From 31dee93e849d79a91f280faf16941806e3cb3c6b Mon Sep 17 00:00:00 2001
From: polaris- <nagatospam@gmail.com>
Date: Wed, 2 Sep 2015 08:56:38 -0400
Subject: Implement gdbstub
---
src/core/gdbstub/gdbstub.cpp | 940 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 940 insertions(+)
create mode 100644 src/core/gdbstub/gdbstub.cpp
(limited to 'src/core/gdbstub/gdbstub.cpp')
diff --git a/src/core/gdbstub/gdbstub.cpp b/src/core/gdbstub/gdbstub.cpp
new file mode 100644
index 0000000000..ced1c54f56
--- /dev/null
+++ b/src/core/gdbstub/gdbstub.cpp
@@ -0,0 +1,940 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+// Originally written by Sven Peter <sven@fail0verflow.com> for anergistic.
+
+#include <csignal>
+#include <cstdarg>
+#include <cstdio>
+#include <cstring>
+#include <fcntl.h>
+#include <map>
+#include <numeric>
+
+#ifdef _MSC_VER
+#include <WinSock2.h>
+#include <ws2tcpip.h>
+#include <common/x64/abi.h>
+#include <io.h>
+#include <iphlpapi.h>
+#define SHUT_RDWR 2
+#else
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#endif
+
+#include "common/logging/log.h"
+#include "common/string_util.h"
+#include <core/arm/arm_interface.h>
+#include "core/core.h"
+#include "core/memory.h"
+#include "gdbstub.h"
+
+const int GDB_BUFFER_SIZE = 10000;
+
+const char GDB_STUB_START = '$';
+const char GDB_STUB_END = '#';
+const char GDB_STUB_ACK = '+';
+const char GDB_STUB_NACK = '-';
+
+#ifndef SIGTRAP
+const u32 SIGTRAP = 5;
+#endif
+
+#ifndef SIGTERM
+const u32 SIGTERM = 15;
+#endif
+
+#ifndef MSG_WAITALL
+const u32 MSG_WAITALL = 8;
+#endif
+
+const u32 R0_REGISTER = 0;
+const u32 R15_REGISTER = 15;
+const u32 CSPR_REGISTER = 25;
+
+namespace GDBStub {
+
+static int gdbserver_socket = -1;
+
+static u8 command_buffer[GDB_BUFFER_SIZE];
+static u32 command_length;
+
+static u32 latest_signal = 0;
+static u32 send_signal = 0;
+static u32 step_break = 0;
+static bool memory_break = false;
+
+// Binding to a port within the reserved ports range (0-1023) requires root permissions,
+// so default to a port outside of that range.
+static u16 gdbstub_port = 24689;
+
+static bool halt_loop = true;
+static bool step_loop = false;
+std::atomic<bool> g_server_enabled(false);
+
+#ifdef _WIN32
+WSADATA InitData;
+#endif
+
+struct Breakpoint {
+ bool active;
+ PAddr addr;
+ u32 len;
+};
+
+static std::map<u32, Breakpoint> breakpoints_execute;
+static std::map<u32, Breakpoint> breakpoints_read;
+static std::map<u32, Breakpoint> breakpoints_write;
+
+/**
+ * Turns hex string character into the equivalent byte.
+ *
+ * @param hex Input hex character to be turned into byte.
+ */
+static u8 HexCharToValue(u8 hex) {
+ if (hex >= '0' && hex <= '9') {
+ return hex - '0';
+ } else if (hex >= 'a' && hex <= 'f') {
+ return hex - 'a' + 0xA;
+ } else if (hex >= 'A' && hex <= 'F') {
+ return hex - 'A' + 0xA;
+ }
+
+ LOG_ERROR(Debug_GDBStub, "Invalid nibble: %c (%02x)\n", hex, hex);
+ return 0;
+}
+
+/**
+ * Turn nibble of byte into hex string character.
+ *
+ * @param n Nibble to be turned into hex character.
+ */
+static u8 NibbleToHex(u8 n) {
+ n &= 0xF;
+ if (n < 0xA) {
+ return '0' + n;
+ } else {
+ return 'A' + n - 0xA;
+ }
+}
+
+/**
+ * Converts input array of u8 bytes into their equivalent hex string characters.
