --features "set-sp,${needed_features}" --release -- $linker + cargo rustc --target "$TARGET" --example minimal --features "zero-init-ram,${needed_features}" -- $linker + cargo rustc --target "$TARGET" --example minimal --features "zero-init-ram,${needed_features}" --release -- $linker cargo rustc --target "$TARGET" --example minimal --features "set-vtor,${needed_features}" -- $linker cargo rustc --target "$TARGET" --example minimal --features "set-vtor,${needed_features}" --release -- $linker done diff --git a/cortex-m-rt/src/lib.rs b/cortex-m-rt/src/lib.rs index b90b124..f9df60a 100644 --- a/cortex-m-rt/src/lib.rs +++ b/cortex-m-rt/src/lib.rs @@ -169,6 +169,13 @@ //! `_stack_start` value from the linker script. This is not usually required, but some debuggers //! do not initialise SP when performing a soft reset, which can lead to stack corruption. //! +//! ## `zero-init-ram` +//! +//! If this feature is enabled, RAM is initialized with zeros during startup from the `_ram_start` +//! value to the `_ram_end` value from the linker script. This is not usually required, but might be +//! necessary to properly initialize checksum-based memory integrity measures on safety-critical +//! hardware. +//! //! ## `set-vtor` //! //! If this feature is enabled, the vector table offset register (VTOR) is initialised in the reset |