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

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.

1 files changed, 13 insertions, 1 deletions

diff --git a/tests/run-make/pointer-auth-link-with-c/rmake.rs b/tests/run-make/pointer-auth-link-with-c/rmake.rs
index 960eafa546b..7b6dff10eae 100644
--- a/tests/run-make/pointer-auth-link-with-c/rmake.rs
+++ b/tests/run-make/pointer-auth-link-with-c/rmake.rs
@@ -1,7 +1,7 @@
 // `-Z branch protection` is an unstable compiler feature which adds pointer-authentication
 // code (PAC), a useful hashing measure for verifying that pointers have not been modified.
 // This test checks that compilation and execution is successful when this feature is activated,
-// with some of its possible extra arguments (bti, pac-ret, leaf).
+// with some of its possible extra arguments (bti, pac-ret, pc, leaf, b-key).
 // See https://github.com/rust-lang/rust/pull/88354
 
 //@ only-aarch64
@@ -25,4 +25,16 @@ fn main() {
     llvm_ar().obj_to_ar().output_input("libtest.a", &obj_file).run();
     rustc().arg("-Zbranch-protection=bti,pac-ret,leaf").input("test.rs").run();
     run("test");
+
+    // FIXME: +pc was only recently added to LLVM
+    // cc().arg("-v")
+    //     .arg("-c")
+    //     .out_exe("test")
+    //     .input("test.c")
+    //     .arg("-mbranch-protection=bti+pac-ret+pc+leaf")
+    //     .run();
+    // let obj_file = if is_msvc() { "test.obj" } else { "test" };
+    // llvm_ar().obj_to_ar().output_input("libtest.a", &obj_file).run();
+    // rustc().arg("-Zbranch-protection=bti,pac-ret,pc,leaf").input("test.rs").run();
+    // run("test");
 }