Mercurial > hg > CbC > CbC_gcc

annotate gcc/config/ia64/fde-vms.c @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
parents
children
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rev   line source
55
77e2b8dfacca update it from 4.4.3 to 4.5.0
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1 /* Copyright (C) 2004, 2009 Free Software Foundation, Inc.
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2 Contributed by Douglas B Rupp <rupp@gnat.com>
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* Locate the FDE entry for a given address, using VMS Starlet routines
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26 to avoid register/deregister calls at DSO load/unload. */
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27
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28 #include "tconfig.h"
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29 #include "tsystem.h"
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30 #include "coretypes.h"
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31 #include "tm.h"
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32 #include <stddef.h>
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33 #include <stdlib.h>
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34 #include <stdio.h>
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35 #include "unwind-ia64.h"
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36
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37 #define __int64 long
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38 #include <vms/ossddef.h>
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39 #ifndef SS$_NORMAL
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40 #define SS$_NORMAL 1
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41 #endif
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42
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43 typedef struct
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44 {
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45 unsigned long start_offset;
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46 unsigned long end_offset;
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47 unsigned long info_offset;
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48 unsigned long gp_value;
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49 } vms_unw_table_entry;
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50
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51 typedef unsigned long long uqword;
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52
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53 /* ENTRY is the unwind table entry found for a PC part of call chain we're
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54 unwinding through. Return whether we should force the generic unwinder
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55 to resort to "fallback" processing. */
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56
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57 static int
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58 force_fallback_processing_for (void * pc, vms_unw_table_entry * entry)
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59 {
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60 static int eh_debug = -1;
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61
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62 uqword * unw_info_block = (uqword *)entry->info_offset;
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63 uqword header = *unw_info_block;
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64
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65 /* We need to force fallback processing in two cases:
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66
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67 1/ The exception dispatch frame, since only our fallback
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68 processing knows how to properly unwind through it, and
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69
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70 2/ A bottom of stack frame, since only our fallback processing
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71 will ensure we don't try to unwind further past it, which
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72 would get us into unknown territory and likely cause a severe
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73 crash along the way.
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74
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75 The two cases are indicated by non-default values for specific
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76 bits in the OS Specific Data (OSSD) General Information block
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77 associated with such frames. */
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78
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79 ossddef * ossd;
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80
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81 if (eh_debug == -1)
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82 {
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83 char * EH_DEBUG = getenv ("EH_DEBUG");
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84 eh_debug = EH_DEBUG ? atoi (EH_DEBUG) : 0;
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85 }
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86
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87 if (eh_debug)
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88 {
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89 printf ("pc @ 0x%p, block @ 0x%p, header = 0x%016llx\n",
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90 pc, unw_info_block, header);
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91 printf ("mode = %d, length = %ld, handler = %d\n",
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92 (int)UNW_IVMS_MODE (header), UNW_LENGTH (header),
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93 UNW_FLAG_EHANDLER (header) || UNW_FLAG_EHANDLER (header));
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94 }
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95
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96 /* An OSSD block is there for IVMS_MODE == 3 only. */
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97 if (UNW_IVMS_MODE (header) != 3)
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98 return 0;
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99
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100 /* The OSSD block is found past the header, unwind descriptor area
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101 and condition handler pointer, if any. */
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102 ossd = (ossddef *)
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103 /* Beware: uqword pointer arithmetic below. */
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104 (unw_info_block
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105 + 1
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106 + UNW_LENGTH (header)
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107 + (UNW_FLAG_EHANDLER (header) || UNW_FLAG_EHANDLER (header)));
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108
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109 /* "A General Information segment may be omitted if all of its fields
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110 would have their default values. If a General Information segment
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111 is present, it must be the first in the OSSD area." So ... */
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112
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113 if (eh_debug)
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114 printf ("ossd @ 0x%p\n", ossd);
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115
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116 if (eh_debug && ossd->ossd$v_type == OSSD$K_GENERAL_INFO)
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117 printf ("exc_frame = %d - bot_frame = %d - base_frame = %d\n",
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118 ossd->ossd$v_exception_frame,
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119 ossd->ossd$v_bottom_of_stack,
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120 ossd->ossd$v_base_frame);
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121
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122 return
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
123 ossd->ossd$v_type == OSSD$K_GENERAL_INFO
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
124 && (ossd->ossd$v_exception_frame
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
125 || ossd->ossd$v_bottom_of_stack || ossd->ossd$v_base_frame);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
126 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
127
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
128 /* Return a pointer to the unwind table entry for the function
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 containing PC, 0 if we cannot find an entry or if the one we find
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 calls for fallback processing. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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132 struct unw_table_entry *
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 _Unwind_FindTableEntry (void *pc, unsigned long *segment_base,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 unsigned long *gp, struct unw_table_entry *ent)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 vms_unw_table_entry vueblock;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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138 if (SYS$GET_UNWIND_ENTRY_INFO (pc, &vueblock, 0) != SS$_NORMAL)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 return 0;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 /* If there is no unwind information, use fallback. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 if (vueblock.info_offset == 0)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 return 0;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 /* If we need to force fallback processing, just pretend there is
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 no entry. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 if (force_fallback_processing_for (pc, &vueblock))
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 return 0;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 *segment_base = 0; /* ??? Fixme. ??? */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 *gp = vueblock.gp_value;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 ent->start_offset = vueblock.start_offset;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 ent->end_offset = vueblock.end_offset;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 ent->info_offset = vueblock.info_offset;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 return ent;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 }