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Windows Bootloader: pass correct compressed data size to decompressor. Because the ds segment register is modified when setting up the decompressor segment, loader length should be read from the cs segment. (#666)

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xiaolangde
2020-08-03 21:08:25 +08:00
committed by GitHub
parent 75e11add78
commit 3f25b281e7
1 changed files with 1 additions and 1 deletions
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src/Boot/Windows/BootSector.asm
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@@ -139,7 +139,7 @@ checksum_ok:
push dx push dx
; Decompress boot loader ; Decompress boot loader
mov cx, word ptr [start + TC_BOOT_SECTOR_LOADER_LENGTH_OFFSET] mov cx, word ptr cs:[start + TC_BOOT_SECTOR_LOADER_LENGTH_OFFSET]
sub cx, TC_GZIP_HEADER_SIZE sub cx, TC_GZIP_HEADER_SIZE
push cx ; Compressed data size push cx ; Compressed data size
push TC_BOOT_LOADER_COMPRESSED_BUFFER_OFFSET + TC_GZIP_HEADER_SIZE ; Compressed data push TC_BOOT_LOADER_COMPRESSED_BUFFER_OFFSET + TC_GZIP_HEADER_SIZE ; Compressed data