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Atmosphere/stratosphere/dmnt.gen2/source/dmnt2_gdb_server_impl.cpp

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dmnt: begin working on packet parser
2021-07-16 10:40:08 +01:00
/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "dmnt2_debug_log.hpp"
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#include "dmnt2_gdb_server_impl.hpp"
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namespace ams::dmnt {
namespace {
constexpr const char TargetXmlAarch64[] =
"l<?xml version=\"1.0\"?>"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
"<target>"
"<architecture>aarch64</architecture>"
"<xi:include href=\"aarch64-core.xml\"/>"
"<xi:include href=\"aarch64-fpu.xml\"/>"
"</target>";
constexpr const char Aarch64CoreXml[] =
"l<?xml version=\"1.0\"?>\n"
"<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">\n"
"<feature name=\"org.gnu.gdb.aarch64.core\">\n"
"\t<reg name=\"x0\" bitsize=\"64\"/>\n"
"\t<reg name=\"x1\" bitsize=\"64\"/>\n"
"\t<reg name=\"x2\" bitsize=\"64\"/>\n"
"\t<reg name=\"x3\" bitsize=\"64\"/>\n"
"\t<reg name=\"x4\" bitsize=\"64\"/>\n"
"\t<reg name=\"x5\" bitsize=\"64\"/>\n"
"\t<reg name=\"x6\" bitsize=\"64\"/>\n"
"\t<reg name=\"x7\" bitsize=\"64\"/>\n"
"\t<reg name=\"x8\" bitsize=\"64\"/>\n"
"\t<reg name=\"x9\" bitsize=\"64\"/>\n"
"\t<reg name=\"x10\" bitsize=\"64\"/>\n"
"\t<reg name=\"x11\" bitsize=\"64\"/>\n"
"\t<reg name=\"x12\" bitsize=\"64\"/>\n"
"\t<reg name=\"x13\" bitsize=\"64\"/>\n"
"\t<reg name=\"x14\" bitsize=\"64\"/>\n"
"\t<reg name=\"x15\" bitsize=\"64\"/>\n"
"\t<reg name=\"x16\" bitsize=\"64\"/>\n"
"\t<reg name=\"x17\" bitsize=\"64\"/>\n"
"\t<reg name=\"x18\" bitsize=\"64\"/>\n"
"\t<reg name=\"x19\" bitsize=\"64\"/>\n"
"\t<reg name=\"x20\" bitsize=\"64\"/>\n"
"\t<reg name=\"x21\" bitsize=\"64\"/>\n"
"\t<reg name=\"x22\" bitsize=\"64\"/>\n"
"\t<reg name=\"x23\" bitsize=\"64\"/>\n"
"\t<reg name=\"x24\" bitsize=\"64\"/>\n"
"\t<reg name=\"x25\" bitsize=\"64\"/>\n"
"\t<reg name=\"x26\" bitsize=\"64\"/>\n"
"\t<reg name=\"x27\" bitsize=\"64\"/>\n"
"\t<reg name=\"x28\" bitsize=\"64\"/>\n"
"\t<reg name=\"x29\" bitsize=\"64\"/>\n"
"\t<reg name=\"x30\" bitsize=\"64\"/>\n"
"\t<reg name=\"sp\" bitsize=\"64\" type=\"data_ptr\"/>\n"
"\t<reg name=\"pc\" bitsize=\"64\" type=\"code_ptr\"/>\n"
"\t<flags id=\"cpsr_flags\" size=\"4\">\n"
"\t\t<field name=\"SP\" start=\"0\" end=\"0\" /><!-- Stack Pointer selection -->\n"
"\t\t<field name=\"EL\" start=\"2\" end=\"3\" /><!-- Exception level -->\n"
"\t\t<field name=\"nRW\" start=\"4\" end=\"4\" /><!-- Execution state (not Register Width) 0=64-bit 1-32-bit -->\n"
"\n"
"\t\t<field name=\"F\" start=\"6\" end=\"6\" /><!-- FIQ mask -->\n"
"\t\t<field name=\"I\" start=\"7\" end=\"7\" /><!-- IRQ mask -->\n"
"\t\t<field name=\"A\" start=\"8\" end=\"8\" /><!-- SError interrupt mask -->\n"
"\t\t<field name=\"D\" start=\"9\" end=\"9\" /><!-- Debug mask bit -->\n"
"\n"
"\t\t<field name=\"SSBS\" start=\"12\" end=\"12\"/><!-- Speculative Store Bypass Safe -->\n"
"\n"
"\t\t<field name=\"IL\" start=\"20\" end=\"20\"/><!-- Illegal execution state -->\n"
"\t\t<field name=\"SS\" start=\"21\" end=\"21\"/><!-- Software step -->\n"
"\t\t<field name=\"PAN\" start=\"22\" end=\"22\"/><!-- v8.1 Privileged Access Never -->\n"
"\t\t<field name=\"UAO\" start=\"23\" end=\"23\"/><!-- v8.2 User Access Override -->\n"
"\t\t<field name=\"DIT\" start=\"24\" end=\"24\"/><!-- v8.4 Data Independent Timing -->\n"
"\t\t<field name=\"TCO\" start=\"25\" end=\"25\"/><!-- v8.5 Tag Check Override -->\n"
"\n"
"\t\t<field name=\"V\" start=\"28\" end=\"28\"/><!-- oVerflow condition flag -->\n"
"\t\t<field name=\"C\" start=\"29\" end=\"29\"/><!-- Carry condition flag -->\n"
"\t\t<field name=\"Z\" start=\"30\" end=\"30\"/><!-- Zero condition flag -->\n"
"\t\t<field name=\"N\" start=\"31\" end=\"31\"/><!-- Negative condition flag -->\n"
"\t</flags>\n"
"\t<reg name=\"cpsr\" bitsize=\"32\" type=\"cpsr_flags\"/>\n"
"</feature>";
constexpr const char Aarch64FpuXml[] =
"l<?xml version=\"1.0\"?>\n"
"<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">\n"
"<feature name=\"org.gnu.gdb.aarch64.fpu\">\n"
"\t<vector id=\"v2d\" type=\"ieee_double\" count=\"2\"/>\n"
