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Add a new ABI to support cmse_nonsecure_call

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This commit adds a new ABI to be selected via `extern
"C-cmse-nonsecure-call"` on function pointers in order for the compiler to
apply the corresponding cmse_nonsecure_call callsite attribute.
For Armv8-M targets supporting TrustZone-M, this will perform a
non-secure function call by saving, clearing and calling a non-secure
function pointer using the BLXNS instruction.

See the page on the unstable book for details.

Signed-off-by: Hugues de Valon <hugues.devalon@arm.com>
This commit is contained in:
Hugues de Valon 2021-01-24 17:15:05 +00:00
parent d60b29d1ae
commit ce9818f2b7
35 changed files with 251 additions and 3 deletions
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3
compiler/rustc_feature/src/active.rs
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@ -628,6 +628,9 @@ declare_features! (
/// Allows using `pointer` and `reference` in intra-doc links
(active, intra_doc_pointers, "1.51.0", Some(80896), None),
/// Allows `extern "C-cmse-nonsecure-call" fn()`.
(active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------