+ *
+ * @param dest Pointer to buffer to store output hex string characters.
+ * @param src Pointer to array of u8 bytes.
+ * @param len Length of src array.
+ */
+static void MemToHex(u8* dest, u8* src, u32 len) {
+ while (len-- > 0) {
+ u8 tmp = *src++;
+ *dest++ = NibbleToHex(tmp >> 4);
+ *dest++ = NibbleToHex(tmp);
+ }
+}
+
+/**
+ * Converts input hex string characters into an array of equivalent of u8 bytes.
+ *
+ * @param dest Pointer to buffer to store u8 bytes.
+ * @param src Pointer to array of output hex string characters.
+ * @param len Length of src array.
+ */
+static void HexToMem(u8* dest, u8* src, u32 len) {
+ while (len-- > 0) {
+ *dest++ = (HexCharToValue(src[0]) << 4) | HexCharToValue(src[1]);
+ src += 2;
+ }
+}
+
+/**
+ * Convert a u32 into a hex string.
+ *
+ * @param dest Pointer to buffer to store output hex string characters.
+ */
+static void IntToHex(u8* dest, u32 v) {
+ for (int i = 0; i < 8; i += 2) {
+ dest[i + 1] = NibbleToHex(v >> (4 * i));
+ dest[i] = NibbleToHex(v >> (4 * (i + 1)));
+ }
+}
+
+/**
+ * Convert a hex string into a u32.
+ *
+ * @param src Pointer to hex string.
+ */
+static u32 HexToInt(u8* src) {
+ u32 output = 0;
+
+ for (int i = 0; i < 8; i += 2) {
+ output = (output << 4) | HexCharToValue(src[7 - i - 1]);
+ output = (output << 4) | HexCharToValue(src[7 - i]);
+ }
+
+ return output;
+}
+
+/// Read a byte from the gdb client.
+static u8 ReadByte() {
+ u8 c;
+ size_t received_size = recv(gdbserver_socket, reinterpret_cast<char*>(&c), 1, MSG_WAITALL);
+ if (received_size != 1) {
+ LOG_ERROR(Debug_GDBStub, "recv failed : %ld", received_size);
+ Deinit();
+ }
+
+ return c;
+}
+
+/// Calculate the checksum of the current command buffer.
+static u8 CalculateChecksum(u8 *buffer, u32 length) {
+ return static_cast<u8>(std::accumulate(buffer, buffer + length, 0, std::plus<u8>()));
+}
+
+/**
+ * Get the list of breakpoints for a given breakpoint type.
+ *
+ * @param type Type of breakpoint list.
+ */
+static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) {
+ switch (type) {
+ case BreakpointType::Execute:
+ return breakpoints_execute;
+ case BreakpointType::Read:
+ return breakpoints_read;
+ case BreakpointType::Write:
+ return breakpoints_write;
+ default:
+ return breakpoints_read;
+ }
+}
+
+/**
+ * Remove the breakpoint from the given address of the specified type.
+ *
+ * @param type Type of breakpoint.
+ * @param addr Address of breakpoint.
+ */
+static void RemoveBreakpoint(BreakpointType type, PAddr addr) {
+ std::map<u32, Breakpoint>& p = GetBreakpointList(type);
+
+ auto bp = p.find(addr);
+ if (bp != p.end()) {
+ LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: %08x bytes at %08x of type %d\n", bp->second.len, bp->second.addr, type);
+ p.erase(addr);
+ }
+}
+
+PAddr GetNextBreakpointFromAddress(PAddr addr, BreakpointType type) {
+ std::map<u32, Breakpoint>& p = GetBreakpointList(type);
+ auto next_breakpoint = p.lower_bound(addr);
+ u32 breakpoint = -1;
+
+ if (next_breakpoint != p.end())
+ breakpoint = next_breakpoint->first;
+
+ return breakpoint;
+}
+
+bool CheckBreakpoint(PAddr addr, BreakpointType type) {
+ if (!IsConnected()) {
+ return false;
+ }
+
+ std::map<u32, Breakpoint>& p = GetBreakpointList(type);
+
+ auto bp = p.find(addr);
+ if (bp != p.end()) {
+ u32 len = bp->second.len;
+
+ // IDA Pro defaults to 4-byte breakpoints for all non-hardware breakpoints
+ // no matter if it's a 4-byte or 2-byte instruction. When you execute a
+ // Thumb instruction with a 4-byte breakpoint set, it will set a breakpoint on
+ // two instructions instead of the single instruction you placed the breakpoint
+ // on. So, as a way to make sure that execution breakpoints are only breaking
+ // on the instruction that was specified, set the length of an execution
+ // breakpoint to 1. This should be fine since the CPU should never begin executing
+ // an instruction anywhere except the beginning of the instruction.
