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GDBStub improvements:

Browse source 
- Add FPU support
- Fix access to TLS
Fix clang-format.
This commit is contained in:
Hedges 2018-11-13 15:44:20 +00:00
parent 65bd03d74c
commit af42320021
2 changed files with 87 additions and 38 deletions
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2
CMakeLists.txt
View file

@ -377,7 +377,7 @@ if (CLANG_FORMAT)
set(CCOMMENT "Running clang format against all the .h and .cpp files in src/")
if (WIN32)
add_custom_target(clang-format
COMMAND powershell.exe -Command "${CLANG_FORMAT} -i @(Get-ChildItem -Recurse ${SRCS}/* -Include \'*.h\', \'*.cpp\')"
COMMAND powershell.exe -Command "Get-ChildItem ${SRCS}/* -Include *.cpp,*.h -Recurse | Foreach {${CLANG_FORMAT} -i $_.fullname}"
COMMENT ${CCOMMENT})
elseif(MINGW)
add_custom_target(clang-format

123
src/core/gdbstub/gdbstub.cpp
View file

@ -71,10 +71,6 @@ constexpr u32 PSTATE_REGISTER = 33;
constexpr u32 UC_ARM64_REG_Q0 = 34;
constexpr u32 FPCR_REGISTER = 66;
// TODO/WiP - Used while working on support for FPU
constexpr u32 TODO_DUMMY_REG_997 = 997;
constexpr u32 TODO_DUMMY_REG_998 = 998;
// 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
@ -260,6 +256,36 @@ static void RegWrite(std::size_t id, u64 val, Kernel::Thread* thread = nullptr)
}
}
static u128 FpuRead(std::size_t id, Kernel::Thread* thread = nullptr) {
if (!thread) {
return u128{0};
}
auto& thread_context = thread->GetContext();
if (id >= UC_ARM64_REG_Q0 && id < FPCR_REGISTER) {
return thread_context.vector_registers[id - UC_ARM64_REG_Q0];
} else if (id == FPCR_REGISTER) {
return u128{thread_context.fpcr, 0};
} else {
return u128{0};
}
}
static void FpuWrite(std::size_t id, u128 val, Kernel::Thread* thread = nullptr) {
if (!thread) {
return;
}
auto& thread_context = thread->GetContext();
if (id >= UC_ARM64_REG_Q0 && id < FPCR_REGISTER) {
thread_context.vector_registers[id - UC_ARM64_REG_Q0] = val;
} else if (id == FPCR_REGISTER) {
thread_context.fpcr = val[0];
}
}
/**
* Turns hex string character into the equivalent byte.
*
@ -409,6 +435,27 @@ static u64 GdbHexToLong(const u8* src) {
return output;
}
/**
* Convert a gdb-formatted hex string into a u128.
*
* @param src Pointer to hex string.
*/
static u128 GdbHexToU128(const u8* src) {
u128 output;
for (int i = 0; i < 16; i += 2) {
output[0] = (output[0] << 4) | HexCharToValue(src[15 - i - 1]);
output[0] = (output[0] << 4) | HexCharToValue(src[15 - i]);
}
for (int i = 0; i < 16; i += 2) {
output[1] = (output[1] << 4) | HexCharToValue(src[16 + 15 - i - 1]);
output[1] = (output[1] << 4) | HexCharToValue(src[16 + 15 - i]);
}
return output;
}
/// Read a byte from the gdb client.
static u8 ReadByte() {
u8 c;
@ -599,8 +646,7 @@ static void HandleQuery() {
for (u32 core = 0; core < Core::NUM_CPU_CORES; core++) {
const auto& threads = Core::System::GetInstance().Scheduler(core).GetThreadList();
for (const auto& thread : threads) {
val += fmt::format("{:x}", thread->GetThreadID());
val += ",";
val += fmt::format("{:x},", thread->GetThreadID());
}
}
val.pop_back();
@ -791,11 +837,15 @@ static void ReadRegister() {
} else if (id == PSTATE_REGISTER) {
IntToGdbHex(reply, static_cast<u32>(RegRead(id, current_thread)));
} else if (id >= UC_ARM64_REG_Q0 && id < FPCR_REGISTER) {
LongToGdbHex(reply, RegRead(id, current_thread));
u128 r = FpuRead(id, current_thread);
LongToGdbHex(reply, r[0]);
LongToGdbHex(reply + 16, r[1]);
} else if (id == FPCR_REGISTER) {
LongToGdbHex(reply, RegRead(TODO_DUMMY_REG_998, current_thread));
} else {
LongToGdbHex(reply, RegRead(TODO_DUMMY_REG_997, current_thread));
u128 r = FpuRead(id, current_thread);
IntToGdbHex(reply, static_cast<u32>(r[0]));
} else if (id == FPCR_REGISTER + 1) {
u128 r = FpuRead(id, current_thread);
IntToGdbHex(reply, static_cast<u32>(r[0] >> 32));
}
SendReply(reinterpret_cast<char*>(reply));
