/**************************************************************************** * * * GNAT COMPILER COMPONENTS * * * * S E H - I N I T * * * * C Implementation File * * * * Copyright (C) 2005, Free Software Foundation, Inc. * * * * GNAT is free software; you can redistribute it and/or modify it under * * terms of the GNU General Public License as published by the Free Soft- * * ware Foundation; either version 2, or (at your option) any later ver- * * sion. GNAT is distributed in the hope that it will be useful, but WITH- * * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * * for more details. You should have received a copy of the GNU General * * Public License distributed with GNAT; see file COPYING. If not, write * * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, * * Boston, MA 02110-1301, USA. * * * * As a special exception, if you link this file with other files to * * produce an executable, this file does not by itself cause the resulting * * executable to be covered by the GNU General Public License. This except- * * ion does not however invalidate any other reasons why the executable * * file might be covered by the GNU Public License. * * * * GNAT was originally developed by the GNAT team at New York University. * * Extensive contributions were provided by Ada Core Technologies Inc. * * * ****************************************************************************/ /* This unit contains support for SEH (Structured Exception Handling). Right now the only implementation is for Win32. */ #ifdef IN_RTS #include "tconfig.h" #include "tsystem.h" /* We don't have libiberty, so us malloc. */ #define xmalloc(S) malloc (S) #else #include "config.h" #include "system.h" #endif #include "raise.h" /* Addresses of exception data blocks for predefined exceptions. */ extern struct Exception_Data constraint_error; extern struct Exception_Data numeric_error; extern struct Exception_Data program_error; extern struct Exception_Data storage_error; extern struct Exception_Data tasking_error; extern struct Exception_Data _abort_signal; #define Raise_From_Signal_Handler \ ada__exceptions__raise_from_signal_handler extern void Raise_From_Signal_Handler (struct Exception_Data *, const char *); #ifdef _WIN32 #include #include extern void _global_unwind2 (void *); EXCEPTION_DISPOSITION __gnat_SEH_error_handler (struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*); EXCEPTION_DISPOSITION __gnat_SEH_error_handler (struct _EXCEPTION_RECORD* ExceptionRecord, void *EstablisherFrame, struct _CONTEXT* ContextRecord ATTRIBUTE_UNUSED, void *DispatcherContext ATTRIBUTE_UNUSED) { struct Exception_Data *exception; const char *msg; switch (ExceptionRecord->ExceptionCode) { case EXCEPTION_ACCESS_VIOLATION: /* If the failing address isn't maximally-aligned or if the page before the faulting page is not accessible, this is a program error. */ if ((ExceptionRecord->ExceptionInformation[1] & 3) != 0 || IsBadCodePtr ((void *)(ExceptionRecord->ExceptionInformation[1] + 4096))) { exception = &program_error; msg = "EXCEPTION_ACCESS_VIOLATION"; } else { /* otherwise it is a stack overflow */ exception = &storage_error; msg = "stack overflow (or erroneous memory access)"; } break; case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: exception = &constraint_error; msg = "EXCEPTION_ARRAY_BOUNDS_EXCEEDED"; break; case EXCEPTION_DATATYPE_MISALIGNMENT: exception = &constraint_error; msg = "EXCEPTION_DATATYPE_MISALIGNMENT"; break; case EXCEPTION_FLT_DENORMAL_OPERAND: exception = &constraint_error; msg = "EXCEPTION_FLT_DENORMAL_OPERAND"; break; case EXCEPTION_FLT_DIVIDE_BY_ZERO: exception = &constraint_error; msg = "EXCEPTION_FLT_DENORMAL_OPERAND"; break; case EXCEPTION_FLT_INVALID_OPERATION: exception = &constraint_error; msg = "EXCEPTION_FLT_INVALID_OPERATION"; break; case EXCEPTION_FLT_OVERFLOW: exception = &constraint_error; msg = "EXCEPTION_FLT_OVERFLOW"; break; case EXCEPTION_FLT_STACK_CHECK: exception = &program_error; msg = "EXCEPTION_FLT_STACK_CHECK"; break; case EXCEPTION_FLT_UNDERFLOW: exception = &constraint_error; msg = "EXCEPTION_FLT_UNDERFLOW"; break; case EXCEPTION_INT_DIVIDE_BY_ZERO: exception = &constraint_error; msg = "EXCEPTION_INT_DIVIDE_BY_ZERO"; break; case EXCEPTION_INT_OVERFLOW: exception = &constraint_error; msg = "EXCEPTION_INT_OVERFLOW"; break; case EXCEPTION_INVALID_DISPOSITION: exception = &program_error; msg = "EXCEPTION_INVALID_DISPOSITION"; break; case EXCEPTION_NONCONTINUABLE_EXCEPTION: exception = &program_error; msg = "EXCEPTION_NONCONTINUABLE_EXCEPTION"; break; case EXCEPTION_PRIV_INSTRUCTION: exception = &program_error; msg = "EXCEPTION_PRIV_INSTRUCTION"; break; case EXCEPTION_SINGLE_STEP: exception = &program_error; msg = "EXCEPTION_SINGLE_STEP"; break; case EXCEPTION_STACK_OVERFLOW: exception = &storage_error; msg = "EXCEPTION_STACK_OVERFLOW"; break; default: exception = &program_error; msg = "unhandled signal"; } /* This call is important as it avoids locking the second time we catch a signal. Note that this routine is documented as internal to Windows and should not be used. */ _global_unwind2 (EstablisherFrame); /* Call equivalent to RtlUnwind (EstablisherFrame, NULL, NULL, 0); */ Raise_From_Signal_Handler (exception, msg); return 0; /* This is never reached, avoid compiler warning */ } /* Install the Win32 SEH exception handler. Note that the caller must have allocated 8 bytes on the stack and pass the pointer to this stack space. This is needed as the SEH exception handler must be on the stack of the thread. int buf[2]; __gnat_install_SEH_handler ((void*)buf); main(); This call must be done before calling the main procedure or the thread entry. The stack space must exists during all the main run. */ void __gnat_install_SEH_handler (void *ER) { int *ptr; /* put current handler in ptr */ asm ("mov %%fs:(0),%%ecx" : : : "%ecx"); asm ("mov %%ecx,%0" : "=m" (ptr)); ((int *)ER)[0] = (int)ptr; /* previous handler */ ((int *)ER)[1] = (int)__gnat_SEH_error_handler; /* new handler */ /* ptr is the new handler, set fs:(0) with this value */ ptr = (int *)ER; asm ("mov %0,%%ecx" : : "m" (ptr) : "%ecx"); asm ("mov %ecx,%fs:(0)"); } #else /* _WIN32 */ /* For all non Windows targets we provide a dummy SEH install handler. */ void __gnat_install_SEH_handler (void *eh ATTRIBUTE_UNUSED) { } #endif