mirror of
https://github.com/switchbrew/nx-hbloader.git
synced 2025-06-20 21:12:39 +02:00
533 lines
18 KiB
C
533 lines
18 KiB
C
#include <switch.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define DEFAULT_NRO "sdmc:/hbmenu.nro"
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const char g_noticeText[] =
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"nx-hbloader " VERSION "\0"
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"Do you mean to tell me that you're thinking seriously of building that way, when and if you are an architect?";
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static char g_argv[2048];
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static char g_nextArgv[2048];
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static char g_nextNroPath[512];
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u64 g_nroAddr = 0;
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static u64 g_nroSize = 0;
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static NroHeader g_nroHeader;
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static bool g_isApplication = 0;
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static bool g_isAutomaticGameplayRecording = 0;
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static enum {
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CodeMemoryUnavailable = 0,
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CodeMemoryForeignProcess = BIT(0),
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CodeMemorySameProcess = BIT(0) | BIT(1),
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} g_codeMemoryCapability = CodeMemoryUnavailable;
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static Handle g_procHandle;
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static void* g_heapAddr;
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static size_t g_heapSize;
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static u64 g_appletHeapSize = 0;
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static u64 g_appletHeapReservationSize = 0;
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static u128 g_userIdStorage;
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static u8 g_savedTls[0x100];
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// Minimize fs resource usage
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u32 __nx_fs_num_sessions = 1;
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u32 __nx_fsdev_direntry_cache_size = 1;
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bool __nx_fsdev_support_cwd = false;
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// Used by trampoline.s
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Result g_lastRet = 0;
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void NX_NORETURN nroEntrypointTrampoline(const ConfigEntry* entries, u64 handle, u64 entrypoint);
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void __libnx_initheap(void)
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{
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static char g_innerheap[0x4000];
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extern char* fake_heap_start;
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extern char* fake_heap_end;
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fake_heap_start = &g_innerheap[0];
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fake_heap_end = &g_innerheap[sizeof g_innerheap];
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}
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static Result readSetting(const char* key, void* buf, size_t size)
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{
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Result rc;
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u64 actual_size;
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const char* const section_name = "hbloader";
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rc = setsysGetSettingsItemValueSize(section_name, key, &actual_size);
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if (R_SUCCEEDED(rc) && actual_size != size)
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rc = MAKERESULT(Module_Libnx, LibnxError_BadInput);
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if (R_SUCCEEDED(rc))
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rc = setsysGetSettingsItemValue(section_name, key, buf, size, &actual_size);
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if (R_SUCCEEDED(rc) && actual_size != size)
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rc = MAKERESULT(Module_Libnx, LibnxError_BadInput);
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if (R_FAILED(rc)) memset(buf, 0, size);
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return rc;
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}
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void __appInit(void)
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{
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Result rc;
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// Detect Atmosphère early on. This is required for hosversion logic.
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// In the future, this check will be replaced by detectMesosphere().
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Handle dummy;
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rc = svcConnectToNamedPort(&dummy, "ams");
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u32 ams_flag = (R_VALUE(rc) != KERNELRESULT(NotFound)) ? BIT(31) : 0;
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if (R_SUCCEEDED(rc))
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svcCloseHandle(dummy);
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rc = smInitialize();
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 1));
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rc = setsysInitialize();
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if (R_SUCCEEDED(rc)) {
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SetSysFirmwareVersion fw;
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rc = setsysGetFirmwareVersion(&fw);
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if (R_SUCCEEDED(rc))
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hosversionSet(ams_flag | MAKEHOSVERSION(fw.major, fw.minor, fw.micro));
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readSetting("applet_heap_size", &g_appletHeapSize, sizeof(g_appletHeapSize));
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readSetting("applet_heap_reservation_size", &g_appletHeapReservationSize, sizeof(g_appletHeapReservationSize));
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setsysExit();
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}
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rc = fsInitialize();
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 2));
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}
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void __wrap_exit(void)
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{
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// exit() effectively never gets called, so let's stub it out.