+ if (type == BreakpointType::Execute) {
+ len = 1;
+ }
+
+ if (bp->second.active && (addr >= bp->second.addr && addr < bp->second.addr + len)) {
+ LOG_DEBUG(Debug_GDBStub, "Found breakpoint type %d @ %08x, range: %08x - %08x (%d bytes)\n", type, addr, bp->second.addr, bp->second.addr + len, len);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/**
+ * Send packet to gdb client.
+ *
+ * @param packet Packet to be sent to client.
+ */
+static void SendPacket(const char packet) {
+ size_t sent_size = send(gdbserver_socket, &packet, 1, 0);
+ if (sent_size != 1) {
+ LOG_ERROR(Debug_GDBStub, "send failed");
+ }
+}
+
+/**
+ * Send reply to gdb client.
+ *
+ * @param reply Reply to be sent to client.
+ */
+static void SendReply(const char* reply) {
+ if (!IsConnected()) {
+ return;
+ }
+
+ memset(command_buffer, 0, sizeof(command_buffer));
+
+ command_length = strlen(reply);
+ if (command_length + 4 > sizeof(command_buffer)) {
+ LOG_ERROR(Debug_GDBStub, "command_buffer overflow in SendReply");
+ }
+
+ memcpy(command_buffer + 1, reply, command_length);
+
+ u8 checksum = CalculateChecksum(command_buffer, command_length + 1);
+ command_buffer[0] = GDB_STUB_START;
+ command_buffer[command_length + 1] = GDB_STUB_END;
+ command_buffer[command_length + 2] = NibbleToHex(checksum >> 4);
+ command_buffer[command_length + 3] = NibbleToHex(checksum);
+
+ u8* ptr = command_buffer;
+ u32 left = command_length + 4;
+ while (left > 0) {
+ int sent_size = send(gdbserver_socket, reinterpret_cast<char*>(ptr), left, 0);
+ if (sent_size < 0) {
+ LOG_ERROR(Debug_GDBStub, "gdb: send failed");
+ return Deinit();
+ }
+
+ left -= sent_size;
+ ptr += sent_size;
+ }
+}
+
+/// Handle query command from gdb client.
+static void HandleQuery() {
+ LOG_DEBUG(Debug_GDBStub, "gdb: query '%s'\n", command_buffer + 1);
+
+ if (!strcmp(reinterpret_cast<const char*>(command_buffer + 1), "TStatus")) {
+ SendReply("T0");
+ } else {
+ SendReply("");
+ }
+}
+
+/// Handle set thread command from gdb client.
+static void HandleSetThread() {
+ if (memcmp(command_buffer, "Hg0", 3) == 0 ||
+ memcmp(command_buffer, "Hc-1", 4) == 0 ||
+ memcmp(command_buffer, "Hc0", 4) == 0 ||
+ memcmp(command_buffer, "Hc1", 4) == 0) {
+ return SendReply("OK");
+ }
+
+ SendReply("E01");
+}
+
+/// Create and send signal packet.
+static void HandleSignal() {
+ std::string buffer = Common::StringFromFormat("T%02x%02x:%08x;%02x:%08x;", latest_signal, 15, htonl(Core::g_app_core->GetPC()), 13, htonl(Core::g_app_core->GetReg(13)));
+
+ LOG_DEBUG(Debug_GDBStub, "Response: %s", buffer.c_str());
+
+ SendReply(buffer.c_str());
+}
+
+/**
+ * Set signal and send packet to client through HandleSignal if signal flag is set using SendSignal.
+ *
+ * @param signal Signal to be sent to client.
+ */
+int SendSignal(u32 signal) {
+ if (gdbserver_socket == -1) {
+ return 1;
+ }
+
+ latest_signal = signal;
+
+ if (send_signal) {
+ HandleSignal();
+ send_signal = 0;
+ }
+
+ return 0;
+}
+
+/// Read command from gdb client.
