mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-11-24 18:43:03 +00:00
fusee_cpp: implement package2 rebuild/kip patching
This commit is contained in:
parent
968ced677e
commit
e5106ffa2c
10 changed files with 330 additions and 19 deletions
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@ -98,7 +98,10 @@ else
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DEPENDS := $(OFILES:.o=.d)
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all : $(OUTPUT).kip
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all : $(OUTPUT)_unpacked.kip
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$(OUTPUT)_unpacked.kip : $(OUTPUT).kip
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@hactool -t kip --uncompressed=$(OUTPUT)_unpacked.kip $(OUTPUT).kip
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$(OUTPUT).kip : $(OUTPUT).elf
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@ -154,8 +154,11 @@ namespace ams::secmon::boot {
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bool VerifyPackage2Payloads(const pkg2::Package2Meta &meta, uintptr_t payload_address) {
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/* Verify hashes match for all payloads. */
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for (int i = 0; i < pkg2::PayloadCount; ++i) {
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if (!VerifyHash(meta.payload_hashes[i], payload_address, meta.payload_sizes[i])) {
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return false;
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/* Allow all-zero bytes to match any payload. */
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if (!(meta.payload_hashes[i][0] == 0 && std::memcmp(meta.payload_hashes[i] + 0, meta.payload_hashes[i] + 1, sizeof(meta.payload_hashes[i]) - 1) == 0)) {
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if (!VerifyHash(meta.payload_hashes[i], payload_address, meta.payload_sizes[i])) {
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return false;
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}
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}
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payload_address += meta.payload_sizes[i];
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@ -129,6 +129,9 @@ namespace ams::nxboot {
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/* Restore memory clock rate. */
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RestoreMemoryClockRate();
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/* Restore secure monitor code. */
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RestoreSecureMonitorOverlay();
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/* Finalize display. */
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FinalizeDisplay();
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@ -22,6 +22,8 @@ namespace ams::nxboot {
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namespace {
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constinit u8 g_secmon_debug_storage[secmon::MemoryRegionPhysicalIramSecureMonitorDebug.GetSize()];
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ALWAYS_INLINE void *GetOverlayDestination() {
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return reinterpret_cast<void *>(0x4002C000);
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}
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@ -64,7 +66,7 @@ namespace ams::nxboot {
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/* NOTE: Erista does not do memory clock restoration. */
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/* std::memcpy(const_cast<u8 *>(GetSecondaryArchive().ovl_mtc_erista), GetOverlayDestination(), sizeof(SecondaryArchive{}.ovl_mtc_erista)); */
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} else /* if (fuse::GetSocType() == fuse::SocType_Mariko) */ {
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std::memcpy(const_cast<u8 *>(GetSecondaryArchive().ovl_mtc_mariko), GetOverlayDestination(), sizeof(SecondaryArchive{}.ovl_mtc_mariko));
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std::memcpy(const_cast<u8 *>(GetSecondaryArchive().ovl_mtc_mariko), GetOverlayDestination(), sizeof(SecondaryArchive{}.ovl_mtc_mariko) - 0x2000);
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}
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}
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@ -73,7 +75,16 @@ namespace ams::nxboot {
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/* NOTE: Erista does not do memory clock restoration. */
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/* std::memcpy(GetOverlayDestination(), GetSecondaryArchive().ovl_mtc_erista, sizeof(SecondaryArchive{}.ovl_mtc_erista)); */
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} else /* if (fuse::GetSocType() == fuse::SocType_Mariko) */ {
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std::memcpy(GetOverlayDestination(), GetSecondaryArchive().ovl_mtc_mariko, sizeof(SecondaryArchive{}.ovl_mtc_mariko));
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std::memcpy(g_secmon_debug_storage, secmon::MemoryRegionPhysicalIramSecureMonitorDebug.GetPointer<void>(), sizeof(g_secmon_debug_storage));
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std::memcpy(GetOverlayDestination(), GetSecondaryArchive().ovl_mtc_mariko, sizeof(SecondaryArchive{}.ovl_mtc_mariko) - 0x2000);
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}
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}
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void RestoreSecureMonitorOverlay() {
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if (fuse::GetSocType() == fuse::SocType_Erista) {
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/* NOTE: Erista does not do memory clock restoration. */
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} else /* if (fuse::GetSocType() == fuse::SocType_Mariko) */ {
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std::memcpy(secmon::MemoryRegionPhysicalIramSecureMonitorDebug.GetPointer<void>(), g_secmon_debug_storage, sizeof(g_secmon_debug_storage));
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}
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}
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@ -28,5 +28,6 @@ namespace ams::nxboot {
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void SaveMemoryTrainingOverlay();
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void RestoreMemoryTrainingOverlay();
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void RestoreSecureMonitorOverlay();
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}
