chore: update readme for riscv64

Author: cinit

README.md

@@ -1,14 +1,16 @@
 # Libcore-Syscall / Libcore-ElfLoader
 
-Libcore-Syscall is a Java library for Android that allows you to make any Linux system calls and/or load any ELF shared objects directly from Java code.
+Libcore-Syscall is a pure Java library for Android that allows you to make any Linux system calls and/or
+load any in-memory ELF shared objects (lib*.so) without a writable path/mount point.
 
 ## Features
 
 - Support Android 5.0 - 15
 - Support any system calls (as long as they are permitted by the seccomp filter)
-- Support loading any ELF shared objects (lib*.so) directly from memory
+- Support loading in-memory ELF shared objects (lib*.so) without a file
+- Support arm/arm64/x86/x86_64/riscv64 architectures
 - Implemented in 100% pure Java 1.8
-- No shared libraries (lib*.so) are shipped with the library
+- No shared libraries (lib*.so) or assets files are shipped with the library
 - No `System.loadLibrary` or `System.load` is used
 - No temporary files are created on the disk (does not require a writable path/mount point)
 - Small, no dependencies

demo-app/src/main/java/com/example/test/app/TestMainActivity.java

@@ -73,6 +73,7 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         }).start();
     }
 
+    @SuppressLint("SetTextI18n")
     private void performTestsAsync() {
         new Thread(() -> {
             if (WAIT_FOR_NATIVE_DEBUGGER) {
@@ -114,9 +115,13 @@ private String runTests() {
         sb.append("\n");
         sb.append("ISA = ").append(NativeHelper.getIsaName(NativeHelper.getCurrentRuntimeIsa()));
         sb.append("\n");
-        sb.append("SDK_INT = ").append(Build.VERSION.SDK_INT);
-        sb.append("\n");
-        sb.append("Build.VERSION.CODENAME = ").append(Build.VERSION.CODENAME);
+        sb.append("SDK_INT = ");
+        if ("REL".equals(Build.VERSION.CODENAME)) {
+            sb.append(Build.VERSION.SDK_INT);
+        } else {
+            // dev preview
+            sb.append(Build.VERSION.CODENAME).append(" ").append(Build.VERSION.SDK_INT);
+        }
         sb.append("\n");
         sb.append("Page size = ").append(Os.sysconf(OsConstants._SC_PAGESIZE));
         sb.append("\n");
@@ -128,6 +133,7 @@ private String runTests() {
                 __NR_uname = 63;
                 break;
             case NativeHelper.ISA_ARM64:
+            case NativeHelper.ISA_RISCV64:
                 __NR_uname = 160;
                 break;
             case NativeHelper.ISA_X86: