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Merge pull request #4127 from FearlessTobi/port-929 

Port #929 from yuzu: "gdbstub: Minor changes "
This commit is contained in:
James Rowe 2018-08-26 12:21:11 -06:00 committed by GitHub
parent a6723ec2eb 91559bfdfe
commit 83cc398514
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 82 additions and 75 deletions
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151
src/core/gdbstub/gdbstub.cpp
View File

@ -39,36 +39,38 @@
#include "core/loader/loader.h" #include "core/loader/loader.h"
#include "core/memory.h" #include "core/memory.h"
const int GDB_BUFFER_SIZE = 10000; namespace GDBStub {
namespace {
constexpr int GDB_BUFFER_SIZE = 10000;
const char GDB_STUB_START = '$'; constexpr char GDB_STUB_START = '$';
const char GDB_STUB_END = '#'; constexpr char GDB_STUB_END = '#';
const char GDB_STUB_ACK = '+'; constexpr char GDB_STUB_ACK = '+';
const char GDB_STUB_NACK = '-'; constexpr char GDB_STUB_NACK = '-';
#ifndef SIGTRAP #ifndef SIGTRAP
const u32 SIGTRAP = 5; constexpr u32 SIGTRAP = 5;
#endif #endif
#ifndef SIGTERM #ifndef SIGTERM
const u32 SIGTERM = 15; constexpr u32 SIGTERM = 15;
#endif #endif
#ifndef MSG_WAITALL #ifndef MSG_WAITALL
const u32 MSG_WAITALL = 8; constexpr u32 MSG_WAITALL = 8;
#endif #endif
const u32 SP_REGISTER = 13; constexpr u32 SP_REGISTER = 13;
const u32 LR_REGISTER = 14; constexpr u32 LR_REGISTER = 14;
const u32 PC_REGISTER = 15; constexpr u32 PC_REGISTER = 15;
const u32 CPSR_REGISTER = 25; constexpr u32 CPSR_REGISTER = 25;
const u32 D0_REGISTER = 26; constexpr u32 D0_REGISTER = 26;
const u32 FPSCR_REGISTER = 42; constexpr u32 FPSCR_REGISTER = 42;
// For sample XML files see the GDB source /gdb/features // For sample XML files see the GDB source /gdb/features
// GDB also wants the l character at the start // GDB also wants the l character at the start
// This XML defines what the registers are for this specific ARM device // This XML defines what the registers are for this specific ARM device
static const char* target_xml = constexpr char target_xml[] =
R"(l<?xml version="1.0"?> R"(l<?xml version="1.0"?>
<!DOCTYPE target SYSTEM "gdb-target.dtd"> <!DOCTYPE target SYSTEM "gdb-target.dtd">
<target version="1.0"> <target version="1.0">
@ -118,29 +120,27 @@ static const char* target_xml =
</target> </target>
)"; )";
namespace GDBStub { int gdbserver_socket = -1;
static int gdbserver_socket = -1; u8 command_buffer[GDB_BUFFER_SIZE];
u32 command_length;
static u8 command_buffer[GDB_BUFFER_SIZE]; u32 latest_signal = 0;
static u32 command_length; bool memory_break = false;
static u32 latest_signal = 0;
static bool memory_break = false;
static Kernel::Thread* current_thread = nullptr; static Kernel::Thread* current_thread = nullptr;
// Binding to a port within the reserved ports range (0-1023) requires root permissions, // Binding to a port within the reserved ports range (0-1023) requires root permissions,
// so default to a port outside of that range. // so default to a port outside of that range.
static u16 gdbstub_port = 24689; u16 gdbstub_port = 24689;
static bool halt_loop = true; bool halt_loop = true;
static bool step_loop = false; bool step_loop = false;
static bool send_trap = false; bool send_trap = false;
// If set to false, the server will never be started and no // If set to false, the server will never be started and no
// gdbstub-related functions will be executed. // gdbstub-related functions will be executed.
