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GDBServer: Expose GTE registers

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pull/3782/head
Stenzek 2 months ago
parent 8c1a2022e4
commit c8abcf4b25
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1 changed files with 299 additions and 27 deletions
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326
src/core/gdb_server.cpp
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@ -9,6 +9,7 @@
#include "cpu_code_cache.h"
#include "cpu_core.h"
#include "cpu_core_private.h"
#include "gte.h"
#include "system.h"
#include "common/assert.h"
@ -120,6 +121,74 @@ static constexpr std::string_view TARGET_XML = R"(<?xml version="1.0"?>
<feature name="org.duckstation.gdb.mips">
<reg name="unused" bitsize="32" regnum="72" save-restore="no"/>
</feature>
<feature name="org.duckstation.gte.data">
<reg name="gte_v0_xy" bitsize="32" regnum="73" save-restore="no" group="gte-data"/>
<reg name="gte_v0_z" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_v1_xy" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_v1_z" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_v2_xy" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_v2_z" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_rgbc" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_otz" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_ir0" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_ir1" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_ir2" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_ir3" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sxy0" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sxy1" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sxy2" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sxyp" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sz0" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sz1" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sz2" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_sz3" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_rgb0" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_rgb1" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_rgb2" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_res1" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_mac0" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_mac1" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_mac2" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_mac3" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_irgb" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_orgb" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_lzcs" bitsize="32" save-restore="no" group="gte-data"/>
<reg name="gte_lzcr" bitsize="32" save-restore="no" group="gte-data"/>
</feature>
<feature name="org.duckstation.gte.control">
<reg name="gte_rt_0" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_rt_1" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_rt_2" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_rt_3" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_rt_4" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_trx" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_try" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_trz" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_llm_0" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_llm_1" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_llm_2" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_llm_3" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_llm_4" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_rbk" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_gbk" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_bbk" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_lcm_0" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_lcm_1" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_lcm_2" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_lcm_3" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_lcm_4" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_rfc" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_gfc" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_bfc" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_ofx" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_ofy" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_h" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_dqa" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_dqb" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_zsf3" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_zsf4" bitsize="32" save-restore="no" group="gte-control"/>
<reg name="gte_flag" bitsize="32" save-restore="no" group="gte-control"/>
</feature>
</target>
)";
@ -201,6 +270,9 @@ public:
void SendReplyWithAck(std::string_view reply = std::string_view());
void ResendLastReply();
void SetUseTargetDescription() { m_use_target_description = true; }
bool IsUsingTargetDescription() const { return m_use_target_description; }
void AddBreakpoint(GDBBreakpointType type, VirtualMemoryAddress address, u32 kind);
void RemoveBreakpoint(GDBBreakpointType type, VirtualMemoryAddress address, u32 kind);
void ClearBreakpoints();
@ -214,6 +286,7 @@ private:
void SendPacket(std::string_view sv);
bool m_seen_resume = false;
bool m_use_target_description = false;
SmallString m_last_stop_reply;
SmallString m_last_reply;
std::vector<ClientBreakpoint> m_breakpoints;
@ -226,6 +299,8 @@ static u8 ComputeChecksum(std::string_view str);
static bool Cmd$_questionMark(ClientSocket* client, std::string_view data);
static bool Cmd$g(ClientSocket* client, std::string_view data);
static bool Cmd$G(ClientSocket* client, std::string_view data);
static bool Cmd$p(ClientSocket* client, std::string_view data);
static bool Cmd$P(ClientSocket* client, std::string_view data);
static bool Cmd$H(ClientSocket* client, std::string_view data);
static bool Cmd$m(ClientSocket* client, std::string_view data);
static bool Cmd$M(ClientSocket* client, std::string_view data);
@ -245,6 +320,11 @@ static bool ParseSignalAndOptionalAddress(std::string_view data, u8* signal,
std::optional<VirtualMemoryAddress>* address);
static bool SendXferRead(ClientSocket* client, std::string_view data, std::string_view expected_annex,
std::string_view contents);
static void AppendRegisterValue(SmallStringBase* reply, u32 value);
static bool DecodeRegisterValue(std::string_view data, std::optional<u32>* value);
static std::optional<u32> ReadRegisterValue(u32 index);
static bool IsGTERegisterWritable(u32 index);
static bool WriteRegisterValue(u32 index, u32 value);
static void InvalidateMemoryWrite(VirtualMemoryAddress address, u32 length);
static CPU::BreakpointCallbackAction OnBreakpointHit(CPU::BreakpointType type, VirtualMemoryAddress pc,
VirtualMemoryAddress address);
@ -255,13 +335,12 @@ static bool IsPacketInterrupt(std::string_view data);
static bool IsPacketComplete(std::string_view data);
static bool ProcessPacket(ClientSocket* socket, std::string_view data);
/// yikes, lots of stack space
using LargeReplyPacket = SmallStackString<768>;
/// Number of registers in GDB remote protocol for MIPS III.
