forked from KolibriOS/kolibrios
221 lines
5.8 KiB
NASM
221 lines
5.8 KiB
NASM
format ELF
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section '.text' executable
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public start
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public start as '_start'
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;extrn mf_init
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extrn main
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;include 'debug2.inc'
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include '..\..\..\..\..\proc32.inc'
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include '..\..\..\..\..\macros.inc'
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include '..\..\..\..\..\dll.inc'
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__DEBUG__=0
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;start_:
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virtual at 0
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db 'MENUET01' ; 1. Magic number (8 bytes)
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dd 0x01 ; 2. Version of executable file
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dd start ; 3. Start address
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imgsz dd 0x0 ; 4. Size of image
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dd 0x100000 ; 5. Size of needed memory
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dd 0x100000 ; 6. Pointer to stack
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hparams dd 0x0 ; 7. Pointer to program arguments
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hpath dd 0x0 ; 8. Pointer to program path
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end virtual
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start:
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;DEBUGF 'Start programm\n'
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;init heap of memory
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mov eax,68
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mov ebx,11
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int 0x40
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mov [argc], 0
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mov eax, [hparams]
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test eax, eax
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jz .without_path
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mov eax, path
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cmp word ptr eax, 32fh ; '/#3' UTF8
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jne .without_path
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mov word ptr eax, 12fh ; '/#1' fix to CP866
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.without_path:
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mov esi, eax
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call push_param
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; retrieving parameters
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mov esi, params
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xor edx, edx ; dl - èä¸ò ïàðàìåòð(1) èëè ðàçäåëèòåëè(0)
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; dh - ñèìâîë ñ êîòîðîãî íà÷àëñÿ ïàðàìåòð (1 êàâû÷êè, 0 îñòàëüíîå)
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mov ecx, 1 ; cl = 1
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; ch = 0 ïðîñòî íîëü
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.parse:
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lodsb
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test al, al
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jz .run
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test dl, dl
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jnz .findendparam
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;{åñëè áûë ðàçäåëèòåëü
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cmp al, ' '
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jz .parse ;çàãðóæåí ïðîáåë, ãðóçèì ñëåäóþùèé ñèìâîë
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mov dl, cl ;íà÷èíàåòñÿ ïàðàìåòð
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cmp al, '"'
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jz @f ;çàãðóæåíû êàâû÷êè
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mov dh, ch ;ïàðàìåòð áåç êàâû÷åê
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dec esi
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call push_param
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inc esi
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jmp .parse
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@@:
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mov dh, cl ;ïàðàìåòð â êàâû÷åêàõ
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call push_param ;åñëè íå ïðîáåë çíà÷èò íà÷èíàåòñÿ êàêîé òî ïàðàìåòð
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jmp .parse ;åñëè áûë ðàçäåëèòåëü}
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.findendparam:
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test dh, dh
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jz @f ; áåç êàâû÷åê
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cmp al, '"'
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jz .clear
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jmp .parse
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@@:
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cmp al, ' '
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jnz .parse
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.clear:
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lea ebx, [esi - 1]
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mov [ebx], ch
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mov dl, ch
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jmp .parse
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.run:
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call load_imports
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push argv
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push [argc]
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call main
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.exit:
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xor eax,eax
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dec eax
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int 0x40
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dd -1
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.crash:
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jmp .exit
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;============================
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push_param:
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;============================
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;parameters
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; esi - pointer
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;description
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; procedure increase argc
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; and add pointer to array argv
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; procedure changes ebx
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mov ebx, [argc]
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cmp ebx, max_parameters
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jae .dont_add
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mov [argv+4*ebx], esi
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inc [argc]
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.dont_add:
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ret
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;==============================
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;==============================
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load_imports:
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;==============================
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;parameters
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; none
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;description
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; imports must be located at end of image (but before BSS sections)
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; the address of end of imports (next byte after imports) is located in imgsz
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; look at each import from that address up to illegal import
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; legal import is such that:
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; first pointer points to procedure name
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; and is smaller than imgsz
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; second pointer points lo library name, starting with 0x55, 0xAA
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; and is smaller than imgsz
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; each library should be initialized as appropriate, once
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; so as library is initialized, its name will be replaced 0x00
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mov ebx, [imgsz] ; byte after imports
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.handle_next_import:
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sub ebx, 4 ; ebx = pointer to pointer to library name
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mov esi, dword[ebx] ; esi = pointer to library name
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push ebx
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push esi
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call load_library ; eax = pointer to library exports
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pop esi
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pop ebx
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test eax, eax
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jz .done
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sub ebx, 4 ; ebx = pointer to pointer to symbol name
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push ebx
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stdcall dll.GetProcAddress, eax, dword[ebx]
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pop ebx
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test eax, eax
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jz .fail
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mov dword[ebx], eax
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jmp .handle_next_import
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.done:
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ret
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.fail:
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ret
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;==============================
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;==============================
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load_library:
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;==============================
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;parameters
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; ebx: library name address
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;description
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; each library should be initialized as appropriate, once
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; so as library is initialized, its name will be replaced 0x00
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; and 4 next bytes will be set to address of library
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; first two bytes of library name must be 0x55, 0xAA (is like a magic)
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cld ; move esi further, not back
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cmp esi, [imgsz]
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ja .fail
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lodsb ; al = first byte of library name
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cmp al, 0x55
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jne .fail
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lodsb ; al = second byte of library name
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cmp al, 0xAA
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jne .fail
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lodsb ; al = third byte of library name (0x00 if the library is already loaded)
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test al, al
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jnz .load
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lodsd ; if we here, then third byte is 0x00 => address of library is in next 4 bytes
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; now eax contains address of library
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ret
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.load:
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dec esi ; we checked on 0 before, let's go back
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mov eax, 68
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mov ebx, 19
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mov ecx, esi
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int 0x40 ; eax = address of exports
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mov byte[esi], 0 ; library is loaded, let's place 0 in first byte of name
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mov [esi + 1], eax ; now next 4 bytes of library name are replaced by address of library
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; call lib_init
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stdcall dll.GetProcAddress, eax, lib_init_str ; eax = address of lib_init
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test eax, eax
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jz .ret
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stdcall dll.Init, eax
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.ret:
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mov eax, [esi + 1] ; put address of library into eax
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ret
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.fail:
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mov eax, 0
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ret
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;==============================
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lib_init_str db 'lib_init', 0
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public argc as '__argc'
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public params as '__argv'
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public path as '__path'
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section '.bss'
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buf_len = 0x400
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max_parameters=0x20
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argc rd 1
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argv rd max_parameters
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path rb buf_len
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params rb buf_len
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;section '.data'
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;include_debug_strings ; ALWAYS present in data section
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