Implement gdbstub
polaris-
parent
f7b4f44adf
commit
5114d75647
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// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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// Originally written by Sven Peter <sven@fail0verflow.com> for anergistic.
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#include <csignal>
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#include <cstdarg>
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#include <cstdio>
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#include <cstring>
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#include <fcntl.h>
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#include <map>
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#include <numeric>
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#ifdef _MSC_VER
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#include <WinSock2.h>
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#include <ws2tcpip.h>
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#include <common/x64/abi.h>
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#include <io.h>
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#include <iphlpapi.h>
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#define SHUT_RDWR 2
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#else
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#endif
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#include "common/logging/log.h"
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#include "common/string_util.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/memory.h"
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#include "gdbstub.h"
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const int GDB_BUFFER_SIZE = 10000;
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const char GDB_STUB_START = '$';
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const char GDB_STUB_END = '#';
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const char GDB_STUB_ACK = '+';
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const char GDB_STUB_NACK = '-';
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#ifndef SIGTRAP
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const u32 SIGTRAP = 5;
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#endif
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#ifndef SIGTERM
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const u32 SIGTERM = 15;
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#endif
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#ifndef MSG_WAITALL
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const u32 MSG_WAITALL = 8;
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#endif
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const u32 R0_REGISTER = 0;
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const u32 R15_REGISTER = 15;
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const u32 CSPR_REGISTER = 25;
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namespace GDBStub {
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static int gdbserver_socket = -1;
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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 u32 send_signal = 0;
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static u32 step_break = 0;
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static bool memory_break = false;
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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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std::atomic<bool> g_server_enabled(false);
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#ifdef _WIN32
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WSADATA InitData;
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#endif
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struct Breakpoint {
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bool active;
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PAddr addr;
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u32 len;
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};
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static std::map<u32, Breakpoint> breakpoints_execute;
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static std::map<u32, Breakpoint> breakpoints_read;
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static std::map<u32, Breakpoint> breakpoints_write;
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/**
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* Turns hex string character into the equivalent byte.
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*
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* @param hex Input hex character to be turned into byte.
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*/
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static u8 HexCharToValue(u8 hex) {
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if (hex >= '0' && hex <= '9') {
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return hex - '0';
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} else if (hex >= 'a' && hex <= 'f') {
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return hex - 'a' + 0xA;
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} else if (hex >= 'A' && hex <= 'F') {
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return hex - 'A' + 0xA;
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}
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LOG_ERROR(Debug_GDBStub, "Invalid nibble: %c (%02x)\n", hex, hex);
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return 0;
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}
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/**
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* Turn nibble of byte into hex string character.
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*
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* @param n Nibble to be turned into hex character.
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*/
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static u8 NibbleToHex(u8 n) {
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n &= 0xF;
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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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}
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}
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/**
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* Converts input array of u8 bytes into their equivalent hex string characters.
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*
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* @param dest Pointer to buffer to store output hex string characters.
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* @param src Pointer to array of u8 bytes.
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* @param len Length of src array.
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*/
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static void MemToHex(u8* dest, u8* src, u32 len) {
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while (len-- > 0) {
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u8 tmp = *src++;
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*dest++ = NibbleToHex(tmp >> 4);
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*dest++ = NibbleToHex(tmp);
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}
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}
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/**
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* Converts input hex string characters into an array of equivalent of u8 bytes.
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*
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* @param dest Pointer to buffer to store u8 bytes.
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* @param src Pointer to array of output hex string characters.
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* @param len Length of src array.
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*/
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static void HexToMem(u8* dest, u8* src, u32 len) {
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while (len-- > 0) {
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*dest++ = (HexCharToValue(src[0]) << 4) | HexCharToValue(src[1]);
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src += 2;
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}
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}
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/**
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* Convert a u32 into a hex string.
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*
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* @param dest Pointer to buffer to store output hex string characters.
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*/
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static void IntToHex(u8* dest, u32 v) {
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for (int i = 0; i < 8; i += 2) {
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dest[i + 1] = NibbleToHex(v >> (4 * i));
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dest[i] = NibbleToHex(v >> (4 * (i + 1)));
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}
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}
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/**
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* Convert a hex string into a u32.
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*
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* @param src Pointer to hex string.
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*/
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static u32 HexToInt(u8* src) {
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u32 output = 0;
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for (int i = 0; i < 8; i += 2) {
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output = (output << 4) | HexCharToValue(src[7 - i - 1]);
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output = (output << 4) | HexCharToValue(src[7 - i]);
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}
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return output;
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}
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/// Read a byte from the gdb client.
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static u8 ReadByte() {
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u8 c;
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size_t received_size = recv(gdbserver_socket, reinterpret_cast<char*>(&c), 1, MSG_WAITALL);
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if (received_size != 1) {
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LOG_ERROR(Debug_GDBStub, "recv failed : %ld", received_size);
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Deinit();
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}
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return c;
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}
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/// Calculate the checksum of the current command buffer.
