LSPlant/test/src/main/jni/test.cpp

#include <dobby.h>
#include <lsplant.hpp>
#include <sys/mman.h>

#define _uintval(p)               reinterpret_cast<uintptr_t>(p)
#define _ptr(p)                   reinterpret_cast<void *>(p)
#define _align_up(x, n)           (((x) + ((n) - 1)) & ~((n) - 1))
#define _align_down(x, n)         ((x) & -(n))
#define _page_size                4096
#define _page_align(n)            _align_up(static_cast<uintptr_t>(n), _page_size)
#define _ptr_align(x)             _ptr(_align_down(reinterpret_cast<uintptr_t>(x), _page_size))
#define _make_rwx(p, n)           ::mprotect(_ptr_align(p), \
                                              _page_align(_uintval(p) + n) != _page_align(_uintval(p)) ? _page_align(n) + _page_size : _page_align(n), \
                                              PROT_READ | PROT_WRITE | PROT_EXEC)

bool init_result;

void* InlineHooker(void* target, void* hooker) {
    _make_rwx(target, _page_size);
    void* origin_call;
    if (DobbyHook(target, hooker, &origin_call) == RS_SUCCESS) {
        return origin_call;
    } else {
        return nullptr;
    }
}

bool InlineUnhooker(void* func) {
    return DobbyDestroy(func) == RT_SUCCESS;
}

void* ArtSymbolResolver(std::string_view symbol_name) {
    return DobbySymbolResolver("libart.so", symbol_name.data());
}

extern "C"
JNIEXPORT jboolean JNICALL
Java_org_lsposed_lsplant_LSPTest_initHooker(JNIEnv*, jclass) {
    return init_result;
}

JNIEXPORT jint JNICALL
JNI_OnLoad(JavaVM* vm, void* reserved) {
    JNIEnv* env;
    if (vm->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK) {
        return JNI_ERR;
    }
    lsplant::InitInfo initInfo{
            .inline_hooker = InlineHooker,
            .inline_unhooker = InlineUnhooker,
            .art_symbol_resolver = ArtSymbolResolver
    };
    init_result = lsplant::Init(env, initInfo);
    return JNI_VERSION_1_6;
}