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Code clean up by friendly neighborhood Cyuubi

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This commit is contained in:
Starlet Leonhart 2019-08-20 16:39:16 -04:00 committed by ◱ PixelyIon
parent 985f2e67a2
commit 7dd04afdcf
11 changed files with 105 additions and 90 deletions
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23
app/src/main/cpp/lightswitch.cpp
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@ -6,26 +6,18 @@
#include "switch/device.h"
#include "switch/common.h"
std::thread *game_thread;
void signal_handle(int sig_no) {
throw lightSwitch::exception("A signal has been raised: " + std::to_string(sig_no));
}
std::thread *emu_thread;
void thread_main(std::string rom_path, std::string pref_path, std::string log_path) {
auto log = std::make_shared<lightSwitch::Logger>(log_path);
log->write(lightSwitch::Logger::INFO, "Launching ROM {0}", rom_path);
// long long i = 0;
// while(true){
// log->write(lightSwitch::Logger::INFO, "#{0}", i);
// sleep(1);
// i++;
// }
auto settings = std::make_shared<lightSwitch::Settings>(pref_path);
try {
lightSwitch::device device(log, settings);
device.run(rom_path);
log->write(lightSwitch::Logger::INFO, "Emulation has ended!");
log->write(lightSwitch::Logger::INFO, "Emulation has ended.");
} catch (std::exception &e) {
log->write(lightSwitch::Logger::ERROR, e.what());
} catch (...) {
@ -40,10 +32,11 @@ Java_emu_lightswitch_MainActivity_loadFile(JNIEnv *env, jobject instance, jstrin
const char *rom_path = env->GetStringUTFChars(rom_path_, 0);
const char *pref_path = env->GetStringUTFChars(pref_path_, 0);
const char *log_path = env->GetStringUTFChars(log_path_, 0);
// std::signal(SIGABRT, signal_handle);
if (game_thread) pthread_kill(game_thread->native_handle(), SIGABRT);
if (emu_thread) pthread_kill(emu_thread->native_handle(), SIGABRT);
// Running on UI thread is not a good idea, any crashes and such will be propagated
game_thread = new std::thread(thread_main, std::string(rom_path, strlen(rom_path)), std::string(pref_path, strlen(pref_path)), std::string(log_path, strlen(log_path)));
emu_thread = new std::thread(thread_main, std::string(rom_path, strlen(rom_path)), std::string(pref_path, strlen(pref_path)), std::string(log_path, strlen(log_path)));
env->ReleaseStringUTFChars(rom_path_, rom_path);
env->ReleaseStringUTFChars(pref_path_, pref_path);
env->ReleaseStringUTFChars(log_path_, log_path);

3
app/src/main/cpp/switch/common.h
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@ -63,9 +63,8 @@ namespace lightSwitch {
struct device_state {
std::shared_ptr<hw::Cpu> cpu;
std::shared_ptr<hw::Memory> mem;
std::shared_ptr<hw::Memory> memory;
std::shared_ptr<Settings> settings;
std::shared_ptr<Logger> logger;
};
//typedef std::shared_ptr<device_state_struct> device_state;
}

27
app/src/main/cpp/switch/constant.h
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@ -23,7 +23,6 @@ namespace lightSwitch {
namespace instr {
// https://developer.arm.com/docs/ddi0596/latest/base-instructions-alphabetic-order/brk-breakpoint-instruction
// For some reason if value is set to uint16_t it isn't read correctly ?
struct brk {
brk(uint16_t val) {
start = 0x0; // First 5 bits of an BRK instruction are 0
@ -35,9 +34,9 @@ namespace lightSwitch {
return (start == 0x0 && end == 0x6A1);
}
uint8_t start:5;
uint32_t value:16;
uint16_t end:11;
uint8_t start : 5;
uint32_t value : 16;
uint16_t end : 11;
};
// https://developer.arm.com/docs/ddi0596/latest/base-instructions-alphabetic-order/svc-supervisor-call
@ -46,9 +45,9 @@ namespace lightSwitch {
return (start == 0x1 && end == 0x6A0);
}
uint8_t start:5;
uint32_t value:16;
uint16_t end:11;
uint8_t start : 5;
uint32_t value : 16;
uint16_t end : 11;
};
// https://developer.arm.com/docs/ddi0596/latest/base-instructions-alphabetic-order/mrs-move-system-register
@ -57,16 +56,12 @@ namespace lightSwitch {
return (end == 0xD53);
}
uint8_t Xt:5;
uint32_t Sreg:15;
uint16_t end:12;
uint8_t dst_reg : 5;
uint32_t src_reg : 15;
uint16_t end : 12;
};
};
enum xreg {
x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, x29, x30
};
enum wreg {
w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15, w16, w17, w18, w19, w20, w21, w22, w23, w24, w25, w26, w27, w28, w29, w30
};
enum xreg { x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, x29, x30 };
enum wreg { w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15, w16, w17, w18, w19, w20, w21, w22, w23, w24, w25, w26, w27, w28, w29, w30 };
}

