Dll autoload

Kernel
- removed unnecessary and rewrote/add some comments, no code changes
User (lib/dll.obj)   
- Introduced new KX header as extension for existing formats
- Added staring KX header processing
- Improved import table test logic, no reason to kill app for import absence - skip 
  import processing (tnx ProMiNick)
- Add ReadMe.txt


git-svn-id: svn://kolibrios.org@8709 a494cfbc-eb01-0410-851d-a64ba20cac60

kernel/trunk/core/taskman.inc

@@ -834,6 +834,8 @@ common_app_entry:
         mov     ebp, [ebp+APPDATA.exec_params]
         test    ebp, ebp
         jz      .exit
+; APPDATA.exec_params have first thread only,
+; so second and next threads don't get here (they jump to .exit) 
         stdcall map_process_image, [ebp+APP_HDR._emem],\
                 [ebp+APP_HDR.img_base], [ebp+APP_HDR.img_size]
         mov     esi, [ebp+APP_HDR.path_string]
@@ -893,53 +895,34 @@ common_app_entry:
         mov     dx, app_tls
         mov     fs, dx       
 ; { Patch by Coldy, For DLL autoload    
-;   if APP_HEADER.version = 2 => lib/load dll.obj & change eip to APP_START_THUNK)
 .try_load_dll:         
-; TODO: It;s app, not thread?
+; Test app header version 
-           
-; Test app header version (
         mov     ecx, dword[ebp+APP_HDR.img_base]
-        ;DEBUGF 1, "K : ecx = %d\n", [ecx+8]
         cmp     dword[ecx+8], 2
         jne     .cleanup
+;if APP_HEADER.version = 2 => load lib/dll.obj & change eip to APP_STARTUP_THUNK
         DEBUGF 1, 'K : App header version 2\n'
-        ;DEBUGF 1, "K : DLL.OBJ path: %s\n", dll_lib_path
         stdcall load_library, dll_lib_path, 0
-        ;DEBUGF 1, "K : DLL.OBJ exp ptr: %x\n", eax
-        
-        ;test eax, eax
-        ;jnz @f
         cmp     eax, 0
         jne     @f
-; Something went wrong 
+; Something went wrong (TODO: Next 2 line is code copy after .cleanup)  
         stdcall free_kernel_space, [ebp+APP_HDR.img_base]
         stdcall kernel_free, ebp
-        DEBUGF 1, 'K : DLL.OBJ not found! Terminate application!'
+        DEBUGF 1, 'K : DLL.OBJ not found! Terminate application!\n'
         mov     ebx, dll_error_msg
         mov     ebp, notifyapp
         call    fs_execute_from_sysdir_param
-; Terminate process 
+; Terminate process (TODO: Need jump to .cleanup after sys_end ?) 
         call    sys_end
         
 @@:       
-        ; Find base of DLL.OBJ
+; Find APP_STARTUP_THUNK in DLL.OBJ
-        ;mov     ebx, eax
-        ;cdq
-        ;mov     ecx, 0x00000400
-        ;div     ecx
-        ;sub     ebx, edx
         sub     eax, 4
         mov     eax, [eax]
-        ;DEBUGF 1, "K : DLL.OBJ base ptr: %x\n", eax
-        
-; load_library don't map coff header,
-; so we may change entry point for app APP_START_THUNK
-; to base of DLL.OBJ
         
 ;.change_eip:
         mov     ecx, [current_slot]
         mov     ecx, [ecx+APPDATA.pl0_stack]
-        ;DEBUGF 1, "K : EIP = %x\n", ebx
         mov     [ecx+REG_EIP], eax
         
