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Merge pull request #2023 from yuriks/autobase-bcfnt

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Auto-detect original shared_font.bin memory base
This commit is contained in:
bunnei 2016-08-30 09:26:38 -04:00 committed by GitHub
commit 7c934c5164
3 changed files with 68 additions and 30 deletions
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7
src/core/hle/service/apt/apt.cpp
View File

@ -81,13 +81,8 @@ void GetSharedFont(Service::Interface* self) {
// The shared font has to be relocated to the new address before being passed to the application.
VAddr target_address = Memory::PhysicalToVirtualAddress(shared_font_mem->linear_heap_phys_address);
// The shared font dumped by 3dsutils (https://github.com/citra-emu/3dsutils) uses this address as base,
// so we relocate it from there to our real address.
// TODO(Subv): This address is wrong if the shared font is dumped from a n3DS,
// we need a way to automatically calculate the original address of the font from the file.
static const VAddr SHARED_FONT_VADDR = 0x18000000;
if (!shared_font_relocated) {
BCFNT::RelocateSharedFont(shared_font_mem, SHARED_FONT_VADDR, target_address);
BCFNT::RelocateSharedFont(shared_font_mem, target_address);
shared_font_relocated = true;
}
cmd_buff[0] = IPC::MakeHeader(0x44, 2, 2);

79
src/core/hle/service/apt/bcfnt/bcfnt.cpp
View File

@ -9,60 +9,97 @@ namespace Service {
namespace APT {
namespace BCFNT {
void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr previous_address, VAddr new_address) {
void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr new_address) {
static const u32 SharedFontStartOffset = 0x80;
u8* data = shared_font->GetPointer(SharedFontStartOffset);
const u8* cfnt_ptr = shared_font->GetPointer(SharedFontStartOffset);
CFNT cfnt;
memcpy(&cfnt, data, sizeof(cfnt));
memcpy(&cfnt, cfnt_ptr, sizeof(cfnt));
// Advance past the header
data = shared_font->GetPointer(SharedFontStartOffset + cfnt.header_size);
u32 assumed_cmap_offset = 0;
u32 assumed_cwdh_offset = 0;
u32 assumed_tglp_offset = 0;
u32 first_cmap_offset = 0;
u32 first_cwdh_offset = 0;
u32 first_tglp_offset = 0;
// First discover the location of sections so that the rebase offset can be auto-detected
u32 current_offset = SharedFontStartOffset + cfnt.header_size;
for (unsigned block = 0; block < cfnt.num_blocks; ++block) {
const u8* data = shared_font->GetPointer(current_offset);
u32 section_size = 0;
if (memcmp(data, "FINF", 4) == 0) {
SectionHeader section_header;
memcpy(&section_header, data, sizeof(section_header));
if (first_cmap_offset == 0 && memcmp(section_header.magic, "CMAP", 4) == 0) {
first_cmap_offset = current_offset;
} else if (first_cwdh_offset == 0 && memcmp(section_header.magic, "CWDH", 4) == 0) {
first_cwdh_offset = current_offset;
} else if (first_tglp_offset == 0 && memcmp(section_header.magic, "TGLP", 4) == 0) {
first_tglp_offset = current_offset;
} else if (memcmp(section_header.magic, "FINF", 4) == 0) {
BCFNT::FINF finf;
memcpy(&finf, data, sizeof(finf));
assumed_cmap_offset = finf.cmap_offset - sizeof(SectionHeader);
assumed_cwdh_offset = finf.cwdh_offset - sizeof(SectionHeader);
assumed_tglp_offset = finf.tglp_offset - sizeof(SectionHeader);
}
current_offset += section_header.section_size;
}
u32 previous_base = assumed_cmap_offset - first_cmap_offset;
ASSERT(previous_base == assumed_cwdh_offset - first_cwdh_offset);
ASSERT(previous_base == assumed_tglp_offset - first_tglp_offset);
u32 offset = new_address - previous_base;
// Reset pointer back to start of sections and do the actual rebase
current_offset = SharedFontStartOffset + cfnt.header_size;
for (unsigned block = 0; block < cfnt.num_blocks; ++block) {
u8* data = shared_font->GetPointer(current_offset);
SectionHeader section_header;
memcpy(&section_header, data, sizeof(section_header));
if (memcmp(section_header.magic, "FINF", 4) == 0) {
BCFNT::FINF finf;
memcpy(&finf, data, sizeof(finf));
section_size = finf.section_size;
// Relocate the offsets in the FINF section
finf.cmap_offset += new_address - previous_address;
finf.cwdh_offset += new_address - previous_address;
finf.tglp_offset += new_address - previous_address;
finf.cmap_offset += offset;
finf.cwdh_offset += offset;
finf.tglp_offset += offset;
memcpy(data, &finf, sizeof(finf));
} else if (memcmp(data, "CMAP", 4) == 0) {
} else if (memcmp(section_header.magic, "CMAP", 4) == 0) {
BCFNT::CMAP cmap;
memcpy(&cmap, data, sizeof(cmap));
section_size = cmap.section_size;
// Relocate the offsets in the CMAP section
cmap.next_cmap_offset += new_address - previous_address;
cmap.next_cmap_offset += offset;
memcpy(data, &cmap, sizeof(cmap));
} else if (memcmp(data, "CWDH", 4) == 0) {
} else if (memcmp(section_header.magic, "CWDH", 4) == 0) {
BCFNT::CWDH cwdh;
memcpy(&cwdh, data, sizeof(cwdh));
section_size = cwdh.section_size;
// Relocate the offsets in the CWDH section
cwdh.next_cwdh_offset += new_address - previous_address;
cwdh.next_cwdh_offset += offset;
memcpy(data, &cwdh, sizeof(cwdh));
} else if (memcmp(data, "TGLP", 4) == 0) {
} else if (memcmp(section_header.magic, "TGLP", 4) == 0) {
BCFNT::TGLP tglp;
memcpy(&tglp, data, sizeof(tglp));
section_size = tglp.section_size;
// Relocate the offsets in the TGLP section
tglp.sheet_data_offset += new_address - previous_address;
tglp.sheet_data_offset += offset;
memcpy(data, &tglp, sizeof(tglp));
}
data += section_size;
current_offset += section_header.section_size;
}
}

12
src/core/hle/service/apt/bcfnt/bcfnt.h
View File

@ -22,6 +22,11 @@ struct CFNT {
u32_le num_blocks;
};
struct SectionHeader {
u8 magic[4];
u32_le section_size;
};
struct FINF {
u8 magic[4];
u32_le section_size;
@ -75,12 +80,13 @@ struct CWDH {
};
/**
* Relocates the internal addresses of the BCFNT Shared Font to the new base.
* Relocates the internal addresses of the BCFNT Shared Font to the new base. The current base will
* be auto-detected based on the file headers.
*
* @param shared_font SharedMemory object that contains the Shared Font
* @param previous_address Previous address at which the offsets in the structure were based.
* @param new_address New base for the offsets in the structure.
*/
void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr previous_address, VAddr new_address);
void RelocateSharedFont(Kernel::SharedPtr<Kernel::SharedMemory> shared_font, VAddr new_address);
} // namespace BCFNT
} // namespace APT