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Minor code cleanup

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This commit is contained in:
Starlet Leonhart 2019-07-02 17:43:49 -04:00
parent e108d4a0be
commit 040121340a
7 changed files with 76 additions and 56 deletions
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38
app/src/main/cpp/core/arm/cpu.cpp
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@ -9,48 +9,56 @@ namespace core::cpu {
void HookInterrupt(uc_engine *uc, uint32_t intno, void *user_data); void HookInterrupt(uc_engine *uc, uint32_t intno, void *user_data);
bool Initialize() { bool Initialize()
{
uc_open(UC_ARCH_ARM64, UC_MODE_ARM, &uc); uc_open(UC_ARCH_ARM64, UC_MODE_ARM, &uc);
uc_hook hook{}; uc_hook hook{};
uc_hook_add(uc, &hook, UC_HOOK_INTR, (void *) HookInterrupt, 0, 1, 0); uc_hook_add(uc, &hook, UC_HOOK_INTR, (void *) HookInterrupt, 0, 1, 0);
// Map stack memory // Map stack memory
if (!memory::Map(0x3000000, 0x1000000, "stack")) return false; if (!memory::Map(0x3000000, 0x1000000, "Stack")) return false;
SetRegister(UC_ARM64_REG_SP, 0x3100000); SetRegister(UC_ARM64_REG_SP, 0x3100000);
// Map TLS memory // Map TLS memory
if (!memory::Map(0x2000000, 0x1000, "tls")) return false; if (!memory::Map(0x2000000, 0x1000, "TLS")) return false;
SetRegister(UC_ARM64_REG_TPIDRRO_EL0, 0x2000000); SetRegister(UC_ARM64_REG_TPIDRRO_EL0, 0x2000000);
return true; return true;
} }
void Run(uint64_t address) { void Run(uint64_t address)
{
uc_err err = uc_emu_start(uc, address, 1ULL << 63, 0, 0); uc_err err = uc_emu_start(uc, address, 1ULL << 63, 0, 0);
if (err) if (err) syslog(LOG_ERR, "uc_emu_start failed: %s", uc_strerror(err));
syslog(LOG_ERR, "uc_emu_start failed: %s", uc_strerror(err));
} }
uint64_t GetRegister(uint32_t regid) { uint64_t GetRegister(uint32_t regid)
{
uint64_t registerValue; uint64_t registerValue;
uc_reg_read(uc, regid, &registerValue); uc_reg_read(uc, regid, &registerValue);
return registerValue; return registerValue;
} }
void SetRegister(uint32_t regid, uint64_t value) { void SetRegister(uint32_t regid, uint64_t value)
{
uc_reg_write(uc, regid, &value); uc_reg_write(uc, regid, &value);
} }
void HookInterrupt(uc_engine *uc, uint32_t intno, void *user_data) { void HookInterrupt(uc_engine *uc, uint32_t intno, void *user_data)
if (intno == 2) { {
if (intno == 2)
{
uint32_t instr{}; uint32_t instr{};
uc_mem_read(uc, GetRegister(UC_ARM64_REG_PC) - 4, &instr, 4); uc_mem_read(uc, GetRegister(UC_ARM64_REG_PC) - 4, &instr, 4);
uint32_t svcId = instr >> 5 & 0xFF; uint32_t svcId = instr >> 5 & 0xFF;
if(core::kernel::SvcHandler(svcId) == 0x177202) if (core::kernel::SvcHandler(svcId) == 0x177202)
uc_close(uc); uc_close(uc);
} else { }
else
{
syslog(LOG_ERR, "Unhandled interrupt #%i", intno); syslog(LOG_ERR, "Unhandled interrupt #%i", intno);
uc_close(uc); uc_close(uc);
} }
@ -62,13 +70,15 @@ namespace core::memory {
bool Map(uint64_t address, size_t size, std::string label) { bool Map(uint64_t address, size_t size, std::string label) {
void *ptr = mmap((void*)(address), size, PROT_EXEC | PROT_READ | PROT_WRITE, void *ptr = mmap((void*)(address), size, PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, 0, 0); MAP_PRIVATE | MAP_ANON, 0, 0);
if (!ptr) { if (!ptr)
{
syslog(LOG_ERR, "Failed mapping region '%s'", label.c_str()); syslog(LOG_ERR, "Failed mapping region '%s'", label.c_str());
return false; return false;
} }
uc_err err = uc_mem_map_ptr(core::cpu::uc, address, size, UC_PROT_ALL, (void*)(address)); uc_err err = uc_mem_map_ptr(core::cpu::uc, address, size, UC_PROT_ALL, (void*)(address));
if (err) { if (err)
{
syslog(LOG_ERR, "UC map failed: %s", uc_strerror(err)); syslog(LOG_ERR, "UC map failed: %s", uc_strerror(err));
return false; return false;
} }