static std::atomic<bool> server_enabled(false); std::atomic<bool> server_enabled(false);
#ifdef _WIN32 #ifdef _WIN32
WSADATA InitData; WSADATA InitData;
@ -148,14 +148,16 @@ WSADATA InitData;
struct Breakpoint { struct Breakpoint {
bool active; bool active;
PAddr addr; VAddr addr;
u32 len; u32 len;
std::array<u8, 4> inst; std::array<u8, 4> inst;
}; };
static std::map<u32, Breakpoint> breakpoints_execute; using BreakpointMap = std::map<VAddr, Breakpoint>;
static std::map<u32, Breakpoint> breakpoints_read; BreakpointMap breakpoints_execute;
static std::map<u32, Breakpoint> breakpoints_write; BreakpointMap breakpoints_read;
BreakpointMap breakpoints_write;
} // Anonymous namespace
static Kernel::Thread* FindThreadById(int id) { static Kernel::Thread* FindThreadById(int id) {
const auto& threads = Kernel::GetThreadList(); const auto& threads = Kernel::GetThreadList();
@ -374,11 +376,11 @@ static u8 CalculateChecksum(const u8* buffer, size_t length) {
} }
/** /**
* Get the list of breakpoints for a given breakpoint type. * Get the map of breakpoints for a given breakpoint type.
* *
* @param type Type of breakpoint list. * @param type Type of breakpoint map.
*/ */
static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) { static BreakpointMap& GetBreakpointMap(BreakpointType type) {
switch (type) { switch (type) {
case BreakpointType::Execute: case BreakpointType::Execute:
return breakpoints_execute; return breakpoints_execute;
@ -397,22 +399,24 @@ static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) {
* @param type Type of breakpoint. * @param type Type of breakpoint.
* @param addr Address of breakpoint. * @param addr Address of breakpoint.
*/ */
static void RemoveBreakpoint(BreakpointType type, PAddr addr) { static void RemoveBreakpoint(BreakpointType type, VAddr addr) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type); BreakpointMap& p = GetBreakpointMap(type);
auto bp = p.find(addr); const auto bp = p.find(addr);
if (bp != p.end()) { if (bp == p.end()) {
LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: {:08x} bytes at {:08x} of type {}\n", return;
bp->second.len, bp->second.addr, static_cast<int>(type));
Memory::WriteBlock(bp->second.addr, bp->second.inst.data(), bp->second.inst.size());
Core::CPU().ClearInstructionCache();
p.erase(addr);
} }
LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: {:08x} bytes at {:08x} of type {}",
bp->second.len, bp->second.addr, static_cast<int>(type));
Memory::WriteBlock(bp->second.addr, bp->second.inst.data(), bp->second.inst.size());
Core::CPU().ClearInstructionCache();
p.erase(addr);
} }
BreakpointAddress GetNextBreakpointFromAddress(PAddr addr, BreakpointType type) { BreakpointAddress GetNextBreakpointFromAddress(VAddr addr, BreakpointType type) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type); const BreakpointMap& p = GetBreakpointMap(type);
auto next_breakpoint = p.lower_bound(addr); const auto next_breakpoint = p.lower_bound(addr);
BreakpointAddress breakpoint; BreakpointAddress breakpoint;
if (next_breakpoint != p.end()) { if (next_breakpoint != p.end()) {
@ -426,35 +430,38 @@ BreakpointAddress GetNextBreakpointFromAddress(PAddr addr, BreakpointType type)
return breakpoint; return breakpoint;
} }
bool CheckBreakpoint(PAddr addr, BreakpointType type) { bool CheckBreakpoint(VAddr addr, BreakpointType type) {
if (!IsConnected()) { if (!IsConnected()) {
return false; return false;
} }
std::map<u32, Breakpoint>& p = GetBreakpointList(type); const BreakpointMap& p = GetBreakpointMap(type);
const auto bp = p.find(addr);
auto bp = p.find(addr); if (bp == p.end()) {
if (bp != p.end()) { return false;
u32 len = bp->second.len; }
// IDA Pro defaults to 4-byte breakpoints for all non-hardware breakpoints u32 len = bp->second.len;
// 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)) { // IDA Pro defaults to 4-byte breakpoints for all non-hardware breakpoints
LOG_DEBUG(Debug_GDBStub, // no matter if it's a 4-byte or 2-byte instruction. When you execute a
"Found breakpoint type {} @ {:08x}, range: {:08x} - {:08x} ({} bytes)\n", // Thumb instruction with a 4-byte breakpoint set, it will set a breakpoint on
static_cast<int>(type), addr, bp->second.addr, bp->second.addr + len, len); // two instructions instead of the single instruction you placed the breakpoint
return true; // 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 {} @ {:08x}, range: {:08x}"
" - {:08x} ({:x} bytes)",
static_cast<int>(type), addr, bp->second.addr, bp->second.addr + len, len);
return true;
} }
return false; return false;
@ -895,8 +902,8 @@ static void Continue() {
* @param addr Address of breakpoint. * @param addr Address of breakpoint.
