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 _initialize_ia64_vms_tdep (); 157 void 158 _initialize_ia64_vms_tdep () 159 { 160 gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS, 161 ia64_openvms_init_abi); 162 } 163