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@ -47,8 +47,9 @@ namespace ams::nxboot {
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u32 reserved0; /* Previously entrypoint. */
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u32 metadata_offset;
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u32 flags;
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u32 meso_size;
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u32 num_kips;
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u32 reserved1[4];
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u32 reserved1[3];
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u32 magic;
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u32 total_size;
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u32 reserved2; /* Previously crt0 offset. */
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@ -834,7 +834,8 @@ namespace ams::nxboot {
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/* Build modified package2. */
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RebuildPackage2(target_firmware, emummc_enabled);
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WaitForReboot();
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/* Wait for confirmation that exosphere is ready. */
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WaitSecureMonitorState(pkg1::SecureMonitorState_Initialized);
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}
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}
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@ -85,6 +85,8 @@ namespace ams::nxboot {
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static_assert(sizeof(InitialProcessMeta) == 0x40);
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static_assert(alignof(InitialProcessMeta) == 0x10);
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constexpr inline const u64 FsProgramId = 0x0100000000000000;
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enum FsVersion {
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FsVersion_1_0_0 = 0,
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@ -284,6 +286,11 @@ namespace ams::nxboot {
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}
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bool AddInitialProcess(const InitialProcessHeader *kip, const se::Sha256Hash *hash = nullptr) {
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/* Check kip magic. */
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if (kip->magic != InitialProcessHeader::Magic) {
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ShowFatalError("KIP seems corrupted!\n");
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}
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/* Handle the initial case. */
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if (g_initial_process_binary_size == 0) {
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AddInitialProcessImpl(std::addressof(g_initial_process_meta), kip, hash);
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@ -591,6 +598,60 @@ namespace ams::nxboot {
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}
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}
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struct BlzSegmentFlags {
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using Offset = util::BitPack16::Field<0, 12, u32>;
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using Size = util::BitPack16::Field<Offset::Next, 4, u32>;
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};
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void BlzUncompress(void *_end) {
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/* Parse the footer, endian agnostic. */
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static_assert(sizeof(u32) == 4);
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static_assert(sizeof(u16) == 2);
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static_assert(sizeof(u8) == 1);
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u8 *end = static_cast<u8 *>(_end);
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const u32 total_size = (end[-12] << 0) | (end[-11] << 8) | (end[-10] << 16) | (end[- 9] << 24);
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const u32 footer_size = (end[- 8] << 0) | (end[- 7] << 8) | (end[- 6] << 16) | (end[- 5] << 24);
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const u32 additional_size = (end[- 4] << 0) | (end[- 3] << 8) | (end[- 2] << 16) | (end[- 1] << 24);
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/* Prepare to decompress. */
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u8 *cmp_start = end - total_size;
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u32 cmp_ofs = total_size - footer_size;
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u32 out_ofs = total_size + additional_size;
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/* Decompress. */
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while (out_ofs) {
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u8 control = cmp_start[--cmp_ofs];
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/* Each bit in the control byte is a flag indicating compressed or not compressed. */
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for (size_t i = 0; i < 8 && out_ofs; ++i, control <<= 1) {
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if (control & 0x80) {
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/* NOTE: Nintendo does not check if it's possible to decompress. */
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/* As such, we will leave the following as a debug assertion, and not a release assertion. */
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AMS_AUDIT(cmp_ofs >= sizeof(u16));
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cmp_ofs -= sizeof(u16);
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/* Extract segment bounds. */
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const util::BitPack16 seg_flags{static_cast<u16>((cmp_start[cmp_ofs] << 0) | (cmp_start[cmp_ofs + 1] << 8))};
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const u32 seg_ofs = seg_flags.Get<BlzSegmentFlags::Offset>() + 3;
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const u32 seg_size = std::min(seg_flags.Get<BlzSegmentFlags::Size>() + 3, out_ofs);
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AMS_AUDIT(out_ofs + seg_ofs <= total_size + additional_size);
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/* Copy the data. */
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out_ofs -= seg_size;
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for (size_t j = 0; j < seg_size; j++) {
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cmp_start[out_ofs + j] = cmp_start[out_ofs + seg_ofs + j];
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}
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} else {
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/* NOTE: Nintendo does not check if it's possible to copy. */
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/* As such, we will leave the following as a debug assertion, and not a release assertion. */
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AMS_AUDIT(cmp_ofs >= sizeof(u8));
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cmp_start[--out_ofs] = cmp_start[--cmp_ofs];
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}
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}
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}
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}
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void *ReadFile(s64 *out_size, const char *path, size_t align = 0x10) {
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fs::FileHandle file;
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if (R_SUCCEEDED(fs::OpenFile(std::addressof(file), path, fs::OpenMode_Read))) {
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}
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/* Get meta for FS process. */
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constexpr u64 FsProgramId = 0x0100000000000000;
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auto *fs_meta = FindInitialProcess(FsProgramId);
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if (fs_meta == nullptr) {
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/* Get nintendo header/data. */
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@ -833,7 +893,220 @@ namespace ams::nxboot {
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}
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void RebuildPackage2(ams::TargetFirmware target_firmware, bool emummc_enabled) {
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/* TODO */
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/* Get the secondary archive. */
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const auto &secondary_archive = GetSecondaryArchive();
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/* Clear package2 header. */
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auto *package2 = secmon::MemoryRegionDramPackage2.GetPointer<pkg2::Package2Header>();
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std::memset(package2, 0, sizeof(*package2));
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/* Get payload data pointer. */
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u8 * const payload_data = reinterpret_cast<u8 *>(package2 + 1);
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/* Useful values. */
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constexpr u32 KernelPayloadBase = 0x60000;
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/* Set fields. */
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package2->meta.key_generation = pkg1::KeyGeneration_Current;
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std::memcpy(package2->meta.magic, pkg2::Package2Meta::Magic::String, sizeof(package2->meta.magic));
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package2->meta.entrypoint = KernelPayloadBase;
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package2->meta.bootloader_version = pkg2::CurrentBootloaderVersion;
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package2->meta.package2_version = pkg2::MinimumValidDataVersion;
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/* Load mesosphere. */
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s64 meso_size;
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if (void *sd_meso = ReadFile(std::addressof(meso_size), "sdmc:/atmosphere/mesosphere.bin"); sd_meso != nullptr) {
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std::memcpy(payload_data, sd_meso, meso_size);
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} else {
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meso_size = secondary_archive.header.meso_size;
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std::memcpy(payload_data, secondary_archive.mesosphere, meso_size);
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}
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/* Read emummc, if needed. */
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const InitialProcessHeader *emummc;
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s64 emummc_size;
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if (emummc_enabled) {
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emummc = static_cast<const InitialProcessHeader *>(ReadFile(std::addressof(emummc_size), "sdmc:/atmosphere/emummc.kip"));
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if (emummc == nullptr) {
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emummc = reinterpret_cast<const InitialProcessHeader *>(secondary_archive.kips + secondary_archive.header.emummc_meta.offset);
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emummc_size = secondary_archive.header.emummc_meta.size;
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}
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}
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/* Set the embedded ini pointer. */
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std::memcpy(payload_data + 8, std::addressof(meso_size), sizeof(meso_size));
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/* Get the ini pointer. */
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InitialProcessBinaryHeader * const ini = reinterpret_cast<InitialProcessBinaryHeader *>(payload_data + meso_size);
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/* Set ini fields. */
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ini->magic = InitialProcessBinaryHeader::Magic;
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ini->num_processes = 0;
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ini->reserved = 0;
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/* Iterate all processes. */
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u8 * const dst_kip_start = reinterpret_cast<u8 *>(ini + 1);
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u8 * dst_kip_cur = dst_kip_start;
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for (InitialProcessMeta *meta = std::addressof(g_initial_process_meta); meta != nullptr; meta = meta->next) {