 ; } End patch by Coldy, For DLL autoload

programs/develop/libraries/dll/ReadMe.txt

@@ -0,0 +1,105 @@
+
+---
+History
+
+0.1 	+ First realised, kernel load dll.obj at runtime as starting point berfore app startup
+      	  dll.obj process app import table, but not depended librarys, after that app gots control in his starting point
+
+0.2 	+ Introduced new KX header as extension for current format (see decription below)
+      	+ Add KX header processing
+	+ Improved import table test logic, no reason to kill app for import absence - skip import processing (tnx ProMiNick)		
+
+---
+Purpose
+ 
+Automatically libraries loads and linking imports.	  
+
+---
+Limitations
+
+
+1) No error messages are issued if the library or symbol in the library is not found or somthing went wrong
+
+
+2) There is no autoloading of dependent libraries (the library format needs to be improved, see intorduction of KX header extension bellow)
+
+---
+How to use
+
+- in app:
+1) In the version field of a header,  (after MENUET0x) you must specify the number 2
+2) After existing header add KX header extension as descriprion bellow
+3) Specify imported libraries. Currentry format of import table same as in case of using dll.Load
+4) Add code, without connecting dll.inc and, accordingly, without calling dll.Load. The heap initialization function (f. 68.11) does not need to be called either.
+
+5) Compile the app and run. If everything is done correctly, then on startup the debug board will display the message "App header version 2"
+   If the DLL.OBJ library is missing, a message will be displayed, incl. via @NOTIFY. If you get a page error make sure you have completed    steps 2 and 3
+
+- in lib (obj):
+Not supported yet, will be realized later.
+1) Field optHeader of COFF header need set in 8+n*4, where n is count of fields after KX header 
+2) After COFF header add KX header extension (in general same as in case for app)
+
+---
+Descriprion of KX header extension (alpha).
+
+TBD is meaning that this feature to be determined leter, and not supported yet.
+By default all offsets and sizes given in bytes, for Flags field offsets and size given in bits. 
+Offset 4.x meaning offset 4 bit x
+ 
+Fields between offset 8 and at end of KX header may be added later.
+
+ Offset	Size    Field			Meaning
+
+		Signature:
+
+ 0	2	SigMagic		Module identifier with the value "KX"
+
+ 2	1	SigRevision		This field should be 0. 
+In the future, it can take on the revision value 
+					(but can't take values higher than 64)
+
+ 3	1	SigArch			This field should be 0. 
+
+
+ 4	2	Flags:
+
+ 4.0	2b	F_ImageType		TBD, this field should be 0 		
+ 
+ 4.2	1b	F_SectionMode		TBD, this field should be 0
+
+ 4.3	1b	F_Const			TBD, this field should be 0
+
+ 4.4	1b	F_Data			TBD, this field should be 0
+		
+ 4.5	1b	F_Export		Module has export table, and pointer after header (see below)
+
+ 4.6	1b	F_Import		Module has import table
+
+ 4.7	1b	F_Reserved		Reserved, this field should be 0
+
+ 4.8	1b	F_BoundImport		TBD, this field should be 0
+	
+ 4.9	1b	F_BSS			TBD, this field should be 0
+
+ 4.10	1b	F_TLS			TBD, this field should be 0
+
+ 1.11	5b	F_Reserved		Reserved, this field should be 0
+
+
+ 6	2	Reserved		Reserved, this field should be 0	
+	
+	... 	TBD			Fields in this place may be added later
+
+if(F_Export) {
+ ?	4	ExportsHeader		Pointer to export header (exists if F_Export=1), KX style export table not supported yet. Currently 						by backward compatibility reason used legacy style of export table, this field pointed to it 			
+}
+
+if(F_Import) {
+ ?	4	ImportsHeader		Pointer to imports header (exists if F_Import=1), KX style import table not supported yet. Currently 						by backward compatibility reason used legacy style of import table, this field pointed to it
+}
+
+	... 	TBD			Fields in this place may be added later
+
+---
+EOF

programs/develop/libraries/dll/dll.asm

@@ -10,19 +10,21 @@
 format MS COFF
 public @EXPORT as 'EXPORTS'
 
-include '../../../proc32.inc'
+include '../../proc32.inc'
-include '../../../macros.inc'
+include '../../macros.inc'
 
 section '.flat' code readable align 16
 
-app_version	  equ word[8]
+app_version       equ word[8]
 i_table_min_size  =   1
 
-APP_START_THUNK:
+sizeof.kx_header  =   8
+
+APP_STARTUP_THUNK:
     ; First make shure that app 
     ; have header version 2.0 or more
     cmp app_version,2
-    jl .denied
+    jl .denied            ; App with app_version < 2 shouldn't be here 
     
     ; Then make shure that we first
     mov eax, @EXPORT
@@ -34,41 +36,67 @@ APP_START_THUNK:
     
    ; Early app initialization
 
-   ; Test import table	
+;{ Test KX header
-   mov	eax, [0x24] ; i_table_ptr
+   ;xor  eax, eax
+   mov	esi,0x24
+   lodsw
+   cmp ax, 'KX'
+   jne @f ; Not KX
+   lodsw
+   cmp ax, 0
+   jne @f ; Bad magic
+   lodsw
+   
+   bt ax, 6 ; Have import?
+   jnc .app_start 
+;}
+   
+   ; Test import table (use legacy style)  
+   mov  eax, [sizeof.kx_header + 0x24] ; i_table_ptr
    test eax, eax
-   jz  @f
+   jz  .app_start           ; i_table_ptr = 0 ?
+   ;js      .error
    mov esi, [0x10] 
    cmp esi, eax
-   jbe @f	    ; i_table_ptr >= img_size ?
+   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 ?
+   jb @f           ; i_table_ptr + i_table_min_size > img_size ?
+   
+   ; Link app/dependent libs import tables with libs export table
+   ; TODO: need revision of the exists lib format and dll.Load (for libs import binds)
            
-   ; Link app import table with DLL's exoport table	  
    stdcall dll.Load,eax 
-   test eax, eax
+   test	eax, eax
-   jnz	@f   
+   jnz	.import_error
+.app_start:   
    ; Start of app code
-   mov	eax, [0x0C]
+   mov  eax, [0x0C]
    ; TODO: test start_ptr + min_code_size < img_size    
    call eax
 @@:
    mov eax, -1
    int 0x40
+.import_error:
+  ; Run @NOTIFY and tell user then error occured
+  ; BOARD will contaits details
+  jmp @b
 .denied:
-   ret
+    ; Kolibri has no ability kill app if this enter from no from main thread
-; } APP_START_THUNK
+    ; So just alert and return
+    ;DEBUGF	1, 'APP_STARTUP_THUNK@dll.obj: App twice/with app_version < 2 has entered!\n'
+    ret  
+; } APP_STARTUP_THUNK
 
 
 ; WARNING! This code must be after app initialization thunk!
-include '../../../dll.inc'
+include '../../dll.inc'
 align 4
 ;dd 0xdeadbeef
-dd APP_START_THUNK
+dd APP_STARTUP_THUNK
 @EXPORT:
-export				    \
+export                              \
-    dll.Load,		'dll_load',  \
+    dll.Load,           'dll_load',  \
-    dll.Link,		'dll_link',  \
+    dll.Link,           'dll_link',  \
     dll.GetProcAddress, 'dll_sym' ;