25
app/src/main/cpp/switch/device.h
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@ -10,27 +10,18 @@ namespace lightSwitch {
std::shared_ptr<hw::Memory> memory;
os::OS os;
device_state state;
const std::map<std::string, int> ext_case = {
{"nro", 1},
{"NRO", 1}
};
public:
device(std::shared_ptr<Logger> &logger, std::shared_ptr<Settings> &settings) : cpu(new hw::Cpu()), memory(new hw::Memory()), state{cpu, memory, settings, logger}, os({cpu, memory, settings, logger}) {};
void run(std::string rom_file) {
try {
switch (ext_case.at(rom_file.substr(rom_file.find_last_of('.') + 1))) {
case 1: {
loader::NroLoader loader(rom_file, state);
break;
}
default:
break;
}
cpu->Execute(hw::Memory::text, memory, os.SvcHandler, &state);
} catch (std::out_of_range &e) {
throw exception("The ROM extension wasn't recognized.");
}
std::string rom_ext = rom_file.substr(rom_file.find_last_of('.') + 1);
std::transform(rom_ext.begin(), rom_ext.end(), rom_ext.begin(),
[](unsigned char c){ return std::tolower(c); });
if (rom_ext == "nro") loader::NroLoader loader(rom_file, state);
else throw exception("Unsupported ROM extension.");
cpu->Execute(hw::Memory::text, memory, os.SvcHandler, &state);
}
};
};

57
app/src/main/cpp/switch/hw/cpu.cpp
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@ -8,30 +8,30 @@ namespace lightSwitch::hw {
long *Cpu::ReadMemory(uint64_t address) { // Return a single word (32-bit)
status = ptrace(PTRACE_PEEKDATA, child, address, NULL);
if (status == -1) throw std::runtime_error("Cannot read memory");
if (status == -1) throw std::runtime_error("Cannot read memory!");
return &status;
}
void Cpu::WriteMemory(uint64_t address) { // Write a single word (32-bit)
status = ptrace(PTRACE_GETREGSET, child, NT_PRSTATUS, &iov);
if (status == -1) throw std::runtime_error("Cannot write memory");
if (status == -1) throw std::runtime_error("Cannot write memory!");
}
void Cpu::ReadRegisters() { // Read all registers into 'regs'
iov = {&regs, sizeof(regs)};
status = ptrace(PTRACE_GETREGSET, child, NT_PRSTATUS, &iov);
if (status == -1) throw std::runtime_error("Cannot read registers");
if (status == -1) throw std::runtime_error("Cannot read registers!");
}
void Cpu::WriteRegisters() { // Write all registers from 'regs'
iov = {&regs, sizeof(regs)};
status = ptrace(PTRACE_SETREGSET, child, NT_PRSTATUS, &iov);
if (status == -1) throw std::runtime_error("Cannot write registers");
if (status == -1) throw std::runtime_error("Cannot write registers!");
}
void Cpu::ResumeProcess() { // Resumes a process stopped due to a signal
status = ptrace(PTRACE_CONT, child, NULL, NULL);
if (status == -1) throw std::runtime_error("Cannot resume process");
if (status == -1) throw std::runtime_error("Cannot resume process!");
}
void Cpu::WriteBreakpoint(uint64_t address_, uint64_t size) {
@ -39,13 +39,20 @@ namespace lightSwitch::hw {
for (uint64_t iter = 0; iter < size; iter++) {
auto instr_svc = reinterpret_cast<instr::svc *>(address + iter);
auto instr_mrs = reinterpret_cast<instr::mrs *>(address + iter);
if (instr_svc->verify()) {
// syslog(LOG_WARNING, "Found SVC call: 0x%X, At location 0x%X", instr_svc->value, ((uint64_t)address)+iter);
#ifdef NDEBUG
syslog(LOG_WARNING, "Found SVC call: 0x%X, At location 0x%X", instr_svc->value, ((uint64_t)address)+iter);
#endif
instr::brk brk(static_cast<uint16_t>(instr_svc->value));
address[iter] = *reinterpret_cast<uint32_t *>(&brk);
} else if (instr_mrs->verify() && instr_mrs->Sreg == constant::tpidrro_el0) {
// syslog(LOG_WARNING, "Found MRS call: 0x%X, At location 0x%X", instr_mrs->Xt, ((uint64_t)address)+iter);
instr::brk brk(static_cast<uint16_t>(constant::svc_last + 1 + instr_mrs->Xt));
} else if (instr_mrs->verify() && instr_mrs->src_reg == constant::tpidrro_el0) {
#ifdef NDEBUG
syslog(LOG_WARNING, "Found MRS call: 0x%X, At location 0x%X", instr_mrs->dst_reg, ((uint64_t)address)+iter);
#endif
instr::brk brk(static_cast<uint16_t>(constant::svc_last + 1 + instr_mrs->dst_reg));
address[iter] = *reinterpret_cast<uint32_t *>(&brk);
}
}
@ -53,22 +60,31 @@ namespace lightSwitch::hw {
void Cpu::Execute(Memory::Region region, std::shared_ptr<Memory> memory, std::function<void(uint16_t, void *)> svc_handler, void *device) {
tls = memory->region_map.at(hw::Memory::tls).address;
hw::Memory::RegionData rom = memory->region_map.at(hw::Memory::text);
WriteBreakpoint(rom.address, rom.size);
child = ExecuteChild(rom.address);
hw::Memory::RegionData exec = memory->region_map.at(hw::Memory::text);
WriteBreakpoint(exec.address, exec.size);
child = ExecuteChild(exec.address);
int stat = 0;
while (waitpid(child, &stat, 0)) {
if (WIFSTOPPED(stat)) {
ReadRegisters();
//syslog(LOG_INFO, "PC is at 0x%X", regs.pc);
#ifdef NDEBUG
syslog(LOG_INFO, "PC is at 0x%X", regs.pc);
#endif
if (!regs.pc || regs.pc == 0xBADC0DE) break;
// We store the instruction value as the immediate value. 0x0 to 0x7F are SVC, 0x80 to 0x9E is MRS for TPIDRRO_EL0.
auto instr = reinterpret_cast<instr::brk *>(ReadMemory(regs.pc));
if (instr->verify()) {
if (instr->value <= constant::svc_last) {
svc_handler(static_cast<uint16_t>(instr->value), device);
syslog(LOG_ERR, "SVC has been called 0x%X", instr->value);
if (stop) break;
if (halt) break;
} else if (instr->value > constant::svc_last && instr->value <= constant::svc_last + constant::num_regs) {
// Catch MRS that reads the value of TPIDRRO_EL0 (TLS)
// https://switchbrew.org/wiki/Thread_Local_Storage
@ -76,27 +92,30 @@ namespace lightSwitch::hw {
syslog(LOG_ERR, "MRS has been called 0x%X", instr->value - (constant::svc_last + 1));
} else syslog(LOG_ERR, "Received unhandled BRK 0x%X", instr->value);
}
regs.pc += 4; // Increment program counter by a single instruction (32 bits)
WriteRegisters();
} else if (WIFEXITED(stat))
break;
} else if (WIFEXITED(stat)) break;
ResumeProcess();
}
kill(child, SIGABRT);
child = 0;
stop = false;
halt = false; // TODO: Global variable
}
pid_t Cpu::ExecuteChild(uint64_t address) {
pid_t pid = fork();
if (!pid) {
ptrace(PTRACE_TRACEME, 0, NULL, NULL);
asm volatile("BR %0"::"r"(address));
asm volatile("br %0" :: "r"(address));
}
return pid;
}
void Cpu::StopExecution() { stop = true; }
void Cpu::StopExecution() { halt = true; }
uint64_t Cpu::GetRegister(xreg reg_id) {
return regs.regs[reg_id];

2
app/src/main/cpp/switch/hw/cpu.h
View File

@ -13,7 +13,7 @@
namespace lightSwitch::hw {
class Cpu {
private:
bool stop = false;
bool halt = false;
long status = 0;
pid_t child;
iovec iov;