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/* Get the current kip. */
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const auto *src_kip = meta->kip;
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auto *dst_kip = reinterpret_cast<InitialProcessHeader *>(dst_kip_cur);
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/* Copy the kip header */
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std::memcpy(dst_kip, src_kip, sizeof(*src_kip));
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const u8 *src_kip_data = reinterpret_cast<const u8 *>(src_kip + 1);
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u8 *dst_kip_data = reinterpret_cast< u8 *>(dst_kip + 1);
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/* If necessary, inject emummc. */
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u32 addl_text_offset = 0;
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if (dst_kip->program_id == FsProgramId && emummc_enabled) {
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/* Get emummc extents. */
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addl_text_offset = emummc->bss_address + emummc->bss_size;
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if ((emummc->flags & 7) || !util::IsAligned(addl_text_offset, 0x1000)) {
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ShowFatalError("Invalid emummc kip!\n");
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}
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/* Copy emummc capabilities. */
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{
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std::memcpy(dst_kip->capabilities, emummc->capabilities, sizeof(emummc->capabilities));
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if (target_firmware <= ams::TargetFirmware_1_0_0) {
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for (size_t i = 0; i < util::size(dst_kip->capabilities); ++i) {
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if (dst_kip->capabilities[i] == 0xFFFFFFFF) {
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dst_kip->capabilities[i] = 0x07000E7F;
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break;
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}
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}
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}
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}
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/* Update section headers. */
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dst_kip->ro_address += addl_text_offset;
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dst_kip->rw_address += addl_text_offset;
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dst_kip->bss_address += addl_text_offset;
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/* Get emummc sections. */
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const u8 *emummc_data = reinterpret_cast<const u8 *>(emummc + 1);
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/* Copy emummc sections. */
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std::memcpy(dst_kip_data + emummc->rx_address, emummc_data, emummc->rx_compressed_size);
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std::memcpy(dst_kip_data + emummc->ro_address, emummc_data + emummc->rx_compressed_size, emummc->ro_compressed_size);
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std::memcpy(dst_kip_data + emummc->rw_address, emummc_data + emummc->rx_compressed_size + emummc->ro_compressed_size, emummc->rw_compressed_size);
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std::memset(dst_kip_data + emummc->bss_address, 0, emummc->bss_size);
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/* Advance. */
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dst_kip_data += addl_text_offset;
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}
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/* Prepare to process segments. */
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u8 *dst_rx_data, *dst_ro_data, *dst_rw_data;
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/* Process .text. */
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{
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dst_rx_data = dst_kip_data;
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std::memcpy(dst_kip_data, src_kip_data, src_kip->rx_compressed_size);
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/* Uncompress, if necessary. */
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if ((meta->patch_segments & src_kip->flags) & (1 << 0)) {
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BlzUncompress(dst_kip_data + dst_kip->rx_compressed_size);
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dst_kip->rx_compressed_size = dst_kip->rx_size;
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}
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/* Advance. */
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dst_kip_data += dst_kip->rx_compressed_size;
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src_kip_data += src_kip->rx_compressed_size;
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/* Account for potential emummc. */
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dst_kip->rx_size += addl_text_offset;
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dst_kip->rx_compressed_size += addl_text_offset;
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}
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/* Process .rodata. */
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{
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dst_ro_data = dst_kip_data;
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std::memcpy(dst_kip_data, src_kip_data, src_kip->ro_compressed_size);
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/* Uncompress, if necessary. */
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if ((meta->patch_segments & src_kip->flags) & (1 << 1)) {
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BlzUncompress(dst_kip_data + dst_kip->ro_compressed_size);
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dst_kip->ro_compressed_size = dst_kip->ro_size;
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}
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/* Advance. */
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dst_kip_data += dst_kip->ro_compressed_size;
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src_kip_data += src_kip->ro_compressed_size;
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}