36
app/src/main/cpp/core/arm/memory.cpp
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@ -4,24 +4,24 @@
#include "memory.h" #include "memory.h"
namespace core::memory { namespace core::memory {
// std::vector<MemoryRegion> memoryRegions; /*std::vector<MemoryRegion> memoryRegions;
//
// bool Map(uint64_t address, size_t size, std::string label) { bool Map(uint64_t address, size_t size, std::string label) {
// void* ptr = mmap((void*)(address), size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0, 0); void* ptr = mmap((void*)(address), size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0, 0);
// if (!ptr) { if (!ptr) {
// syslog(LOG_ERR, "Failed mapping region '%s'", label.c_str()); syslog(LOG_ERR, "Failed mapping region '%s'", label.c_str());
// return false; return false;
// } }
//
// syslog(LOG_INFO, "Mapping region '%s' to 0x%x, pointer %x", label.c_str(), address, (uint64_t)ptr); syslog(LOG_INFO, "Mapping region '%s' to 0x%x, pointer %x", label.c_str(), address, (uint64_t)ptr);
//
// if (core::cpu::MapUnicorn(address, size, ptr)) return false; if (core::cpu::MapUnicorn(address, size, ptr)) return false;
//
// syslog(LOG_INFO, "Successfully mapped region '%s' to 0x%x", label.c_str(), address); syslog(LOG_INFO, "Successfully mapped region '%s' to 0x%x", label.c_str(), address);
//
// memoryRegions.push_back({label, address, size, ptr}); memoryRegions.push_back({label, address, size, ptr});
// return true; return true;
// } }*/
// TODO: Boundary checks // TODO: Boundary checks
void Write(void* data, uint64_t offset, size_t size) { std::memcpy((void*)(offset), data, size); } void Write(void* data, uint64_t offset, size_t size) { std::memcpy((void*)(offset), data, size); }

14
app/src/main/cpp/core/arm/memory.h
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@ -5,25 +5,25 @@
#define BASE_ADDRESS 0x80000000 #define BASE_ADDRESS 0x80000000
namespace core::memory { namespace core::memory {
struct MemoryRegion { /*struct MemoryRegion {
std::string label; std::string label;
uint64_t address; uint64_t address;
size_t size; size_t size;
void* ptr; void* ptr;
}; };*/
bool Map(uint64_t address, size_t size, std::string label = {}); bool Map(uint64_t address, size_t size, std::string label = {});
void Write(void* data, uint64_t offset, size_t size); void Write(void* data, uint64_t offset, size_t size);
void WriteU8 (uint8_t value, uint64_t offset); void WriteU8(uint8_t value, uint64_t offset);
void WriteU16(uint16_t value, uint64_t offset); void WriteU16(uint16_t value, uint64_t offset);
void WriteU32(uint32_t value, uint64_t offset); void WriteU32(uint32_t value, uint64_t offset);
void WriteU64(uint64_t value, uint64_t offset); void WriteU64(uint64_t value, uint64_t offset);
void Read(void* destination, uint64_t offset, size_t size); void Read(void* destination, uint64_t offset, size_t size);
uint8_t ReadU8 (uint64_t offset); uint8_t ReadU8(uint64_t offset);
uint16_t ReadU16(uint64_t offset); uint16_t ReadU16(uint64_t offset);
uint32_t ReadU32(uint64_t offset); uint32_t ReadU32(uint64_t offset);
uint64_t ReadU64(uint64_t offset); uint64_t ReadU64(uint64_t offset);

5
app/src/main/cpp/core/hos/kernel/svc.cpp
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@ -8,7 +8,8 @@
using namespace core::cpu; using namespace core::cpu;
namespace core::kernel { namespace core::kernel {
static uint32_t OutputDebugString() { static uint32_t OutputDebugString()
{
std::string debug(GetRegister(UC_ARM64_REG_X1), '\0'); std::string debug(GetRegister(UC_ARM64_REG_X1), '\0');
memory::Read((void*)debug.data(), GetRegister(UC_ARM64_REG_X0), GetRegister(UC_ARM64_REG_X1)); memory::Read((void*)debug.data(), GetRegister(UC_ARM64_REG_X0), GetRegister(UC_ARM64_REG_X1));
@ -152,7 +153,7 @@ namespace core::kernel {
{ {
std::pair<int, uint32_t(*)()>* result = &(svcTable[svc]); std::pair<int, uint32_t(*)()>* result = &(svcTable[svc]);
if(result->second) if (result->second)
return result->second(); return result->second();
else else
{ {

