334 lines
9.0 KiB
C
334 lines
9.0 KiB
C
/*
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* 386-specific Win16 dll<->dll snooping functions
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*
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* Copyright 1998 Marcus Meissner
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*/
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#include <assert.h>
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#include <string.h>
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#include "winbase.h"
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#include "winnt.h"
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#include "heap.h"
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#include "global.h"
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#include "selectors.h"
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#include "stackframe.h"
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#include "snoop.h"
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#include "debugstr.h"
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#include "debug.h"
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DEFAULT_DEBUG_CHANNEL(snoop)
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#ifdef __i386__
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#include "pshpack1.h"
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void WINAPI SNOOP16_Entry(CONTEXT *context);
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void WINAPI SNOOP16_Return(CONTEXT *context);
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extern void CallFrom16_p_regs_();
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/* Generic callfrom16_p_regs function entry.
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* pushw %bp 0x55
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* pushl $DOS3Call DWORD fun32
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* .byte 0x9a 0x9a
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* .long CallFrom16_p_regs_ DWORD addr
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* .long 0x90900023 WORD seg;nop;nop
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*/
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typedef struct tagSNOOP16_FUN {
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/* code part */
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BYTE lcall; /* 0x9a call absolute with segment */
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DWORD snr;
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/* unreached */
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int nrofargs;
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FARPROC16 origfun;
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char *name;
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} SNOOP16_FUN;
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typedef struct tagSNOOP16_DLL {
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HMODULE16 hmod;
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HANDLE16 funhandle;
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SNOOP16_FUN *funs;
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LPCSTR name;
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struct tagSNOOP16_DLL *next;
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} SNOOP16_DLL;
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typedef struct tagSNOOP16_RETURNENTRY {
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/* code part */
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BYTE lcall; /* 0x9a call absolute with segment */
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DWORD snr;
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/* unreached */
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FARPROC16 origreturn;
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SNOOP16_DLL *dll;
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DWORD ordinal;
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WORD origSP;
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WORD *args; /* saved args across a stdcall */
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} SNOOP16_RETURNENTRY;
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typedef struct tagSNOOP16_RETURNENTRIES {
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SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
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HANDLE16 rethandle;
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struct tagSNOOP16_RETURNENTRIES *next;
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} SNOOP16_RETURNENTRIES;
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typedef struct tagSNOOP16_RELAY {
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/* code part */
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BYTE prefix; /* 0x66 , 32bit prefix */
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BYTE pushbp; /* 0x55 */
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BYTE pushl; /* 0x68 */
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DWORD realfun; /* SNOOP16_Return */
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BYTE lcall; /* 0x9a call absolute with segment */
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DWORD callfromregs;
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WORD seg;
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/* unreached */
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} SNOOP16_RELAY;
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#include "poppack.h"
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static SNOOP16_DLL *firstdll = NULL;
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static SNOOP16_RETURNENTRIES *firstrets = NULL;
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static SNOOP16_RELAY *snr;
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static HANDLE16 xsnr = 0;
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void
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SNOOP16_RegisterDLL(NE_MODULE *pModule,LPCSTR name) {
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SNOOP16_DLL **dll = &(firstdll);
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char *s;
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if (!TRACE_ON(snoop)) return;
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if (!snr) {
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xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,TRUE,TRUE,FALSE);
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snr = GlobalLock16(xsnr);
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snr[0].prefix = 0x66;
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snr[0].pushbp = 0x55;
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snr[0].pushl = 0x68;
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snr[0].realfun = (DWORD)SNOOP16_Entry;
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snr[0].lcall = 0x9a;
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snr[0].callfromregs = (DWORD)CallFrom16_p_regs_;
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GET_CS(snr[0].seg);
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snr[1].prefix = 0x66;
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snr[1].pushbp = 0x55;
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snr[1].pushl = 0x68;
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snr[1].realfun = (DWORD)SNOOP16_Return;
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snr[1].lcall = 0x9a;
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snr[1].callfromregs = (DWORD)CallFrom16_p_regs_;
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GET_CS(snr[1].seg);
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}
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while (*dll) {
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if ((*dll)->hmod == pModule->self)
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return; /* already registered */
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dll = &((*dll)->next);
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}
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*dll = (SNOOP16_DLL*)HeapAlloc(SystemHeap,HEAP_ZERO_MEMORY,sizeof(SNOOP16_DLL));
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(*dll)->next = NULL;
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(*dll)->hmod = pModule->self;
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if ((s=strrchr(name,'\\')))
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name = s+1;
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(*dll)->name = HEAP_strdupA(SystemHeap,0,name);
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if ((s=strrchr((*dll)->name,'.')))
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*s='\0';
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(*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,TRUE,FALSE,FALSE));
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(*dll)->funs = GlobalLock16((*dll)->funhandle);
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if (!(*dll)->funs) {
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HeapFree(SystemHeap,0,*dll);
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FIXME(snoop,"out of memory\n");
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return;
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}
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memset((*dll)->funs,0,65535);
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}
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FARPROC16
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SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
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SNOOP16_DLL *dll = firstdll;
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SNOOP16_FUN *fun;
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NE_MODULE *pModule = NE_GetPtr(hmod);
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unsigned char *cpnt;
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char name[200];
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if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
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return origfun;
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if (!*(LPBYTE)PTR_SEG_TO_LIN(origfun)) /* 0x00 is an imposs. opcode, poss. dataref. */
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return origfun;
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while (dll) {
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if (hmod == dll->hmod)
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break;
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dll=dll->next;
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}
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if (!dll) /* probably internal */
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return origfun;
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if (ordinal>65535/sizeof(SNOOP16_FUN))
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return origfun;
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fun = dll->funs+ordinal;
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/* already done? */
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fun->lcall = 0x9a;
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fun->snr = MAKELONG(0,xsnr);
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fun->origfun = origfun;
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if (fun->name)
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return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
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cpnt = (unsigned char *)pModule + pModule->name_table;
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while (*cpnt) {
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cpnt += *cpnt + 1 + sizeof(WORD);
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if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
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sprintf(name,"%.*s",*cpnt,cpnt+1);
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break;
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}
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}
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/* Now search the non-resident names table */
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if (!*cpnt && pModule->nrname_handle) {
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cpnt = (char *)GlobalLock16( pModule->nrname_handle );
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while (*cpnt) {
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cpnt += *cpnt + 1 + sizeof(WORD);
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if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
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sprintf(name,"%.*s",*cpnt,cpnt+1);
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break;
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}
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}
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}
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if (*cpnt)
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fun->name = HEAP_strdupA(SystemHeap,0,name);
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else
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fun->name = HEAP_strdupA(SystemHeap,0,"");
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if (!SNOOP_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
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return origfun;
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/* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
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if (strchr(fun->name,'_')) {
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char *s=strchr(fun->name,'_');
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if (!strncasecmp(s,"_thunkdata",10)) {
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HeapFree(SystemHeap,0,fun->name);
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fun->name = NULL;
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return origfun;
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}
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}
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fun->lcall = 0x9a;
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fun->snr = MAKELONG(0,xsnr);
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fun->origfun = origfun;
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fun->nrofargs = -1;
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return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
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}
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#define CALLER1REF (*(DWORD*)(PTR_SEG_OFF_TO_LIN(SS_reg(context),SP_reg(context)+4)))
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void WINAPI SNOOP16_Entry(CONTEXT *context) {
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DWORD ordinal=0;
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DWORD entry=(DWORD)PTR_SEG_OFF_TO_LIN(CS_reg(context),IP_reg(context))-5;
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WORD xcs = CS_reg(context);
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SNOOP16_DLL *dll = firstdll;
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SNOOP16_FUN *fun = NULL;
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SNOOP16_RETURNENTRIES **rets = &firstrets;
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SNOOP16_RETURNENTRY *ret;
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int i,max;
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while (dll) {
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if (xcs == dll->funhandle) {
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fun = (SNOOP16_FUN*)entry;
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ordinal = fun-dll->funs;
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break;
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}
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dll=dll->next;
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}
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if (!dll) {
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FIXME(snoop,"entrypoint 0x%08lx not found\n",entry);
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return; /* oops */
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}
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while (*rets) {
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for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
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if (!(*rets)->entry[i].origreturn)
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break;
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if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
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break;
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rets = &((*rets)->next);
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}
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if (!*rets) {
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HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,TRUE,FALSE,FALSE));
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*rets = GlobalLock16(hand);
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memset(*rets,0,65535);
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(*rets)->rethandle = hand;
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i = 0; /* entry 0 is free */
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}
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ret = &((*rets)->entry[i]);
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ret->lcall = 0x9a;
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ret->snr = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
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ret->origreturn = (FARPROC16)CALLER1REF;
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CALLER1REF = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
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ret->dll = dll;
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ret->args = NULL;
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ret->ordinal = ordinal;
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ret->origSP = SP_reg(context);
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IP_reg(context)= LOWORD(fun->origfun);
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CS_reg(context)= HIWORD(fun->origfun);
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DPRINTF("Call %s.%ld: %s(",dll->name,ordinal,fun->name);
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if (fun->nrofargs>0) {
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max = fun->nrofargs;
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if (max>16) max=16;
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for (i=max;i--;)
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DPRINTF("%04x%s",*(WORD*)(PTR_SEG_OFF_TO_LIN(SS_reg(context),SP_reg(context))+8+sizeof(WORD)*i),i?",":"");
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if (max!=fun->nrofargs)
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DPRINTF(" ...");
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} else if (fun->nrofargs<0) {
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DPRINTF("<unknown, check return>");
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ret->args = HeapAlloc(SystemHeap,0,16*sizeof(WORD));
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memcpy(ret->args,(LPBYTE)(PTR_SEG_OFF_TO_LIN(SS_reg(context),SP_reg(context))+8),sizeof(WORD)*16);
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}
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DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
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}
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void WINAPI SNOOP16_Return(CONTEXT *context) {
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SNOOP16_RETURNENTRY *ret = (SNOOP16_RETURNENTRY*)(PTR_SEG_OFF_TO_LIN(CS_reg(context),IP_reg(context))-5);
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/* We haven't found out the nrofargs yet. If we called a cdecl
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* function it is too late anyway and we can just set '0' (which
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* will be the difference between orig and current SP
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* If pascal -> everything ok.
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*/
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if (ret->dll->funs[ret->ordinal].nrofargs<0) {
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ret->dll->funs[ret->ordinal].nrofargs=(SP_reg(context)-ret->origSP-4)/2;
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}
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IP_reg(context) = LOWORD(ret->origreturn);
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CS_reg(context) = HIWORD(ret->origreturn);
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if (ret->args) {
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int i,max;
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DPRINTF("Ret %s.%ld: %s(",ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name);
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max = ret->dll->funs[ret->ordinal].nrofargs;
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if (max>16)
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max=16;
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if (max<0)
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max=0;
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for (i=max;i--;)
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DPRINTF("%04x%s",ret->args[i],i?",":"");
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if (max!=ret->dll->funs[ret->ordinal].nrofargs)
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DPRINTF(" ...");
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DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
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DX_reg(context),AX_reg(context),HIWORD(ret->origreturn),LOWORD(ret->origreturn)
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);
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HeapFree(SystemHeap,0,ret->args);
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ret->args = NULL;
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} else
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DPRINTF("Ret %s.%ld: %s() retval = %04x:%04x ret=%04x:%04x\n",
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ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name,
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DX_reg(context),AX_reg(context),HIWORD(ret->origreturn),LOWORD(ret->origreturn)
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);
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ret->origreturn = NULL; /* mark as empty */
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}
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#else /* !__i386__ */
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void SNOOP16_RegisterDLL(NE_MODULE *pModule,LPCSTR name) {
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FIXME(snoop,"snooping works only on i386 for now.\n");
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return;
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}
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FARPROC16 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
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return origfun;
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}
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#endif /* !__i386__ */
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void
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SNOOP16_Init() {
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fnSNOOP16_GetProcAddress16=SNOOP16_GetProcAddress16;
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fnSNOOP16_RegisterDLL=SNOOP16_RegisterDLL;
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}
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