"\t<vector id=\"v2u\" type=\"uint64\" count=\"2\"/>\n"
"\t<vector id=\"v2i\" type=\"int64\" count=\"2\"/>\n"
"\t<vector id=\"v4f\" type=\"ieee_single\" count=\"4\"/>\n"
"\t<vector id=\"v4u\" type=\"uint32\" count=\"4\"/>\n"
"\t<vector id=\"v4i\" type=\"int32\" count=\"4\"/>\n"
"\t<!-- <vector id=\"v8f\" type=\"ieee_half\" count=\"8\"/> -->\n"
"\t<vector id=\"v8u\" type=\"uint16\" count=\"8\"/>\n"
"\t<vector id=\"v8i\" type=\"int16\" count=\"8\"/>\n"
"\t<vector id=\"v16u\" type=\"uint8\" count=\"16\"/>\n"
"\t<vector id=\"v16i\" type=\"int8\" count=\"16\"/>\n"
"\t<vector id=\"v1u\" type=\"uint128\" count=\"1\"/>\n"
"\t<vector id=\"v1i\" type=\"int128\" count=\"1\"/>\n"
"\t<union id=\"vnd\">\n"
"\t\t<field name=\"f\" type=\"v2d\"/>\n"
"\t\t<field name=\"u\" type=\"v2u\"/>\n"
"\t\t<field name=\"s\" type=\"v2i\"/>\n"
"\t</union>\n"
"\t<union id=\"vns\">\n"
"\t\t<field name=\"f\" type=\"v4f\"/>\n"
"\t\t<field name=\"u\" type=\"v4u\"/>\n"
"\t\t<field name=\"s\" type=\"v4i\"/>\n"
"\t</union>\n"
"\t<union id=\"vnh\">\n"
"\t\t<!-- <field name=\"f\" type=\"v8f\"/> -->\n"
"\t\t<field name=\"u\" type=\"v8u\"/>\n"
"\t\t<field name=\"s\" type=\"v8i\"/>\n"
"\t</union>\n"
"\t<union id=\"vnb\">\n"
"\t\t<field name=\"u\" type=\"v16u\"/>\n"
"\t\t<field name=\"s\" type=\"v16i\"/>\n"
"\t</union>\n"
"\t<union id=\"vnq\">\n"
"\t\t<field name=\"u\" type=\"v1u\"/>\n"
"\t\t<field name=\"s\" type=\"v1i\"/>\n"
"\t</union>\n"
"\t<union id=\"aarch64v\">\n"
"\t\t<field name=\"d\" type=\"vnd\"/>\n"
"\t\t<field name=\"s\" type=\"vns\"/>\n"
"\t\t<field name=\"h\" type=\"vnh\"/>\n"
"\t\t<field name=\"b\" type=\"vnb\"/>\n"
"\t\t<field name=\"q\" type=\"vnq\"/>\n"
"\t</union>\n"
"\t<reg name=\"v0\" bitsize=\"128\" type=\"aarch64v\" regnum=\"34\"/>\n"
"\t<reg name=\"v1\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v2\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v3\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v4\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v5\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v6\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v7\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v8\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v9\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v10\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v11\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v12\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v13\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v14\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v15\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v16\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v17\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v18\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v19\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v20\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v21\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v22\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v23\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v24\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v25\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v26\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v27\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v28\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v29\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v30\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"v31\" bitsize=\"128\" type=\"aarch64v\"/>\n"
"\t<reg name=\"fpsr\" bitsize=\"32\"/>\n"
"\t<reg name=\"fpcr\" bitsize=\"32\"/>\n"
"</feature>";
constexpr const char TargetXmlAarch32[] =
"l<?xml version=\"1.0\"?>"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
"<target>"
"<xi:include href=\"arm-core.xml\"/>"
"<xi:include href=\"arm-vfp.xml\"/>"
"</target>";
constexpr const char ArmCoreXml[] =
"l<?xml version=\"1.0\"?>\n"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
"<feature name=\"org.gnu.gdb.arm.core\">\n"
"\t<reg name=\"r0\" bitsize=\"32\"/>\n"
"\t<reg name=\"r1\" bitsize=\"32\"/>\n"
"\t<reg name=\"r2\" bitsize=\"32\"/>\n"
"\t<reg name=\"r3\" bitsize=\"32\"/>\n"
"\t<reg name=\"r4\" bitsize=\"32\"/>\n"
"\t<reg name=\"r5\" bitsize=\"32\"/>\n"
