Split aarch64 pauth feature into paca and pacg

Author: adamgemmell

crates/std_detect/src/detect/arch/aarch64.rs

@@ -31,7 +31,8 @@ features! {
     /// * `"flagm"` - FEAT_FLAGM
     /// * `"ssbs"` - FEAT_SSBS
     /// * `"sb"` - FEAT_SB
-    /// * `"pauth"` - FEAT_PAuth
+    /// * `"paca"` - FEAT_PAuth (address authentication)
+    /// * `"pacg"` - FEAT_Pauth (generic authentication)
     /// * `"dpb"` - FEAT_DPB
     /// * `"dpb2"` - FEAT_DPB2
     /// * `"sve2"` - FEAT_SVE2
@@ -101,8 +102,10 @@ features! {
     /// FEAT_SSBS (speculative store bypass safe)
     @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] sb: "sb";
     /// FEAT_SB (speculation barrier)
-    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] pauth: "pauth";
-    /// FEAT_PAuth (pointer authentication)
+    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] paca: "paca";
+    /// FEAT_PAuth (address authentication)
+    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] pacg: "pacg";
+    /// FEAT_PAuth (generic authentication)
     @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] dpb: "dpb";
     /// FEAT_DPB (aka dcpop - data cache clean to point of persistance)
     @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] dpb2: "dpb2";

crates/std_detect/src/detect/os/aarch64.rs

@@ -87,7 +87,11 @@ pub(crate) fn detect_features() -> cache::Initializer {
             );
         }
 
+        // Check for either APA or API field
+        enable_feature(Feature::paca, bits_shift(aa64isar1, 11, 4) >= 1);
         enable_feature(Feature::rcpc, bits_shift(aa64isar1, 23, 20) >= 1);
+        // Check for either GPA or GPI field
+        enable_feature(Feature::pacg, bits_shift(aa64isar1, 31, 24) >= 1);
     }
 
     value

crates/std_detect/src/detect/os/linux/aarch64.rs

@@ -230,8 +230,8 @@ impl AtHwcap {
             enable_feature(Feature::flagm, self.flagm);
             enable_feature(Feature::ssbs, self.ssbs);
             enable_feature(Feature::sb, self.sb);
-            // FEAT_PAuth provides both paca & pacg
-            enable_feature(Feature::pauth, self.paca && self.pacg);
+            enable_feature(Feature::paca, self.paca);
+            enable_feature(Feature::pacg, self.pacg);
             enable_feature(Feature::dpb, self.dcpop);
             enable_feature(Feature::dpb2, self.dcpodp);
             enable_feature(Feature::rand, self.rng);

crates/std_detect/tests/cpu-detection.rs

@@ -55,7 +55,8 @@ fn aarch64_linux() {
     println!("flagm: {}", is_aarch64_feature_detected!("flagm"));
     println!("ssbs: {}", is_aarch64_feature_detected!("ssbs"));
     println!("sb: {}", is_aarch64_feature_detected!("sb"));
-    println!("pauth: {}", is_aarch64_feature_detected!("pauth"));
+    println!("paca: {}", is_aarch64_feature_detected!("paca"));
+    println!("pacg: {}", is_aarch64_feature_detected!("pacg"));
     println!("dpb: {}", is_aarch64_feature_detected!("dpb"));
     println!("dpb2: {}", is_aarch64_feature_detected!("dpb2"));
     println!("sve2: {}", is_aarch64_feature_detected!("sve2"));