2542 lines
72 KiB
C
2542 lines
72 KiB
C
/****************************************************************************
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* *
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* GNAT COMPILER COMPONENTS *
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* *
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* 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) 1992-2012, 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 initialization circuits that are system dependent.
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A major part of the functionality involves stack overflow checking.
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The GCC backend generates probe instructions to test for stack overflow.
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For details on the exact approach used to generate these probes, see the
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"Using and Porting GCC" manual, in particular the "Stack Checking" section
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and the subsection "Specifying How Stack Checking is Done". The handlers
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installed by this file are used to catch the resulting signals that come
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from these probes failing (i.e. touching protected pages). */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This file should be kept synchronized with 2sinit.ads, 2sinit.adb,
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s-init-ae653-cert.adb and s-init-xi-sparc.adb. All these files implement
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the required functionality for different targets. */
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/* The following include is here to meet the published VxWorks requirement
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that the __vxworks header appear before any other include. */
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#ifdef __vxworks
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#include "vxWorks.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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#include <sys/stat.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 "adaint.h"
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#include "raise.h"
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extern void __gnat_raise_program_error (const char *, int);
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/* Addresses of exception data blocks for predefined exceptions. Tasking_Error
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is not used in this unit, and the abort signal is only used on IRIX. */
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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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/* For the Cert run time we use the regular raise exception routine because
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Raise_From_Signal_Handler is not available. */
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#ifdef CERT
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#define Raise_From_Signal_Handler \
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__gnat_raise_exception
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extern void Raise_From_Signal_Handler (struct Exception_Data *, const char *);
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#else
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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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#endif
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/* Global values computed by the binder. */
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int __gl_main_priority = -1;
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int __gl_main_cpu = -1;
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int __gl_time_slice_val = -1;
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char __gl_wc_encoding = 'n';
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char __gl_locking_policy = ' ';
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char __gl_queuing_policy = ' ';
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char __gl_task_dispatching_policy = ' ';
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char *__gl_priority_specific_dispatching = 0;
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int __gl_num_specific_dispatching = 0;
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char *__gl_interrupt_states = 0;
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int __gl_num_interrupt_states = 0;
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int __gl_unreserve_all_interrupts = 0;
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int __gl_exception_tracebacks = 0;
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int __gl_zero_cost_exceptions = 0;
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int __gl_detect_blocking = 0;
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int __gl_default_stack_size = -1;
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int __gl_leap_seconds_support = 0;
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int __gl_canonical_streams = 0;
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/* Indication of whether synchronous signal handler has already been
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installed by a previous call to adainit. */
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int __gnat_handler_installed = 0;
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#ifndef IN_RTS
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int __gnat_inside_elab_final_code = 0;
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/* ??? This variable is obsolete since 2001-08-29 but is kept to allow
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bootstrap from old GNAT versions (< 3.15). */
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#endif
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/* HAVE_GNAT_INIT_FLOAT must be set on every targets where a __gnat_init_float
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is defined. If this is not set then a void implementation will be defined
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at the end of this unit. */
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#undef HAVE_GNAT_INIT_FLOAT
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/******************************/
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/* __gnat_get_interrupt_state */
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/******************************/
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char __gnat_get_interrupt_state (int);
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/* This routine is called from the runtime as needed to determine the state
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of an interrupt, as set by an Interrupt_State pragma appearing anywhere
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in the current partition. The input argument is the interrupt number,
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and the result is one of the following:
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'n' this interrupt not set by any Interrupt_State pragma
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'u' Interrupt_State pragma set state to User
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'r' Interrupt_State pragma set state to Runtime
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's' Interrupt_State pragma set state to System */
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char
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__gnat_get_interrupt_state (int intrup)
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{
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if (intrup >= __gl_num_interrupt_states)
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return 'n';
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else
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return __gl_interrupt_states [intrup];
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}
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/***********************************/
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/* __gnat_get_specific_dispatching */
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/***********************************/
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char __gnat_get_specific_dispatching (int);
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/* This routine is called from the runtime as needed to determine the
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priority specific dispatching policy, as set by a
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Priority_Specific_Dispatching pragma appearing anywhere in the current
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partition. The input argument is the priority number, and the result
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is the upper case first character of the policy name, e.g. 'F' for
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FIFO_Within_Priorities. A space ' ' is returned if no
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Priority_Specific_Dispatching pragma is used in the partition. */
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char
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__gnat_get_specific_dispatching (int priority)
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{
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if (__gl_num_specific_dispatching == 0)
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return ' ';
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else if (priority >= __gl_num_specific_dispatching)
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return 'F';
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else
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return __gl_priority_specific_dispatching [priority];
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}
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#ifndef IN_RTS
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/**********************/
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/* __gnat_set_globals */
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/**********************/
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/* This routine is kept for bootstrapping purposes, since the binder generated
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file now sets the __gl_* variables directly. */
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void
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__gnat_set_globals (void)
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{
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}
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#endif
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/***************/
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/* AIX Section */
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/***************/
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#if defined (_AIX)
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#include <signal.h>
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#include <sys/time.h>
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/* Some versions of AIX don't define SA_NODEFER. */
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#ifndef SA_NODEFER
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#define SA_NODEFER 0
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#endif /* SA_NODEFER */
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/* Versions of AIX before 4.3 don't have nanosleep but provide
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nsleep instead. */
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#ifndef _AIXVERSION_430
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extern int nanosleep (struct timestruc_t *, struct timestruc_t *);
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int
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nanosleep (struct timestruc_t *Rqtp, struct timestruc_t *Rmtp)
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{
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return nsleep (Rqtp, Rmtp);
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}
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#endif /* _AIXVERSION_430 */
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/* Version of AIX before 5.3 don't have pthread_condattr_setclock:
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* supply it as a weak symbol here so that if linking on a 5.3 or newer
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* machine, we get the real one.
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*/
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#ifndef _AIXVERSION_530
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#pragma weak pthread_condattr_setclock
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int
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pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t cl) {
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return 0;
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}
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#endif
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static void
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__gnat_error_handler (int sig,
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siginfo_t *si ATTRIBUTE_UNUSED,
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void *ucontext 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 (sig)
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{
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case SIGSEGV:
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/* FIXME: we need to detect the case of a *real* SIGSEGV. */
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exception = &storage_error;
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msg = "stack overflow or erroneous memory access";
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break;
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case SIGBUS:
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exception = &constraint_error;
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msg = "SIGBUS";
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break;
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case SIGFPE:
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exception = &constraint_error;
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msg = "SIGFPE";
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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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Raise_From_Signal_Handler (exception, msg);
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}
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void
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__gnat_install_handler (void)
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{
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struct sigaction act;
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/* Set up signal handler to map synchronous signals to appropriate
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exceptions. Make sure that the handler isn't interrupted by another
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signal that might cause a scheduling event! */
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act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
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act.sa_sigaction = __gnat_error_handler;
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sigemptyset (&act.sa_mask);
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/* Do not install handlers if interrupt state is "System". */
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if (__gnat_get_interrupt_state (SIGABRT) != 's')
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sigaction (SIGABRT, &act, NULL);
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if (__gnat_get_interrupt_state (SIGFPE) != 's')
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sigaction (SIGFPE, &act, NULL);
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if (__gnat_get_interrupt_state (SIGILL) != 's')
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sigaction (SIGILL, &act, NULL);
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if (__gnat_get_interrupt_state (SIGSEGV) != 's')
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sigaction (SIGSEGV, &act, NULL);
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if (__gnat_get_interrupt_state (SIGBUS) != 's')
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sigaction (SIGBUS, &act, NULL);
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__gnat_handler_installed = 1;
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}
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/*****************/
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/* Tru64 section */
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/*****************/
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#elif defined(__alpha__) && defined(__osf__)
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#include <signal.h>
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#include <sys/siginfo.h>
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extern char *__gnat_get_code_loc (struct sigcontext *);
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extern void __gnat_set_code_loc (struct sigcontext *, char *);
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extern size_t __gnat_machine_state_length (void);
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#define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
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void
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__gnat_adjust_context_for_raise (int signo, void *ucontext)
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{
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struct sigcontext *sigcontext = (struct sigcontext *) ucontext;
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/* The unwinder expects the signal context to contain the address of the
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faulting instruction. For SIGFPE, this depends on the trap shadow
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situation (see man ieee). We nonetheless always compensate for it,
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considering that PC designates the instruction following the one that
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trapped. This is not necessarily true but corresponds to what we have
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always observed. */
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if (signo == SIGFPE)
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sigcontext->sc_pc--;
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}
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static void
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__gnat_error_handler (int sig, siginfo_t *si, void *ucontext)
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{
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struct Exception_Data *exception;
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static int recurse = 0;
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const char *msg;
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/* Adjusting is required for every fault context, so adjust for this one
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now, before we possibly trigger a recursive fault below. */
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__gnat_adjust_context_for_raise (sig, ucontext);
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/* If this was an explicit signal from a "kill", just resignal it. */
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if (SI_FROMUSER (si))
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{
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signal (sig, SIG_DFL);
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kill (getpid(), sig);
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}
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/* Otherwise, treat it as something we handle. */
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switch (sig)
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{
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case SIGSEGV:
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/* If the problem was permissions, this is a constraint error.
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Likewise if the failing address isn't maximally aligned or if
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we've recursed.