"\t<reg name=\"r6\" bitsize=\"32\"/>\n"
"\t<reg name=\"r7\" bitsize=\"32\"/>\n"
"\t<reg name=\"r8\" bitsize=\"32\"/>\n"
"\t<reg name=\"r9\" bitsize=\"32\"/>\n"
"\t<reg name=\"r10\" bitsize=\"32\"/>\n"
"\t<reg name=\"r11\" bitsize=\"32\"/>\n"
"\t<reg name=\"r12\" bitsize=\"32\"/>\n"
"\t<reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>\n"
"\t<reg name=\"lr\" bitsize=\"32\"/>\n"
"\t<reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>\n"
"\t<reg name=\"cpsr\" bitsize=\"32\" regnum=\"25\"/>\n"
"</feature>\n";
constexpr const char ArmVfpXml[] =
"l<?xml version=\"1.0\"?>\n"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
"<feature name=\"org.gnu.gdb.arm.vfp\">\n"
"\t<reg name=\"d0\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d1\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d2\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d3\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d4\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d5\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d6\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d7\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d8\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d9\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d10\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d11\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d12\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d13\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d14\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d15\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d16\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d17\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d18\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d19\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d20\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d21\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d22\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d23\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d24\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d25\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d26\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d27\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d28\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d29\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d30\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"d31\" bitsize=\"64\" type=\"ieee_double\"/>\n"
"\t<reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
"</feature>\n";
bool ParsePrefix(char *&packet, const char *prefix) {
const auto len = std::strlen(prefix);
if (std::strncmp(packet, prefix, len) == 0) {
packet += len;
return true;
} else {
return false;
}
}
void SetReplyOk(char *reply) {
std::strcpy(reply, "OK");
}
void SetReplyError(char *reply, const char *err) {
AMS_DMNT2_GDB_LOG_ERROR("Reply Error: %s\n", err);
std::strcpy(reply, err);
}
void SetReply(char *reply, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
void SetReply(char *reply, const char *fmt, ...) {
std::va_list vl;
va_start(vl, fmt);
util::VSNPrintf(reply, GdbPacketBufferSize, fmt, vl);
va_end(vl);
}
void AppendReply(char *reply, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
void AppendReply(char *reply, const char *fmt, ...) {
const auto len = std::strlen(reply);
std::va_list vl;
va_start(vl, fmt);
util::VSNPrintf(reply + len, GdbPacketBufferSize - len, fmt, vl);
va_end(vl);
}
constexpr int DecodeHex(char c) {
if ('a' <= c && c <= 'f') {
return 10 + (c - 'a');
} else if ('A' <= c && c <= 'F') {
return 10 + (c - 'A');
} else if ('0' <= c && c <= '9') {
return 0 + (c - '0');
} else {
return -1;
}
}
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constexpr u64 DecodeHex(const char *s) {
u64 value = 0;
while (true) {
const char c = *(s++);
if (int v = DecodeHex(c); v >= 0) {
value <<= 4;
value |= v & 0xF;
} else {
break;
}
}
return value;
}
void MemoryToHex(char *dst, const void *mem, size_t size) {
const u8 *mem_u8 = static_cast<const u8 *>(mem);
while (size-- > 0) {
const u8 v = *(mem_u8++);
*(dst++) = "0123456789abcdef"[v >> 4];
*(dst++) = "0123456789abcdef"[v & 0xF];
}
*dst = 0;
}
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void ParseOffsetLength(const char *packet, u32 &offset, u32 &length) {
/* Default to zero. */
offset = 0;
length = 0;
bool parsed_offset = false;
while (*packet) {
const char c = *(packet++);
if (c == ',') {
parsed_offset = true;
} else if (auto hex = DecodeHex(c); hex >= 0) {
if (parsed_offset) {
length <<= 4;
length |= hex;
} else {
offset <<= 4;
offset |= hex;
}
}
}
AMS_DMNT2_GDB_LOG_DEBUG("Offset/Length %x/%x\n", offset, length);
}
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constinit char g_process_list_buffer[0x2000];
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constinit os::SdkMutex g_event_request_lock;
constinit os::SdkMutex g_event_lock;
constinit os::SdkConditionVariable g_event_request_cv;
constinit os::SdkConditionVariable g_event_done_cv;
}
GdbServerImpl::GdbServerImpl(int socket, void *stack, size_t stack_size) : m_socket(socket), m_session(socket), m_packet_io(), m_state(State::Initial), m_event(os::EventClearMode_AutoClear) {
/* Create and start the events thread. */
R_ABORT_UNLESS(os::CreateThread(std::addressof(m_events_thread), DebugEventsThreadEntry, this, stack, stack_size, os::HighestThreadPriority - 1));
os::StartThread(std::addressof(m_events_thread));
/* Set our state. */
m_state = State::Running;
}
GdbServerImpl::~GdbServerImpl() {
/* Set ourselves as killed. */
m_killed = true;
/* Signal to our events thread. */
{
std::scoped_lock lk(g_event_request_lock);
g_event_request_cv.Signal();
}
/* Signal our event. */
m_event.Signal();
/* Wait for our thread to finish. */
os::WaitThread(std::addressof(m_events_thread));
os::DestroyThread(std::addressof(m_events_thread));
/* Clear our state. */
m_state = State::Destroyed;
/* Detach. */
if (m_attached) {
R_ABORT_UNLESS(svc::CloseHandle(m_debug_handle));
}
}
void GdbServerImpl::DebugEventsThread() {
/* Process events. */
{
std::scoped_lock lk(g_event_lock);
/* Loop while we're not killed. */
while (!m_killed) {
/* Wait for a request to come in. */
g_event_request_cv.Wait(g_event_lock);
/* Check that we're not killed now. */
if (m_killed) {
break;
}
/* Set ourselves as unattached. */
m_attached = false;
/* If we have a process id, attach. */
if (R_FAILED(svc::DebugActiveProcess(std::addressof(m_debug_handle), m_process_id.value))) {
AMS_DMNT2_GDB_LOG_DEBUG("Failed to attach to %016lx\n", m_process_id.value);
m_debug_handle = svc::InvalidHandle;
g_event_done_cv.Signal();
continue;
}
/* Get the process id. */
if (R_FAILED(svc::GetProcessId(std::addressof(m_process_id.value), m_debug_handle))) {
AMS_DMNT2_GDB_LOG_DEBUG("Failed to get process id for debug handle\n");
R_ABORT_UNLESS(svc::CloseHandle(m_debug_handle));
m_debug_handle = svc::InvalidHandle;
g_event_done_cv.Signal();
continue;
}
/* Set ourselves as attached. */
m_attached = true;
/* Get the create process event. */
{
svc::DebugEventInfo d;
R_ABORT_UNLESS(svc::GetDebugEvent(std::addressof(d), m_debug_handle));
AMS_ABORT_UNLESS(d.type == svc::DebugEvent_CreateProcess);
m_create_process_info = d.info.create_process;
}
/* Signal that we're done attaching. */
g_event_done_cv.Signal();
/* Process debug events without the lock held. */
{
g_event_lock.Unlock();
this->ProcessDebugEvents();
g_event_lock.Lock();
}
/* Clear our process ids. */
m_process_id = os::InvalidProcessId;
m_target_process_id = os::InvalidProcessId;
}
}
/* Set our state. */
m_state = State::Exited;
}
void GdbServerImpl::ProcessDebugEvents() {
AMS_DMNT2_GDB_LOG_DEBUG("Processing debug events for %016lx\n", m_process_id.value);
while (true) {
/* Wait for an event to come in. */
const Result wait_result = [&] ALWAYS_INLINE_LAMBDA {
std::scoped_lock lk(g_event_lock);
s32 dummy = -1;
return svc::WaitSynchronization(std::addressof(dummy), std::addressof(m_debug_handle), 1, TimeSpan::FromMilliSeconds(20).GetNanoSeconds());
}();
/* Check if we're killed. */
if (m_killed) {
break;
}
/* If we didn't get an event, try again. */
if (svc::ResultTimedOut::Includes(wait_result)) {
continue;
}
/* Try to get the event. */
svc::DebugEventInfo d;
if (R_FAILED(svc::GetDebugEvent(std::addressof(d), m_debug_handle))) {
continue;
}
/* Process the event. */
switch (d.type) {
default:
