GDB Stub Improvements (#508)
* GDB Stub should work now. * Applied clang-format. * Replaced htonll with swap64. * Tidy up.
This commit is contained in:
Hedges
bunnei
parent
5fb99e6a16
commit
39fb3e362c
@ -35,6 +35,17 @@ LoadDll LoadDll::g_load_dll;
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} \
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} while (0)
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static void CodeHook(uc_engine* uc, uint64_t address, uint32_t size, void* user_data) {
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GDBStub::BreakpointAddress bkpt =
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GDBStub::GetNextBreakpointFromAddress(address, GDBStub::BreakpointType::Execute);
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if (GDBStub::IsMemoryBreak() ||
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(bkpt.type != GDBStub::BreakpointType::None && address == bkpt.address)) {
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auto core = static_cast<ARM_Unicorn*>(user_data);
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core->RecordBreak(bkpt);
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uc_emu_stop(uc);
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}
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}
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static void InterruptHook(uc_engine* uc, u32 intNo, void* user_data) {
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u32 esr{};
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CHECKED(uc_reg_read(uc, UC_ARM64_REG_ESR, &esr));
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@ -67,6 +78,10 @@ ARM_Unicorn::ARM_Unicorn() {
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uc_hook hook{};
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CHECKED(uc_hook_add(uc, &hook, UC_HOOK_INTR, (void*)InterruptHook, this, 0, -1));
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CHECKED(uc_hook_add(uc, &hook, UC_HOOK_MEM_INVALID, (void*)UnmappedMemoryHook, this, 0, -1));
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if (GDBStub::IsServerEnabled()) {
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CHECKED(uc_hook_add(uc, &hook, UC_HOOK_CODE, (void*)CodeHook, this, 0, -1));
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last_bkpt_hit = false;
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}
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}
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ARM_Unicorn::~ARM_Unicorn() {
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@ -155,7 +170,11 @@ void ARM_Unicorn::SetTlsAddress(VAddr base) {
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}
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void ARM_Unicorn::Run() {
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ExecuteInstructions(std::max(CoreTiming::GetDowncount(), 0));
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if (GDBStub::IsServerEnabled()) {
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ExecuteInstructions(std::max(4000000, 0));
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} else {
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ExecuteInstructions(std::max(CoreTiming::GetDowncount(), 0));
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}
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}
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void ARM_Unicorn::Step() {
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@ -168,6 +187,18 @@ void ARM_Unicorn::ExecuteInstructions(int num_instructions) {
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MICROPROFILE_SCOPE(ARM_Jit);
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CHECKED(uc_emu_start(uc, GetPC(), 1ULL << 63, 0, num_instructions));
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CoreTiming::AddTicks(num_instructions);
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if (GDBStub::IsServerEnabled()) {
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if (last_bkpt_hit) {
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uc_reg_write(uc, UC_ARM64_REG_PC, &last_bkpt.address);
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}
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Kernel::Thread* thread = Kernel::GetCurrentThread();
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SaveContext(thread->context);
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if (last_bkpt_hit) {
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last_bkpt_hit = false;
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GDBStub::Break();
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}
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GDBStub::SendTrap(thread, 5);
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}
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}
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void ARM_Unicorn::SaveContext(ARM_Interface::ThreadContext& ctx) {
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@ -233,3 +264,8 @@ void ARM_Unicorn::PrepareReschedule() {
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}
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void ARM_Unicorn::ClearInstructionCache() {}
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void ARM_Unicorn::RecordBreak(GDBStub::BreakpointAddress bkpt) {
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last_bkpt = bkpt;
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last_bkpt_hit = true;
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}
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@ -7,6 +7,7 @@
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#include <unicorn/unicorn.h>
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#include "common/common_types.h"
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#include "core/arm/arm_interface.h"
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#include "core/gdbstub/gdbstub.h"
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class ARM_Unicorn final : public ARM_Interface {
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public:
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@ -35,7 +36,10 @@ public:
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void Step() override;
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void ClearInstructionCache() override;
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void PageTableChanged() override{};
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void RecordBreak(GDBStub::BreakpointAddress bkpt);
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private:
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uc_engine* uc{};
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GDBStub::BreakpointAddress last_bkpt{};
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bool last_bkpt_hit;
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};
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@ -32,9 +32,13 @@
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#include "common/logging/log.h"
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#include "common/string_util.h"
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#include "common/swap.h"
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#include "core/arm/arm_interface.h"
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#include "core/core.h"
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#include "core/core_cpu.h"
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#include "core/gdbstub/gdbstub.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/scheduler.h"
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#include "core/loader/loader.h"
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#include "core/memory.h"
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@ -137,15 +141,17 @@ static u8 command_buffer[GDB_BUFFER_SIZE];
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static u32 command_length;
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static u32 latest_signal = 0;
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static bool step_break = false;
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static bool memory_break = false;
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static Kernel::Thread* current_thread = nullptr;
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// Binding to a port within the reserved ports range (0-1023) requires root permissions,
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// so default to a port outside of that range.
