diff options
Diffstat (limited to 'win')
| -rw-r--r-- | win/tkWin32Dll.c | 196 |
1 files changed, 92 insertions, 104 deletions
diff --git a/win/tkWin32Dll.c b/win/tkWin32Dll.c index bf9ba29..958fdb4 100644 --- a/win/tkWin32Dll.c +++ b/win/tkWin32Dll.c @@ -8,33 +8,27 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tkWin32Dll.c,v 1.6.2.2 2004/10/28 20:11:20 mdejong Exp $ + * RCS: @(#) $Id: tkWin32Dll.c,v 1.6.2.3 2005/08/23 18:34:49 mdejong Exp $ */ #include "tkWinInt.h" #ifndef STATIC_BUILD -#if defined(HAVE_NO_SEH) && defined(TCL_MEM_DEBUG) -static void *INITIAL_ESP, - *INITIAL_EBP, - *INITIAL_HANDLER, - *RESTORED_ESP, - *RESTORED_EBP, - *RESTORED_HANDLER; -#endif /* HAVE_NO_SEH && TCL_MEM_DEBUG */ - #ifdef HAVE_NO_SEH -static -__attribute__ ((cdecl)) -EXCEPTION_DISPOSITION -_except_dllmain_detach_handler( - struct _EXCEPTION_RECORD *ExceptionRecord, - void *EstablisherFrame, - struct _CONTEXT *ContextRecord, - void *DispatcherContext); -#endif /* HAVE_NO_SEH */ +/* + * Unlike Borland and Microsoft, we don't register exception handlers by + * pushing registration records onto the runtime stack. Instead, we register + * them by creating an EXCEPTION_REGISTRATION within the activation record. + */ -#ifdef HAVE_NO_SEH +typedef struct EXCEPTION_REGISTRATION { + struct EXCEPTION_REGISTRATION *link; + EXCEPTION_DISPOSITION (*handler)( + struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*); + void *ebp; + void *esp; + int status; +} EXCEPTION_REGISTRATION; /* Need to add noinline flag to DllMain declaration so that gcc -O3 * does not inline asm code into DllEntryPoint and cause a @@ -109,6 +103,10 @@ DllMain(hInstance, reason, reserved) DWORD reason; LPVOID reserved; { +#ifdef HAVE_NO_SEH + EXCEPTION_REGISTRATION registration; +#endif + /* * If we are attaching to the DLL from a new process, tell Tk about * the hInstance to use. @@ -128,26 +126,78 @@ DllMain(hInstance, reason, reserved) */ #ifdef HAVE_NO_SEH -# ifdef TCL_MEM_DEBUG - __asm__ __volatile__ ( - "movl %%esp, %0" "\n\t" - "movl %%ebp, %1" "\n\t" - "movl %%fs:0, %2" "\n\t" - : "=m"(INITIAL_ESP), - "=m"(INITIAL_EBP), - "=r"(INITIAL_HANDLER) ); -# endif /* TCL_MEM_DEBUG */ - - __asm__ __volatile__ ( - "pushl %%ebp" "\n\t" - "pushl %0" "\n\t" - "pushl %%fs:0" "\n\t" - "movl %%esp, %%fs:0" - : - : "r" (_except_dllmain_detach_handler) ); -#else + __asm__ __volatile__ ( + + /* + * Construct an EXCEPTION_REGISTRATION to protect the call to + * TkFinalize + */ + + "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 EXCEPTION_REGISTRATION on the chain + */ + + "movl %%edx, %%fs:0" "\n\t" + + /* + * Call TkFinalize + */ + + "movl $0x0, 0x0(%%esp)" "\n\t" + "call _TkFinalize" "\n\t" + + /* + * Come here on a normal exit. Recover the EXCEPTION_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 EXCEPTION_REGISTRATION that + * we previously put on the chain. + */ + + "1:" "\t" + "movl %%fs:0, %%edx" "\n\t" + "movl 0x8(%%edx), %%edx" "\n" + + + /* + * Come here however we exited. Restore context from the + * EXCEPTION_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 */ + : + [registration] "m" (registration), + [ok] "i" (TCL_OK), + [error] "i" (TCL_ERROR) + : + "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory" + ); + +#else /* HAVE_NO_SEH */ __try { -#endif /* HAVE_NO_SEH */ /* * Run and remove our exit handlers, if they haven't already * been run. Just in case we are being unloaded prior to @@ -156,76 +206,14 @@ DllMain(hInstance, reason, reserved) */ TkFinalize(NULL); - -#ifdef HAVE_NO_SEH - __asm__ __volatile__ ( - "jmp dllmain_detach_pop" "\n" - "dllmain_detach_reentry:" "\n\t" - "movl %%fs:0, %%eax" "\n\t" - "movl 0x8(%%eax), %%esp" "\n\t" - "movl 0x8(%%esp), %%ebp" "\n" - "dllmain_detach_pop:" "\n\t" - "movl (%%esp), %%eax" "\n\t" - "movl %%eax, %%fs:0" "\n\t" - "add $12, %%esp" "\n\t" - : - : - : "%eax"); - -# ifdef TCL_MEM_DEBUG - __asm__ __volatile__ ( - "movl %%esp, %0" "\n\t" - "movl %%ebp, %1" "\n\t" - "movl %%fs:0, %2" "\n\t" - : "=m"(RESTORED_ESP), - "=m"(RESTORED_EBP), - "=r"(RESTORED_HANDLER) ); - - if (INITIAL_ESP != RESTORED_ESP) - Tcl_Panic("ESP restored incorrectly"); - if (INITIAL_EBP != RESTORED_EBP) - Tcl_Panic("EBP restored incorrectly"); - if (INITIAL_HANDLER != RESTORED_HANDLER) - Tcl_Panic("HANDLER restored incorrectly"); -# endif /* TCL_MEM_DEBUG */ -#else } __except (EXCEPTION_EXECUTE_HANDLER) { - /* empty handler body */ + /* empty handler body. */ } -#endif /* HAVE_NO_SEH */ +#endif + break; } return TRUE; } -/* - *---------------------------------------------------------------------- - * - * _except_dllmain_detach_handler -- - * - * SEH exception handler for DllMain. - * - * Results: - * See DllMain. - * - * Side effects: - * See DllMain. - * - *---------------------------------------------------------------------- - */ -#ifdef HAVE_NO_SEH -static -__attribute__ ((cdecl)) -EXCEPTION_DISPOSITION -_except_dllmain_detach_handler( - struct _EXCEPTION_RECORD *ExceptionRecord, - void *EstablisherFrame, - struct _CONTEXT *ContextRecord, - void *DispatcherContext) -{ - __asm__ __volatile__ ( - "jmp dllmain_detach_reentry"); - return 0; /* Function does not return */ -} -#endif /* HAVE_NO_SEH */ #endif /* !STATIC_BUILD */ |