AMS_DMNT2_GDB_LOG_DEBUG("Unhandled ProcessEvent %u\n", static_cast<u32>(d.type));
break;
}
}
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}
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void GdbServerImpl::SetStopReplyPacket(GdbSignal signal) {
/* Set the signal. */
SetReply(m_reply_packet, "T%02X", static_cast<u32>(signal));
/* Get the thread context. */
svc::ThreadContext thread_context = {};
svc::GetDebugThreadContext(std::addressof(thread_context), m_debug_handle, m_thread_id, svc::ThreadContextFlag_General | svc::ThreadContextFlag_Control);
/* Add important registers. */
/* TODO: aarch32 */
{
if (thread_context.fp != 0) {
AppendReply(m_reply_packet, "1d:%016lx", util::ConvertToBigEndian(thread_context.fp));
} else {
AppendReply(m_reply_packet, "1d:0*,");
}
if (thread_context.sp != 0) {
AppendReply(m_reply_packet, ";1f:%016lx", util::ConvertToBigEndian(thread_context.sp));
} else {
AppendReply(m_reply_packet, ";1f:0*,");
}
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if (thread_context.pc != 0) {
AppendReply(m_reply_packet, ";20:%016lx", util::ConvertToBigEndian(thread_context.pc));
} else {
AppendReply(m_reply_packet, ";20:0*,");
}
}
/* Add the thread id. */
AppendReply(m_reply_packet, ";thread:p%lx.%lx", m_target_process_id.value, m_thread_id);
/* Add the thread core. */
{
u64 dummy;
u32 core = 0;
svc::GetDebugThreadParam(std::addressof(dummy), std::addressof(core), m_debug_handle, m_thread_id, svc::DebugThreadParam_CurrentCore);
AppendReply(m_reply_packet, ";core:%u;", core);
}
}
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void GdbServerImpl::LoopProcess() {
/* Process packets. */
while (m_session.IsValid()) {
/* Receive a packet. */
bool do_break = false;
char recv_buf[GdbPacketBufferSize];
char *packet = this->ReceivePacket(std::addressof(do_break), recv_buf, sizeof(recv_buf));
if (!do_break && packet != nullptr) {
/* Process the packet. */
char reply_buffer[GdbPacketBufferSize];
this->ProcessPacket(packet, reply_buffer);
/* Send packet. */
this->SendPacket(std::addressof(do_break), reply_buffer);
}
}
}
void GdbServerImpl::ProcessPacket(char *receive, char *reply) {
/* Set our fields. */
m_receive_packet = receive;
m_reply_packet = reply;
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/* Log the packet we're processing. */
AMS_DMNT2_GDB_LOG_DEBUG("Receive: %s\n", m_receive_packet);
/* Clear our reply packet. */
m_reply_packet[0] = 0;
/* Handle the received packet. */
switch (m_receive_packet[0]) {
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case 'H':
this->H();
break;
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case 'g':
if (!this->g()) {
m_killed = true;
}
break;
case 'm':
this->m();
break;
case 'v':
this->v();
break;
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case 'q':
this->q();
break;
case '!':
SetReplyOk(m_reply_packet);
break;
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case '?':
this->QuestionMark();
break;
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default:
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented: %s\n", m_receive_packet);
break;
}
}
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void GdbServerImpl::H() {
if (this->HasDebugProcess()) {
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if (ParsePrefix(m_receive_packet, "Hg") || ParsePrefix(m_receive_packet, "HG")) {
this->Hg();
} else {
SetReplyError(m_reply_packet, "E01");
}
} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::Hg() {
if (const char *dot = std::strchr(m_receive_packet, '.'); dot != nullptr) {
m_thread_id = DecodeHex(dot + 1);
AMS_DMNT2_GDB_LOG_DEBUG("Set thread id = %lx\n", m_thread_id);
/* TODO: Validate thread exists for the process? */
}
SetReplyOk(m_reply_packet);
}
bool GdbServerImpl::g() {
/* TODO: aarch32 */
/* Get thread context. */
svc::ThreadContext thread_context;
if (R_FAILED(svc::GetDebugThreadContext(std::addressof(thread_context), m_debug_handle, m_thread_id, svc::ThreadContextFlag_All))) {
return false;
}
/* Copy general purpose registers. */
for (size_t i = 0; i < util::size(thread_context.r); ++i) {
if (thread_context.r[i] != 0) {
AppendReply(m_reply_packet, "%016lx", util::ConvertToBigEndian(thread_context.r[i]));
