Add riscv64 support

native/src/Application.mk

@@ -1,5 +1,5 @@
 APP_BUILD_SCRIPT := src/Android.mk
-APP_ABI          := armeabi-v7a arm64-v8a x86 x86_64
+APP_ABI          := armeabi-v7a arm64-v8a x86 x86_64 riscv64
 APP_CFLAGS       := -Wall -Oz -fomit-frame-pointer -flto
 APP_LDFLAGS      := -flto -Wl,--icf=all
 APP_CPPFLAGS     := -std=c++23

native/src/base/include/embed.hpp

@@ -6,6 +6,8 @@
 #include <x86_binaries.h>
 #elif defined(__x86_64__)
 #include <x86_64_binaries.h>
+#elif defined(__riscv)
+#include <riscv64_binaries.h>
 #else
 #error Unsupported ABI
 #endif

native/src/core/module.cpp

@@ -418,6 +418,9 @@ static void collect_modules(bool open_zygisk) {
 #elif defined(__x86_64__)
                 info.z32 = openat(modfd, "zygisk/x86.so", O_RDONLY | O_CLOEXEC);
                 info.z64 = openat(modfd, "zygisk/x86_64.so", O_RDONLY | O_CLOEXEC);
+#elif defined(__riscv)
+                info.z32 = -1;
+                info.z64 = openat(modfd, "zygisk/riscv64.so", O_RDONLY | O_CLOEXEC);
 #else
 #error Unsupported ABI
 #endif

native/src/core/zygisk/hook.cpp

@@ -313,6 +313,14 @@ static const NativeBridgeRuntimeCallbacks* find_runtime_callbacks(struct _Unwind
         if (val >= start && val < end)
             return reinterpret_cast<const NativeBridgeRuntimeCallbacks*>(val);
     }
+#elif defined(__riscv)
+    // x8-x9, x18-x27 callee-saved registers
+    for (int i : {8, 9, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27}) {
+        auto val = static_cast<uintptr_t>(_Unwind_GetGR(ctx, i));
+        ZLOGV("x%d = %p\n", i, reinterpret_cast<void *>(val));
+        if (val >= start && val < end)
+            return reinterpret_cast<const NativeBridgeRuntimeCallbacks*>(val);
+    }
 #else
 #error "Unsupported architecture"
 #endif

native/src/external/Android.mk

@@ -215,6 +215,9 @@ LOCAL_SRC_FILES := \
     selinux/libsepol/cil/src/cil_write_ast.c
 
 LOCAL_CFLAGS := -Wno-unused-but-set-variable
+ifeq ($(TARGET_ARCH),riscv64)
+LOCAL_CFLAGS += -DHAVE_REALLOCARRAY
+endif
 include $(BUILD_STATIC_LIBRARY)
 
 # libselinux.a