kern/dmnt2: allow retrieval of process info via extension

This also fixes ctrl-c break in gdbstub, and fixes crash on unknown monitor cmd.

libraries/libmesosphere/include/mesosphere/kern_build_config.hpp

@@ -40,6 +40,12 @@
 /* of the right side, and so this does not actually cost any space. */
 #define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST
 
+/* NOTE: This enables usage of KDebug handles as parameter for svc::GetInfo */
+/* calls which require a process parameter. This enables a debugger to obtain */
+/* address space/layout information, for example. However, it changes abi, and so */
+/* this define allows toggling the extension. */
+#define MESOSPHERE_ENABLE_GET_INFO_OF_DEBUG_PROCESS
+
 /* NOTE: This uses currently-reserved bits inside the MapRange capability */
 /* in order to support large physical addresses (40-bit instead of 36). */
 /* This is toggleable in order to disable it if N ever uses those bits. */

libraries/libmesosphere/source/svc/kern_svc_info.cpp

@@ -38,6 +38,80 @@ namespace ams::kern::svc {
             return ResultSuccess();
         }
 
+        Result GetInfoImpl(u64 *out, ams::svc::InfoType info_type, KProcess *process) {
+            switch (info_type) {
+                case ams::svc::InfoType_CoreMask:
+                    *out = process->GetCoreMask();
+                    break;
+                case ams::svc::InfoType_PriorityMask:
+                    *out = process->GetPriorityMask();
+                    break;
+                case ams::svc::InfoType_AliasRegionAddress:
+                    *out = GetInteger(process->GetPageTable().GetAliasRegionStart());
+                    break;
+                case ams::svc::InfoType_AliasRegionSize:
+                    *out = process->GetPageTable().GetAliasRegionSize();
+                    break;
+                case ams::svc::InfoType_HeapRegionAddress:
+                    *out = GetInteger(process->GetPageTable().GetHeapRegionStart());
+                    break;
+                case ams::svc::InfoType_HeapRegionSize:
+                    *out = process->GetPageTable().GetHeapRegionSize();
+                    break;
+                case ams::svc::InfoType_TotalMemorySize:
+                    *out = process->GetTotalUserPhysicalMemorySize();
+                    break;
+                case ams::svc::InfoType_UsedMemorySize:
+                    *out = process->GetUsedUserPhysicalMemorySize();
+                    break;
+                case ams::svc::InfoType_AslrRegionAddress:
+                    *out = GetInteger(process->GetPageTable().GetAliasCodeRegionStart());
+                    break;
+                case ams::svc::InfoType_AslrRegionSize:
+                    *out = process->GetPageTable().GetAliasCodeRegionSize();
+                    break;
+                case ams::svc::InfoType_StackRegionAddress:
+                    *out = GetInteger(process->GetPageTable().GetStackRegionStart());
+                    break;
+                case ams::svc::InfoType_StackRegionSize:
+                    *out = process->GetPageTable().GetStackRegionSize();
+                    break;
+                case ams::svc::InfoType_SystemResourceSizeTotal:
+                    *out = process->GetTotalSystemResourceSize();
+                    break;
+                case ams::svc::InfoType_SystemResourceSizeUsed:
+                    *out = process->GetUsedSystemResourceSize();
+                    break;
+                case ams::svc::InfoType_ProgramId:
+                    *out = process->GetProgramId();
+                    break;
+                case ams::svc::InfoType_UserExceptionContextAddress:
+                    *out = GetInteger(process->GetProcessLocalRegionAddress());
+                    break;
+                case ams::svc::InfoType_TotalNonSystemMemorySize:
+                    *out = process->GetTotalNonSystemUserPhysicalMemorySize();
+                    break;
+                case ams::svc::InfoType_UsedNonSystemMemorySize:
+                    *out = process->GetUsedNonSystemUserPhysicalMemorySize();
+                    break;
+                case ams::svc::InfoType_IsApplication:
+                    *out = process->IsApplication();
+                    break;
+                case ams::svc::InfoType_FreeThreadCount:
+                    if (KResourceLimit *resource_limit = process->GetResourceLimit(); resource_limit != nullptr) {
+                        const auto current_value = resource_limit->GetCurrentValue(ams::svc::LimitableResource_ThreadCountMax);
+                        const auto limit_value   = resource_limit->GetLimitValue(ams::svc::LimitableResource_ThreadCountMax);
+                        *out = limit_value - current_value;
+                    } else {
+                        *out = 0;
+                    }
+                    break;
+                MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
+            }
+
+            return ResultSuccess();
+        }
+
         Result GetInfo(u64 *out, ams::svc::InfoType info_type, ams::svc::Handle handle, u64 info_subtype) {
             switch (info_type) {
                 case ams::svc::InfoType_CoreMask:
@@ -66,77 +140,34 @@ namespace ams::kern::svc {
 