} else {
AppendReply(m_reply_packet, "0*,");
}
}
/* Copy special registers. */
if (thread_context.fp != 0) {
AppendReply(m_reply_packet, "%016lx", util::ConvertToBigEndian(thread_context.fp));
} else {
AppendReply(m_reply_packet, "0*,");
}
if (thread_context.lr != 0) {
AppendReply(m_reply_packet, "%016lx", util::ConvertToBigEndian(thread_context.lr));
} else {
AppendReply(m_reply_packet, "0*,");
}
if (thread_context.sp != 0) {
AppendReply(m_reply_packet, "%016lx", util::ConvertToBigEndian(thread_context.sp));
} else {
AppendReply(m_reply_packet, "0*,");
}
if (thread_context.pc != 0) {
AppendReply(m_reply_packet, "%016lx", util::ConvertToBigEndian(thread_context.pc));
} else {
AppendReply(m_reply_packet, "0*,");
}
if (thread_context.pstate != 0) {
AppendReply(m_reply_packet, "%08x", util::ConvertToBigEndian(thread_context.pstate));
} else {
AppendReply(m_reply_packet, "0*\"0");
}
/* Copy FPU registers. */
for (size_t i = 0; i < util::size(thread_context.v); ++i) {
if (thread_context.v[i] != 0) {
AppendReply(m_reply_packet, "%016lx%016lx", util::ConvertToBigEndian(static_cast<u64>(thread_context.v[i] >> 0)), util::ConvertToBigEndian(static_cast<u64>(thread_context.v[i] >> BITSIZEOF(u64))));
} else {
AppendReply(m_reply_packet, "0*<");
}
}
return true;
}
void GdbServerImpl::m() {
++m_receive_packet;
/* Validate format. */
const char *comma = std::strchr(m_receive_packet, ',');
if (comma == nullptr) {
SetReplyError(m_reply_packet, "E01");
return;
}
/* Parse address/length. */
const u64 address = DecodeHex(m_receive_packet);
const u64 length = DecodeHex(comma + 1);
if (length >= sizeof(m_buffer)) {
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SetReplyError(m_reply_packet, "E01");
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return;
}
/* Read the memory. */
/* TODO: Detect partial readability? */
if (R_FAILED(svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(m_buffer), m_debug_handle, address, length))) {
SetReplyError(m_reply_packet, "E01");
return;
}
/* Encode the memory. */
MemoryToHex(m_reply_packet, m_buffer, length);
}
void GdbServerImpl::v() {
if (ParsePrefix(m_receive_packet, "vAttach;")) {
this->vAttach();
} else {
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented v: %s\n", m_receive_packet);
}
}
void GdbServerImpl::vAttach() {
if (!this->HasDebugProcess()) {
/* Get the process id. */
if (const u64 process_id = DecodeHex(m_receive_packet); process_id != 0) {
/* Set our process id. */
m_process_id = { process_id };
m_target_process_id = { process_id };
/* Wait for us to be attached. */
bool attached;
{
std::scoped_lock lk(g_event_request_lock);
g_event_request_cv.Signal();
if (!g_event_done_cv.TimedWait(g_event_request_lock, TimeSpan::FromSeconds(2))) {
m_event.Signal();
}
attached = m_attached;
}
/* If we're attached, send a stop reply packet. */
if (attached) {
/* Set our initial thread id. */
{
s32 dummy;
u64 thread_id = 0;
R_ABORT_UNLESS(svc::GetThreadList(std::addressof(dummy), std::addressof(thread_id), 1, m_debug_handle));
m_thread_id = thread_id;
}
/* Set the stop reply packet. */
this->SetStopReplyPacket(GdbSignal_Signal0);
} else {
SetReplyError(m_reply_packet, "E01");
}
} else {
SetReplyError(m_reply_packet, "E01");
}
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} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::q() {
if (ParsePrefix(m_receive_packet, "qAttached:")) {
this->qAttached();
} else if (ParsePrefix(m_receive_packet, "qC")) {
this->qC();
} else if (ParsePrefix(m_receive_packet, "qSupported:")) {
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this->qSupported();
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} else if (ParsePrefix(m_receive_packet, "qXfer:")) {
this->qXfer();
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} else {
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented q: %s\n", m_receive_packet);
}
}
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void GdbServerImpl::qAttached() {
if (this->HasDebugProcess()) {
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/* Parse/Save the requested process id */
if (const char *colon = std::strchr(m_receive_packet, ':'); colon != nullptr) {
m_target_process_id.value = DecodeHex(colon + 1);
