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dmnt: implement remaining basic gdbstub packets

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This commit is contained in:
Michael Scire 2021-07-23 05:29:39 -07:00
parent 252b890a12
commit e34a9ba521
4 changed files with 541 additions and 2 deletions
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9
stratosphere/dmnt.gen2/source/dmnt2_debug_process.cpp
View file

@ -313,6 +313,15 @@ namespace ams::dmnt {
}
}
Result DebugProcess::Terminate() {
if (this->IsValid()) {
R_ABORT_UNLESS(svc::TerminateDebugProcess(m_debug_handle));
this->Detach();
}
return ResultSuccess();
}
void DebugProcess::GetBranchTarget(svc::ThreadContext &ctx, u64 thread_id, u64 &current_pc, u64 &target) {
/* Save pc, in case we modify it. */
const u64 pc = current_pc;

2
stratosphere/dmnt.gen2/source/dmnt2_debug_process.hpp
View file

@ -120,6 +120,8 @@ namespace ams::dmnt {
Result Break();
Result Terminate();
Result SetBreakPoint(uintptr_t address, size_t size, bool is_step);
Result ClearBreakPoint(uintptr_t address, size_t size);

516
stratosphere/dmnt.gen2/source/dmnt2_gdb_server_impl.cpp
View file

@ -344,6 +344,17 @@ namespace ams::dmnt {
*dst = 0;
}
void HexToMemory(void *dst, const char *src, size_t size) {
u8 *dst_u8 = static_cast<u8 *>(dst);
for (size_t i = 0; i < size; ++i) {
u8 v = DecodeHex(*(src++)) << 4;
v |= DecodeHex(*(src++)) & 0xF;
*(dst_u8++) = v;
}
}
void ParseOffsetLength(const char *packet, u32 &offset, u32 &length) {
/* Default to zero. */
offset = 0;
@ -437,7 +448,7 @@ namespace ams::dmnt {
SetGdbRegister32(dst, thread_context.pstate);
/* Copy FPU registers. */
for (size_t i = 0; i < util::size(thread_context.v); ++i) {
for (size_t i = 0; i < util::size(thread_context.v) / 2; ++i) {
SetGdbRegister128(dst, thread_context.v[i]);
}
@ -446,6 +457,313 @@ namespace ams::dmnt {
}
}
void SetGdbRegisterPacket(char *dst, const svc::ThreadContext &thread_context, u64 reg_num, bool is_64_bit) {
/* Clear packet. */
dst[0] = 0;
union {
u32 v32;
u64 v64;
u128 v128;
} v;
size_t reg_size = 0;
if (is_64_bit) {
if (reg_num < 29) {
v.v64 = thread_context.r[reg_num];
reg_size = sizeof(u64);
} else if (reg_num == 29) {
v.v64 = thread_context.fp;
reg_size = sizeof(u64);
} else if (reg_num == 30) {
v.v64 = thread_context.lr;
reg_size = sizeof(u64);
} else if (reg_num == 31) {
v.v64 = thread_context.sp;
reg_size = sizeof(u64);
} else if (reg_num == 32) {
v.v64 = thread_context.pc;
reg_size = sizeof(u64);
} else if (reg_num == 33) {
v.v32 = thread_context.pstate;
reg_size = sizeof(u32);
} else if (reg_num < 66) {
v.v128 = thread_context.v[reg_num - 34];
reg_size = sizeof(u128);
} else if (reg_num == 66) {
v.v32 = thread_context.fpsr;
reg_size = sizeof(u32);
} else if (reg_num == 67) {
v.v32 = thread_context.fpcr;
reg_size = sizeof(u32);
}
} else {
if (reg_num < 15) {
v.v32 = thread_context.r[reg_num];
reg_size = sizeof(u32);
} else if (reg_num == 15) {
v.v32 = thread_context.pc;
reg_size = sizeof(u32);
} else if (reg_num == 25) {
v.v32 = thread_context.pstate;
reg_size = sizeof(u32);
} else if (26 <= reg_num && reg_num < 58) {
const union {
u64 v64[2];
u128 v128;
} fpu_reg = { .v128 = thread_context.v[(reg_num - 26) / 2] };
v.v64 = fpu_reg.v64[(reg_num - 26) % 2];
reg_size = sizeof(u64);
} else if (reg_num == 58) {
const u32 fpscr = (thread_context.fpsr & 0xF80000FF) | (thread_context.fpcr & 0x07FFFF00);
v.v32 = fpscr;
reg_size = sizeof(u32);
}
}
switch (reg_size) {
case sizeof(u32): SetGdbRegister32 (dst, v.v32 ); break;
case sizeof(u64): SetGdbRegister64 (dst, v.v64 ); break;
case sizeof(u128): SetGdbRegister128(dst, v.v128); break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
u64 Aarch32RegisterToAarch64Register(u64 reg_num) {
if (reg_num < 15) {
return reg_num;
} else if (reg_num == 15) {
return 32;
} else if (reg_num == 25) {
return 33;
} else if (26 <= reg_num && reg_num <= 57) {
return 34 + (reg_num - 26);
} else if (reg_num == 58) {
return 66;
} else {
AMS_ABORT("Unknown register number %lu\n", reg_num);
}
}
template<typename IntType> requires std::unsigned_integral<IntType>
util::optional<IntType> ParseGdbRegister(const char *&src) {
union {
IntType v;
u8 bytes[sizeof(v)];
} reg;
for (size_t i = 0; i < util::size(reg.bytes); ++i) {
const auto high = DecodeHex(*(src++));
const auto low = DecodeHex(*(src++));
if (high < 0 || low < 0) {
return util::nullopt;
}
reg.bytes[i] = (high << 4) | low;
}
return reg.v;
}
ALWAYS_INLINE util::optional<u32> ParseGdbRegister32(const char *&src) { return ParseGdbRegister<u32>(src); }
ALWAYS_INLINE util::optional<u64> ParseGdbRegister64(const char *&src) { return ParseGdbRegister<u64>(src); }
ALWAYS_INLINE util::optional<u128> ParseGdbRegister128(const char *&src) { return ParseGdbRegister<u128>(src); }
void ParseGdbRegisterPacket(svc::ThreadContext &thread_context, const char *src, bool is_64_bit) {
if (is_64_bit) {
/* Copy general purpose registers. */
for (size_t i = 0; i < util::size(thread_context.r); ++i) {
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.r[i] = *v;
} else {
return;
}
}
/* Copy special registers. */
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.fp = *v;
} else {
return;
}
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.lr = *v;
} else {
return;
}
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.sp = *v;
} else {
return;
}
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.pc = *v;
} else {
return;
}
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.pstate = *v;
} else {
return;
}
/* Copy FPU registers. */
for (size_t i = 0; i < util::size(thread_context.v); ++i) {
if (const auto v = ParseGdbRegister128(src); v.has_value()) {
thread_context.v[i] = *v;
} else {
return;
}
}
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.fpsr = *v;
} else {
return;
}
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.fpcr = *v;
} else {
return;
}
} else {
/* Copy general purpose registers. */
for (size_t i = 0; i < 15; ++i) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.r[i] = *v;
} else {
return;
}
}
/* Copy special registers. */
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.pc = *v;
} else {
return;
}
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.pstate = *v;
} else {
return;
}
/* Copy FPU registers. */
for (size_t i = 0; i < util::size(thread_context.v) / 2; ++i) {
if (const auto v = ParseGdbRegister128(src); v.has_value()) {
thread_context.v[i] = *v;
} else {
return;
}
}
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.fpsr = *v & 0xF80000FF;
thread_context.fpcr = *v & 0x07FFFF00;
} else {
return;
}
}
}
void ParseGdbRegisterPacket(svc::ThreadContext &thread_context, const char *src, u64 reg_num, bool is_64_bit) {
if (is_64_bit) {
if (reg_num < 29) {
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.r[reg_num] = *v;
}
} else if (reg_num == 29) {
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.fp = *v;
}
} else if (reg_num == 30) {
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.lr = *v;
}
} else if (reg_num == 31) {
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.sp = *v;
}
} else if (reg_num == 32) {
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
thread_context.pc = *v;
}
} else if (reg_num == 33) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.pstate = *v;
}
} else if (reg_num < 66) {
if (const auto v = ParseGdbRegister128(src); v.has_value()) {
thread_context.v[reg_num - 34] = *v;
}
} else if (reg_num == 66) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.fpsr = *v;
}
} else if (reg_num == 67) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.fpcr = *v;
}
}
} else {
if (reg_num < 15) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.r[reg_num] = *v;
}
} else if (reg_num == 15) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.pc = *v;