                         /* Get the process from its handle. */
                         KScopedAutoObject process = GetCurrentProcess().GetHandleTable().GetObject<KProcess>(handle);
+
+                        #if defined(MESOSPHERE_ENABLE_GET_INFO_OF_DEBUG_PROCESS)
+                        /* If we the process is valid, use it. */
+                        if (process.IsNotNull()) {
+                            return GetInfoImpl(out, info_type, process.GetPointerUnsafe());
+                        }
+
+                        /* Otherwise, as a mesosphere extension check if we were passed a usable KDebug. */
+                        KScopedAutoObject debug = GetCurrentProcess().GetHandleTable().GetObject<KDebug>(handle);
+                        R_UNLESS(debug.IsNotNull(), svc::ResultInvalidHandle());
+
+                        /* Get the process from the debug object. */
+                        /* TODO: ResultInvalidHandle()? */
+                        R_UNLESS(debug->IsAttached(),  svc::ResultProcessTerminated());
+                        R_UNLESS(debug->OpenProcess(), svc::ResultProcessTerminated());
+
+                        /* Close the process when we're done. */
+                        ON_SCOPE_EXIT { debug->CloseProcess(); };
+
+                        /* Return the info. */
+                        return GetInfoImpl(out, info_type, debug->GetProcessUnsafe());
+                        #else
+                        /* Verify that the process is valid. */
                         R_UNLESS(process.IsNotNull(), svc::ResultInvalidHandle());
 
-                        switch (info_type) {
+                        /* Return the relevant info. */
-                            case ams::svc::InfoType_CoreMask:
+                        return GetInfoImpl(out, info_type, process.GetPointerUnsafe());
-                                *out = process->GetCoreMask();
+                        #endif
-                                break;
-                            case ams::svc::InfoType_PriorityMask:
-                                *out = process->GetPriorityMask();
-                                break;
-                            case ams::svc::InfoType_AliasRegionAddress:
-                                *out = GetInteger(process->GetPageTable().GetAliasRegionStart());
-                                break;
-                            case ams::svc::InfoType_AliasRegionSize:
-                                *out = process->GetPageTable().GetAliasRegionSize();
-                                break;
-                            case ams::svc::InfoType_HeapRegionAddress:
-                                *out = GetInteger(process->GetPageTable().GetHeapRegionStart());
-                                break;
-                            case ams::svc::InfoType_HeapRegionSize:
-                                *out = process->GetPageTable().GetHeapRegionSize();
-                                break;
-                            case ams::svc::InfoType_TotalMemorySize:
-                                *out = process->GetTotalUserPhysicalMemorySize();
-                                break;
-                            case ams::svc::InfoType_UsedMemorySize:
-                                *out = process->GetUsedUserPhysicalMemorySize();
-                                break;
-                            case ams::svc::InfoType_AslrRegionAddress:
-                                *out = GetInteger(process->GetPageTable().GetAliasCodeRegionStart());
-                                break;
-                            case ams::svc::InfoType_AslrRegionSize:
-                                *out = process->GetPageTable().GetAliasCodeRegionSize();
-                                break;
-                            case ams::svc::InfoType_StackRegionAddress:
-                                *out = GetInteger(process->GetPageTable().GetStackRegionStart());
-                                break;
-                            case ams::svc::InfoType_StackRegionSize:
-                                *out = process->GetPageTable().GetStackRegionSize();
-                                break;
-                            case ams::svc::InfoType_SystemResourceSizeTotal:
-                                *out = process->GetTotalSystemResourceSize();
-                                break;
-                            case ams::svc::InfoType_SystemResourceSizeUsed:
-                                *out = process->GetUsedSystemResourceSize();
-                                break;
-                            case ams::svc::InfoType_ProgramId:
-                                *out = process->GetProgramId();
-                                break;
-                            case ams::svc::InfoType_UserExceptionContextAddress:
-                                *out = GetInteger(process->GetProcessLocalRegionAddress());
-                                break;
-                            case ams::svc::InfoType_TotalNonSystemMemorySize:
-                                *out = process->GetTotalNonSystemUserPhysicalMemorySize();
-                                break;
-                            case ams::svc::InfoType_UsedNonSystemMemorySize:
-                                *out = process->GetUsedNonSystemUserPhysicalMemorySize();
-                                break;
-                            case ams::svc::InfoType_IsApplication:
-                                *out = process->IsApplication();
-                                break;
-                            case ams::svc::InfoType_FreeThreadCount:
-                                if (KResourceLimit *resource_limit = process->GetResourceLimit(); resource_limit != nullptr) {
-                                    const auto current_value = resource_limit->GetCurrentValue(ams::svc::LimitableResource_ThreadCountMax);
-                                    const auto limit_value   = resource_limit->GetLimitValue(ams::svc::LimitableResource_ThreadCountMax);
-                                    *out = limit_value - current_value;
-                                } else {
-                                    *out = 0;
-                                }
-                                break;
-                            MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
-                        }
                     }
                     break;
                 case ams::svc::InfoType_DebuggerAttached:

stratosphere/dmnt.gen2/source/dmnt2_debug_process.cpp

@@ -47,6 +47,10 @@ namespace ams::dmnt {
         svc::GetProcessId(std::addressof(pid_value), m_debug_handle);
 
         m_process_id = { pid_value };
+
+        /* Get process info. */
+        this->CollectProcessInfo();
+
         return ResultSuccess();
     }
 
@@ -227,6 +231,53 @@ namespace ams::dmnt {
         return ResultSuccess();
     }
 
+    void DebugProcess::CollectProcessInfo() {
+        /* Define helper for getting process info. */
+        auto CollectProcessInfoImpl = [&](os::NativeHandle handle) -> Result {
+            /* Collect all values. */
+            R_TRY(svc::GetInfo(std::addressof(m_process_alias_address), svc::InfoType_AliasRegionAddress, handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_alias_size),    svc::InfoType_AliasRegionSize,    handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_heap_address),  svc::InfoType_HeapRegionAddress,  handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_heap_size),     svc::InfoType_HeapRegionSize,     handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_aslr_address),  svc::InfoType_AslrRegionAddress,  handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_aslr_size),     svc::InfoType_AslrRegionSize,     handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_stack_address), svc::InfoType_StackRegionAddress, handle, 0));
+            R_TRY(svc::GetInfo(std::addressof(m_process_stack_size),    svc::InfoType_StackRegionSize,    handle, 0));
+
+            if (m_program_location.program_id == ncm::InvalidProgramId) {
+                R_TRY(svc::GetInfo(std::addressof(m_program_location.program_id.value), svc::InfoType_ProgramId, handle, 0));
+            }
+
+            u64 value;
+            R_TRY(svc::GetInfo(std::addressof(value), svc::InfoType_IsApplication, handle, 0));
+            m_is_application = value != 0;
+
+            return ResultSuccess();
+        };
+
+        /* Get process info/status. */
+        os::NativeHandle process_handle;
+        if (R_FAILED(pm::dmnt::AtmosphereGetProcessInfo(std::addressof(process_handle), std::addressof(m_program_location), std::addressof(m_process_override_status), m_process_id))) {
+            process_handle            = os::InvalidNativeHandle;
+            m_program_location        = { ncm::InvalidProgramId, };
+            m_process_override_status = {};
+        }
+        ON_SCOPE_EXIT { os::CloseNativeHandle(process_handle); };
+
+        /* Try collecting from our debug handle, then the process handle. */
+        if (R_FAILED(CollectProcessInfoImpl(m_debug_handle)) && R_FAILED(CollectProcessInfoImpl(process_handle))) {
+            m_process_alias_address = 0;
+            m_process_alias_size    = 0;
+            m_process_heap_address  = 0;
+            m_process_heap_size     = 0;
+            m_process_aslr_address  = 0;
+            m_process_aslr_size     = 0;
+            m_process_stack_address = 0;
+            m_process_stack_size    = 0;
+            m_is_application        = false;
+        }
+    }
+
     Result DebugProcess::GetThreadContext(svc::ThreadContext *out, u64 thread_id, u32 flags) {
         return svc::GetDebugThreadContext(out, m_debug_handle, thread_id, flags);
     }

