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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [ia64/] [fde-vms.c] - Rev 414
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/* Copyright (C) 2004, 2009 Free Software Foundation, Inc. Contributed by Douglas B Rupp <rupp@gnat.com> This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* Locate the FDE entry for a given address, using VMS Starlet routines to avoid register/deregister calls at DSO load/unload. */ #include "tconfig.h" #include "tsystem.h" #include "coretypes.h" #include "tm.h" #include <stddef.h> #include <stdlib.h> #include <stdio.h> #include "unwind-ia64.h" #define __int64 long #include <vms/ossddef.h> #ifndef SS$_NORMAL #define SS$_NORMAL 1 #endif typedef struct { unsigned long start_offset; unsigned long end_offset; unsigned long info_offset; unsigned long gp_value; } vms_unw_table_entry; typedef unsigned long long uqword; /* ENTRY is the unwind table entry found for a PC part of call chain we're unwinding through. Return whether we should force the generic unwinder to resort to "fallback" processing. */ static int force_fallback_processing_for (void * pc, vms_unw_table_entry * entry) { static int eh_debug = -1; uqword * unw_info_block = (uqword *)entry->info_offset; uqword header = *unw_info_block; /* We need to force fallback processing in two cases: 1/ The exception dispatch frame, since only our fallback processing knows how to properly unwind through it, and 2/ A bottom of stack frame, since only our fallback processing will ensure we don't try to unwind further past it, which would get us into unknown territory and likely cause a severe crash along the way. The two cases are indicated by non-default values for specific bits in the OS Specific Data (OSSD) General Information block associated with such frames. */ ossddef * ossd; if (eh_debug == -1) { char * EH_DEBUG = getenv ("EH_DEBUG"); eh_debug = EH_DEBUG ? atoi (EH_DEBUG) : 0; } if (eh_debug) { printf ("pc @ 0x%p, block @ 0x%p, header = 0x%016llx\n", pc, unw_info_block, header); printf ("mode = %d, length = %ld, handler = %d\n", (int)UNW_IVMS_MODE (header), UNW_LENGTH (header), UNW_FLAG_EHANDLER (header) || UNW_FLAG_EHANDLER (header)); } /* An OSSD block is there for IVMS_MODE == 3 only. */ if (UNW_IVMS_MODE (header) != 3) return 0; /* The OSSD block is found past the header, unwind descriptor area and condition handler pointer, if any. */ ossd = (ossddef *) /* Beware: uqword pointer arithmetic below. */ (unw_info_block + 1 + UNW_LENGTH (header) + (UNW_FLAG_EHANDLER (header) || UNW_FLAG_EHANDLER (header))); /* "A General Information segment may be omitted if all of its fields would have their default values. If a General Information segment is present, it must be the first in the OSSD area." So ... */ if (eh_debug) printf ("ossd @ 0x%p\n", ossd); if (eh_debug && ossd->ossd$v_type == OSSD$K_GENERAL_INFO) printf ("exc_frame = %d - bot_frame = %d - base_frame = %d\n", ossd->ossd$v_exception_frame, ossd->ossd$v_bottom_of_stack, ossd->ossd$v_base_frame); return ossd->ossd$v_type == OSSD$K_GENERAL_INFO && (ossd->ossd$v_exception_frame || ossd->ossd$v_bottom_of_stack || ossd->ossd$v_base_frame); } /* Return a pointer to the unwind table entry for the function containing PC, 0 if we cannot find an entry or if the one we find calls for fallback processing. */ struct unw_table_entry * _Unwind_FindTableEntry (void *pc, unsigned long *segment_base, unsigned long *gp, struct unw_table_entry *ent) { vms_unw_table_entry vueblock; if (SYS$GET_UNWIND_ENTRY_INFO (pc, &vueblock, 0) != SS$_NORMAL) return 0; /* If there is no unwind information, use fallback. */ if (vueblock.info_offset == 0) return 0; /* If we need to force fallback processing, just pretend there is no entry. */ if (force_fallback_processing_for (pc, &vueblock)) return 0; *segment_base = 0; /* ??? Fixme. ??? */ *gp = vueblock.gp_value; ent->start_offset = vueblock.start_offset; ent->end_offset = vueblock.end_offset; ent->info_offset = vueblock.info_offset; return ent; }
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