+static void ReadCommand() {
+ command_length = 0;
+ memset(command_buffer, 0, sizeof(command_buffer));
+
+ u8 c = ReadByte();
+ if (c == '+') {
+ //ignore ack
+ return;
+ } else if (c == 0x03) {
+ LOG_INFO(Debug_GDBStub, "gdb: found break command\n");
+ halt_loop = true;
+ send_signal = 1;
+ SendSignal(SIGTRAP);
+ return;
+ } else if (c != GDB_STUB_START) {
+ LOG_DEBUG(Debug_GDBStub, "gdb: read invalid byte %02x\n", c);
+ return;
+ }
+
+ while ((c = ReadByte()) != GDB_STUB_END) {
+ command_buffer[command_length++] = c;
+ if (command_length == sizeof(command_buffer)) {
+ LOG_ERROR(Debug_GDBStub, "gdb: command_buffer overflow\n");
+ SendPacket(GDB_STUB_NACK);
+ return;
+ }
+ }
+
+ u8 checksum_received = HexCharToValue(ReadByte()) << 4;
+ checksum_received |= HexCharToValue(ReadByte());
+
+ u8 checksum_calculated = CalculateChecksum(command_buffer, command_length);
+
+ if (checksum_received != checksum_calculated) {
+ LOG_ERROR(Debug_GDBStub, "gdb: invalid checksum: calculated %02x and read %02x for $%s# (length: %d)\n",
+ checksum_calculated, checksum_received, command_buffer, command_length);
+
+ command_length = 0;
+
+ SendPacket(GDB_STUB_NACK);
+ return;
+ }
+
+ SendPacket(GDB_STUB_ACK);
+}
+
+/// Check if there is data to be read from the gdb client.
+static bool IsDataAvailable() {
+ if (!IsConnected()) {
+ return false;
+ }
+
+ fd_set fd_socket;
+
+ FD_ZERO(&fd_socket);
+ FD_SET(gdbserver_socket, &fd_socket);
+
+ struct timeval t;
+ t.tv_sec = 0;
+ t.tv_usec = 0;
+
+ if (select(gdbserver_socket + 1, &fd_socket, nullptr, nullptr, &t) < 0) {
+ LOG_ERROR(Debug_GDBStub, "select failed");
+ return false;
+ }
+
+ return FD_ISSET(gdbserver_socket, &fd_socket);
+}
+
+/// Send requested register to gdb client.
+static void ReadRegister() {
+ static u8 reply[64];
+ memset(reply, 0, sizeof(reply));
+
+ u32 id = HexCharToValue(command_buffer[1]);
+ if (command_buffer[2] != '\0') {
+ id <<= 4;
+ id |= HexCharToValue(command_buffer[2]);
+ }
+
+ if (id >= R0_REGISTER && id <= R15_REGISTER) {
+ IntToHex(reply, Core::g_app_core->GetReg(id));
+ } else if (id == CSPR_REGISTER) {
+ IntToHex(reply, Core::g_app_core->GetCPSR());
+ } else {
+ return SendReply("E01");
+ }
+
+ SendReply(reinterpret_cast<char*>(reply));
+}
+
+/// Send all registers to the gdb client.
+static void ReadRegisters() {
+ static u8 buffer[GDB_BUFFER_SIZE - 4];
+ memset(buffer, 0, sizeof(buffer));
+
+ u8* bufptr = buffer;
+ for (int i = 0; i <= CSPR_REGISTER; i++) {
+ if (i <= R15_REGISTER) {
+ IntToHex(bufptr + i * 8, Core::g_app_core->GetReg(i));
+ } else if (i == CSPR_REGISTER) {
+ IntToHex(bufptr + i * 8, Core::g_app_core->GetCPSR());
+ } else {
+ IntToHex(bufptr + i * 8, 0);
+ IntToHex(bufptr + (i + 1) * 8, 0);
+ i++; // These registers seem to be all 64bit instead of 32bit, so skip two instead of one
+ }
+ }
+
+ SendReply(reinterpret_cast<char*>(buffer));
+}
+
+/// Modify data of register specified by gdb client.
+static void WriteRegister() {
+ u8* buffer_ptr = command_buffer + 3;
+
+ u32 id = HexCharToValue(command_buffer[1]);
+ if (command_buffer[2] != '=') {
+ ++buffer_ptr;
+ id <<= 4;
+ id |= HexCharToValue(command_buffer[2]);
+ }
+
+ if (id >= R0_REGISTER && id <= R15_REGISTER) {
+ Core::g_app_core->SetReg(id, HexToInt(buffer_ptr));
+ } else if (id == CSPR_REGISTER) {
+ Core::g_app_core->SetCPSR(HexToInt(buffer_ptr));
+ } else {
+ return SendReply("E01");
+ }
+
+ SendReply("OK");
+}
+
+/// Modify all registers with data received from the client.
+static void WriteRegisters() {
+ u8* buffer_ptr = command_buffer + 1;
+
+ if (command_buffer[0] != 'G')
+ return SendReply("E01");
+
+ for (int i = 0; i <= CSPR_REGISTER; i++) {
+ if (i <= R15_REGISTER) {
+ Core::g_app_core->SetReg(i, HexToInt(buffer_ptr + i * 8));
+ } else if (i == CSPR_REGISTER) {
+ Core::g_app_core->SetCPSR(HexToInt(buffer_ptr + i * 8));
+ } else {
+ i++; // These registers seem to be all 64bit instead of 32bit, so skip two instead of one
+ }
+ }
+
+ SendReply("OK");
+}
+
+/// Read location in memory specified by gdb client.
+static void ReadMemory() {
+ static u8 reply[GDB_BUFFER_SIZE - 4];
+
+ int i = 1;
+ PAddr addr = 0;
+ while (command_buffer[i] != ',') {
+ addr = (addr << 4) | HexCharToValue(command_buffer[i++]);
+ }
+ i++;
+
+ u32 len = 0;
+ while (i < command_length) {
+ len = (len << 4) | HexCharToValue(command_buffer[i++]);
+ }
+
+ if (len * 2 > sizeof(reply)) {
+ SendReply("E01");
+ }
+
+ u8* data = Memory::GetPointer(addr);
+ if (!data) {
+ return SendReply("E0");
+ }
+
+ MemToHex(reply, data, len);
+ reply[len * 2] = '\0';
+ SendReply(reinterpret_cast<char*>(reply));
+}
+
+/// Modify location in memory with data received from the gdb client.
+static void WriteMemory() {
+ int i = 1;
+ PAddr addr = 0;
+ while (command_buffer[i] != ',') {
+ addr = (addr << 4) | HexCharToValue(command_buffer[i++]);
+ }
+ i++;
+
+ u32 len = 0;
+ while (command_buffer[i] != ':') {
+ len = (len << 4) | HexCharToValue(command_buffer[i++]);
+ }
+
+ u8* dst = Memory::GetPointer(addr);
+ if (!dst) {
+ return SendReply("E00");
+ }
+
+ HexToMem(dst, command_buffer + i + 1, len);
+ SendReply("OK");
+}
+
+void Break(bool is_memory_break) {
+ if (!halt_loop) {
+ halt_loop = true;
+ send_signal = 1;
+ SendSignal(SIGTRAP);
+ }
+
+ memory_break = is_memory_break;
+}
+
+/// Tell the CPU that it should perform a single step.
+static void Step() {
+ step_loop = true;
+ halt_loop = true;
+ send_signal = 1;
+ step_break = 1;
+ SendSignal(SIGTRAP);
+}
+
+bool IsMemoryBreak() {
+ if (IsConnected()) {
+ return false;
+ }
+
+ return memory_break;
+}
+
+/// Tell the CPU to continue executing.
+static void Continue() {
+ memory_break = false;
+ step_break = 0;
+ step_loop = false;
+ halt_loop = false;
+}
+
+/**
+ * Commit breakpoint to list of breakpoints.
+ *
+ * @param type Type of breakpoint.
+ * @param addr Address of breakpoint.
+ * @param len Length of breakpoint.