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 39));
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}
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static u64 calculateMaxHeapSize(void)
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{
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u64 size = 0;
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u64 mem_available = 0, mem_used = 0;
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svcGetInfo(&mem_available, InfoType_TotalMemorySize, CUR_PROCESS_HANDLE, 0);
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svcGetInfo(&mem_used, InfoType_UsedMemorySize, CUR_PROCESS_HANDLE, 0);
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if (mem_available > mem_used+0x200000)
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size = (mem_available - mem_used - 0x200000) & ~0x1FFFFF;
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if (size == 0)
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size = 0x2000000*16;
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if (size > 0x6000000 && g_isAutomaticGameplayRecording)
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size -= 0x6000000;
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return size;
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}
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static void setupHbHeap(void)
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{
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void* addr = NULL;
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u64 size = calculateMaxHeapSize();
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if (!g_isApplication) {
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if (g_appletHeapSize) {
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u64 requested_size = (g_appletHeapSize + 0x1FFFFF) &~ 0x1FFFFF;
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if (requested_size < size)
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size = requested_size;
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}
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else if (g_appletHeapReservationSize) {
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u64 reserved_size = (g_appletHeapReservationSize + 0x1FFFFF) &~ 0x1FFFFF;
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if (reserved_size < size)
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size -= reserved_size;
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}
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}
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Result rc = svcSetHeapSize(&addr, size);
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if (R_FAILED(rc) || addr==NULL)
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 9));
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g_heapAddr = addr;
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g_heapSize = size;
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}
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static void procHandleReceiveThread(void* arg)
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{
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Handle session = (Handle)(uintptr_t)arg;
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Result rc;
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void* base = armGetTls();
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hipcMakeRequestInline(base);
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s32 idx = 0;
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rc = svcReplyAndReceive(&idx, &session, 1, INVALID_HANDLE, UINT64_MAX);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 15));
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HipcParsedRequest r = hipcParseRequest(base);
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if (r.meta.num_copy_handles != 1)
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 17));
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g_procHandle = r.data.copy_handles[0];
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svcCloseHandle(session);
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}
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// Sets g_isApplication if the hbloader process is running as an Application.
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static void getIsApplication(void)
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{
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Result rc;
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// Try asking the kernel directly (only works on [9.0.0+] or mesosphère)
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u64 flag=0;
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rc = svcGetInfo(&flag, InfoType_IsApplication, CUR_PROCESS_HANDLE, 0);
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if (R_SUCCEEDED(rc)) {
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g_isApplication = flag!=0;
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return;
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}
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// Retrieve our process' PID
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u64 cur_pid=0;
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rc = svcGetProcessId(&cur_pid, CUR_PROCESS_HANDLE);
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if (R_FAILED(rc)) diagAbortWithResult(rc); // shouldn't happen
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// Try reading the current application PID through pm:shell - if it matches ours then we are indeed an application
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rc = pmshellInitialize();
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if (R_SUCCEEDED(rc)) {
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u64 app_pid=0;
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rc = pmshellGetApplicationProcessIdForShell(&app_pid);
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pmshellExit();
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if (cur_pid == app_pid)
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g_isApplication = 1;
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}
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}
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// Sets g_isAutomaticGameplayRecording if the current program has automatic gameplay recording enabled in its NACP.
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//Gets the control.nacp for the current program id, and then sets g_isAutomaticGameplayRecording if less memory should be allocated.
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static void getIsAutomaticGameplayRecording(void)
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{
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Result rc;
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// Do nothing if the HOS version predates [4.0.0], or we're not an application.