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/* Process .rwdata. */
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{
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dst_rw_data = dst_kip_data;
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std::memcpy(dst_kip_data, src_kip_data, src_kip->rw_compressed_size);
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/* Uncompress, if necessary. */
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if ((meta->patch_segments & src_kip->flags) & (1 << 2)) {
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BlzUncompress(dst_kip_data + dst_kip->rw_compressed_size);
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dst_kip->rw_compressed_size = dst_kip->rw_size;
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}
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/* Advance. */
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dst_kip_data += dst_kip->rw_compressed_size;
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src_kip_data += src_kip->rw_compressed_size;
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}
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/* Adjust flags. */
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dst_kip->flags &= ~meta->patch_segments;
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/* Apply patches. */
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for (auto *patch = meta->patches_head; patch != nullptr; patch = patch->next) {
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/* Get the destination segment. */
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u8 *patch_dst_segment;
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switch (patch->start_segment) {
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case 0: patch_dst_segment = dst_rx_data; break;
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case 1: patch_dst_segment = dst_ro_data; break;
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case 2: patch_dst_segment = dst_rw_data; break;
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default: ShowFatalError("Unknown patch segment %" PRIu32 "\n", patch->start_segment); break;
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}
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/* Get the destination. */
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u8 * const patch_dst = patch_dst_segment + patch->rel_offset;
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/* Apply the patch. */
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if (patch->is_memset) {
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const u8 val = *static_cast<const u8 *>(patch->data);
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std::memset(patch_dst, val, patch->size);
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} else {
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std::memcpy(patch_dst, patch->data, patch->size);
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}
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}
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/* Advance. */
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dst_kip_cur += GetInitialProcessSize(dst_kip);
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/* Increment num kips. */
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++ini->num_processes;
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}
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/* Set INI size. */
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ini->size = sizeof(*ini) + (dst_kip_cur - dst_kip_start);
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if (ini->size > 12_MB) {
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ShowFatalError("INI is too big! (0x%08" PRIx32 ")\n", ini->size);
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}
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/* Set the payload size/offset. */
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package2->meta.payload_offsets[0] = KernelPayloadBase;
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package2->meta.payload_sizes[0] = util::AlignUp(meso_size + ini->size, 0x10);
|
||||
|
||||
|
||||
/* Set total size. */
|
||||
package2->meta.package2_size = sizeof(*package2) + package2->meta.payload_sizes[0];
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
@ -23,7 +23,7 @@ def get_overlay(program, i):
|
|||
KIP_NAMES = ['Loader', 'NCM', 'ProcessManager', 'sm', 'boot', 'spl', 'ams_mitm']
|
||||
|
||||
def get_kips():
|
||||
emummc = read_file('../../../../emummc/emummc.kip')
|
||||
emummc = read_file('../../../../emummc/emummc_unpacked.kip')
|
||||
loader = read_file('../../../../stratosphere/loader/loader.kip')
|
||||
ncm = read_file('../../../../stratosphere/ncm/ncm.kip')
|
||||
pm = read_file('../../../../stratosphere/pm/pm.kip')
|
||||
|
@ -45,11 +45,11 @@ def write_kip_meta(f, kip, ofs):
|
|||
# Write program id
|
||||
f.write(kip[0x10:0x18])
|
||||
# Write offset, size
|
||||
f.write(pk('<II', ofs, len(kip)))
|
||||
f.write(pk('<II', ofs - 0x100000, len(kip)))
|
||||
# Write hash
|
||||
f.write(hashlib.sha256(kip).digest())
|
||||
|
||||
def write_header(f, all_kips):
|
||||
def write_header(f, all_kips, meso_size):
|
||||
# Unpack kips
|
||||
emummc, kips = all_kips
|
||||
# Write reserved0 (previously entrypoint) as infinite loop instruction.
|
||||
|
@ -58,15 +58,17 @@ def write_header(f, all_kips):
|
|||
f.write(pk('<I', 0x20))
|
||||
# Write flags
|
||||
f.write(pk('<I', 0x00000000))
|
||||
# Write meso_size
|
||||
f.write(pk('<I', meso_size))
|
||||
# Write num_kips
|
||||
f.write(pk('<I', len(KIP_NAMES)))
|
||||
# Write reserved2
|
||||
f.write(b'\xCC' * 0x10)
|
||||
# Write reserved1
|
||||
f.write(b'\xCC' * 0xC)
|
||||
# Write magic
|
||||
f.write('FSS0')
|
||||
# Write total size
|
||||
f.write(pk('<I', 0x800000))
|
||||
# Write reserved3
|
||||
# Write reserved2
|
||||
f.write(pk('<I', 0xCCCCCCCC))
|
||||
# Write content_header_offset
|
||||
f.write(pk('<I', 0x40))
|
||||
|
@ -87,21 +89,25 @@ def write_header(f, all_kips):
|
|||
f.write(pk('<IIBBBBI16s', 0x7C0000, 0x020000, 0, 0, 0, 0, 0xCCCCCCCC, 'fusee'))
|
||||
f.write(pk('<IIBBBBI16s', 0x7E0000, 0x001000, 3, 0, 0, 0, 0xCCCCCCCC, 'rebootstub'))
|
||||
f.write(pk('<IIBBBBI16s', 0x100000, len(emummc), 8, 0, 0, 0, 0xCCCCCCCC, 'emummc'))
|
||||
ofs = 0x100000 + len(emummc)
|
||||
ofs = (0x100000 + len(emummc) + 0xF) & ~0xF
|
||||
for kip_name in KIP_NAMES:
|
||||
kip_data = kips[kip_name]
|
||||
f.write(pk('<IIBBBBI16s', ofs, len(kip_data), 6, 0, 0, 0, 0xCCCCCCCC, kip_name))
|
||||
ofs += len(kip_data)