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??? Using a static variable here isn't task-safe, but it's
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much too hard to do anything else and we're just determining
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which exception to raise. */
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if (si->si_code == SEGV_ACCERR
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|| (long) si->si_addr == 0
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|| (((long) si->si_addr) & 3) != 0
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|| recurse)
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{
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exception = &constraint_error;
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msg = "SIGSEGV";
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}
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else
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{
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/* See if the page before the faulting page is accessible. Do that
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by trying to access it. We'd like to simply try to access
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4096 + the faulting address, but it's not guaranteed to be
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the actual address, just to be on the same page. */
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recurse++;
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((volatile char *)
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((long) si->si_addr & - getpagesize ()))[getpagesize ()];
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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 SIGBUS:
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exception = &program_error;
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msg = "SIGBUS";
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break;
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case SIGFPE:
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exception = &constraint_error;
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msg = "SIGFPE";
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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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recurse = 0;
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Raise_From_Signal_Handler (exception, CONST_CAST (char *, msg));
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}
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void
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__gnat_install_handler (void)
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{
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struct sigaction act;
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/* Setup signal handler to map synchronous signals to appropriate
|
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exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! */
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act.sa_handler = (void (*) (int)) __gnat_error_handler;
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act.sa_flags = SA_RESTART | SA_NODEFER | SA_SIGINFO;
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sigemptyset (&act.sa_mask);
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/* Do not install handlers if interrupt state is "System". */
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if (__gnat_get_interrupt_state (SIGABRT) != 's')
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sigaction (SIGABRT, &act, NULL);
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if (__gnat_get_interrupt_state (SIGFPE) != 's')
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sigaction (SIGFPE, &act, NULL);
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if (__gnat_get_interrupt_state (SIGILL) != 's')
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sigaction (SIGILL, &act, NULL);
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if (__gnat_get_interrupt_state (SIGSEGV) != 's')
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sigaction (SIGSEGV, &act, NULL);
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if (__gnat_get_interrupt_state (SIGBUS) != 's')
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sigaction (SIGBUS, &act, NULL);
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__gnat_handler_installed = 1;
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}
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|
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/* Routines called by s-mastop-tru64.adb. */
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#define SC_GP 29
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char *
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__gnat_get_code_loc (struct sigcontext *context)
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{
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return (char *) context->sc_pc;
|
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}
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|
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void
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__gnat_set_code_loc (struct sigcontext *context, char *pc)
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{
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context->sc_pc = (long) pc;
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}
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|
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size_t
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__gnat_machine_state_length (void)
|
|
{
|
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return sizeof (struct sigcontext);
|
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}
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|
|
/*****************/
|
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/* HP-UX section */
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/*****************/
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|
|
#elif defined (__hpux__)
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|
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#include <signal.h>
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#include <sys/ucontext.h>
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|
|
|
static void
|
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__gnat_error_handler (int sig,
|
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siginfo_t *si ATTRIBUTE_UNUSED,
|
|
void *ucontext ATTRIBUTE_UNUSED)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGSEGV:
|
|
/* FIXME: we need to detect the case of a *real* SIGSEGV. */
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
break;
|
|
|
|
case SIGBUS:
|
|
exception = &constraint_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
|
|
#if defined (__hppa__)
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|
char __gnat_alternate_stack[16 * 1024]; /* 2 * SIGSTKSZ */
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|
#else
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|
char __gnat_alternate_stack[128 * 1024]; /* MINSIGSTKSZ */
|
|
#endif
|
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|
|
void
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__gnat_install_handler (void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* Set up signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! Also setup an alternate
|
|
stack region for the handler execution so that stack overflows can be
|
|
handled properly, avoiding a SEGV generation from stack usage by the
|
|
handler itself. */
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|
|
stack_t stack;
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stack.ss_sp = __gnat_alternate_stack;
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|
stack.ss_size = sizeof (__gnat_alternate_stack);
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stack.ss_flags = 0;
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|
sigaltstack (&stack, NULL);
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|
|
|
act.sa_sigaction = __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
sigaction (SIGABRT, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
act.sa_flags |= SA_ONSTACK;
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/*********************/
|
|
/* GNU/Linux Section */
|
|
/*********************/
|
|
|
|
#elif defined (linux)
|
|
|
|
#include <signal.h>
|
|
|
|
#define __USE_GNU 1 /* required to get REG_EIP/RIP from glibc's ucontext.h */
|
|
#include <sys/ucontext.h>
|
|
|
|
/* GNU/Linux, which uses glibc, does not define NULL in included
|
|
header files. */
|
|
|
|
#if !defined (NULL)
|
|
#define NULL ((void *) 0)
|
|
#endif
|
|
|
|
#if defined (MaRTE)
|
|
|
|
/* MaRTE OS provides its own version of sigaction, sigfillset, and
|
|
sigemptyset (overriding these symbol names). We want to make sure that
|
|
the versions provided by the underlying C library are used here (these
|
|
versions are renamed by MaRTE to linux_sigaction, fake_linux_sigfillset,
|
|
and fake_linux_sigemptyset, respectively). The MaRTE library will not
|
|
always be present (it will not be linked if no tasking constructs are
|
|
used), so we use the weak symbol mechanism to point always to the symbols
|
|
defined within the C library. */
|
|
|
|
#pragma weak linux_sigaction
|
|
int linux_sigaction (int signum, const struct sigaction *act,
|
|
struct sigaction *oldact) {
|
|
return sigaction (signum, act, oldact);
|
|
}
|
|
#define sigaction(signum, act, oldact) linux_sigaction (signum, act, oldact)
|
|
|
|
#pragma weak fake_linux_sigfillset
|
|
void fake_linux_sigfillset (sigset_t *set) {
|
|
sigfillset (set);
|
|
}
|
|
#define sigfillset(set) fake_linux_sigfillset (set)
|
|
|
|
#pragma weak fake_linux_sigemptyset
|
|
void fake_linux_sigemptyset (sigset_t *set) {
|
|
sigemptyset (set);
|
|
}
|
|
#define sigemptyset(set) fake_linux_sigemptyset (set)
|
|
|
|
#endif
|
|
|
|
#if defined (i386) || defined (__x86_64__) || defined (__ia64__)
|
|
|
|
#define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
|
void
|
|
__gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
{
|
|
mcontext_t *mcontext = &((ucontext_t *) ucontext)->uc_mcontext;
|
|
|
|
/* On the i386 and x86-64 architectures, stack checking is performed by
|
|
means of probes with moving stack pointer, that is to say the probed
|
|
address is always the value of the stack pointer. Upon hitting the
|
|
guard page, the stack pointer therefore points to an inaccessible
|
|
address and an alternate signal stack is needed to run the handler.
|
|
But there is an additional twist: on these architectures, the EH
|
|
return code writes the address of the handler at the target CFA's
|
|
value on the stack before doing the jump. As a consequence, if
|
|
there is an active handler in the frame whose stack has overflowed,
|
|
the stack pointer must nevertheless point to an accessible address
|
|
by the time the EH return is executed.
|
|
|
|
We therefore adjust the saved value of the stack pointer by the size
|
|
of one page + a small dope of 4 words, in order to make sure that it
|
|
points to an accessible address in case it's used as the target CFA.
|
|
The stack checking code guarantees that this address is unused by the
|
|
time this happens. */
|
|
|
|
#if defined (i386)
|
|
unsigned long *pc = (unsigned long *)mcontext->gregs[REG_EIP];
|
|
/* The pattern is "orl $0x0,(%esp)" for a probe in 32-bit mode. */
|
|
if (signo == SIGSEGV && pc && *pc == 0x00240c83)
|
|
mcontext->gregs[REG_ESP] += 4096 + 4 * sizeof (unsigned long);
|
|
#elif defined (__x86_64__)
|
|
unsigned long *pc = (unsigned long *)mcontext->gregs[REG_RIP];
|
|
/* The pattern is "orq $0x0,(%rsp)" for a probe in 64-bit mode. */
|
|
if (signo == SIGSEGV && pc && (*pc & 0xffffffffff) == 0x00240c8348)
|
|
mcontext->gregs[REG_RSP] += 4096 + 4 * sizeof (unsigned long);
|
|
#elif defined (__ia64__)
|
|
/* ??? The IA-64 unwinder doesn't compensate for signals. */
|
|
mcontext->sc_ip++;
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|
|
static void
|
|
__gnat_error_handler (int sig, siginfo_t *si ATTRIBUTE_UNUSED, void *ucontext)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
/* Adjusting is required for every fault context, so adjust for this one
|
|
now, before we possibly trigger a recursive fault below. */
|
|
__gnat_adjust_context_for_raise (sig, ucontext);
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGSEGV:
|
|
/* Here we would like a discrimination test to see whether the page
|
|
before the faulting address is accessible. Unfortunately, Linux
|
|
seems to have no way of giving us the faulting address.
|
|
|
|
In old versions of init.c, we had a test of the page before the
|
|
stack pointer:
|
|
|
|
((volatile char *)
|
|
((long) si->esp_at_signal & - getpagesize ()))[getpagesize ()];
|
|
|
|
but that's wrong since it tests the stack pointer location and the
|
|
stack probing code may not move it until all probes succeed.
