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Fix some build + impl errors with HIO

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After rebase there were some API changes, also fix continuation logic in
the main gdbstub.
This commit is contained in:
Ian Chamberlain 2023-03-31 14:05:57 -04:00
parent 33dde0d06b
commit 83138e0c63
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GPG Key ID: AE5484D09405AA60
4 changed files with 94 additions and 63 deletions
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24
src/core/gdbstub/gdbstub.cpp
View File

@ -846,7 +846,7 @@ static void ReadMemory() {
MemToGdbHex(reply, data.data(), len);
reply[len * 2] = '\0';
LOG_DEBUG(Debug_GDBStub, "ReadMemory result: {}", reply);
LOG_DEBUG(Debug_GDBStub, "ReadMemory result: {}", (char*)reply);
SendReply(reinterpret_cast<char*>(reply));
}
@ -1038,6 +1038,12 @@ void HandlePacket() {
return;
}
if (HasPendingHioRequest()) {
const auto request_packet = BuildHioRequestPacket();
SendReply(request_packet.data());
return;
}
if (!IsDataAvailable()) {
return;
}
@ -1047,7 +1053,7 @@ void HandlePacket() {
return;
}
LOG_DEBUG(Debug_GDBStub, "Packet: {}", command_buffer[0]);
LOG_DEBUG(Debug_GDBStub, "Packet: {0:d} ('{0:c}')", command_buffer[0]);
switch (command_buffer[0]) {
case 'q':
@ -1065,7 +1071,12 @@ void HandlePacket() {
return;
case 'F':
if (HandleHioReply(command_buffer, command_length)) {
// TODO figure out how to "resume" the last command
// TODO: technically if we were paused when the reply came in, we
// shouldn't continue here. Could recurse back into HandlePacket() maybe??
Continue();
} else {
// TODO reply with errno if relevant. Maybe that code should live in
// HandleHioReply
}
break;
case 'g':
@ -1263,12 +1274,7 @@ void SendTrap(Kernel::Thread* thread, int trap) {
current_thread = thread;
if (HasPendingHioRequest()) {
const auto request_packet = BuildHioRequestPacket();
SendReply(request_packet.data());
} else {
SendSignal(thread, trap);
}
SendSignal(thread, trap);
halt_loop = true;
send_trap = false;

127
src/core/gdbstub/hio.cpp
View File

@ -2,6 +2,8 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <fmt/ranges.h>
#include "common/string_util.h"
#include "core/core.h"
#include "core/gdbstub/gdbstub.h"
#include "core/gdbstub/hio.h"
@ -29,37 +31,40 @@ void SetHioRequest(const VAddr addr) {
return;
}
if (current_hio_request_addr != 0) {
if (HasPendingHioRequest() || WaitingForHioReply()) {
LOG_WARNING(Debug_GDBStub, "HIO requested while already in progress!");
return;
}
auto& memory = Core::System::GetInstance().Memory();
const auto process = Core::System::GetInstance().Kernel().GetCurrentProcess();
if (!Memory::IsValidVirtualAddress(*process, addr)) {
if (!memory.IsValidVirtualAddress(*process, addr)) {
LOG_WARNING(Debug_GDBStub, "Invalid address for HIO request");
return;
}
auto& memory = Core::System::GetInstance().Memory();
memory.ReadBlock(*process, addr, &current_hio_request, sizeof(PackedGdbHioRequest));
if (std::string_view{current_hio_request.magic} != "GDB") {
LOG_WARNING(Debug_GDBStub, "Invalid HIO request sent by application");
std::string_view magic{current_hio_request.magic};
if (magic != "GDB") {
LOG_WARNING(Debug_GDBStub, "Invalid HIO request sent by application: magic '{}'", magic);
current_hio_request_addr = 0;
current_hio_request = {};
request_status = Status::NoRequest;
} else {
LOG_DEBUG(Debug_GDBStub, "HIO request initiated at 0x{:X}", addr);
current_hio_request_addr = addr;
request_status = Status::NotSent;
// Now halt, so that no further instructions are executed until the request
// is processed by the client. We auto-continue after the reply comes back
Break();
SetCpuHaltFlag(true);
SetCpuStepFlag(false);
Core::GetRunningCore().ClearInstructionCache();
return;
}
LOG_DEBUG(Debug_GDBStub, "HIO request initiated at 0x{:X}", addr);
current_hio_request_addr = addr;
request_status = Status::NotSent;
// Now halt, so that no further instructions are executed until the request
// is processed by the client. We will continue after the reply comes back
Break();
SetCpuHaltFlag(true);
SetCpuStepFlag(false);
Core::GetRunningCore().ClearInstructionCache();
}
bool HandleHioReply(const u8* const command_buffer, const u32 command_length) {
@ -69,6 +74,7 @@ bool HandleHioReply(const u8* const command_buffer, const u32 command_length) {
return false;
}
// Skip 'F' header
auto* command_pos = command_buffer + 1;
if (*command_pos == 0 || *command_pos == ',') {
@ -80,57 +86,65 @@ bool HandleHioReply(const u8* const command_buffer, const u32 command_length) {
if (*command_pos == '-') {
command_pos++;
current_hio_request.retval = -1;
} else if (*command_pos == '+') {
command_pos++;
current_hio_request.retval = 1;
} else {
if (*command_pos == '+') {
command_pos++;
}
current_hio_request.retval = 1;
}
const auto retval_end = std::find(command_pos, command_buffer + command_length, ',');
u64 retval = (u64)HexToInt(command_pos, retval_end - command_pos);
command_pos = retval_end + 1;
const std::string command_str{command_pos, command_buffer + command_length};
std::vector<std::string> command_parts;
Common::SplitString(command_str, ',', command_parts);
current_hio_request.retval *= retval;
current_hio_request.gdb_errno = 0;
current_hio_request.ctrl_c = 0;
if (command_parts.empty() || command_parts.size() > 3) {
LOG_WARNING(Debug_GDBStub, "unexpected reply packet size: {}", command_parts);
// return GDB_ReplyErrno(ctx, EILSEQ);
return false;
}
if (*command_pos != 0) {
u32 errno_;
// GDB protocol technically allows errno to have a +/- prefix but this should never happen.
const auto errno_end = std::find(command_pos, command_buffer + command_length, ',');
errno_ = HexToInt(command_pos, errno_end - command_pos);
command_pos = errno_end + 1;
u64 unsigned_retval = HexToInt((u8*)command_parts[0].data(), command_parts[0].size());
current_hio_request.retval *= unsigned_retval;
current_hio_request.gdb_errno = (int)errno_;
if (command_parts.size() > 1) {
// Technically the errno could be signed but in practice this doesn't happen
current_hio_request.gdb_errno =
HexToInt((u8*)command_parts[1].data(), command_parts[1].size());
} else {
current_hio_request.gdb_errno = 0;
}
if (*command_pos != 0) {
if (*command_pos != 'C') {
return false;
// return GDB_ReplyErrno(ctx, EILSEQ);
}
current_hio_request.ctrl_c = false;
current_hio_request.ctrl_c = true;
if (command_parts.size() > 2 && !command_parts[2].empty()) {
if (command_parts[2][0] != 'C') {
return false;
// return GDB_ReplyErrno(ctx, EILSEQ);
}
// for now we just ignore any trailing ";..." attachments
current_hio_request.ctrl_c = true;
}
std::fill(std::begin(current_hio_request.param_format),
std::end(current_hio_request.param_format), 0);
LOG_DEBUG(Debug_GDBStub, "HIO reply: {{retval = {}, errno = {}, ctrl_c = {}}}",
LOG_TRACE(Debug_GDBStub, "HIO reply: {{retval = {}, errno = {}, ctrl_c = {}}}",
current_hio_request.retval, current_hio_request.gdb_errno,
current_hio_request.ctrl_c);
const auto process = Core::System::GetInstance().Kernel().GetCurrentProcess();
auto& memory = Core::System::GetInstance().Memory();
// should have been checked when we first initialized the request,
// but just double check again before we write to memory
if (!Memory::IsValidVirtualAddress(*process, current_hio_request_addr)) {
LOG_WARNING(Debug_GDBStub, "Invalid address {:X} to write HIO request",
if (!memory.IsValidVirtualAddress(*process, current_hio_request_addr)) {
LOG_WARNING(Debug_GDBStub, "Invalid address {:#X} to write HIO reply",
current_hio_request_addr);
return false;
}
auto& memory = Core::System::GetInstance().Memory();
memory.WriteBlock(*process, current_hio_request_addr, &current_hio_request,
sizeof(PackedGdbHioRequest));
@ -150,38 +164,45 @@ bool WaitingForHioReply() {
}
std::string BuildHioRequestPacket() {
std::stringstream packet;
// TODO:use the IntToGdbHex funcs instead std::hex ?
packet << "F" << current_hio_request.function_name << std::hex;
std::string packet = fmt::format("F{}", current_hio_request.function_name);
// TODO: should we use the IntToGdbHex funcs instead of fmt::format_to ?
u32 nStr = 0;
for (u32 i = 0; i < 8 && current_hio_request.param_format[i] != 0; i++) {
u64 param = current_hio_request.parameters[i];
switch (current_hio_request.param_format[i]) {
case 'i':
case 'I':
case 'p':
packet << "," << (u32)current_hio_request.parameters[i];
break;
// For pointers and 32-bit ints, truncate before sending
param = static_cast<u32>(param);
case 'l':
case 'L':
packet << "," << current_hio_request.parameters[i];
fmt::format_to(std::back_inserter(packet), ",{:x}", param);
break;
case 's':
packet << "," << (u32)current_hio_request.parameters[i] << "/"
<< current_hio_request.string_lengths[nStr++];
// strings are written as {pointer}/{length}
fmt::format_to(std::back_inserter(packet), ",{:x}/{:x}",
(u32)current_hio_request.parameters[i],
current_hio_request.string_lengths[nStr++]);
break;
default:
packet << '\0';
// TODO: early return? Or break out of this loop?
break;
}
}
LOG_DEBUG(Debug_GDBStub, "HIO request packet: {}", packet.str());
LOG_TRACE(Debug_GDBStub, "HIO request packet: {}", packet);
// technically we should set this _after_ the reply is sent...
request_status = Status::SentWaitingReply;
return packet.str();
return packet;
}
} // namespace GDBStub

4
src/core/gdbstub/hio.h
View File

@ -10,6 +10,10 @@
namespace GDBStub {
/**
* Based on the Rosalina implementation:
* https://github.com/LumaTeam/Luma3DS/blob/master/sysmodules/rosalina/include/gdb.h#L46C27-L62
*/
struct PackedGdbHioRequest {
char magic[4]; // "GDB\x00"
u32 version;

2
src/core/hle/kernel/svc.cpp
View File

@ -1144,7 +1144,7 @@ void SVC::Break(u8 break_reason) {
/// Used to output a message on a debug hardware unit, or for the GDB HIO
// protocol - does nothing on a retail unit.
void SVC::OutputDebugString(VAddr address, s32 len) {
if (!Memory::IsValidVirtualAddress(*kernel.GetCurrentProcess(), address)) {
if (!memory.IsValidVirtualAddress(*kernel.GetCurrentProcess(), address)) {
LOG_WARNING(Kernel_SVC, "OutputDebugString called with invalid address {:X}", address);
return;
}