Video Cards BIOS headers

[bog-dan-ro]

It will be great if ghidra will be able to read the GPU's rom headers, this way it can provide a great decompile experience.

Legacy PCI Expansion ROM Header:

struct pci_expansion_rom_header {
    uint16_t signature;        // 0x55AA
    uint8_t  size;             // Size of the ROM image in 512-byte blocks
    uint8_t  initialization[3];// Initialization code
    uint16_t pci_data_offset;  // Offset to PCI Data Structure
    uint16_t pnp_data_offset;  // Offset to PnP Expansion Header (optional)
};

struct pci_data_structure {
    uint32_t signature;        // "PCIR" (0x52494350)
    uint16_t vendor_id;
    uint16_t device_id;
    uint16_t device_list_offset;// Pointer to list of supported devices
    uint16_t pci_data_structure_length;
    uint8_t  pci_data_structure_revision;
    uint8_t  class_code[3];
    uint16_t image_length;     // Length of the entire ROM image in 512-byte blocks
    uint16_t revision_level;
    uint8_t  code_type;        // Type of code in this ROM (0 = x86, 1 = Open Firmware)
    uint8_t  last_image_indicator;
    uint16_t max_runtime_image_length;
};

UEFI PCI Expansion ROM Header:

struct efi_pci_expansion_rom_header {
    struct pci_expansion_rom_header legacy_header;
    struct pci_data_structure pci_data_structure;
    uint16_t efi_signature;    // 0x0EF1
    uint16_t efi_subsystem;
    uint16_t efi_machine_type;
    uint16_t compression_type;
    uint8_t  reserved[8];
    uint16_t efi_image_header_offset;
    uint16_t pcir_offset;
};

struct efi_image_header {
    uint32_t signature;        // "PE\0\0" or "TE\0\0" for compressed images
    uint16_t machine;
    uint16_t number_of_sections;
    uint32_t time_date_stamp;
    uint32_t pointer_to_symbol_table;
    uint32_t number_of_symbols;
    uint16_t size_of_optional_header;
    uint16_t characteristics;
    // ... more fields follow in the actual PE/COFF header
};

[ryanmkurtz]

Something like this would typically be done by a Ghidra Loader. Are you using a 3rd party loader for this type of binary?

[bog-dan-ro]

Something like this would typically be done by a Ghidra Loader. Are you using a 3rd party loader for this type of binary?

Nope, I'm using the official ghidra 11.1.2

[ryanmkurtz]

This is pretty niche...have you considered just making the structures in Ghidra and saving them off for your future projects?