/****************************************************************************/ /* */ /* GNAT COMPILER COMPONENTS */ /* */ /* A - I N I T */ /* */ /* $Revision: 1.166 $ /* */ /* C Implementation File */ /* */ /* Copyright (C) 1992-2000 Free Software Foundation, Inc. */ /* */ /* GNAT is free software; you can redistribute it and/or modify it under */ /* terms of the GNU General Public License as published by the Free Soft- */ /* ware Foundation; either version 2, or (at your option) any later ver- */ /* sion. GNAT is distributed in the hope that it will be useful, but WITH- */ /* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY */ /* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License */ /* for more details. You should have received a copy of the GNU General */ /* Public License distributed with GNAT; see file COPYING. If not, write */ /* to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, */ /* MA 02111-1307, USA. */ /* */ /* As a special exception, if you link this file with other files to */ /* produce an executable, this file does not by itself cause the resulting */ /* executable to be covered by the GNU General Public License. This except- */ /* ion does not however invalidate any other reasons why the executable */ /* file might be covered by the GNU Public License. */ /* */ /* GNAT was originally developed by the GNAT team at New York University. */ /* It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). */ /* */ /****************************************************************************/ /* This unit contains initialization circuits that are system dependent. A major part of the functionality involved involves stack overflow checking. The GCC backend generates probe instructions to test for stack overflow. For details on the exact approach used to generate these probes, see the "Using and Porting GCC" manual, in particular the "Stack Checking" section and the subsection "Specifying How Stack Checking is Done". The handlers installed by this file are used to handle resulting signals that come from these probes failing (i.e. touching protected pages) */ /* The following include is here to meet the published VxWorks requirement that the __vxworks header appear before any other include. */ #ifdef __vxworks #include "vxWorks.h" #endif #include "config.h" #include "a-ada.h" #include "a-raise.h" #include /* Addresses of exception data blocks for predefined exceptions. */ extern struct Exception_Data constraint_error; extern struct Exception_Data numeric_error; extern struct Exception_Data program_error; extern struct Exception_Data storage_error; extern struct Exception_Data tasking_error; extern struct Exception_Data _abort_signal; #define Lock_Task system__soft_links__lock_task extern void (*Lock_Task) (void); #define Unlock_Task system__soft_links__unlock_task extern void (*Unlock_Task) (void); #define Get_Machine_State_Addr \ system__soft_links__get_machine_state_addr extern struct Machine_State *(*Get_Machine_State_Addr) (void); #define Check_Abort_Status \ system__soft_links__check_abort_status extern int (*Check_Abort_Status) (void); #define Raise_From_Signal_Handler \ ada__exceptions__raise_from_signal_handler extern void Raise_From_Signal_Handler (struct Exception_Data *, char *); #define Propagate_Signal_Exception \ __gnat_propagate_sig_exc extern void Propagate_Signal_Exception (struct Machine_State *, struct Exception_Data *, char *); /* Copies of global values computed by the binder */ int __gl_main_priority = -1; int __gl_time_slice_val = -1; char __gl_wc_encoding = 'n'; char __gl_locking_policy = ' '; char __gl_queuing_policy = ' '; char __gl_task_dispatching_policy = ' '; void (*__gl_adafinal_ptr) () = 0; int __gl_unreserve_all_interrupts = 0; int __gl_exception_tracebacks = 0; /* HAVE_GNAT_INIT_FLOAT must be set on every targets where a __gnat_init_float is defined. If this is not set them a void implementation will be defined at the end of this unit. */ #undef HAVE_GNAT_INIT_FLOAT /**********************/ /* __gnat_set_globals */ /**********************/ /* This routine is called from the binder generated main program. It copies the values for global quantities computed by the binder into the following global locations. The reason that we go through this copy, rather than just define the global locations in the binder generated file, is that they are referenced from the runtime, which may be in a shared library, and