30
app/src/main/cpp/core/hos/loaders/nro.cpp
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@ -17,12 +17,14 @@ void ReadDataFromFile(std::string file, char* output, uint32_t offset, size_t si
} }
namespace core::loader { namespace core::loader {
bool LoadNro(std::string file) { bool LoadNro(std::string filePath)
syslog(LOG_INFO, "Loading NRO file %s\n", file.c_str()); {
syslog(LOG_INFO, "Loading NRO file %s\n", filePath.c_str());
NroHeader header; NroHeader header;
ReadDataFromFile(file, reinterpret_cast<char *>(&header), 0x0, sizeof(NroHeader)); ReadDataFromFile(filePath, reinterpret_cast<char *>(&header), 0x0, sizeof(NroHeader));
if (header.magic != 0x304F524E) { if (header.magic != 0x304F524E)
{
syslog(LOG_ERR, "Invalid NRO magic 0x%x\n", header.magic); syslog(LOG_ERR, "Invalid NRO magic 0x%x\n", header.magic);
return false; return false;
} }
@ -32,21 +34,21 @@ namespace core::loader {
ro.resize (header.segments[1].size); ro.resize (header.segments[1].size);
data.resize(header.segments[2].size); data.resize(header.segments[2].size);
ReadDataFromFile(file, reinterpret_cast<char *>(text.data()), header.segments[0].fileOffset, header.segments[0].size); ReadDataFromFile(filePath, reinterpret_cast<char *>(text.data()), header.segments[0].fileOffset, header.segments[0].size);
ReadDataFromFile(file, reinterpret_cast<char *>(ro.data()), header.segments[1].fileOffset, header.segments[1].size); ReadDataFromFile(filePath, reinterpret_cast<char *>(ro.data()), header.segments[1].fileOffset, header.segments[1].size);
ReadDataFromFile(file, reinterpret_cast<char *>(data.data()), header.segments[2].fileOffset, header.segments[2].size); ReadDataFromFile(filePath, reinterpret_cast<char *>(data.data()), header.segments[2].fileOffset, header.segments[2].size);
if( !memory::Map(BASE_ADDRESS, header.segments[0].size, ".text") ||
!memory::Map(BASE_ADDRESS + header.segments[0].size, header.segments[1].size, ".ro") ||
!memory::Map(BASE_ADDRESS + header.segments[0].size + header.segments[1].size, header.segments[2].size, ".data") ||
!memory::Map(BASE_ADDRESS + header.segments[0].size + header.segments[1].size + header.segments[2].size, header.bssSize, ".bss")) {
if (!memory::Map(BASE_ADDRESS, header.segments[0].size, ".text") ||
!memory::Map(BASE_ADDRESS + header.segments[0].size, header.segments[1].size, ".ro") ||
!memory::Map(BASE_ADDRESS + header.segments[0].size + header.segments[1].size, header.segments[2].size, ".data") ||
!memory::Map(BASE_ADDRESS + header.segments[0].size + header.segments[1].size + header.segments[2].size, header.bssSize, ".bss"))
{
syslog(LOG_ERR, "Failed mapping regions for executable"); syslog(LOG_ERR, "Failed mapping regions for executable");
return false; return false;
} }
memory::Write(text.data(), BASE_ADDRESS, text.size()); memory::Write(text.data(), BASE_ADDRESS, text.size());
memory::Write(ro.data(), BASE_ADDRESS + header.segments[0].size, ro.size()); memory::Write(ro.data(), BASE_ADDRESS + header.segments[0].size, ro.size());
memory::Write(data.data(), BASE_ADDRESS + header.segments[0].size + header.segments[1].size, data.size()); memory::Write(data.data(), BASE_ADDRESS + header.segments[0].size + header.segments[1].size, data.size());
return true; return true;
} }

2
app/src/main/cpp/core/hos/loaders/nro.h
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@ -27,5 +27,5 @@ namespace core::loader {
NroSegmentHeader extraSegments[3]; NroSegmentHeader extraSegments[3];
}; };
bool LoadNro(std::string file); bool LoadNro(std::string filePath);
} }

7
app/src/main/cpp/lightswitch.cpp
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@ -1,12 +1,19 @@
#include <jni.h> #include <jni.h>
#include <string> #include <string>
#include <syslog.h> #include <syslog.h>
#include <core/arm/cpu.h>
#include <core/hos/loaders/nro.h>
#include <core/arm/memory.h>
extern "C" JNIEXPORT jstring JNICALL extern "C" JNIEXPORT jstring JNICALL
Java_gq_cyuubi_lightswitch_MainActivity_stringFromJNI( Java_gq_cyuubi_lightswitch_MainActivity_stringFromJNI(
JNIEnv *env, JNIEnv *env,
jobject /* this */) { jobject /* this */) {
core::cpu::Initialize();
core::loader::LoadNro("/sdcard/test.nro");
core::cpu::Run(BASE_ADDRESS);
std::string finished = "finished!"; std::string finished = "finished!";
return env->NewStringUTF(finished.c_str()); return env->NewStringUTF(finished.c_str());
} }