1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2004 Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, USA. *
22 * As a special exception, if you link this file with other files to *
23 * produce an executable, this file does not by itself cause the resulting *
24 * executable to be covered by the GNU General Public License. This except- *
25 * ion does not however invalidate any other reasons why the executable *
26 * file might be covered by the GNU Public License. *
28 * GNAT was originally developed by the GNAT team at New York University. *
29 * Extensive contributions were provided by Ada Core Technologies Inc. *
31 ****************************************************************************/
33 /* This unit contains initialization circuits that are system dependent. A
34 major part of the functionality involved involves stack overflow checking.
35 The GCC backend generates probe instructions to test for stack overflow.
36 For details on the exact approach used to generate these probes, see the
37 "Using and Porting GCC" manual, in particular the "Stack Checking" section
38 and the subsection "Specifying How Stack Checking is Done". The handlers
39 installed by this file are used to handle resulting signals that come
40 from these probes failing (i.e. touching protected pages) */
42 /* This file should be kept synchronized with 2sinit.ads, 2sinit.adb, and
43 5zinit.adb. All these files implement the required functionality for
46 /* The following include is here to meet the published VxWorks requirement
47 that the __vxworks header appear before any other include. */
57 /* We don't have libiberty, so us malloc. */
58 #define xmalloc(S) malloc (S)
67 extern void __gnat_raise_program_error (const char *, int);
69 /* Addresses of exception data blocks for predefined exceptions. */
70 extern struct Exception_Data constraint_error;
71 extern struct Exception_Data numeric_error;
72 extern struct Exception_Data program_error;
73 extern struct Exception_Data storage_error;
74 extern struct Exception_Data tasking_error;
75 extern struct Exception_Data _abort_signal;
77 #define Lock_Task system__soft_links__lock_task
78 extern void (*Lock_Task) (void);
80 #define Unlock_Task system__soft_links__unlock_task
81 extern void (*Unlock_Task) (void);
83 #define Get_Machine_State_Addr \
84 system__soft_links__get_machine_state_addr
85 extern struct Machine_State *(*Get_Machine_State_Addr) (void);
87 #define Check_Abort_Status \
88 system__soft_links__check_abort_status
89 extern int (*Check_Abort_Status) (void);
91 #define Raise_From_Signal_Handler \
92 ada__exceptions__raise_from_signal_handler
93 extern void Raise_From_Signal_Handler (struct Exception_Data *, const char *);
95 #define Propagate_Signal_Exception \
96 __gnat_propagate_sig_exc
97 extern void Propagate_Signal_Exception (struct Machine_State *,
98 struct Exception_Data *,
101 /* Copies of global values computed by the binder */
102 int __gl_main_priority = -1;
103 int __gl_time_slice_val = -1;
104 char __gl_wc_encoding = 'n';
105 char __gl_locking_policy = ' ';
106 char __gl_queuing_policy = ' ';
107 char __gl_task_dispatching_policy = ' ';
108 char *__gl_restrictions = 0;
109 char *__gl_interrupt_states = 0;
110 int __gl_num_interrupt_states = 0;
111 int __gl_unreserve_all_interrupts = 0;
112 int __gl_exception_tracebacks = 0;
113 int __gl_zero_cost_exceptions = 0;
114 int __gl_detect_blocking = 0;
116 /* Indication of whether synchronous signal handler has already been
117 installed by a previous call to adainit */
118 int __gnat_handler_installed = 0;
120 /* HAVE_GNAT_INIT_FLOAT must be set on every targets where a __gnat_init_float
121 is defined. If this is not set them a void implementation will be defined
122 at the end of this unit. */
123 #undef HAVE_GNAT_INIT_FLOAT
125 /******************************/
126 /* __gnat_get_interrupt_state */
127 /******************************/
129 char __gnat_get_interrupt_state (int);
131 /* This routine is called from the runtime as needed to determine the state
132 of an interrupt, as set by an Interrupt_State pragma appearing anywhere
133 in the current partition. The input argument is the interrupt number,
134 and the result is one of the following:
136 'n' this interrupt not set by any Interrupt_State pragma
137 'u' Interrupt_State pragma set state to User
138 'r' Interrupt_State pragma set state to Runtime
139 's' Interrupt_State pragma set state to System */
142 __gnat_get_interrupt_state (int intrup)
144 if (intrup >= __gl_num_interrupt_states)
147 return __gl_interrupt_states [intrup];
150 /**********************/
151 /* __gnat_set_globals */
152 /**********************/
154 /* This routine is called from the binder generated main program. It copies
155 the values for global quantities computed by the binder into the following
156 global locations. The reason that we go through this copy, rather than just
157 define the global locations in the binder generated file, is that they are
158 referenced from the runtime, which may be in a shared library, and the
159 binder file is not in the shared library. Global references across library
160 boundaries like this are not handled correctly in all systems. */
162 /* For detailed description of the parameters to this routine, see the
163 section titled Run-Time Globals in package Bindgen (bindgen.adb) */
166 __gnat_set_globals (int main_priority,
171 char task_dispatching_policy,
173 char *interrupt_states,
174 int num_interrupt_states,
175 int unreserve_all_interrupts,
176 int exception_tracebacks,
177 int zero_cost_exceptions,
180 static int already_called = 0;
182 /* If this procedure has been already called once, check that the
183 arguments in this call are consistent with the ones in the previous
184 calls. Otherwise, raise a Program_Error exception.
186 We do not check for consistency of the wide character encoding
187 method. This default affects only Wide_Text_IO where no explicit
188 coding method is given, and there is no particular reason to let
189 this default be affected by the source representation of a library
192 We do not check either for the consistency of exception tracebacks,
193 because exception tracebacks are not normally set in Stand-Alone
194 libraries. If a library or the main program set the exception
195 tracebacks, then they are never reset afterwards (see below).
197 The value of main_priority is meaningful only when we are invoked
198 from the main program elaboration routine of an Ada application.
199 Checking the consistency of this parameter should therefore not be
200 done. Since it is assured that the main program elaboration will
201 always invoke this procedure before any library elaboration
202 routine, only the value of main_priority during the first call
203 should be taken into account and all the subsequent ones should be
204 ignored. Note that the case where the main program is not written
205 in Ada is also properly handled, since the default value will then
206 be used for this parameter.
