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Properly parse incoming hio packet

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This also does kind of a hacky way of sending HIO requests, since we
don't have a direct way of signaling a request should be sent like the
Rosalina implementation.

To improve this, it could probably do some kind of signal sending which
the main run loop handles instead of GDBStub::HandlePacket();
This commit is contained in:
Ian Chamberlain 2022-12-03 16:09:13 -05:00
parent 6f23ee43ae
commit 7de1bf3746
No known key found for this signature in database
GPG key ID: AE5484D09405AA60
4 changed files with 94 additions and 57 deletions
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38
src/core/gdbstub/gdbstub.cpp
View file

@ -262,13 +262,7 @@ static u8 NibbleToHex(u8 n) {
}
}
/**
* Converts input hex string characters into an array of equivalent of u8 bytes.
*
* @param src Pointer to array of output hex string characters.
* @param len Length of src array.
*/
static u32 HexToInt(const u8* src, std::size_t len) {
u32 HexToInt(const u8* src, std::size_t len) {
u32 output = 0;
while (len-- > 0) {
output = (output << 4) | HexCharToValue(src[0]);
@ -319,12 +313,7 @@ static void IntToGdbHex(u8* dest, u32 v) {
}
}
/**
* Convert a gdb-formatted hex string into a u32.
*
* @param src Pointer to hex string.
*/
static u32 GdbHexToInt(const u8* src) {
u32 GdbHexToInt(const u8* src) {
u32 output = 0;
for (int i = 0; i < 8; i += 2) {
@ -348,12 +337,7 @@ static void LongToGdbHex(u8* dest, u64 v) {
}
}
/**
* Convert a gdb-formatted hex string into a u64.
*
* @param src Pointer to hex string.
*/
static u64 GdbHexToLong(const u8* src) {
u64 GdbHexToLong(const u8* src) {
u64 output = 0;
for (int i = 0; i < 16; i += 2) {
@ -1051,6 +1035,12 @@ void HandlePacket() {
return;
}
if (HasHioRequest()) {
const auto reply = BuildHioRequestPacket();
SendReply(reply.data());
return;
}
if (!IsDataAvailable()) {
return;
}
@ -1064,15 +1054,13 @@ void HandlePacket() {
// HACK: instead of polling DebugEvents properly via SVC, just check for
// whether there's a pending a request, and send it if so.
// ...This doesn't seem good enough for the general case
switch (command_buffer[0]) {
case 'c':
case 'C':
case 's':
if (HasHioRequest()) {
const auto reply = BuildHioReply();
SendReply(reply.data());
return;
}
//
;
}
switch (command_buffer[0]) {
@ -1090,7 +1078,7 @@ void HandlePacket() {
LOG_INFO(Debug_GDBStub, "killed by gdb");
return;
case 'F':
if (HandleHioRequest(command_buffer, command_length)) {
if (HandleHioReply(command_buffer, command_length)) {
Continue();
};
break;

23
src/core/gdbstub/gdbstub.h
View file

@ -107,4 +107,27 @@ void SetCpuStepFlag(bool is_step);
* @param trap Trap no.
*/
void SendTrap(Kernel::Thread* thread, int trap);
/**
* Converts input hex string characters into an array of equivalent of u8 bytes.
*
* @param src Pointer to array of output hex string characters.
* @param len Length of src array.
*/
u32 HexToInt(const u8* src, std::size_t len);
/**
* Convert a gdb-formatted hex string into a u32.
*
* @param src Pointer to hex string.
*/
u32 GdbHexToInt(const u8* src);
/**
* Convert a gdb-formatted hex string into a u64.
*
* @param src Pointer to hex string.
*/
u64 GdbHexToLong(const u8* src);
} // namespace GDBStub

