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Merge pull request #4127 from FearlessTobi/port-929

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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
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/memory.h"
const int GDB_BUFFER_SIZE = 10000;
namespace GDBStub {
namespace {
constexpr int GDB_BUFFER_SIZE = 10000;
const char GDB_STUB_START = '$';
const char GDB_STUB_END = '#';
const char GDB_STUB_ACK = '+';
const char GDB_STUB_NACK = '-';
constexpr char GDB_STUB_START = '$';
constexpr char GDB_STUB_END = '#';
constexpr char GDB_STUB_ACK = '+';
constexpr char GDB_STUB_NACK = '-';
#ifndef SIGTRAP
const u32 SIGTRAP = 5;
constexpr u32 SIGTRAP = 5;
#endif
#ifndef SIGTERM
const u32 SIGTERM = 15;
constexpr u32 SIGTERM = 15;
#endif
#ifndef MSG_WAITALL
const u32 MSG_WAITALL = 8;
constexpr u32 MSG_WAITALL = 8;
#endif
const u32 SP_REGISTER = 13;
const u32 LR_REGISTER = 14;
const u32 PC_REGISTER = 15;
const u32 CPSR_REGISTER = 25;
const u32 D0_REGISTER = 26;
const u32 FPSCR_REGISTER = 42;
constexpr u32 SP_REGISTER = 13;
constexpr u32 LR_REGISTER = 14;
constexpr u32 PC_REGISTER = 15;
constexpr u32 CPSR_REGISTER = 25;
constexpr u32 D0_REGISTER = 26;
constexpr u32 FPSCR_REGISTER = 42;
// For sample XML files see the GDB source /gdb/features
// GDB also wants the l character at the start
// 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"?>
<!DOCTYPE target SYSTEM "gdb-target.dtd">
<target version="1.0">
@ -118,29 +120,27 @@ static const char* target_xml =
</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];
static u32 command_length;
static u32 latest_signal = 0;
static bool memory_break = false;
u32 latest_signal = 0;
bool memory_break = false;
static Kernel::Thread* current_thread = nullptr;
// 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;
u16 gdbstub_port = 24689;
static bool halt_loop = true;
static bool step_loop = false;
static bool send_trap = false;
bool halt_loop = true;
bool step_loop = false;
bool send_trap = false;
// If set to false, the server will never be started and no
// gdbstub-related functions will be executed.
static std::atomic<bool> server_enabled(false);
std::atomic<bool> server_enabled(false);
#ifdef _WIN32
WSADATA InitData;
@ -148,14 +148,16 @@ WSADATA InitData;
struct Breakpoint {
bool active;
PAddr addr;
VAddr addr;
u32 len;
std::array<u8, 4> inst;
};
static std::map<u32, Breakpoint> breakpoints_execute;
static std::map<u32, Breakpoint> breakpoints_read;
static std::map<u32, Breakpoint> breakpoints_write;
using BreakpointMap = std::map<VAddr, Breakpoint>;
BreakpointMap breakpoints_execute;
BreakpointMap breakpoints_read;
BreakpointMap breakpoints_write;
} // Anonymous namespace
static Kernel::Thread* FindThreadById(int id) {
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) {
case BreakpointType::Execute:
return breakpoints_execute;
@ -397,22 +399,24 @@ static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType 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);
static void RemoveBreakpoint(BreakpointType type, VAddr addr) {
BreakpointMap& p = GetBreakpointMap(type);
auto bp = p.find(addr);
if (bp != p.end()) {
LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: {:08x} bytes at {:08x} of type {}\n",
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);
const auto bp = p.find(addr);
if (bp == p.end()) {
return;
}
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) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
auto next_breakpoint = p.lower_bound(addr);
BreakpointAddress GetNextBreakpointFromAddress(VAddr addr, BreakpointType type) {
const BreakpointMap& p = GetBreakpointMap(type);
const auto next_breakpoint = p.lower_bound(addr);
BreakpointAddress breakpoint;
if (next_breakpoint != p.end()) {
@ -426,35 +430,38 @@ BreakpointAddress GetNextBreakpointFromAddress(PAddr addr, BreakpointType type)
return breakpoint;
}
bool CheckBreakpoint(PAddr addr, BreakpointType type) {
bool CheckBreakpoint(VAddr addr, BreakpointType type) {
if (!IsConnected()) {
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()) {
u32 len = bp->second.len;
if (bp == p.end()) {
return false;
}
// 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;
}
u32 len = bp->second.len;
if (bp->second.active && (addr >= bp->second.addr && addr < bp->second.addr + len)) {
LOG_DEBUG(Debug_GDBStub,
"Found breakpoint type {} @ {:08x}, range: {:08x} - {:08x} ({} bytes)\n",
static_cast<int>(type), addr, bp->second.addr, bp->second.addr + len, len);
return true;
}
// 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 {} @ {:08x}, range: {:08x}"
" - {:08x} ({:x} bytes)",
static_cast<int>(type), addr, bp->second.addr, bp->second.addr + len, len);
return true;
}
return false;
@ -895,8 +902,8 @@ static void Continue() {
* @param addr Address of breakpoint.
* @param len Length of breakpoint.
*/
static bool CommitBreakpoint(BreakpointType type, PAddr addr, u32 len) {
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
static bool CommitBreakpoint(BreakpointType type, VAddr addr, u32 len) {
BreakpointMap& p = GetBreakpointMap(type);
Breakpoint breakpoint;
breakpoint.active = true;
@ -939,7 +946,7 @@ static void AddBreakpoint() {
auto start_offset = command_buffer + 3;
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;
u32 len =
@ -988,7 +995,7 @@ static void RemoveBreakpoint() {
auto start_offset = command_buffer + 3;
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) {
// 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 {
PAddr address;
VAddr address;
BreakpointType type;
};
@ -70,7 +70,7 @@ void HandlePacket();
* @param addr Address to search from.
* @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.
@ -78,7 +78,7 @@ BreakpointAddress GetNextBreakpointFromAddress(u32 addr, GDBStub::BreakpointType
* @param addr Address 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.
bool GetCpuHaltFlag();