208 For identical reasons, the consistency of time_slice_val should not
213 if (__gl_locking_policy != locking_policy
214 || __gl_queuing_policy != queuing_policy
215 || __gl_task_dispatching_policy != task_dispatching_policy
216 || __gl_unreserve_all_interrupts != unreserve_all_interrupts
217 || __gl_zero_cost_exceptions != zero_cost_exceptions)
218 __gnat_raise_program_error (__FILE__, __LINE__);
220 /* If either a library or the main program set the exception traceback
221 flag, it is never reset later */
223 if (exception_tracebacks != 0)
224 __gl_exception_tracebacks = exception_tracebacks;
230 __gl_main_priority = main_priority;
231 __gl_time_slice_val = time_slice_val;
232 __gl_wc_encoding = wc_encoding;
233 __gl_locking_policy = locking_policy;
234 __gl_queuing_policy = queuing_policy;
235 __gl_restrictions = restrictions;
236 __gl_interrupt_states = interrupt_states;
237 __gl_num_interrupt_states = num_interrupt_states;
238 __gl_task_dispatching_policy = task_dispatching_policy;
239 __gl_unreserve_all_interrupts = unreserve_all_interrupts;
240 __gl_exception_tracebacks = exception_tracebacks;
241 __gl_detect_blocking = detect_blocking;
243 /* ??? __gl_zero_cost_exceptions is new in 3.15 and is referenced from
244 a-except.adb, which is also part of the compiler sources. Since the
245 compiler is built with an older release of GNAT, the call generated by
246 the old binder to this function does not provide any value for the
247 corresponding argument, so the global has to be initialized in some
248 reasonable other way. This could be removed as soon as the next major
252 __gl_zero_cost_exceptions = zero_cost_exceptions;
254 __gl_zero_cost_exceptions = 0;
255 /* We never build the compiler to run in ZCX mode currently anyway. */
259 /*********************/
260 /* __gnat_initialize */
261 /*********************/
263 /* __gnat_initialize is called at the start of execution of an Ada program
264 (the call is generated by the binder). The standard routine does nothing
265 at all; the intention is that this be replaced by system specific
266 code where initialization is required. */
268 /* Notes on the Zero Cost Exceptions scheme and its impact on the signal
269 handlers implemented below :
271 What we call Zero Cost Exceptions is implemented using the GCC eh
272 circuitry, even if the underlying implementation is setjmp/longjmp
273 based. In any case ...
275 The GCC unwinder expects to be dealing with call return addresses, since
276 this is the "nominal" case of what we retrieve while unwinding a regular
277 call chain. To evaluate if a handler applies at some point in this chain,
278 the propagation engine needs to determine what region the corresponding
279 call instruction pertains to. The return address may not be attached to the
280 same region as the call, so the unwinder unconditionally substracts "some"
281 amount to the return addresses it gets to search the region tables. The
282 exact amount is computed to ensure that the resulting address is inside the
283 call instruction, and is thus target dependant (think about delay slots for
286 When we raise an exception from a signal handler, e.g. to transform a
287 SIGSEGV into Storage_Error, things need to appear as if the signal handler
288 had been "called" by the instruction which triggered the signal, so that
289 exception handlers that apply there are considered. What the unwinder will
290 retrieve as the return address from the signal handler is what it will find
291 as the faulting instruction address in the corresponding signal context
292 pushed by the kernel. Leaving this address untouched may loose, because if
293 the triggering instruction happens to be the very first of a region, the
294 later adjustements performed by the unwinder would yield an address outside
295 that region. We need to compensate for those adjustments at some point,
296 which we currently do in the GCC unwinding fallback macro.
298 The thread at http://gcc.gnu.org/ml/gcc-patches/2004-05/msg00343.html
299 describes a couple of issues with our current approach. Basically: on some
300 targets the adjustment to apply depends on the triggering signal, which is
301 not easily accessible from the macro, and we actually do not tackle this as
302 of today. Besides, other languages, e.g. Java, deal with this by performing
303 the adjustment in the signal handler before the raise, so our adjustments
304 may break those front-ends.
306 To have it all right, we should either find a way to deal with the signal
307 variants from the macro and convert Java on all targets (ugh), or remove
308 our macro adjustments and update our signal handlers a-la-java way. The
309 latter option appears the simplest, although some targets have their share
310 of subtleties to account for. See for instance the syscall(SYS_sigaction)
311 story in libjava/include/i386-signal.h. */
313 /***********************************/
314 /* __gnat_initialize (AIX Version) */
315 /***********************************/
320 #include <sys/time.h>
322 /* Some versions of AIX don't define SA_NODEFER. */
326 #endif /* SA_NODEFER */
328 /* Versions of AIX before 4.3 don't have nanosleep but provide
331 #ifndef _AIXVERSION_430
333 extern int nanosleep (struct timestruc_t *, struct timestruc_t *);
336 nanosleep (struct timestruc_t *Rqtp, struct timestruc_t *Rmtp)
338 return nsleep (Rqtp, Rmtp);
341 #endif /* _AIXVERSION_430 */
343 static void __gnat_error_handler (int);
346 __gnat_error_handler (int sig)
348 struct Exception_Data *exception;
354 /* FIXME: we need to detect the case of a *real* SIGSEGV */
355 exception = &storage_error;
356 msg = "stack overflow or erroneous memory access";
360 exception = &constraint_error;
365 exception = &constraint_error;
370 exception = &program_error;
371 msg = "unhandled signal";
374 Raise_From_Signal_Handler (exception, msg);
378 __gnat_install_handler (void)
380 struct sigaction act;
382 /* Set up signal handler to map synchronous signals to appropriate
383 exceptions. Make sure that the handler isn't interrupted by another
384 signal that might cause a scheduling event! */
386 act.sa_handler = __gnat_error_handler;
387 act.sa_flags = SA_NODEFER | SA_RESTART;
388 sigemptyset (&act.sa_mask);
390 /* Do not install handlers if interrupt state is "System" */
391 if (__gnat_get_interrupt_state (SIGABRT) != 's')
392 sigaction (SIGABRT, &act, NULL);
393 if (__gnat_get_interrupt_state (SIGFPE) != 's')
394 sigaction (SIGFPE, &act, NULL);
395 if (__gnat_get_interrupt_state (SIGILL) != 's')
396 sigaction (SIGILL, &act, NULL);
397 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
398 sigaction (SIGSEGV, &act, NULL);
399 if (__gnat_get_interrupt_state (SIGBUS) != 's')
400 sigaction (SIGBUS, &act, NULL);
402 __gnat_handler_installed = 1;
406 __gnat_initialize (void)
410 /***************************************/
411 /* __gnat_initialize (RTEMS version) */
412 /***************************************/
414 #elif defined(__rtems__)
416 extern void __gnat_install_handler (void);
418 /* For RTEMS, each bsp will provide a custom __gnat_install_handler (). */
421 __gnat_initialize (void)
423 __gnat_install_handler ();
426 /****************************************/
427 /* __gnat_initialize (Dec Unix Version) */
428 /****************************************/
430 #elif defined(__alpha__) && defined(__osf__) && ! defined(__alpha_vxworks)
432 /* Note: it seems that __osf__ is defined for the Alpha VXWorks case. Not
433 clear that this is reasonable, but in any case we have to be sure to
434 exclude this case in the above test. */
437 #include <sys/siginfo.h>
439 static void __gnat_error_handler (int, siginfo_t *, struct sigcontext *);
440 extern char *__gnat_get_code_loc (struct sigcontext *);
441 extern void __gnat_enter_handler (struct sigcontext *, char *);
442 extern size_t __gnat_machine_state_length (void);
444 extern long exc_lookup_gp (char *);
445 extern void exc_resume (struct sigcontext *);
448 __gnat_error_handler (int sig, siginfo_t *sip, struct sigcontext *context)
450 struct Exception_Data *exception;
451 static int recurse = 0;
452 struct sigcontext *mstate;
455 /* If this was an explicit signal from a "kill", just resignal it. */
456 if (SI_FROMUSER (sip))
458 signal (sig, SIG_DFL);
459 kill (getpid(), sig);
462 /* Otherwise, treat it as something we handle. */
466 /* If the problem was permissions, this is a constraint error.