|
|
|
|
For now we simply do not attempt any discrimination at all. Note
|
|
that this is quite acceptable, since a "real" SIGSEGV can only
|
|
occur as the result of an erroneous program. */
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
break;
|
|
|
|
case SIGBUS:
|
|
exception = &storage_error;
|
|
msg = "SIGBUS: possible stack overflow";
|
|
break;
|
|
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
|
|
/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
|
|
char __gnat_alternate_stack[16 * 1024]; /* 2 * SIGSTKSZ */
|
|
#endif
|
|
|
|
#ifdef __XENO__
|
|
#include <sys/mman.h>
|
|
#include <native/task.h>
|
|
|
|
RT_TASK main_task;
|
|
#endif
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
#ifdef __XENO__
|
|
int prio;
|
|
|
|
if (__gl_main_priority == -1)
|
|
prio = 49;
|
|
else
|
|
prio = __gl_main_priority;
|
|
|
|
/* Avoid memory swapping for this program */
|
|
|
|
mlockall (MCL_CURRENT|MCL_FUTURE);
|
|
|
|
/* Turn the current Linux task into a native Xenomai task */
|
|
|
|
rt_task_shadow(&main_task, "environment_task", prio, T_FPU);
|
|
#endif
|
|
|
|
/* Set up signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! Also setup an alternate
|
|
stack region for the handler execution so that stack overflows can be
|
|
handled properly, avoiding a SEGV generation from stack usage by the
|
|
handler itself. */
|
|
|
|
#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
|
|
stack_t stack;
|
|
stack.ss_sp = __gnat_alternate_stack;
|
|
stack.ss_size = sizeof (__gnat_alternate_stack);
|
|
stack.ss_flags = 0;
|
|
sigaltstack (&stack, NULL);
|
|
#endif
|
|
|
|
act.sa_sigaction = __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
sigaction (SIGABRT, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
|
|
act.sa_flags |= SA_ONSTACK;
|
|
#endif
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/****************/
|
|
/* IRIX Section */
|
|
/****************/
|
|
|
|
#elif defined (sgi)
|
|
|
|
#include <signal.h>
|
|
#include <siginfo.h>
|
|
|
|
#ifndef NULL
|
|
#define NULL 0
|
|
#endif
|
|
|
|
#define SIGADAABORT 48
|
|
#define SIGNAL_STACK_SIZE 4096
|
|
#define SIGNAL_STACK_ALIGNMENT 64
|
|
|
|
#define Check_Abort_Status \
|
|
system__soft_links__check_abort_status
|
|
extern int (*Check_Abort_Status) (void);
|
|
|
|
extern struct Exception_Data _abort_signal;
|
|
|
|
/* We are not setting the SA_SIGINFO bit in the sigaction flags when
|
|
connecting that handler, with the effects described in the sigaction
|
|
man page:
|
|
|
|
SA_SIGINFO If set and the signal is caught, sig is passed as the
|
|
first argument to the signal-catching function. If the
|
|
second argument is not equal to NULL, it points to a
|
|
siginfo_t structure containing the reason why the
|
|
signal was generated [see siginfo(5)]; the third
|
|
argument points to a ucontext_t structure containing
|
|
the receiving process's context when the signal was
|
|
delivered [see ucontext(5)]. If cleared and the signal
|
|
is caught, the first argument is also the signal number
|
|
but the second argument is the signal code identifying
|
|
the cause of the signal. The third argument points to a
|
|
sigcontext_t structure containing the receiving
|
|
process's context when the signal was delivered. This
|
|
is the default behavior (see signal(5) for more
|
|
details). Additionally, when SA_SIGINFO is set for a
|
|
signal, multiple occurrences of that signal will be
|
|
queued for delivery in FIFO order (see sigqueue(3) for
|
|
a more detailed explanation of this concept), if those
|
|
occurrences of that signal were generated using
|
|
sigqueue(3). */
|
|
|
|
static void
|
|
__gnat_error_handler (int sig, siginfo_t *reason, void *uc ATTRIBUTE_UNUSED)
|
|
{
|
|
/* This handler is installed with SA_SIGINFO cleared, but there's no
|
|
prototype for the resulting alternative three-argument form, so we
|
|
have to hack around this by casting reason to the int actually
|
|
passed. */
|
|
int code = (int) reason;
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGSEGV:
|
|
if (code == EFAULT)
|
|
{
|
|
exception = &program_error;
|
|
msg = "SIGSEGV: (Invalid virtual address)";
|
|
}
|
|
else if (code == ENXIO)
|
|
{
|
|
exception = &program_error;
|
|
msg = "SIGSEGV: (Read beyond mapped object)";
|
|
}
|
|
else if (code == ENOSPC)
|
|
{
|
|
exception = &program_error; /* ??? storage_error ??? */
|
|
msg = "SIGSEGV: (Autogrow for file failed)";
|
|
}
|
|
else if (code == EACCES || code == EEXIST)
|
|
{
|
|
/* ??? We handle stack overflows here, some of which do trigger
|
|
SIGSEGV + EEXIST on Irix 6.5 although EEXIST is not part of
|
|
the documented valid codes for SEGV in the signal(5) man
|
|
page. */
|
|
|
|
/* ??? Re-add smarts to further verify that we launched
|
|
the stack into a guard page, not an attempt to
|
|
write to .text or something. */
|
|
exception = &storage_error;
|
|
msg = "SIGSEGV: stack overflow or erroneous memory access";
|
|
}
|
|
else
|
|
{
|
|
/* Just in case the OS guys did it to us again. Sometimes
|
|
they fail to document all of the valid codes that are
|
|
passed to signal handlers, just in case someone depends
|
|
on knowing all the codes. */
|
|
exception = &program_error;
|
|
msg = "SIGSEGV: (Undocumented reason)";
|
|
}
|
|
break;
|
|
|
|
case SIGBUS:
|
|
/* Map all bus errors to Program_Error. */
|
|
exception = &program_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
|
|
case SIGFPE:
|
|
/* Map all fpe errors to Constraint_Error. */
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
|
|
case SIGADAABORT:
|
|
if ((*Check_Abort_Status) ())
|
|
{
|
|
exception = &_abort_signal;
|
|
msg = "";
|
|
}
|
|
else
|
|
return;
|
|
|
|
break;
|
|
|
|
default:
|
|
/* Everything else is a Program_Error. */
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* Setup signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event!
|
|
|
|
The handler is installed with SA_SIGINFO cleared, but there's no
|
|
C++ prototype for the three-argument form, so fake it by using
|
|
sa_sigaction and casting the arguments instead. */
|
|
|
|
act.sa_sigaction = __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER + SA_RESTART;
|
|
sigfillset (&act.sa_mask);
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
sigaction (SIGABRT, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGADAABORT) != 's')
|
|
sigaction (SIGADAABORT, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/*******************/
|
|
/* LynxOS Section */
|
|
/*******************/
|
|
|
|
#elif defined (__Lynx__)
|
|
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
static void
|
|
__gnat_error_handler (int sig)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch(sig)
|
|
{
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
case SIGILL:
|
|
exception = &constraint_error;
|
|
msg = "SIGILL";
|
|
break;
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &constraint_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler(exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler(void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
act.sa_handler = __gnat_error_handler;
|
|
act.sa_flags = 0x0;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/*******************/
|
|
/* Solaris Section */
|
|
/*******************/
|
|
|
|
#elif defined (sun) && defined (__SVR4) && !defined (__vxworks)
|
|
|
|
#include <signal.h>
|
|
#include <siginfo.h>
|
|
#include <sys/ucontext.h>
|
|
#include <sys/regset.h>
|
|
|
|
/* The code below is common to SPARC and x86. Beware of the delay slot
|
|
differences for signal context adjustments. */
|
|
|
|
#if defined (__sparc)
|
|
#define RETURN_ADDR_OFFSET 8
|
|
#else
|
|
#define RETURN_ADDR_OFFSET 0
|
|
#endif
|
|
|
|
static void
|
|
__gnat_error_handler (int sig, siginfo_t *si, void *ucontext ATTRIBUTE_UNUSED)
|
|
{
|
|
struct Exception_Data *exception;
|
|
static int recurse = 0;
|
|
const char *msg;
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGSEGV:
|
|
/* If the problem was permissions, this is a constraint error.
|
|
Likewise if the failing address isn't maximally aligned or if
|
|
we've recursed.
|
|
|
|
??? Using a static variable here isn't task-safe, but it's
|
|
much too hard to do anything else and we're just determining
|
|
which exception to raise. */
|
|
if (si->si_code == SEGV_ACCERR
|
|
|| (long) si->si_addr == 0
|
|
|| (((long) si->si_addr) & 3) != 0
|
|
|| recurse)
|
|
{
|
|
exception = &constraint_error;
|
|
msg = "SIGSEGV";
|
|
}
|
|
else
|
|
{
|
|
/* See if the page before the faulting page is accessible. Do that
|
|
by trying to access it. We'd like to simply try to access
|
|
4096 + the faulting address, but it's not guaranteed to be
|
|
the actual address, just to be on the same page. */
|
|
recurse++;
|
|
((volatile char *)
|
|
((long) si->si_addr & - getpagesize ()))[getpagesize ()];
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
}
|
|
break;
|
|
|
|
case SIGBUS:
|
|
exception = &program_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
recurse = 0;
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* Set up signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! */
|
|
|
|
act.sa_sigaction = __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
sigaction (SIGABRT, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/***************/
|
|
/* VMS Section */
|
|
/***************/
|
|
|
|
#elif defined (VMS)
|
|
|
|
/* Routine called from binder to override default feature values. */
|
|
void __gnat_set_features (void);
|
|
int __gnat_features_set = 0;
|
|
|
|
#ifdef __IA64
|
|
#define lib_get_curr_invo_context LIB$I64_GET_CURR_INVO_CONTEXT
|
|
#define lib_get_prev_invo_context LIB$I64_GET_PREV_INVO_CONTEXT
|
|
#define lib_get_invo_handle LIB$I64_GET_INVO_HANDLE
|
|
#else
|
|
#define lib_get_curr_invo_context LIB$GET_CURR_INVO_CONTEXT
|
|
#define lib_get_prev_invo_context LIB$GET_PREV_INVO_CONTEXT
|
|
#define lib_get_invo_handle LIB$GET_INVO_HANDLE
|
|
#endif
|
|
|
|
/* Define macro symbols for the VMS conditions that become Ada exceptions.