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if (hosversionBefore(4,0,0) || !g_isApplication)
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return;
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// Retrieve our process' Program ID
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u64 cur_progid=0;
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rc = svcGetInfo(&cur_progid, InfoType_ProgramId, CUR_PROCESS_HANDLE, 0);
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if (R_FAILED(rc)) diagAbortWithResult(rc); // shouldn't happen
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// Try reading our NACP
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rc = nsInitialize();
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if (R_SUCCEEDED(rc)) {
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NsApplicationControlData data; // note: this is 144KB, which still fits comfortably within the 1MB of stack we have
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u64 size=0;
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rc = nsGetApplicationControlData(NsApplicationControlSource_Storage, cur_progid, &data, sizeof(data), &size);
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nsExit();
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if (R_SUCCEEDED(rc) && data.nacp.video_capture == 2)
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g_isAutomaticGameplayRecording = 1;
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}
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}
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static void getOwnProcessHandle(void)
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{
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Result rc;
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Handle server_handle, client_handle;
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rc = svcCreateSession(&server_handle, &client_handle, 0, 0);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 12));
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Thread t;
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rc = threadCreate(&t, &procHandleReceiveThread, (void*)(uintptr_t)server_handle, NULL, 0x1000, 0x20, 0);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 10));
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rc = threadStart(&t);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 13));
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hipcMakeRequestInline(armGetTls(),
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.num_copy_handles = 1,
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).copy_handles[0] = CUR_PROCESS_HANDLE;
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svcSendSyncRequest(client_handle);
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svcCloseHandle(client_handle);
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threadWaitForExit(&t);
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threadClose(&t);
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}
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static bool isKernel5xOrLater(void)
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{
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u64 dummy = 0;
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Result rc = svcGetInfo(&dummy, InfoType_UserExceptionContextAddress, INVALID_HANDLE, 0);
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return R_VALUE(rc) != KERNELRESULT(InvalidEnumValue);
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}
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static bool isKernel4x(void)
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{
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u64 dummy = 0;
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Result rc = svcGetInfo(&dummy, InfoType_InitialProcessIdRange, INVALID_HANDLE, 0);
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return R_VALUE(rc) != KERNELRESULT(InvalidEnumValue);
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}
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static void getCodeMemoryCapability(void)
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{
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if (detectMesosphere()) {
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// Mesosphère allows for same-process code memory usage.
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g_codeMemoryCapability = CodeMemorySameProcess;
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} else if (isKernel5xOrLater()) {
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// On [5.0.0+], the kernel does not allow the creator process of a CodeMemory object
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// to use svcControlCodeMemory on itself, thus returning InvalidMemoryState (0xD401).
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// However the kernel can be patched to support same-process usage of CodeMemory.
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// We can detect that by passing a bad operation and observe if we actually get InvalidEnumValue (0xF001).
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Handle code;
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Result rc = svcCreateCodeMemory(&code, g_heapAddr, 0x1000);
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if (R_SUCCEEDED(rc)) {
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rc = svcControlCodeMemory(code, (CodeMapOperation)-1, 0, 0x1000, 0);
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svcCloseHandle(code);
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if (R_VALUE(rc) == KERNELRESULT(InvalidEnumValue))
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g_codeMemoryCapability = CodeMemorySameProcess;
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else
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g_codeMemoryCapability = CodeMemoryForeignProcess;
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}
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} else if (isKernel4x()) {
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// On [4.0.0-4.1.0] there is no such restriction on same-process CodeMemory usage.
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g_codeMemoryCapability = CodeMemorySameProcess;
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} else {
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// This kernel is too old to support CodeMemory syscalls.
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g_codeMemoryCapability = CodeMemoryUnavailable;
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}
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}
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void loadNro(void)
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{
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NroHeader* header = NULL;
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size_t rw_size=0;
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Result rc=0;
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memcpy((u8*)armGetTls() + 0x100, g_savedTls, 0x100);
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if (g_nroSize > 0)
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{
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// Unmap previous NRO.