}
} else if (reg_num == 25) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.pstate = *v;
}
} else if (26 <= reg_num && reg_num < 58) {
union {
u64 v64[2];
u128 v128;
} fpu_reg = { .v128 = thread_context.v[(reg_num - 26) / 2] };
if (const auto v = ParseGdbRegister64(src); v.has_value()) {
fpu_reg.v64[(reg_num - 26) % 2] = *v;
thread_context.v[(reg_num - 26) / 2] = fpu_reg.v128;
}
} else if (reg_num == 58) {
if (const auto v = ParseGdbRegister32(src); v.has_value()) {
thread_context.fpsr = *v & 0xF80000FF;
thread_context.fpcr = *v & 0x07FFFF00;
}
}
}
}
u32 RegisterToContextFlags(u64 reg_num, bool is_64_bit) {
/* Convert register number. */
if (!is_64_bit) {
reg_num = Aarch32RegisterToAarch64Register(reg_num);
}
/* Get flags. */
u32 flags = 0;
if (reg_num < 29) {
flags = svc::ThreadContextFlag_General;
} else if (reg_num < 34) {
flags = svc::ThreadContextFlag_Control;
} else if (reg_num < 66) {
flags = svc::ThreadContextFlag_Fpu;
} else if (reg_num == 66) {
flags = svc::ThreadContextFlag_FpuControl;
}
return flags;
}
constinit os::SdkMutex g_annex_buffer_lock;
constinit char g_annex_buffer[0x8000];
@ -898,15 +1216,36 @@ namespace ams::dmnt {
/* Handle the received packet. */
switch (m_receive_packet[0]) {
case 'D':
this->D();
break;
case 'G':
this->G();
break;
case 'H':
this->H();
break;
case 'M':
this->M();
break;
case 'P':
this->P();
break;
case 'Q':
this->Q();
break;
case 'T':
this->T();
break;
case 'Z':
this->Z();
break;
case 'c':
this->c();
break;
case 'k':
this->k();
break;
case 'g':
if (!this->g()) {
m_killed = true;
@ -915,6 +1254,9 @@ namespace ams::dmnt {
case 'm':
this->m();
break;
case 'p':
this->p();
break;
case 'v':
this->v();
break;
@ -936,6 +1278,36 @@ namespace ams::dmnt {
}
}
void GdbServerImpl::D() {
m_debug_process.Detach();
SetReplyOk(m_reply_packet);
}
void GdbServerImpl::G() {
/* Get thread id. */
u32 thread_id = m_debug_process.GetThreadIdOverride();
if (thread_id == 0 || thread_id == static_cast<u32>(-1)) {
thread_id = m_debug_process.GetLastThreadId();
}
/* Get thread context. */
svc::ThreadContext ctx;
if (R_FAILED(m_debug_process.GetThreadContext(std::addressof(ctx), thread_id, svc::ThreadContextFlag_All))) {
SetReplyError(m_reply_packet, "E01");
return;
}
/* Update the thread context. */
ParseGdbRegisterPacket(ctx, m_receive_packet, m_debug_process.Is64Bit());
/* Set the thread context. */
if (R_SUCCEEDED(m_debug_process.SetThreadContext(std::addressof(ctx), thread_id, svc::ThreadContextFlag_All))) {
SetReplyOk(m_reply_packet);
} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::H() {
if (this->HasDebugProcess()) {
if (ParsePrefix(m_receive_packet, "Hg") || ParsePrefix(m_receive_packet, "HG")) {
@ -982,6 +1354,89 @@ namespace ams::dmnt {
}
}
void GdbServerImpl::M() {
++m_receive_packet;
/* Validate format. */
char *comma = std::strchr(m_receive_packet, ',');
if (comma == nullptr) {
SetReplyError(m_reply_packet, "E01");
return;
}
*comma = 0;
char *colon = std::strchr(comma + 1, ':');
if (colon == nullptr) {
SetReplyError(m_reply_packet, "E01");
return;
}
*colon = 0;
/* Parse address/length. */
const u64 address = DecodeHex(m_receive_packet);
const u64 length = DecodeHex(comma + 1);
if (length >= sizeof(m_buffer)) {
SetReplyError(m_reply_packet, "E01");
return;
}
/* Decode the memory. */
HexToMemory(m_buffer, colon + 1, length);
/* Write the memory. */
if (R_SUCCEEDED(m_debug_process.WriteMemory(m_buffer, address, length))) {
SetReplyOk(m_reply_packet);
} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::P() {
++m_receive_packet;
/* Validate format. */
char *equal = std::strchr(m_receive_packet, '=');
if (equal == nullptr) {
SetReplyError(m_reply_packet, "E01");
return;
}
*equal = 0;
/* Decode the register. */
const u64 reg_num = DecodeHex(m_receive_packet);
/* Get the flags. */
const u32 flags = RegisterToContextFlags(reg_num, m_debug_process.Is64Bit());
/* Determine thread id. */
u32 thread_id = m_debug_process.GetThreadIdOverride();
if (thread_id == 0 || thread_id == static_cast<u32>(-1)) {
thread_id = m_debug_process.GetLastThreadId();
}
/* Update the register. */
svc::ThreadContext ctx;
if (R_SUCCEEDED(m_debug_process.GetThreadContext(std::addressof(ctx), thread_id, flags))) {
ParseGdbRegisterPacket(ctx, equal + 1, reg_num, m_debug_process.Is64Bit());
if (R_SUCCEEDED(m_debug_process.SetThreadContext(std::addressof(ctx), thread_id, flags))) {
SetReplyOk(m_reply_packet);
} else {
SetReplyError(m_reply_packet, "E01");
}
} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::Q() {
if (false) {
/* TODO: QStartNoAckMode? */
} else {
AMS_DMNT2_GDB_LOG_DEBUG("Not Implemented Q: %s\n", m_receive_packet);
}
}
void GdbServerImpl::T() {
if (const char *dot = std::strchr(m_receive_packet, '.'); dot != nullptr) {
const u64 thread_id = DecodeHex(dot + 1);
@ -1082,6 +1537,28 @@ namespace ams::dmnt {
}
}
void GdbServerImpl::c() {
/* Get thread id. */
u64 thread_id = m_debug_process.GetThreadIdOverride();
if (thread_id == 0 || thread_id == static_cast<u64>(-1)) {
thread_id = m_debug_process.GetLastThreadId();
}
/* Continue the thread. */
Result result;
if (thread_id == m_debug_process.GetLastThreadId()) {
result = m_debug_process.Continue(thread_id);
} else {
result = m_debug_process.Continue();
}
if (R_SUCCEEDED(result)) {
SetReplyOk(m_reply_packet);
} else {
SetReplyError(m_reply_packet, "E01");
}
}
bool GdbServerImpl::g() {
/* Get thread id. */
u64 thread_id = m_debug_process.GetThreadIdOverride();
@ -1130,6 +1607,35 @@ namespace ams::dmnt {
MemoryToHex(m_reply_packet, m_buffer, length);
}
void GdbServerImpl::k() {
m_debug_process.Terminate();
m_killed = true;
}
void GdbServerImpl::p() {
++m_receive_packet;
/* Decode the register. */
const u64 reg_num = DecodeHex(m_receive_packet);
/* Get the flags. */
const u32 flags = RegisterToContextFlags(reg_num, m_debug_process.Is64Bit());
/* Determine thread id. */
u32 thread_id = m_debug_process.GetThreadIdOverride();
if (thread_id == 0 || thread_id == static_cast<u32>(-1)) {
thread_id = m_debug_process.GetLastThreadId();
}
/* Get the register. */
svc::ThreadContext ctx;
if (R_SUCCEEDED(m_debug_process.GetThreadContext(std::addressof(ctx), thread_id, flags))) {
SetGdbRegisterPacket(m_reply_packet, ctx, reg_num, m_debug_process.Is64Bit());
} else {
SetReplyError(m_reply_packet, "E01");
}
}
void GdbServerImpl::v() {
if (ParsePrefix(m_receive_packet, "vAttach;")) {
this->vAttach();
@ -1453,7 +1959,13 @@ namespace ams::dmnt {
for (size_t i = 0; i < m_debug_process.GetModuleCount(); ++i) {
AMS_DMNT2_GDB_LOG_DEBUG("Module[%zu]: %p, %s\n", i, reinterpret_cast<void *>(m_debug_process.GetBaseAddress(i)), m_debug_process.GetModuleName(i));
AppendReply(g_annex_buffer, "<library name=\"%s\"><segment address=\"0x%lx\" /></library>", m_debug_process.GetModuleName(i), m_debug_process.GetBaseAddress(i));
const char *module_name = m_debug_process.GetModuleName(i);
const auto name_len = std::strlen(module_name);
if (name_len > 4 && std::strcmp(module_name + name_len - 4, ".elf") != 0 && std::strcmp(module_name + name_len - 4, ".nss") != 0) {
AppendReply(g_annex_buffer, "<library name=\"%s.elf\"><segment address=\"0x%lx\" /></library>", module_name, m_debug_process.GetBaseAddress(i));
} else {
AppendReply(g_annex_buffer, "<library name=\"%s\"><segment address=\"0x%lx\" /></library>", module_name, m_debug_process.GetBaseAddress(i));
}
}
AppendReply(g_annex_buffer, "</library-list>");

16
stratosphere/dmnt.gen2/source/dmnt2_gdb_server_impl.hpp
View file

@ -62,17 +62,33 @@ namespace ams::dmnt {
void ProcessDebugEvents();
void SetStopReplyPacket(GdbSignal signal);
private:
void D();
void G();
void H();
void Hg();
void M();
void P();
void Q();
void T();
void Z();
void c();
bool g();
void k();
void m();
void p();
void v();
void vAttach();