AMS_DMNT2_GDB_LOG_DEBUG("Queried for attached to %016lx\n", m_target_process_id.value);
}
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SetReply(m_reply_packet, "1");
} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::qC() {
if (this->HasDebugProcess()) {
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/* Potentially get our thread id. */
if (m_thread_id == 0) {
s32 dummy;
u64 thread_id = 0;
if (R_FAILED(svc::GetThreadList(std::addressof(dummy), std::addressof(thread_id), 1, m_debug_handle))) {
SetReplyError(m_reply_packet, "E01");
return;
}
m_thread_id = thread_id;
}
/* Send the thread id. */
SetReply(m_reply_packet, "QCp%lx.%lx", m_target_process_id.value, m_thread_id);
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} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::qSupported() {
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/* Current string from devkita64-none-elf-gdb: */
/* qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+ */
SetReply(m_reply_packet, "PacketSize=%lx", GdbPacketBufferSize - 1);
AppendReply(m_reply_packet, ";multiprocess+");
AppendReply(m_reply_packet, ";qXfer:osdata:read+");
AppendReply(m_reply_packet, ";qXfer:features:read+");
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AppendReply(m_reply_packet, ";qXfer:libraries-svr4:read+");
AppendReply(m_reply_packet, ";augmented-libraries-svr4-read+");
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AppendReply(m_reply_packet, ";qXfer:threads:read+");
AppendReply(m_reply_packet, ";swbreak+");
AppendReply(m_reply_packet, ";hwbreak+");
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AppendReply(m_reply_packet, ";vContSupported+");
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}
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void GdbServerImpl::qXfer() {
/* Check for osdata. */
if (ParsePrefix(m_receive_packet, "osdata:read:")) {
this->qXferOsdataRead();
} else {
/* All other qXfer require debug process. */
if (!this->HasDebugProcess()) {
SetReplyError(m_reply_packet, "E01");
return;
}
/* Process. */
if (ParsePrefix(m_receive_packet, "features:read:")) {
this->qXferFeaturesRead();
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} else if (ParsePrefix(m_receive_packet, "threads:read:")) {
if (!this->qXferThreadsRead()) {
m_killed = true;
SetReplyError(m_reply_packet, "E01");
}
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} else {
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented qxfer: %s\n", m_receive_packet);
SetReplyError(m_reply_packet, "E01");
}
}
}
void GdbServerImpl::qXferFeaturesRead() {
/* Handle the qXfer. */
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u32 offset, length;
if (ParsePrefix(m_receive_packet, "target.xml:")) {
/* Parse offset/length. */
ParseOffsetLength(m_receive_packet, offset, length);
/* Send the desired xml. */
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/* TODO: Detection of debug-process as 64 bit or not. */
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std::strncpy(m_reply_packet, (this->Is64Bit() ? TargetXmlAarch64 : TargetXmlAarch32) + offset, length);
m_reply_packet[length] = 0;
m_reply_packet += std::strlen(m_reply_packet);
} else if (ParsePrefix(m_receive_packet, "aarch64-core.xml:")) {
/* Parse offset/length. */
ParseOffsetLength(m_receive_packet, offset, length);
/* Send the desired xml. */
std::strncpy(m_reply_packet, Aarch64CoreXml + offset, length);
m_reply_packet[length] = 0;
m_reply_packet += std::strlen(m_reply_packet);
} else if (ParsePrefix(m_receive_packet, "aarch64-fpu.xml:")) {
/* Parse offset/length. */
ParseOffsetLength(m_receive_packet, offset, length);
/* Send the desired xml. */
std::strncpy(m_reply_packet, Aarch64FpuXml + offset, length);
m_reply_packet[length] = 0;
m_reply_packet += std::strlen(m_reply_packet);
} else if (ParsePrefix(m_receive_packet, "arm-core.xml:")) {
/* Parse offset/length. */
ParseOffsetLength(m_receive_packet, offset, length);
/* Send the desired xml. */
std::strncpy(m_reply_packet, ArmCoreXml + offset, length);
m_reply_packet[length] = 0;
m_reply_packet += std::strlen(m_reply_packet);
} else if (ParsePrefix(m_receive_packet, "arm-vfp.xml:")) {
/* Parse offset/length. */