static constexpr int NUM_GDB_REGISTERS = 73;
/// Number of registers in the legacy GDB remote protocol packet for MIPS I.
static constexpr u32 NUM_GDB_REGISTERS = 73;
static constexpr u32 FIRST_GTE_GDB_REGISTER = NUM_GDB_REGISTERS;
static constexpr u32 NUM_EXTENDED_GDB_REGISTERS = NUM_GDB_REGISTERS + GTE::NUM_REGS;
/// List of GDB remote protocol registers for MIPS III (excluding FP).
/// List of GDB remote protocol registers for MIPS I (excluding FP).
static constexpr std::array<u32*, 38> REGISTERS{
&CPU::g_state.regs.r[0],
&CPU::g_state.regs.r[1],
@ -309,6 +388,8 @@ static constexpr std::pair<std::string_view, bool (*)(ClientSocket*, std::string
{"?", Cmd$_questionMark},
{"g", Cmd$g},
{"G", Cmd$G},
{"p", Cmd$p},
{"P", Cmd$P},
{"H", Cmd$H},
{"m", Cmd$m},
{"M", Cmd$M},
@ -362,6 +443,117 @@ bool GDBServer::Cmd$_questionMark(ClientSocket* client, std::string_view data)
return true;
}
void GDBServer::AppendRegisterValue(SmallStringBase* reply, u32 value)
{
// Data is in target order (little endian).
reply->append_format("{:02x}{:02x}{:02x}{:02x}", value & 0xFFu, (value >> 8) & 0xFFu, (value >> 16) & 0xFFu,
value >> 24);
}
bool GDBServer::DecodeRegisterValue(std::string_view data, std::optional<u32>* value)
{
value->reset();
if (data.size() != (sizeof(u32) * 2))
return false;
if (data.find_first_not_of("xX") == std::string_view::npos)
return true;
std::array<u8, sizeof(u32)> bytes;
if (StringUtil::DecodeHex(bytes, data) != bytes.size())
return false;
*value = ZeroExtend32(bytes[0]) | (ZeroExtend32(bytes[1]) << 8) | (ZeroExtend32(bytes[2]) << 16) |
(ZeroExtend32(bytes[3]) << 24);
return true;
}
std::optional<u32> GDBServer::ReadRegisterValue(u32 index)
{
if (index < REGISTERS.size())
return *REGISTERS[index];
if (index >= FIRST_GTE_GDB_REGISTER && index < NUM_EXTENDED_GDB_REGISTERS)
return GTE::ReadRegister(index - FIRST_GTE_GDB_REGISTER);
return std::nullopt;
}
bool GDBServer::IsGTERegisterWritable(u32 index)
{
switch (index)
{
case 15: // SXYP: pushes the SXY FIFO.
case 28: // IRGB: updates IR1, IR2, and IR3.
case 29: // ORGB: read-only.
case 30: // LZCS: updates LZCR.
case 31: // LZCR: read-only.
return false;
default:
return true;
}
}
bool GDBServer::WriteRegisterValue(u32 index, u32 value)
{
if (index < 32)
{
if (index != 0)
CPU::g_state.regs.r[index] = value;
return true;
}
switch (index)
{
case 32:
CPU::g_state.cop0_regs.sr.bits = (CPU::g_state.cop0_regs.sr.bits & ~CPU::Cop0Registers::SR::WRITE_MASK) |
(value & CPU::Cop0Registers::SR::WRITE_MASK);
CPU::UpdateMemoryPointers();
return true;
case 33:
CPU::g_state.regs.lo = value;
return true;
case 34:
CPU::g_state.regs.hi = value;
return true;
case 35:
// BadVaddr is read-only.