|
||||
ofs += 0xF
|
||||
ofs &= ~0xF
|
||||
# Pad to kip metas.
|
||||
f.write(b'\xCC' * (0x400 - 0x40 - (0x20 * (8 + len(KIP_NAMES)))))
|
||||
# Write emummc_meta. */
|
||||
write_kip_meta(f, emummc, 0x100000)
|
||||
# Write kip metas
|
||||
ofs = 0x100000 + len(emummc)
|
||||
ofs = (0x100000 + len(emummc) + 0xF) & ~0xF
|
||||
for kip_name in KIP_NAMES:
|
||||
kip_data = kips[kip_name]
|
||||
write_kip_meta(f, kip_data, ofs)
|
||||
ofs += len(kip_data)
|
||||
ofs += 0xF
|
||||
ofs &= ~0xF
|
||||
# Pad to end of header
|
||||
f.write(b'\xCC' * (0x800 - (0x400 + (1 + len(KIP_NAMES)) * 0x30)))
|
||||
|
||||
|
@ -112,10 +118,18 @@ def write_kips(f, all_kips):
|
|||
f.write(emummc)
|
||||
# Write kips
|
||||
tot = len(emummc)
|
||||
if (tot & 0xF):
|
||||
f.write('\xCC' * (0x10 - (tot & 0xF)))
|
||||
tot += 0xF
|
||||
tot &= ~0xF
|
||||
for kip_name in KIP_NAMES:
|
||||
kip_data = kips[kip_name]
|
||||
f.write(kip_data)
|
||||
tot += len(kip_data)
|
||||
if (tot & 0xF):
|
||||
f.write('\xCC' * (0x10 - (tot & 0xF)))
|
||||
tot += 0xF
|
||||
tot &= ~0xF
|
||||
# Pad to 3 MB
|
||||
f.write(b'\xCC' * (0x300000 - tot))
|
||||
|
||||
|
@ -137,11 +151,12 @@ def main(argc, argv):
|
|||
erista_hsh = hashlib.sha256(erista_mtc[:-4]).digest()[:4]
|
||||
mariko_hsh = hashlib.sha256(mariko_mtc[:-4]).digest()[:4]
|
||||
fusee_program = lz4_compress(data[:0x2B000 - 8] + erista_hsh + mariko_hsh + get_overlay(data, 0)[:0x11000])
|
||||
mesosphere = read_file('../../../../mesosphere/mesosphere%s.bin' % target)
|
||||
with open('../../program%s.lz4' % target, 'wb') as f:
|
||||
f.write(fusee_program)
|
||||
with open('../../fusee-boogaloo%s.bin' % target, 'wb') as f:
|
||||
# Write header
|
||||
write_header(f, all_kips)
|
||||
write_header(f, all_kips, len(mesosphere))
|
||||
# Write warmboot
|
||||
f.write(pad(read_file('../../../../exosphere/warmboot%s.bin' % target), 0x1800))
|
||||
# Write TSEC Keygen
|
||||
|
|
|
@ -333,7 +333,7 @@ namespace ams::secmon {
|
|||
static_assert(MemoryRegionPhysicalTzramNonVolatile.Contains(MemoryRegionPhysicalTzramL2L3PageTable));
|
||||
|
||||
constexpr inline const MemoryRegion MemoryRegionPhysicalTzramFullProgramImage = MemoryRegion(UINT64_C(0x7C010800), 0xD800);
|
||||
constexpr inline const MemoryRegion MemoryRegionPhysicalIramBootCodeImage = MemoryRegion(UINT64_C(0x40032000), 0x6000);
|
||||
constexpr inline const MemoryRegion MemoryRegionPhysicalIramBootCodeImage = MemoryRegion(UINT64_C(0x40032000), 0xC000);
|
||||
|
||||
constexpr inline const MemoryRegion MemoryRegionPhysicalIramBootCodeCode = MemoryRegion(UINT64_C(0x40032000), 0x1000);
|
||||
constexpr inline const MemoryRegion MemoryRegionPhysicalIramBootCodeKeys = MemoryRegion(UINT64_C(0x40033000), 0x1000);
|
||||
|
|
Loading…
Reference in a new issue