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header = &g_nroHeader;
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rw_size = header->segments[2].size + header->bss_size;
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rw_size = (rw_size+0xFFF) & ~0xFFF;
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svcBreak(BreakReason_NotificationOnlyFlag | BreakReason_PreUnloadDll, g_nroAddr, g_nroSize);
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// .text
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rc = svcUnmapProcessCodeMemory(
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g_procHandle, g_nroAddr + header->segments[0].file_off, ((u64) g_heapAddr) + header->segments[0].file_off, header->segments[0].size);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 24));
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// .rodata
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rc = svcUnmapProcessCodeMemory(
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g_procHandle, g_nroAddr + header->segments[1].file_off, ((u64) g_heapAddr) + header->segments[1].file_off, header->segments[1].size);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 25));
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// .data + .bss
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rc = svcUnmapProcessCodeMemory(
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g_procHandle, g_nroAddr + header->segments[2].file_off, ((u64) g_heapAddr) + header->segments[2].file_off, rw_size);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 26));
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svcBreak(BreakReason_NotificationOnlyFlag | BreakReason_PostUnloadDll, g_nroAddr, g_nroSize);
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g_nroAddr = g_nroSize = 0;
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}
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if (g_nextNroPath[0] == '\0')
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{
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memcpy(g_nextNroPath, DEFAULT_NRO, sizeof(DEFAULT_NRO));
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memcpy(g_nextArgv, DEFAULT_NRO, sizeof(DEFAULT_NRO));
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}
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memcpy(g_argv, g_nextArgv, sizeof g_argv);
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svcBreak(BreakReason_NotificationOnlyFlag | BreakReason_PreLoadDll, (uintptr_t)g_argv, sizeof(g_argv));
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uint8_t *nrobuf = (uint8_t*) g_heapAddr;
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NroStart* start = (NroStart*) (nrobuf + 0);
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header = (NroHeader*) (nrobuf + sizeof(NroStart));
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uint8_t* rest = (uint8_t*) (nrobuf + sizeof(NroStart) + sizeof(NroHeader));
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rc = fsdevMountSdmc();
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 404));
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int fd = open(g_nextNroPath, O_RDONLY);
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if (fd < 0)
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 3));
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// Reset NRO path to load hbmenu by default next time.
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g_nextNroPath[0] = '\0';
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if (read(fd, start, sizeof(*start)) != sizeof(*start))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 4));
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if (read(fd, header, sizeof(*header)) != sizeof(*header))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 4));
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if (header->magic != NROHEADER_MAGIC)
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 5));
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size_t rest_size = header->size - (sizeof(NroStart) + sizeof(NroHeader));
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if (read(fd, rest, rest_size) != rest_size)
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 7));
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close(fd);
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fsdevUnmountAll();
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size_t total_size = header->size + header->bss_size;
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total_size = (total_size+0xFFF) & ~0xFFF;
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rw_size = header->segments[2].size + header->bss_size;
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rw_size = (rw_size+0xFFF) & ~0xFFF;
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int i;
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for (i=0; i<3; i++)
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{
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if (header->segments[i].file_off >= header->size || header->segments[i].size > header->size ||
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(header->segments[i].file_off + header->segments[i].size) > header->size)
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{
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 6));
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}
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}
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// todo: Detect whether NRO fits into heap or not.
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// Copy header to elsewhere because we're going to unmap it next.
