CMSE features should check ABI conformance in rustc, not LLVM #81347
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A-codegen
Area: Code generation
C-bug
Category: This is a bug.
F-abi_c_cmse_nonsecure_call
`#![feature(abi_c_cmse_nonsecure_call)]`
F-cmse_nonsecure_entry
`#![feature(cmse_nonsecure_entry)]`
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
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jonas-schievink
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jonas-schievink
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#[cmse_nonsecure_entry] should check ABI conformance in rustc, not LLVM
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matthiaskrgr
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Jul 19, 2024
…rror-messages, r=oli-obk `C-cmse-nonsecure-call`: improved error messages tracking issue: rust-lang#81391 issue for the error messages (partially implemented by this PR): rust-lang#81347 related, in that it also deals with CMSE: rust-lang#127766 When using the `C-cmse-nonsecure-call` ABI, both the arguments and return value must be passed via registers. Previously, when violating this constraint, an ugly LLVM error would be shown. Now, the rust compiler itself will print a pretty message and link to more information.
rust-timer
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Jul 19, 2024
Rollup merge of rust-lang#127814 - folkertdev:c-cmse-nonsecure-call-error-messages, r=oli-obk `C-cmse-nonsecure-call`: improved error messages tracking issue: rust-lang#81391 issue for the error messages (partially implemented by this PR): rust-lang#81347 related, in that it also deals with CMSE: rust-lang#127766 When using the `C-cmse-nonsecure-call` ABI, both the arguments and return value must be passed via registers. Previously, when violating this constraint, an ugly LLVM error would be shown. Now, the rust compiler itself will print a pretty message and link to more information.
rust-timer
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Oct 15, 2024
Rollup merge of rust-lang#130747 - folkertdev:c-cmse-nonsecure-entry-error-messages, r=compiler-errors improve error messages for `C-cmse-nonsecure-entry` functions fixes rust-lang#81347 tracking issue: rust-lang#75835 brings error messages and testing for `C-cmse-nonsecure-entry` in line with `C-cmse-nonsecure-call`. r? `@compiler-errors`
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Using
#[cmse_nonsecure_entry]on a function limits its capabilities. Namely, only up to 4 32-bit arguments can be accepted, and none of them may be passed on the stack. The same is true for the"C-cmse-nonsecure-call"ABI.Currently, this is checked in LLVM, so the user experience is sub-par, and the check happens very late (during codegen instead of type checking). It should be checked in rustc instead.
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