|
|
Most of these are also defined in the header file ssdef.h which has not
|
|
yet been converted to be recognized by GNU C. */
|
|
|
|
/* Defining these as macros, as opposed to external addresses, allows
|
|
them to be used in a case statement below. */
|
|
#define SS$_ACCVIO 12
|
|
#define SS$_HPARITH 1284
|
|
#define SS$_STKOVF 1364
|
|
#define SS$_RESIGNAL 2328
|
|
|
|
/* These codes are in standard message libraries. */
|
|
extern int C$_SIGKILL;
|
|
extern int SS$_DEBUG;
|
|
extern int LIB$_KEYNOTFOU;
|
|
extern int LIB$_ACTIMAGE;
|
|
#define CMA$_EXIT_THREAD 4227492
|
|
#define MTH$_FLOOVEMAT 1475268 /* Some ACVC_21 CXA tests */
|
|
#define SS$_INTDIV 1156
|
|
|
|
/* These codes are non standard, which is to say the author is
|
|
not sure if they are defined in the standard message libraries
|
|
so keep them as macros for now. */
|
|
#define RDB$_STREAM_EOF 20480426
|
|
#define FDL$_UNPRIKW 11829410
|
|
|
|
struct cond_except {
|
|
unsigned int cond;
|
|
const struct Exception_Data *except;
|
|
};
|
|
|
|
struct descriptor_s {
|
|
unsigned short len, mbz;
|
|
__char_ptr32 adr;
|
|
};
|
|
|
|
/* Conditions that don't have an Ada exception counterpart must raise
|
|
Non_Ada_Error. Since this is defined in s-auxdec, it should only be
|
|
referenced by user programs, not the compiler or tools. Hence the
|
|
#ifdef IN_RTS. */
|
|
|
|
#ifdef IN_RTS
|
|
|
|
#define Status_Error ada__io_exceptions__status_error
|
|
extern struct Exception_Data Status_Error;
|
|
|
|
#define Mode_Error ada__io_exceptions__mode_error
|
|
extern struct Exception_Data Mode_Error;
|
|
|
|
#define Name_Error ada__io_exceptions__name_error
|
|
extern struct Exception_Data Name_Error;
|
|
|
|
#define Use_Error ada__io_exceptions__use_error
|
|
extern struct Exception_Data Use_Error;
|
|
|
|
#define Device_Error ada__io_exceptions__device_error
|
|
extern struct Exception_Data Device_Error;
|
|
|
|
#define End_Error ada__io_exceptions__end_error
|
|
extern struct Exception_Data End_Error;
|
|
|
|
#define Data_Error ada__io_exceptions__data_error
|
|
extern struct Exception_Data Data_Error;
|
|
|
|
#define Layout_Error ada__io_exceptions__layout_error
|
|
extern struct Exception_Data Layout_Error;
|
|
|
|
#define Non_Ada_Error system__aux_dec__non_ada_error
|
|
extern struct Exception_Data Non_Ada_Error;
|
|
|
|
#define Coded_Exception system__vms_exception_table__coded_exception
|
|
extern struct Exception_Data *Coded_Exception (Exception_Code);
|
|
|
|
#define Base_Code_In system__vms_exception_table__base_code_in
|
|
extern Exception_Code Base_Code_In (Exception_Code);
|
|
|
|
/* DEC Ada exceptions are not defined in a header file, so they
|
|
must be declared. */
|
|
|
|
#define ADA$_ALREADY_OPEN 0x0031a594
|
|
#define ADA$_CONSTRAINT_ERRO 0x00318324
|
|
#define ADA$_DATA_ERROR 0x003192c4
|
|
#define ADA$_DEVICE_ERROR 0x003195e4
|
|
#define ADA$_END_ERROR 0x00319904
|
|
#define ADA$_FAC_MODE_MISMAT 0x0031a8b3
|
|
#define ADA$_IOSYSFAILED 0x0031af04
|
|
#define ADA$_KEYSIZERR 0x0031aa3c
|
|
#define ADA$_KEY_MISMATCH 0x0031a8e3
|
|
#define ADA$_LAYOUT_ERROR 0x00319c24
|
|
#define ADA$_LINEXCMRS 0x0031a8f3
|
|
#define ADA$_MAXLINEXC 0x0031a8eb
|
|
#define ADA$_MODE_ERROR 0x00319f44
|
|
#define ADA$_MRN_MISMATCH 0x0031a8db
|
|
#define ADA$_MRS_MISMATCH 0x0031a8d3
|
|
#define ADA$_NAME_ERROR 0x0031a264
|
|
#define ADA$_NOT_OPEN 0x0031a58c
|
|
#define ADA$_ORG_MISMATCH 0x0031a8bb
|
|
#define ADA$_PROGRAM_ERROR 0x00318964
|
|
#define ADA$_RAT_MISMATCH 0x0031a8cb
|
|
#define ADA$_RFM_MISMATCH 0x0031a8c3
|
|
#define ADA$_STAOVF 0x00318cac
|
|
#define ADA$_STATUS_ERROR 0x0031a584
|
|
#define ADA$_STORAGE_ERROR 0x00318c84
|
|
#define ADA$_UNSUPPORTED 0x0031a8ab
|
|
#define ADA$_USE_ERROR 0x0031a8a4
|
|
|
|
/* DEC Ada specific conditions. */
|
|
static const struct cond_except dec_ada_cond_except_table [] = {
|
|
{ADA$_PROGRAM_ERROR, &program_error},
|
|
{ADA$_USE_ERROR, &Use_Error},
|
|
{ADA$_KEYSIZERR, &program_error},
|
|
{ADA$_STAOVF, &storage_error},
|
|
{ADA$_CONSTRAINT_ERRO, &constraint_error},
|
|
{ADA$_IOSYSFAILED, &Device_Error},
|
|
{ADA$_LAYOUT_ERROR, &Layout_Error},
|
|
{ADA$_STORAGE_ERROR, &storage_error},
|
|
{ADA$_DATA_ERROR, &Data_Error},
|
|
{ADA$_DEVICE_ERROR, &Device_Error},
|
|
{ADA$_END_ERROR, &End_Error},
|
|
{ADA$_MODE_ERROR, &Mode_Error},
|
|
{ADA$_NAME_ERROR, &Name_Error},
|
|
{ADA$_STATUS_ERROR, &Status_Error},
|
|
{ADA$_NOT_OPEN, &Use_Error},
|
|
{ADA$_ALREADY_OPEN, &Use_Error},
|
|
{ADA$_USE_ERROR, &Use_Error},
|
|
{ADA$_UNSUPPORTED, &Use_Error},
|
|
{ADA$_FAC_MODE_MISMAT, &Use_Error},
|
|
{ADA$_ORG_MISMATCH, &Use_Error},
|
|
{ADA$_RFM_MISMATCH, &Use_Error},
|
|
{ADA$_RAT_MISMATCH, &Use_Error},
|
|
{ADA$_MRS_MISMATCH, &Use_Error},
|
|
{ADA$_MRN_MISMATCH, &Use_Error},
|
|
{ADA$_KEY_MISMATCH, &Use_Error},
|
|
{ADA$_MAXLINEXC, &constraint_error},
|
|
{ADA$_LINEXCMRS, &constraint_error},
|
|
|
|
#if 0
|
|
/* Already handled by a pragma Import_Exception
|
|
in Aux_IO_Exceptions */
|
|
{ADA$_LOCK_ERROR, &Lock_Error},
|
|
{ADA$_EXISTENCE_ERROR, &Existence_Error},
|
|
{ADA$_KEY_ERROR, &Key_Error},
|
|
#endif
|
|
|
|
{0, 0}
|
|
};
|
|
|
|
#endif /* IN_RTS */
|
|
|
|
/* Non-DEC Ada specific conditions. We could probably also put
|
|
SS$_HPARITH here and possibly SS$_ACCVIO, SS$_STKOVF. */
|
|
static const struct cond_except cond_except_table [] = {
|
|
{MTH$_FLOOVEMAT, &constraint_error},
|
|
{SS$_INTDIV, &constraint_error},
|
|
{0, 0}
|
|
};
|
|
|
|
/* To deal with VMS conditions and their mapping to Ada exceptions,
|
|
the __gnat_error_handler routine below is installed as an exception
|
|
vector having precedence over DEC frame handlers. Some conditions
|
|
still need to be handled by such handlers, however, in which case
|
|
__gnat_error_handler needs to return SS$_RESIGNAL. Consider for
|
|
instance the use of a third party library compiled with DECAda and
|
|
performing its own exception handling internally.
|
|
|
|
To allow some user-level flexibility, which conditions should be
|
|
resignaled is controlled by a predicate function, provided with the
|
|
condition value and returning a boolean indication stating whether
|
|
this condition should be resignaled or not.
|
|
|
|
That predicate function is called indirectly, via a function pointer,
|
|
by __gnat_error_handler, and changing that pointer is allowed to the
|
|
user code by way of the __gnat_set_resignal_predicate interface.
|
|
|
|
The user level function may then implement what it likes, including
|
|
for instance the maintenance of a dynamic data structure if the set
|
|
of to be resignalled conditions has to change over the program's
|
|
lifetime.
