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
This commit is contained in:
Coldy
parent
43506beeb7
commit
ed25f2c1ca
@ -834,6 +834,8 @@ common_app_entry:
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mov ebp, [ebp+APPDATA.exec_params]
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test ebp, ebp
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jz .exit
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; APPDATA.exec_params have first thread only,
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; so second and next threads don't get here (they jump to .exit)
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stdcall map_process_image, [ebp+APP_HDR._emem],\
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[ebp+APP_HDR.img_base], [ebp+APP_HDR.img_size]
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mov esi, [ebp+APP_HDR.path_string]
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@ -892,54 +894,35 @@ common_app_entry:
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mov [tls_data_l+7], ah
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mov dx, app_tls
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mov fs, dx
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; { Patch by Coldy, For DLL autoload
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; if APP_HEADER.version = 2 => lib/load dll.obj & change eip to APP_START_THUNK)
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.try_load_dll:
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; TODO: It;s app, not thread?
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; Test app header version (
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; { Patch by Coldy, For DLL autoload
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.try_load_dll:
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; Test app header version
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mov ecx, dword[ebp+APP_HDR.img_base]
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;DEBUGF 1, "K : ecx = %d\n", [ecx+8]
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cmp dword[ecx+8], 2
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jne .cleanup
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;if APP_HEADER.version = 2 => load lib/dll.obj & change eip to APP_STARTUP_THUNK
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DEBUGF 1, 'K : App header version 2\n'
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;DEBUGF 1, "K : DLL.OBJ path: %s\n", dll_lib_path
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stdcall load_library, dll_lib_path, 0
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;DEBUGF 1, "K : DLL.OBJ exp ptr: %x\n", eax
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;test eax, eax
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;jnz @f
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cmp eax, 0
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jne @f
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; Something went wrong
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; Something went wrong (TODO: Next 2 line is code copy after .cleanup)
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stdcall free_kernel_space, [ebp+APP_HDR.img_base]
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stdcall kernel_free, ebp
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DEBUGF 1, 'K : DLL.OBJ not found! Terminate application!'
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DEBUGF 1, 'K : DLL.OBJ not found! Terminate application!\n'
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mov ebx, dll_error_msg
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mov ebp, notifyapp
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call fs_execute_from_sysdir_param
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; Terminate process
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; Terminate process (TODO: Need jump to .cleanup after sys_end ?)
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call sys_end
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@@:
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; Find base of DLL.OBJ
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;mov ebx, eax
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;cdq
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;mov ecx, 0x00000400
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;div ecx
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;sub ebx, edx
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; Find APP_STARTUP_THUNK in DLL.OBJ
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sub eax, 4
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mov eax, [eax]
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;DEBUGF 1, "K : DLL.OBJ base ptr: %x\n", eax
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; load_library don't map coff header,
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; so we may change entry point for app APP_START_THUNK
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; to base of DLL.OBJ
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mov eax, [eax]
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;.change_eip:
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mov ecx, [current_slot]
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mov ecx, [ecx+APPDATA.pl0_stack]
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;DEBUGF 1, "K : EIP = %x\n", ebx
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mov [ecx+REG_EIP], eax
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; } End patch by Coldy, For DLL autoload
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105
programs/develop/libraries/dll/ReadMe.txt
Normal file
105
programs/develop/libraries/dll/ReadMe.txt
Normal file
@ -0,0 +1,105 @@
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---
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History
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0.1 + First realised, kernel load dll.obj at runtime as starting point berfore app startup
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dll.obj process app import table, but not depended librarys, after that app gots control in his starting point
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0.2 + Introduced new KX header as extension for current format (see decription below)
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+ Add KX header processing
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+ Improved import table test logic, no reason to kill app for import absence - skip import processing (tnx ProMiNick)
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---
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Purpose
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Automatically libraries loads and linking imports.
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---
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Limitations
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1) No error messages are issued if the library or symbol in the library is not found or somthing went wrong
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2) There is no autoloading of dependent libraries (the library format needs to be improved, see intorduction of KX header extension bellow)
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---
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How to use
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- in app:
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1) In the version field of a header, (after MENUET0x) you must specify the number 2
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2) After existing header add KX header extension as descriprion bellow
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3) Specify imported libraries. Currentry format of import table same as in case of using dll.Load
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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.
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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"
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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
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- in lib (obj):
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Not supported yet, will be realized later.
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1) Field optHeader of COFF header need set in 8+n*4, where n is count of fields after KX header
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2) After COFF header add KX header extension (in general same as in case for app)
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---
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Descriprion of KX header extension (alpha).
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TBD is meaning that this feature to be determined leter, and not supported yet.
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By default all offsets and sizes given in bytes, for Flags field offsets and size given in bits.
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Offset 4.x meaning offset 4 bit x
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Fields between offset 8 and at end of KX header may be added later.
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Offset Size Field Meaning
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Signature:
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0 2 SigMagic Module identifier with the value "KX"
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2 1 SigRevision This field should be 0.
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In the future, it can take on the revision value
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(but can't take values higher than 64)
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3 1 SigArch This field should be 0.
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4 2 Flags:
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4.0 2b F_ImageType TBD, this field should be 0
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4.2 1b F_SectionMode TBD, this field should be 0
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4.3 1b F_Const TBD, this field should be 0
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4.4 1b F_Data TBD, this field should be 0
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4.5 1b F_Export Module has export table, and pointer after header (see below)
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4.6 1b F_Import Module has import table
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4.7 1b F_Reserved Reserved, this field should be 0
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4.8 1b F_BoundImport TBD, this field should be 0
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4.9 1b F_BSS TBD, this field should be 0
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4.10 1b F_TLS TBD, this field should be 0
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1.11 5b F_Reserved Reserved, this field should be 0
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6 2 Reserved Reserved, this field should be 0
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... TBD Fields in this place may be added later
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if(F_Export) {
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? 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
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}
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if(F_Import) {
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? 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
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}
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... TBD Fields in this place may be added later
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---
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EOF
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@ -10,19 +10,21 @@
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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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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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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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sizeof.kx_header = 8
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APP_STARTUP_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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jl .denied ; App with app_version < 2 shouldn't be here
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; Then make shure that we first
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mov eax, @EXPORT
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@ -30,45 +32,71 @@ APP_START_THUNK:
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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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mov dword[eax-4],0
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; Early app initialization
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;{ Test KX header
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;xor eax, eax
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mov esi,0x24
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lodsw
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cmp ax, 'KX'
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jne @f ; Not KX
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lodsw
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cmp ax, 0
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jne @f ; Bad magic
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lodsw
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; Test import table
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mov eax, [0x24] ; i_table_ptr
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bt ax, 6 ; Have import?
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jnc .app_start
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;}
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; Test import table (use legacy style)
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mov eax, [sizeof.kx_header + 0x24] ; i_table_ptr
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test eax, eax
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jz @f
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jz .app_start ; i_table_ptr = 0 ?
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;js .error
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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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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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jb @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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; Link app/dependent libs import tables with libs export table
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; TODO: need revision of the exists lib format and dll.Load (for libs import binds)
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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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test eax, eax
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jnz .import_error
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.app_start:
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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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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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.import_error:
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; Run @NOTIFY and tell user then error occured
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; BOARD will contaits details
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jmp @b
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.denied:
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ret
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; } APP_START_THUNK
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; Kolibri has no ability kill app if this enter from no from main thread
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; So just alert and return
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;DEBUGF 1, 'APP_STARTUP_THUNK@dll.obj: App twice/with app_version < 2 has entered!\n'
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ret
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; } APP_STARTUP_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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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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dd APP_STARTUP_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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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' ;
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