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| 1 /* Target-dependent code for OpenVMS IA-64. |
| 2 |
| 3 Copyright (C) 2012 Free Software Foundation, Inc. |
| 4 |
| 5 This file is part of GDB. |
| 6 |
| 7 This program is free software; you can redistribute it and/or modify |
| 8 it under the terms of the GNU General Public License as published by |
| 9 the Free Software Foundation; either version 3 of the License, or |
| 10 (at your option) any later version. |
| 11 |
| 12 This program is distributed in the hope that it will be useful, |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 GNU General Public License for more details. |
| 16 |
| 17 You should have received a copy of the GNU General Public License |
| 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 |
| 20 #include "defs.h" |
| 21 #include "frame-unwind.h" |
| 22 #include "ia64-tdep.h" |
| 23 #include "osabi.h" |
| 24 #include "gdbtypes.h" |
| 25 #include "gdbcore.h" |
| 26 |
| 27 #ifdef HAVE_LIBUNWIND_IA64_H |
| 28 |
| 29 /* Libunwind callback accessor function to acquire procedure unwind-info. */ |
| 30 |
| 31 static int |
| 32 ia64_vms_find_proc_info_x (unw_addr_space_t as, unw_word_t ip, |
| 33 unw_proc_info_t *pi, |
| 34 int need_unwind_info, void *arg) |
| 35 { |
| 36 enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
| 37 unw_dyn_info_t di; |
| 38 int ret; |
| 39 gdb_byte buf[32]; |
| 40 const char *annex = core_addr_to_string (ip); |
| 41 LONGEST res; |
| 42 CORE_ADDR table_addr; |
| 43 unsigned int info_len; |
| 44 |
| 45 res = target_read (¤t_target, TARGET_OBJECT_OPENVMS_UIB, |
| 46 annex + 2, buf, 0, sizeof (buf)); |
| 47 |
| 48 if (res != sizeof (buf)) |
| 49 return -UNW_ENOINFO; |
| 50 |
| 51 pi->format = UNW_INFO_FORMAT_REMOTE_TABLE; |
| 52 pi->start_ip = extract_unsigned_integer (buf + 0, 8, byte_order); |
| 53 pi->end_ip = extract_unsigned_integer (buf + 8, 8, byte_order); |
| 54 pi->gp = extract_unsigned_integer (buf + 24, 8, byte_order); |
| 55 table_addr = extract_unsigned_integer (buf + 16, 8, byte_order); |
| 56 |
| 57 if (table_addr == 0) |
| 58 { |
| 59 /* No unwind data. */ |
| 60 pi->unwind_info = NULL; |
| 61 pi->unwind_info_size = 0; |
| 62 return 0; |
| 63 } |
| 64 |
| 65 res = target_read_memory (table_addr, buf, 8); |
| 66 if (res != 0) |
| 67 return -UNW_ENOINFO; |
| 68 |
| 69 /* Check version. */ |
| 70 if (extract_unsigned_integer (buf + 6, 2, byte_order) != 1) |
| 71 return -UNW_EBADVERSION; |
| 72 info_len = extract_unsigned_integer (buf + 0, 4, byte_order); |
| 73 pi->unwind_info_size = 8 * info_len; |
| 74 |
| 75 /* Read info. */ |
| 76 pi->unwind_info = xmalloc (pi->unwind_info_size); |
| 77 |
| 78 res = target_read_memory (table_addr + 8, |
| 79 pi->unwind_info, pi->unwind_info_size); |
| 80 if (res != 0) |
| 81 { |
| 82 xfree (pi->unwind_info); |
| 83 pi->unwind_info = NULL; |
| 84 return -UNW_ENOINFO; |
| 85 } |
| 86 |
| 87 /* FIXME: Handle OSSD (OS Specific Data). This extension to ia64 unwind |
| 88 information by OpenVMS is currently not handled by libunwind, but |
| 89 looks to be used only in very specific context, and is not generated by |
| 90 GCC. */ |
| 91 |
| 92 pi->lsda = table_addr + 8 + pi->unwind_info_size; |
| 93 if (extract_unsigned_integer (buf + 4, 2, byte_order) & 3) |
| 94 { |
| 95 pi->lsda += 8; |
| 96 /* There might be an handler, but this is not used for unwinding. */ |
| 97 pi->handler = 0; |
| 98 } |
| 99 |
| 100 return 0; |
| 101 } |
| 102 |
| 103 /* Libunwind callback accessor function for cleanup. */ |
| 104 |
| 105 static void |
| 106 ia64_vms_put_unwind_info (unw_addr_space_t as, |
| 107 unw_proc_info_t *pip, void *arg) |
| 108 { |
| 109 /* Nothing required for now. */ |
| 110 } |
| 111 |
| 112 /* Libunwind callback accessor function to get head of the dynamic |
| 113 unwind-info registration list. */ |
| 114 |
| 115 static int |
| 116 ia64_vms_get_dyn_info_list (unw_addr_space_t as, |
| 117 unw_word_t *dilap, void *arg) |
| 118 { |
| 119 return -UNW_ENOINFO; |
| 120 } |
| 121 |
| 122 /* Set of libunwind callback acccessor functions. */ |
| 123 static unw_accessors_t ia64_vms_unw_accessors; |
| 124 static unw_accessors_t ia64_vms_unw_rse_accessors; |
| 125 |
| 126 /* Set of ia64-libunwind-tdep gdb callbacks and data for generic |
| 127 ia64-libunwind-tdep code to use. */ |
| 128 static struct libunwind_descr ia64_vms_libunwind_descr; |
| 129 |
| 130 #endif /* HAVE_LIBUNWIND_IA64_H */ |
| 131 |
| 132 static void |
| 133 ia64_openvms_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 134 { |
| 135 set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| 136 |
| 137 #ifdef HAVE_LIBUNWIND_IA64_H |
| 138 /* Override the default descriptor. */ |
| 139 ia64_vms_unw_accessors = ia64_unw_accessors; |
| 140 ia64_vms_unw_accessors.find_proc_info = ia64_vms_find_proc_info_x; |
| 141 ia64_vms_unw_accessors.put_unwind_info = ia64_vms_put_unwind_info; |
| 142 ia64_vms_unw_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; |
| 143 |
| 144 ia64_vms_unw_rse_accessors = ia64_unw_rse_accessors; |
| 145 ia64_vms_unw_rse_accessors.find_proc_info = ia64_vms_find_proc_info_x; |
| 146 ia64_vms_unw_rse_accessors.put_unwind_info = ia64_vms_put_unwind_info; |
| 147 ia64_vms_unw_rse_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list
; |
| 148 |
| 149 ia64_vms_libunwind_descr = ia64_libunwind_descr; |
| 150 ia64_vms_libunwind_descr.accessors = &ia64_vms_unw_accessors; |
| 151 ia64_vms_libunwind_descr.special_accessors = &ia64_vms_unw_rse_accessors; |
| 152 |
| 153 libunwind_frame_set_descr (gdbarch, &ia64_vms_libunwind_descr); |
| 154 #endif |
| 155 } |
| 156 |
| 157 /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 158 extern initialize_file_ftype _initialize_ia64_vms_tdep; |
| 159 |
| 160 void |
| 161 _initialize_ia64_vms_tdep (void) |
| 162 { |
| 163 gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS, |
| 164 ia64_openvms_init_abi); |
| 165 } |
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