@ -822,13 +872,18 @@ static void ReadRegisters() {
bufptr += 8;
for (u32 reg = UC_ARM64_REG_Q0; reg <= UC_ARM64_REG_Q0 + 31; reg++) {
LongToGdbHex(bufptr + reg * 16, RegRead(reg, current_thread));
u128 r;
for (u32 reg = UC_ARM64_REG_Q0; reg < FPCR_REGISTER; reg++) {
r = FpuRead(reg, current_thread);
LongToGdbHex(bufptr + reg * 32, r[0]);
LongToGdbHex(bufptr + reg * 32 + 16, r[1]);
}
bufptr += 32 * 32;
LongToGdbHex(bufptr, RegRead(TODO_DUMMY_REG_998, current_thread));
r = FpuRead(FPCR_REGISTER, current_thread);
IntToGdbHex(bufptr, static_cast<u32>(r[0]));
bufptr += 8;
@ -853,14 +908,12 @@ static void WriteRegister() {
} else if (id == PSTATE_REGISTER) {
RegWrite(id, GdbHexToInt(buffer_ptr), current_thread);
} else if (id >= UC_ARM64_REG_Q0 && id < FPCR_REGISTER) {
RegWrite(id, GdbHexToLong(buffer_ptr), current_thread);
FpuWrite(id, GdbHexToU128(buffer_ptr), current_thread);
} else if (id == FPCR_REGISTER) {
RegWrite(TODO_DUMMY_REG_998, GdbHexToLong(buffer_ptr), current_thread);
} else {
RegWrite(TODO_DUMMY_REG_997, GdbHexToLong(buffer_ptr), current_thread);
} else if (id == FPCR_REGISTER + 1) {
}
// Update Unicorn context skipping scheduler, no running threads at this point
// Update ARM context, skipping scheduler - no running threads at this point
Core::System::GetInstance()
.ArmInterface(current_core)
.LoadContext(current_thread->GetContext());
@ -885,13 +938,13 @@ static void WriteRegisters() {
} else if (reg >= UC_ARM64_REG_Q0 && reg < FPCR_REGISTER) {
RegWrite(reg, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else if (reg == FPCR_REGISTER) {
RegWrite(TODO_DUMMY_REG_998, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else {
UNIMPLEMENTED();
RegWrite(FPCR_REGISTER, GdbHexToLong(buffer_ptr + i * 16), current_thread);
} else if (reg == FPCR_REGISTER + 1) {
RegWrite(FPCR_REGISTER, GdbHexToLong(buffer_ptr + i * 16), current_thread);
}
}
// Update Unicorn context skipping scheduler, no running threads at this point
// Update ARM context, skipping scheduler - no running threads at this point
Core::System::GetInstance()
.ArmInterface(current_core)
.LoadContext(current_thread->GetContext());
@ -917,12 +970,6 @@ static void ReadMemory() {
SendReply("E01");
}
const auto& vm_manager = Core::CurrentProcess()->VMManager();
if (addr < vm_manager.GetCodeRegionBaseAddress() ||
addr >= vm_manager.GetMapRegionEndAddress()) {
return SendReply("E00");
}
if (!Memory::IsValidVirtualAddress(addr)) {
return SendReply("E00");
}
@ -967,7 +1014,7 @@ void Break(bool is_memory_break) {
static void Step() {
if (command_length > 1) {
RegWrite(PC_REGISTER, GdbHexToLong(command_buffer + 1), current_thread);
// Update Unicorn context skipping scheduler, no running threads at this point
// Update ARM context, skipping scheduler - no running threads at this point
Core::System::GetInstance()
.ArmInterface(current_core)
.LoadContext(current_thread->GetContext());
@ -1010,7 +1057,7 @@ static bool CommitBreakpoint(BreakpointType type, VAddr addr, u64 len) {
breakpoint.addr = addr;
breakpoint.len = len;
Memory::ReadBlock(addr, breakpoint.inst.data(), breakpoint.inst.size());
static constexpr std::array<u8, 4> btrap{{0x00, 0x7d, 0x20, 0xd4}};
static constexpr std::array<u8, 4> btrap{0x00, 0x7d, 0x20, 0xd4};
Memory::WriteBlock(addr, btrap.data(), btrap.size());
Core::System::GetInstance().InvalidateCpuInstructionCaches();
p.insert({addr, breakpoint});
@ -1321,13 +1368,15 @@ void SetCpuStepFlag(bool is_step) {
}
void SendTrap(Kernel::Thread* thread, int trap) {
if (send_trap) {
if (!halt_loop || current_thread == thread) {
current_thread = thread;
SendSignal(thread, trap);
}
halt_loop = true;
send_trap = false;
if (!send_trap) {
return;
}
if (!halt_loop || current_thread == thread) {
current_thread = thread;
SendSignal(thread, trap);
}
halt_loop = true;
send_trap = false;
}
}; // namespace GDBStub