4
app/src/main/cpp/switch/hw/memory.cpp
View File

@ -13,19 +13,23 @@ namespace lightSwitch::hw {
void *ptr = mmap((void *) address, size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON | MAP_FIXED, 0, 0);
if (ptr == MAP_FAILED)
throw exception("An occurred while mapping region: " + std::string(strerror(errno)));
region_map.insert(std::pair<Region, RegionData>(region, {address, size}));
}
void Memory::Remap(Region region, size_t size) {
RegionData region_data = region_map.at(region);
void *ptr = mremap(reinterpret_cast<void *>(region_data.address), region_data.size, size, 0);
if (ptr == MAP_FAILED)
throw exception("An occurred while remapping region: " + std::string(strerror(errno)));
region_map[region].size = size;
}
void Memory::Unmap(Region region) {
RegionData region_data = region_map.at(region);
int err = munmap(reinterpret_cast<void *>(region_data.address), region_data.size);
if (err == -1)
throw exception("An occurred while unmapping region: " + std::string(strerror(errno)));

31
app/src/main/cpp/switch/loader/nro.cpp
View File

@ -6,7 +6,7 @@ namespace lightSwitch::loader {
NroHeader header{};
ReadOffset((uint32_t *) &header, 0x0, sizeof(NroHeader));
if (header.magic != constant::nro_magic)
throw exception(fmt::format("Invalid NRO magic 0x{0:x}", header.magic));
throw exception(fmt::format("Invalid NRO magic! 0x{0:X}", header.magic));
auto text = new uint32_t[header.text.size]();
auto ro = new uint32_t[header.ro.size]();
@ -16,18 +16,25 @@ namespace lightSwitch::loader {
ReadOffset(ro, header.ro.offset, header.ro.size);
ReadOffset(data, header.data.offset, header.data.size);
state.mem->Map(constant::base_addr, header.text.size, hw::Memory::text);
state.logger->write(Logger::DEBUG, "Successfully mapped region .text to 0x{0:x}, size is 0x{1:x}.", constant::base_addr, header.text.size);
state.mem->Map(constant::base_addr + header.text.size, header.ro.size, hw::Memory::rodata);
state.logger->write(Logger::DEBUG, "Successfully mapped region .ro to 0x{0:x}, size is 0x{1:x}.", constant::base_addr + header.text.size, header.ro.size);
state.mem->Map(constant::base_addr + header.text.size + header.ro.size, header.data.size, hw::Memory::data);
state.logger->write(Logger::DEBUG, "Successfully mapped region .data to 0x{0:x}, size is 0x{1:x}.", constant::base_addr + header.text.size + header.ro.size, header.data.size);
state.mem->Map(constant::base_addr + header.text.size + header.ro.size + header.data.size, header.bssSize, hw::Memory::bss);
state.logger->write(Logger::DEBUG, "Successfully mapped region .bss to 0x{0:x}, size is 0x{1:x}.", constant::base_addr + header.text.size + header.ro.size + header.data.size, header.bssSize);
state.memory->Map(constant::base_addr, header.text.size, hw::Memory::text);
state.logger->write(Logger::DEBUG, "Successfully mapped region .text @ 0x{0:X}, Size = 0x{1:X}",
constant::base_addr, header.text.size);
state.mem->Write(text, constant::base_addr, header.text.size);
state.mem->Write(ro, constant::base_addr + header.text.size, header.ro.size);
state.mem->Write(data, constant::base_addr + header.text.size + header.ro.size, header.data.size);
state.memory->Map(constant::base_addr + header.text.size, header.ro.size, hw::Memory::rodata);
state.logger->write(Logger::DEBUG, "Successfully mapped region .ro @ 0x{0:X}, Size = 0x{1:X}",
constant::base_addr + header.text.size, header.ro.size);
state.memory->Map(constant::base_addr + header.text.size + header.ro.size, header.data.size, hw::Memory::data);
state.logger->write(Logger::DEBUG, "Successfully mapped region .data @ 0x{0:X}, Size = 0x{1:X}",
constant::base_addr + header.text.size + header.ro.size, header.data.size);
state.memory->Map(constant::base_addr + header.text.size + header.ro.size + header.data.size, header.bssSize, hw::Memory::bss);
state.logger->write(Logger::DEBUG, "Successfully mapped region .bss @ 0x{0:X}, Size = 0x{1:X}",
constant::base_addr + header.text.size + header.ro.size + header.data.size, header.bssSize);
state.memory->Write(text, constant::base_addr, header.text.size);
state.memory->Write(ro, constant::base_addr + header.text.size, header.ro.size);
state.memory->Write(data, constant::base_addr + header.text.size + header.ro.size, header.data.size);
delete[] text;
delete[] ro;

