gdbstub: read module information from memory layout
This commit is contained in:
Liam
parent
40d4e9543b
commit
3b872b89d1
1 changed files with 118 additions and 47 deletions
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@ -562,6 +562,120 @@ static std::string PaginateBuffer(std::string_view buffer, std::string_view requ
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}
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}
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static VAddr GetModuleEnd(Kernel::KProcessPageTable& page_table, VAddr base) {
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Kernel::KMemoryInfo mem_info;
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Kernel::Svc::MemoryInfo svc_mem_info;
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Kernel::Svc::PageInfo page_info;
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VAddr cur_addr{base};
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// Expect: r-x Code (.text)
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R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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svc_mem_info = mem_info.GetSvcMemoryInfo();
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cur_addr = svc_mem_info.base_address + svc_mem_info.size;
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if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
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svc_mem_info.permission != Kernel::Svc::MemoryPermission::ReadExecute) {
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return cur_addr - 1;
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}
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// Expect: r-- Code (.rodata)
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R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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svc_mem_info = mem_info.GetSvcMemoryInfo();
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cur_addr = svc_mem_info.base_address + svc_mem_info.size;
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if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
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svc_mem_info.permission != Kernel::Svc::MemoryPermission::Read) {
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return cur_addr - 1;
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}
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// Expect: rw- CodeData (.data)
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R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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svc_mem_info = mem_info.GetSvcMemoryInfo();
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cur_addr = svc_mem_info.base_address + svc_mem_info.size;
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return cur_addr - 1;
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}
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static Loader::AppLoader::Modules FindModules(Core::System& system) {
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Loader::AppLoader::Modules modules;
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auto& page_table = system.ApplicationProcess()->GetPageTable();
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auto& memory = system.ApplicationMemory();
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VAddr cur_addr = 0;
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// Look for executable sections in Code or AliasCode regions.
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while (true) {
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Kernel::KMemoryInfo mem_info{};
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Kernel::Svc::PageInfo page_info{};
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R_ASSERT(
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page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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auto svc_mem_info = mem_info.GetSvcMemoryInfo();
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if (svc_mem_info.permission == Kernel::Svc::MemoryPermission::ReadExecute &&
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(svc_mem_info.state == Kernel::Svc::MemoryState::Code ||
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svc_mem_info.state == Kernel::Svc::MemoryState::AliasCode)) {
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// Try to read the module name from its path.
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constexpr s32 PathLengthMax = 0x200;
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struct {
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u32 zero;
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s32 path_length;
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std::array<char, PathLengthMax> path;
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} module_path;
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if (memory.ReadBlock(svc_mem_info.base_address + svc_mem_info.size, &module_path,
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sizeof(module_path))) {
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if (module_path.zero == 0 && module_path.path_length > 0) {
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// Truncate module name.
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module_path.path[PathLengthMax - 1] = '\0';
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// Ignore leading directories.
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char* path_pointer = module_path.path.data();
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for (s32 i = 0; i < std::min(PathLengthMax, module_path.path_length) &&
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module_path.path[i] != '\0';
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i++) {
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if (module_path.path[i] == '/' || module_path.path[i] == '\\') {
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path_pointer = module_path.path.data() + i + 1;
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}
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}
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// Insert output.
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modules.emplace(svc_mem_info.base_address, path_pointer);
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}
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}
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}
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// Check if we're done.
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const uintptr_t next_address = svc_mem_info.base_address + svc_mem_info.size;
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if (next_address <= cur_addr) {
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break;
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}
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cur_addr = next_address;
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}
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return modules;
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}
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static VAddr FindMainModuleEntrypoint(Core::System& system) {
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Loader::AppLoader::Modules modules;
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system.GetAppLoader().ReadNSOModules(modules);
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// Do we have a module named main?
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const auto main = std::find_if(modules.begin(), modules.end(),
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[](const auto& key) { return key.second == "main"; });
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if (main != modules.end()) {
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return main->first;
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}
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// Do we have any loaded executable sections?
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modules = FindModules(system);
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if (!modules.empty()) {
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return modules.begin()->first;
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}
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// As a last resort, use the start of the code region.
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return GetInteger(system.ApplicationProcess()->GetPageTable().GetCodeRegionStart());
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}
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void GDBStub::HandleQuery(std::string_view command) {
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if (command.starts_with("TStatus")) {
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// no tracepoint support
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@ -573,21 +687,10 @@ void GDBStub::HandleQuery(std::string_view command) {
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const auto target_xml{arch->GetTargetXML()};
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SendReply(PaginateBuffer(target_xml, command.substr(30)));
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} else if (command.starts_with("Offsets")) {
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Loader::AppLoader::Modules modules;
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system.GetAppLoader().ReadNSOModules(modules);
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const auto main = std::find_if(modules.begin(), modules.end(),
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[](const auto& key) { return key.second == "main"; });
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if (main != modules.end()) {
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SendReply(fmt::format("TextSeg={:x}", main->first));
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} else {
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SendReply(fmt::format(
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"TextSeg={:x}",
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GetInteger(system.ApplicationProcess()->GetPageTable().GetCodeRegionStart())));
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}
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const auto main_offset = FindMainModuleEntrypoint(system);
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SendReply(fmt::format("TextSeg={:x}", main_offset));
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} else if (command.starts_with("Xfer:libraries:read::")) {
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Loader::AppLoader::Modules modules;
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system.GetAppLoader().ReadNSOModules(modules);
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auto modules = FindModules(system);
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std::string buffer;
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buffer += R"(<?xml version="1.0"?>)";
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@ -727,37 +830,6 @@ static constexpr const char* GetMemoryPermissionString(const Kernel::Svc::Memory
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}
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}
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static VAddr GetModuleEnd(Kernel::KProcessPageTable& page_table, VAddr base) {
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Kernel::KMemoryInfo mem_info;
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Kernel::Svc::MemoryInfo svc_mem_info;
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Kernel::Svc::PageInfo page_info;
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VAddr cur_addr{base};
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// Expect: r-x Code (.text)
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R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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svc_mem_info = mem_info.GetSvcMemoryInfo();
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cur_addr = svc_mem_info.base_address + svc_mem_info.size;
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if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
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svc_mem_info.permission != Kernel::Svc::MemoryPermission::ReadExecute) {
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return cur_addr - 1;
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}
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// Expect: r-- Code (.rodata)
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R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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svc_mem_info = mem_info.GetSvcMemoryInfo();
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cur_addr = svc_mem_info.base_address + svc_mem_info.size;
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if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
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svc_mem_info.permission != Kernel::Svc::MemoryPermission::Read) {
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return cur_addr - 1;
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}
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// Expect: rw- CodeData (.data)
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R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
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svc_mem_info = mem_info.GetSvcMemoryInfo();
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cur_addr = svc_mem_info.base_address + svc_mem_info.size;
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return cur_addr - 1;
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}
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void GDBStub::HandleRcmd(const std::vector<u8>& command) {
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std::string_view command_str{reinterpret_cast<const char*>(&command[0]), command.size()};
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std::string reply;
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@ -784,8 +856,7 @@ void GDBStub::HandleRcmd(const std::vector<u8>& command) {
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reply = "Fastmem is not enabled.\n";
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}
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} else if (command_str == "get info") {
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Loader::AppLoader::Modules modules;
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system.GetAppLoader().ReadNSOModules(modules);
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auto modules = FindModules(system);
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reply = fmt::format("Process: {:#x} ({})\n"
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"Program Id: {:#018x}\n",
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