467 Likewise if the failing address isn't maximally aligned or if
470 ??? Using a static variable here isn't task-safe, but it's
471 much too hard to do anything else and we're just determining
472 which exception to raise. */
473 if (sip->si_code == SEGV_ACCERR
474 || (((long) sip->si_addr) & 3) != 0
477 exception = &constraint_error;
482 /* See if the page before the faulting page is accessible. Do that
483 by trying to access it. We'd like to simply try to access
484 4096 + the faulting address, but it's not guaranteed to be
485 the actual address, just to be on the same page. */
488 ((long) sip->si_addr & - getpagesize ()))[getpagesize ()];
489 msg = "stack overflow (or erroneous memory access)";
490 exception = &storage_error;
495 exception = &program_error;
500 exception = &constraint_error;
505 exception = &program_error;
506 msg = "unhandled signal";
510 mstate = (struct sigcontext *) (*Get_Machine_State_Addr) ();
514 Raise_From_Signal_Handler (exception, (char *) msg);
518 __gnat_install_handler (void)
520 struct sigaction act;
522 /* Setup signal handler to map synchronous signals to appropriate
523 exceptions. Make sure that the handler isn't interrupted by another
524 signal that might cause a scheduling event! */
526 act.sa_handler = (void (*) (int)) __gnat_error_handler;
527 act.sa_flags = SA_RESTART | SA_NODEFER | SA_SIGINFO;
528 sigemptyset (&act.sa_mask);
530 /* Do not install handlers if interrupt state is "System" */
531 if (__gnat_get_interrupt_state (SIGABRT) != 's')
532 sigaction (SIGABRT, &act, NULL);
533 if (__gnat_get_interrupt_state (SIGFPE) != 's')
534 sigaction (SIGFPE, &act, NULL);
535 if (__gnat_get_interrupt_state (SIGILL) != 's')
536 sigaction (SIGILL, &act, NULL);
537 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
538 sigaction (SIGSEGV, &act, NULL);
539 if (__gnat_get_interrupt_state (SIGBUS) != 's')
540 sigaction (SIGBUS, &act, NULL);
542 __gnat_handler_installed = 1;
546 __gnat_initialize (void)
550 /* Routines called by 5amastop.adb. */
555 __gnat_get_code_loc (struct sigcontext *context)
557 return (char *) context->sc_pc;
561 __gnat_enter_handler ( struct sigcontext *context, char *pc)
563 context->sc_pc = (long) pc;
564 context->sc_regs[SC_GP] = exc_lookup_gp (pc);
565 exc_resume (context);
569 __gnat_machine_state_length (void)
571 return sizeof (struct sigcontext);
574 /************************************/
575 /* __gnat_initialize (HPUX Version) */
576 /************************************/
578 #elif defined (__hpux__)
582 static void __gnat_error_handler (int);
585 __gnat_error_handler (int sig)
587 struct Exception_Data *exception;
593 /* FIXME: we need to detect the case of a *real* SIGSEGV */
594 exception = &storage_error;
595 msg = "stack overflow or erroneous memory access";
599 exception = &constraint_error;
604 exception = &constraint_error;
609 exception = &program_error;
610 msg = "unhandled signal";
613 Raise_From_Signal_Handler (exception, msg);
617 __gnat_install_handler (void)
619 struct sigaction act;
621 /* Set up signal handler to map synchronous signals to appropriate
622 exceptions. Make sure that the handler isn't interrupted by another
623 signal that might cause a scheduling event! Also setup an alternate
624 stack region for the handler execution so that stack overflows can be
625 handled properly, avoiding a SEGV generation from stack usage by the
628 static char handler_stack[SIGSTKSZ*2];
629 /* SIGSTKSZ appeared to be "short" for the needs in some contexts
630 (e.g. experiments with GCC ZCX exceptions). */
634 stack.ss_sp = handler_stack;
635 stack.ss_size = sizeof (handler_stack);
638 sigaltstack (&stack, NULL);
640 act.sa_handler = __gnat_error_handler;
641 act.sa_flags = SA_NODEFER | SA_RESTART | SA_ONSTACK;
642 sigemptyset (&act.sa_mask);
644 /* Do not install handlers if interrupt state is "System" */
645 if (__gnat_get_interrupt_state (SIGABRT) != 's')
646 sigaction (SIGABRT, &act, NULL);
647 if (__gnat_get_interrupt_state (SIGFPE) != 's')
648 sigaction (SIGFPE, &act, NULL);
649 if (__gnat_get_interrupt_state (SIGILL) != 's')
650 sigaction (SIGILL, &act, NULL);
651 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
652 sigaction (SIGSEGV, &act, NULL);
653 if (__gnat_get_interrupt_state (SIGBUS) != 's')
654 sigaction (SIGBUS, &act, NULL);
656 __gnat_handler_installed = 1;
660 __gnat_initialize (void)
664 /*****************************************/
665 /* __gnat_initialize (GNU/Linux Version) */
666 /*****************************************/
668 #elif defined (linux) && defined (i386) && !defined (__RT__)
671 #include <asm/sigcontext.h>
673 /* GNU/Linux, which uses glibc, does not define NULL in included
677 #define NULL ((void *) 0)
690 static void __gnat_error_handler (int);
693 __gnat_error_handler (int sig)
695 struct Exception_Data *exception;
697 static int recurse = 0;
699 struct sigcontext *info
700 = (struct sigcontext *) (((char *) &sig) + sizeof (int));
702 /* The Linux kernel does not document how to get the machine state in a
703 signal handler, but in fact the necessary data is in a sigcontext_struct
704 value that is on the stack immediately above the signal number
705 parameter, and the above messing accesses this value on the stack. */
707 struct Machine_State *mstate;
712 /* If the problem was permissions, this is a constraint error.
713 Likewise if the failing address isn't maximally aligned or if
716 ??? Using a static variable here isn't task-safe, but it's
717 much too hard to do anything else and we're just determining
718 which exception to raise. */
721 exception = &constraint_error;
726 /* Here we would like a discrimination test to see whether the
727 page before the faulting address is accessible. Unfortunately
728 Linux seems to have no way of giving us the faulting address.
730 In versions of a-init.c before 1.95, we had a test of the page
731 before the stack pointer using:
735 ((long) info->esp_at_signal & - getpagesize ()))[getpagesize ()];
737 but that's wrong, since it tests the stack pointer location, and
738 the current stack probe code does not move the stack pointer
739 until all probes succeed.
741 For now we simply do not attempt any discrimination at all. Note
742 that this is quite acceptable, since a "real" SIGSEGV can only
743 occur as the result of an erroneous program */
745 msg = "stack overflow (or erroneous memory access)";
746 exception = &storage_error;
751 exception = &constraint_error;
756 exception = &constraint_error;
761 exception = &program_error;
762 msg = "unhandled signal";
765 mstate = (*Get_Machine_State_Addr) ();
768 mstate->eip = info->eip;
769 mstate->ebx = info->ebx;
770 mstate->esp = info->esp_at_signal;
771 mstate->ebp = info->ebp;
772 mstate->esi = info->esi;
773 mstate->edi = info->edi;
777 Raise_From_Signal_Handler (exception, msg);
781 __gnat_install_handler (void)
783 struct sigaction act;
785 /* Set up signal handler to map synchronous signals to appropriate
786 exceptions. Make sure that the handler isn't interrupted by another
787 signal that might cause a scheduling event! */
789 act.sa_handler = __gnat_error_handler;
790 act.sa_flags = SA_NODEFER | SA_RESTART;
791 sigemptyset (&act.sa_mask);
793 /* Do not install handlers if interrupt state is "System" */
794 if (__gnat_get_interrupt_state (SIGABRT) != 's')
795 sigaction (SIGABRT, &act, NULL);
796 if (__gnat_get_interrupt_state (SIGFPE) != 's')
797 sigaction (SIGFPE, &act, NULL);
798 if (__gnat_get_interrupt_state (SIGILL) != 's')
799 sigaction (SIGILL, &act, NULL);
800 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
801 sigaction (SIGSEGV, &act, NULL);
802 if (__gnat_get_interrupt_state (SIGBUS) != 's')
803 sigaction (SIGBUS, &act, NULL);
805 __gnat_handler_installed = 1;
809 __gnat_initialize (void)
813 /******************************************/
814 /* __gnat_initialize (NT-mingw32 Version) */
815 /******************************************/
817 #elif defined (__MINGW32__)
820 static LONG WINAPI __gnat_error_handler (PEXCEPTION_POINTERS);
822 /* __gnat_initialize (mingw32). */
825 __gnat_error_handler (PEXCEPTION_POINTERS info)
827 struct Exception_Data *exception;
830 switch (info->ExceptionRecord->ExceptionCode)
832 case EXCEPTION_ACCESS_VIOLATION:
833 /* If the failing address isn't maximally-aligned or if the page
834 before the faulting page is not accessible, this is a program error.
836 if ((info->ExceptionRecord->ExceptionInformation[1] & 3) != 0
838 ((void *)(info->ExceptionRecord->ExceptionInformation[1] + 4096)))
840 exception = &program_error;
841 msg = "EXCEPTION_ACCESS_VIOLATION";
845 /* otherwise it is a stack overflow */
846 exception = &storage_error;
847 msg = "stack overflow (or erroneous memory access)";
851 case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
852 exception = &constraint_error;
853 msg = "EXCEPTION_ARRAY_BOUNDS_EXCEEDED";
856 case EXCEPTION_DATATYPE_MISALIGNMENT:
857 exception = &constraint_error;
858 msg = "EXCEPTION_DATATYPE_MISALIGNMENT";
861 case EXCEPTION_FLT_DENORMAL_OPERAND:
862 exception = &constraint_error;
863 msg = "EXCEPTION_FLT_DENORMAL_OPERAND";
866 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
867 exception = &constraint_error;
868 msg = "EXCEPTION_FLT_DENORMAL_OPERAND";
871 case EXCEPTION_FLT_INVALID_OPERATION:
872 exception = &constraint_error;
873 msg = "EXCEPTION_FLT_INVALID_OPERATION";
876 case EXCEPTION_FLT_OVERFLOW:
877 exception = &constraint_error;
878 msg = "EXCEPTION_FLT_OVERFLOW";
881 case EXCEPTION_FLT_STACK_CHECK:
882 exception = &program_error;
883 msg = "EXCEPTION_FLT_STACK_CHECK";
886 case EXCEPTION_FLT_UNDERFLOW:
887 exception = &constraint_error;
888 msg = "EXCEPTION_FLT_UNDERFLOW";
891 case EXCEPTION_INT_DIVIDE_BY_ZERO:
892 exception = &constraint_error;
893 msg = "EXCEPTION_INT_DIVIDE_BY_ZERO";
896 case EXCEPTION_INT_OVERFLOW:
897 exception = &constraint_error;
898 msg = "EXCEPTION_INT_OVERFLOW";
901 case EXCEPTION_INVALID_DISPOSITION:
902 exception = &program_error;
903 msg = "EXCEPTION_INVALID_DISPOSITION";
906 case EXCEPTION_NONCONTINUABLE_EXCEPTION:
907 exception = &program_error;
908 msg = "EXCEPTION_NONCONTINUABLE_EXCEPTION";
911 case EXCEPTION_PRIV_INSTRUCTION:
912 exception = &program_error;
913 msg = "EXCEPTION_PRIV_INSTRUCTION";
916 case EXCEPTION_SINGLE_STEP:
917 exception = &program_error;
918 msg = "EXCEPTION_SINGLE_STEP";
921 case EXCEPTION_STACK_OVERFLOW:
922 exception = &storage_error;
923 msg = "EXCEPTION_STACK_OVERFLOW";
927 exception = &program_error;
928 msg = "unhandled signal";
931 Raise_From_Signal_Handler (exception, msg);
932 return 0; /* This is never reached, avoid compiler warning */
936 __gnat_install_handler (void)
938 SetUnhandledExceptionFilter (__gnat_error_handler);
939 __gnat_handler_installed = 1;
943 __gnat_initialize (void)
946 /* Initialize floating-point coprocessor. This call is needed because
947 the MS libraries default to 64-bit precision instead of 80-bit
948 precision, and we require the full precision for proper operation,
949 given that we have set Max_Digits etc with this in mind */
951 __gnat_init_float ();
953 /* initialize a lock for a process handle list - see a-adaint.c for the
954 implementation of __gnat_portable_no_block_spawn, __gnat_portable_wait */
958 /***************************************/
959 /* __gnat_initialize (Interix Version) */
960 /***************************************/
962 #elif defined (__INTERIX)
966 static void __gnat_error_handler (int);
969 __gnat_error_handler (int sig)
971 struct Exception_Data *exception;
977 exception = &storage_error;
978 msg = "stack overflow or erroneous memory access";