the binder file is not in the shared library. Global references across library boundaries like this are not handled correctly in all systems. */ void __gnat_set_globals (main_priority, time_slice_val, wc_encoding, locking_policy, queuing_policy, task_dispatching_policy, adafinal_ptr, unreserve_all_interrupts, exception_tracebacks) int main_priority; int time_slice_val; char wc_encoding; char locking_policy, queuing_policy, task_dispatching_policy; void (*adafinal_ptr) (); int unreserve_all_interrupts, exception_tracebacks; { __gl_main_priority = main_priority; __gl_time_slice_val = time_slice_val; __gl_wc_encoding = wc_encoding; __gl_locking_policy = locking_policy; __gl_queuing_policy = queuing_policy; __gl_task_dispatching_policy = task_dispatching_policy; __gl_adafinal_ptr = adafinal_ptr; __gl_unreserve_all_interrupts = unreserve_all_interrupts; __gl_exception_tracebacks = exception_tracebacks; } /*********************/ /* __gnat_initialize */ /*********************/ /* __gnat_initialize is called at the start of execution of an Ada program (the call is generated by the binder). The standard routine does nothing at all; the intention is that this be replaced by system specific code where initialization is required. */ /***********************************/ /* __gnat_initialize (AIX version) */ /***********************************/ #if defined (_AIX) /* AiX doesn't have SA_NODEFER */ #define SA_NODEFER 0 #include /* AiX doesn't have nanosleep, but provides nsleep instead */ int nanosleep (Rqtp, Rmtp) struct timestruc_t *Rqtp, *Rmtp; { return nsleep (Rqtp, Rmtp); } #include static void __gnat_error_handler (sig) int sig; { struct Exception_Data *exception; 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); } static 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_handler = __gnat_error_handler; act.sa_flags = SA_NODEFER | SA_RESTART; (void) sigemptyset (&act.sa_mask); (void) sigaction (SIGILL, &act, NULL); (void) sigaction (SIGABRT, &act, NULL); (void) sigaction (SIGFPE, &act, NULL); (void) sigaction (SIGSEGV, &act, NULL); (void) sigaction (SIGBUS, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /****************************************/ /* __gnat_initialize (Dec Unix version) */ /****************************************/ #elif defined(__alpha__) && defined(__osf__) && ! defined(__alpha_vxworks) /* note: it seems that __alpha__ and __osf__ are both defined for the Alpha VXWorks case. Not clear that this is reasonable, but in any case we have to be sure to exclude this case in the above test */ #include #include #include static void __gnat_error_handler (sig, sip, context) int sig; siginfo_t *sip; struct sigcontext *context; { struct Exception_Data *exception; static int recurse = 0; struct sigcontext *mstate; char *msg; /* If this was an explicit signal from a "kill", just resignal it. */ if (SI_FROMUSER (sip)) { signal (sig, SIG_DFL); kill (getpid(), sig); } /* Otherwise, treat it as something we handle. */ 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 (sip->si_code == SEGV_ACCERR || (((long) sip->si_addr) & 3) != 0 || recurse) { exception = &constraint_error; msg = "SIGSEGV"; } else { /* See if the page before the faulting page is accessable. 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) sip->si_addr & - getpagesize ()))[getpagesize ()]; msg = "stack overflow (or erroneous memory access)"; exception = &storage_error; } 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; mstate = (struct sigcontext *) (*Get_Machine_State_Addr) (); if (mstate != 0) *mstate = *context; Raise_From_Signal_Handler (exception, msg); } static __gnat_install_handler () { 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_ONSTACK | SA_RESTART | SA_NODEFER | SA_SIGINFO; (void) sigemptyset (&act.sa_mask); (void) sigaction (SIGILL, &act, NULL); (void) sigaction (SIGABRT, &act, NULL); (void) sigaction (SIGFPE, &act, NULL); (void) sigaction (SIGSEGV, &act, NULL); (void) sigaction (SIGBUS, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /* Routines called by 5amastop.adb. */ #define SC_GP 29 char * __gnat_get_code_loc (context) struct sigcontext *context; { return (char *) context->sc_pc; } void __gnat_enter_handler (context, pc) struct sigcontext *context; char *pc; { context->sc_pc = (long) pc; context->sc_regs[SC_GP] = exc_lookup_gp (pc); exc_resume (context); } size_t __gnat_machine_state_length () { return sizeof (struct sigcontext); } /***********************************/ /* __gnat_initialize (HPUX version) */ /***********************************/ #elif defined (hpux) #include static void __gnat_error_handler (sig) int sig; { struct Exception_Data *exception; 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); } static 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! 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. */ static char handler_stack [SIGSTKSZ]; stack_t stack; stack.ss_sp = handler_stack; stack.ss_size = SIGSTKSZ; stack.ss_flags = 0; (void) sigaltstack (&stack, NULL); act.sa_handler = __gnat_error_handler; act.sa_flags = SA_NODEFER | SA_RESTART | SA_ONSTACK; (void) sigemptyset (&act.sa_mask); (void) sigaction (SIGILL, &act, NULL); (void) sigaction (SIGABRT, &act, NULL); (void) sigaction (SIGFPE, &act, NULL); (void) sigaction (SIGSEGV, &act, NULL); (void) sigaction (SIGBUS, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /*************************************/ /* __gnat_initialize (Linux version) */ /*************************************/ #elif defined (linux) && defined (i386) && !defined (__RT__) #include #include /* Linux with GNU libc does not define NULL in included header files */ #if !defined (NULL) #define NULL ((void *) 0) #endif struct Machine_State { unsigned long eip; unsigned long ebx; unsigned long esp; unsigned long ebp; unsigned long esi; unsigned long edi; }; static void __gnat_error_handler (int sig) { struct Exception_Data *exception; char *msg; static int recurse = 0; struct sigcontext *info = (struct sigcontext *) (((char *) &sig) + sizeof (int)); /* Linux does not document how to get the machine state in a signal handler, but in fact the necessary data is in a sigcontext_struct value that is on the stack immediately above the signal number parameter, and the above messing accesses this value on the stack. */ struct Machine_State *mstate; 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 (recurse) { exception = &constraint_error; msg = "SIGSEGV"; } else { /* 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 versions of a-init.c before 1.95, we had a test of the page before the stack pointer using: recurse++; ((volatile char *) ((long) info->esp_at_signal & - getpagesize ()))[getpagesize ()]; but that's wrong, since it tests the stack pointer location, and the current stack probe code does not move the stack pointer 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 */ msg = "stack overflow (or erroneous memory access)"; exception = &storage_error; } break; case SIGBUS: exception = &constraint_error; msg = "SIGBUS"; break; case SIGFPE: exception = &constraint_error; msg = "SIGFPE"; break; default: exception = &program_error; msg = "unhandled signal"; } mstate = (*Get_Machine_State_Addr)(); if (mstate) { mstate->eip = info->eip; mstate->ebx = info->ebx; mstate->esp = info->esp_at_signal; mstate->ebp = info->ebp; mstate->esi = info->esi; mstate->edi = info->edi; } recurse = 0; Raise_From_Signal_Handler (exception, msg); } static 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_handler = __gnat_error_handler; act.sa_flags = SA_NODEFER | SA_RESTART; (void) sigemptyset_fake (&act.sa_mask); (void) sigaction_fake (SIGILL, &act, NULL); // (void) sigaction_fake (SIGABRT, &act, NULL); (void) sigaction_fake (SIGFPE, &act, NULL); (void) sigaction_fake (SIGSEGV, &act, NULL); (void) sigaction_fake (SIGBUS, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /******************************************/ /* __gnat_initialize (NT-mingw32 version) */ /******************************************/ #elif defined (__MINGW32__) #include /* __gnat_initialize (mingw32). */ static LONG __gnat_error_handler (info) PEXCEPTION_POINTERS info; { static int recurse; struct Exception_Data *exception; char *msg; switch (info->ExceptionRecord->ExceptionCode) { case EXCEPTION_ACCESS_VIOLATION: /* If the failing address isn't maximally-aligned or if we've recursed, this is a program error. */ if ((info->ExceptionRecord->ExceptionInformation[1] & 3) != 0 || recurse) { exception = &program_error; msg = "EXCEPTION_ACCESS_VIOLATION"; } else { /* See if the page before the faulting page is accessable. Do that by trying to access it. */ recurse++; * ((volatile char *) (info->ExceptionRecord->ExceptionInformation[1] + 4096)); exception = &storage_error; msg = "stack overflow (or erroneous memory access)"; } break; case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: exception = &constraint_error; msg = "EXCEPTION_ARRAY_BOUNDS_EXCEEDED"; break; case EXCEPTION_DATATYPE_MISALIGNMENT: exception = &constraint_error; msg = "EXCEPTION_DATATYPE_MISALIGNMENT"; break; case EXCEPTION_FLT_DENORMAL_OPERAND: exception = &constraint_error; msg = "EXCEPTION_FLT_DENORMAL_OPERAND"; break; case EXCEPTION_FLT_DIVIDE_BY_ZERO: exception = &constraint_error; msg = "EXCEPTION_FLT_DENORMAL_OPERAND"; break; case EXCEPTION_FLT_INVALID_OPERATION: exception = &constraint_error; msg = "EXCEPTION_FLT_INVALID_OPERATION"; break; case EXCEPTION_FLT_OVERFLOW: exception = &constraint_error; msg = "EXCEPTION_FLT_OVERFLOW"; break; case EXCEPTION_FLT_STACK_CHECK: exception = &program_error; msg = "EXCEPTION_FLT_STACK_CHECK"; break; case EXCEPTION_FLT_UNDERFLOW: exception = &constraint_error; msg = "EXCEPTION_FLT_UNDERFLOW"; break; case EXCEPTION_INT_DIVIDE_BY_ZERO: exception = &constraint_error; msg = "EXCEPTION_INT_DIVIDE_BY_ZERO"; break; case EXCEPTION_INT_OVERFLOW: exception = &constraint_error; msg = "EXCEPTION_INT_OVERFLOW"; break; case EXCEPTION_INVALID_DISPOSITION: exception = &program_error; msg = "EXCEPTION_INVALID_DISPOSITION"; break; case EXCEPTION_NONCONTINUABLE_EXCEPTION: exception = &program_error; msg = "EXCEPTION_NONCONTINUABLE_EXCEPTION"; break; case EXCEPTION_PRIV_INSTRUCTION: exception = &program_error; msg = "EXCEPTION_PRIV_INSTRUCTION"; break; case EXCEPTION_SINGLE_STEP: exception = &program_error; msg = "EXCEPTION_SINGLE_STEP"; break; case EXCEPTION_STACK_OVERFLOW: exception = &storage_error; msg = "EXCEPTION_STACK_OVERFLOW"; break; default: exception = &program_error; msg = "unhandled signal"; } recurse = 0; Raise_From_Signal_Handler (exception, msg); } static void __gnat_install_handler () { SetUnhandledExceptionFilter (__gnat_error_handler); } void __gnat_init_float (); void __gnat_initialize () { __gnat_install_handler (); /* Initialize floating-point coprocessor. This call is needed because the MS libraries default to 64-bit precision instead of 80-bit precision, and we require the full precision for proper operation, given that we have set Max_Digits etc with this in mind */ __gnat_init_float (); /* initialize a lock for a process handle list - see a-adaint.c for the implementation of portable_no_block_spawn, portable_wait */ __plist_init(); } /**************************************/ /* __gnat_initialize (OpenNT version) */ /**************************************/ #elif defined (__INTERIX) #include #include #include static void __gnat_error_handler (sig) int sig; { struct Exception_Data *exception; char *msg; switch (sig) { case 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); } static 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_handler = __gnat_error_handler; act.sa_flags = 0; (void) sigemptyset (&act.sa_mask); /* Handlers for signals besides SIGSEGV cause c974013 to hang */ /* (void) sigaction (SIGILL, &act, NULL); */ /* (void) sigaction (SIGABRT, &act, NULL); */ /* (void) sigaction (SIGFPE, &act, NULL); */ (void) sigaction (SIGSEGV, &act, NULL); /* (void) sigaction (SIGBUS, &act, NULL); */ } void __gnat_init_float (); void __gnat_initialize () { __gnat_init_float (); __gnat_install_handler (); } /**************************************/ /* __gnat_initialize (LynxOS version) */ /**************************************/ #elif defined (__Lynx__) void __gnat_init_float (); void __gnat_initialize () { __gnat_init_float (); } /****************************/ /* __gnat_initialize (OS/2) */ /****************************/ #elif defined (__EMX__) /* OS/2 dependent initialization */ void __gnat_init_float (); void __gnat_initialize () { } /***********************************/ /* __gnat_initialize (SGI version) */ /***********************************/ #elif defined (sgi) #include #include #ifndef NULL #define NULL 0 #endif #define SIGADAABORT 48 #define SIGNAL_STACK_SIZE 4096 #define SIGNAL_STACK_ALIGNMENT 64 struct Machine_State { sigcontext_t context; }; static void __gnat_error_handler (sig, code, sc) int sig; int code; sigcontext_t *sc; { struct Machine_State *mstate; struct Exception_Data *exception; char *msg; int i; 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) { /* ??? 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"; } mstate = (*Get_Machine_State_Addr)(); if (mstate != 0) bcopy ((const void *) sc, (void *) mstate, sizeof (sigcontext_t)); Raise_From_Signal_Handler (exception, msg); } static void __gnat_install_handler () { stack_t ss; 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_NODEFER + SA_RESTART; (void) sigfillset (&act.sa_mask); (void) sigemptyset (&act.sa_mask); (void) sigaction (SIGILL, &act, NULL); (void) sigaction (SIGABRT, &act, NULL); (void) sigaction (SIGFPE, &act, NULL); (void) sigaction (SIGSEGV, &act, NULL); (void) sigaction (SIGBUS, &act, NULL); (void) sigaction (SIGADAABORT, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /*************************************************/ /* __gnat_initialize (Solaris and SunOS version) */ /*************************************************/ #elif defined (sun) && defined (__SVR4) && !defined (__vxworks) #include #include static void __gnat_error_handler (sig, sip) int sig; siginfo_t *sip; { struct Exception_Data *exception; static int recurse = 0; char *msg; /* If this was an explicit signal from a "kill", just resignal it. */ if (SI_FROMUSER (sip)) { signal (sig, SIG_DFL); kill (getpid(), sig); } /* Otherwise, treat it as something we handle. */ 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 (sip->si_code == SEGV_ACCERR || (((long) sip->si_addr) & 3) != 0 || recurse) { exception = &constraint_error; msg = "SIGSEGV"; } else { /* See if the page before the faulting page is accessable. 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) sip->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); } static 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_handler = __gnat_error_handler; act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO; (void) sigemptyset (&act.sa_mask); (void) sigaction (SIGILL, &act, NULL); (void) sigaction (SIGABRT, &act, NULL); (void) sigaction (SIGFPE, &act, NULL); (void) sigaction (SIGSEGV, &act, NULL); (void) sigaction (SIGBUS, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /***********************************/ /* __gnat_initialize (SNI version) */ /***********************************/ #elif defined (__sni__) /* SNI needs special defines and includes */ #define _XOPEN_SOURCE #define _POSIX_SOURCE #include #include #include /* The run time needs this function which is a #define in SNI */ size_t __gnat_getpagesize(void) { return getpagesize(); } static void __gnat_error_handler (sig) int sig; { struct Exception_Data *exception; 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); } static 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_handler = __gnat_error_handler; act.sa_flags = SA_NODEFER | SA_RESTART; (void) sigemptyset (&act.sa_mask); (void) sigaction (SIGILL, &act, NULL); (void) sigaction (SIGABRT, &act, NULL); (void) sigaction (SIGFPE, &act, NULL); (void) sigaction (SIGSEGV, &act, NULL); (void) sigaction (SIGBUS, &act, NULL); } void __gnat_initialize () { __gnat_install_handler (); } /***********************************/ /* __gnat_initialize (VMS version) */ /***********************************/ #elif defined (VMS) /* The prehandler actually gets control first on a condition. It swaps the stack pointer and calls the handler (__gnat_error_handler). */ extern long __gnat_error_prehandler (); extern char *__gnat_error_prehandler_stack; /* Alternate signal stack */ /* 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_GCC. */ #ifndef IN_GCC #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 (int); #endif #include /* 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 recoginized by Gnu C. Some, which couldn't be located, are assigned names based on the DEC test suite tests which raise them. */ #define SS$_ACCVIO 12 #define SS$_DEBUG 1132 #define SS$_INTDIV 1156 #define SS$_HPARITH 1284 #define SS$_STKOVF 1364 #define SS$_RESIGNAL 2328 #define MTH$_FLOOVEMAT 1475268 /* Some ACVC_21 CXA tests */ #define SS$_CE24VRU 3253636 /* Write to unopened file */ #define SS$_C980VTE 3246436 /* AST requests time slice */ #define CMA$_EXIT_THREAD 4227492 #define CMA$_EXCCOPLOS 4228108 #define CMA$_ALERTED 4227460 struct descriptor_s {unsigned short len, mbz; char *adr; }; long __gnat_error_handler (sigargs, mechargs) int *sigargs; void *mechargs; { struct Exception_Data *exception = 0; char *msg = ""; char message [256]; long prvhnd; struct descriptor_s msgdesc; int msg_flag = 0x000f; /* 1 bit for each of the four message parts */ unsigned short outlen; /* Resignaled condtions aren't effected by by pragma Import_Exception */ switch (sigargs[1]) { case CMA$_EXIT_THREAD: return SS$_RESIGNAL; case SS$_DEBUG: /* Gdb attach, resignal to merge activate gdbstub. */ return SS$_RESIGNAL; case 1409786: /* Nickerson bug #33 ??? */ return SS$_RESIGNAL; case 1381050: /* Nickerson bug #33 ??? */ return SS$_RESIGNAL; case 11829410: /* Resignalled as Use_Error for CE10VRC */ return SS$_RESIGNAL; } #ifndef IN_GCC /* See if it's an imported exception. Mask off severity bits. */ exception = Coded_Exception (sigargs [1] & 0xfffffff8); if (exception) { msgdesc.len = 256; msgdesc.mbz = 0; msgdesc.adr = message; SYS$GETMSG (sigargs[1], &outlen, &msgdesc, msg_flag, 0); message [outlen] = 0; msg = message; exception->Name_Length = 19; /* The full name really should be get sys$getmsg returns. ??? */ exception->Full_Name = "IMPORTED_EXCEPTION"; exception->Import_Code = sigargs [1] & 0xfffffff8; } #endif if (exception == 0) switch (sigargs[1]) { case SS$_ACCVIO: if (sigargs[3] == 0) { exception = &constraint_error; msg = "access zero"; } else { exception = &storage_error; msg = "stack overflow (or erroneous memory access)"; } break; case SS$_STKOVF: exception = &storage_error; msg = "stack overflow"; break; case SS$_INTDIV: exception = &constraint_error; msg = "division by zero"; break; case SS$_HPARITH: #ifdef IN_GCC return SS$_RESIGNAL; /* toplev.c handles for compiler */ #else { exception = &constraint_error; msg = "arithmetic error"; } #endif break; case MTH$_FLOOVEMAT: exception = &constraint_error; msg = "floating overflow in math library"; break; case SS$_CE24VRU: exception = &constraint_error; msg = ""; break; case SS$_C980VTE: exception = &program_error; msg = ""; break; default: #ifdef IN_GCC exception = &program_error; #else /* User programs expect Non_Ada_Error to be raised, reference DEC Ada test CXCONDHAN. */ exception = &Non_Ada_Error; msgdesc.len = 256; msgdesc.mbz = 0; msgdesc.adr = message; SYS$GETMSG (sigargs[1], &outlen, &msgdesc, msg_flag, 0); message [outlen] = 0; msg = message; #endif break; } Raise_From_Signal_Handler (exception, msg); } static void install_handler () { long prvhnd; char *c; c = (char *) malloc (1025); __gnat_error_prehandler_stack = &c[1024]; /* __gnat_error_prehandler is an assembly function. */ SYS$SETEXV (1, __gnat_error_prehandler, 3, &prvhnd); } void __gnat_initialize() { install_handler(); } /***************************************/ /* __gnat_initialize (VXWorks version) */ /***************************************/ #elif defined(__vxworks) #include #include #include #include #include static void __gnat_int_handler (interr) int interr; { /* * Note that we should use something like Raise_From_Int_Handler here, * but for now Raise_From_Signal_Handler will do the job. ??? */ Raise_From_Signal_Handler (&storage_error, "stack overflow"); } /* Used for stack-checking on VxWorks. Must be task-local in tasking programs */ void *__gnat_stack_limit = NULL; #ifndef __alpha_vxworks /* getpid is used by s-parint.adb, but is not defined by VxWorks, except on Alpha VxWorks */ long getpid (void) { return taskIdSelf (); } #endif /* This is needed by the GNAT run time to handle Vxworks interrupts */ int __gnat_inum_to_ivec (int num) { return INUM_TO_IVEC (num); } static void __gnat_error_handler (sig, code, sc) int sig; int code; struct sigcontext *sc; { struct Exception_Data *exception; sigset_t mask; int result; char *msg; /* * 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. */ (void) sigprocmask (SIG_SETMASK, NULL, &mask); sigdelset (&mask, sig); (void) sigprocmask (SIG_SETMASK, &mask, NULL); /* * VxWorks will suspend the task when it gets a hardware * exception. We take the liberty of resuming the task * for the application. */ if (taskIsSuspended (taskIdSelf ()) != 0) (void) taskResume (taskIdSelf ()); switch (sig) { case SIGFPE: exception = &constraint_error; msg = "SIGFPE"; break; case SIGILL: exception = &constraint_error; msg = "SIGILL"; break; case SIGSEGV: exception = &program_error; msg = "SIGSEGV"; break; case SIGBUS: exception = &program_error; msg = "SIGBUS"; break; default: exception = &program_error; msg = "unhandled signal"; } Raise_From_Signal_Handler (exception, msg); } static void __gnat_install_handler () { 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; (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); } #define HAVE_GNAT_INIT_FLOAT void __gnat_init_float () { #if defined (_ARCH_PPC) && !defined (_SOFT_FLOAT) /* Disable overflow/underflow exceptions on the PPC processor, this is needed to get correct Ada semantic */ asm ("mtfsb0 25"); asm ("mtfsb0 26"); #endif } void __gnat_initialize () { TASK_DESC pTaskDesc; if (taskInfoGet(taskIdSelf(), &pTaskDesc) != OK) { printErr ("Cannot get task info"); } __gnat_stack_limit = (void *) pTaskDesc.td_pStackLimit; __gnat_init_float (); #ifdef __mips_vxworks #if 0 /* For now remove this handler, since it is causing interferences with gdb */ /* * Connect the overflow trap directly to the __gnat_int_handler routine * as it is not converted to a signal by VxWorks. */ intConnect (INUM_TO_IVEC (IV_TRAP_VEC), &__gnat_int_handler, IV_TRAP_VEC); #endif #endif __gnat_install_handler (); } /***************************************/ /* __gnat_initialize (default version) */ /***************************************/ #else /* For all other versions of GNAT, the initialize routine does nothing. */ void __gnat_initialize () { } #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, WIN32 and could be used under OS/2 */ #if defined (_WIN32) || defined (__INTERIX) || defined (__EMX__) \ || defined (__Lynx__) #define HAVE_GNAT_INIT_FLOAT void __gnat_init_float () { #if defined (__i386__) || defined (i386) /* This is used to properly initialize the FPU on an x86 for each process thread. */ asm ("finit"); #endif /* Defined __i386__ */ } #endif /* Get the stack unwinding mechanism when available and when compiling a-init.c for the run time. Except in the case of a restricted run-time, such as RT-Linux modules (__RT__ is defined). */ #if !defined (IN_GCC) && !defined (__RT__) /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that the rest of the DWARF 2 frame unwind support is also provided. */ #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX) #define DWARF2_UNWIND_INFO 1 #endif #ifdef DWARF2_UNWIND_INFO #ifndef _SIZE_T_DEFINED #include #endif #include "frame.h" struct machine_state { frame_state f1, f2, f3; frame_state *udata, *udata_start, *sub_udata; void *pc, *pc_start, *new_pc; }; typedef int word_type __attribute__ ((mode (__word__))); /* This type is used in get_reg and put_reg to deal with ABIs where a void* is smaller than a word, such as the Irix 6 n32 ABI. We cast twice to avoid a warning about casting between int and pointer of different sizes. */ typedef int ptr_type __attribute__ ((mode (pointer))); /* Get the value of register REG as saved in UDATA, where SUB_UDATA is a frame called by UDATA or 0. */ static void* get_reg (unsigned reg, frame_state *udata, frame_state *sub_udata) { if (udata->saved[reg] == REG_SAVED_OFFSET) return (void *)(ptr_type) *(word_type *)(udata->cfa + udata->reg_or_offset[reg]); else if (udata->saved[reg] == REG_SAVED_REG && sub_udata) return get_reg (udata->reg_or_offset[reg], sub_udata, 0); else abort (); } /* Overwrite the saved value for register REG in frame UDATA with VAL. */ static void put_reg (unsigned reg, void *val, frame_state *udata) { if (udata->saved[reg] == REG_SAVED_OFFSET) *(word_type *)(udata->cfa + udata->reg_or_offset[reg]) = (word_type)(ptr_type) val; else abort (); } /* Copy the saved value for register REG from frame UDATA to frame TARGET_UDATA. Unlike the previous two functions, this can handle registers that are not one word large. */ static void copy_reg (unsigned reg, frame_state *udata, frame_state *target_udata) { if (udata->saved[reg] == REG_SAVED_OFFSET && target_udata->saved[reg] == REG_SAVED_OFFSET) memcpy (target_udata->cfa + target_udata->reg_or_offset[reg], udata->cfa + udata->reg_or_offset[reg], __builtin_dwarf_reg_size (reg)); else abort (); } /* Overwrite the return address for frame UDATA with VAL. */ static inline void put_return_addr (void *val, frame_state *udata) { val = __builtin_frob_return_addr (val); put_reg (udata->retaddr_column, val, udata); } #ifdef INCOMING_REGNO /* Is the saved value for register REG in frame UDATA stored in a register window in the previous frame? */ static int in_reg_window (int reg, frame_state *udata) { if (udata->saved[reg] != REG_SAVED_OFFSET) return 0; #ifdef STACK_GROWS_DOWNWARD return udata->reg_or_offset[reg] > 0; #else return udata->reg_or_offset[reg] < 0; #endif } #endif /* INCOMING_REGNO */ /* Retrieve the return address for frame UDATA, where SUB_UDATA is a frame called by UDATA or 0. */ static inline void * get_return_addr (frame_state *udata, frame_state *sub_udata) { return __builtin_extract_return_addr (get_reg (udata->retaddr_column, udata, sub_udata)); } /* Thread-safe version of __frame_state_for */ static struct frame_state * __frame_state_for_r (void *pc_target, struct frame_state *state_in) { struct frame_state *f; (*Lock_Task) (); f = __frame_state_for (pc_target, state_in); (*Unlock_Task) (); return f; } /* Given the current frame UDATA and its return address PC, return the information about the calling frame in CALLER_UDATA. */ void __gnat_pop_frame (m) struct machine_state *m; { frame_state *p; int i; m->pc = m->new_pc; p = m->udata; if (! __frame_state_for_r (m->pc, m->sub_udata)) { m->new_pc = 0; return; } /* Now go back to our caller's stack frame. If our caller's CFA register was saved in our stack frame, restore it; otherwise, assume the CFA register is SP and restore it to our CFA value. */ if (m->udata->saved[m->sub_udata->cfa_reg]) m->sub_udata->cfa = get_reg (m->sub_udata->cfa_reg, m->udata, 0); else m->sub_udata->cfa = m->udata->cfa; m->sub_udata->cfa += m->sub_udata->cfa_offset; m->udata = m->sub_udata; m->sub_udata = p; m->new_pc = get_return_addr (m->udata, m->sub_udata) - 1; return; /* ??? disable this code for now since it doesn't work properly */ #if 0 if (m->pc == m->pc_start) return; /* Copy the frame's saved register values into our register save slots. */ for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) if (i != m->udata->retaddr_column && m->udata->saved[i]) { #ifdef INCOMING_REGNO /* If you modify the saved value of the return address register on the SPARC, you modify the return address for your caller's frame. Don't do that here, as it will confuse get_return_addr. */ if (in_reg_window (i, m->udata) && m->udata->saved[m->udata->retaddr_column] == REG_SAVED_REG && m->udata->reg_or_offset[m->udata->retaddr_column] == i) continue; #endif copy_reg (i, m->udata, m->udata_start); } #endif } void __gnat_set_machine_state (machine_state) struct machine_state *machine_state; { frame_state sub_udata; /* Start at our stack frame. */ label: machine_state->udata = &machine_state->f1; machine_state->sub_udata = &machine_state->f2; machine_state->udata_start = &machine_state->f3; if (! __frame_state_for_r (&&label, machine_state->udata)) return; /* We need to get the value from the CFA register. At this point in compiling libgnat.a we don't know whether or not we will use the frame pointer register for the CFA, so we check our unwind info. */ if (machine_state->udata->cfa_reg == __builtin_dwarf_fp_regnum ()) machine_state->udata->cfa = __builtin_fp (); else machine_state->udata->cfa = __builtin_sp (); machine_state->udata->cfa += machine_state->udata->cfa_offset; memcpy (machine_state->udata_start, machine_state->udata, sizeof (frame_state)); machine_state->new_pc = machine_state->pc_start = machine_state->pc = &&label; /* Do any necessary initialization to access arbitrary stack frames. On the SPARC, this means flushing the register windows. */ __builtin_unwind_init (); /* go up one frame */ __gnat_pop_frame (machine_state); } void __gnat_enter_handler (m, handler) struct machine_state *m; void *handler; { void *retaddr; #ifdef INCOMING_REGNO /* we need to update the saved return address register from the last frame we unwind, or the handler frame will have the wrong return address. */ if (m->udata->saved[m->udata->retaddr_column] == REG_SAVED_REG) { int i = m->udata->reg_or_offset[m->udata->retaddr_column]; if (in_reg_window (i, m->udata)) copy_reg (i, m->udata, m->udata_start); } #endif /* Emit the stub to adjust sp and jump to the handler. */ retaddr = __builtin_eh_stub (); /* And then set our return address to point to the stub. */ if (m->udata_start->saved[m->udata_start->retaddr_column] == REG_SAVED_OFFSET) put_return_addr (retaddr, m->udata_start); else __builtin_set_return_addr_reg (retaddr); /* Set up the registers we use to communicate with the stub. We check STACK_GROWS_DOWNWARD so the stub can use adjust_stack. */ __builtin_set_eh_regs (handler, #ifdef STACK_GROWS_DOWNWARD m->udata->cfa - m->udata_start->cfa #else m->udata_start->cfa - m->udata->cfa #endif + m->udata->args_size); /* Epilogue: restore the handler frame's register values and return to the stub. */ } __SIZE_TYPE__ __gnat_machine_state_length () { return sizeof (struct machine_state); } void * __gnat_get_code_loc (m) struct machine_state *m; { return m->pc; } #endif /* DWARF2_UNWIND_INFO */ #endif /* !IN_GCC && !__RT__ */ #ifndef HAVE_GNAT_INIT_FLOAT /* All targets without a specific __gnat_init_float will use an empty one */ void __gnat_init_float () { } #endif