69 lines
1.7 KiB
NASM
69 lines
1.7 KiB
NASM
filename equ '%EXENAME%'
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virtual at 0
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file filename:3Ch,4
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load pehea dword from 0
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file filename:pehea,0F8h+28h*3
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load NumberOfSections word from 4+6
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load SizeOfOptionalHeader word from 4+14h
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if NumberOfSections<>3
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error Expected three sections, .text, .bss and .reloc
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end if
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if SizeOfOptionalHeader<>0E0h
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error Nonstandard PE header
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end if
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load RelocsRVA dword from 4+0A0h
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load RelocsSize dword from 4+0A4h
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load ImageBase dword from 4+34h
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load TextRVA dword from 4+0F8h+0Ch
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load TextSize dword from 4+0F8h+8
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load TextOffs dword from 4+0F8h+14h
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load BSSSize dword from 4+0F8h+28h+10h
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load RelocRVA dword from 4+0F8h+28h*2+0Ch
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load RelocOffs dword from 4+0F8h+28h*2+14h
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if BSSSize
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error Second section expected to be .bss
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end if
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if RelocRVA<>RelocsRVA
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error Third section expected to be .reloc
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end if
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;file 'test.exe':pehea+0F8h,28h
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;load physofs dword from 4+14h
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;load mem dword from 4+8
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;file 'test.exe':physofs+16,4
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;load sz dword from $-4
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end virtual
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file filename:TextOffs,TextSize
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while RelocsSize>8
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virtual at 0
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file filename:RelocOffs,8
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load CurRelocPage dword from 0
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load CurRelocChunkSize dword from 4
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end virtual
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RelocsSize=RelocsSize-CurRelocChunkSize
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CurRelocChunkSize = CurRelocChunkSize-8
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RelocOffs=RelocOffs+8
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while CurRelocChunkSize
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virtual at 0
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file filename:RelocOffs,2
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RelocOffs=RelocOffs+2
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CurRelocChunkSize=CurRelocChunkSize-2
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load s word from 0
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end virtual
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CurRelocType = s shr 12
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RelocItem = CurRelocPage + (s and 0xFFF)
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if CurRelocType=0
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else if CurRelocType=3
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load z dword from RelocItem-TextRVA
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store dword z-(TextRVA+ImageBase) at RelocItem-TextRVA
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else
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error Unexpected relocation type
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end if
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end while
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end while
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store dword TextSize at 10h
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store dword RelocRVA-TextRVA at 14h
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