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static u8 CalculateChecksum(u8 *buffer, u32 length) {
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return static_cast<u8>(std::accumulate(buffer, buffer + length, 0, std::plus<u8>()));
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}
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/**
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* Get the list of breakpoints for a given breakpoint type.
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*
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* @param type Type of breakpoint list.
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*/
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static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) {
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switch (type) {
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case BreakpointType::Execute:
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return breakpoints_execute;
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case BreakpointType::Read:
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return breakpoints_read;
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case BreakpointType::Write:
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return breakpoints_write;
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default:
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return breakpoints_read;
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}
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}
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/**
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* Remove the breakpoint from the given address of the specified type.
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*
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* @param type Type of breakpoint.
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* @param addr Address of breakpoint.
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*/
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static void RemoveBreakpoint(BreakpointType type, PAddr addr) {
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std::map<u32, Breakpoint>& p = GetBreakpointList(type);
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auto bp = p.find(addr);
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if (bp != p.end()) {
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LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: %08x bytes at %08x of type %d\n", bp->second.len, bp->second.addr, type);
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p.erase(addr);
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}
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}
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PAddr GetNextBreakpointFromAddress(PAddr addr, BreakpointType type) {
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std::map<u32, Breakpoint>& p = GetBreakpointList(type);
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auto next_breakpoint = p.lower_bound(addr);
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u32 breakpoint = -1;
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if (next_breakpoint != p.end())
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breakpoint = next_breakpoint->first;
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return breakpoint;
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}
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bool CheckBreakpoint(PAddr addr, BreakpointType type) {
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if (!IsConnected()) {
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return false;
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}
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std::map<u32, Breakpoint>& p = GetBreakpointList(type);
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auto bp = p.find(addr);
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if (bp != p.end()) {
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u32 len = bp->second.len;
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// IDA Pro defaults to 4-byte breakpoints for all non-hardware breakpoints
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// no matter if it's a 4-byte or 2-byte instruction. When you execute a
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// Thumb instruction with a 4-byte breakpoint set, it will set a breakpoint on
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// two instructions instead of the single instruction you placed the breakpoint
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// on. So, as a way to make sure that execution breakpoints are only breaking
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// on the instruction that was specified, set the length of an execution
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// breakpoint to 1. This should be fine since the CPU should never begin executing
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// an instruction anywhere except the beginning of the instruction.
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if (type == BreakpointType::Execute) {
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len = 1;
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}
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if (bp->second.active && (addr >= bp->second.addr && addr < bp->second.addr + len)) {
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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);
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return true;
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}
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}
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return false;
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}
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/**
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* Send packet to gdb client.
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*
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* @param packet Packet to be sent to client.
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*/
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static void SendPacket(const char packet) {
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size_t sent_size = send(gdbserver_socket, &packet, 1, 0);
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if (sent_size != 1) {
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LOG_ERROR(Debug_GDBStub, "send failed");
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}
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}
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/**
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* Send reply to gdb client.
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*
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* @param reply Reply to be sent to client.
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*/
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static void SendReply(const char* reply) {
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if (!IsConnected()) {
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return;
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}
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memset(command_buffer, 0, sizeof(command_buffer));
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command_length = strlen(reply);
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if (command_length + 4 > sizeof(command_buffer)) {
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LOG_ERROR(Debug_GDBStub, "command_buffer overflow in SendReply");
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}
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memcpy(command_buffer + 1, reply, command_length);
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u8 checksum = CalculateChecksum(command_buffer, command_length + 1);
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command_buffer[0] = GDB_STUB_START;
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command_buffer[command_length + 1] = GDB_STUB_END;
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command_buffer[command_length + 2] = NibbleToHex(checksum >> 4);
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command_buffer[command_length + 3] = NibbleToHex(checksum);
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u8* ptr = command_buffer;
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u32 left = command_length + 4;
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while (left > 0) {
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int sent_size = send(gdbserver_socket, reinterpret_cast<char*>(ptr), left, 0);
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if (sent_size < 0) {
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LOG_ERROR(Debug_GDBStub, "gdb: send failed");
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return Deinit();
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}
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left -= sent_size;
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ptr += sent_size;
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}
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}
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/// Handle query command from gdb client.
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static void HandleQuery() {
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LOG_DEBUG(Debug_GDBStub, "gdb: query '%s'\n", command_buffer + 1);
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if (!strcmp(reinterpret_cast<const char*>(command_buffer + 1), "TStatus")) {
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SendReply("T0");
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} else {
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SendReply("");
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}
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}
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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 ||
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memcmp(command_buffer, "Hc-1", 4) == 0 ||
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memcmp(command_buffer, "Hc0", 4) == 0 ||
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memcmp(command_buffer, "Hc1", 4) == 0) {
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return SendReply("OK");
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}
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SendReply("E01");
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}
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/// Create and send signal packet.