|
|
|
|
??? This is not a perfect solution to deal with the possible
|
|
interactions between the GNAT and the DECAda exception handling
|
|
models and better (more general) schemes are studied. This is so
|
|
just provided as a convenient workaround in the meantime, and
|
|
should be use with caution since the implementation has been kept
|
|
very simple. */
|
|
|
|
typedef int
|
|
resignal_predicate (int code);
|
|
|
|
static const int * const cond_resignal_table [] = {
|
|
&C$_SIGKILL,
|
|
(int *)CMA$_EXIT_THREAD,
|
|
&SS$_DEBUG,
|
|
&LIB$_KEYNOTFOU,
|
|
&LIB$_ACTIMAGE,
|
|
(int *) RDB$_STREAM_EOF,
|
|
(int *) FDL$_UNPRIKW,
|
|
0
|
|
};
|
|
|
|
static const int facility_resignal_table [] = {
|
|
0x1380000, /* RDB */
|
|
0x2220000, /* SQL */
|
|
0
|
|
};
|
|
|
|
/* Default GNAT predicate for resignaling conditions. */
|
|
|
|
static int
|
|
__gnat_default_resignal_p (int code)
|
|
{
|
|
int i, iexcept;
|
|
|
|
for (i = 0; facility_resignal_table [i]; i++)
|
|
if ((code & 0xfff0000) == facility_resignal_table [i])
|
|
return 1;
|
|
|
|
for (i = 0, iexcept = 0;
|
|
cond_resignal_table [i]
|
|
&& !(iexcept = LIB$MATCH_COND (&code, &cond_resignal_table [i]));
|
|
i++);
|
|
|
|
return iexcept;
|
|
}
|
|
|
|
/* Static pointer to predicate that the __gnat_error_handler exception
|
|
vector invokes to determine if it should resignal a condition. */
|
|
|
|
static resignal_predicate *__gnat_resignal_p = __gnat_default_resignal_p;
|
|
|
|
/* User interface to change the predicate pointer to PREDICATE. Reset to
|
|
the default if PREDICATE is null. */
|
|
|
|
void
|
|
__gnat_set_resignal_predicate (resignal_predicate *predicate)
|
|
{
|
|
if (predicate == NULL)
|
|
__gnat_resignal_p = __gnat_default_resignal_p;
|
|
else
|
|
__gnat_resignal_p = predicate;
|
|
}
|
|
|
|
/* Should match System.Parameters.Default_Exception_Msg_Max_Length. */
|
|
#define Default_Exception_Msg_Max_Length 512
|
|
|
|
/* Action routine for SYS$PUTMSG. There may be multiple
|
|
conditions, each with text to be appended to MESSAGE
|
|
and separated by line termination. */
|
|
|
|
static int
|
|
copy_msg (struct descriptor_s *msgdesc, char *message)
|
|
{
|
|
int len = strlen (message);
|
|
int copy_len;
|
|
|
|
/* Check for buffer overflow and skip. */
|
|
if (len > 0 && len <= Default_Exception_Msg_Max_Length - 3)
|
|
{
|
|
strcat (message, "\r\n");
|
|
len += 2;
|
|
}
|
|
|
|
/* Check for buffer overflow and truncate if necessary. */
|
|
copy_len = (len + msgdesc->len <= Default_Exception_Msg_Max_Length - 1 ?
|
|
msgdesc->len :
|
|
Default_Exception_Msg_Max_Length - 1 - len);
|
|
strncpy (&message [len], msgdesc->adr, copy_len);
|
|
message [len + copy_len] = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
long
|
|
__gnat_handle_vms_condition (int *sigargs, void *mechargs)
|
|
{
|
|
struct Exception_Data *exception = 0;
|
|
Exception_Code base_code;
|
|
struct descriptor_s gnat_facility = {4, 0, "GNAT"};
|
|
char message [Default_Exception_Msg_Max_Length];
|
|
|
|
const char *msg = "";
|
|
|
|
/* Check for conditions to resignal which aren't effected by pragma
|
|
Import_Exception. */
|
|
if (__gnat_resignal_p (sigargs [1]))
|
|
return SS$_RESIGNAL;
|
|
|
|
#ifdef IN_RTS
|
|
/* See if it's an imported exception. Beware that registered exceptions
|
|
are bound to their base code, with the severity bits masked off. */
|
|
base_code = Base_Code_In ((Exception_Code) sigargs[1]);
|
|
exception = Coded_Exception (base_code);
|
|
|
|
if (exception)
|
|
{
|
|
message[0] = 0;
|
|
|
|
/* Subtract PC & PSL fields which messes with PUTMSG. */
|
|
sigargs[0] -= 2;
|
|
SYS$PUTMSG (sigargs, copy_msg, &gnat_facility, message);
|
|
sigargs[0] += 2;
|
|
msg = message;
|
|
|
|
exception->Name_Length = 19;
|
|
/* ??? The full name really should be get SYS$GETMSG returns. */
|
|
exception->Full_Name = "IMPORTED_EXCEPTION";
|
|
exception->Import_Code = base_code;
|
|
|
|
#ifdef __IA64
|
|
/* Do not adjust the program counter as already points to the next
|
|
instruction (just after the call to LIB$STOP). */
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
if (exception == 0)
|
|
switch (sigargs[1])
|
|
{
|
|
case SS$_ACCVIO:
|
|
if (sigargs[3] == 0)
|
|
{
|
|
exception = &constraint_error;
|
|
msg = "access zero";
|
|
}
|
|
else
|
|
{
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
}
|
|
__gnat_adjust_context_for_raise (SS$_ACCVIO, (void *)mechargs);
|
|
break;
|
|
|
|
case SS$_STKOVF:
|
|
exception = &storage_error;
|
|
msg = "stack overflow";
|
|
__gnat_adjust_context_for_raise (SS$_STKOVF, (void *)mechargs);
|
|
break;
|
|
|
|
case SS$_HPARITH:
|
|
#ifndef IN_RTS
|
|
return SS$_RESIGNAL; /* toplev.c handles for compiler */
|
|
#else
|
|
exception = &constraint_error;
|
|
msg = "arithmetic error";
|
|
__gnat_adjust_context_for_raise (SS$_HPARITH, (void *)mechargs);
|
|
#endif
|
|
break;
|
|
|
|
default:
|
|
#ifdef IN_RTS
|
|
{
|
|
int i;
|
|
|
|
/* Scan the DEC Ada exception condition table for a match and fetch
|
|
the associated GNAT exception pointer. */
|
|
for (i = 0;
|
|
dec_ada_cond_except_table [i].cond &&
|
|
!LIB$MATCH_COND (&sigargs [1],
|
|
&dec_ada_cond_except_table [i].cond);
|
|
i++);
|
|
exception = (struct Exception_Data *)
|
|
dec_ada_cond_except_table [i].except;
|
|
|
|
if (!exception)
|
|
{
|
|
/* Scan the VMS standard condition table for a match and fetch
|
|
the associated GNAT exception pointer. */
|
|
for (i = 0;
|
|
cond_except_table[i].cond &&
|
|
!LIB$MATCH_COND (&sigargs[1], &cond_except_table[i].cond);
|
|
i++);
|
|
exception = (struct Exception_Data *)
|
|
cond_except_table [i].except;
|
|
|
|
if (!exception)
|
|
/* User programs expect Non_Ada_Error to be raised, reference
|
|
DEC Ada test CXCONDHAN. */
|
|
exception = &Non_Ada_Error;
|
|
}
|
|
}
|
|
#else
|
|
exception = &program_error;
|
|
#endif
|
|
message[0] = 0;
|
|
/* Subtract PC & PSL fields which messes with PUTMSG. */
|
|
sigargs[0] -= 2;
|
|
SYS$PUTMSG (sigargs, copy_msg, &gnat_facility, message);
|
|
sigargs[0] += 2;
|
|
msg = message;
|
|
break;
|
|
}
|
|
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
long prvhnd ATTRIBUTE_UNUSED;
|
|
|
|
#if !defined (IN_RTS)
|
|
SYS$SETEXV (1, __gnat_handle_vms_condition, 3, &prvhnd);
|
|
#endif
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/* __gnat_adjust_context_for_raise for Alpha - see comments along with the
|
|
default version later in this file. */
|
|
|
|
#if defined (IN_RTS) && defined (__alpha__)
|
|
|
|
#include <vms/chfctxdef.h>
|
|
#include <vms/chfdef.h>
|
|
|
|
#define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
|
void
|
|
__gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
{
|
|
if (signo == SS$_HPARITH)
|
|
{
|
|
/* Sub one to the address of the instruction signaling the condition,
|
|
located in the sigargs array. */
|
|
|
|
CHF$MECH_ARRAY * mechargs = (CHF$MECH_ARRAY *) ucontext;
|
|
CHF$SIGNAL_ARRAY * sigargs
|
|
= (CHF$SIGNAL_ARRAY *) mechargs->chf$q_mch_sig_addr;
|
|
|
|
int vcount = sigargs->chf$is_sig_args;
|
|
int * pc_slot = & (&sigargs->chf$l_sig_name)[vcount-2];
|
|
|
|
(*pc_slot)--;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/* __gnat_adjust_context_for_raise for ia64. */
|
|
|
|
#if defined (IN_RTS) && defined (__IA64)
|
|
|
|
#include <vms/chfctxdef.h>
|
|
#include <vms/chfdef.h>
|
|
|
|
#define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
|
typedef unsigned long long u64;
|
|
|
|
void
|
|
__gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
{
|
|
/* Add one to the address of the instruction signaling the condition,
|
|
located in the 64bits sigargs array. */
|
|
|
|
CHF$MECH_ARRAY * mechargs = (CHF$MECH_ARRAY *) ucontext;
|
|
|
|
CHF64$SIGNAL_ARRAY *chfsig64
|
|
= (CHF64$SIGNAL_ARRAY *) mechargs->chf$ph_mch_sig64_addr;
|
|
|
|
u64 * post_sigarray
|
|
= (u64 *)chfsig64 + 1 + chfsig64->chf64$l_sig_args;
|
|
|
|
u64 * ih_pc_loc = post_sigarray - 2;
|
|
|
|
