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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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8
compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
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@ -216,6 +216,14 @@ extern "C" void LLVMRustAddCallSiteAttribute(LLVMValueRef Instr, unsigned Index,
Call->addAttribute(Index, Attr);
}
extern "C" void LLVMRustAddCallSiteAttrString(LLVMValueRef Instr, unsigned Index,
const char *Name) {
CallBase *Call = unwrap<CallBase>(Instr);
Attribute Attr = Attribute::get(Call->getContext(), Name);
Call->addAttribute(Index, Attr);
}
extern "C" void LLVMRustAddAlignmentCallSiteAttr(LLVMValueRef Instr,
unsigned Index,
uint32_t Bytes) {