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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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1
compiler/rustc_error_codes/src/error_codes.rs
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@ -465,6 +465,7 @@ E0777: include_str!("./error_codes/E0777.md"),
E0778: include_str!("./error_codes/E0778.md"),
E0779: include_str!("./error_codes/E0779.md"),
E0780: include_str!("./error_codes/E0780.md"),
E0781: include_str!("./error_codes/E0781.md"),
;
// E0006, // merged with E0005
// E0008, // cannot bind by-move into a pattern guard

12
compiler/rustc_error_codes/src/error_codes/E0781.md Normal file
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@ -0,0 +1,12 @@
The `C-cmse-nonsecure-call` ABI can only be used with function pointers.
Erroneous code example:
```compile_fail,E0781
#![feature(abi_c_cmse_nonsecure_call)]
pub extern "C-cmse-nonsecure-call" fn test() {}
```
The `C-cmse-nonsecure-call` ABI should be used by casting function pointers to
specific addresses.