+ */
+bool CommitBreakpoint(BreakpointType type, PAddr addr, u32 len) {
+ std::map<u32, Breakpoint>& p = GetBreakpointList(type);
+
+ Breakpoint breakpoint;
+ breakpoint.active = true;
+ breakpoint.addr = addr;
+ breakpoint.len = len;
+ p.insert({ addr, breakpoint });
+
+ LOG_DEBUG(Debug_GDBStub, "gdb: added %d breakpoint: %08x bytes at %08x\n", type, breakpoint.len, breakpoint.addr);
+
+ return true;
+}
+
+/// Handle add breakpoint command from gdb client.
+static void AddBreakpoint() {
+ BreakpointType type;
+
+ u8 type_id = HexCharToValue(command_buffer[1]);
+ switch (type_id) {
+ case 0:
+ case 1:
+ type = BreakpointType::Execute;
+ break;
+ case 2:
+ type = BreakpointType::Write;
+ break;
+ case 3:
+ type = BreakpointType::Read;
+ break;
+ case 4:
+ type = BreakpointType::Access;
+ break;
+ default:
+ return SendReply("E01");
+ }
+
+ int i = 3;
+ PAddr addr = 0;
+ while (command_buffer[i] != ',') {
+ addr = addr << 4 | HexCharToValue(command_buffer[i++]);
+ }
+ i++;
+
+ u32 len = 0;
+ while (i < command_length) {
+ len = len << 4 | HexCharToValue(command_buffer[i++]);
+ }
+
+ if (type == BreakpointType::Access) {
+ // Access is made up of Read and Write types, so add both breakpoints
+ type = BreakpointType::Read;
+
+ if (!CommitBreakpoint(type, addr, len)) {
+ return SendReply("E02");
+ }
+
+ type = BreakpointType::Write;
+ }
+
+ if (!CommitBreakpoint(type, addr, len)) {
+ return SendReply("E02");
+ }
+
+ SendReply("OK");
+}
+
+/// Handle remove breakpoint command from gdb client.
+static void RemoveBreakpoint() {
+ BreakpointType type;
+
+ u8 type_id = HexCharToValue(command_buffer[1]);
+ switch (type_id) {
+ case 0:
+ case 1:
+ type = BreakpointType::Execute;
+ break;
+ case 2:
+ type = BreakpointType::Write;
+ break;
+ case 3:
+ type = BreakpointType::Read;
+ break;
+ case 4:
+ type = BreakpointType::Access;
+ break;
+ default:
+ return SendReply("E01");
+ }
+
+ int i = 3;
+ PAddr addr = 0;
+ while (command_buffer[i] != ',') {
+ addr = (addr << 4) | HexCharToValue(command_buffer[i++]);
+ }
+ i++;
+
+ u32 len = 0;
+ while (i < command_length) {
+ len = (len << 4) | HexCharToValue(command_buffer[i++]);
+ }
+
+ if (type == BreakpointType::Access) {
+ // Access is made up of Read and Write types, so add both breakpoints
+ type = BreakpointType::Read;
+ RemoveBreakpoint(type, addr);
+
+ type = BreakpointType::Write;
+ }
+
+ RemoveBreakpoint(type, addr);
+ SendReply("OK");
+}
+
+void HandlePacket() {
+ if (!IsConnected()) {
+ return;
+ }
+
+ if (!IsDataAvailable()) {
+ return;
+ }
+
+ ReadCommand();
+ if (command_length == 0) {
+ return;
+ }
+
+ LOG_DEBUG(Debug_GDBStub, "Packet: %s", command_buffer);
+
+ switch (command_buffer[0]) {
+ case 'q':
+ HandleQuery();
+ break;
+ case 'H':
+ HandleSetThread();
+ break;
+ case '?':
+ HandleSignal();
+ break;
+ case 'k':
+ Deinit();
+ LOG_INFO(Debug_GDBStub, "killed by gdb");
+ return;
+ case 'g':
+ ReadRegisters();
+ break;
+ case 'G':
+ WriteRegisters();
+ break;
+ case 'p':
+ ReadRegister();
+ break;
+ case 'P':
+ WriteRegister();
+ break;
+ case 'm':
+ ReadMemory();
+ break;
+ case 'M':
+ WriteMemory();
+ break;
+ case 's':
+ Step();
+ return;
+ case 'C':
+ case 'c':
+ Continue();
+ return;
+ case 'z':
+ RemoveBreakpoint();
+ break;
+ case 'Z':
+ AddBreakpoint();
+ break;
+ default:
+ SendReply("");
+ break;
+ }
+}
+
+void SetServerPort(u16 port) {
+ gdbstub_port = port;
+}
+
+void ToggleServer(bool status) {
+ if (status) {
+ g_server_enabled = status;
+
+ // Start server
+ if (!IsConnected() && Core::g_sys_core != nullptr) {
+ Init();
+ }
+ }
+ else {
+ // Stop server
+ if (IsConnected()) {
+ Deinit();
+ }
+
+ g_server_enabled = status;
+ }
+}
+
+void Init(u16 port) {
+ if (!g_server_enabled) {
+ // Set the halt loop to false in case the user enabled the gdbstub mid-execution.
+ // This way the CPU can still execute normally.
+ halt_loop = false;
+ step_loop = false;
+ return;
+ }
+
+ // Setup initial gdbstub status
+ halt_loop = true;
+ step_loop = false;
+
+ breakpoints_execute.clear();
+ breakpoints_read.clear();
+ breakpoints_write.clear();
+
+ // Start gdb server
+ LOG_INFO(Debug_GDBStub, "Starting GDB server on port %d...", port);
+
+ sockaddr_in saddr_server = {};
+ saddr_server.sin_family = AF_INET;
+ saddr_server.sin_port = htons(port);
+ saddr_server.sin_addr.s_addr = INADDR_ANY;
+
+#ifdef _WIN32
+ WSAStartup(MAKEWORD(2, 2), &InitData);
+#endif
+
+ int tmpsock = socket(PF_INET, SOCK_STREAM, 0);
+ if (tmpsock == -1) {
+ LOG_ERROR(Debug_GDBStub, "Failed to create gdb socket");
+ }
+
+ const sockaddr* server_addr = reinterpret_cast<const sockaddr*>(&saddr_server);
+ socklen_t server_addrlen = sizeof(saddr_server);
+ if (bind(tmpsock, server_addr, server_addrlen) < 0) {
+ LOG_ERROR(Debug_GDBStub, "Failed to bind gdb socket");
+ }
+
+ if (listen(tmpsock, 1) < 0) {
+ LOG_ERROR(Debug_GDBStub, "Failed to listen to gdb socket");
+ }
+
+ // Wait for gdb to connect
+ LOG_INFO(Debug_GDBStub, "Waiting for gdb to connect...\n");
+ sockaddr_in saddr_client;
+ sockaddr* client_addr = reinterpret_cast<sockaddr*>(&saddr_client);
+ socklen_t client_addrlen = sizeof(saddr_client);
+ gdbserver_socket = accept(tmpsock, client_addr, &client_addrlen);
+ if (gdbserver_socket < 0) {
+ // In the case that we couldn't start the server for whatever reason, just start CPU execution like normal.
+ halt_loop = false;
+ step_loop = false;
+
+ LOG_ERROR(Debug_GDBStub, "Failed to accept gdb client");
+ }
+ else {
+ LOG_INFO(Debug_GDBStub, "Client connected.\n");
+ saddr_client.sin_addr.s_addr = ntohl(saddr_client.sin_addr.s_addr);
+ }
+
+ // Clean up temporary socket if it's still alive at this point.
+ if (tmpsock != -1) {
+ shutdown(tmpsock, SHUT_RDWR);
+ }
+}
+
+void Init() {
+ Init(gdbstub_port);
+}
+
+void Deinit() {
+ if (!g_server_enabled) {
+ return;
+ }
+
+ LOG_INFO(Debug_GDBStub, "Stopping GDB ...");
+ if (gdbserver_socket != -1) {
+ shutdown(gdbserver_socket, SHUT_RDWR);
+ gdbserver_socket = -1;
+ }
+
+#ifdef _WIN32
+ WSACleanup();
+#endif
+
+ LOG_INFO(Debug_GDBStub, "GDB stopped.");
+}
+
+bool IsConnected() {
+ return g_server_enabled && gdbserver_socket != -1;
+}
+
+bool GetCpuHaltFlag() {
+ return halt_loop;
+}
+
+bool GetCpuStepFlag() {
+ return step_loop;
+}
+
+void SetCpuStepFlag(bool is_step) {
+ step_loop = is_step;
+}
+
+};
--
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