(*ih_pc_loc) ++;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Easier interface for LIB$GET_LOGICAL: put the equivalence of NAME into BUF,
|
|
always NUL terminated. In case of error or if the result is longer than
|
|
LEN (length of BUF) an empty string is written info BUF. */
|
|
|
|
static void
|
|
__gnat_vms_get_logical (const char *name, char *buf, int len)
|
|
{
|
|
struct descriptor_s name_desc, result_desc;
|
|
int status;
|
|
unsigned short rlen;
|
|
|
|
/* Build the descriptor for NAME. */
|
|
name_desc.len = strlen (name);
|
|
name_desc.mbz = 0;
|
|
name_desc.adr = (char *)name;
|
|
|
|
/* Build the descriptor for the result. */
|
|
result_desc.len = len;
|
|
result_desc.mbz = 0;
|
|
result_desc.adr = buf;
|
|
|
|
status = LIB$GET_LOGICAL (&name_desc, &result_desc, &rlen);
|
|
|
|
if ((status & 1) == 1 && rlen < len)
|
|
buf[rlen] = 0;
|
|
else
|
|
buf[0] = 0;
|
|
}
|
|
|
|
/* Size of a page on ia64 and alpha VMS. */
|
|
#define VMS_PAGESIZE 8192
|
|
|
|
/* User mode. */
|
|
#define PSL__C_USER 3
|
|
|
|
/* No access. */
|
|
#define PRT__C_NA 0
|
|
|
|
/* Descending region. */
|
|
#define VA__M_DESCEND 1
|
|
|
|
/* Get by virtual address. */
|
|
#define VA___REGSUM_BY_VA 1
|
|
|
|
/* Memory region summary. */
|
|
struct regsum
|
|
{
|
|
unsigned long long q_region_id;
|
|
unsigned int l_flags;
|
|
unsigned int l_region_protection;
|
|
void *pq_start_va;
|
|
unsigned long long q_region_size;
|
|
void *pq_first_free_va;
|
|
};
|
|
|
|
extern int SYS$GET_REGION_INFO (unsigned int, unsigned long long *,
|
|
void *, void *, unsigned int,
|
|
void *, unsigned int *);
|
|
extern int SYS$EXPREG_64 (unsigned long long *, unsigned long long,
|
|
unsigned int, unsigned int, void **,
|
|
unsigned long long *);
|
|
extern int SYS$SETPRT_64 (void *, unsigned long long, unsigned int,
|
|
unsigned int, void **, unsigned long long *,
|
|
unsigned int *);
|
|
extern int SYS$PUTMSG (void *, int (*)(), void *, unsigned long long);
|
|
|
|
/* Add a guard page in the memory region containing ADDR at ADDR +/- SIZE.
|
|
(The sign depends on the kind of the memory region). */
|
|
|
|
static int
|
|
__gnat_set_stack_guard_page (void *addr, unsigned long size)
|
|
{
|
|
int status;
|
|
void *ret_va;
|
|
unsigned long long ret_len;
|
|
unsigned int ret_prot;
|
|
void *start_va;
|
|
unsigned long long length;
|
|
unsigned int retlen;
|
|
struct regsum buffer;
|
|
|
|
/* Get the region for ADDR. */
|
|
status = SYS$GET_REGION_INFO
|
|
(VA___REGSUM_BY_VA, NULL, addr, NULL, sizeof (buffer), &buffer, &retlen);
|
|
|
|
if ((status & 1) != 1)
|
|
return -1;
|
|
|
|
/* Extend the region. */
|
|
status = SYS$EXPREG_64 (&buffer.q_region_id,
|
|
size, 0, 0, &start_va, &length);
|
|
|
|
if ((status & 1) != 1)
|
|
return -1;
|
|
|
|
/* Create a guard page. */
|
|
if (!(buffer.l_flags & VA__M_DESCEND))
|
|
start_va = (void *)((unsigned long long)start_va + length - VMS_PAGESIZE);
|
|
|
|
status = SYS$SETPRT_64 (start_va, VMS_PAGESIZE, PSL__C_USER, PRT__C_NA,
|
|
&ret_va, &ret_len, &ret_prot);
|
|
|
|
if ((status & 1) != 1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/* Read logicals to limit the stack(s) size. */
|
|
|
|
static void
|
|
__gnat_set_stack_limit (void)
|
|
{
|
|
#ifdef __ia64__
|
|
void *sp;
|
|
unsigned long size;
|
|
char value[16];
|
|
char *e;
|
|
|
|
/* The main stack. */
|
|
__gnat_vms_get_logical ("GNAT_STACK_SIZE", value, sizeof (value));
|
|
size = strtoul (value, &e, 0);
|
|
if (e > value && *e == 0)
|
|
{
|
|
asm ("mov %0=sp" : "=r" (sp));
|
|
__gnat_set_stack_guard_page (sp, size * 1024);
|
|
}
|
|
|
|
/* The register stack. */
|
|
__gnat_vms_get_logical ("GNAT_RBS_SIZE", value, sizeof (value));
|
|
size = strtoul (value, &e, 0);
|
|
if (e > value && *e == 0)
|
|
{
|
|
asm ("mov %0=ar.bsp" : "=r" (sp));
|
|
__gnat_set_stack_guard_page (sp, size * 1024);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Feature logical name and global variable address pair.
|
|
If we ever add another feature logical to this list, the
|
|
feature struct will need to be enhanced to take into account
|
|
possible values for *gl_addr. */
|
|
struct feature {
|
|
const char *name;
|
|
int *gl_addr;
|
|
};
|
|
|
|
/* Default values for GNAT features set by environment. */
|
|
int __gl_heap_size = 64;
|
|
|
|
/* Array feature logical names and global variable addresses. */
|
|
static const struct feature features[] = {
|
|
{"GNAT$NO_MALLOC_64", &__gl_heap_size},
|
|
{0, 0}
|
|
};
|
|
|
|
void
|
|
__gnat_set_features (void)
|
|
{
|
|
int i;
|
|
char buff[16];
|
|
|
|
/* Loop through features array and test name for enable/disable. */
|
|
for (i = 0; features[i].name; i++)
|
|
{
|
|
__gnat_vms_get_logical (features[i].name, buff, sizeof (buff));
|
|
|
|
if (strcmp (buff, "ENABLE") == 0
|
|
|| strcmp (buff, "TRUE") == 0
|
|
|| strcmp (buff, "1") == 0)
|
|
*features[i].gl_addr = 32;
|
|
else if (strcmp (buff, "DISABLE") == 0
|
|
|| strcmp (buff, "FALSE") == 0
|
|
|| strcmp (buff, "0") == 0)
|
|
*features[i].gl_addr = 64;
|
|
}
|
|
|
|
/* Features to artificially limit the stack size. */
|
|
__gnat_set_stack_limit ();
|
|
|
|
__gnat_features_set = 1;
|
|
}
|
|
|
|
/* Return true if the VMS version is 7.x. */
|
|
|
|
extern unsigned int LIB$GETSYI (int *, ...);
|
|
|
|
#define SYI$_VERSION 0x1000
|
|
|
|
int
|
|
__gnat_is_vms_v7 (void)
|
|
{
|
|
struct descriptor_s desc;
|
|
char version[8];
|
|
int status;
|
|
int code = SYI$_VERSION;
|
|
|
|
desc.len = sizeof (version);
|
|
desc.mbz = 0;
|
|
desc.adr = version;
|
|
|
|
status = LIB$GETSYI (&code, 0, &desc);
|
|
if ((status & 1) == 1 && version[1] == '7' && version[2] == '.')
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/*******************/
|
|
/* FreeBSD Section */
|
|
/*******************/
|
|
|
|
#elif defined (__FreeBSD__)
|
|
|
|
#include <signal.h>
|
|
#include <sys/ucontext.h>
|
|
#include <unistd.h>
|
|
|
|
static void
|
|
__gnat_error_handler (int sig,
|
|
siginfo_t *si ATTRIBUTE_UNUSED,
|
|
void *ucontext ATTRIBUTE_UNUSED)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
|
|
case SIGILL:
|
|
exception = &constraint_error;
|
|
msg = "SIGILL";
|
|
break;
|
|
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
break;
|
|
|
|
case SIGBUS:
|
|
exception = &storage_error;
|
|
msg = "SIGBUS: possible stack overflow";
|
|
break;
|
|
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler ()
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* Set up signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! */
|
|
|
|
act.sa_sigaction
|
|
= (void (*)(int, struct __siginfo *, void*)) __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
(void) sigemptyset (&act.sa_mask);
|
|
|
|
(void) sigaction (SIGILL, &act, NULL);
|
|
(void) sigaction (SIGFPE, &act, NULL);
|
|
(void) sigaction (SIGSEGV, &act, NULL);
|
|
(void) sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/*******************/
|
|
/* VxWorks Section */
|
|
/*******************/
|
|
|
|
#elif defined(__vxworks)
|
|
|
|
#include <signal.h>
|
|
#include <taskLib.h>
|
|
|
|
#ifndef __RTP__
|
|
#include <intLib.h>
|
|
#include <iv.h>
|
|
#endif
|
|
|
|
#ifdef VTHREADS
|
|
#include "private/vThreadsP.h"
|
|
#endif
|
|
|
|
void __gnat_error_handler (int, void *, struct sigcontext *);
|
|
|
|
#ifndef __RTP__
|
|
|
|
/* Directly vectored Interrupt routines are not supported when using RTPs. */
|
|
|
|
extern int __gnat_inum_to_ivec (int);
|
|
|
|
/* This is needed by the GNAT run time to handle Vxworks interrupts. */
|
|
int
|
|
__gnat_inum_to_ivec (int num)
|
|
{
|
|
return INUM_TO_IVEC (num);
|
|
}
|
|
#endif
|
|
|
|
#if !defined(__alpha_vxworks) && (_WRS_VXWORKS_MAJOR != 6) && !defined(__RTP__)
|
|
|
|
/* getpid is used by s-parint.adb, but is not defined by VxWorks, except
|
|
on Alpha VxWorks and VxWorks 6.x (including RTPs). */
|
|
|
|
extern long getpid (void);
|
|
|
|
long
|
|
getpid (void)
|
|
{
|
|
return taskIdSelf ();
|
|
}
|
|
#endif
|
|
|
|
/* VxWorks 653 vThreads expects the field excCnt to be zeroed when a signal is.
