From 329a8c7553df9ca8ffb7d81493c2f5a7f9b5ed1a Mon Sep 17 00:00:00 2001
From: Coldy <Coldy@kolibrios.org>
Date: Sat, 17 Apr 2021 09:40:01 +0000
Subject: [PATCH] For DLL autoload

git-svn-id: svn://kolibrios.org@8672 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 programs/develop/libraries/dll/dll.asm | 74 ++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 programs/develop/libraries/dll/dll.asm

diff --git a/programs/develop/libraries/dll/dll.asm b/programs/develop/libraries/dll/dll.asm
new file mode 100644
index 0000000000..8af6122755
--- /dev/null
+++ b/programs/develop/libraries/dll/dll.asm
@@ -0,0 +1,74 @@
+;
+;  KolibriOS Dll load support
+;
+;  (C) 2020-2021 Coldy	
+;  Thank's you for use this code and software based on it!
+;  I will glad if it's will be helpful. 
+;
+;  Distributed under terms of GPL
+;
+format MS COFF
+public @EXPORT as 'EXPORTS'
+
+include '../../../proc32.inc'
+include '../../../macros.inc'
+
+section '.flat' code readable align 16
+
+app_version	  equ word[8]
+i_table_min_size  =   1
+
+APP_START_THUNK:
+    ; First make shure that app 
+    ; have header version 2.0 or more
+    cmp app_version,2
+    jl .denied
+    
+    ; Then make shure that we first
+    mov eax, @EXPORT
+    cmp dword[eax-4],0
+    je .denied
+    
+    ; Don't allow second time
+    mov dword[eax-4],0	
+    
+   ; Early app initialization
+   
+   ; Test import table	
+   mov	eax, [0x24] ; i_table_ptr
+   test eax, eax
+   jz  @f
+   mov esi, [0x10] 
+   cmp esi, eax
+   jbe @f	    ; i_table_ptr >= img_size ?
+   mov ebx, eax
+   add ebx, i_table_min_size 
+   cmp esi, ebx
+   jbe @f	    ; i_table_ptr + i_table_min_size >= img_size ?
+   
+   ; Link app import table with DLL's exoport table	  
+   stdcall dll.Load,eax 
+   test eax, eax
+   jnz	@f   
+   ; Start of app code
+   mov	eax, [0x0C]
+   ; TODO: test start_ptr + min_code_size < img_size	
+   call eax
+@@:
+   mov eax, -1
+   int 0x40
+.denied:
+   ret
+; } APP_START_THUNK
+
+
+; WARNING! This code must be after app initialization thunk!
+include '../../../dll.inc'
+align 4
+;dd 0xdeadbeef
+dd APP_START_THUNK
+@EXPORT:
+export				    \
+    dll.Load,		'dll_load',  \
+    dll.Link,		'dll_link',  \
+    dll.GetProcAddress, 'dll_sym' ;
\ No newline at end of file