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