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84 lines
2.0 KiB
84 lines
2.0 KiB
"\n\
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;\n\
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; Wrap.ASM - i386\n\
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;\n\
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; Copyright(C) 1994 Microsoft Corporation\n\
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; All rights reserved\n\
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;\n\
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; This is the workhorse routine in Wrapper. This routine is jumped\n\
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; to by the ZAPI macros. It calls the __prelude@8 and __postlude@8 routines\n\
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; before and after calling the real API.\n\
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;\n\
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\n\
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\n\
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.386\n\
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OPTION CASEMAP:NONE\n\
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_TEXT SEGMENT DWORD USE32 PUBLIC 'CODE'\n\
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\n\
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ASSUME DS:NOTHING, ES:NOTHING, SS:FLAT, FS:NOTHING, GS:NOTHING\n\
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\n\
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extrn __prelude@8:near\n\
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extrn __postlude@8:near\n\
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;\n\
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; _wrapit\n\
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;\n\
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; When _wrapit is hit the stack looks like:\n\
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;\n\
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; -----------\n\
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; EBP->| API ID |\n\
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; -----------\n\
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; +4 ->| Call ESP |\n\
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; -----------\n\
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; +8 ->| Call stack..\n\
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\n\
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_wrapit:\n\
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\n\
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; The Id and ESP simply get passed on\n\
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call __prelude@8\n\
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\n\
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pop edx ; scratch the orignal return address\n\
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\n\
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; return from prelude is the address of the routine to\n\
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; call. If not 0 then call it\n\
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cmp eax, 0\n\
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je _api_done\n\
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\n\
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call eax\n\
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\n\
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_api_done: \n\
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push eax ; Make room on stack for return address\n\
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push esp ; pass pointer to return address\n\
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push eax ; pass return value\n\
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call __postlude@8\n\
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\n\
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ret ; continue ....\n\
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\n\
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\n\
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ZAPI MACRO id, APIName\n\
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\n\
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PUBLIC z&APIName\n\
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z&APIName PROC\n\
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\n\
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push esp ; address of stack\n\
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push id ; push the API id\n\
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jmp _wrapit ;\n\
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\n\
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z&APIName ENDP \n\
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\n\
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ENDM\n\
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\n\
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\n\
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%a ZAPI %i, %A\n\
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\n\
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PUBLIC _zWrapperNothing@0\n\
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_zWrapperNothing@0 PROC\n\
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\n\
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push esp ; address of stack\n\
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push %c ; push the API id\n\
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jmp _wrapit ;\n\
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\n\
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_zWrapperNothing@0 ENDP \n\
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\n\
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\n\
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_TEXT ENDS\n\
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END\n"
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