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-rw-r--r--src/core/debugger/gdbstub.cpp165
1 files changed, 118 insertions, 47 deletions
diff --git a/src/core/debugger/gdbstub.cpp b/src/core/debugger/gdbstub.cpp
index e9bf57895..148dd3e39 100644
--- a/src/core/debugger/gdbstub.cpp
+++ b/src/core/debugger/gdbstub.cpp
@@ -562,6 +562,120 @@ static std::string PaginateBuffer(std::string_view buffer, std::string_view requ
}
}
+static VAddr GetModuleEnd(Kernel::KProcessPageTable& page_table, VAddr base) {
+ Kernel::KMemoryInfo mem_info;
+ Kernel::Svc::MemoryInfo svc_mem_info;
+ Kernel::Svc::PageInfo page_info;
+ VAddr cur_addr{base};
+
+ // Expect: r-x Code (.text)
+ R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
+ svc_mem_info = mem_info.GetSvcMemoryInfo();
+ cur_addr = svc_mem_info.base_address + svc_mem_info.size;
+ if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
+ svc_mem_info.permission != Kernel::Svc::MemoryPermission::ReadExecute) {
+ return cur_addr - 1;
+ }
+
+ // Expect: r-- Code (.rodata)
+ R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
+ svc_mem_info = mem_info.GetSvcMemoryInfo();
+ cur_addr = svc_mem_info.base_address + svc_mem_info.size;
+ if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
+ svc_mem_info.permission != Kernel::Svc::MemoryPermission::Read) {
+ return cur_addr - 1;
+ }
+
+ // Expect: rw- CodeData (.data)
+ R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
+ svc_mem_info = mem_info.GetSvcMemoryInfo();
+ cur_addr = svc_mem_info.base_address + svc_mem_info.size;
+ return cur_addr - 1;
+}
+
+static Loader::AppLoader::Modules FindModules(Core::System& system) {
+ Loader::AppLoader::Modules modules;
+
+ auto& page_table = system.ApplicationProcess()->GetPageTable();
+ auto& memory = system.ApplicationMemory();
+ VAddr cur_addr = 0;
+
+ // Look for executable sections in Code or AliasCode regions.
+ while (true) {
+ Kernel::KMemoryInfo mem_info{};
+ Kernel::Svc::PageInfo page_info{};
+ R_ASSERT(
+ page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
+ auto svc_mem_info = mem_info.GetSvcMemoryInfo();
+
+ if (svc_mem_info.permission == Kernel::Svc::MemoryPermission::ReadExecute &&
+ (svc_mem_info.state == Kernel::Svc::MemoryState::Code ||
+ svc_mem_info.state == Kernel::Svc::MemoryState::AliasCode)) {
+ // Try to read the module name from its path.
+ constexpr s32 PathLengthMax = 0x200;
+ struct {
+ u32 zero;
+ s32 path_length;
+ std::array<char, PathLengthMax> path;
+ } module_path;
+
+ if (memory.ReadBlock(svc_mem_info.base_address + svc_mem_info.size, &module_path,
+ sizeof(module_path))) {
+ if (module_path.zero == 0 && module_path.path_length > 0) {
+ // Truncate module name.
+ module_path.path[PathLengthMax - 1] = '\0';
+
+ // Ignore leading directories.
+ char* path_pointer = module_path.path.data();
+
+ for (s32 i = 0; i < std::min(PathLengthMax, module_path.path_length) &&
+ module_path.path[i] != '\0';
+ i++) {
+ if (module_path.path[i] == '/' || module_path.path[i] == '\\') {
+ path_pointer = module_path.path.data() + i + 1;
+ }
+ }
+
+ // Insert output.
+ modules.emplace(svc_mem_info.base_address, path_pointer);
+ }
+ }
+ }
+
+ // Check if we're done.
+ const uintptr_t next_address = svc_mem_info.base_address + svc_mem_info.size;
+ if (next_address <= cur_addr) {
+ break;
+ }
+
+ cur_addr = next_address;
+ }
+
+ return modules;
+}
+
+static VAddr FindMainModuleEntrypoint(Core::System& system) {
+ Loader::AppLoader::Modules modules;
+ system.GetAppLoader().ReadNSOModules(modules);
+
+ // Do we have a module named main?
