/* * tclWin32Dll.c -- * * This file contains the DLL entry point and other low-level bit bashing * code that needs inline assembly. * * Copyright © 1995-1996 Sun Microsystems, Inc. * Copyright © 1998-2000 Scriptics Corporation. * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "tclWinInt.h" #if defined(HAVE_INTRIN_H) # include #endif /* * The following variables keep track of information about this DLL on a * per-instance basis. Each time this DLL is loaded, it gets its own new data * segment with its own copy of all static and global information. */ static HINSTANCE hInstance; /* HINSTANCE of this DLL. */ /* * The following declaration is for the VC++ DLL entry point. */ BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved); /* * The following structure and linked list is to allow us to map between * volume mount points and drive letters on the fly (no Win API exists for * this). */ typedef struct MountPointMap { WCHAR *volumeName; /* Native wide string volume name. */ WCHAR driveLetter; /* Drive letter corresponding to the volume * name. */ struct MountPointMap *nextPtr; /* Pointer to next structure in list, or * NULL. */ } MountPointMap; /* * This is the head of the linked list, which is protected by the mutex which * follows, for thread-enabled builds. */ MountPointMap *driveLetterLookup = NULL; TCL_DECLARE_MUTEX(mountPointMap) /* * We will need this below. */ #ifdef _WIN32 #ifndef STATIC_BUILD /* *---------------------------------------------------------------------- * * DllEntryPoint -- * * This wrapper function is used by Borland to invoke the initialization * code for Tcl. It simply calls the DllMain routine. * * Results: * See DllMain. * * Side effects: * See DllMain. * *---------------------------------------------------------------------- */ BOOL APIENTRY DllEntryPoint( HINSTANCE hInst, /* Library instance handle. */ DWORD reason, /* Reason this function is being called. */ LPVOID reserved) { return DllMain(hInst, reason, reserved); } /* *---------------------------------------------------------------------- * * DllMain -- * * This routine is called by the VC++ C run time library init code, or * the DllEntryPoint routine. It is responsible for initializing various * dynamically loaded libraries. * * Results: * TRUE on sucess, FALSE on failure. * * Side effects: * Initializes most rudimentary Windows bits. * *---------------------------------------------------------------------- */ BOOL APIENTRY DllMain( HINSTANCE hInst, /* Library instance handle. */ DWORD reason, /* Reason this function is being called. */ TCL_UNUSED(LPVOID)) { switch (reason) { case DLL_PROCESS_ATTACH: DisableThreadLibraryCalls(hInst); TclWinInit(hInst); return TRUE; /* * DLL_PROCESS_DETACH is unnecessary as the user should call * Tcl_Finalize explicitly before unloading Tcl. */ } return TRUE; } #endif /* !STATIC_BUILD */ #endif /* _WIN32 */ /* *---------------------------------------------------------------------- * * TclWinGetTclInstance -- * * Retrieves the global library instance handle. * * Results: * Returns the global library instance handle. * * Side effects: * None. * *---------------------------------------------------------------------- */ void * TclWinGetTclInstance(void) { return hInstance; } /* *---------------------------------------------------------------------- * * TclWinInit -- * * This function initializes the internal state of the tcl library. * * Results: * None. * * Side effects: * Initializes the tclPlatformId variable. * *---------------------------------------------------------------------- */ void TclWinInit( HINSTANCE hInst) /* Library instance handle. */ { OSVERSIONINFOW os; hInstance = hInst; os.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW); GetVersionExW(&os); /* * We no longer support Win32s or Win9x or Windows CE or Windows XP, so just * in case someone manages to get a runtime there, make sure they know that. */ if (os.dwPlatformId != VER_PLATFORM_WIN32_NT) { Tcl_Panic("Windows 7 is the minimum supported platform"); } } /* *------------------------------------------------------------------------- * * TclWinNoBackslash -- * * We're always iterating through a string in Windows, changing the * backslashes to slashes for use in Tcl. * * Results: * All backslashes in given string are changed to slashes. * * Side effects: * None. * *------------------------------------------------------------------------- */ char * TclWinNoBackslash( char *path) /* String to change. */ { char *p; for (p = path; *p != '\0'; p++) { if (*p == '\\') { *p = '/'; } } return path; } /* *--------------------------------------------------------------------------- * * TclWinEncodingsCleanup -- * * Called during finalization to clean up any memory allocated in our * mount point map which is used to follow certain kinds of symlinks. * * Results: * None. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void TclWinEncodingsCleanup(void) { MountPointMap *dlIter, *dlIter2; /* * Clean up the mount point map. */ Tcl_MutexLock(&mountPointMap); dlIter = driveLetterLookup; while (dlIter != NULL) { dlIter2 = dlIter->nextPtr; Tcl_Free(dlIter->volumeName); Tcl_Free(dlIter); dlIter = dlIter2; } Tcl_MutexUnlock(&mountPointMap); } /* *-------------------------------------------------------------------- * * TclWinDriveLetterForVolMountPoint * * Unfortunately, Windows provides no easy way at all to get hold of the * drive letter for a volume mount point, but we need that information to * understand paths correctly. So, we have to build an associated array * to find these correctly, and allow quick and easy lookup from volume * mount points to drive letters. * * We assume here that we are running on a system for which the wide * character interfaces are used, which is valid for Win 2000 and WinXP * which are the only systems on which this function will ever be called. * * Result: * The drive letter, or -1 if no drive letter corresponds to the given * mount point. * *-------------------------------------------------------------------- */ char TclWinDriveLetterForVolMountPoint( const WCHAR *mountPoint) { MountPointMap *dlIter, *dlPtr2; WCHAR Target[55]; /* Target of mount at mount point */ WCHAR drive[4] = L"A:\\"; /* * Detect the volume mounted there. Unfortunately, there is no simple way * to map a unique volume name to a DOS drive letter. So, we have to build * an associative array. */ Tcl_MutexLock(&mountPointMap); dlIter = driveLetterLookup; while (dlIter != NULL) { if (wcscmp(dlIter->volumeName, mountPoint) == 0) { /* * We need to check whether this information is still valid, since * either the user or various programs could have adjusted the * mount points on the fly. */ drive[0] = (WCHAR) dlIter->driveLetter; /* * Try to read the volume mount point and see where it points. */ if (GetVolumeNameForVolumeMountPointW(drive, Target, 55) != 0) { if (wcscmp(dlIter->volumeName, Target) == 0) { /* * Nothing has changed. */ Tcl_MutexUnlock(&mountPointMap); return (char) dlIter->driveLetter; } } /* * If we reach here, unfortunately, this mount point is no longer * valid at all. */ if (driveLetterLookup == dlIter) { dlPtr2 = dlIter; driveLetterLookup = dlIter->nextPtr; } else { for (dlPtr2 = driveLetterLookup; dlPtr2 != NULL; dlPtr2 = dlPtr2->nextPtr) { if (dlPtr2->nextPtr == dlIter) { dlPtr2->nextPtr = dlIter->nextPtr; dlPtr2 = dlIter; break; } } } /* * Now dlPtr2 points to the structure to free. */ Tcl_Free(dlPtr2->volumeName); Tcl_Free(dlPtr2); /* * Restart the loop - we could try to be clever and continue half * way through, but the logic is a bit messy, so it's cleanest * just to restart. */ dlIter = driveLetterLookup; continue; } dlIter = dlIter->nextPtr; } /* * We couldn't find it, so we must iterate over the letters. */ for (drive[0] = 'A'; drive[0] <= 'Z'; drive[0]++) { /* * Try to read the volume mount point and see where it points. */ if (GetVolumeNameForVolumeMountPointW(drive, Target, 55) != 0) { int alreadyStored = 0; for (dlIter = driveLetterLookup; dlIter != NULL; dlIter = dlIter->nextPtr) { if (wcscmp(dlIter->volumeName, Target) == 0) { alreadyStored = 1; break; } } if (!alreadyStored) { dlPtr2 = (MountPointMap *)Tcl_Alloc(sizeof(MountPointMap)); dlPtr2->volumeName = (WCHAR *)TclNativeDupInternalRep(Target); dlPtr2->driveLetter = (char) drive[0]; dlPtr2->nextPtr = driveLetterLookup; driveLetterLookup = dlPtr2; } } } /* * Try again. */ for (dlIter = driveLetterLookup; dlIter != NULL; dlIter = dlIter->nextPtr) { if (wcscmp(dlIter->volumeName, mountPoint) == 0) { Tcl_MutexUnlock(&mountPointMap); return (char) dlIter->driveLetter; } } /* * The volume doesn't appear to correspond to a drive letter - we remember * that fact and store '-1' so we don't have to look it up each time. */ dlPtr2 = (MountPointMap *)Tcl_Alloc(sizeof(MountPointMap)); dlPtr2->volumeName = (WCHAR *)TclNativeDupInternalRep((void *)mountPoint); dlPtr2->driveLetter = -1; dlPtr2->nextPtr = driveLetterLookup; driveLetterLookup = dlPtr2; Tcl_MutexUnlock(&mountPointMap); return -1; } /* *------------------------------------------------------------------------ * * TclWinCPUID -- * * Get CPU ID information on an Intel box under Windows * * Results: * Returns TCL_OK if successful, TCL_ERROR if CPUID is not supported or * fails. * * Side effects: * If successful, stores EAX, EBX, ECX and EDX registers after the CPUID * instruction in the four integers designated by 'regsPtr' * *---------------------------------------------------------------------- */ int TclWinCPUID( int index, /* Which CPUID value to retrieve. */ int *regsPtr) /* Registers after the CPUID. */ { int status = TCL_ERROR; #if defined(HAVE_INTRIN_H) && defined(_WIN64) && defined(HAVE_CPUID) __cpuid((int *)regsPtr, index); status = TCL_OK; #elif defined(__GNUC__) && defined(HAVE_CPUID) # if defined(_WIN64) /* * Execute the CPUID instruction with the given index, and store results * off 'regPtr'. */ __asm__ __volatile__( /* * Do the CPUID instruction, and save the results in the 'regsPtr' * area. */ "movl %[rptr], %%edi" "\n\t" "movl %[index], %%eax" "\n\t" "cpuid" "\n\t" "movl %%eax, 0x0(%%edi)" "\n\t" "movl %%ebx, 0x4(%%edi)" "\n\t" "movl %%ecx, 0x8(%%edi)" "\n\t" "movl %%edx, 0xC(%%edi)" "\n\t" : /* No outputs */ : [index] "m" (index), [rptr] "m" (regsPtr) : "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); status = TCL_OK; # else TCLEXCEPTION_REGISTRATION registration; /* * Execute the CPUID instruction with the given index, and store results * off 'regPtr'. */ __asm__ __volatile__( /* * Construct an TCLEXCEPTION_REGISTRATION to protect the CPUID * instruction (early 486's don't have CPUID) */ "leal %[registration], %%edx" "\n\t" "movl %%fs:0, %%eax" "\n\t" "movl %%eax, 0x0(%%edx)" "\n\t" /* link */ "leal 1f, %%eax" "\n\t" "movl %%eax, 0x4(%%edx)" "\n\t" /* handler */ "movl %%ebp, 0x8(%%edx)" "\n\t" /* ebp */ "movl %%esp, 0xC(%%edx)" "\n\t" /* esp */ "movl %[error], 0x10(%%edx)" "\n\t" /* status */ /* * Link the TCLEXCEPTION_REGISTRATION on the chain */ "movl %%edx, %%fs:0" "\n\t" /* * Do the CPUID instruction, and save the results in the 'regsPtr' * area. */ "movl %[rptr], %%edi" "\n\t" "movl %[index], %%eax" "\n\t" "cpuid" "\n\t" "movl %%eax, 0x0(%%edi)" "\n\t" "movl %%ebx, 0x4(%%edi)" "\n\t" "movl %%ecx, 0x8(%%edi)" "\n\t" "movl %%edx, 0xC(%%edi)" "\n\t" /* * Come here on a normal exit. Recover the TCLEXCEPTION_REGISTRATION and * store a TCL_OK status. */ "movl %%fs:0, %%edx" "\n\t" "movl %[ok], %%eax" "\n\t" "movl %%eax, 0x10(%%edx)" "\n\t" "jmp 2f" "\n" /* * Come here on an exception. Get the TCLEXCEPTION_REGISTRATION that we * previously put on the chain. */ "1:" "\t" "movl %%fs:0, %%edx" "\n\t" "movl 0x8(%%edx), %%edx" "\n\t" /* * Come here however we exited. Restore context from the * TCLEXCEPTION_REGISTRATION in case the stack is unbalanced. */ "2:" "\t" "movl 0xC(%%edx), %%esp" "\n\t" "movl 0x8(%%edx), %%ebp" "\n\t" "movl 0x0(%%edx), %%eax" "\n\t" "movl %%eax, %%fs:0" "\n\t" : /* No outputs */ : [index] "m" (index), [rptr] "m" (regsPtr), [registration] "m" (registration), [ok] "i" (TCL_OK), [error] "i" (TCL_ERROR) : "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); status = registration.status; # endif /* !_WIN64 */ #elif defined(_MSC_VER) && defined(HAVE_CPUID) # if defined(_WIN64) __cpuid(regsPtr, index); status = TCL_OK; # elif defined (_M_IX86) /* * Define a structure in the stack frame to hold the registers. */ struct { DWORD dw0; DWORD dw1; DWORD dw2; DWORD dw3; } regs; regs.dw0 = index; /* * Execute the CPUID instruction and save regs in the stack frame. */ _try { _asm { push ebx push ecx push edx mov eax, regs.dw0 cpuid mov regs.dw0, eax mov regs.dw1, ebx mov regs.dw2, ecx mov regs.dw3, edx pop edx pop ecx pop ebx } /* * Copy regs back out to the caller. */ regsPtr[0] = regs.dw0; regsPtr[1] = regs.dw1; regsPtr[2] = regs.dw2; regsPtr[3] = regs.dw3; status = TCL_OK; } __except(EXCEPTION_EXECUTE_HANDLER) { /* do nothing */ } # endif #else (void)index; (void)regsPtr; /* * Don't know how to do assembly code for this compiler and/or * architecture. */ #endif return status; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */