Add pointer authentication intrinsics

Author: arttet

compiler/rustc_codegen_llvm/src/context.rs

@@ -931,6 +931,14 @@ impl<'ll> CodegenCx<'ll, '_> {
         ifn!("llvm.va_end", fn(ptr) -> void);
         ifn!("llvm.va_copy", fn(ptr, ptr) -> void);
 
+        // pointer authentication intrinsics
+        ifn!("llvm.ptrauth.sign.i64", fn(t_i64, t_i32, t_i64) -> t_i64);
+        ifn!("llvm.ptrauth.auth.i64", fn(t_i64, t_i32, t_i64) -> t_i64);
+        ifn!("llvm.ptrauth.strip.i64", fn(t_i64, t_i32) -> t_i64);
+        ifn!("llvm.ptrauth.resign.i64", fn(t_i64, t_i32, t_i64, t_i32, t_i64) -> t_i64);
+        ifn!("llvm.ptrauth.sign_generic.i64", fn(t_i64, t_i64) -> t_i64);
+        ifn!("llvm.ptrauth.blend.i64", fn(t_i64, t_i64) -> t_i64);
+
         if self.sess().instrument_coverage() {
             ifn!("llvm.instrprof.increment", fn(ptr, t_i64, t_i32, t_i32) -> void);
         }

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -295,6 +295,24 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                 }
             }
 
+            sym::ptrauth_sign_key_asia
+            | sym::ptrauth_sign_key_asib
+            | sym::ptrauth_sign_key_asda
+            | sym::ptrauth_sign_key_asdb => {
+                let key = self.const_i32(match name {
+                    sym::ptrauth_sign_key_asia => 0,
+                    sym::ptrauth_sign_key_asib => 1,
+                    sym::ptrauth_sign_key_asda => 2,
+                    sym::ptrauth_sign_key_asdb => 3,
+                    _ => bug!("Unknown PAuth key"),
+                });
+
+                let value = args[0].immediate();
+                let discriminator = args[1].immediate();
+
+                self.call_intrinsic("llvm.ptrauth.sign.i64", &[value, key, discriminator])
+            }
+
             sym::raw_eq => {
                 use abi::Abi::*;
                 let tp_ty = fn_args.type_at(0);

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -440,6 +440,11 @@ pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
             },
 
+            ptrauth_sign_key_asda
+            | ptrauth_sign_key_asdb
+            | ptrauth_sign_key_asia
+            | ptrauth_sign_key_asib => (0, vec![tcx.types.i64, tcx.types.i64], tcx.types.i64),
+
             sym::nontemporal_store => {
                 (1, vec![Ty::new_mut_ptr(tcx, param(0)), param(0)], Ty::new_unit(tcx))
             }

compiler/rustc_span/src/symbol.rs

@@ -1260,6 +1260,10 @@ symbols! {
         ptr_write_bytes,
         ptr_write_unaligned,
         ptr_write_volatile,
+        ptrauth_sign_key_asda,
+        ptrauth_sign_key_asdb,
+        ptrauth_sign_key_asia,
+        ptrauth_sign_key_asib,
         pub_macro_rules,
         pub_restricted,
         public,

tests/codegen/intrinsics/ptrauth.rs

@@ -0,0 +1,6 @@
+// compile-flags: -O -C no-prepopulate-passes
+
+#![crate_type = "lib"]
+#![feature(core_intrinsics)]
+
+// TODO: Add tests