+ const auto main = std::find_if(modules.begin(), modules.end(),
+ [](const auto& key) { return key.second == "main"; });
+
+ if (main != modules.end()) {
+ return main->first;
+ }
+
+ // Do we have any loaded executable sections?
+ modules = FindModules(system);
+ if (!modules.empty()) {
+ return modules.begin()->first;
+ }
+
+ // As a last resort, use the start of the code region.
+ return GetInteger(system.ApplicationProcess()->GetPageTable().GetCodeRegionStart());
+}
+
void GDBStub::HandleQuery(std::string_view command) {
if (command.starts_with("TStatus")) {
// no tracepoint support
@@ -573,21 +687,10 @@ void GDBStub::HandleQuery(std::string_view command) {
const auto target_xml{arch->GetTargetXML()};
SendReply(PaginateBuffer(target_xml, command.substr(30)));
} else if (command.starts_with("Offsets")) {
- Loader::AppLoader::Modules modules;
- system.GetAppLoader().ReadNSOModules(modules);
-
- const auto main = std::find_if(modules.begin(), modules.end(),
- [](const auto& key) { return key.second == "main"; });
- if (main != modules.end()) {
- SendReply(fmt::format("TextSeg={:x}", main->first));
- } else {
- SendReply(fmt::format(
- "TextSeg={:x}",
- GetInteger(system.ApplicationProcess()->GetPageTable().GetCodeRegionStart())));
- }
+ const auto main_offset = FindMainModuleEntrypoint(system);
+ SendReply(fmt::format("TextSeg={:x}", main_offset));
} else if (command.starts_with("Xfer:libraries:read::")) {
- Loader::AppLoader::Modules modules;
- system.GetAppLoader().ReadNSOModules(modules);
+ auto modules = FindModules(system);
std::string buffer;
buffer += R"(<?xml version="1.0"?>)";
@@ -727,37 +830,6 @@ static constexpr const char* GetMemoryPermissionString(const Kernel::Svc::Memory
}
}
-static VAddr GetModuleEnd(Kernel::KProcessPageTable& page_table, VAddr base) {
- Kernel::KMemoryInfo mem_info;
- Kernel::Svc::MemoryInfo svc_mem_info;
- Kernel::Svc::PageInfo page_info;
- VAddr cur_addr{base};
-
- // Expect: r-x Code (.text)
- R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
- svc_mem_info = mem_info.GetSvcMemoryInfo();
- cur_addr = svc_mem_info.base_address + svc_mem_info.size;
- if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
- svc_mem_info.permission != Kernel::Svc::MemoryPermission::ReadExecute) {
- return cur_addr - 1;
- }
-
- // Expect: r-- Code (.rodata)
- R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
- svc_mem_info = mem_info.GetSvcMemoryInfo();
- cur_addr = svc_mem_info.base_address + svc_mem_info.size;
- if (svc_mem_info.state != Kernel::Svc::MemoryState::Code ||
- svc_mem_info.permission != Kernel::Svc::MemoryPermission::Read) {
- return cur_addr - 1;
- }
-
- // Expect: rw- CodeData (.data)
- R_ASSERT(page_table.QueryInfo(std::addressof(mem_info), std::addressof(page_info), cur_addr));
- svc_mem_info = mem_info.GetSvcMemoryInfo();
- cur_addr = svc_mem_info.base_address + svc_mem_info.size;
- return cur_addr - 1;
-}
-
void GDBStub::HandleRcmd(const std::vector<u8>& command) {
std::string_view command_str{reinterpret_cast<const char*>(&command[0]), command.size()};
std::string reply;
@@ -784,8 +856,7 @@ void GDBStub::HandleRcmd(const std::vector<u8>& command) {
reply = "Fastmem is not enabled.\n";
}
} else if (command_str == "get info") {
- Loader::AppLoader::Modules modules;
- system.GetAppLoader().ReadNSOModules(modules);
+ auto modules = FindModules(system);
reply = fmt::format("Process: {:#x} ({})\n"
"Program Id: {:#018x}\n",
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 12:06:45 +0100