forked from KolibriOS/kolibrios
74 lines
1.6 KiB
NASM
74 lines
1.6 KiB
NASM
;
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; KolibriOS Dll load support
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;
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; (C) 2020-2021 Coldy
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; Thank's you for use this code and software based on it!
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; I will glad if it's will be helpful.
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;
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; Distributed under terms of GPL
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;
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format MS COFF
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public @EXPORT as 'EXPORTS'
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include '../../../proc32.inc'
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include '../../../macros.inc'
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section '.flat' code readable align 16
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app_version equ word[8]
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i_table_min_size = 1
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APP_START_THUNK:
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; First make shure that app
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; have header version 2.0 or more
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cmp app_version,2
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jl .denied
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; Then make shure that we first
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mov eax, @EXPORT
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cmp dword[eax-4],0
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je .denied
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; Don't allow second time
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mov dword[eax-4],0
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; Early app initialization
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; Test import table
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mov eax, [0x24] ; i_table_ptr
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test eax, eax
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jz @f
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mov esi, [0x10]
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cmp esi, eax
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jbe @f ; i_table_ptr >= img_size ?
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mov ebx, eax
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add ebx, i_table_min_size
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cmp esi, ebx
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jbe @f ; i_table_ptr + i_table_min_size >= img_size ?
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; Link app import table with DLL's exoport table
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stdcall dll.Load,eax
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test eax, eax
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jnz @f
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; Start of app code
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mov eax, [0x0C]
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; TODO: test start_ptr + min_code_size < img_size
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call eax
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@@:
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mov eax, -1
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int 0x40
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.denied:
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ret
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; } APP_START_THUNK
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; WARNING! This code must be after app initialization thunk!
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include '../../../dll.inc'
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align 4
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;dd 0xdeadbeef
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dd APP_START_THUNK
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@EXPORT:
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export \
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dll.Load, 'dll_load', \
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dll.Link, 'dll_link', \
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dll.GetProcAddress, 'dll_sym' ; |