982 exception = &constraint_error;
987 exception = &constraint_error;
992 exception = &program_error;
993 msg = "unhandled signal";
996 Raise_From_Signal_Handler (exception, msg);
1000 __gnat_install_handler (void)
1002 struct sigaction act;
1004 /* Set up signal handler to map synchronous signals to appropriate
1005 exceptions. Make sure that the handler isn't interrupted by another
1006 signal that might cause a scheduling event! */
1008 act.sa_handler = __gnat_error_handler;
1010 sigemptyset (&act.sa_mask);
1012 /* Handlers for signals besides SIGSEGV cause c974013 to hang */
1013 /* sigaction (SIGILL, &act, NULL); */
1014 /* sigaction (SIGABRT, &act, NULL); */
1015 /* sigaction (SIGFPE, &act, NULL); */
1016 /* sigaction (SIGBUS, &act, NULL); */
1018 /* Do not install handlers if interrupt state is "System" */
1019 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
1020 sigaction (SIGSEGV, &act, NULL);
1022 __gnat_handler_installed = 1;
1026 __gnat_initialize (void)
1028 __gnat_init_float ();
1031 /**************************************/
1032 /* __gnat_initialize (LynxOS Version) */
1033 /**************************************/
1035 #elif defined (__Lynx__)
1038 __gnat_initialize (void)
1040 __gnat_init_float ();
1043 /*********************************/
1044 /* __gnat_install_handler (Lynx) */
1045 /*********************************/
1048 __gnat_install_handler (void)
1050 __gnat_handler_installed = 1;
1053 /****************************/
1054 /* __gnat_initialize (OS/2) */
1055 /****************************/
1057 #elif defined (__EMX__) /* OS/2 dependent initialization */
1060 __gnat_initialize (void)
1064 /*********************************/
1065 /* __gnat_install_handler (OS/2) */
1066 /*********************************/
1069 __gnat_install_handler (void)
1071 __gnat_handler_installed = 1;
1074 /***********************************/
1075 /* __gnat_initialize (SGI Version) */
1076 /***********************************/
1081 #include <siginfo.h>
1087 #define SIGADAABORT 48
1088 #define SIGNAL_STACK_SIZE 4096
1089 #define SIGNAL_STACK_ALIGNMENT 64
1091 struct Machine_State
1093 sigcontext_t context;
1096 static void __gnat_error_handler (int, int, sigcontext_t *);
1098 /* We are not setting the SA_SIGINFO bit in the sigaction flags when
1099 connecting that handler, with the effects described in the sigaction
1103 If cleared and the signal is caught, the first argument is
1104 also the signal number but the second argument is the signal
1105 code identifying the cause of the signal. The third argument
1106 points to a sigcontext_t structure containing the receiving
1107 process's context when the signal was delivered.
1111 __gnat_error_handler (int sig, int code, sigcontext_t *sc)
1113 struct Machine_State *mstate;
1114 struct Exception_Data *exception;
1122 exception = &program_error;
1123 msg = "SIGSEGV: (Invalid virtual address)";
1125 else if (code == ENXIO)
1127 exception = &program_error;
1128 msg = "SIGSEGV: (Read beyond mapped object)";
1130 else if (code == ENOSPC)
1132 exception = &program_error; /* ??? storage_error ??? */
1133 msg = "SIGSEGV: (Autogrow for file failed)";
1135 else if (code == EACCES || code == EEXIST)
1137 /* ??? We handle stack overflows here, some of which do trigger
1138 SIGSEGV + EEXIST on Irix 6.5 although EEXIST is not part of
1139 the documented valid codes for SEGV in the signal(5) man
1142 /* ??? Re-add smarts to further verify that we launched
1143 the stack into a guard page, not an attempt to
1144 write to .text or something */
1145 exception = &storage_error;
1146 msg = "SIGSEGV: (stack overflow or erroneous memory access)";
1150 /* Just in case the OS guys did it to us again. Sometimes
1151 they fail to document all of the valid codes that are
1152 passed to signal handlers, just in case someone depends
1153 on knowing all the codes */
1154 exception = &program_error;
1155 msg = "SIGSEGV: (Undocumented reason)";
1160 /* Map all bus errors to Program_Error. */
1161 exception = &program_error;
1166 /* Map all fpe errors to Constraint_Error. */
1167 exception = &constraint_error;
1172 if ((*Check_Abort_Status) ())
1174 exception = &_abort_signal;
1183 /* Everything else is a Program_Error. */
1184 exception = &program_error;
1185 msg = "unhandled signal";
1188 mstate = (*Get_Machine_State_Addr) ();
1190 memcpy ((void *) mstate, (const void *) sc, sizeof (sigcontext_t));
1192 Raise_From_Signal_Handler (exception, msg);
1196 __gnat_install_handler (void)
1198 struct sigaction act;
1200 /* Setup signal handler to map synchronous signals to appropriate
1201 exceptions. Make sure that the handler isn't interrupted by another
1202 signal that might cause a scheduling event! */
1204 act.sa_handler = __gnat_error_handler;
1205 act.sa_flags = SA_NODEFER + SA_RESTART;
1206 sigfillset (&act.sa_mask);
1207 sigemptyset (&act.sa_mask);
1209 /* Do not install handlers if interrupt state is "System" */
1210 if (__gnat_get_interrupt_state (SIGABRT) != 's')
1211 sigaction (SIGABRT, &act, NULL);
1212 if (__gnat_get_interrupt_state (SIGFPE) != 's')
1213 sigaction (SIGFPE, &act, NULL);
1214 if (__gnat_get_interrupt_state (SIGILL) != 's')
1215 sigaction (SIGILL, &act, NULL);
1216 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
1217 sigaction (SIGSEGV, &act, NULL);
1218 if (__gnat_get_interrupt_state (SIGBUS) != 's')
1219 sigaction (SIGBUS, &act, NULL);
1220 if (__gnat_get_interrupt_state (SIGADAABORT) != 's')
1221 sigaction (SIGADAABORT, &act, NULL);
1223 __gnat_handler_installed = 1;
1227 __gnat_initialize (void)
1231 /*************************************************/
1232 /* __gnat_initialize (Solaris and SunOS Version) */
1233 /*************************************************/
1235 #elif defined (sun) && defined (__SVR4) && !defined (__vxworks)
1238 #include <siginfo.h>
1240 static void __gnat_error_handler (int, siginfo_t *);
1243 __gnat_error_handler (int sig, siginfo_t *sip)
1245 struct Exception_Data *exception;
1246 static int recurse = 0;
1249 /* If this was an explicit signal from a "kill", just resignal it. */
1250 if (SI_FROMUSER (sip))
1252 signal (sig, SIG_DFL);
1253 kill (getpid(), sig);
1256 /* Otherwise, treat it as something we handle. */
1260 /* If the problem was permissions, this is a constraint error.
