forked from KolibriOS/kolibrios
139 lines
3.1 KiB
NASM
139 lines
3.1 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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__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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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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;DEBUGF ' path "%s"\n params "%s"\n', .path, .params
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; check for overflow
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;; that not work
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; mov al, [path+buf_len-1]
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; or al, [params+buf_len-1]
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; jnz .crash
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; check if path written by OS
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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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.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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;DEBUGF 'call main(%x, %x) with params:\n', [argc], argv
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if __DEBUG__ = 1
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mov ecx, [argc]
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@@:
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lea esi, [ecx * 4 + argv-4]
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DEBUGF '0x%x) "%s"\n', cx, [esi]
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loop @b
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end if
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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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;DEBUGF 'Exit from prog\n';
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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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;DEBUGF 'E:buffer overflowed\n'
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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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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 |