|
|
handled. The VxWorks version of longjmp does this; GCC's builtin_longjmp
|
|
doesn't. */
|
|
void
|
|
__gnat_clear_exception_count (void)
|
|
{
|
|
#ifdef VTHREADS
|
|
WIND_TCB *currentTask = (WIND_TCB *) taskIdSelf();
|
|
|
|
currentTask->vThreads.excCnt = 0;
|
|
#endif
|
|
}
|
|
|
|
/* Handle different SIGnal to exception mappings in different VxWorks
|
|
versions. */
|
|
static void
|
|
__gnat_map_signal (int sig, void *si ATTRIBUTE_UNUSED,
|
|
struct sigcontext *sc ATTRIBUTE_UNUSED)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
#ifdef VTHREADS
|
|
#ifdef __VXWORKSMILS__
|
|
case SIGILL:
|
|
exception = &storage_error;
|
|
msg = "SIGILL: possible stack overflow";
|
|
break;
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "SIGSEGV";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &program_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
#else
|
|
case SIGILL:
|
|
exception = &constraint_error;
|
|
msg = "Floating point exception or SIGILL";
|
|
break;
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "SIGSEGV";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &storage_error;
|
|
msg = "SIGBUS: possible stack overflow";
|
|
break;
|
|
#endif
|
|
#elif (_WRS_VXWORKS_MAJOR == 6)
|
|
case SIGILL:
|
|
exception = &constraint_error;
|
|
msg = "SIGILL";
|
|
break;
|
|
#ifdef __RTP__
|
|
/* In RTP mode a SIGSEGV is most likely due to a stack overflow,
|
|
since stack checking uses the probing mechanism. */
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "SIGSEGV: possible stack overflow";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &program_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
#else
|
|
/* VxWorks 6 kernel mode with probing. SIGBUS for guard page hit */
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "SIGSEGV";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &storage_error;
|
|
msg = "SIGBUS: possible stack overflow";
|
|
break;
|
|
#endif
|
|
#else
|
|
/* VxWorks 5: a SIGILL is most likely due to a stack overflow,
|
|
since stack checking uses the stack limit mechanism. */
|
|
case SIGILL:
|
|
exception = &storage_error;
|
|
msg = "SIGILL: possible stack overflow";
|
|
break;
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "SIGSEGV";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &program_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
#endif
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
__gnat_clear_exception_count ();
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
/* Tasking and Non-tasking signal handler. Map SIGnal to Ada exception
|
|
propagation after the required low level adjustments. */
|
|
|
|
void
|
|
__gnat_error_handler (int sig, void *si, struct sigcontext *sc)
|
|
{
|
|
sigset_t mask;
|
|
|
|
/* VxWorks will always mask out the signal during the signal handler and
|
|
will reenable it on a longjmp. GNAT does not generate a longjmp to
|
|
return from a signal handler so the signal will still be masked unless
|
|
we unmask it. */
|
|
sigprocmask (SIG_SETMASK, NULL, &mask);
|
|
sigdelset (&mask, sig);
|
|
sigprocmask (SIG_SETMASK, &mask, NULL);
|
|
|
|
#if defined (__PPC__) && defined(_WRS_KERNEL)
|
|
/* On PowerPC, kernel mode, we process signals through a Call Frame Info
|
|
trampoline, voiding the need for myriads of fallback_frame_state
|
|
variants in the ZCX runtime. We have no simple way to distinguish ZCX
|
|
from SJLJ here, so we do this for SJLJ as well even though this is not
|
|
necessary. This only incurs a few extra instructions and a tiny
|
|
amount of extra stack usage. */
|
|
|
|
#include "sigtramp.h"
|
|
|
|
__gnat_sigtramp (sig, (void *)si, (void *)sc,
|
|
(sighandler_t *)&__gnat_map_signal);
|
|
|
|
#else
|
|
__gnat_map_signal (sig, si, sc);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* Setup signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! */
|
|
|
|
act.sa_handler = __gnat_error_handler;
|
|
act.sa_flags = SA_SIGINFO | SA_ONSTACK;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* For VxWorks, install all signal handlers, since pragma Interrupt_State
|
|
applies to vectored hardware interrupts, not signals. */
|
|
sigaction (SIGFPE, &act, NULL);
|
|
sigaction (SIGILL, &act, NULL);
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
#define HAVE_GNAT_INIT_FLOAT
|
|
|
|
void
|
|
__gnat_init_float (void)
|
|
{
|
|
/* Disable overflow/underflow exceptions on the PPC processor, needed
|
|
to get correct Ada semantics. Note that for AE653 vThreads, the HW
|
|
overflow settings are an OS configuration issue. The instructions
|
|
below have no effect. */
|
|
#if defined (_ARCH_PPC) && !defined (_SOFT_FLOAT) && (!defined (VTHREADS) || defined (__VXWORKSMILS__))
|
|
#if defined (__SPE__)
|
|
{
|
|
const unsigned long spefscr_mask = 0xfffffff3;
|
|
unsigned long spefscr;
|
|
asm ("mfspr %0, 512" : "=r" (spefscr));
|
|
spefscr = spefscr & spefscr_mask;
|
|
asm ("mtspr 512, %0\n\tisync" : : "r" (spefscr));
|
|
}
|
|
#else
|
|
asm ("mtfsb0 25");
|
|
asm ("mtfsb0 26");
|
|
#endif
|
|
#endif
|
|
|
|
#if (defined (__i386__) || defined (i386)) && !defined (VTHREADS)
|
|
/* This is used to properly initialize the FPU on an x86 for each
|
|
process thread. */
|
|
asm ("finit");
|
|
#endif
|
|
|
|
/* Similarly for SPARC64. Achieved by masking bits in the Trap Enable Mask
|
|
field of the Floating-point Status Register (see the SPARC Architecture
|
|
Manual Version 9, p 48). */
|
|
#if defined (sparc64)
|
|
|
|
#define FSR_TEM_NVM (1 << 27) /* Invalid operand */
|
|
#define FSR_TEM_OFM (1 << 26) /* Overflow */
|
|
#define FSR_TEM_UFM (1 << 25) /* Underflow */
|
|
#define FSR_TEM_DZM (1 << 24) /* Division by Zero */
|
|
#define FSR_TEM_NXM (1 << 23) /* Inexact result */
|
|
{
|
|
unsigned int fsr;
|
|
|
|
__asm__("st %%fsr, %0" : "=m" (fsr));
|
|
fsr &= ~(FSR_TEM_OFM | FSR_TEM_UFM);
|
|
__asm__("ld %0, %%fsr" : : "m" (fsr));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* This subprogram is called by System.Task_Primitives.Operations.Enter_Task
|
|
(if not null) when a new task is created. It is initialized by
|
|
System.Stack_Checking.Operations.Initialize_Stack_Limit.
|
|
The use of a hook avoids to drag stack checking subprograms if stack
|
|
checking is not used. */
|
|
void (*__gnat_set_stack_limit_hook)(void) = (void (*)(void))0;
|
|
|
|
/******************/
|
|
/* NetBSD Section */
|
|
/******************/
|
|
|
|
#elif defined(__NetBSD__)
|
|
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
static void
|
|
__gnat_error_handler (int sig)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch(sig)
|
|
{
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
case SIGILL:
|
|
exception = &constraint_error;
|
|
msg = "SIGILL";
|
|
break;
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &constraint_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler(exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler(void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
act.sa_handler = __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER | SA_RESTART;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/*******************/
|
|
/* OpenBSD Section */
|
|
/*******************/
|
|
|
|
#elif defined(__OpenBSD__)
|
|
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
static void
|
|
__gnat_error_handler (int sig)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
switch(sig)
|
|
{
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
case SIGILL:
|
|
exception = &constraint_error;
|
|
msg = "SIGILL";
|
|
break;
|
|
case SIGSEGV:
|
|
exception = &storage_error;
|
|
msg = "stack overflow or erroneous memory access";
|
|
break;
|
|
case SIGBUS:
|
|
exception = &constraint_error;
|
|
msg = "SIGBUS";
|
|
break;
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler(exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler(void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
act.sa_handler = __gnat_error_handler;
|
|
act.sa_flags = SA_NODEFER | SA_RESTART;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System" */
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
/******************/
|
|
/* Darwin Section */
|
|
/******************/
|
|
|
|
#elif defined(__APPLE__)
|
|
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/sysctl.h>
|
|
#include <mach/mach_vm.h>
|
|
#include <mach/mach_init.h>
|
|
#include <mach/vm_statistics.h>
|
|
|
|
/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
|
|
char __gnat_alternate_stack[32 * 1024]; /* 1 * MINSIGSTKSZ */
|
|
|
|
/* Defined in xnu unix_signal.c.