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static u16 gdbstub_port = 24689;
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static bool halt_loop = true;
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static bool step_loop = false;
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static bool send_trap = false;
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// If set to false, the server will never be started and no
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// gdbstub-related functions will be executed.
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@ -165,6 +171,53 @@ static std::map<u64, Breakpoint> breakpoints_execute;
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static std::map<u64, Breakpoint> breakpoints_read;
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static std::map<u64, Breakpoint> breakpoints_write;
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static Kernel::Thread* FindThreadById(int id) {
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for (int core = 0; core < Core::NUM_CPU_CORES; core++) {
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auto threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
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for (auto thread : threads) {
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if (thread->GetThreadId() == id) {
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current_thread = thread.get();
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return current_thread;
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}
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}
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}
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return nullptr;
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}
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static u64 RegRead(int id, Kernel::Thread* thread = nullptr) {
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if (!thread) {
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return 0;
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}
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if (id < SP_REGISTER) {
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return thread->context.cpu_registers[id];
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} else if (id == SP_REGISTER) {
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return thread->context.sp;
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} else if (id == PC_REGISTER) {
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return thread->context.pc;
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} else if (id == CPSR_REGISTER) {
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return thread->context.cpsr;
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} else {
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return 0;
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}
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}
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static void RegWrite(int id, u64 val, Kernel::Thread* thread = nullptr) {
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if (!thread) {
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return;
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}
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if (id < SP_REGISTER) {
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thread->context.cpu_registers[id] = val;
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} else if (id == SP_REGISTER) {
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thread->context.sp = val;
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} else if (id == PC_REGISTER) {
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thread->context.pc = val;
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} else if (id == CPSR_REGISTER) {
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thread->context.cpsr = val;
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}
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}
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/**
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* Turns hex string character into the equivalent byte.
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*
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@ -193,7 +246,7 @@ static u8 NibbleToHex(u8 n) {
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if (n < 0xA) {
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return '0' + n;
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} else {
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return 'A' + n - 0xA;
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return 'a' + n - 0xA;
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}
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}
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@ -439,6 +492,8 @@ static void SendReply(const char* reply) {
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return;
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}
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NGLOG_DEBUG(Debug_GDBStub, "Reply: {}", reply);
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memset(command_buffer, 0, sizeof(command_buffer));
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command_length = static_cast<u32>(strlen(reply));
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@ -483,6 +538,22 @@ static void HandleQuery() {
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} else if (strncmp(query, "Xfer:features:read:target.xml:",
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strlen("Xfer:features:read:target.xml:")) == 0) {
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SendReply(target_xml);
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} else if (strncmp(query, "Offsets", strlen("Offsets")) == 0) {
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std::string buffer = fmt::format("TextSeg={:0x}", Memory::PROCESS_IMAGE_VADDR);
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SendReply(buffer.c_str());
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} else if (strncmp(query, "fThreadInfo", strlen("fThreadInfo")) == 0) {
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std::string val = "m";
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for (int core = 0; core < Core::NUM_CPU_CORES; core++) {
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auto threads = Core::System::GetInstance().Scheduler(core)->GetThreadList();
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for (auto thread : threads) {
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val += fmt::format("{:x}", thread->GetThreadId());
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val += ",";
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}
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}
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val.pop_back();
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SendReply(val.c_str());
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} else if (strncmp(query, "sThreadInfo", strlen("sThreadInfo")) == 0) {
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SendReply("l");
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} else {
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SendReply("");
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}
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@ -490,11 +561,40 @@ static void HandleQuery() {
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/// Handle set thread command from gdb client.