stratosphere/dmnt.gen2/source/dmnt2_debug_process.hpp

@@ -64,6 +64,17 @@ namespace ams::dmnt {
             ModuleDefinition m_module_definitions[ModuleCountMax]{};
             size_t m_module_count{};
             size_t m_main_module{};
+            u64 m_process_alias_address{};
+            u64 m_process_alias_size{};
+            u64 m_process_heap_address{};
+            u64 m_process_heap_size{};
+            u64 m_process_aslr_address{};
+            u64 m_process_aslr_size{};
+            u64 m_process_stack_address{};
+            u64 m_process_stack_size{};
+            ncm::ProgramLocation m_program_location{};
+            cfg::OverrideStatus m_process_override_status{};
+            bool m_is_application{false};
         public:
             DebugProcess() : m_software_breakpoints(this), m_hardware_breakpoints(this), m_hardware_watchpoints(this), m_step_breakpoints(m_software_breakpoints) {
                 if (svc::IsKernelMesosphere()) {
@@ -108,6 +119,20 @@ namespace ams::dmnt {
             void SetDebugBreaked() {
                 m_status = ProcessStatus_DebugBreak;
             }
+
+            u64 GetAliasRegionAddress() const { return m_process_alias_address; }
+            u64 GetAliasRegionSize()    const { return m_process_alias_size; }
+            u64 GetHeapRegionAddress()  const { return m_process_heap_address; }
+            u64 GetHeapRegionSize()     const { return m_process_heap_size; }
+            u64 GetAslrRegionAddress()  const { return m_process_aslr_address; }
+            u64 GetAslrRegionSize()     const { return m_process_aslr_size; }
+            u64 GetStackRegionAddress() const { return m_process_stack_address; }
+            u64 GetStackRegionSize()    const { return m_process_stack_size; }
+
+            const ncm::ProgramLocation &GetProgramLocation() const { return m_program_location; }
+            const cfg::OverrideStatus &GetOverrideStatus() const { return m_process_override_status; }
+
+            bool IsApplication() const { return m_is_application; }
         public:
             Result Attach(os::ProcessId process_id, bool start_process = false);
             void Detach();
@@ -152,6 +177,8 @@ namespace ams::dmnt {
         private:
             Result Start();
 
+            void CollectProcessInfo();
+
             s32 ThreadCreate(u64 thread_id);
             void ThreadExit(u64 thread_id);
     };

stratosphere/dmnt.gen2/source/dmnt2_gdb_server_impl.cpp

@@ -1209,6 +1209,11 @@ namespace ams::dmnt {
                 /* Send packet. */
                 this->SendPacket(std::addressof(do_break), reply_buffer);
             }
+
+            /* If we should, break the process. */
+            if (do_break) {
+                m_debug_process.Break();
+            }
         }
     }
 
@@ -1855,7 +1860,9 @@ namespace ams::dmnt {
 
     void GdbServerImpl::qRcmd() {
         /* Decode the command. */
-        HexToMemory(m_buffer, m_receive_packet, std::strlen(m_receive_packet));
+        const auto packet_len = std::strlen(m_receive_packet);
+        HexToMemory(m_buffer, m_receive_packet, packet_len);
+        m_buffer[packet_len / 2] = '\x00';
 