* @param len Length of breakpoint. * @param len Length of breakpoint.
*/ */
static bool CommitBreakpoint(BreakpointType type, PAddr addr, u32 len) { static bool CommitBreakpoint(BreakpointType type, VAddr addr, u32 len) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type); BreakpointMap& p = GetBreakpointMap(type);
Breakpoint breakpoint; Breakpoint breakpoint;
breakpoint.active = true; breakpoint.active = true;
@ -939,7 +946,7 @@ static void AddBreakpoint() {
auto start_offset = command_buffer + 3; auto start_offset = command_buffer + 3;
auto addr_pos = std::find(start_offset, command_buffer + command_length, ','); auto addr_pos = std::find(start_offset, command_buffer + command_length, ',');
PAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset)); VAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset));
start_offset = addr_pos + 1; start_offset = addr_pos + 1;
u32 len = u32 len =
@ -988,7 +995,7 @@ static void RemoveBreakpoint() {
auto start_offset = command_buffer + 3; auto start_offset = command_buffer + 3;
auto addr_pos = std::find(start_offset, command_buffer + command_length, ','); auto addr_pos = std::find(start_offset, command_buffer + command_length, ',');
PAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset)); VAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset));
if (type == BreakpointType::Access) { if (type == BreakpointType::Access) {
// Access is made up of Read and Write types, so add both breakpoints // Access is made up of Read and Write types, so add both breakpoints

6
src/core/gdbstub/gdbstub.h
View File

@ -21,7 +21,7 @@ enum class BreakpointType {
}; };
struct BreakpointAddress { struct BreakpointAddress {
PAddr address; VAddr address;
BreakpointType type; BreakpointType type;
}; };
@ -70,7 +70,7 @@ void HandlePacket();
* @param addr Address to search from. * @param addr Address to search from.
* @param type Type of breakpoint. * @param type Type of breakpoint.
*/ */
BreakpointAddress GetNextBreakpointFromAddress(u32 addr, GDBStub::BreakpointType type); BreakpointAddress GetNextBreakpointFromAddress(VAddr addr, GDBStub::BreakpointType type);
/** /**
* Check if a breakpoint of the specified type exists at the given address. * Check if a breakpoint of the specified type exists at the given address.
@ -78,7 +78,7 @@ BreakpointAddress GetNextBreakpointFromAddress(u32 addr, GDBStub::BreakpointType
* @param addr Address of breakpoint. * @param addr Address of breakpoint.
* @param type Type of breakpoint. * @param type Type of breakpoint.
*/ */
bool CheckBreakpoint(u32 addr, GDBStub::BreakpointType type); bool CheckBreakpoint(VAddr addr, GDBStub::BreakpointType type);
// If set to true, the CPU will halt at the beginning of the next CPU loop. // If set to true, the CPU will halt at the beginning of the next CPU loop.
bool GetCpuHaltFlag(); bool GetCpuHaltFlag();