ci: add CI for Linux/aarch64/musl and fix its build (#2510)

* ci: add CI for Linux/aarch64/musl

* fix: enable RegisterSet and RegisterSetValue for aarch64/musl

* fix: cfg

* fix: cfg

* style: make clippy happy

Author: SteveLauC

.cirrus.yml

@@ -68,12 +68,18 @@ task:
 # Tasks for Linux aarch64 native builds 
 task:
   matrix:
-    - name: Linux aarch64
+    - name: Linux aarch64 gnu
       arm_container:
         image: rust:1.69.0
         cpu: 1
       env:
         TARGET: aarch64-unknown-linux-gnu
+    - name: Linux aarch64 musl
+      arm_container:
+        image: rust:1.69.0
+        cpu: 1
+      env:
+        TARGET: aarch64-unknown-linux-musl
   setup_script:
     - rustup target add $TARGET
     - rustup component add clippy

src/sys/ptrace/linux.rs

@@ -173,13 +173,21 @@ libc_enum! {
 
 #[cfg(all(
     target_os = "linux",
-    target_env = "gnu",
     any(
-        target_arch = "x86_64",
-        target_arch = "x86",
-        target_arch = "aarch64",
-        target_arch = "riscv64",
-    )
+        all(
+            target_env = "gnu",
+            any(
+                target_arch = "x86_64",
+                target_arch = "x86",
+                target_arch = "aarch64",
+                target_arch = "riscv64",
+            )
+        ),
+        all(
+            target_env = "musl",
+            target_arch = "aarch64",
+        )
+    ),
 ))]
 libc_enum! {
     #[repr(i32)]
@@ -196,13 +204,21 @@ libc_enum! {
 
 #[cfg(all(
     target_os = "linux",
-    target_env = "gnu",
     any(
-        target_arch = "x86_64",
-        target_arch = "x86",
-        target_arch = "aarch64",
-        target_arch = "riscv64",
-    )
+        all(
+            target_env = "gnu",
+            any(
+                target_arch = "x86_64",
+                target_arch = "x86",
+                target_arch = "aarch64",
+                target_arch = "riscv64",
+            )
+        ),
+        all(
+            target_env = "musl",
+            target_arch = "aarch64",
+        )
+    ),
 ))]
 /// Represents register set areas, such as general-purpose registers or
 /// floating-point registers.
@@ -219,15 +235,24 @@ pub unsafe trait RegisterSet {
     type Regs;
 }
 
+
 #[cfg(all(
     target_os = "linux",
-    target_env = "gnu",
     any(
-        target_arch = "x86_64",
-        target_arch = "x86",
-        target_arch = "aarch64",
-        target_arch = "riscv64",
-    )
+        all(
+            target_env = "gnu",
+            any(
+                target_arch = "x86_64",
+                target_arch = "x86",
+                target_arch = "aarch64",
+                target_arch = "riscv64",
+            )
+        ),
+        all(
+            target_env = "musl",
+            target_arch = "aarch64",
+        )
+    ),
 ))]
 /// Register sets used in [`getregset`] and [`setregset`]
 pub mod regset {

test/sys/test_ptrace.rs

@@ -179,12 +179,17 @@ fn test_ptrace_interrupt() {
 // ptrace::{setoptions, getregs} are only available in these platforms
 #[cfg(all(
     target_os = "linux",
-    target_env = "gnu",
     any(
-        target_arch = "x86_64",
-        target_arch = "x86",
-        target_arch = "aarch64",
-        target_arch = "riscv64",
+        all(
+            target_env = "gnu",
+            any(
+                target_arch = "x86_64",
+                target_arch = "x86",
+                target_arch = "aarch64",
+                target_arch = "riscv64"
+            )
+        ),
+        all(target_env = "musl", target_arch = "aarch64")
     )
 ))]
 #[test]