82
src/core/gdbstub/hio.cpp
View file

@ -1,3 +1,7 @@
// Copyright 2022 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "core/core.h"
#include "core/gdbstub/gdbstub.h"
#include "core/gdbstub/hio.h"
@ -8,6 +12,7 @@ namespace {
static VAddr current_hio_request_addr;
static PackedGdbHioRequest current_hio_request;
static std::atomic<bool> sent_request{false};
} // namespace
@ -22,35 +27,39 @@ void SetHioRequest(const VAddr addr) {
return;
}
auto& memory = Core::System::GetInstance().Memory();
if (!memory.IsValidVirtualAddress(*Core::System::GetInstance().Kernel().GetCurrentProcess(),
addr)) {
const auto process = Core::System::GetInstance().Kernel().GetCurrentProcess();
if (!Memory::IsValidVirtualAddress(*process, addr)) {
LOG_WARNING(Debug_GDBStub, "Invalid address for HIO request");
return;
}
memory.ReadBlock(addr, &current_hio_request, sizeof(PackedGdbHioRequest));
auto& memory = Core::System::GetInstance().Memory();
memory.ReadBlock(*process, addr, &current_hio_request, sizeof(PackedGdbHioRequest));
// TODO read + check request magic header
current_hio_request_addr = addr;
sent_request = false;
LOG_DEBUG(Debug_GDBStub, "HIO request initiated");
}
bool HandleHioRequest(const u8* const command_buffer, const u32 command_length) {
if (!HasHioRequest()) {
bool HandleHioReply(const u8* const command_buffer, const u32 command_length) {
if (current_hio_request_addr == 0 || !sent_request) {
LOG_WARNING(Debug_GDBStub, "Got HIO reply but never sent a request");
// TODO send error reply packet?
return false;
}
u64 retval{0};
auto* command_pos = command_buffer + 1;
auto* command_pos = command_buffer;
++command_pos;
// TODO: not totally sure what's going on here...
if (*command_pos == 0 || *command_pos == ',') {
// return GDB_ReplyErrno(ctx, EILSEQ);
return false;
} else if (*command_pos == '-') {
}
// Set the sign of the retval
if (*command_pos == '-') {
command_pos++;
current_hio_request.retval = -1;
} else if (*command_pos == '+') {
@ -60,13 +69,13 @@ bool HandleHioRequest(const u8* const command_buffer, const u32 command_length)
current_hio_request.retval = 1;
}
// TODO:
// pos = GDB_ParseHexIntegerList64(&retval, pos, 1, ',');
if (command_pos == nullptr) {
const auto retval_end = std::find(command_pos, command_buffer + command_length, ',');
if (retval_end >= command_buffer + command_length) {
// return GDB_ReplyErrno(ctx, EILSEQ);
return false;
}
u64 retval = (u64)HexToInt(command_pos, retval_end - command_pos);
command_pos = retval_end + 1;
current_hio_request.retval *= retval;
current_hio_request.gdb_errno = 0;
@ -75,13 +84,11 @@ bool HandleHioRequest(const u8* const command_buffer, const u32 command_length)
if (*command_pos != 0) {
u32 errno_;
// GDB protocol technically allows errno to have a +/- prefix but this will never happen.
// TODO:
// pos = GDB_ParseHexIntegerList(&errno_, ++pos, 1, ',');
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;
current_hio_request.gdb_errno = (int)errno_;
if (command_pos == nullptr) {
return false;
// return GDB_ReplyErrno(ctx, EILSEQ);
}
if (*command_pos != 0) {
if (*command_pos != 'C') {
@ -96,24 +103,35 @@ bool HandleHioRequest(const u8* const command_buffer, const u32 command_length)
std::fill(std::begin(current_hio_request.param_format),
std::end(current_hio_request.param_format), 0);
auto& memory = Core::System::GetInstance().Memory();
// should have been checked when we first initialized the request:
assert(memory.IsValidVirtualAddress(*Core::System::GetInstance().Kernel().GetCurrentProcess(),
current_hio_request_addr));
LOG_DEBUG(Debug_GDBStub, "HIO reply: {{retval = {}, errno = {}, ctrl_c = {}}}",
current_hio_request.retval, current_hio_request.gdb_errno,
current_hio_request.ctrl_c);
memory.WriteBlock(current_hio_request_addr, &current_hio_request, sizeof(PackedGdbHioRequest));
const auto process = Core::System::GetInstance().Kernel().GetCurrentProcess();
// 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",
current_hio_request_addr);
return false;
}
auto& memory = Core::System::GetInstance().Memory();
memory.WriteBlock(*process, current_hio_request_addr, &current_hio_request,
sizeof(PackedGdbHioRequest));
current_hio_request = PackedGdbHioRequest{};
current_hio_request_addr = 0;
sent_request = false;
return true;
}
bool HasHioRequest() {
return current_hio_request_addr != 0;
return current_hio_request_addr != 0 && !sent_request;
}
std::string BuildHioReply() {
std::string BuildHioRequestPacket() {
char buf[256 + 1];
char tmp[32 + 1];
u32 nStr = 0;
@ -144,7 +162,11 @@ std::string BuildHioReply() {
strcat(buf, tmp);
}
return std::string{buf, strlen(buf)};
auto packet = std::string{buf, strlen(buf)};
LOG_DEBUG(Debug_GDBStub, "HIO request packet: {}", packet);
sent_request = true;
return packet;
}
} // namespace GDBStub

8
src/core/gdbstub/hio.h
View file

@ -1,3 +1,7 @@
// Copyright 2022 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/common_types.h"
@ -23,10 +27,10 @@ struct PackedGdbHioRequest {
void SetHioRequest(const VAddr address);
bool HandleHioRequest(const u8* const command_buffer, const u32 command_length);
bool HandleHioReply(const u8* const command_buffer, const u32 command_length);
bool HasHioRequest();
std::string BuildHioReply();
std::string BuildHioRequestPacket();
} // namespace GDBStub