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Diffstat (limited to 'gcc-4.3.1/gcc/ada/seh_init.c')
| -rw-r--r-- | gcc-4.3.1/gcc/ada/seh_init.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/gcc-4.3.1/gcc/ada/seh_init.c b/gcc-4.3.1/gcc/ada/seh_init.c new file mode 100644 index 000000000..7b2f093fe --- /dev/null +++ b/gcc-4.3.1/gcc/ada/seh_init.c @@ -0,0 +1,233 @@ +/**************************************************************************** + * * + * 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 <windows.h> +#include <excpt.h> + +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 |