return true;
case 36:
CPU::g_state.cop0_regs.cause.bits = (CPU::g_state.cop0_regs.cause.bits & ~CPU::Cop0Registers::CAUSE::WRITE_MASK) |
(value & CPU::Cop0Registers::CAUSE::WRITE_MASK);
CPU::CheckForPendingInterrupt();
return true;
case 37:
if ((value & 3u) != 0)
return false;
if (value != CPU::g_state.pc)
CPU::SetPC(value);
return true;
default:
break;
}
if (index >= FIRST_GTE_GDB_REGISTER && index < NUM_EXTENDED_GDB_REGISTERS)
{
const u32 gte_index = index - FIRST_GTE_GDB_REGISTER;
if (!IsGTERegisterWritable(gte_index))
return false;
GTE::WriteRegister(gte_index, value);
return true;
}
return false;
}
/// Get general registers.
bool GDBServer::Cmd$g(ClientSocket* client, std::string_view data)
{
@ -371,19 +563,21 @@ bool GDBServer::Cmd$g(ClientSocket* client, std::string_view data)
return true;
}
LargeReplyPacket reply;
SmallStackString<(NUM_EXTENDED_GDB_REGISTERS * sizeof(u32) * 2) + 1> reply;
for (const u32* reg : REGISTERS)
{
// Data is in host order (little endian).
reply.append_format("{:02x}{:02x}{:02x}{:02x}", *reg & 0xFFu, (*reg >> 8) & 0xFFu, (*reg >> 16) & 0xFFu,
(*reg >> 24));
}
AppendRegisterValue(&reply, *reg);
// Pad with dummy data (FP registers stuff).
for (int i = 0; i < NUM_GDB_REGISTERS - static_cast<int>(REGISTERS.size()); i++)
for (u32 i = static_cast<u32>(REGISTERS.size()); i < NUM_GDB_REGISTERS; i++)
reply.append("xxxxxxxx");
if (client->IsUsingTargetDescription())
{
for (u32 i = 0; i < GTE::NUM_REGS; i++)
AppendRegisterValue(&reply, GTE::ReadRegister(i));
}
client->SendReplyWithAck(reply);
return true;
}
@ -391,23 +585,36 @@ bool GDBServer::Cmd$g(ClientSocket* client, std::string_view data)
/// Set general registers.
bool GDBServer::Cmd$G(ClientSocket* client, std::string_view data)
{
std::array<u8, NUM_GDB_REGISTERS * sizeof(u32)> bytes;
if (data.size() != bytes.size() * 2 || StringUtil::DecodeHex(bytes, data) != bytes.size())
const u32 num_registers = client->IsUsingTargetDescription() ? NUM_EXTENDED_GDB_REGISTERS : NUM_GDB_REGISTERS;
if (data.size() != (num_registers * sizeof(u32) * 2))
{
ERROR_LOG("Invalid payload for 'G' command, expected {} hex digits", bytes.size() * 2);
ERROR_LOG("Invalid payload for 'G' command, expected {} hex digits", num_registers * sizeof(u32) * 2);
client->SendReplyWithAck("E01");
return true;
}
std::array<u32, NUM_GDB_REGISTERS> values;
for (size_t i = 0; i < values.size(); i++)
std::array<std::optional<u32>, NUM_EXTENDED_GDB_REGISTERS> values;
for (u32 i = 0; i < num_registers; i++)
{
if (!DecodeRegisterValue(data.substr(i * sizeof(u32) * 2, sizeof(u32) * 2), &values[i]))
{
ERROR_LOG("Invalid register {} in 'G' command", i);
client->SendReplyWithAck("E01");
return true;
}
}
for (u32 i = 0; i < REGISTERS.size(); i++)
{
const size_t offset = i * sizeof(u32);
values[i] = ZeroExtend32(bytes[offset]) | (ZeroExtend32(bytes[offset + 1]) << 8) |
(ZeroExtend32(bytes[offset + 2]) << 16) | (ZeroExtend32(bytes[offset + 3]) << 24);
if (!values[i].has_value())
{
ERROR_LOG("Required register {} is unavailable in 'G' command", i);
client->SendReplyWithAck("E01");
return true;
}
}
const u32 new_pc = values[37];
const u32 new_pc = values[37].value();
if ((new_pc & 3u) != 0)
{
ERROR_LOG("Invalid PC 0x{:08X} in 'G' command", new_pc);
@ -417,22 +624,84 @@ bool GDBServer::Cmd$G(ClientSocket* client, std::string_view data)
CPU::g_state.regs.r[0] = 0;
for (size_t i = 1; i < 32; i++)
CPU::g_state.regs.r[i] = values[i];
CPU::g_state.regs.r[i] = values[i].value();
CPU::g_state.cop0_regs.sr.bits = (CPU::g_state.cop0_regs.sr.bits & ~CPU::Cop0Registers::SR::WRITE_MASK) |
(values[32] & CPU::Cop0Registers::SR::WRITE_MASK);
(values[32].value() & CPU::Cop0Registers::SR::WRITE_MASK);
CPU::UpdateMemoryPointers();
CPU::g_state.regs.lo = values[33];
CPU::g_state.regs.hi = values[34];
CPU::g_state.regs.lo = values[33].value();
CPU::g_state.regs.hi = values[34].value();
CPU::g_state.cop0_regs.cause.bits = (CPU::g_state.cop0_regs.cause.bits & ~CPU::Cop0Registers::CAUSE::WRITE_MASK) |
(values[36] & CPU::Cop0Registers::CAUSE::WRITE_MASK);
(values[36].value() & CPU::Cop0Registers::CAUSE::WRITE_MASK);
CPU::CheckForPendingInterrupt();
if (new_pc != CPU::g_state.pc)
CPU::SetPC(new_pc);
if (client->IsUsingTargetDescription())
{
for (u32 i = 0; i < GTE::NUM_REGS; i++)
{
const std::optional<u32>& value = values[FIRST_GTE_GDB_REGISTER + i];
if (value.has_value() && IsGTERegisterWritable(i) && value.value() != GTE::ReadRegister(i))
GTE::WriteRegister(i, value.value());
}
}
client->SendReplyWithAck("OK");
return true;
}
/// Get one register.
bool GDBServer::Cmd$p(ClientSocket* client, std::string_view data)
{
std::string_view end;
const std::optional<u32> index = StringUtil::FromChars<u32>(data, 16, &end);
const u32 num_registers = client->IsUsingTargetDescription() ? NUM_EXTENDED_GDB_REGISTERS : NUM_GDB_REGISTERS;
if (!index.has_value() || !end.empty() || index.value() >= num_registers)
{
ERROR_LOG("Invalid register in 'p' command: {}", data);
client->SendReplyWithAck("E01");
return true;
}
const std::optional<u32> value = ReadRegisterValue(index.value());
if (!value.has_value())
{
client->SendReplyWithAck("xxxxxxxx");
return true;
}
TinyString reply;
AppendRegisterValue(&reply, value.value());
client->SendReplyWithAck(reply);
return true;
}
/// Set one register.
bool GDBServer::Cmd$P(ClientSocket* client, std::string_view data)
{
std::string_view caret;
const std::optional<u32> index = StringUtil::FromChars<u32>(data, 16, &caret);
const u32 num_registers = client->IsUsingTargetDescription() ? NUM_EXTENDED_GDB_REGISTERS : NUM_GDB_REGISTERS;
if (!index.has_value() || caret.empty() || caret[0] != '=' || index.value() >= num_registers)
{
ERROR_LOG("Invalid register in 'P' command: {}", data);
client->SendReplyWithAck("E01");
return true;
}
std::optional<u32> value;
if (!DecodeRegisterValue(caret.substr(1), &value) || !value.has_value() ||
!WriteRegisterValue(index.value(), value.value()))
{
ERROR_LOG("Invalid register value in 'P' command: {}", data);
client->SendReplyWithAck("E01");
return true;
}
client->SendReplyWithAck("OK");
return true;
}
@ -680,6 +949,9 @@ bool GDBServer::Cmd$qSupported(ClientSocket* client, std::string_view data)
bool GDBServer::Cmd$qXferFeaturesRead(ClientSocket* client, std::string_view data)
{
if (data.starts_with("target.xml:"))
client->SetUseTargetDescription();
return SendXferRead(client, data, "target.xml", TARGET_XML);
}

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