1261 Likewise if the failing address isn't maximally aligned or if
1264 ??? Using a static variable here isn't task-safe, but it's
1265 much too hard to do anything else and we're just determining
1266 which exception to raise. */
1267 if (sip->si_code == SEGV_ACCERR
1268 || (((long) sip->si_addr) & 3) != 0
1271 exception = &constraint_error;
1276 /* See if the page before the faulting page is accessible. Do that
1277 by trying to access it. We'd like to simply try to access
1278 4096 + the faulting address, but it's not guaranteed to be
1279 the actual address, just to be on the same page. */
1282 ((long) sip->si_addr & - getpagesize ()))[getpagesize ()];
1283 exception = &storage_error;
1284 msg = "stack overflow (or erroneous memory access)";
1289 exception = &program_error;
1294 exception = &constraint_error;
1299 exception = &program_error;
1300 msg = "unhandled signal";
1305 Raise_From_Signal_Handler (exception, msg);
1309 __gnat_install_handler (void)
1311 struct sigaction act;
1313 /* Set up signal handler to map synchronous signals to appropriate
1314 exceptions. Make sure that the handler isn't interrupted by another
1315 signal that might cause a scheduling event! */
1317 act.sa_handler = __gnat_error_handler;
1318 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
1319 sigemptyset (&act.sa_mask);
1321 /* Do not install handlers if interrupt state is "System" */
1322 if (__gnat_get_interrupt_state (SIGABRT) != 's')
1323 sigaction (SIGABRT, &act, NULL);
1324 if (__gnat_get_interrupt_state (SIGFPE) != 's')
1325 sigaction (SIGFPE, &act, NULL);
1326 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
1327 sigaction (SIGSEGV, &act, NULL);
1328 if (__gnat_get_interrupt_state (SIGBUS) != 's')
1329 sigaction (SIGBUS, &act, NULL);
1331 __gnat_handler_installed = 1;
1335 __gnat_initialize (void)
1339 /***********************************/
1340 /* __gnat_initialize (VMS Version) */
1341 /***********************************/
1346 #define lib_get_curr_invo_context LIB$I64_GET_CURR_INVO_CONTEXT
1347 #define lib_get_prev_invo_context LIB$I64_GET_PREV_INVO_CONTEXT
1348 #define lib_get_invo_handle LIB$I64_GET_INVO_HANDLE
1350 #define lib_get_curr_invo_context LIB$GET_CURR_INVO_CONTEXT
1351 #define lib_get_prev_invo_context LIB$GET_PREV_INVO_CONTEXT
1352 #define lib_get_invo_handle LIB$GET_INVO_HANDLE
1355 #if defined (IN_RTS) && !defined (__IA64)
1357 /* The prehandler actually gets control first on a condition. It swaps the
1358 stack pointer and calls the handler (__gnat_error_handler). */
1359 extern long __gnat_error_prehandler (void);
1361 extern char *__gnat_error_prehandler_stack; /* Alternate signal stack */
1364 /* Conditions that don't have an Ada exception counterpart must raise
1365 Non_Ada_Error. Since this is defined in s-auxdec, it should only be
1366 referenced by user programs, not the compiler or tools. Hence the
1370 #define Non_Ada_Error system__aux_dec__non_ada_error
1371 extern struct Exception_Data Non_Ada_Error;
1373 #define Coded_Exception system__vms_exception_table__coded_exception
1374 extern struct Exception_Data *Coded_Exception (Exception_Code);
1376 #define Base_Code_In system__vms_exception_table__base_code_in
1377 extern Exception_Code Base_Code_In (Exception_Code);
1380 /* Define macro symbols for the VMS conditions that become Ada exceptions.
1381 Most of these are also defined in the header file ssdef.h which has not
1382 yet been converted to be recoginized by Gnu C. Some, which couldn't be
1383 located, are assigned names based on the DEC test suite tests which
1386 #define SS$_ACCVIO 12
1387 #define SS$_DEBUG 1132
1388 #define SS$_INTDIV 1156
1389 #define SS$_HPARITH 1284
1390 #define SS$_STKOVF 1364
1391 #define SS$_RESIGNAL 2328
1392 #define MTH$_FLOOVEMAT 1475268 /* Some ACVC_21 CXA tests */
1393 #define SS$_CE24VRU 3253636 /* Write to unopened file */
1394 #define SS$_C980VTE 3246436 /* AST requests time slice */
1395 #define CMA$_EXIT_THREAD 4227492
1396 #define CMA$_EXCCOPLOS 4228108
1397 #define CMA$_ALERTED 4227460
1399 struct descriptor_s {unsigned short len, mbz; char *adr; };
1401 long __gnat_error_handler (int *, void *);
1404 __gnat_error_handler (int *sigargs, void *mechargs)
1406 struct Exception_Data *exception = 0;
1407 Exception_Code base_code;
1412 struct descriptor_s msgdesc;
1413 int msg_flag = 0x000f; /* 1 bit for each of the four message parts */
1414 unsigned short outlen;
1416 long curr_invo_handle;
1419 /* Resignaled condtions aren't effected by by pragma Import_Exception */
1424 case CMA$_EXIT_THREAD:
1425 return SS$_RESIGNAL;
1427 case SS$_DEBUG: /* Gdb attach, resignal to merge activate gdbstub. */
1428 return SS$_RESIGNAL;
1430 case 1409786: /* Nickerson bug #33 ??? */
1431 return SS$_RESIGNAL;
1433 case 1381050: /* Nickerson bug #33 ??? */
1434 return SS$_RESIGNAL;
1436 case 20480426: /* RDB-E-STREAM_EOF */
1437 return SS$_RESIGNAL;
1439 case 11829410: /* Resignalled as Use_Error for CE10VRC */
1440 return SS$_RESIGNAL;
1445 /* See if it's an imported exception. Beware that registered exceptions
1446 are bound to their base code, with the severity bits masked off. */
1447 base_code = Base_Code_In ((Exception_Code) sigargs [1]);
1448 exception = Coded_Exception (base_code);
1454 msgdesc.adr = message;
1455 SYS$GETMSG (sigargs[1], &outlen, &msgdesc, msg_flag, 0);
1456 message[outlen] = 0;
1459 exception->Name_Length = 19;
1460 /* The full name really should be get sys$getmsg returns. ??? */
1461 exception->Full_Name = "IMPORTED_EXCEPTION";
1462 exception->Import_Code = base_code;
1470 if (sigargs[3] == 0)
1472 exception = &constraint_error;
1473 msg = "access zero";
1477 exception = &storage_error;
1478 msg = "stack overflow (or erroneous memory access)";
1483 exception = &storage_error;
1484 msg = "stack overflow";
1488 exception = &constraint_error;
1489 msg = "division by zero";
1494 return SS$_RESIGNAL; /* toplev.c handles for compiler */
1497 exception = &constraint_error;
1498 msg = "arithmetic error";
1503 case MTH$_FLOOVEMAT:
1504 exception = &constraint_error;
1505 msg = "floating overflow in math library";
1509 exception = &constraint_error;
1514 exception = &program_error;
1520 exception = &program_error;
1522 /* User programs expect Non_Ada_Error to be raised, reference
1523 DEC Ada test CXCONDHAN. */
1524 exception = &Non_Ada_Error;
1528 msgdesc.adr = message;
1529 SYS$GETMSG (sigargs[1], &outlen, &msgdesc, msg_flag, 0);
1530 message[outlen] = 0;
1535 mstate = (long *) (*Get_Machine_State_Addr) ();
1538 lib_get_curr_invo_context (&curr_icb);
1539 lib_get_prev_invo_context (&curr_icb);
1540 lib_get_prev_invo_context (&curr_icb);
1541 curr_invo_handle = lib_get_invo_handle (&curr_icb);
1542 *mstate = curr_invo_handle;
1544 Raise_From_Signal_Handler (exception, msg);
1548 __gnat_install_handler (void)
1551 #if defined (IN_RTS) && !defined (__IA64)
1554 c = (char *) xmalloc (2049);
1556 __gnat_error_prehandler_stack = &c[2048];
1558 /* __gnat_error_prehandler is an assembly function. */
1559 SYS$SETEXV (1, __gnat_error_prehandler, 3, &prvhnd);
1561 SYS$SETEXV (1, __gnat_error_handler, 3, &prvhnd);
1563 __gnat_handler_installed = 1;
1567 __gnat_initialize(void)
1571 /*************************************************/
1572 /* __gnat_initialize (FreeBSD version) */
1573 /*************************************************/
1575 #elif defined (__FreeBSD__)
1581 __gnat_error_handler (sig, code, sc)
1584 struct sigcontext *sc;
1586 struct Exception_Data *exception;
1592 exception = &constraint_error;
1597 exception = &constraint_error;
1602 exception = &storage_error;
1603 msg = "stack overflow or erroneous memory access";
1607 exception = &constraint_error;
1612 exception = &program_error;
1613 msg = "unhandled signal";
1616 Raise_From_Signal_Handler (exception, msg);
1620 __gnat_install_handler ()
1622 struct sigaction act;
1624 /* Set up signal handler to map synchronous signals to appropriate
1625 exceptions. Make sure that the handler isn't interrupted by another
1626 signal that might cause a scheduling event! */
1628 act.sa_handler = __gnat_error_handler;
1629 act.sa_flags = SA_NODEFER | SA_RESTART;
1630 (void) sigemptyset (&act.sa_mask);
1632 (void) sigaction (SIGILL, &act, NULL);
1633 (void) sigaction (SIGFPE, &act, NULL);
1634 (void) sigaction (SIGSEGV, &act, NULL);
1635 (void) sigaction (SIGBUS, &act, NULL);
1638 void __gnat_init_float ();
1641 __gnat_initialize ()
1643 __gnat_install_handler ();
1645 /* XXX - Initialize floating-point coprocessor. This call is
1646 needed because FreeBSD defaults to 64-bit precision instead
1647 of 80-bit precision? We require the full precision for
1648 proper operation, given that we have set Max_Digits etc
1649 with this in mind */
1650 __gnat_init_float ();
1653 /***************************************/
1654 /* __gnat_initialize (VXWorks Version) */
1655 /***************************************/
1657 #elif defined(__vxworks)
1660 #include <taskLib.h>
1664 extern int __gnat_inum_to_ivec (int);
1665 static void __gnat_error_handler (int, int, struct sigcontext *);
1666 void __gnat_map_signal (int);
1668 #ifndef __alpha_vxworks
1670 /* getpid is used by s-parint.adb, but is not defined by VxWorks, except
1673 extern long getpid (void);
1678 return taskIdSelf ();
1682 /* This is needed by the GNAT run time to handle Vxworks interrupts */
1684 __gnat_inum_to_ivec (int num)
1686 return INUM_TO_IVEC (num);
1689 /* Exported to 5zintman.adb in order to handle different signal
1690 to exception mappings in different VxWorks versions */
1692 __gnat_map_signal (int sig)
1694 struct Exception_Data *exception;
1700 exception = &constraint_error;
1704 exception = &constraint_error;
1709 exception = &storage_error;
1710 msg = "SIGSEGV: possible stack overflow";
1713 exception = &storage_error;
1714 msg = "SIGBUS: possible stack overflow";
1718 exception = &program_error;
1722 exception = &program_error;
1727 exception = &program_error;
1728 msg = "unhandled signal";
1731 Raise_From_Signal_Handler (exception, msg);
1735 __gnat_error_handler (int sig, int code, struct sigcontext *sc)
1740 /* VxWorks will always mask out the signal during the signal handler and
1741 will reenable it on a longjmp. GNAT does not generate a longjmp to
1742 return from a signal handler so the signal will still be masked unless
1744 sigprocmask (SIG_SETMASK, NULL, &mask);
1745 sigdelset (&mask, sig);
1746 sigprocmask (SIG_SETMASK, &mask, NULL);
1748 /* VxWorks will suspend the task when it gets a hardware exception. We
1749 take the liberty of resuming the task for the application. */
1750 if (taskIsSuspended (taskIdSelf ()) != 0)
1751 taskResume (taskIdSelf ());
1753 __gnat_map_signal (sig);
1758 __gnat_install_handler (void)
1760 struct sigaction act;
1762 /* Setup signal handler to map synchronous signals to appropriate
1763 exceptions. Make sure that the handler isn't interrupted by another
1764 signal that might cause a scheduling event! */
1766 act.sa_handler = __gnat_error_handler;
1767 act.sa_flags = SA_SIGINFO | SA_ONSTACK;
1768 sigemptyset (&act.sa_mask);
1770 /* For VxWorks, install all signal handlers, since pragma Interrupt_State
1771 applies to vectored hardware interrupts, not signals */
1772 sigaction (SIGFPE, &act, NULL);
1773 sigaction (SIGILL, &act, NULL);
1774 sigaction (SIGSEGV, &act, NULL);
1775 sigaction (SIGBUS, &act, NULL);
1777 __gnat_handler_installed = 1;
1780 #define HAVE_GNAT_INIT_FLOAT
1783 __gnat_init_float (void)
1785 /* Disable overflow/underflow exceptions on the PPC processor, this is needed
1786 to get correct Ada semantics. Note that for AE653 vThreads, the HW
1787 overflow settings are an OS configuration issue. The instructions
1788 below have no effect */
1789 #if defined (_ARCH_PPC) && !defined (_SOFT_FLOAT) && !defined (VTHREADS)
1794 /* Similarily for sparc64. Achieved by masking bits in the Trap Enable Mask
1795 field of the Floating-point Status Register (see the Sparc Architecture
1796 Manual Version 9, p 48). */
1797 #if defined (sparc64)
1799 #define FSR_TEM_NVM (1 << 27) /* Invalid operand */
1800 #define FSR_TEM_OFM (1 << 26) /* Overflow */
1801 #define FSR_TEM_UFM (1 << 25) /* Underflow */
1802 #define FSR_TEM_DZM (1 << 24) /* Division by Zero */
1803 #define FSR_TEM_NXM (1 << 23) /* Inexact result */
1807 __asm__("st %%fsr, %0" : "=m" (fsr));
1808 fsr &= ~(FSR_TEM_OFM | FSR_TEM_UFM);
1809 __asm__("ld %0, %%fsr" : : "m" (fsr));
1815 __gnat_initialize (void)
1817 __gnat_init_float ();
1819 /* On targets where we might be using the ZCX scheme, we need to register
1822 For applications loaded as a set of "modules", the crtstuff objects
1823 linked in (crtbegin/endS) are tailored to provide this service a-la C++
1824 static constructor fashion, typically triggered by the VxWorks loader.
1825 This is achieved by way of a special variable declaration in the crt
1826 object, the name of which has been deduced by analyzing the output of the
1827 "munching" step documented for C++. The de-registration call is handled
1828 symetrically, a-la C++ destructor fashion and typically triggered by the
1829 dynamic unloader. Note that since the tables shall be registered against
1830 a common datastructure, libgcc should be one of the modules (vs beeing
1831 partially linked against all the others at build time) and shall be
1834 For applications linked with the kernel, the scheme above would lead to
1835 duplicated symbols because the VxWorks kernel build "munches" by default.
1836 To prevent those conflicts, we link against crtbegin/end objects that
1837 don't include the special variable and directly call the appropriate
1838 function here. We'll never unload that, so there is no de-registration to
1841 For whole applications loaded as a single module, we may use one scheme
1842 or the other, except for the mixed Ada/C++ case in which the first scheme
1843 would fail for the same reason as in the linked-with-kernel situation.
1845 We can differentiate by looking at the __module_has_ctors value provided
1846 by each class of crt objects. As of today, selecting the crt set with the
1847 static ctors/dtors capabilities (first scheme above) is triggered by
1848 adding "-static" to the gcc *link* command line options. Without this,
1849 the other set of crt objects is fetched.
1851 This is a first approach, tightly synchronized with a number of GCC
1852 configuration and crtstuff changes. We need to ensure that those changes
1853 are there to activate this circuitry. */
1855 #if DWARF2_UNWIND_INFO && defined (_ARCH_PPC)
1857 /* The scheme described above is only useful for the actual ZCX case, and
1858 we don't want any reference to the crt provided symbols otherwise. We
1859 may not link with any of the crt objects in the non-ZCX case, e.g. from
1860 documented procedures instructing the use of -nostdlib, and references
1861 to the ctors symbols here would just remain unsatisfied.
1863 We have no way to avoid those references in the right conditions in this
1864 C module, because we have nothing like a IN_ZCX_RTS macro. This aspect
1865 is then deferred to an Ada routine, which can do that based on a test
1866 against a constant System flag value. */
1868 extern void __gnat_vxw_setup_for_eh (void);
1869 __gnat_vxw_setup_for_eh ();
1874 /********************************/
1875 /* __gnat_initialize for NetBSD */
1876 /********************************/
1878 #elif defined(__NetBSD__)
1884 __gnat_error_handler (int sig)
1886 struct Exception_Data *exception;
1892 exception = &constraint_error;
1896 exception = &constraint_error;
1900 exception = &storage_error;
1901 msg = "stack overflow or erroneous memory access";
1904 exception = &constraint_error;
1908 exception = &program_error;
1909 msg = "unhandled signal";
1912 Raise_From_Signal_Handler(exception, msg);
1916 __gnat_install_handler(void)
1918 struct sigaction act;
1920 act.sa_handler = __gnat_error_handler;
1921 act.sa_flags = SA_NODEFER | SA_RESTART;
1922 sigemptyset (&act.sa_mask);
1924 /* Do not install handlers if interrupt state is "System" */
1925 if (__gnat_get_interrupt_state (SIGFPE) != 's')
1926 sigaction (SIGFPE, &act, NULL);
1927 if (__gnat_get_interrupt_state (SIGILL) != 's')
1928 sigaction (SIGILL, &act, NULL);
1929 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
1930 sigaction (SIGSEGV, &act, NULL);
1931 if (__gnat_get_interrupt_state (SIGBUS) != 's')
1932 sigaction (SIGBUS, &act, NULL);
1934 __gnat_handler_installed = 1;
1938 __gnat_initialize (void)
1940 __gnat_install_handler ();
1941 __gnat_init_float ();
1946 /* For all other versions of GNAT, the initialize routine and handler
1947 installation do nothing */
1949 /***************************************/
1950 /* __gnat_initialize (Default Version) */
1951 /***************************************/
1954 __gnat_initialize (void)
1958 /********************************************/
1959 /* __gnat_install_handler (Default Version) */
1960 /********************************************/
1963 __gnat_install_handler (void)
1965 __gnat_handler_installed = 1;
1970 /*********************/
1971 /* __gnat_init_float */
1972 /*********************/
1974 /* This routine is called as each process thread is created, for possible
1975 initialization of the FP processor. This version is used under INTERIX,
1976 WIN32 and could be used under OS/2 */
1978 #if defined (_WIN32) || defined (__INTERIX) || defined (__EMX__) \
1979 || defined (__Lynx__) || defined(__NetBSD__) || defined(__FreeBSD__)
1981 #define HAVE_GNAT_INIT_FLOAT
1984 __gnat_init_float (void)
1986 #if defined (__i386__) || defined (i386)
1988 /* This is used to properly initialize the FPU on an x86 for each
1993 #endif /* Defined __i386__ */
1997 #ifndef HAVE_GNAT_INIT_FLOAT
1999 /* All targets without a specific __gnat_init_float will use an empty one */
2001 __gnat_init_float (void)