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https://github.com/yuzu-emu/yuzu.git
synced 2024-08-22 04:13:25 +02:00
Auto-detect original shared_font.bin memory base
This allows a file dumped from either an o3DS or a n3DS (and potentially even an original unrebased file) to be used.
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@ -81,13 +81,8 @@ void GetSharedFont(Service::Interface* self) {
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// The shared font has to be relocated to the new address before being passed to the application.
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VAddr target_address = Memory::PhysicalToVirtualAddress(shared_font_mem->linear_heap_phys_address);
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// The shared font dumped by 3dsutils (https://github.com/citra-emu/3dsutils) uses this address as base,
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// so we relocate it from there to our real address.
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// TODO(Subv): This address is wrong if the shared font is dumped from a n3DS,
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// we need a way to automatically calculate the original address of the font from the file.
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static const VAddr SHARED_FONT_VADDR = 0x18000000;
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if (!shared_font_relocated) {
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BCFNT::RelocateSharedFont(shared_font_mem, SHARED_FONT_VADDR, target_address);
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BCFNT::RelocateSharedFont(shared_font_mem, target_address);
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shared_font_relocated = true;
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}
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cmd_buff[0] = IPC::MakeHeader(0x44, 2, 2);
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@ -9,60 +9,97 @@ namespace Service {
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namespace APT {
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namespace BCFNT {
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void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr previous_address, VAddr new_address) {
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void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr new_address) {
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static const u32 SharedFontStartOffset = 0x80;
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u8* data = shared_font->GetPointer(SharedFontStartOffset);
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const u8* cfnt_ptr = shared_font->GetPointer(SharedFontStartOffset);
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CFNT cfnt;
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memcpy(&cfnt, data, sizeof(cfnt));
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memcpy(&cfnt, cfnt_ptr, sizeof(cfnt));
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// Advance past the header
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data = shared_font->GetPointer(SharedFontStartOffset + cfnt.header_size);
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u32 assumed_cmap_offset = 0;
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u32 assumed_cwdh_offset = 0;
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u32 assumed_tglp_offset = 0;
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u32 first_cmap_offset = 0;
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u32 first_cwdh_offset = 0;
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u32 first_tglp_offset = 0;
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// First discover the location of sections so that the rebase offset can be auto-detected
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u32 current_offset = SharedFontStartOffset + cfnt.header_size;
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for (unsigned block = 0; block < cfnt.num_blocks; ++block) {
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const u8* data = shared_font->GetPointer(current_offset);
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u32 section_size = 0;
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if (memcmp(data, "FINF", 4) == 0) {
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SectionHeader section_header;
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memcpy(§ion_header, data, sizeof(section_header));
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if (first_cmap_offset == 0 && memcmp(section_header.magic, "CMAP", 4) == 0) {
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first_cmap_offset = current_offset;
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} else if (first_cwdh_offset == 0 && memcmp(section_header.magic, "CWDH", 4) == 0) {
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first_cwdh_offset = current_offset;
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} else if (first_tglp_offset == 0 && memcmp(section_header.magic, "TGLP", 4) == 0) {
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first_tglp_offset = current_offset;
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} else if (memcmp(section_header.magic, "FINF", 4) == 0) {
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BCFNT::FINF finf;
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memcpy(&finf, data, sizeof(finf));
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assumed_cmap_offset = finf.cmap_offset - sizeof(SectionHeader);
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assumed_cwdh_offset = finf.cwdh_offset - sizeof(SectionHeader);
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assumed_tglp_offset = finf.tglp_offset - sizeof(SectionHeader);
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}
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current_offset += section_header.section_size;
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}
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u32 previous_base = assumed_cmap_offset - first_cmap_offset;
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ASSERT(previous_base == assumed_cwdh_offset - first_cwdh_offset);
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ASSERT(previous_base == assumed_tglp_offset - first_tglp_offset);
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u32 offset = new_address - previous_base;
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// Reset pointer back to start of sections and do the actual rebase
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current_offset = SharedFontStartOffset + cfnt.header_size;
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for (unsigned block = 0; block < cfnt.num_blocks; ++block) {
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u8* data = shared_font->GetPointer(current_offset);
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SectionHeader section_header;
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memcpy(§ion_header, data, sizeof(section_header));
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if (memcmp(section_header.magic, "FINF", 4) == 0) {
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BCFNT::FINF finf;
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memcpy(&finf, data, sizeof(finf));
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section_size = finf.section_size;
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// Relocate the offsets in the FINF section
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finf.cmap_offset += new_address - previous_address;
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finf.cwdh_offset += new_address - previous_address;
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finf.tglp_offset += new_address - previous_address;
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finf.cmap_offset += offset;
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finf.cwdh_offset += offset;
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finf.tglp_offset += offset;
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memcpy(data, &finf, sizeof(finf));
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} else if (memcmp(data, "CMAP", 4) == 0) {
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} else if (memcmp(section_header.magic, "CMAP", 4) == 0) {
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BCFNT::CMAP cmap;
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memcpy(&cmap, data, sizeof(cmap));
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section_size = cmap.section_size;
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// Relocate the offsets in the CMAP section
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cmap.next_cmap_offset += new_address - previous_address;
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cmap.next_cmap_offset += offset;
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memcpy(data, &cmap, sizeof(cmap));
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} else if (memcmp(data, "CWDH", 4) == 0) {
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} else if (memcmp(section_header.magic, "CWDH", 4) == 0) {
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BCFNT::CWDH cwdh;
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memcpy(&cwdh, data, sizeof(cwdh));
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section_size = cwdh.section_size;
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// Relocate the offsets in the CWDH section
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cwdh.next_cwdh_offset += new_address - previous_address;
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cwdh.next_cwdh_offset += offset;
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memcpy(data, &cwdh, sizeof(cwdh));
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} else if (memcmp(data, "TGLP", 4) == 0) {
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} else if (memcmp(section_header.magic, "TGLP", 4) == 0) {
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BCFNT::TGLP tglp;
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memcpy(&tglp, data, sizeof(tglp));
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section_size = tglp.section_size;
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// Relocate the offsets in the TGLP section
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tglp.sheet_data_offset += new_address - previous_address;
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tglp.sheet_data_offset += offset;
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memcpy(data, &tglp, sizeof(tglp));
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}
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data += section_size;
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current_offset += section_header.section_size;
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}
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}
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@ -22,6 +22,11 @@ struct CFNT {
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u32_le num_blocks;
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};
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struct SectionHeader {
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u8 magic[4];
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u32_le section_size;
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};
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struct FINF {
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u8 magic[4];
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u32_le section_size;
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@ -75,12 +80,13 @@ struct CWDH {
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};
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/**
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* Relocates the internal addresses of the BCFNT Shared Font to the new base.
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* Relocates the internal addresses of the BCFNT Shared Font to the new base. The current base will
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* be auto-detected based on the file headers.
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*
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* @param shared_font SharedMemory object that contains the Shared Font
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* @param previous_address Previous address at which the offsets in the structure were based.
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* @param new_address New base for the offsets in the structure.
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*/
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void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr previous_address, VAddr new_address);
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void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr new_address);
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} // namespace BCFNT
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} // namespace APT
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