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rustc_codegen_llvm: Add a new 'pc' option to branch-protection

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Add a new 'pc' option to -Z branch-protection for aarch64 that
enables the use of PC as a diversifier in PAC branch protection code.

When the pauth-lr target feature is enabled in combination
with -Z branch-protection=pac-ret,pc, the new 9.5-a instructions
(pacibsppc, retaasppc, etc) will be generated.
This commit is contained in:
Kajetan Puchalski 2024-10-16 15:39:58 +01:00
parent 4d296eabe4
commit 10edeea4b4
12 changed files with 97 additions and 17 deletions
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2
compiler/rustc_interface/src/tests.rs
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@ -764,7 +764,7 @@ fn test_unstable_options_tracking_hash() {
branch_protection,
Some(BranchProtection {
bti: true,
pac_ret: Some(PacRet { leaf: true, key: PAuthKey::B })
pac_ret: Some(PacRet { leaf: true, pc: true, key: PAuthKey::B })
})
);
tracked!(codegen_backend, Some("abc".to_string()));