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280867088c
The PE/COFF spec permits the COFF signature and file header to appear anywhere in the file, and the actual offset is recorded in 4 byte little endian field at offset 0x3c of the image. When GRUB is emitted as a PE/COFF binary, we reuse the 128 byte MS-DOS stub (even for non-x86 architectures), putting the COFF signature and file header at offset 0x80. However, other PE/COFF images may use different values, and non-x86 Linux kernels use an offset of 0x40 instead. So let's get rid of the grub_pe32_header struct from pe32.h, given that it does not represent anything defined by the PE/COFF spec. Instead, introduce a minimal struct grub_msdos_image_header type based on the PE/COFF spec's description of the image header, and use the offset recorded at file position 0x3c to discover the actual location of the PE signature and the COFF image header. The remaining fields are moved into a struct grub_pe_image_header, which we will use later to access COFF header fields of arbitrary images (and which may therefore appear at different offsets) Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Wentao Guan <guanwentao@uniontech.com>