ParseOffsetLength(m_receive_packet, offset, length);
/* Send the desired xml. */
std::strncpy(m_reply_packet, ArmVfpXml + offset, length);
m_reply_packet[length] = 0;
m_reply_packet += std::strlen(m_reply_packet);
} else {
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented qxfer:features:read: %s\n", m_receive_packet);
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SetReplyError(m_reply_packet, "E01");
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}
}
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void GdbServerImpl::qXferOsdataRead() {
/* Handle the qXfer. */
u32 offset, length;
if (ParsePrefix(m_receive_packet, "processes:")) {
/* Parse offset/length. */
ParseOffsetLength(m_receive_packet, offset, length);
/* If doing a fresh read, generate the process list. */
if (offset == 0) {
/* Clear the process list buffer. */
g_process_list_buffer[0] = 0;
/* Set header. */
SetReply(g_process_list_buffer, "<?xml version=\"1.0\"?>\n<!DOCTYPE target SYSTEM \"osdata.dtd\">\n<osdata type=\"processes\">\n");
/* Get all processes. */
{
/* Get all process ids. */
u64 process_ids[0x50];
s32 num_process_ids;
R_ABORT_UNLESS(svc::GetProcessList(std::addressof(num_process_ids), process_ids, util::size(process_ids)));
/* Send all processes. */
for (s32 i = 0; i < num_process_ids; ++i) {
svc::Handle handle;
if (R_SUCCEEDED(svc::DebugActiveProcess(std::addressof(handle), process_ids[i]))) {
ON_SCOPE_EXIT { R_ABORT_UNLESS(svc::CloseHandle(handle)); };
/* Get the create process event. */
svc::DebugEventInfo d;
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R_ABORT_UNLESS(svc::GetDebugEvent(std::addressof(d), handle));
AMS_ABORT_UNLESS(d.type == svc::DebugEvent_CreateProcess);
AppendReply(g_process_list_buffer, "<item>\n<column name=\"pid\">%lu</column>\n<column name=\"command\">%s</column>\n</item>\n", d.info.create_process.process_id, d.info.create_process.name);
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}
}
}
/* Set footer. */
AppendReply(g_process_list_buffer, "</osdata>");
}
/* Copy out the process list. */
const u32 annex_len = std::strlen(g_process_list_buffer);
if (offset <= annex_len) {
if (offset + length < annex_len) {
m_reply_packet[0] = 'm';
std::memcpy(m_reply_packet + 1, g_process_list_buffer + offset, length);
m_reply_packet[1 + length] = 0;
} else {
const auto size = annex_len - offset;
m_reply_packet[0] = 'l';
std::memcpy(m_reply_packet + 1, g_process_list_buffer + offset, size);
m_reply_packet[1 + size] = 0;
}
} else {
SetReply(m_reply_packet, "l");
}
} else {
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented qxfer:osdata:read: %s\n", m_receive_packet);
SetReplyError(m_reply_packet, "E01");
}
}
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bool GdbServerImpl::qXferThreadsRead() {
/* Set header. */
SetReply(m_reply_packet, "l<threads>");
/* Get thread list. */
s32 num_threads;
u64 thread_ids[0x80];
if (R_FAILED(svc::GetThreadList(std::addressof(num_threads), thread_ids, util::size(thread_ids), m_debug_handle))) {
return false;
}
/* Cap thread limit at 128. */
if (num_threads > 0x80) {
num_threads = 0x80;
}
/* Add all threads. */
for (s32 i = 0; i < num_threads; ++i) {
const auto thread_id = thread_ids[num_threads - 1 - i];
/* Check that we can get the thread context. */
svc::ThreadContext thread_context;
if (R_FAILED(svc::GetDebugThreadContext(std::addressof(thread_context), m_debug_handle, thread_id, svc::ThreadContextFlag_All))) {
continue;
}
/* Get the thread core. */
u32 core = 0;
{
u64 dummy;
u32 val32;
if (R_SUCCEEDED(svc::GetDebugThreadParam(std::addressof(dummy), std::addressof(val32), m_debug_handle, m_thread_id, svc::DebugThreadParam_CurrentCore))) {
core = val32;
}
}
/* TODO: `name=\"%s\"`? */
AppendReply(m_reply_packet, "<thread id=\"p%lx.%lx\" core=\"%u\"/>", m_target_process_id.value, thread_id, core);
}
AppendReply(m_reply_packet, "</threads>");
return true;
}
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void GdbServerImpl::QuestionMark() {
/* TODO */
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented QuestionMark\n");
SetReply(m_reply_packet, "W00");
}
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}
Reference in a new issue Copy permalink