|
|
Tell the kernel to re-use alt stack when delivering a signal. */
|
|
#define UC_RESET_ALT_STACK 0x80000000
|
|
|
|
/* Return true if ADDR is within a stack guard area. */
|
|
static int
|
|
__gnat_is_stack_guard (mach_vm_address_t addr)
|
|
{
|
|
kern_return_t kret;
|
|
vm_region_submap_info_data_64_t info;
|
|
mach_vm_address_t start;
|
|
mach_vm_size_t size;
|
|
natural_t depth;
|
|
mach_msg_type_number_t count;
|
|
|
|
count = VM_REGION_SUBMAP_INFO_COUNT_64;
|
|
start = addr;
|
|
size = -1;
|
|
depth = 9999;
|
|
kret = mach_vm_region_recurse (mach_task_self (), &start, &size, &depth,
|
|
(vm_region_recurse_info_t) &info, &count);
|
|
if (kret == KERN_SUCCESS
|
|
&& addr >= start && addr < (start + size)
|
|
&& info.protection == VM_PROT_NONE
|
|
&& info.user_tag == VM_MEMORY_STACK)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
#define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
|
#if defined (__x86_64__)
|
|
static int
|
|
__darwin_major_version (void)
|
|
{
|
|
static int cache = -1;
|
|
if (cache < 0)
|
|
{
|
|
int mib[2] = {CTL_KERN, KERN_OSRELEASE};
|
|
size_t len;
|
|
|
|
/* Find out how big the buffer needs to be (and set cache to 0
|
|
on failure). */
|
|
if (sysctl (mib, 2, NULL, &len, NULL, 0) == 0)
|
|
{
|
|
char release[len];
|
|
sysctl (mib, 2, release, &len, NULL, 0);
|
|
/* Darwin releases are of the form L.M.N where L is the major
|
|
version, so strtol will return L. */
|
|
cache = (int) strtol (release, NULL, 10);
|
|
}
|
|
else
|
|
{
|
|
cache = 0;
|
|
}
|
|
}
|
|
return cache;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
__gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED,
|
|
void *ucontext ATTRIBUTE_UNUSED)
|
|
{
|
|
#if defined (__x86_64__)
|
|
if (__darwin_major_version () < 12)
|
|
{
|
|
/* Work around radar #10302855, where the unwinders (libunwind or
|
|
libgcc_s depending on the system revision) and the DWARF unwind
|
|
data for sigtramp have different ideas about register numbering,
|
|
causing rbx and rdx to be transposed. */
|
|
ucontext_t *uc = (ucontext_t *)ucontext;
|
|
unsigned long t = uc->uc_mcontext->__ss.__rbx;
|
|
|
|
uc->uc_mcontext->__ss.__rbx = uc->uc_mcontext->__ss.__rdx;
|
|
uc->uc_mcontext->__ss.__rdx = t;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
__gnat_error_handler (int sig, siginfo_t *si, void *ucontext)
|
|
{
|
|
struct Exception_Data *exception;
|
|
const char *msg;
|
|
|
|
__gnat_adjust_context_for_raise (sig, ucontext);
|
|
|
|
switch (sig)
|
|
{
|
|
case SIGSEGV:
|
|
case SIGBUS:
|
|
if (__gnat_is_stack_guard ((unsigned long)si->si_addr))
|
|
{
|
|
exception = &storage_error;
|
|
msg = "stack overflow";
|
|
}
|
|
else
|
|
{
|
|
exception = &constraint_error;
|
|
msg = "erroneous memory access";
|
|
}
|
|
/* Reset the use of alt stack, so that the alt stack will be used
|
|
for the next signal delivery.
|
|
The stack can't be used in case of stack checking. */
|
|
syscall (SYS_sigreturn, NULL, UC_RESET_ALT_STACK);
|
|
break;
|
|
|
|
case SIGFPE:
|
|
exception = &constraint_error;
|
|
msg = "SIGFPE";
|
|
break;
|
|
|
|
default:
|
|
exception = &program_error;
|
|
msg = "unhandled signal";
|
|
}
|
|
|
|
Raise_From_Signal_Handler (exception, msg);
|
|
}
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* Set up signal handler to map synchronous signals to appropriate
|
|
exceptions. Make sure that the handler isn't interrupted by another
|
|
signal that might cause a scheduling event! Also setup an alternate
|
|
stack region for the handler execution so that stack overflows can be
|
|
handled properly, avoiding a SEGV generation from stack usage by the
|
|
handler itself (and it is required by Darwin). */
|
|
|
|
stack_t stack;
|
|
stack.ss_sp = __gnat_alternate_stack;
|
|
stack.ss_size = sizeof (__gnat_alternate_stack);
|
|
stack.ss_flags = 0;
|
|
sigaltstack (&stack, NULL);
|
|
|
|
act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
act.sa_sigaction = __gnat_error_handler;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Do not install handlers if interrupt state is "System". */
|
|
if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
sigaction (SIGABRT, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
sigaction (SIGFPE, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
sigaction (SIGILL, &act, NULL);
|
|
|
|
act.sa_flags |= SA_ONSTACK;
|
|
if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
sigaction (SIGSEGV, &act, NULL);
|
|
if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
sigaction (SIGBUS, &act, NULL);
|
|
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
#else
|
|
|
|
/* For all other versions of GNAT, the handler does nothing. */
|
|
|
|
/*******************/
|
|
/* Default Section */
|
|
/*******************/
|
|
|
|
void
|
|
__gnat_install_handler (void)
|
|
{
|
|
__gnat_handler_installed = 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*********************/
|
|
/* __gnat_init_float */
|
|
/*********************/
|
|
|
|
/* This routine is called as each process thread is created, for possible
|
|
initialization of the FP processor. This version is used under INTERIX
|
|
and WIN32. */
|
|
|
|
#if defined (_WIN32) || defined (__INTERIX) \
|
|
|| defined (__Lynx__) || defined(__NetBSD__) || defined(__FreeBSD__) \
|
|
|| defined (__OpenBSD__)
|
|
|
|
#define HAVE_GNAT_INIT_FLOAT
|
|
|
|
void
|
|
__gnat_init_float (void)
|
|
{
|
|
#if defined (__i386__) || defined (i386) || defined (__x86_64)
|
|
|
|
/* This is used to properly initialize the FPU on an x86 for each
|
|
process thread. */
|
|
|
|
asm ("finit");
|
|
|
|
#endif /* Defined __i386__ */
|
|
}
|
|
#endif
|
|
|
|
#ifndef HAVE_GNAT_INIT_FLOAT
|
|
|
|
/* All targets without a specific __gnat_init_float will use an empty one. */
|
|
void
|
|
__gnat_init_float (void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/***********************************/
|
|
/* __gnat_adjust_context_for_raise */
|
|
/***********************************/
|
|
|
|
#ifndef HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
|
/* All targets without a specific version will use an empty one. */
|
|
|
|
/* Given UCONTEXT a pointer to a context structure received by a signal
|
|
handler for SIGNO, perform the necessary adjustments to let the handler
|
|
raise an exception. Calls to this routine are not conditioned by the
|
|
propagation scheme in use. */
|
|
|
|
void
|
|
__gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED,
|
|
void *ucontext ATTRIBUTE_UNUSED)
|
|
{
|
|
/* We used to compensate here for the raised from call vs raised from signal
|
|
exception discrepancy with the GCC ZCX scheme, but this now can be dealt
|
|
with generically in the unwinder (see GCC PR other/26208). This however
|
|
requires the use of the _Unwind_GetIPInfo routine in raise-gcc.c, which
|
|
is predicated on the definition of HAVE_GETIPINFO at compile time. Only
|
|
the VMS ports still do the compensation described in the few lines below.
|
|
|
|
*** Call vs signal exception discrepancy with GCC ZCX scheme ***
|
|
|
|
The GCC unwinder expects to be dealing with call return addresses, since
|
|
this is the "nominal" case of what we retrieve while unwinding a regular
|
|
call chain.
|
|
|
|
To evaluate if a handler applies at some point identified by a return
|
|
address, the propagation engine needs to determine what region the
|
|
corresponding call instruction pertains to. Because the return address
|
|
may not be attached to the same region as the call, the unwinder always
|
|
subtracts "some" amount from a return address to search the region
|
|
tables, amount chosen to ensure that the resulting address is inside the
|
|
call instruction.
|
|
|
|
When we raise an exception from a signal handler, e.g. to transform a
|
|
SIGSEGV into Storage_Error, things need to appear as if the signal
|
|
handler had been "called" by the instruction which triggered the signal,
|
|
so that exception handlers that apply there are considered. What the
|
|
unwinder will retrieve as the return address from the signal handler is
|
|
what it will find as the faulting instruction address in the signal
|
|
context pushed by the kernel. Leaving this address untouched looses, if
|
|
the triggering instruction happens to be the very first of a region, as
|
|
the later adjustments performed by the unwinder would yield an address
|
|
outside that region. We need to compensate for the unwinder adjustments
|
|
at some point, and this is what this routine is expected to do.
|
|
|
|
signo is passed because on some targets for some signals the PC in
|
|
context points to the instruction after the faulting one, in which case
|
|
the unwinder adjustment is still desired. */
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|