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static void HandleSetThread() {
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if (memcmp(command_buffer, "Hg0", 3) == 0 || memcmp(command_buffer, "Hc-1", 4) == 0 ||
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memcmp(command_buffer, "Hc0", 4) == 0 || memcmp(command_buffer, "Hc1", 4) == 0) {
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return SendReply("OK");
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if (memcmp(command_buffer, "Hc", 2) == 0 || memcmp(command_buffer, "Hg", 2) == 0) {
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int thread_id = -1;
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if (command_buffer[2] != '-') {
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thread_id = static_cast<int>(HexToInt(
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command_buffer + 2,
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command_length - 2 /*strlen(reinterpret_cast<char*>(command_buffer) + 2)*/));
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}
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if (thread_id >= 1) {
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current_thread = FindThreadById(thread_id);
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}
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if (!current_thread) {
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thread_id = 1;
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current_thread = FindThreadById(thread_id);
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}
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if (current_thread) {
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SendReply("OK");
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return;
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}
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}
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SendReply("E01");
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}
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/// Handle thread alive command from gdb client.
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static void HandleThreadAlive() {
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int thread_id = static_cast<int>(
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HexToInt(command_buffer + 1,
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command_length - 1 /*strlen(reinterpret_cast<char*>(command_buffer) + 1)*/));
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if (thread_id == 0) {
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thread_id = 1;
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}
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if (FindThreadById(thread_id)) {
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SendReply("OK");
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return;
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}
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SendReply("E01");
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}
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@ -503,15 +603,24 @@ static void HandleSetThread() {
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*
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* @param signal Signal to be sent to client.
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*/
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static void SendSignal(u32 signal) {
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static void SendSignal(Kernel::Thread* thread, u32 signal, bool full = true) {
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if (gdbserver_socket == -1) {
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return;
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}
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latest_signal = signal;
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std::string buffer = fmt::format("T{:02x}", latest_signal);
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NGLOG_DEBUG(Debug_GDBStub, "Response: {}", buffer);
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std::string buffer;
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if (full) {
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buffer = fmt::format("T{:02x}{:02x}:{:016x};{:02x}:{:016x};", latest_signal, PC_REGISTER,
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Common::swap64(RegRead(PC_REGISTER, thread)), SP_REGISTER,
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Common::swap64(RegRead(SP_REGISTER, thread)));
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} else {
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buffer = fmt::format("T{:02x};", latest_signal);
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}
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buffer += fmt::format("thread:{:x};", thread->GetThreadId());
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SendReply(buffer.c_str());
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}
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@ -527,7 +636,7 @@ static void ReadCommand() {
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} else if (c == 0x03) {
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NGLOG_INFO(Debug_GDBStub, "gdb: found break command");
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halt_loop = true;
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SendSignal(SIGTRAP);
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SendSignal(current_thread, SIGTRAP);
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return;
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} else if (c != GDB_STUB_START) {
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NGLOG_DEBUG(Debug_GDBStub, "gdb: read invalid byte {:02X}", c);
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@ -598,11 +707,11 @@ static void ReadRegister() {
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}
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if (id <= SP_REGISTER) {
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LongToGdbHex(reply, Core::CurrentArmInterface().GetReg(static_cast<int>(id)));
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LongToGdbHex(reply, RegRead(id, current_thread));
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} else if (id == PC_REGISTER) {
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LongToGdbHex(reply, Core::CurrentArmInterface().GetPC());
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LongToGdbHex(reply, RegRead(id, current_thread));
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} else if (id == CPSR_REGISTER) {
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IntToGdbHex(reply, Core::CurrentArmInterface().GetCPSR());
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IntToGdbHex(reply, (u32)RegRead(id, current_thread));
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} else {
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return SendReply("E01");
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}
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@ -618,16 +727,16 @@ static void ReadRegisters() {
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u8* bufptr = buffer;
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for (int reg = 0; reg <= SP_REGISTER; reg++) {
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LongToGdbHex(bufptr + reg * 16, Core::CurrentArmInterface().GetReg(reg));
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LongToGdbHex(bufptr + reg * 16, RegRead(reg, current_thread));
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}
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bufptr += (32 * 16);
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LongToGdbHex(bufptr, Core::CurrentArmInterface().GetPC());
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LongToGdbHex(bufptr, RegRead(PC_REGISTER, current_thread));
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bufptr += 16;
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IntToGdbHex(bufptr, Core::CurrentArmInterface().GetCPSR());
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IntToGdbHex(bufptr, (u32)RegRead(CPSR_REGISTER, current_thread));
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bufptr += 8;
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@ -646,11 +755,11 @@ static void WriteRegister() {
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}
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if (id <= SP_REGISTER) {
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Core::CurrentArmInterface().SetReg(id, GdbHexToLong(buffer_ptr));
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RegWrite(id, GdbHexToLong(buffer_ptr), current_thread);
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} else if (id == PC_REGISTER) {
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Core::CurrentArmInterface().SetPC(GdbHexToLong(buffer_ptr));
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RegWrite(id, GdbHexToLong(buffer_ptr), current_thread);
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} else if (id == CPSR_REGISTER) {
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Core::CurrentArmInterface().SetCPSR(GdbHexToInt(buffer_ptr));
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RegWrite(id, GdbHexToInt(buffer_ptr), current_thread);
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} else {
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return SendReply("E01");
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}
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@ -667,11 +776,11 @@ static void WriteRegisters() {
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for (int i = 0, reg = 0; reg <= CPSR_REGISTER; i++, reg++) {
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if (reg <= SP_REGISTER) {
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Core::CurrentArmInterface().SetReg(reg, GdbHexToLong(buffer_ptr + i * 16));
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RegWrite(reg, GdbHexToLong(buffer_ptr + i * 16), current_thread);
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} else if (reg == PC_REGISTER) {
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Core::CurrentArmInterface().SetPC(GdbHexToLong(buffer_ptr + i * 16));
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RegWrite(PC_REGISTER, GdbHexToLong(buffer_ptr + i * 16), current_thread);
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} else if (reg == CPSR_REGISTER) {
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Core::CurrentArmInterface().SetCPSR(GdbHexToInt(buffer_ptr + i * 16));
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RegWrite(CPSR_REGISTER, GdbHexToInt(buffer_ptr + i * 16), current_thread);
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} else {
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UNIMPLEMENTED();
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}
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@ -734,7 +843,7 @@ static void WriteMemory() {
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void Break(bool is_memory_break) {
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if (!halt_loop) {
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halt_loop = true;
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SendSignal(SIGTRAP);
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send_trap = true;
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}
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memory_break = is_memory_break;
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@ -744,10 +853,10 @@ void Break(bool is_memory_break) {
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static void Step() {
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step_loop = true;
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halt_loop = true;
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step_break = true;
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SendSignal(SIGTRAP);
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send_trap = true;
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}
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/// Tell the CPU if we hit a memory breakpoint.
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bool IsMemoryBreak() {
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if (IsConnected()) {
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return false;
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@ -759,7 +868,6 @@ bool IsMemoryBreak() {
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/// Tell the CPU to continue executing.
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static void Continue() {
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memory_break = false;
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step_break = false;
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step_loop = false;
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halt_loop = false;
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}
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@ -898,7 +1006,7 @@ void HandlePacket() {
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HandleSetThread();
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break;
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case '?':
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SendSignal(latest_signal);
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SendSignal(current_thread, latest_signal);
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break;
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case 'k':
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Shutdown();
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@ -935,6 +1043,9 @@ void HandlePacket() {
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case 'Z':
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AddBreakpoint();
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break;
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case 'T':
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HandleThreadAlive();
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break;
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default:
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SendReply("");
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break;
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@ -1079,4 +1190,11 @@ bool GetCpuStepFlag() {
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void SetCpuStepFlag(bool is_step) {
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step_loop = is_step;
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}
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void SendTrap(Kernel::Thread* thread, int trap) {
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if (send_trap) {
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send_trap = false;
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SendSignal(thread, trap);
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}
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}
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}; // namespace GDBStub
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@ -7,6 +7,7 @@
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#pragma once
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#include "common/common_types.h"
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#include "core/hle/kernel/thread.h"
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namespace GDBStub {
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@ -91,4 +92,12 @@ bool GetCpuStepFlag();
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* @param is_step
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*/
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void SetCpuStepFlag(bool is_step);
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/**
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* Send trap signal from thread back to the gdbstub server.
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*
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* @param thread Sending thread.
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* @param trap Trap no.
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*/
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void SendTrap(Kernel::Thread* thread, int trap);
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} // namespace GDBStub
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