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static void HandleSignal() {
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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)));
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LOG_DEBUG(Debug_GDBStub, "Response: %s", buffer.c_str());
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SendReply(buffer.c_str());
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}
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/**
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* Set signal and send packet to client through HandleSignal if signal flag is set using SendSignal.
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*
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* @param signal Signal to be sent to client.
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*/
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int SendSignal(u32 signal) {
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if (gdbserver_socket == -1) {
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return 1;
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}
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latest_signal = signal;
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if (send_signal) {
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HandleSignal();
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send_signal = 0;
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}
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return 0;
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}
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/// Read command from gdb client.
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static void ReadCommand() {
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command_length = 0;
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memset(command_buffer, 0, sizeof(command_buffer));
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u8 c = ReadByte();
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if (c == '+') {
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//ignore ack
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return;
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} else if (c == 0x03) {
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LOG_INFO(Debug_GDBStub, "gdb: found break command\n");
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halt_loop = true;
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send_signal = 1;
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SendSignal(SIGTRAP);
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return;
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} else if (c != GDB_STUB_START) {
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LOG_DEBUG(Debug_GDBStub, "gdb: read invalid byte %02x\n", c);
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return;
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}
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while ((c = ReadByte()) != GDB_STUB_END) {
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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;
|
||||||
|
}
|
||||||
|
|
||||||
|
};
|
||||||
@ -0,0 +1,89 @@
|
|||||||
|
// 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.
|
||||||
|
|
||||||
|
#pragma once
|
||||||
|
#include <atomic>
|
||||||
|
|
||||||
|
namespace GDBStub {
|
||||||
|
|
||||||
|
/// Breakpoint Method
|
||||||
|
enum class BreakpointType {
|
||||||
|
None, ///< None
|
||||||
|
Execute, ///< Execution Breakpoint
|
||||||
|
Read, ///< Read Breakpoint
|
||||||
|
Write, ///< Write Breakpoint
|
||||||
|
Access ///< Access (R/W) Breakpoint
|
||||||
|
};
|
||||||
|
|
||||||
|
/// If set to false, the server will never be started and no gdbstub-related functions will be executed.
|
||||||
|
extern std::atomic<bool> g_server_enabled;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Set the port the gdbstub should use to listen for connections.
|
||||||
|
*
|
||||||
|
* @param port Port to listen for connection
|
||||||
|
*/
|
||||||
|
void SetServerPort(u16 port);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Set the g_server_enabled flag and start or stop the server if possible.
|
||||||
|
*
|
||||||
|
* @param status Set the server to enabled or disabled.
|
||||||
|
*/
|
||||||
|
void ToggleServer(bool status);
|
||||||
|
|
||||||
|
/// Start the gdbstub server.
|
||||||
|
void Init();
|
||||||
|
|
||||||
|
/// Stop gdbstub server.
|
||||||
|
void Deinit();
|
||||||
|
|
||||||
|
/// Returns true if there is an active socket connection.
|
||||||
|
bool IsConnected();
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Signal to the gdbstub server that it should halt CPU execution.
|
||||||
|
*
|
||||||
|
* @param is_memory_break If true, the break resulted from a memory breakpoint.
|
||||||
|
*/
|
||||||
|
void Break(bool is_memory_break = false);
|
||||||
|
|
||||||
|
/// Determine if there was a memory breakpoint.
|
||||||
|
bool IsMemoryBreak();
|
||||||
|
|
||||||
|
/// Read and handle packet from gdb client.
|
||||||
|
void HandlePacket();
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Get the nearest breakpoint of the specified type at the given address.
|
||||||
|
*
|
||||||
|
* @param addr Address to search from.
|
||||||
|
* @param type Type of breakpoint.
|
||||||
|
*/
|
||||||
|
PAddr GetNextBreakpointFromAddress(u32 addr, GDBStub::BreakpointType type);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Check if a breakpoint of the specified type exists at the given address.
|
||||||
|
*
|
||||||
|
* @param addr Address of breakpoint.
|
||||||
|
* @param type Type of breakpoint.
|
||||||
|
*/
|
||||||
|
bool CheckBreakpoint(u32 addr, GDBStub::BreakpointType type);
|
||||||
|
|
||||||
|
// If set to true, the CPU will halt at the beginning of the next CPU loop.
|
||||||
|
bool GetCpuHaltFlag();
|
||||||
|
|
||||||
|
// If set to true and the CPU is halted, the CPU will step one instruction.
|
||||||
|
bool GetCpuStepFlag();
|
||||||
|
|
||||||
|
/**
|
||||||
|
* When set to true, the CPU will step one instruction when the CPU is halted next.
|
||||||
|
*
|
||||||
|
* @param is_step
|
||||||
|
*/
|
||||||
|
void SetCpuStepFlag(bool is_step);
|
||||||
|
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue