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309 lines
10 KiB
C
309 lines
10 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) 2005-2019, 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 3, 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. *
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* *
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* As a special exception under Section 7 of GPL version 3, you are granted *
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* additional permissions described in the GCC Runtime Library Exception, *
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* version 3.1, as published by the Free Software Foundation. *
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* *
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* You should have received a copy of the GNU General Public License and *
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* a copy of the GCC Runtime Library Exception along with this program; *
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
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* <http://www.gnu.org/licenses/>. *
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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 and Cygwin. */
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#if defined (_WIN32) || (defined (__CYGWIN__) && defined (__SEH__))
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/* Include system headers, before system.h poisons malloc. */
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#include <windows.h>
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#include <excpt.h>
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#endif
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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 use 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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#ifdef __cplusplus
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extern "C" {
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#endif
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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 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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ATTRIBUTE_NORETURN;
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#if defined (_WIN32) || (defined (__CYGWIN__) && defined (__SEH__))
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/* Prototypes. */
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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*) ATTRIBUTE_NORETURN;
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struct Exception_Data *
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__gnat_map_SEH (EXCEPTION_RECORD* ExceptionRecord, const char **msg);
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/* Convert an SEH exception to an Ada one. Return the exception ID and set
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MSG to the corresponding message. */
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struct Exception_Data *
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__gnat_map_SEH (EXCEPTION_RECORD* ExceptionRecord, const char **msg)
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{
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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 before
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the faulting page is not accessible, this is a program error. */
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if ((ExceptionRecord->ExceptionInformation[1] & 3) != 0
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|| IsBadCodePtr
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((FARPROC)(ExceptionRecord->ExceptionInformation[1] + 4096)))
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{
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*msg = "EXCEPTION_ACCESS_VIOLATION";
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return &program_error;
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}
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else
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{
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/* Otherwise this is a stack overflow. */
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*msg = "stack overflow or erroneous memory access";
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return &storage_error;
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}
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case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
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*msg = "EXCEPTION_ARRAY_BOUNDS_EXCEEDED";
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return &constraint_error;
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case EXCEPTION_DATATYPE_MISALIGNMENT:
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*msg = "EXCEPTION_DATATYPE_MISALIGNMENT";
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return &constraint_error;
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case EXCEPTION_FLT_DENORMAL_OPERAND:
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*msg = "EXCEPTION_FLT_DENORMAL_OPERAND";
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return &constraint_error;
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case EXCEPTION_FLT_DIVIDE_BY_ZERO:
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*msg = "EXCEPTION_FLT_DENORMAL_OPERAND";
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return &constraint_error;
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case EXCEPTION_FLT_INVALID_OPERATION:
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*msg = "EXCEPTION_FLT_INVALID_OPERATION";
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return &constraint_error;
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case EXCEPTION_FLT_OVERFLOW:
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*msg = "EXCEPTION_FLT_OVERFLOW";
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return &constraint_error;
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case EXCEPTION_FLT_STACK_CHECK:
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*msg = "EXCEPTION_FLT_STACK_CHECK";
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return &program_error;
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case EXCEPTION_FLT_UNDERFLOW:
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*msg = "EXCEPTION_FLT_UNDERFLOW";
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return &constraint_error;
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case EXCEPTION_INT_DIVIDE_BY_ZERO:
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*msg = "EXCEPTION_INT_DIVIDE_BY_ZERO";
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return &constraint_error;
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case EXCEPTION_INT_OVERFLOW:
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*msg = "EXCEPTION_INT_OVERFLOW";
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return &constraint_error;
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case EXCEPTION_INVALID_DISPOSITION:
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*msg = "EXCEPTION_INVALID_DISPOSITION";
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return &program_error;
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case EXCEPTION_NONCONTINUABLE_EXCEPTION:
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*msg = "EXCEPTION_NONCONTINUABLE_EXCEPTION";
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return &program_error;
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case EXCEPTION_PRIV_INSTRUCTION:
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*msg = "EXCEPTION_PRIV_INSTRUCTION";
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return &program_error;
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case EXCEPTION_SINGLE_STEP:
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*msg = "EXCEPTION_SINGLE_STEP";
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return &program_error;
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case EXCEPTION_STACK_OVERFLOW:
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*msg = "EXCEPTION_STACK_OVERFLOW";
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return &storage_error;
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default:
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*msg = NULL;
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return NULL;
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}
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}
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#if !(defined (_WIN64) && defined (__SEH__))
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/* The "fake" exception handler to be associated with the .text section. */
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EXCEPTION_DISPOSITION
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__gnat_SEH_error_handler (struct _EXCEPTION_RECORD* ExceptionRecord,
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void *EstablisherFrame ATTRIBUTE_UNUSED,
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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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exception = __gnat_map_SEH (ExceptionRecord, &msg);
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if (exception == NULL)
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{
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exception = &program_error;
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msg = "unhandled signal";
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}
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#if !defined (_WIN64)
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/* This call is important as it avoids locking the second time we catch a
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signal; it's equivalent to RtlUnwind (EstablisherFrame, NULL, NULL, 0);
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Note that this routine is documented as internal to Windows and should
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not be used. */
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_global_unwind2 (EstablisherFrame);
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#endif
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Raise_From_Signal_Handler (exception, msg);
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}
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#endif /* !(defined (_WIN64) && defined (__SEH__)) */
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#if defined (_WIN64)
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/* On x86-64/Windows the EH mechanism is no more based on a chained list of
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handlers addresses on the stack. Instead unwinding information is used
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to retrieve the exception handler (similar to DWARF2 unwinding). So in
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order to register an exception handler, we need to put in the binary
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some unwinding information. This information can be present statically
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in the image file inside the .pdata section or registered through the
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RtlAddFunctionTable API. In the case where the GCC toolchain does not
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generate the .pdata information for each function, we don't really need
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to handle SEH exceptions except for signal handling, so we register a
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"fake" unwinding data that associates a SEH exception handler with the
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complete .text section. As we never return from the handler, the system
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does not try to do the final unwinding using the .pdata information and
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the unwinding is handled by the runtime using the GNAT or GCC mechanism.
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Solutions based on SetUnhandledExceptionFilter have been discarded as this
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function is mostly disabled on latest Windows versions.
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Using AddVectoredExceptionHandler should also be discarded as it overrides
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all SEH exception handlers that might be present in the program itself and
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the loaded DLL; for example it results in unexpected behavior in the Win32
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subsystem. */
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#ifndef __SEH__
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/* Do not use this trick when GCC generates the .pdata information, since it
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is not necessary and will conflict with the per-function data. */
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asm
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(
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" .section .rdata, \"dr\"\n"
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" .align 4\n"
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"unwind_info:\n"
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" .byte 9\n" /* UNW_FLAG_EHANDLER | UNW_VERSION */
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" .byte 0\n" /* Prologue size. */
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" .byte 0\n" /* Count of unwind code. */
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" .byte 0\n" /* Frame register and offset. */
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" .rva __gnat_SEH_error_handler\n"
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"\n"
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" .section .pdata, \"dr\"\n"
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" .align 4\n"
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" .long 0\n" /* ImageBase */
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" .rva etext\n"
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" .rva unwind_info\n"
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"\n"
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" .text\n"
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);
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#endif /* __SEH__ */
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/* Nothing to do, the handler is either not used or statically installed by
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the asm statement just above. */
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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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#else /* defined (_WIN64) */
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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 space.
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This is needed as the SEH exception handler must be on the stack of the
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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 exist during the entire 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),%0" : "=r" (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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/* ER is the new handler, set fs:(0) to this value. */
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asm volatile ("mov %0,%%fs:(0)": : "r" (ER));
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}
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#endif
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#else /* defined (_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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#ifdef __cplusplus
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}
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#endif
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