169 lines
3.7 KiB
NASM
169 lines
3.7 KiB
NASM
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include 'proc32.inc'
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DLL_ENTRY equ 1
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DLL_EXIT equ -1
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REQ_DLL_VER equ 3
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use32
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db 'MENUET01'
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dd 1
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dd start
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dd i_end
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dd mem
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dd mem
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dd 0
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dd 0
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start:
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stdcall load_dll_and_import, dllname, imports
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test eax, eax
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jz exit
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; check version
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cmp word [dll_ver], REQ_DLL_VER
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jb exit
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cmp word [dll_ver+2], REQ_DLL_VER
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ja exit
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push DLL_ENTRY
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call [dll_start]
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; yes! Now do some work (getch() demo in this case).
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push caption
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push -1
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push -1
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push -1
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push -1
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call [con_init]
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; C-equivalent of the following code:
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; con_printf(start_string);
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; int c;
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; while ((c=con_getch())!=27) // Esc=exit
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; {
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; if (c)
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; con_printf("normal character with code %d=0x%02X\n",c,c);
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; else
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; {
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; c=con_getch();
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; con_printf("extended character with code %d=0x%02X\n",c,c);
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; }
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; }
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push start_string
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call [con_printf]
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pop ecx
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mainloop:
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call [con_getch]
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cmp al, 27
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jz done
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test eax, eax
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jz extended
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push eax
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push eax
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push string_normal
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@@:
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call [con_printf]
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add esp, 12
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jmp mainloop
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extended:
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call [con_getch]
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test eax, eax
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jz done
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push eax
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push eax
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push string_extended
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jmp @b
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done:
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push 1
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call [con_exit]
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exit:
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or eax, -1
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int 0x40
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proc load_dll_and_import stdcall, _dllname:dword, _imports:dword
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pushad
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; load DLL
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push 68
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pop eax
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push 19
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pop ebx
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mov ecx, [_dllname]
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int 0x40
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test eax, eax
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jz import_fail
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; initialize import
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mov edi, eax
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mov esi, [_imports]
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import_loop:
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lodsd
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test eax, eax
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jz import_done
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mov edx, edi
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import_find:
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mov ebx, [edx]
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test ebx, ebx
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jz import_not_found
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push eax
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@@:
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mov cl, [eax]
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cmp cl, [ebx]
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jnz import_find_next
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test cl, cl
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jz import_found
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inc eax
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inc ebx
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jmp @b
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import_find_next:
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pop eax
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add edx, 8
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jmp import_find
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import_found:
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pop eax
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mov eax, [edx+4]
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mov [esi-4], eax
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jmp import_loop
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import_not_found:
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import_fail:
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popad
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xor eax, eax
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ret
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import_done:
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popad
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xor eax, eax
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inc eax
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ret
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endp
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align 4
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imports:
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dll_start dd szStart
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dll_ver dd szVersion
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con_init dd szcon_init
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con_printf dd szcon_printf
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con_exit dd szcon_exit
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con_getch dd szcon_getch
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dd 0
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szStart db 'START',0
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szVersion db 'version',0
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szcon_init db 'con_init',0
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szcon_printf db 'con_printf',0
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szcon_exit db 'con_exit',0
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szcon_getch db 'con_getch',0
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dllname db '/sys/lib/console.obj',0
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caption db 'Console test - getch()',0
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start_string db 'Press any key to see its code, or Esc to exit',10,0
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string_normal db 'normal character with code %d=0x%02X',10,0
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string_extended db 'extended character with code %d=0x%02X',10,0
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i_end:
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align 4
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rb 2048 ; stack
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mem:
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