         /* Convert our response to hex, on complete. */
         ON_SCOPE_EXIT {
@@ -1866,26 +1873,39 @@ namespace ams::dmnt {
         /* Parse the command. */
         char *command = reinterpret_cast<char *>(m_buffer);
         if (ParsePrefix(command, "help")) {
-            SetReply(m_buffer, "get base\n"
+            SetReply(m_buffer, "get info\n"
                                "wait application\n"
                                "wait {program id}\n"
                                "wait homebrew\n");
-        } else if (ParsePrefix(command, "get base") || ParsePrefix(command, "get modules")) {
+        } else if (ParsePrefix(command, "get base") || ParsePrefix(command, "get info") || ParsePrefix(command, "get modules")) {
-            SetReply(m_buffer, "Modules:\n");
-
             if (!this->HasDebugProcess()) {
-                AppendReply(m_buffer, "    [Not Attached]\n");
+                SetReply(m_buffer, "Not attached.\n");
                 return;
             }
 
+            SetReply(m_buffer, "Process:     0x%lx (%s)\n"
+                               "Program Id:  0x%016lx\n"
+                               "Application: %d\n"
+                               "Hbl:         %d\n"
+                               "Layout:\n", m_process_id.value, m_debug_process.GetProcessName(), m_debug_process.GetProgramLocation().program_id.value, m_debug_process.IsApplication(), m_debug_process.GetOverrideStatus().IsHbl());
+
+            AppendReply(m_buffer, "    Alias: 0x%010lx - 0x%010lx\n"
+                                  "    Heap:  0x%010lx - 0x%010lx\n"
+                                  "    Aslr:  0x%010lx - 0x%010lx\n"
+                                  "    Stack: 0x%010lx - 0x%010lx\n"
+                                  "Modules:\n", m_debug_process.GetAliasRegionAddress(), m_debug_process.GetAliasRegionAddress() + m_debug_process.GetAliasRegionSize() - 1,
+                                                m_debug_process.GetHeapRegionAddress(),  m_debug_process.GetHeapRegionAddress()  + m_debug_process.GetHeapRegionSize()  - 1,
+                                                m_debug_process.GetAslrRegionAddress(),  m_debug_process.GetAslrRegionAddress()  + m_debug_process.GetAslrRegionSize()  - 1,
+                                                m_debug_process.GetStackRegionAddress(), m_debug_process.GetStackRegionAddress() + m_debug_process.GetStackRegionSize() - 1);
+
             /* Get the module list. */
             for (size_t i = 0; i < m_debug_process.GetModuleCount(); ++i) {
                 const char *module_name = m_debug_process.GetModuleName(i);
                 const auto name_len = std::strlen(module_name);
                 if (name_len < 5 || (std::strcmp(module_name + name_len - 4, ".elf") != 0 && std::strcmp(module_name + name_len - 4, ".nss") != 0)) {
-                    AppendReply(m_buffer, "    %p - %p %s.elf\n", reinterpret_cast<void *>(m_debug_process.GetModuleBaseAddress(i)), reinterpret_cast<void *>(m_debug_process.GetModuleBaseAddress(i) + m_debug_process.GetModuleSize(i) - 1), module_name);
+                    AppendReply(m_buffer, "    0x%010lx - 0x%010lx %s.elf\n", m_debug_process.GetModuleBaseAddress(i), m_debug_process.GetModuleBaseAddress(i) + m_debug_process.GetModuleSize(i) - 1, module_name);
                 } else {
-                    AppendReply(m_buffer, "    %p - %p %s\n", reinterpret_cast<void *>(m_debug_process.GetModuleBaseAddress(i)), reinterpret_cast<void *>(m_debug_process.GetModuleBaseAddress(i) + m_debug_process.GetModuleSize(i) - 1), module_name);
+                    AppendReply(m_buffer, "    0x%010lx - 0x%010lx %s\n", m_debug_process.GetModuleBaseAddress(i), m_debug_process.GetModuleBaseAddress(i) + m_debug_process.GetModuleSize(i) - 1, module_name);
                 }
             }
         } else if (ParsePrefix(command, "wait application") || ParsePrefix(command, "wait app")) {
@@ -1916,7 +1936,8 @@ namespace ams::dmnt {
 
             SetReply(m_buffer, "[TODO] wait for program id 0x%lx\n", program_id);
         } else {
-            SetReply(m_buffer, "Unknown command `%s`\n", command);
+            SetReply(m_reply_packet, "Unknown command `%s`\n", command);
+            std::memcpy(m_buffer, m_reply_packet, std::strlen(m_reply_packet));
         }
     }