| 1 | /* Target-dependent code for OpenVMS IA-64. |
| 2 | |
| 3 | Copyright (C) 2012-2020 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 | #include "gdbarch.h" |
| 27 | |
| 28 | #ifdef HAVE_LIBUNWIND_IA64_H |
| 29 | |
| 30 | /* Libunwind callback accessor function to acquire procedure unwind-info. */ |
| 31 | |
| 32 | static int |
| 33 | ia64_vms_find_proc_info_x (unw_addr_space_t as, unw_word_t ip, |
| 34 | unw_proc_info_t *pi, |
| 35 | int need_unwind_info, void *arg) |
| 36 | { |
| 37 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 38 | gdb_byte buf[32]; |
| 39 | const char *annex = core_addr_to_string (ip); |
| 40 | LONGEST res; |
| 41 | CORE_ADDR table_addr; |
| 42 | unsigned int info_len; |
| 43 | |
| 44 | res = target_read (current_top_target (), TARGET_OBJECT_OPENVMS_UIB, |
| 45 | annex + 2, buf, 0, sizeof (buf)); |
| 46 | |
| 47 | if (res != sizeof (buf)) |
| 48 | return -UNW_ENOINFO; |
| 49 | |
| 50 | pi->format = UNW_INFO_FORMAT_REMOTE_TABLE; |
| 51 | pi->start_ip = extract_unsigned_integer (buf + 0, 8, byte_order); |
| 52 | pi->end_ip = extract_unsigned_integer (buf + 8, 8, byte_order); |
| 53 | pi->gp = extract_unsigned_integer (buf + 24, 8, byte_order); |
| 54 | table_addr = extract_unsigned_integer (buf + 16, 8, byte_order); |
| 55 | |
| 56 | if (table_addr == 0) |
| 57 | { |
| 58 | /* No unwind data. */ |
| 59 | pi->unwind_info = NULL; |
| 60 | pi->unwind_info_size = 0; |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | res = target_read_memory (table_addr, buf, 8); |
| 65 | if (res != 0) |
| 66 | return -UNW_ENOINFO; |
| 67 | |
| 68 | /* Check version. */ |
| 69 | if (extract_unsigned_integer (buf + 6, 2, byte_order) != 1) |
| 70 | return -UNW_EBADVERSION; |
| 71 | info_len = extract_unsigned_integer (buf + 0, 4, byte_order); |
| 72 | pi->unwind_info_size = 8 * info_len; |
| 73 | |
| 74 | /* Read info. */ |
| 75 | pi->unwind_info = xmalloc (pi->unwind_info_size); |
| 76 | |
| 77 | res = target_read_memory (table_addr + 8, |
| 78 | (gdb_byte *) pi->unwind_info, pi->unwind_info_size); |
| 79 | if (res != 0) |
| 80 | { |
| 81 | xfree (pi->unwind_info); |
| 82 | pi->unwind_info = NULL; |
| 83 | return -UNW_ENOINFO; |
| 84 | } |
| 85 | |
| 86 | /* FIXME: Handle OSSD (OS Specific Data). This extension to ia64 unwind |
| 87 | information by OpenVMS is currently not handled by libunwind, but |
| 88 | looks to be used only in very specific context, and is not generated by |
| 89 | GCC. */ |
| 90 | |
| 91 | pi->lsda = table_addr + 8 + pi->unwind_info_size; |
| 92 | if (extract_unsigned_integer (buf + 4, 2, byte_order) & 3) |
| 93 | { |
| 94 | pi->lsda += 8; |
| 95 | /* There might be an handler, but this is not used for unwinding. */ |
| 96 | pi->handler = 0; |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* Libunwind callback accessor function for cleanup. */ |
| 103 | |
| 104 | static void |
| 105 | ia64_vms_put_unwind_info (unw_addr_space_t as, |
| 106 | unw_proc_info_t *pip, void *arg) |
| 107 | { |
| 108 | /* Nothing required for now. */ |
| 109 | } |
| 110 | |
| 111 | /* Libunwind callback accessor function to get head of the dynamic |
| 112 | unwind-info registration list. */ |
| 113 | |
| 114 | static int |
| 115 | ia64_vms_get_dyn_info_list (unw_addr_space_t as, |
| 116 | unw_word_t *dilap, void *arg) |
| 117 | { |
| 118 | return -UNW_ENOINFO; |
| 119 | } |
| 120 | |
| 121 | /* Set of libunwind callback acccessor functions. */ |
| 122 | static unw_accessors_t ia64_vms_unw_accessors; |
| 123 | static unw_accessors_t ia64_vms_unw_rse_accessors; |
| 124 | |
| 125 | /* Set of ia64-libunwind-tdep gdb callbacks and data for generic |
| 126 | ia64-libunwind-tdep code to use. */ |
| 127 | static struct libunwind_descr ia64_vms_libunwind_descr; |
| 128 | |
| 129 | #endif /* HAVE_LIBUNWIND_IA64_H */ |
| 130 | |
| 131 | static void |
| 132 | ia64_openvms_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 133 | { |
| 134 | set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| 135 | |
| 136 | #ifdef HAVE_LIBUNWIND_IA64_H |
| 137 | /* Override the default descriptor. */ |
| 138 | ia64_vms_unw_accessors = ia64_unw_accessors; |
| 139 | ia64_vms_unw_accessors.find_proc_info = ia64_vms_find_proc_info_x; |
| 140 | ia64_vms_unw_accessors.put_unwind_info = ia64_vms_put_unwind_info; |
| 141 | ia64_vms_unw_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; |
| 142 | |
| 143 | ia64_vms_unw_rse_accessors = ia64_unw_rse_accessors; |
| 144 | ia64_vms_unw_rse_accessors.find_proc_info = ia64_vms_find_proc_info_x; |
| 145 | ia64_vms_unw_rse_accessors.put_unwind_info = ia64_vms_put_unwind_info; |
| 146 | ia64_vms_unw_rse_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; |
| 147 | |
| 148 | ia64_vms_libunwind_descr = ia64_libunwind_descr; |
| 149 | ia64_vms_libunwind_descr.accessors = &ia64_vms_unw_accessors; |
| 150 | ia64_vms_libunwind_descr.special_accessors = &ia64_vms_unw_rse_accessors; |
| 151 | |
| 152 | libunwind_frame_set_descr (gdbarch, &ia64_vms_libunwind_descr); |
| 153 | #endif |
| 154 | } |
| 155 | |
| 156 | void |
| 157 | _initialize_ia64_vms_tdep (void) |
| 158 | { |
| 159 | gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS, |
| 160 | ia64_openvms_init_abi); |
| 161 | } |