4
app/src/main/cpp/switch/os/ipc.cpp
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@ -13,12 +13,12 @@ namespace lightSwitch::os::ipc {
data_pos = ((data_pos - 1) & ~(15U)) + 16; // ceil data_pos with multiples 16
data_ptr = &tls_ptr[data_pos + sizeof(command_struct)];
state.logger->write(Logger::DEBUG, "Type: 0x{:x}", (uint8_t) req_info->type);
state.logger->write(Logger::DEBUG, "Type: 0x{:X}", (uint8_t) req_info->type);
state.logger->write(Logger::DEBUG, "X descriptors: {}", (uint8_t) req_info->x_no);
state.logger->write(Logger::DEBUG, "A descriptors: {}", (uint8_t) req_info->a_no);
state.logger->write(Logger::DEBUG, "B descriptors: {}", (uint8_t) req_info->b_no);
state.logger->write(Logger::DEBUG, "W descriptors: {}", (uint8_t) req_info->w_no);
state.logger->write(Logger::DEBUG, "Raw data offset: 0x{:x}", data_pos);
state.logger->write(Logger::DEBUG, "Raw data offset: 0x{:X}", data_pos);
state.logger->write(Logger::DEBUG, "Raw data size: {}", (uint16_t) req_info->data_sz);
state.logger->write(Logger::DEBUG, "Payload Command ID: {}", *((uint32_t *) &tls_ptr[data_pos + 8]));
}

2
app/src/main/cpp/switch/os/os.cpp
View File

@ -9,7 +9,7 @@ namespace lightSwitch::os {
if (svc::svcTable[svc])
(*svc::svcTable[svc])(state);
else {
state.logger->write(Logger::ERROR, "Unimplemented SVC 0x{0:x}", svc);
state.logger->write(Logger::ERROR, "Unimplemented SVC 0x{0:X}", svc);
state.cpu->StopExecution();
}
}

17
app/src/main/cpp/switch/os/svc.cpp
View File

@ -7,28 +7,35 @@
namespace lightSwitch::os::svc {
void ConnectToNamedPort(device_state &state) {
char port[constant::port_size]{0};
state.mem->Read(port, state.cpu->GetRegister(xreg::x1), constant::port_size);
state.memory->Read(port, state.cpu->GetRegister(xreg::x1), constant::port_size);
if (std::strcmp(port, "sm:") == 0)
state.cpu->SetRegister(wreg::w1, constant::sm_handle);
else {
state.logger->write(Logger::ERROR, "svcConnectToNamedPort tried connecting to invalid port \"{0}\"", port);
state.cpu->StopExecution();
}
state.cpu->SetRegister(wreg::w0, 0);
}
void SendSyncRequest(device_state &state) {
state.logger->write(Logger::DEBUG, "svcSendSyncRequest called for handle 0x{0:x}.", state.cpu->GetRegister(xreg::x0));
state.logger->write(Logger::DEBUG, "svcSendSyncRequest called for handle 0x{0:X}.", state.cpu->GetRegister(xreg::x0));
uint8_t tls[constant::tls_ipc_size];
state.mem->Read(&tls, constant::tls_addr, constant::tls_ipc_size);
state.memory->Read(&tls, constant::tls_addr, constant::tls_ipc_size);
ipc::IpcRequest request(tls, state);
state.cpu->SetRegister(wreg::w0, 0);
}
void OutputDebugString(device_state &state) {
std::string debug(state.cpu->GetRegister(xreg::x1), '\0');
state.mem->Read((void *) debug.data(), state.cpu->GetRegister(xreg::x0), state.cpu->GetRegister(xreg::x1));
state.logger->write(Logger::INFO, "ROM Output: {0}", debug.c_str());
state.memory->Read((void *) debug.data(), state.cpu->GetRegister(xreg::x0), state.cpu->GetRegister(xreg::x1));
state.logger->write(Logger::INFO, "svcOutputDebugString: {0}", debug.c_str());
state.cpu->SetRegister(wreg::w0, 0);
}