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memcpy(&g_nroHeader, header, sizeof(g_nroHeader));
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header = &g_nroHeader;
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// Map code memory to a new randomized address
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virtmemLock();
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void* map_addr = virtmemFindCodeMemory(total_size, 0);
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rc = svcMapProcessCodeMemory(g_procHandle, (u64)map_addr, (u64)nrobuf, total_size);
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virtmemUnlock();
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 18));
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// .text
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rc = svcSetProcessMemoryPermission(
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g_procHandle, (u64)map_addr + header->segments[0].file_off, header->segments[0].size, Perm_R | Perm_X);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 19));
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// .rodata
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rc = svcSetProcessMemoryPermission(
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g_procHandle, (u64)map_addr + header->segments[1].file_off, header->segments[1].size, Perm_R);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 20));
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// .data + .bss
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rc = svcSetProcessMemoryPermission(
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g_procHandle, (u64)map_addr + header->segments[2].file_off, rw_size, Perm_Rw);
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if (R_FAILED(rc))
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diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 21));
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u64 nro_size = header->segments[2].file_off + rw_size;
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u64 nro_heap_start = ((u64) g_heapAddr) + nro_size;
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u64 nro_heap_size = g_heapSize + (u64) g_heapAddr - (u64) nro_heap_start;
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#define M EntryFlag_IsMandatory
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static ConfigEntry entries[] = {
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{ EntryType_MainThreadHandle, 0, {0, 0} },
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{ EntryType_ProcessHandle, 0, {0, 0} },
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{ EntryType_AppletType, 0, {AppletType_LibraryApplet, 0} },
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{ EntryType_OverrideHeap, M, {0, 0} },
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{ EntryType_Argv, 0, {0, 0} },
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{ EntryType_NextLoadPath, 0, {0, 0} },
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{ EntryType_LastLoadResult, 0, {0, 0} },
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{ EntryType_SyscallAvailableHint, 0, {UINT64_MAX, UINT64_MAX} },
|
|
{ EntryType_SyscallAvailableHint2, 0, {UINT64_MAX, 0} },
|
|
{ EntryType_RandomSeed, 0, {0, 0} },
|
|
{ EntryType_UserIdStorage, 0, {(u64)(uintptr_t)&g_userIdStorage, 0} },
|
|
{ EntryType_HosVersion, 0, {0, 0} },
|
|
{ EntryType_EndOfList, 0, {(u64)(uintptr_t)g_noticeText, sizeof(g_noticeText)} }
|
|
};
|
|
|
|
ConfigEntry *entry_AppletType = &entries[2];
|
|
ConfigEntry *entry_Syscalls = &entries[7];
|
|
|
|
if (g_isApplication) {
|
|
entry_AppletType->Value[0] = AppletType_SystemApplication;
|
|
entry_AppletType->Value[1] = EnvAppletFlags_ApplicationOverride;
|
|
}
|
|
|
|
if (!(g_codeMemoryCapability & BIT(0))) {
|
|
// Revoke access to svcCreateCodeMemory if it's not available.
|
|
entry_Syscalls->Value[0x4B/64] &= ~(1UL << (0x4B%64));
|
|
}
|
|
|
|
if (!(g_codeMemoryCapability & BIT(1))) {
|
|
// Revoke access to svcControlCodeMemory if it's not available for same-process usage.
|
|
entry_Syscalls->Value[0x4C/64] &= ~(1UL << (0x4C%64)); // svcControlCodeMemory
|
|
}
|
|
|
|
// MainThreadHandle
|
|
entries[0].Value[0] = envGetMainThreadHandle();
|
|
// ProcessHandle
|
|
entries[1].Value[0] = g_procHandle;
|
|
// OverrideHeap
|
|
entries[3].Value[0] = nro_heap_start;
|
|
entries[3].Value[1] = nro_heap_size;
|
|
// Argv
|
|
entries[4].Value[1] = (u64)(uintptr_t)&g_argv[0];
|
|
// NextLoadPath
|
|
entries[5].Value[0] = (u64)(uintptr_t)&g_nextNroPath[0];
|
|
entries[5].Value[1] = (u64)(uintptr_t)&g_nextArgv[0];
|
|
// LastLoadResult
|
|
entries[6].Value[0] = g_lastRet;
|
|
// RandomSeed
|
|
entries[9].Value[0] = randomGet64();
|
|
entries[9].Value[1] = randomGet64();
|
|
// HosVersion
|
|
entries[11].Value[0] = hosversionGet();
|
|
entries[11].Value[1] = hosversionIsAtmosphere() ? 0x41544d4f53504852UL : 0; // 'ATMOSPHR'
|
|
|
|
g_nroAddr = (u64)map_addr;
|
|
g_nroSize = nro_size;
|
|
|
|
svcBreak(BreakReason_NotificationOnlyFlag | BreakReason_PostLoadDll, g_nroAddr, g_nroSize);
|
|
|
|
nroEntrypointTrampoline(&entries[0], -1, g_nroAddr);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
memcpy(g_savedTls, (u8*)armGetTls() + 0x100, 0x100);
|
|
|
|
getIsApplication();
|
|
getIsAutomaticGameplayRecording();
|
|
smExit(); // Close SM as we don't need it anymore.
|
|
setupHbHeap();
|
|
getOwnProcessHandle();
|
|
getCodeMemoryCapability();
|
|
loadNro();
|
|
|
|
diagAbortWithResult(MAKERESULT(Module_HomebrewLoader, 8));
|
|
return 0;
|
|
}
|